Articles de revues : « Buck converter »

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Sundar, T., et S. Sankar. « Modeling and Simulation of Closed Loop Controlled Parallel Cascaded Buck Boost Converter Inverter Based Solar System ». International Journal of Power Electronics and Drive Systems (IJPEDS) 6, n^o 3 (1 septembre 2015) : 648. http://dx.doi.org/10.11591/ijpeds.v6.i3.pp648-656.

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This Work deals with design, modeling and simulation of parallel cascaded buck boost converter inverter based closed loop controlled solar system. Two buck boost converters are cascaded in parallel to reduce the ripple in DC output. The DC from the solar cell is stepped up using boost converter. The output of the boost converter is converted to 50Hz AC using single phase full bridge inverter. The simulation results of open loop and closed loop systems are compared. This paper has presented a simulink model for closed loop controlled solar system. Parallel cascaded buck boost converter is proposed for solar system.

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Sreedhar, Jadapalli, et B. Basavaraja. « Plan and analysis of synchronous buck converter for UPS application ». International Journal of Engineering & ; Technology 7, n^o 1.1 (21 décembre 2017) : 679. http://dx.doi.org/10.14419/ijet.v7i1.1.10827.

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DC-DC converters occupies very significant role in the field of industries or daily life applications. To charge batteries of low voltage connected to uninterrupted power supply (UPS), DC-DC converters are needed. Batteries requires low voltage and the available voltage at the source is to be step-down to the required level of voltage at the point of utility (PoU). While designing DC-DC converters, efficiency and simplicity of the circuit is very much important. Simply for the UPS applications, Buck converter can deliver the voltage at required level which is very simple in operation but the increased losses in diode can be addresses by using a synchronous Buck converter. By using synchronous Buck converter, the diode conduction losses in Buck converter can be minimized, thus improving the efficiency of the converter. In this paper, Synchronous Buck converter is used to charge the batteries of UPS. In this paper Design, modeling of synchronous Buck converter for UPS application was done and its results were obtained by using Matlab/Simulink. A hardware prototype was also developed and the hardware results were also shown.

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Monteiro, Joaquim, V. Fernão Pires, Daniel Foito, Armando Cordeiro, J. Fernando Silva et Sónia Pinto. « A Buck-Boost Converter with Extended Duty-Cycle Range in the Buck Voltage Region for Renewable Energy Sources ». Electronics 12, n^o 3 (24 janvier 2023) : 584. http://dx.doi.org/10.3390/electronics12030584.

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Buck-boost DC–DC converters are useful as DC grid interfaces for renewable energy resources. In the classical buck-boost converter, output voltages smaller than the input voltage (the buck region) are observed for duty cycles between 0 and 0.5. Several recent buck-boost converters have been designed to present higher voltage gains. Nevertheless, those topologies show a reduced duty-cycle range, leading to output voltages in the buck region, and thus require the use of very low duty cycles to achieve the lower range of buck output voltages. In this work, we propose a new buck-boost DC-DC converter that privileges the buck region through the extension of the duty-cycle range, enabling buck operation. In fact, the converter proposed here allows output voltages below the input voltage even with duty cycles higher than 0.6. We present the analysis, design, and testing of the extended buck-boost DC-DC converter. Several tests were conducted to illustrate the characteristics of the extended buck-boost DC-DC converter. Test results were obtained using both simulation software and a laboratory prototype.

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Can, Erol. « A Common Capacitor Hybrid Buck-Boost Converter ». Jordan Journal of Electrical Engineering 9, n^o 1 (2023) : 71. http://dx.doi.org/10.5455/jjee.204-1666615450.

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DC-DC converters are electronic circuit elements that are frequently used to change the direct current (DC) level. This paper presents a hybrid buck-boost converter - with constant modulation index - that can change a DC voltage at two directions compared to the conventional buck-boost DC-DC converters. First, the circuit structure and operation are given. Then, the performance of the proposed converter is tested on resistive and inductive loads, and compared with that of conventional buck-boost converters. The obtained results demonstrate the effectiveness of the proposed converter. They unveil that the proposed converter - compared to the conventional buck-boost converters – produces a higher and flexible rate of conversion without changing the operating ratio of the switches. Moreover, the proposed converter is able to change the voltage on double way on load for a constant operating ratio, while the traditional converters provide a one-way conversion.

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Zomorodi, Hossein, et Erfan Nazari. « Design and Simulation of Synchronous Buck Converter in Comparison with Regular Buck Converter ». International Journal of Robotics and Control Systems 2, n^o 1 (1 février 2022) : 79–86. http://dx.doi.org/10.31763/ijrcs.v2i1.538.

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In a variety of low-power applications, a step-down dc-dc converter is used to reduce the voltage from a higher level. The two types of dc-dc converters are a regular buck and synchronous buck. The synchronous buck utilizes two switches and one diode, whereas the regular buck uses one switch and one diode. Many converters rely on the power components' switching qualities to work. A second MOSFET is required due to the diode's higher conduction losses. Because of the diode's conduction losses, the converter's efficiency may be reduced. The use of a synchronous buck converter improves efficiency by reducing diode losses. The main goal of this study is to compare and contrast these two low-power step-down converters. The simulation in this work was performed using the LTSPICE program.

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Mishra, Debani Prasad, Rudranarayan Senapati et Surender Reddy Salkuti. « Comparison of DC-DC converters for solar power conversion system ». Indonesian Journal of Electrical Engineering and Computer Science 26, n^o 2 (1 mai 2022) : 648. http://dx.doi.org/10.11591/ijeecs.v26.i2.pp648-655.

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This paper covers the comparison between four different DC-DC converters for solar power conversion. The four converters are buck converter, buck-boost converter, boost converter, and noninverting buck-boost converter. An MPPT algorithm is designed to calculate battery voltage, current of PV array, the voltage of PV array, power of PV array, output power. It is observed that the non-inverting buck-boost converter is the finest converter for solar power conversion. The final circuit design has the results of 12.2V battery voltage, 0.31A current of PV array, 34V voltage of PV array, 23mW power of PV panel, and 21.8mW of output power. The efficiency of this system is nearly 95%. All four circuits are simulated in MATLAB/Simulink R2020b.

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Hwu, K. I., et T. J. Peng. « A Novel Buck–Boost Converter Combining KY and Buck Converters ». IEEE Transactions on Power Electronics 27, n^o 5 (mai 2012) : 2236–41. http://dx.doi.org/10.1109/tpel.2011.2182208.

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Begum, Shaik Gousia, Syed Sarfaraz Nawaz et G. Sai Anjaneyulu. « Implementation of Fuzzy Logic Controller for DC–DC step Down Converter ». Regular issue 10, n^o 8 (30 juin 2021) : 109–12. http://dx.doi.org/10.35940/ijitee.h9251.0610821.

