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Li, Nan. "Digital control strategies for DC/DC SEPIC converters towards integration." Phd thesis, INSA de Lyon, 2012. http://tel.archives-ouvertes.fr/tel-00760064.
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The use of SMPS (Switched mode power supply) in embedded systems is continuously increasing. The technological requirements of these systems include simultaneously a very good voltage regulation and a strong compactness of components. SEPIC ( Single-Ended Primary Inductor Converter) is a DC/DC switching converter which possesses several advantages with regard to the other classical converters. Due to the difficulty in control of its 4th-order and non linear property, it is still not well-exploited. The objective of this work is the development of successful strategies of control for a SEPIC converter on one hand and on the other hand the effective implementation of the control algorithm developed for embedded applications (FPGA, ASIC) where the constraints of Silicon surface and the loss reduction factor are important. To do it, two non linear controls and two observers of states and load have been studied: a control and an observer based on the principle of sliding mode, a deadbeat predictive control and an Extended Kalman observer. The implementation of both control laws and the Extended Kalman observer are implemented in FPGA. An 11-bit digital PWM has been developed by combining a 4-bit Δ-Σ modulation, a 4-bit segmented DCM (Digital Clock Management) phase-shift and a 3-bit counter-comparator. All the proposed approaches are experimentally validated and constitute a good base for the integration of embedded switching mode converters
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Dasari, Anuroop Reddy. "The steady-state analysis of the non-isolated and isolated type SEPIC PWM DC-DC converters for CCM." Wright State University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=wright1599672947653384.
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Chotikorn, Nattapong. "Implementations of Fuzzy Adaptive Dynamic Programming Controls on DC to DC Converters." Thesis, University of North Texas, 2019. https://digital.library.unt.edu/ark:/67531/metadc1505139/.
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DC to DC converters stabilize the voltage obtained from voltage sources such as solar power system, wind energy sources, wave energy sources, rectified voltage from alternators, and so forth. Hence, the need for improving its control algorithm is inevitable. Many algorithms are applied to DC to DC converters. This thesis designs fuzzy adaptive dynamic programming (Fuzzy ADP) algorithm. Also, this thesis implements both adaptive dynamic programming (ADP) and Fuzzy ADP on DC to DC converters to observe the performance of the output voltage trajectories.
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Jaafar, Ali. "Contribution à la modélisation, l'analyse et l'optimisation de lois de commande pour convertisseurs DC-DC de puissance." Phd thesis, Supélec, 2011. http://tel.archives-ouvertes.fr/tel-00644419.
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L'utilisation des convertisseurs de puissance pour des applications de la vie quotidienne devient de plus en plus importante. Les applications technologiques actuelles demandent simultanément un haut niveau de précision et de performance, ainsi les convertisseurs DC-DC ont un rôle très important dans les systèmes nécessitant la conversion et l'adaptation du niveau d'énergie. Nous nous intéressons dans le cadre des travaux de cette thèse à une analyse des approches de modélisation et de synthèse de loi de commande permettant d'assurer la stabilité et un certain niveau de performances dans l'ensemble du domaine de fonctionnement défini par un cahier des charges tout en prenant en compte la problématique de leur application dans un environnement industriel. L'objectif de nos travaux de recherche est donc de proposer des lois de commandes dont la synthèse est fondée sur une approche formalisé {modélisation + commande} en vue d'obtenir des lois de commande adaptées au point de fonctionnement. Les principes exploités sont fondés sur la commande et l'observation par modes glissants d'une part, et sur la théorie de passivité pour la synthèse des lois de commande, complétées par un couple {observateur d'état + estimateur de charge} dont la synthèse est fondée sur l'exploitation des principes d'immersion et invariance, d'autre part. Le souci de la validation expérimentale et de l'implantation des structures de commande avec du matériel disponible industriellement a été en permanence un fil conducteur. Pour démontrer l'efficacité des méthodes proposées, leur application expérimentale a été effectuée sur un convertisseur de type SEPIC. Ce convertisseur présente plusieurs avantages par rapport à autres convertisseurs. Cependant, il reste peu exploité, en dépit de ces avantages, en raison des difficultés pour obtenir des lois commande performantes permettant la stabilisation de sa tension de sortie dans tout l'ensemble du domaine de fonctionnement.
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Yilmaz, Hasan. "Design, Application And Comparison Of Single Stage Flybackand Sepic Pfc Ac/dc Converters For Power Led Lighting Application." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12615097/index.pdf.
