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Journal articles on the topic 'Half-bridge LLC Resonant Converter'

Author: Grafiati

Published: 4 June 2021

Last updated: 4 February 2022

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1

Gao, Tian, Qi Wang, Yan Yang, and He He. "Modeling and Design of High Power Half-Bridge LLC Resonant Converter." Advanced Materials Research 711 (June 2013): 367–74. http://dx.doi.org/10.4028/www.scientific.net/amr.711.367.

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ntroduction was made to the working principle of topology for the half-bridge LLC resonant converter. Steady-state models of the high power LLC resonant network were researched. The high power half-bridge LLC converter was modeled and analyzed with First Harmonic Approach so as to obtain the optimal parameters. The turn ration of the converter was selected. The resonant inductance, resonant capacitance and excitation inductance were designed. The feasibility of the high power LLC converter design has been verified through simulation.

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2

Ma, Jianguang, Xueye Wei, Liang Hu, and Junhong Zhang. "Small-Signal Modeling of the LLC Half-Bridge Resonant Converter." Journal of Circuits, Systems and Computers 28, no. 04 (March 31, 2019): 1950063. http://dx.doi.org/10.1142/s0218126619500634.

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This paper proposes a small-signal modeling method for building an LLC half-bridge resonant converter. In recent years, the LLC half-bridge resonant converter has attracted the attention of many researchers because of its high-power conversion efficiency and high-power density. Generally, the LLC half-bridge resonant converter consists of many passive components, including stray and parasitic elements, resulting in a high-order system. Because the fundamental harmonic approximation (FHA) method for an LLC resonant converter only considers the fundamental harmonic and neglects higher harmonics, it is not accurate and introduces large errors in a higher-order system. In this paper, according to the operation principle of the LLC half-bridge resonant converter, a small-signal model is established. Based on the small-signal model, the input-to-output and control-to-output transfer function is derived. The experimental result verified that the proposed model yields a high accuracy, thereby highlighting the usefulness and versatility of the proposed model over other existing models.

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3

Kim, Sung-Wan, and Chang-Sun Kim. "The Efficiency Characteristics of LLC Half-Bridge Resonant Converter." Transactions of The Korean Institute of Electrical Engineers 60, no. 7 (July 1, 2011): 1366–71. http://dx.doi.org/10.5370/kiee.2011.60.7.1366.

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4

Kim, Yeung-Suk, and Young-Tae Kim. "Adaptive Current Control of Power LEDs Using Half-Bridge LLC Resonant Converter." Journal of the Korean Institute of Illuminating and Electrical Installation Engineers 27, no. 4 (April 30, 2013): 48–53. http://dx.doi.org/10.5207/jieie.2013.27.4.048.

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5

Mohammed Dobi, Abdulhakeem, and Mohd Rodhi Sahid. "Non-isolated LLC resonant DC-DC converter with balanced rectifying current and stress." Indonesian Journal of Electrical Engineering and Computer Science 18, no. 2 (May 1, 2020): 698. http://dx.doi.org/10.11591/ijeecs.v18.i2.pp698-706.

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<p><span>In isolated type LLC resonant converters, transformer leakage inductances can be merged with the resonant inductor to extend the ZVS capability of the switches apart from isolation and voltage scaling. However, the transformer presents a resonant imbalance in the secondary side leading to secondary current unbalance, an increase in RMS value of the secondary current and increase thermal stress. This paper proposed a half-bridge non-isolated LLC resonant converter with a balanced rectifying current and stress in the rectifier diodes. The proposed converter can achieve the most advantages of isolated LLC converters, such as ZVS and low MOSFET turn-off loss. By the non-isolation method, secondary current and, transformer loss is significantly reduced. In addition, rectifier diodes operate with zero current switching and balanced rectifying current and stress over the entire operating range. The proposed non-isolated structure is verified by the experimental result with a 60W LLC resonant converter. </span></p>

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6

Lin, Yi-Feng, Chuan Ting Chen, Zong-Xian Jiang, and Jing-Yuan Lin. "Interleaved LLC half-bridge series resonant converter with integrated transformer." Journal of the Chinese Institute of Engineers 44, no. 4 (May 4, 2021): 388–98. http://dx.doi.org/10.1080/02533839.2021.1903340.

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7

Jiang, Nian Ping, Zhi Jie Ma, and Peng Hong Yin. "Parallel Resonant Power Supply Based on Chip UC3863." Applied Mechanics and Materials 401-403 (September 2013): 479–82. http://dx.doi.org/10.4028/www.scientific.net/amm.401-403.479.