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This paper presents the design of a Fuzzy logic controller for a DC-DC step-down converter. Buck converters are step-down regulated converters which convert the DC voltage into a lower level standardized DC voltage. The buck converters are used in solar chargers, battery chargers, quadcopters, industrial and traction motor controllers in automobile industries etc. The major drawback in buck converter is that when input voltage and load change, the output voltage also changes which reduces the overall efficiency of the Buck converter. So here we are using a fuzzy logic controller which responds quickly for perturbations, compared to a linear controllers like P, PI, PID controllers. The Fuzzy logic controllers have become popular in designing control application like washing machine, transmission control, because of their simplicity, low cost and adaptability to complex systems without mathematical modeling So we are implementing a fuzzy logic controller for buck converter which maintains fixed output voltage even when there are fluctuations in supply voltage and load. The fuzzy logic controller for the DC-DC Buck converter is simulated using MATLAB/SIMULINK. The proposed approach is implemented on DC-DC step down converter for an input of 230V and we get the desired output for variations in load or references. This proposed system increases the overall efficiency of the buck converter.

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Upendar, Jalla, Sangem Ravi Kumar, Sapavath Sreenu et Bogimi Sirisha. « Implementation and study of fuzzy based KY boost converter for electric vehicle charging ». International Journal of Applied Power Engineering (IJAPE) 11, n^o 1 (1 mars 2022) : 98. http://dx.doi.org/10.11591/ijape.v11.i1.pp98-108.

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Elecetric vehicle batteries require direct current (DC) current for charging; hence the circuit alternating current (AC) is converted to DC by a battery charger. Battery charger mostly consists of a rectifier and DC-DC converter with a controller built in to serve as a protective circuit. A harmonic source load is a type of electric car charger. During the AC-DC change over method, harmonic current is introduced into the power system, affecting power quality. In this study, a charging station consisting of buck boost and a charging station consisting a KY Boost converter were simulated. To maintain output voltage of DC-DC converters constant controller is used, the controller is either PI or fuzzy logic controller. So, four models are developed and simulated which are buck-boost converter controlled by proportional-integral (PI)-controller, KY-boost converter controlled by proportional integral-controller, buck boost converter controller fuzzy logic controller and KY boost-converter controlled by fuzzy logic controller. The total harmonic distortion (THD) of the four models is compared.

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Cho, Younghoon, et Paul Jang. « Analysis and Design for Output Voltage Regulation in Constant-on-Time-Controlled Fly-Buck Converter ». Electronics 10, n^o 16 (6 août 2021) : 1886. http://dx.doi.org/10.3390/electronics10161886.

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Fly-buck converter is a multi-output converter with the structure of a synchronous buck converter structure on the primary side and a flyback converter structure on the secondary side, and can be utilized in various applications due to its many advantages. In terms of control, the primary side of the fly-buck converter has the same structure as a synchronous buck converter, allowing the constant-on-time (COT) control to be applied to the fly-buck converter. However, due to the inherent energy transfer principle, the primary-side output voltage regulation of COT controlled fly-buck converters may be poor, which can deteriorate the overall converter performance. Therefore, the primary output capacitor must be carefully designed to improve the voltage regulation characteristics. In this paper, a theoretical analysis of the output voltage regulation in COT controlled fly-buck converter is conducted, and based on this, a design guideline for the primary output capacitor considering the output voltage regulation is presented. The validity of the analysis and design guidelines was verified using a 5 W prototype of the COT controlled fly-buck converter for telecommunication auxiliary power supply.

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Gürel, Seyfettin, et Sezai Alper Tekin. « Bulk Switched DC-DC Buck Converter ». Energy, Environment and Storage 2, n^o 2 (17 mai 2022) : 31–40. http://dx.doi.org/10.52924/bcmq4493.

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This paper presents a buck converter which has an high efficient and low power consumption for low power applications. The proposed topology is based on buck converter using switching MOSFET with bulk-terminal. The suitable bulk-terminal switching voltage is selected by analyzing the effect of bulk voltage on a MOSFET performance. It is concluded that the bulk-switched DC-DC buck converter structure has the advantages such as high switching performance, low power consumption and high efficiency compared to conventional DC-DC converter circuits. The efficiency value has obtained 88.2%. The proposed circuit is approved experimentally and simultaneously

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C K, Suman. « Design Optimization of Synchronous Buck Converter (SBC) ». International Journal for Research in Applied Science and Engineering Technology 10, n^o 9 (30 septembre 2022) : 24–31. http://dx.doi.org/10.22214/ijraset.2022.46562.

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Abstract: Nowadays Switched-mode power converters are playing a significant role in the industries by providing higher efficiency for various applications. There are various applications that implement power supply and battery charge circuits for devices like smartphones, TVs, and various electronic devices When it comes to DC-DC Converters the most popular among the industries are buck converters and the efficient version of the buck converter is the Synchronous buck converter. The SBC steps down the voltage from higher to lower levels. Efficiency is a crucial parameter as the industry’s focus is on delivering greater performance devices. The power converter's design must be optimized to maximize performance to achieve customer expectations. As a result, a thorough understanding of the synchronous buck converter and how to properly select the circuit components is critical. The proposed work aims at optimizing the Synchronous Buck Converter components such as Inductors, Capacitors, and Resistors. The idea of this optimization study is to improve the performance of the converter and reduce power losses and cost-cutting. In this paper, the control mode considered is peak current mode control.

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Kiran, Nagulapati. « Sliding Mode Control of Buck Converter ». Bulletin of Electrical Engineering and Informatics 3, n^o 1 (1 mars 2014) : 37–44. http://dx.doi.org/10.11591/eei.v3i1.183.

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DC-DC converters are used to convert DC voltage from one level to other. These converters are drastically used in industry as well as in research. One of the main limitations of these converters is unregulated supply of voltage and current. To overcome these problems there are various control techniques. This paper presents two such methods. This paper compares dynamic performance of buck Converter using PID controller and Sliding mode controller. Simulation of PI and Sliding mode control of Buck Converter is carried out in MATLAB SIMULINK.

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Jamshidpour, Ehsan, Slavisa Jovanovic et Philippe Poure. « Equivalent Two Switches and Single Switch Buck/Buck-Boost Circuits for Solar Energy Harvesting Systems ». Energies 13, n^o 3 (27 janvier 2020) : 583. http://dx.doi.org/10.3390/en13030583.

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In this paper, a comparative analysis has been presented of two equivalent circuits of non-isolated buck/buck-boost converters under synchronous control, used in a stand-alone Photovoltaic-battery-load system. The first circuit consists of two cascaded buck and buck-boost classical converters with two controllable switches. The buck converter is used to extract the maximum power of the Photovoltaic source, and the buck-boost converter is applied for the output voltage level control. The second circuit consists of a proposed converter with a single controllable switch. In both cases, the switching frequency is used to track the maximum power point and the duty ratio controls the output voltage level. Selected simulation results and experimental tests confirm that the two conversion circuits have identical behavior under synchronous control. This study shows that the single switch converter has a lower size and cost, but it is limited in the possible control strategy.