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In this work, single stage power factor corrected AC/DC converters for LEDssingle stage Flyback converter having different configuration from the traditional Flyback and single stage SEPIC converter is investigated. The study involves analysis, circuit design, performance comparisons and implementation. The study covers LEDs
their developments, characteristics and state-of-art in this new technology. The circuits are investigated by means of computer simulations. Operating principles and operating modes are studied along with design calculations. After applying prototypes in laboratory, the simulation results and theoretical analyses are confirmed. The single stage Flyback converter has high voltage input (220-240 Vac), and the output feeds up to 216 HB-LEDs, with the ratings of 24 V, 3.25 A with 90 W. The single stage SEPIC converter with universal input (80-265 Vac) has an output that feeds 21 power LEDs, with 67 V, 0.30 and 20 W ratings.
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Costa, Neto Antônio de Oliveira. "Análise e Desenvolvimento de um Retificador Trifásico de 12 Pulsos com Autotransformador e Conversores SEPIC Isolados." Universidade Federal de Uberlândia, 2018. http://dx.doi.org/10.14393/ufu.di.2018.179.
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CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível SuperiorCom o constante aumento de componentes eletrônicos inseridos nas diversas áreas da eletrônica na atualidade, torna-se evidente a preocupação de elevados distúrbios harmônicos de corrente na qualidade da energia. Este trabalho tem a finalidade de abordar uma das alternativas para reduzir esse problema, desenvolvendo um retificador de 12 pulsos com dois conversores CC-CC SEPIC de 500 W em cada retificador, com isolação galvânica, operando em condução contínua e com elevado fator de potência e baixa distorção harmônica na corrente de entrada do retificador. A utilização do autotransformador contribui na diminuição do peso e volume da estrutura, sendo a isolação feita no estágio intermediário de alta frequência. A conexão entre a carga e o retificador de múltiplos pulsos convencionalmente é feita a partir da utilização de transformadores especiais de interfase. Entretanto, eles possuem um projeto complexo e, ainda peso e volume consideráveis. Por isso, esses transformadores especiais são substituídos por conversores estáticos, os quais garantem o equilíbrio entre cada grupo retificador e conseguem regular a tensão de saída. Essa estrutura pode ser utilizada em diversas aplicações dentre elas, no acionamento de máquinas elétricas, em carregadores de bateria e dentro de aeronaves, exercendo funções antes comandadas por mecanismos hidráulicos, pneumáticos e mecânicos, aumentando a confiabilidade do processo. Este trabalho aborda detalhadamente o desenvolvimento de duas estratégias de controle, com o objetivo de equilibrar o processamento de potência entre cada módulo e regular a tensão de saída. Foram obtidos os resultados computacionais, e experimentais através da construção de um protótipo.
With the constant increase of electronic components inserted in the diverse areas of electronics at the present time, it becomes evident a concern of harmonic disturbances of current in the quality of the energy. This work has the purpose of addressing one of the alternatives to reduce this problem, developed a 12-pulse rectifier with two DC-DC SEPIC converters of 500 W in each rectifier, with galvanic isolation, operating in continuous conduction and with high power factor and low harmonic distortion in the rectifier input current. The use of the autotransformer contributes to the reduction of the weight and volume of the structure, being an insulation made on the intermediate stage of high frequency. The connection between a load and the multi-pulse rectifier is conventionally made from the use of special interface transformers. They include a complex design and still have considerable weight and volume. Therefore, these special transformers are replaced by the static converters, which guarantee the balance between each rectifier group and obtain regular output voltage. This structure can be used in a variety of applications, such as driving electric machines, battery chargers and aircraft, performing functions previously controlled by hydraulic, pneumatic and mechanical mechanisms, increasing the reliability of the process. This work presents in detail the development of two control strategies, with the objective of balancing the power processing between each module and regulating the output voltage. The computational and experimental results were obtained through the construction of a prototype.
Dissertação (Mestrado)
7
Kovář, Jan. "Metody pro řešení spínaných obvodů." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-233575.