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This paper analyses the characteristics of parallel LLC resonant converter, and makes the comparison of the characteristics of the order switch shunt and staggered parallel switch circumstances converter. The circuit uses UC3863 chip as the core control chip switch power supply, circuit adopts the half bridge structure. This model is seldom put forward through the experiments prove the feasibility and practicability of the LLC, and greatly improving the working efficiency. Using SABER simulation software for the converter circuit simulation and analysis with the theoretical calculation of the device parameters. Example of 300v voltage input, 12-18v output voltage, 2.5 KW, 500 KHZ parallel LLC resonant converter design and simulation for model analysis. Sum up the advantages of the parallel LLC resonant converter compared with the traditional LLC resonant converter .The results of simulation verify the feasibility of the design and the accuracy of the conclusion.

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8

Salehi, Navid, Herminio Martinez-Garcia, and Guillermo Velasco-Quesada. "A Comparative Study of Different Optimization Methods for Resonance Half-Bridge Converter." Electronics 7, no. 12 (December 2, 2018): 368. http://dx.doi.org/10.3390/electronics7120368.

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The LLC resonance half-bridge converter is one of the most popular DC-DC converters and could easily inspire researchers to design a high-efficiency and high-power-density converter. LLC resonance converters have diverse operation modes based on switching frequency and load that cause designing and optimizing procedure to vary in different modes. In this paper, different operation modes of the LLC half-bridge converter that investigate different optimization procedures are introduced. The results of applying some usual optimization methods implies that for each operation mode some specific methods are more appropriate to achieve high efficiency. To verify the results of each optimization, numerous simulations are done by Pspice and MATLAB and the efficiencies are calculated to compare them. Finally, to verify the result of optimization, the experimental results of a laboratory prototype are provided.

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9

Li, Si, Yan Wang, and Tian Ming Yin. "Research on 12V DC/DC Converter for Pure Electric Vehicles." Applied Mechanics and Materials 614 (September 2014): 254–60. http://dx.doi.org/10.4028/www.scientific.net/amm.614.254.

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As one of the important parts of PEV (Pure Electric Vehicles), the efficiency and power density of DC/DC converter are important indicators of its performance. The efficiency of hard-switching DC/DC converter is low, so it can’t meet the requirements of PEV. To overcome such kind of problems, a DC/DC converter of 12V-30A output for PEV with LLC half-bridge resonant circuit and synchronous rectification technology is presented in this paper. Firstly, the operational principle of LLC half-bridge resonant circuit is analyzed in detail. Then the parameters of resonant network are designed based on theoretical analysis and verified. Finally, an experimental prototype of 12V-30A output for PEV is built and the efficiency is over 90%. The experimental results and running performance in PEV of the presented DC/DC converter is good enough to replace the 12V Lead-acid battery, which has broad application prospects.

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10

Jun, TONG, LI Facheng, LI Xiang, and YANG Xingchen. "Loss Analysis and Optimization Design of Half-Bridge LLC Resonant Converter." IOP Conference Series: Materials Science and Engineering 533 (May 30, 2019): 012017. http://dx.doi.org/10.1088/1757-899x/533/1/012017.

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11

Li, Sen, and Babak Fahimi. "State‐space modelling of LLC resonant half‐bridge DC–DC converter." IET Power Electronics 13, no. 8 (June 2020): 1583–92. http://dx.doi.org/10.1049/iet-pel.2019.1503.

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12

Stolyarova, A. A., S. G. Mikhalcenko, and V. I. Apasov. "Mathematical model of the LLC resonant converter." Proceedings of Tomsk State University of Control Systems and Radioelectronics 23, no. 3 (September 25, 2020): 86–91. http://dx.doi.org/10.21293/1818-0442-2020-23-3-86-91.

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The numerical-analytical model of the voltage regulator based on full-bridge LLC resonant converter is proposed in this paper. In the text of the article LLC converters operation algorithm on each working interval is investigated. The proposed mathematical model describes key elements behavior on duty cycle and allows the study of nonlinear dynamic characteristics of these type power converters. Also, the results of mathematical and simulation the modeling main parameters of the LLC converters, which confirm the adequacy of the proposed mathematical model are given.

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13

Lin, Bor-Ren, and Kun-Yi Chen. "Hybrid LLC Converter with Wide Range of Zero-Voltage Switching and Wide Input Voltage Operation." Applied Sciences 10, no. 22 (November 20, 2020): 8250. http://dx.doi.org/10.3390/app10228250.