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Bonab, Hossein Ajdar Faeghi, et Mohamad Reza Banaei. « Enhanced Buck-Boost dc–dc Converter with Positive Output Voltage ». Journal of Circuits, Systems and Computers 29, n^o 05 (10 juillet 2019) : 2050072. http://dx.doi.org/10.1142/s0218126620500723.

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In this paper, a new transformerless buck-boost converter is presented. The voltage gain of the converter is higher than the classic boost converter, classic buck-boost converter, CUK and SEPIC converters. The proposed converter advantage is buck-boost capability. The proposed converter topology is simple; therefore, the converter control is simple. The converter has one main switch. Hence, the switch with low switching and conduction losses can be used. The stress of the main switch is low; therefore, switch with low on-state resistance can be selected. The principles of the converter and mathematic analyses are presented. The validity of the accuracy of calculations is verified by the experimental results.

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Dwivedi, Dewang, Arun Kumar Maurya, Ayush Gangwar, Anas Ahmad, Ayush Pratap Maury et Hemant Ahuja. « Performance analysis of solar PV system for different converter configurations ». Journal of Physics : Conference Series 2570, n^o 1 (1 août 2023) : 012009. http://dx.doi.org/10.1088/1742-6596/2570/1/012009.

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Abstract In present scenario power electronic converters are of great usage. Almost every electronic industry uses converters in one way or the other. If the converters are integrated with solar PV system, then their various parameters could be thoroughly studied and the most suitable converter could be chosen on the results obtained asper the performance parameters. This research work presents the thorough analysis of a PV system under different converter configurations. Mainly 6 converters are used in this entire research work Buck converter (Step down chopper), Boost converter (Step up chopper), Buck-Boost converter, Split-pi converter, Flyback converter and Linear voltage regulator. Simulations were done on MATLAB/Simulink and on the basis of it results were obtained graphically.

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Manohar Reddy, Ram, Shaik Hussain Vali, Phanindra Thota et Kamaraju V. Kamaraju. « Modelling And Analysis Of Pvsc Type Buck Buck-Boost Dc-Dc Converter ». International Conference on Information Science and Technology Innovation (ICoSTEC) 1, n^o 1 (26 février 2022) : 77–82. http://dx.doi.org/10.35842/icostec.v1i1.23.

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In the era of modern industrial development, power electronics equipment has been developed aggressively and brought dc system again in power utilization to use clean energy resources like solar array, fuel cell, wind generator, etc. Since the past decade, power electronics equipment has become very popular; hence, the switch-mode converter requirement is increasing rapidly day by day in applications like communication power supply, space crafts, hybrid electric vehicles, micro-grid and nano-grids. Among the various available configurations of converters, Multi-Input DC/DC converters became more and more popular in power electronics field, especially, for provide interface of various renewable energy sources and deliver regulated power to several loads. In this article, a PVSC type Buck Buck-Boost Dual-Input DC- DC Converter (DIDC) is designed and modelled for DC grid application. The proposed converter is driven with two renewable energy sources PV cell and a battery having different amplitudes which can able to deliver the power from source to load individually or simultaneously. DIDC tropology is simply configured with two passive elements L, C, diodes D1 D2 and switches S1 , S2. The Dual-Input DC-DC Converter suitability is validated by carrying out simulations in different modes of operation. The de-centralized PID controller is designed for voltage and current loop controller to ensure the DC output voltage of 48 V, load current of 4.8 A and power of 230W. The Stability of the closed-loop converter is also verified under all possible source and load disturbance conditions. The simulations and analysis of the proposed converter are carried out using MATLAB and PSIM software.

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Cipriano dos Santos Júnior, Euzeli. « Dual-output DC-DC buck converter ». Eletrônica de Potência 17, n^o 1 (1 février 2012) : 474–82. http://dx.doi.org/10.18618/rep.2012.1.474482.

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Naik, Jeevan. « Design and Control for the Buck-Boost Converter Combining 1-Plus-D Converter and Synchronous Rectified Buck Converters ». International Journal of Power Electronics and Drive Systems (IJPEDS) 6, n^o 2 (1 juin 2015) : 305. http://dx.doi.org/10.11591/ijpeds.v6.i2.pp305-317.

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In this paper, a design and control for the buck-boost converter, i.e., 1-plus-D converter with a positive output voltage, is presented, which combines the 1-plus-D converter and the synchronous rectified (SR) buck converter. By doing so, the problem in voltage bucking of the 1-plus-D converter can be solved, thereby increasing the application capability of the 1-plus-D converter. Since such a converter operates in continuous conduction mode inherently, it possesses the nonpulsating output current, thereby not only decreasing the current stress on the output capacitor but also reducing the output voltage ripple. Above all, both the 1-plus-D converter and the SR buck converter, combined into a buck–boost converter with no right-half plane zero, use the same power switches, thereby causing the required circuit to be compact and the corresponding cost to be down. Furthermore, during the magnetization period, the input voltage of the 1-plus-D converter comes from the input voltage source, whereas during the demagnetization period, the input voltage of the 1-plus-D converter comes from the output voltage of the SR buck converter.

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Suryadi, Aris, Purwandito Tulus Asmoro et Agus Sofwan. « Design and Simulation Converter with Buck-boost Converter as The Voltage Stabilizer ». International Journal of Electrical, Energy and Power System Engineering 3, n^o 3 (12 octobre 2020) : 77–81. http://dx.doi.org/10.31258/ijeepse.3.3.77-81.

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Buck-boost Converter is the device with the function to convert DC Voltage input to the setpoint DC Voltage output. Buck-boost converter can be used for regulating unstable voltage became a stable voltage by the user’s needs. Using a Buck-boost Converter in the research is about how to apply a Buck-boost Converter of the AC to AC Converter device, AC to AC Converter is the device to convert AC voltage to AC Voltage where the voltage can be modified. In the research, the input Voltage of AC to AC Converter is unstable, so that the output Voltage is unstable too in the range of 190 V to 250 V. To solve this problem, that the Buck-boost can be installed to AC to AC Converter, it is useful to keep output Voltage stable even though the input Voltage is unstable. The AC to AC Converter device in this research consist of Rectifier, Buck-boost Converter, and Inverter. The experiment result of this research show that unstable AC input Voltage, 190 V to 250 V from the source after passing a Rectifier, became an unstable DC input Voltage, then be regulated by Buck-boost Converter became a stable DC Voltage, and then after passing the Inverter, a stable DC Voltage is converted became a stable AC Voltage, corresponding with the set point. For further development, AC to AC Converter combined with Buck-boost Converter can be applied to maintain a standard of Voltage 220 V AC from the sources to keep it stable.