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The dissertation deals with simulations of the DC-DC converters in their basic configurations (Buck, Boost, Buck-boost, Cuk, SEPIC). In the first part of the thesis derivation of transfer functions Line-to-Output (LTO) and Control-To-Output (CTO) can be found. These symbolic responses are derived for three types of basic converters (Buck, Boost, Buck-boost) using well-known average model [1]. Derived expressions are very complicated. For reduction of these expressions symbolic approximation method was used, however the generality is lost. The average model was used to for decreasing the computational effort of analysis of DC-DC converters in the time domain. For these simulations VHDL-AMS language was used. The main topic of the thesis is harmonic balance method, which was adapted to DC-DC converters. Because conditions and assumptions for LTO and CTO functions are very different, harmonic balance method was derived into two variants. For obtaining of LTO response, duty cycle of switching signal can be considered as constant in time. Spectrum of this signal is simple as follows from well-known sinc function. For obtaining of CTO response PWM modulation must be used. Compared to sinc function spectrum of PWM modulation is richer (contains more combination frequencies). Many types of PWM modulation is described in [31]. For simulation PWM modulation with uniform sampling in two variants (single and double edge) was used. Non-ideal switching of PWM switch was modeled by PWM pulse with defined slew rate. Last section deals with comparison of all derived functions (LTO, CTO, modulation type, defined slew rate) with well-known averaged model.
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Kou, Martin. "Energy Harvesting from Elliptical Machines: DC-DC Converter Design Using SEPIC Topology." DigitalCommons@CalPoly, 2012. https://digitalcommons.calpoly.edu/theses/753.
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Cal Poly’s ongoing Energy Harvesting from Exercise Machines (EHFEM) project is a very convenient and cost-effective way for generating DC power from physical exercise and sending it back to the electrical grid as AC power, providing a renewable energy source for the future. The EHFEM project consists of numerous subprojects involving converting different types of exercise machines for power generation. This project is a continuation of one of the previous subprojects, specifically involving an elliptical machine, and focuses on improving system functionality at different machine settings without altering the elliptical user’s experience by selecting a new DC-DC converter design, while keeping the other system components intact. The new proposed DC-DC converter design is based on a non-isolated, PWM-switching single-ended primary inductor converter (SEPIC) topology, as opposed to the resonant zero-current switching/zero-voltage switching (ZCS/ZVS) topology-based off-the-shelf DC-DC converter that the previous project utilized, which had poor system functionality at high physical input levels (greater than 30V input) from the elliptical trainer. This project proves that a PWM-switching SEPIC topology provides a functional DC-DC converter design for DC power generation and inverter interfacing from a dynamic input voltage generator because of its wide input voltage range, high power driving capability and inherent voltage step-up and step-down functions. The proposed DC-DC converter supplies up to 288 watts of power and outputs 36 volts, and simultaneously takes 5-65 volts from its input depending on the elliptical user’s physical input level. This project details the new DC-DC converter’s design and construction processes, compares its topology to other existing DC-DC converter topologies and analyzes unfeasible designs as well as the overall system’s performance when converting the generated DC power to AC power, and documents any potential problems when used for this specific application.
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Nathan, Kumaran Saenthan. "A novel DC-DC converter for photovoltaic applications." Thesis, University of Cambridge, 2019. https://www.repository.cam.ac.uk/handle/1810/288881.
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Growing concerns about climate change have led to the world experiencing an unprecedented push towards renewable energy. Economic drivers and government policies mean that small, distributed forms of generation, like solar photovoltaics, will play a large role in our transition to a clean energy future. In this thesis, a novel DC-DC converter known as the Coupled Inductors Combined Cuk-SEPIC' (CI-CCS) converter is explored, which is particularly attractive for these photovoltaic applications. A topological modification is investigated which provides several benefits, including increased power density, efficiency, and operational advantages for solar energy conversion. The converter, which is based on the combination of the Cuk and SEPIC converters, provides a bipolar output (i.e. both positive and negative voltages). This converter also offers both step-up and step-down capabilities with a continuous input current, and uses only a single, ground-referenced switching device. A significant enhancement to this converter is proposed: magnetic coupling of the converter's three inductors. This can substantially reduce the CI-CCS converter's input current ripple - an important benefit for maximum power point tracking (MPPT) in photovoltaic applications. The effect of this coupling is examined theoretically, and optimisations are performed - both analytically and in simulations - to inform the design of a 4 kW prototype CI-CCS converter, switched at a high frequency (100 kHz) with a silicon carbide (SiC) MOSFET. Simulation and experimental results are then presented to demonstrate the CI-CCS converter's operation and highlight the benefits of coupling its inductors. An efficiency analysis is also undertaken and its sources of losses are quantified. The converter is subsequently integrated into a domestic photovoltaic system to provide a practical demonstration of its suitability for such applications. MPPT is integrated into the CI-CCS DC-DC converter, and a combined half bridge/T-type converter is developed and paired with the CI-CCS converter to form an entirely transformerless single-phase solar energy conversion system. The combination of the CI-CCS converter's bipolar DC output with the combined half bridge/T-type converter's bipolar DC input allows grounding at both the photovoltaic panels and the AC grid's neutral point. This eliminates high frequency common mode voltages from the PV array, which in turn prevents leakage currents. The entire system can be operated in grid-connected mode - where the objective is to maximise power extracted from the photovoltaic system, and is demonstrated in stand-alone mode - where the objective is to match solar generation with the load's power demands.