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A new hybrid inductor-inductor-capacitor (LLC) converter is investigated to have wide voltage input operation capability and zero-voltage turn-on characteristics. The presented circuit topology can be applied for consumer power units without power factor correction or with long hold-up time requirement, photovoltaic energy conversion and renewable energy power transfer. To overcome the weakness of narrow voltage gain of resonant converter, the hybrid LLC converter with different turns ratio of transformer is presented and the experimental investigation is provided to achieve wide voltage input capability (400 V–50 V). On the input-side, the converter can operate as full bridge resonant circuit or half bridge resonant circuit with input split capacitors for high or low voltage input region. On the output-side, the less or more winding turns is selected to overcome wide voltage input operation. According to the circuit structures and transformer turns ratio, the single stage LLC converter with wide voltage input operation capability (400 V–50 V) is accomplished. The laboratory prototype has been developed and the experimental waveforms are measured and demonstrated to investigate the effectiveness of the presented hybrid LLC converter.

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14

Han, Woo-Yong, and Hyo-Sik Park. "200[W] Half-Bridge LLC Series Resonant Converter for driving LED Lamp." Journal of the Korea Academia-Industrial cooperation Society 11, no. 11 (November 30, 2010): 4483–88. http://dx.doi.org/10.5762/kais.2010.11.11.4483.

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15

Yoo, Doo-Hee, and Gang-Youl Jeong. "Current Unbalance Improved Half-bridge LLC Resonant Converter using the Two Transformers." Journal of the Korea Academia-Industrial cooperation Society 11, no. 2 (February 28, 2010): 497–507. http://dx.doi.org/10.5762/kais.2010.11.2.497.

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16

Pandey, Rahul, and Bhim Singh. "PFC‐SEPIC converter‐fed half‐bridge LLC resonant converter for e‐bike charging applications." IET Electrical Systems in Transportation 10, no. 3 (September 2020): 225–33. http://dx.doi.org/10.1049/iet-est.2019.0001.

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17

Gowri, A. "Design of Half Bridge LLC Resonant Converter for Low Voltage Dc Applications." IOSR Journal of Electrical and Electronics Engineering 12, no. 02 (March 2017): 11–22. http://dx.doi.org/10.9790/1676-1202011122.

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18

Indurthy, Hitesh. "Closed loop analysis of Dual Bridge Converter with 4- levels." International Journal for Research in Applied Science and Engineering Technology 9, no. 8 (August 31, 2021): 1994–96. http://dx.doi.org/10.22214/ijraset.2021.37709.

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Abstract: A dual bridge (DB) LLC resonant converter for dc-dc conversion with closed loop is proposed in the system. The model is capable of delivering very low voltage, with a variable input dc fluctuations in the source side. The new PWM technique used helps the bridge output robust. The proposed model works only in 4 modes of operation. DB LLC converter uses different phase shift for each individual switches with different duty ratios. The model is simulated with 160V/200V DC input and 24V output with 20A i.e. 480W is provided to verify the operation. Keywords: Dual Bridge, LLC resonant converter, Closed loop operation, Boost converter.

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19

Cao, Ting. "The Design of High Power LED Driver Power Supply Based on the Pattern of LLC Harmonic." Advanced Materials Research 997 (August 2014): 862–67. http://dx.doi.org/10.4028/www.scientific.net/amr.997.862.

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The working principle of LLC resonant converter is analyzed. On the basis of the analysis, a high power LED driver power supply circuit is designed based on LLC resonant model. Driver circuit is two-stage: the pre-driver circuit using boundary-conduction mode controller L6562 achieves PFC function, while the post-stage LLC half-bridge topology provides constant pressure parts. This structure makes the overall efficiency of the circuit is higher. And the simulation experiment of the circuit is carried out and the experimental results verify that the driver power supply can achieve high efficiency, low loss and so on.

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20

HALAKURKI, RAMESH, and P. NAVEEN KUMAR. "Analysis and Design of PFM Half-Bridge LLC Resonant Converter for Different Loads." International Journal of Advanced Research in Electrical, Electronics and Instrumentation Engineering 03, no. 10 (October 20, 2014): 12386–93. http://dx.doi.org/10.15662/ijareeie.2014.0310010.

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21

Cheng, Chang, Cheng, Chang, Chung, and Chang. "A Single-Stage LED Streetlight Driver with Soft-Switching and Interleaved PFC Features." Electronics 8, no. 8 (August 18, 2019): 911. http://dx.doi.org/10.3390/electronics8080911.