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Cheng, Hung-Liang, Lain-Chyr Hwang, Heidi H. Chang, Qi-You Wang et Chun-An Cheng. « High-Efficiency Flicker-Free LED Driver with Soft-Switching Feature ». Micromachines 13, n^o 5 (20 mai 2022) : 797. http://dx.doi.org/10.3390/mi13050797.

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A novel interleaved DC-DC buck converter is proposed to drive high-brightness light-emitting diodes (LEDs). The circuit configuration mainly consists of two buck converters, which are connected in parallel and use interleaved operation. Through interleaved operation, the power capability of the converter is doubled. Traditionally, two individual inductors are used in the two buck converters. The difference between conventional parallel-operated buck converters using two energy storage inductors and the proposed circuit is that the proposed circuit uses two small inductors and a coupled inductor that replace the two inductors of the buck converters. In this way, both buck converters can be designed to operate in discontinuous-current mode (DCM), even if the magnetizing inductance of the coupled inductor is large. Therefore, the freewheeling diodes can achieve zero-current switching off (ZCS). Applying the principle of conservation of magnetic flux, the magnetizing current is converted between the two windings of the coupled inductor. Because nearly constant magnetizing current continuously flows into the output, the output voltage ripple can be effectively reduced without the use of large-value electrolytic capacitors. In addition, each winding current can drop from positive to negative, and this reverse current can discharge the parasitic capacitor of the active switch to zero volts. In this way, the active switches can operate at zero-voltage switching on (ZVS), leading to low switching losses. A 180 W prototype LED driver was built and tested. Our experimental results show satisfactory performance.

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Ganesen, Anand Bannet, Nungky Prameswari, Falah Kharisma Nuraziz, Arwindra Rizqiawan et Pekik Argo Dahono. « Simplified cascade multiphase DC-DC buck power converter for low voltage large current applications : part I --- steady-state analysis ». International Journal of Power Electronics and Drive Systems (IJPEDS) 12, n^o 3 (1 septembre 2021) : 1708. http://dx.doi.org/10.11591/ijpeds.v12.i3.pp1708-1719.

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This paper presents a new simplified cascade multiphase DC-DC buck power converter suitable for low voltage and large current applications. Cascade connection enables very low voltage ratio without using very small duty cycles nor transformers. Large current with very low ripple content is achieved by using the multiphase technique. The proposed converter needs smaller number of components compared to conventional cascade multiphase DC-DC buck power converters. This paper also presents useful analysis of the proposed DC-DC buck power converter with a method to optimize the phase and cascade number. Simulation and experimental results are included to verify the basic performance of the proposed DC-DC buck power converter.

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Xie, Lingling, Jiahao Shi, Junyi Yao et Di Wan. « Research on the Period-Doubling Bifurcation of Fractional-Order DCM Buck–Boost Converter Based on Predictor-Corrector Algorithm ». Mathematics 10, n^o 12 (9 juin 2022) : 1993. http://dx.doi.org/10.3390/math10121993.

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DC–DC converters are widely used. They are a typical class of strongly nonlinear time-varying systems that show rich nonlinear phenomena under certain working conditions. Therefore, an in-depth study of their nonlinear phenomena, characteristics, and generation mechanism is of great practical significance for gaining a deep understanding of this kind of switching converter, revealing the essence of these nonlinear phenomena and then optimizing the design of this kind of converter. Based on the fact that most of the inductance and capacitance are fractional-order, the nonlinear dynamic characteristics of the fractional-order (FO) DCM buck–boost converter are researched in this paper. The main research work and achievements of this paper include: (1) using the predictor–corrector method of fractional calculus, which is not limited by fractional order and can directly calculate the accurate values of the inductance current and capacitor voltage of the fractional converter; the predictor–corrector model of the FO converter is established. (2) The bifurcation diagrams are obtained based on this model, and the period-doubling bifurcation and chaotic behavior of the FO buck–boost converter are analyzed. (3) The phase diagrams are obtained and verified to the point that period-doubling bifurcation occurs; then, some conclusions are drawn. The results show that under certain operating and parameters conditions, the FO buck–boost converter will appear as a bifurcation and chaotic nonlinear phenomenon. Under the condition of the same circuit parameters, the stability parameter domains of the integer-order buck–boost converter and the FO buck–boost converter are different. Compared with the integer-order converter, the parameter stability region of the FO buck–boost converter is bigger. The FO buck–boost converter is more accurate at describing the nonlinear dynamic characteristics. Furthermore, the predictor–corrector method can also be applied to other FO power converters and provides theoretical guidance for converter parameter optimization and controller design.

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Himmelstoss, Felix A. « Third Order Converters with Current Output for Driving LEDs ». WSEAS TRANSACTIONS ON POWER SYSTEMS 17 (31 décembre 2022) : 402–9. http://dx.doi.org/10.37394/232016.2022.17.40.

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Light emitting diodes LEDs are highly efficient in changing electrical energy into light. The applications are lightning, but also medical treatments, and disinfection. After a short discussion of the simplest converter which is based on the Buck converter several third order current converters, which are suitable to drive an LED load, are treated. The Buck converter with input filter, the output current Boost converter, and the output current Cuk converter are shortly treated, but for the other topologies simple control techniques are given. These converters are the current output converter based on the Zeta converter, two converters with a quadratic term of the duty cycle in the voltage transformation ratio, the quadratic step-down converter with current output and the D square divided by one minus d current output converter, which is a step-up-down converter, and two converters which function only for a limited duty cycle, the (2d-1)/d step-down and the (2d- 1)/(1-d) step-up-down output current converters. The dynamics of example converters is shown with the help of LTSpice simulations.

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Palanisamy, R., K. Vijayakumar, V. Venkatachalam, R. Mano Narayanan, D. Saravanakumar et K. Saravanan. « Simulation of various DC-DC converters for photovoltaic system ». International Journal of Electrical and Computer Engineering (IJECE) 9, n^o 2 (1 avril 2019) : 917. http://dx.doi.org/10.11591/ijece.v9i2.pp917-925.

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This work explains the comparison of various dc-dc converters for photovoltaic systems. In recent day insufficient energy and continues increasing in fuel cost, exploration on renewable energy system becomes more essential. For high and medium power applications, high input source from renewable systems like photovoltaic and wind energy system turn into difficult one, which leads to increase of cost for installation process. So the generated voltage from PV system is boosted with help various boost converter depends on the applications. Here the various converters are like boost converter, buck converter, buck-boost converter, cuk converter, sepic converter and zeta converter are analysed for photovoltaic system, which are verified using matlab / simulink.

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Matalata, Hendi, et Leily W. Johar. « ANALISA BUCK CONVERTER DAN BOOST CONVERTER PADA PERUBAHAN DUTY CYCLE PWM DENGAN MEMBANDINGKAN FREKUENSI PWM 1,7 Khz DAN 3,3 Khz ». Jurnal Ilmiah Universitas Batanghari Jambi 18, n^o 1 (14 février 2018) : 42. http://dx.doi.org/10.33087/jiubj.v18i1.431.