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Pospíšil, Josef. "Vývoj a ověření DC/DC měniče pro budoucí automobilové osvětlovací systémy s palubním napětím 48V." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2018. http://www.nusl.cz/ntk/nusl-377150.
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The aim of this master thesis is to describe the requirements put on electronics and headlights within car industry, above all on the newly emerging 48V power network. In the thesis the principles of chosen DC/DC buck converter topologies are briefly described. In the next part of this thesis the converters are designed and manufactured. Further, the EMC chamber measurement of these converters and their subsequent evaluation is performed. In the last part the proposed converters are compared and evaluated.
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Vičar, Ondřej. "Systém napájení s vysokou účinností pro mobilní zařízení." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-221158.
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This Master’s thesis is focused on design of voltage converter’s system operating with supply voltage of batteries. There are selected appropriate types of batteries, converter topologies and modes of their control. The specified output branches are systematically divided into three separate modules. Each module is designed in detail with focus on high efficiency. The modules are implemented and optimized. Parameter of final modules were measured and compared with correctness of design and theoretical assumptions.
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Loup, Martin. "Modely stejnosměrných tranzistorových měničů v programu Simulink." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2020. http://www.nusl.cz/ntk/nusl-412975.
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The master’s thesis is focused on the creation of models of DC/DC converters and control program for input parameters and their configuration. The first part is theoretical and she is dedicated to the description of the program Matlab. The second chapter is dedicated to DC/DC converters. Their function is described there and the necessary equations for the design are derived. All of this is complemented by the calculation of line losses in semiconductor elements and the design of voltage and current regulator. The last two parts deal with the description of the created models in Simulink and control program in a graphical environment. The created program is able to edit and recalculate parameters of the converters, calculate line losses on semiconductor components, perform a model simulation or open it.
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Sedláček, Michal. "Regulovatelný zdroj napájený a řízený pomocí USB." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-220090.
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Master thesis deals with design controllable switching power source. Device is supplied and controlled via USB bus of PC. The required output parameters are specified by user in a computer application. The teoretical part includes method of USB communication and introduction to switching power sources with focus on a Sepic topologii. The practical part describe individual circuit solution which contains of a complete device. Is analyzed in detail the proposal Sepic converter circuit and controling by microcontroller. The work also includes the design of microcontroller and computer applications. The result of this thesis is a functional device on which is the performed measurement.
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Chen, Jia-Bin, and 陳嘉斌. "Analysis and Design of Interleaved SEPIC AC-DC Converters." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/88926731816033535884.
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碩士國立成功大學
電機工程學系碩博士班
96
In this thesis, interleaved SEPIC ac-dc converters are analyzed and designed. Since the SEPIC converter provides a positive-polarity regulated output voltage with respect to the common terminal of the input voltage, the SEPIC converter applied as a power factor corrector become feasible. Interleaving control is achieved by the time-shift between two SEPIC converter to supply more power to the load. The topologies of typical and interleaved SEPIC are discussed, and the operating principles and design process are also studied in the thesis. Finally, a laboratory prototype of a 400 W interleaved SEPIC ac-dc converter is implemented to verify its feasibility and characteristics.
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Huang, Gwo-Jiun, and 黃國鈞. "Modeling and Implementation of a Novel Three-phase Sepic-type AC/DC Converters." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/22346602978756115671.
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Tsai, Bing-Shiun, and 蔡秉勳. "A High Step-Up DC-DC Converter using the Integrated Boost-Sepic -Forward Converter." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/68121523645256319175.