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This paper presents a single-stage driver with soft-switching and interleaved power-factor correction (PFC) features suitable for light-emitting diode (LED) energy-saving streetlight applications. The proposed LED streetlight driver integrates an interleaved buck-boost PFC converter with coupled inductors and a half-bridge LLC resonant converter into a single-stage power-conversion circuit with reduced voltage stress on the DC-linked capacitor and power switches, and it is suitable for operating at high utility-line voltages. Furthermore, coupled inductors in the interleaved buck-boost PFC converter are operated in discontinuous-conduction mode (DCM) for accomplishing PFC, and the half-bridge LLC resonant converter features zero-voltage switching (ZVS) to reduce switching losses of power switches, and zero-current switching (ZCS) to decrease conduction losses of power diodes. Operational modes and design considerations for the proposed LED streetlight driver are introduced. Finally, a 144 W (36V/4A)-rated LED prototype driver is successfully developed and implemented for supplying a streetlight module and operating with a utility-line input voltage of 220 V. High power factor, low output-voltage ripple factor, low output-current ripple factor, and high efficiency are achieved in the proposed LED streetlight driver.

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22

Frivaldsky, Michal, Jan Morgos, and Andrej Kanovsky. "Dual Interleaved LLC Converter for High Power Applications and Wide Load Range." Elektronika ir Elektrotechnika 25, no. 3 (June 25, 2019): 4–9. http://dx.doi.org/10.5755/j01.eie.25.3.23669.

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Dual interleaved LLC resonant converter with half bridge topology of main circuit characterized by high switching frequency (500 kHz), high power density (60 W/inch3) and high efficiency (above 96 %) over entire operational range (20 %–100 %) is described. Focus was given on the practical design of power converter, which will be able to fulfil requirements on wide load range operation characterized by upcoming normative. Since proposed topology is based on dual interleaved LLC converter, the resonant component´s critical tolerance was also investigated to secure reliable and optimal operational point. Consequently, proposals for elimination of intolerance negative impact are also described. The results of theoretical analysis were verified directly through experimental measurements. Experimental results are finally compared with upcoming industrial standard 80 Plus Titanium.

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23

Lin, Bor-Ren, and Guan-Hong Lin. "DC Converter with Wide Soft Switching Operation, Wide Input Voltage and Low Current Ripple." Applied Sciences 10, no. 13 (July 7, 2020): 4672. http://dx.doi.org/10.3390/app10134672.

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A soft switching current-source resonant converter is presented and implemented for wide voltage applications such as fuel cells and solar power. An LLC (inductor–inductor–capacitor) converter is adopted to accomplish zero voltage (current) operation on active switches (diodes). Thus, the circuit efficiency is increased. The interleaved pulse-width modulation (PWM) converter is employed on the input side to accomplish low input ripple current. A hybrid LLC converter is adopted to achieve wide voltage operation from Vin, min to 4Vin, min and to improve the weakness of a conventional LLC converter. Half-bridge diode rectification is employed on the output side to decrease power loss on the rectifier diode. To confirm the theoretical analysis and feasibility, experimental verifications with a 500-W prototype are demonstrated in this paper.

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24

Bhajana, V. V. S. K., and P. Drabek. "Development and Evaluation of an Isolated Resonant Converter for Auxiliary Power Supply in DC Traction." Engineering, Technology & Applied Science Research 9, no. 2 (April 10, 2019): 4048–52. http://dx.doi.org/10.48084/etasr.2692.

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This paper presents the implementation and evaluation of an isolated resonant converter and also compares the efficiencies of hard and soft switching isolated converter topologies using high-frequency transformer for auxiliary power supplies in DC traction. The half-bridge DC-DC converter with resonant network has been tested under zero voltage switching (ZVS), zero current switching (ZCS) operations, and also dead time variation of the power switches improving the overall system efficiency. This paper provides guidelines for a cost effective DC-DC converter design based on discrete 1200V/40A IGBTs driven with high switching frequency. That would allow optimization of passive elements by reducing their mass making the converter suitable for traction application. Simulations and test results of an experimental setup with output power up to 3kW are presented. The overall system efficiency of the ZVS and ZCS operations of half-bridge LLC DC-DC converter were compared with a classic hard switching topology.

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25

Lin, Bor-Ren, and Yen-Chun Liu. "Implementation of a Wide Input Voltage Resonant Converter with Voltage Doubler Rectifier Topology." Electronics 9, no. 11 (November 17, 2020): 1931. http://dx.doi.org/10.3390/electronics9111931.

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A new circuit structure of LLC converter is studied and implemented to achieve wide zero-voltage switching range and wide voltage operation such as consumer power units without power factor correction and long hold up time demand, battery chargers, photovoltaic converters and renewable power electronic converters. The dc converter with the different secondary winding turns is adopted and investigated to achieve the wide input voltage operation (50–400 V). To meet wide voltage operation, the full bridge and half bridge dc/dc converters with different secondary turns can be selected in the presented circuit to have three different voltage gains. According to input voltage range, the variable frequency scheme is employed to have the variable voltage gain to overcome the wide input voltage operation. Therefore, the wide soft switching load variation and wide voltage operation range are achieved in the presented resonant circuit. The prototype circuit is built and tested and the experiments are demonstrated to investigate the circuit performance.