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Buck-Boost Converters are electric power supply device for raising and lowering the voltage DC (Direct Current) power supply equipment according to needs of the electrical load, this research is designed to Buck-Boost Converter and Converter on the 12 Volt power supply, the design of a Buck Converter power supply derived 5 Volt, 6Volt and 6 Volt design while the Boost Converter power supply 12 Volt offered up to 16 Volt, 19 Volt and 22 Volts in a way set the duty cycle of PWM frequency settings in 1.7 Khz and 3.3 Khz. Results research indicates the State of the differences in each frequency in the set output voltage ripple shape obtained is different, however, in the design of this research have been successfully carried out as expected.Keywords: buck converter, boost converter, change in duty cycle

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Kircher, Daniel, et David Johannes Pommerenke. « EMC Analysis of the Inverting Boost/Buck Converter Topology ». Electronics 11, n^o 20 (19 octobre 2022) : 3388. http://dx.doi.org/10.3390/electronics11203388.

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This paper describes the electromagnetic compatibility (EMC) analysis of an inverting buck/boost converter. The inverting buck/boost converter differs from other DC/DC converters, such as the noninverting boost or buck converters, in that one inductor terminal is connected to the ground and not to the input or output of the converter, i.e., neither input nor output is isolated from an EMC perspective. A SPICE model was developed for analyzing the EMC properties of the circuit. Two electromagnetic interference EMI-relevant resonances were observed depending on the state of the switch. Simulations are confirmed with measurements using a circuit designed from discrete components. Further, integrated commercially available converters were analyzed and showed EMC properties that were similar to those of the general model.

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Tseng, Sheng Yu, et Yi Ren Juang. « Approach to Developing Interleaved Converter with Single-Capacitor Turn-Off Snubber ». Applied Mechanics and Materials 284-287 (janvier 2013) : 2477–84. http://dx.doi.org/10.4028/www.scientific.net/amm.284-287.2477.

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This paper presents a systematic approach to developing turn-off snubber for an interleaving converter to smooth out switch turn-off transition. With the approach, the interleaving converter with two turn-off snubbers, which are formed by two L-C-D type snubbers, can be replaced by the one with turn-off snubber composed of a single-capacitor snubber. It can be used in the basic six interleaved converters, such as buck, boost, buck-boost, ‘cuk, zeta and sepic converters. In this research, the structure of the interleaved converter with the turn-off snubber can be conveniently simplified from the derived general configurations, reducing the complexity of circuit structure significantly. Measured results from a buck prototype converter have been verified to prove the feasibility of the derived turn-off snubber.

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Li, Zhaohan, Yongcheng Ji, Shu Yang et Yuchun Chang. « A Dual-Mode High-Voltage High-Efficiency Peak-Current-Mode Asynchronous Buck Converter ». Journal of Circuits, Systems and Computers 25, n^o 11 (14 août 2016) : 1650136. http://dx.doi.org/10.1142/s021812661650136x.

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This paper proposes a high-voltage high-efficiency peak-current-mode asynchronous DC–DC step-down converter operating with dual operation modes. The asynchronous buck converter achieves higher efficiency in light load condition compared to synchronous buck converters. Furthermore, the proposed buck converter switches operation mode automatically from pulse-width modulation (PWM) mode to pulse-skipping mode (PSM). By reducing power MOS on-state resistance and optimizing rise/fall time of switches, the proposed buck converter also obtains high efficiency under heavy load condition. The maximum efficiency of the proposed buck converter is 92.9%, implemented with 0.35[Formula: see text][Formula: see text]m BCDMOS 2P3M process, and the total size is 1.1[Formula: see text] 1.2[Formula: see text]mm2. The input range and output range of the converter are 6–30 V, and ([Formula: see text]–3) V, respectively, with the maximum output current of 3 A. Moreover, its built-in current loop leads to good transient response characteristics. Therefore, it can be used widely in communication system and 12 V/24 V distributed power system.

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Pikulin, Dmitry. « Nonlinear Dynamics of Buck Converter ». Environment. Technology. Resources. Proceedings of the International Scientific and Practical Conference 2 (5 août 2015) : 156. http://dx.doi.org/10.17770/etr2011vol2.997.

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This paper is concerned with the problem of modeling and simulation of piecewise linear systems with the pulse width modulation control. Models of this kind of systems are widely used in engineering practice, in particular in power electronic converters. The research provides the study of chaos and bifurcations in one of the switching converters – step-down converter under voltage mode control, operating in discontinuous and continuous current modes, using Matlab and Simulink simulation environment. Various types of models, including discrete – time maps, switched state – space models are examined in order to detect their suitability and reliability in numerical investigation of nonlinear phenomena in DC–DC converters. Some analytical methods for the search of periodic regimes and their stability estimation were also used in order to validate numerically obtained results and evaluate the accuracy of models used. As direct simulation does not accurately pinpoint bifurcation points and computes only stable invariant sets, some aspects and advantages of numerical path-following are also discussed.

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Do, Hyun Lark. « Interleaved Synchronous Buck Converter with a Coupled Inductor ». Advanced Materials Research 424-425 (janvier 2012) : 793–95. http://dx.doi.org/10.4028/www.scientific.net/amr.424-425.793.

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An interleaved synchronous buck converter with a coupled inductor is proposed in this paper. In the proposed converter, two synchronous buck converters operate with the interleaving technique. Moreover, a single magnetic component is utilized. By using a loosely coupled inductor, its leakage inductances are utilized to control the power flow. Theoretical analysis and performance of the proposed converter were verified on an experimental prototype operating at 100 kHz switching frequency

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Elfani, Nisrina Zahra, et Priyo Sasmoko. « POWER BANK PORTABLE SOLAR CHARGER MENGGUNAKAN SISTEM BUCK-BOOST CONVERTER BERBASIS MIKROKONTROLER ATMEGA 32 ». Gema Teknologi 18, n^o 4 (30 avril 2016) : 15. http://dx.doi.org/10.14710/gt.v18i4.21911.