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26

Tran, Tran, and Choi. "A Hybrid Soft Switching Full Bridge Converter Suitable for the Electric Vehicle Charge Applications." Energies 12, no. 14 (July 15, 2019): 2707. http://dx.doi.org/10.3390/en12142707.

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A hybrid dc–dc converter suitable for the on-board charger applications consisted of a Soft Switching Full Bridge (SSFB) converter and a Half Bridge (HB) LLC resonant converter is proposed. The proposed topology employs an additional switch and a diode at the secondary of the SSFB converter to eliminate the circulating current and to achieve the full soft switching of the primary switches. The output voltage is regulated by adjusting the duty of the secondary side switch. The validity and feasibility of the proposed converter are verified by the experiments with a 10-kW prototype converter. The maximum of 96.8% efficiency is achieved at 5 kW output power.

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27

Ahn, Tae-Young, and Bum-Sun Im. "A Study on the Synchronous Rectifier Driver Circuits in the LLC Resonant Half-Bridge Converter." Journal of the Korean Institute of Illuminating and Electrical Installation Engineers 30, no. 1 (January 31, 2016): 79–86. http://dx.doi.org/10.5207/jieie.2016.30.1.079.

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28

Choi, Bong-Yeon, Soon-Ryung Lee, Jin-Wook Kang, Won-Sang Jeong, and Chung-Yuen Won. "A Novel Dual Integrated LLC Resonant Converter Using Various Switching Patterns for a Wide Output Voltage Range Battery Charger." Electronics 8, no. 7 (July 6, 2019): 759. http://dx.doi.org/10.3390/electronics8070759.

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This paper proposes a novel dual integrated LLC resonant converter (DI-LRC) with a wide output voltage range using various switching patterns. The primary side of the proposed DI-LLC converter consists of two resonant tanks and six switches, while the secondary side consists of a six-pulse diode rectifier. Depending on the switching pattern of the primary switch, the DI-LRC converter is performed by single full-bridge operation with a voltage gain of 1, series-connected full-bridge operation with a voltage gain of 0.5, series-connected half bridge operation with a voltage gain of 0.25, and parallel-connected full-bridge operation with a voltage gain of 2. Accordingly, the proposed DI-LRC converter has four voltage gain curves with different variations and achieves a wider output voltage range than the conventional single voltage gain curve in a given operating frequency range. In this paper, the equivalent circuits derived for each switching pattern are proposed to analyze the operating characteristics of the proposed converter according to each switching pattern, and each Q factor and voltage gain are calculated based on the analyzed equivalent circuit. The performance of the proposed converter and switching pattern is verified using the simulation and experimental results of the prototype battery charger, which is designed to be 4-kW class.

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29

Lo, Yu-Kang, Jing-Yuan Lin, and Chung-Yi Lin. "Analysis and design of a half-bridge LLC series resonant converter employing two transformers." International Journal of Circuit Theory and Applications 40, no. 10 (March 29, 2011): 985–98. http://dx.doi.org/10.1002/cta.767.

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30

MA, JIANGUANG, XUEYE WEI, Liang HU, and wenting JIA. "Investigation on optimal parameter selection for LLC half-bridge resonant converter based on FHA." TURKISH JOURNAL OF ELECTRICAL ENGINEERING & COMPUTER SCIENCES 26, no. 2 (March 30, 2018): 895–905. http://dx.doi.org/10.3906/elk-1706-194.

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31

Wei, Yuqi, Quanming Luo, Xiong Du, Necmi Altin, Adel Nasiri, and J. Marcos Alonso. "A Dual Half-Bridge LLC Resonant Converter With Magnetic Control for Battery Charger Application." IEEE Transactions on Power Electronics 35, no. 2 (February 2020): 2196–207. http://dx.doi.org/10.1109/tpel.2019.2922991.

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32

Zhu, Tianyu, Jianze Wang, Yanchao Ji, and Yiqi Liu. "A Novel High Efficiency Quasi-Resonant Converter." Energies 11, no. 8 (July 27, 2018): 1961. http://dx.doi.org/10.3390/en11081961.