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Nisrina Zahra Elfani, Priyo Sasmoko explain that portable electronic devices have a problem, namely the resistance of electrical energy intake, because these electronic devices get energy from batteries that have limited capacity to store electrical energy. Electronic objects that have now mushroomed and become primary needs such as cellphones and laptops desperately need a tool to recharge batteries. Solar energy can be used to recharge the gatget batteries by converting them to electric power. This will be very useful for those who are field workers, travelers, and nature lovers who need battery charging devices without having to use an adapter that uses an AC source from PLN grids in homes, while in certain circumstances gadget users may not be at home or in a place that provides ac resources. One solution to this problem is the use of a power bank portbale solar charger. Portable power bank solar charger is a charger that is equipped with backup batteries and solar cells as a source of electrical energy. Realized a portable charger that uses the working principles of DC-DC converter circuits such as: buck-boost converter, buck converetr and boost converter as a voltage regulator that is used to charge electronic devices. The ADC channel on the microcontroller is used as feedback for the controller that is also present in the microcontroller used so that the converter output can be maintained at a certain value through setting the duty cyle PWM that drives the converter. This portable power bank solar charger uses a buck-boost converter system and can produce the desired voltage. Buck converters can reduce the output voltage from 5 Volt dc for the use of chargering handphone and boost converter can increase the output voltage around 19 volts dc for the use of notebook charging Keywords: powerbank, portable charger, buck-boost converter, solar cellReferencesGunawan. 2009. Rancang Bangun DC-Dc Converter dengan PID Diskrit sebagai Pengendali Tegangan Keluaran. Skripsi. Depok : Fakultas Teknik, Program Studi Elektro, Universitas Indonesia. Handini, Wulandari. 2008. Performa Sel Surya Tersensitasi Zat Pewarna (DSSC) Berbasis ZnO dengan Variasi Pengisian dan Besar Kristalis Ti . Skripsi. Depok : Fakultas Teknik, Program Studi Elektro, Universitas Indonesia.Hidayat, Suryo, Muhamad. 2010. Rancang Bangun buck Boost Konverter. Skripsi. Depok : Fakultas Teknik, Program Studi Elektro, Universitas Indonesia

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Rao, Rajaboyana Narendra, Meda Sreenivasulu et Busharaju Ramakrishna. « Voltage regulation of DC micro grid system using PV and battery coupled SEPIC converter ». International Journal of Power Electronics and Drive Systems (IJPEDS) 14, n^o 1 (1 mars 2023) : 41. http://dx.doi.org/10.11591/ijpeds.v14.i1.pp41-50.

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This paper deals with the voltage regulation of DC micro grid system using photovoltaic and battery coupled single-ended primary-inductor converter (SEPIC) converter. SEPIC converter is a DC-to-DC boost converter, it can produce non pulsating DC current with less ripples when compared to buck and buck boost converters. Non pulsating DC current is the demanding condition required in maximum power point tracking (MPPT) applications and battery charging. This paper presents the simulation of the converters for both open and closed loop systems. Firstly, the proposed PV coupled SEPIC converter and the battery coupled buck boost converters are integrated to regulate the voltage in micro grid, and it is compared with the conventional methods in terms of output voltage, ripple voltage and power. The ripple voltage has been reduced to 0.1 V from 0.3 V in the proposed method. Secondly, PI and PID controllers are employed individually to SEPIC and buck boost converter for the voltage regulation of the DC micro grid system. The performance of the closed loop analysis is done in terms of time domain specifications, and it reveals that PID controller has the better response. The proposed system is simulated using MATLAB/Simulink and the prototype has been developed to verify the simulated results.

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Himmelstoss, Felix A., et Karl Edelmoser. « Modified Fourth-Order Buck-Boost Converter ». WSEAS TRANSACTIONS ON ELECTRONICS 11 (18 mai 2020) : 33–41. http://dx.doi.org/10.37394/232017.2020.11.5.

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Some hundred DC/DC converters have been constructed. Here a modified one is investigated. The modification consists in the position of the output capacitor. This does not change the voltage transformation ratio, but leads to constant input current compared to a pulsating one in the original topology. The function of the converter is investigated by inspection and by constructing the signals, the large and small signal model of the converter and the transfer function are derived, dimensioning hints are given and simulations are shown.

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Babazadeh, Yaser, Mehran Sabahi, Ebrahim Babaei et Sun Kai. « A New Continuous Input Current Nonisolated Bidirectional Interleaved Buck-Boost DC-DC Converter ». International Transactions on Electrical Energy Systems 2022 (1 juin 2022) : 1–19. http://dx.doi.org/10.1155/2022/9453913.

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In this paper, a new interleaved bidirectional buck-boost DC-DC converter is proposed. The input current of this converter is continuous and has a low ripple, that cause reduction in the size of the input filter of the converter. Because of these features, this converter is appropriate for renewable applications such as fuel cells and photovoltaic (PV) panels for obtaining maximum power in which the continuity of the input current is essential. The operation principle of this converter is detailed, and its power losses calculation shows the positive effects of the low input current ripple on its efficiency. The input current ripple of the proposed converter and conventional interleaved buck-boost converter has been calculated in detail. In addition, the comparison results of this converter with conventional interleaved buck-boost converters and other similar structures confirm that the proposed converter without utilizing extra components achieves continuous input current with low ripple. Compared with other buck-boost structures, the low input current ripple in the presented converter causes an improvement in its efficiency. An experimental prototype is implemented in the laboratory to confirm the correctness of theoretical analyses.

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Mazlan, Mazwin, Noor Haqkimi, Chanuri Charin, Nur Fairuz, Nurul Izni et Mohd Annuar. « State Feedback Controller Using Pole Placement Method for Linear Buck Converter to Improve Overshoot and Settling Time ». Applied Mechanics and Materials 793 (septembre 2015) : 211–15. http://dx.doi.org/10.4028/www.scientific.net/amm.793.211.

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Switched mode DC-DC converters are electronic circuits which convert a voltage from one level to a higher or lower level voltage. This paper presents a new solution approach to controller and observer controller of DC-DC Buck converter. The designs in this paper of DC-DC Buck converter is input voltage 20V step down to 12V output voltage. For control the system simulation investigation into development of controller and observer controller using MATLAB Simulink® software. The simulation develops of the controller and observer controller with mathematical model of DC-DC Buck converter. This paper also providing LQR controller to compare the performance of the system. Finally, the performance output voltage of DC-DC Buck converter is analyzed in terms of time response, overshoot and steady state error.

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Gil-González, Walter, Oscar Danilo Montoya, Carlos Restrepo et Jesus C. Hernández. « Sensorless Adaptive Voltage Control for Classical DC-DC Converters Feeding Unknown Loads : A Generalized PI Passivity-Based Approach ». Sensors 21, n^o 19 (24 septembre 2021) : 6367. http://dx.doi.org/10.3390/s21196367.

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The problem of voltage regulation in unknown constant resistive loads is addressed in this paper from the nonlinear control point of view for second-order DC-DC converters. The converters’ topologies analyzed are: (i) buck converter, (ii) boost converter, (iii) buck-boost converter, and (iv) non-inverting buck-boost converter. The averaging modeling method is used to model these converters, representing all these converter topologies with a generalized port-Controlled Hamiltonian (PCH) representation. The PCH representation shows that the second-order DC-DC converters exhibit a general bilinear structure which permits to design of a passivity-based controller with PI actions that ensures the asymptotic stability in the sense of Lyapunov. A linear estimator based on an integral estimator that allows reducing the number of current sensors required in the control implementation stage is used to determine the value of the unknown resistive load. The main advantage of this load estimator is that it ensures exponential convergence to the estimated variable. Numerical simulations and experimental validations show that the PI passivity-based control allows voltage regulation with first-order behavior, while the classical PI controller produces oscillations in the controlled variable, significantly when the load varies.