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In this paper, a new constant-frequency quasi-resonant converter is proposed. Compared with the traditional LLC converter, the proposed converter can effectively reduce the range of the operating frequency. The output voltage is changed to adjust the reactance of the resonant cavity. The proposed converter has a better loss factor. To verify the theoretical analysis and soft-switching condition, a 250 W, 100 V output prototype was built and compared with the full-bridge LLC converter. Analysis and experimental results verify that a smaller operating frequency range and volume of the transformers, a soft-switching condition, and a higher overall efficiency are achieved with the proposed converter.

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33

Liu, Chen Yao, Kuo Bin Liu, and Din Goa Huang. "Design of a Power Transformer for a LLC Resonant Power Converter." Advanced Materials Research 740 (August 2013): 823–29. http://dx.doi.org/10.4028/www.scientific.net/amr.740.823.

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We designed and implemented a power converter to provide a dc power bus for the MCOR 12 correction supply. The characteristics of the dc power bus are variable frequency at both heavy and medium or light loads. These characteristics match the working requirement of the correction supply. The dc power bus has a relaxation oscillator that generates a symmetric triangular waveform, to which MOSFET switching is locked. The frequency of this waveform is related to a voltage to be modulated with feedback circuitry. As a result, the circuit and complex transformer are driven with a half-bridge. We designed the complex resonant transformer and describe in this paper a simulation model that is highly important, thus to exploit its frequency-dependent transfer characteristics. We obtained a power bus with small ripple to provide the correction power. The high-performance characteristics of the resonant dc power bus are illustrated in this paper.

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34

Lin, Bor-Ren, and Wei-Po Liu. "Analysis of a Three-Level Bidirectional ZVS Resonant Converter." Applied Sciences 10, no. 24 (December 21, 2020): 9136. http://dx.doi.org/10.3390/app10249136.

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A bidirectional three-level soft switching circuit topology is proposed and implemented for medium voltage applications such as 750 V dc light rail transit, high power converters, or dc microgrid systems. The studied converter is constructed with a three-level diode-clamp circuit topology with the advantage of low voltage rating on the high-voltage side and a full-bridge circuit topology with the advantage of a low current rating on the low-voltage side. Under the forward power flow operation, the three-level converter is operated to regulate load voltage. Under the reverse power flow operation, the full-bridge circuit is operated to control high-side voltage. The proposed LLC resonant circuit is adopted to achieve bidirectional power operation and zero-voltage switching (ZVS). The achievability of the studied bidirectional ZVS converter is established from the experiments.

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35

Kim, Do-Hyun, Min-Soo Kim, Sarvar Hussain Nengroo, Chang-Hee Kim, and Hee-Je Kim. "LLC Resonant Converter for LEV (Light Electric Vehicle) Fast Chargers." Electronics 8, no. 3 (March 25, 2019): 362. http://dx.doi.org/10.3390/electronics8030362.

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This paper presents a Light Electric Vehicle (LEV) fast charger with a Lithium-Ion Battery (LIB) and Super-Capacitor (SC). The LEV fast charger consists of an AC/DC rectifier and LLC (Inductor-Inductor-Capacitor) resonant Full bridge converter. The LLC resonant converter has high-efficiency and low switching loss because of Zero Voltage Switching (ZVS). So, it is used widely in the industry. In general, the fast charger algorithm uses the Constant Current (CC) mode and Constant Voltage (CV). The CC mode starts at first and then the CV mode finishes. However, there is a big control value gap between the CC mode and CV mode. Therefore, when changing from CC to CV, the transient state occurs. To compensate for the transient state, we propose a new control algorithm. By means of this algorithm, we can achieve a higher level of safety and stability. The fast charger with LIB of 800 Wh and SC of 50 Wh is analyzed and verified, and we obtain a maximum efficiency of 96.4%. The discussions are validated using the LLC resonant full bridge converter prototype at the laboratory level.

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36

Lei, Hou, Niu Lida, Nie Xiangxin, and Ma Huizhuo. "Design of LLC Resonant Type Full-Bridge DC-DC Converter." Journal of Physics: Conference Series 1993, no. 1 (August 1, 2021): 012020. http://dx.doi.org/10.1088/1742-6596/1993/1/012020.

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37

Lee, Jae-Bum, Jae-Kuk Kim, Jae-Il Baek, Jae-Hyun Kim, and Gun-Woo Moon. "Resonant Capacitor On/Off Control of Half-Bridge LLC Converter for High-Efficiency Server Power Supply." IEEE Transactions on Industrial Electronics 63, no. 9 (September 2016): 5410–15. http://dx.doi.org/10.1109/tie.2016.2558481.

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38

In-Ho Cho, Young-Do Kim, and Gun-Woo Moon. "A Half-Bridge LLC Resonant Converter Adopting Boost PWM Control Scheme for Hold-Up State Operation." IEEE Transactions on Power Electronics 29, no. 2 (February 2014): 841–50. http://dx.doi.org/10.1109/tpel.2013.2257863.

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39

Jeong, Yeonho, Min-Su Lee, Jae-Do Park, Jae-Kuk Kim, and Ronald A. L. Rorrer. "Hold-Up Time Compensation Circuit of Half-Bridge LLC Resonant Converter for High Light-Load Efficiency." IEEE Transactions on Power Electronics 35, no. 12 (December 2020): 13126–35. http://dx.doi.org/10.1109/tpel.2020.2992751.

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40

Wang, Zhenmin, Wenyan Fan, Fangxiang Xie, and Chunxian Ye. "An 8kW LLC resonant converter in plasma power supply based on SiC power devices for efficiency improvement." Circuit World 45, no. 4 (November 4, 2019): 181–88. http://dx.doi.org/10.1108/cw-07-2018-0058.

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Purpose This paper aims to present an 8 kW LLC resonant converter designed for plasma power supply with higher efficiency and lighter structure. It presents how to solve the problems of large volume and weight, low performance and low efficiency of traditional plasma power supply. Design/methodology/approach At present, conventional silicon (Si) power devices’ switching performance is close to the theoretical limit determined by its material properties; the next-generation silicon carbide (SiC) power devices with outstanding advantages can be used to optimal design. This 8 kW LLC resonant converter prototype with silicon carbide (SiC) power devices with a modulated switching frequency ranges from 100 to 400 kHz. Findings The experimental results show that the topology, switching loss, rectifier loss, transformer loss and drive circuit of the full-bridge LLC silicon carbide (SiC) plasma power supply can be optimized. Research limitations/implications Due to the selected research object (plasma power supply), this study may have limited universality. The authors encourage the study of high frequency resonant converters for other applications such as argon arc welding. Practical implications This study provides a practical application for users to improve the quality of plasma welding. Originality/value The experimental results show that the full-bridge LLC silicon carbide (SiC) plasma power supply is preferred in operation under conditions of high frequency and high voltage. And its efficiency can reach 98%, making it lighter, more compact and more efficient than previous designs.

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Xiong, Ze Cheng, Qiang Yin, Zhi Jun Luo, and Hao Pang. "Step-Up DC/DC Transformer Based on LLC Resonant Full Bridge." Applied Mechanics and Materials 734 (February 2015): 864–67. http://dx.doi.org/10.4028/www.scientific.net/amm.734.864.

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In view of the LLC series resonant converter topology, it is well known as suitable for small and medium power application, the stabilization of output voltage and the environment of step-dowm. The scheme is proposed for a kind of the step-up DC/DC transformer based on LLC resonant full bridge. The detailed design method is given. The 3KW prototype is built. The experimental results show it has the characteristics of the constant current discharge, wide working frequency and high power desity, as well, the feasibility is verified.

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Liu, Yu-Chen, Chen Chen, Kai-De Chen, Yong-Long Syu, and Meng-Chi Tsai. "High-Frequency LLC Resonant Converter with GaN Devices and Integrated Magnetics." Energies 12, no. 9 (May 10, 2019): 1781. http://dx.doi.org/10.3390/en12091781.

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In this study, a light emitting diode (LED) driver containing an integrated transformer with adjustable leakage inductance in a high-frequency isolated LLC resonant converter was proposed as an LED lighting power converter. The primary- and secondary-side topological structures were analyzed from the perspectives of component loss and component stress, and a full-bridge structure was selected for both the primary- and secondary-side circuit architecture of the LLC resonant converter. Additionally, to achieve high power density and high efficiency, adjustable leakage inductance was achieved through an additional reluctance length, and the added resonant inductor was replaced with the transformer leakage inductance without increasing the amount of loss caused by the proximity effect. To optimize the transformer, the number of primary- and secondary-side windings that resulted in the lowest core loss and copper loss was selected, and the feasibility of the new core design was verified using ANSYS Maxwell software. Finally, this paper proposes an integrated transformer without any additional resonant inductor in the LLC resonant converter. Transformer loss is optimized by adjusting parameters of the core structure and the winding arrangement. An LLC resonant converter with a 400 V input voltage, 300 V output voltage, 1 kW output power, and 500 kHz switching frequency was created, and a maximum efficiency of 97.03% was achieved. The component with the highest temperature was the transformer winding, which reached 78.6 °C at full load.

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Kim, Keon-Woo, Yeonho Jeong, Jae-Sang Kim, and Gun-Woo Moon. "Low Common-Mode Noise Full-Bridge LLC Resonant Converter With Balanced Resonant Tank." IEEE Transactions on Power Electronics 36, no. 4 (April 2021): 4105–15. http://dx.doi.org/10.1109/tpel.2020.3025576.