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Babaei, Ebrahim, Zahra Saadatizadeh et Behnam Mohammadi Ivatloo. « A New Interleaved Bidirectional Zero Voltage Switching DC/DC Converter with High Conversion Ratio ». Journal of Circuits, Systems and Computers 26, n^o 06 (5 mars 2017) : 1750105. http://dx.doi.org/10.1142/s0218126617501055.

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In this paper, a new interleaved nonisolated bidirectional zero voltage switching (ZVS) dc–dc converter by using one three-windings coupled inductor is proposed. The proposed topology can provide high step-up and high step-down conversion ratios for boost and buck operations, respectively. Moreover, because of interleaving, the proposed converter has low input current ripple at low voltage side in both buck and boost operations. The proposed converter uses lower number of switches to have bidirectional power flow in comparison with other interleaved bidirectional converters. All used switches in the proposed converter are turned on under ZVS. The advantages of the proposed converter in comparison with the conventional interleaved converters are included in the capability of bidirectional power flow, ZVS operation for all switches and high step-up and high step-down voltage gain for boost and buck operations. In this paper, the proposed converter is analyzed completely and all equations of components are extracted as well as the ZVS conditions of all switches. Moreover, a comprehensive comparison between the proposed converter and conventional topologies is presented. To verify the accuracy performance of the proposed converter, the experimental results are given.

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Peter Drgona, Rastislav Stefun, Slavomir Kascak et Jan Morgos. « Demonstration of a System Identification on Real Step-Down Power Converters ». Communications - Scientific letters of the University of Zilina 22, n^o 4 (1 octobre 2020) : 128–33. http://dx.doi.org/10.26552/com.c.2020.4.128-133.

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System identification is a scientific field with a wide range of applications, including transport and transportation systems. Automotive industry has a growing trend of power converters implementation. In addition, intelligence of converters is developing. Thus, the power electronics and autotronics are application areas where identification can also be applied. Since buck (step-down), boost (step-up) and buck-boost are the most common topologies of the converters in automobiles, this article aims to demonstrate possibilities of using the identification procedure on the synchronous buck converter. The objective is to obtain a parametric model that could be further useful in analysis and other work with the converter.

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Reyes-Portillo, I. A., S. R. Méndez-Elizondo, J. A. Morales-Saldaña, E. R. Palacios-Hernández et C. A. Rivera-Romero. « Modeling of an Interleaved Quadratic Buck Converter ». Memorias del Congreso Nacional de Control Automático 5, n^o 1 (17 octobre 2022) : 140–45. http://dx.doi.org/10.58571/cnca.amca.2022.012.

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This paper presents the modeling of a Quadratic Buck Converter with interleaved function, operating in continuous conduction mode. The structure of the proposed converter presents better functional aspects with respect to other Quadratic Buck converters reported in the literature. This work establishes the general structure of the proposed converter, as well as its operation. In addition, the switching model and the average model are developed in order to obtain the dynamic characteristics of the system, which are used for the design of the controllers.

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Suntio, Teuvo. « Modeling and Analysis of a PCM-Controlled Boost Converter Designed to Operate in DCM ». Energies 12, n^o 1 (20 décembre 2018) : 4. http://dx.doi.org/10.3390/en12010004.

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Peak current-mode (PCM) control has been a very popular control method in power electronic converters. The small-signal modeling of the dynamics associated with PCM control has turned out to be extremely challenging. Most of the modeling attempts have been dedicated to the converters operating in continuous conduction mode (CCM) and just a few to the converters operating in discontinuous operation mode (DCM). The DCM modeling method published in 2001 was proven recently to be very accurate when applied to a buck converter. This paper provides the small-signal models for a boost converter and analyses for the first time its real dynamic behavior in DCM. The objectives of this paper are as follows: (i) to provide the full-order dynamic models for the DCM-operated PCM-controlled boost converter; (ii) to analyze the accuracy of the full and reduced-order dynamic models; and iii) to verify the validity of the high-frequency extension applied in the DCM-operated PCM-controlled buck converter in the case of the boost converter. It is also shown that the DCM-operated boost converter can operate only in even harmonic modes, similar to all the CCM-operated PCM-controlled converters. In the case of the DCM-operated PCM-controlled buck converter, its operation in the odd harmonic modes is the consequence of an unstable pole in its open-loop power-stage dynamics.

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Zaikin, Denys Igorovych. « Self‐oscillating isolated‐buck (fly‐buck) converter ». Journal of Engineering 2021, n^o 9 (24 juin 2021) : 517–33. http://dx.doi.org/10.1049/tje2.12060.

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Ramos-Paja, Carlos Andres, Juan David Bastidas-Rodriguez et Andres Julian Saavedra-Montes. « Low-Voltage Photovoltaic System Based on a Continuous Input/Output Current Converter ». Computation 11, n^o 2 (20 février 2023) : 42. http://dx.doi.org/10.3390/computation11020042.

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Low-voltage photovoltaic systems are being widely used around the world, including their introduction into the power grid. The development of these systems requires the adaptation of several power converters, their static and dynamic modeling, the design of passive elements, and the design of the controller parameters, among other actions. Today, power converters are key elements in the development of photovoltaic systems, and classical power converters such as buck converters produce discontinuous input and output currents, requiring a high input capacitance and impacting the output power quality of these systems. This paper presents a proposal for a low-voltage photovoltaic system that uses a continuous input/output current buck converter, which enhances the operation of the classical buck converter in photovoltaic systems. The methodology describes the proposed photovoltaic system, including the power converter, its detailed operation, and the analysis of its waveforms. Moreover, the methodology includes a mathematical model of the photovoltaic system’s dynamic behavior and the design of a sliding-mode controller for maximum power extraction and perturbation rejection. The photovoltaic system is validated in two ways: first, a comparison with the classical buck converter highlighting the advantages of continuous input/output currents is presented; then, an application example using commercial devices is described in detail. The application example uses a flowchart to design the power converter and the sliding-mode controller, and a circuit simulation confirms the advantages of the continuous input/output current buck converter with its controller. In the circuit simulation, the control strategy is formed by a perturb and observe algorithm that generates the voltage reference for the sliding-mode controller, which guarantees the system stability, tracks the maximum power point, and rejects the double-frequency oscillations generated by an intended microinverter.

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Muhammad, Khairul Safuan, Rahimi Baharom, Siti Zaliha M. N et Wan Noraishah Wan Abdul Munim. « Comparative performance analysis of bridgeless boost and bridgeless buck converter for UPS application ». International Journal of Power Electronics and Drive Systems (IJPEDS) 11, n^o 2 (1 juin 2020) : 801. http://dx.doi.org/10.11591/ijpeds.v11.i2.pp801-809.

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In this paper, a comparative performance analysis of bridgeless boost and bridgeless buck converter for Uninterruptable Power Supply (UPS) is presented. The performance of UPS application in terms of their efficiency is compared between the conventional diode bridge converter and both bridgeless converters. The input supply power quality is also been analysed by applying open and closed loop control techniques to the converter. The results show that the efficiency and the input supply quality of the bridgeless converters are significantly improved. UPS using bridgeless boost converter has better performance in all aspect compared to bridgeless buck converter. Aligned with that, the closed loop controller for the converter has also improved the efficiency and PF more than the open loop controller in performing the UPS system. All the analytical work was performed using PSIM software.

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Besekar, Nikita Prashant. « DC-DC Converters Topology ». Journal of Image Processing and Intelligent Remote Sensing, n^o 32 (8 février 2023) : 11–21. http://dx.doi.org/10.55529/jipirs.32.11.21.

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In this paper the various perspectives on different dc-dc converters are reviewed . The various advantages and disadvantages of both Converter topologies that are classical and recent converters and overview of dc micro grid are discussed. From the data we found that every Converter has some advantages and disadvantages also but the Buck, Boost, Cuk and zeta Converter have less ripple. And Buck and Boost has the best efficiency as per cost. The dc micro grid has lots of advantages over AC microgrids; they can perform reliable operation, higher efficiency, low power loss and no skin effect. Theoretical and practical implications were discussed. Advanced dc converters are also reviewed.

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Sutikno, Tole, Rizky Ajie Aprilianto et Hendril Satrian Purnama. « Application of non-isolated bidirectional DC–DC converters for renewable and sustainable energy systems : a review ». Clean Energy 7, n^o 2 (25 mars 2023) : 293–311. http://dx.doi.org/10.1093/ce/zkac070.

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Abstract The primary challenge in renewable-energy utilization is an energy-storage system involving its power converter. The systems have to promise high efficiency, reliability and durability. Also, all of these can be realized at an economical cost. Buck and boost converters connected in parallel can convert power in both directions. It is the basic non-isolated bidirectional topology commonly used with energy-storage systems. The primary issue with the buck–boost non-isolated bidirectional converter is how to enhance its performance, so the modification involving this topology is still conducted. This paper examines 29 proposed converters from 30 research publications published in the last 10 years, the most recent of which focuses on modified non-isolated bidirectional converters based on the buck–boost topology. These are classified into eight modification schemes, which involve adding new components or circuits to the base topology. Each is evaluated against six parameters: the number of components, control complexity, power-rating applications, soft-switching ability, efficiency outcome and capacity to minimize losses. Moreover, each modified non-isolated bidirectional converter was compared from the renewable-energy-based power-generation-source perspective utilized. Based on these studies, researchers might think of ways to improve the buck–boost converter by changing it to make a new non-isolated bidirectional converter that can be used in systems that need it.

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Venkatesh, Naik, et Paulson Samuel. « A high efficiency non-inverting multi device buck-boost DC-DC converter with reduced ripple current and wide bandwidth for fuel cell low voltage applications ». Serbian Journal of Electrical Engineering 15, n^o 2 (2018) : 165–86. http://dx.doi.org/10.2298/sjee171104002v.

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The voltage produced by the fuel cell (FC) device is unregulated and varies from 0.4 V to 0.8 V on full load to no-load respectively. When these devices are used in low voltage applications and output voltage lies between higher and lower values of input voltage range, it is required to connect a DCDC buck-boost converter to get a fixed output voltage. In this paper, a new noninverting multi device buck boost converter (MDBBC) is proposed, in which the multi device buck and boost converters are connected in cascade and operate individually either in buck or boost operating modes. The paper also includes the steady state analysis of MDDBC based on the state space averaging technique. A prototype model of proposed converter compatible with FCS-1000 Horizon FC model with rating of 270 W, 36 V is designed and developed. The proposed converter is experimentally validated with the results obtained from the prototype model, and results show the superiority of the converter with higher efficiency and lesser ripple current observed under steady state operation of the converter.

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Cheng, Hung Liang, Chun An Cheng, Chao Shun Chen et Kuan Lung Huang. « Design and Implementation of a Dimmable LED Driver with Low-Frequency PWM Control ». Applied Mechanics and Materials 284-287 (janvier 2013) : 2538–42. http://dx.doi.org/10.4028/www.scientific.net/amm.284-287.2538.

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This paper proposes a high-efficiency dimmable LED driver for light emitting diodes (LED). The developed LED driver consists of a full-bridge resonant converter and six buck converters. The function of the full-bridge resonant converter is to obtain a smooth dc-link voltage for the buck converters by phase-shift modulation (PSM) while that of the six buck converters is to drive six LED modules, respectively. The gate voltage of the active switch of each buck converter is a combination of high-frequency and low-frequency pulses. The duty ratio of the high-frequency pulse controls the LED voltage and thereby, controls the amplitude of LED current. LEDs are dimmed by low-frequency pulse-width modulation (PWM) to vary the average current flowing through LED. Circuit equations are derived and circuit parameters are designed. High circuit efficiency is ensured by operating the active switches at zero-voltage switching-on to reduce the switching loss. Finally, a prototype circuit was built to verify the accuracy and feasibility of the proposed LED driver.

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Jiao, Haoyu, Mingzhi He, Pan Feng et Shuhan Zhou. « Modeling and Analysis of Voltage Ripple-Controlled SIDO Buck Converter in Pseudo-Continuous Conduction Mode with Limited Cross-Regulation and Fast Load Transient Performance ». Electronics 11, n^o 11 (30 mai 2022) : 1731. http://dx.doi.org/10.3390/electronics11111731.

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Typical voltage mode-controlled DC–DC converters with single-inductor dual-output (SIDO) in pseudo-continuous conduction mode (PCCM) have slow load transient performance, and cross-regulation still exists between their two outputs. For the purposes of suppressing the cross-regulation and improving the load transient performance, a voltage ripple control technique for a PCCM SIDO buck converter is proposed in this study. A description of the PCCM SIDO buck converter and the voltage ripple control technique is provided in detail. In addition, the small-signal model was established, and the cross-regulation was further compared by Bode plots, as well as the load range and the power losses being analyzed. The cross-regulation and load transient performance of the voltage ripple-controlled PCCM SIDO buck converter was studied and compared with the conventional voltage mode-controlled. Using the proposed voltage ripple control for PCCM SIDO buck converters, we found no cross-regulation or rapid load transient behavior, which was validated by experimental results.

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Kapun, Aljaž, Mitja Truntič, Alenka Hren et Miro Milanovič. « Capacitor-less Buck Converter ». Automatika 52, n^o 4 (janvier 2011) : 286–94. http://dx.doi.org/10.1080/00051144.2011.11828428.

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