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Tang, Xinxi, Hongfei Wu, Jian Zhao, and Yan Xing. "Family of half‐bridge LLC resonant converters with auxiliary switches for hold‐up operation." IET Power Electronics 12, no. 6 (May 2019): 1376–84. http://dx.doi.org/10.1049/iet-pel.2018.5654.

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Li, Hongbo, Wenqing Mei, Ye Yang, Wenguang Luo, Zhixue Zhang, and Xiaodi Zang. "Novel Frequency-Doubling Modulation and Control Strategy for Three-Level Full Bridge based Power Electronic Traction Transformers." E3S Web of Conferences 115 (2019): 01005. http://dx.doi.org/10.1051/e3sconf/201911501005.

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Power electronic traction transformers (PETTs) are widely investigated to substitute bulky line frequency transformers in railway traction system presently. This paper adopts the three-level topology for both grid-side cascaded converters and primary-sides of LLC resonant converters. The cascade number is reduced by half as well as isolated transformers compared to the traditional two-level configuration. Less cascade number of modular converters leaves relatively more space for electric insulation implementation, which is beneficial to PETTs in terms of the limited installation space in the train. A frequency-doubling modulation strategy for LLC resonant converters is proposed, which can enable the operating frequency of isolated transformers two times higher than the switching frequency to further reduce the transformer size without increasing the switching loss. Meanwhile the proposed modulation strategy can realize the capacitor voltage balance autonomously as well. Additionally, the control strategy of cascaded rectifiers and key parameter design guideline of LLC resonant converters are also introduced.

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Jeong, Yeonho, Min-Su Lee, Jae-Do Park, Jae-Kuk Kim, and Ronald A. L. Rorrer. "Erratum to “Hold-Up Time Compensation Circuit of Half-Bridge LLC Resonant Converter for High Light-Load Efficiency”." IEEE Transactions on Power Electronics 36, no. 2 (February 2021): 2446. http://dx.doi.org/10.1109/tpel.2020.3016190.

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Chou, Li-Ting, and Chih-Chiang Hua. "A New Phase Shift Full Bridge LLC Resonant Converter with Auxiliary Circuit." International Journal of Electronics and Electrical Engineering 7, no. 4 (2019): 65–69. http://dx.doi.org/10.18178/ijeee.7.4.65-69.

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Lin, Bor-Ren, and Yen-Chun Liu. "Analysis of a Wide Voltage Hybrid Soft Switching Converter." Electronics 10, no. 4 (February 16, 2021): 473. http://dx.doi.org/10.3390/electronics10040473.

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A hybrid PWM converter is proposed and investigated to realize the benefits of wide zero-voltage switching (ZVS) operation, wide voltage input operation, and low circulating current for direct current (DC) wind power conversion and solar PV power conversion applications. Compared to the drawbacks of high freewheeling current and hard switching operation of active devices at the lagging-leg of conventional full bridge PWM converter, a three-leg PWM converter is studied to have wide input-voltage operation (120–600 V). For low input-voltage condition (120–270 V), two-leg full bridge converter with lower transformer turns ratio is activated to control load voltage. For high input-voltage case (270–600 V), PWM converter with higher transformer turns ratio is operated to regulate load voltage. The LLC resonant converter is connecting to the lagging-leg switches in order to achieve wide load range of soft switching turn-on operation. The high conduction losses at the freewheeling state on conventional full bridge converter are overcome by connecting the output voltage of resonant converter to the output rectified terminal of full bridge converter. Hence, a 5:1 (600–120 V) hybrid converter is realized to have less circulating current loss, wide input-voltage operation and wide soft switching characteristics. An 800 W prototype is set up and tested to validate the converter effectiveness.

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Yoon, Ho-Young, Hyeon-Seok Lee, Seok-Hyeong Ham, Hyung-Jin Choe, and Bongkoo Kang. "Off-Time Control of LLC Resonant Half-Bridge Converter to Prevent Audible Noise Generation Under a Light-Load Condition." IEEE Transactions on Power Electronics 33, no. 10 (October 2018): 8808–17. http://dx.doi.org/10.1109/tpel.2017.2774840.

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de Groot, H., E. Janssen, R. Pagano, and K. Schetters. "Design of a 1-MHz LLC Resonant Converter Based on a DSP-Driven SOI Half-Bridge Power MOS Module." IEEE Transactions on Power Electronics 22, no. 6 (November 2007): 2307–20. http://dx.doi.org/10.1109/tpel.2007.904203.

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