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碩士國立高雄應用科技大學
電機工程系博碩士班
101
In this thesis, a novel high step-up boost converter with non-isolator type is proposed. This circuit topology of the proposed converter is composed of three conventional converters: boost, sepic and forward converters with cascade connect such that a high step-up voltage gain with an appropriate duty ratio can be obtained. Besides, the converter has the advantages that the leakage inductance energy can be recycled, and the voltage stress and power loss can be reduced with a passive voltage clamp characteristic. In addition, the reverse-recovery problem of the diode is alleviated. It can be applied to renewable energy systems. The operating principles and steady-state analysis of the converter are presented. Finally, an experimental prototype with 24~36 V input and 200 V/ 150 W output is implemented to verify the theoretical analysis of the proposed converter. The maximum efficiency of 93.8% is reached; the full load efficiency remains at 90.2%.
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Ku, Chen-Hsuan, and 古振玄. "A Study of Bi-directional Energy Transfer Sepic-Flyback DC-DC Converter." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/34258735292731805863.
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碩士國立臺灣海洋大學
電機工程學系
94
Abstract The thesis is regarded to the research in Sepic-Flyback converter of bi-directional energy transfer based on continuous mode. The framework of Sepic-Flyback converter is a buck-boost of segregation to achieve power transfer by utilizing a magnetizing inductance and a coupling capacitance. The emphasis of the design of the circuit is the combination of Sepic converter and Flyback converter. There must be applicable gap in the transformer core to prevent saturation and balance DC component. The circuit control adopts open loop to gain excellent voltage adjustment and the research of bi-directional energy transfer Sepic-Flyback DC-DC converter with the output voltage and the power is 160V and 150W.
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Zhao, Ruichen. "A multiple-input single ended primary inductor converter for modular micro-grids with hybrid low-power sources." Thesis, 2010. http://hdl.handle.net/2152/ETD-UT-2010-05-1160.
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This thesis studies a multiple-input single ended primary inductor converter (MI SEPIC) topology. The configuration allows the integration of different low-power distributed generation sources, such as individual photovoltaic modules, fuel cells, and small residential wind generators, into a common dc main bus. The current source interface allows the integration of all types of sources without the addition of filters; sources that require a nearly constant input current, such as fuel cells. In addition to discussing the circuit’s main models and operation, the thesis evaluates the stability under a decentralized PI control scheme through small signal analysis. The analysis is verified with simulations and experiments with prototypes. A derived circuit topology, the isolated MI SEPIC, is also explored here. In addition, a nonlinear control scheme, Lyapunov-based control, is implemented to stabilize an MI SEPIC.text
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Chou, Yin-hsuan, and 周寅瑄. "Analysis and Design of a Current-Sensorless Synchronous Rectification Power Factor Correction SEPIC Converter Applying to Brushless DC Motors." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/40113108826944328553.
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碩士國立雲林科技大學
電機工程系碩士班
101
This thesis presented a current-sensorless synchronous rectification PFC SEPIC converter applying to the brushless DC motors. To simplify control and improve efficiency, a PFC SEPIC converter with no current sensor but with synchronous rectification is proposed. Through the relationship of the input voltage and output voltage, the duty ratio of the synchronous rectifier switch can be calculated without any current sensing elements and cost can be reduced. In order to avoid the conduction time overlap of the main switch and the synchronous rectifier switch, the charging time causing by the parasitic capacitor of the switch has to be estimated. After calculation, a register of digital-control-chip was set and the signal is outputted correctly at the right timing. In general, the analog control chip used dual-slope integrator including RC elements to estimate the rise time and fall time to implement a current-sensorless synchronous rectification SEPIC converter. However, the analog control circuit applied to the power factor correction topology might not be able to respond correctly with the default RC elements. Digital control chip could solve this response problem. There are two advantages which were saving the analog-control-chip and simplifying the topology of the control circuit when the control of the front stage converter and control of the end stage BLDC motor were combined in the same digital-control-chip. Two modulation control methods "PWM" (Pulse Width Modulation) and "PAM" (Pulse Amplitude Modulation) were used in the motor control. When the speed was between 5500 and 10000 rpm, the digital-control-chip would set automatically into "constant voltage mode", which applying PWM method and VO is kept at 165V. On the other side, when the speed was between 2500 and 5500 rpm, the digital-control-chip would set automatically into "constant duty mode", which applying PAM method and VO is kept between 70 and 165V. The interface of control was DSP TMS32028335 of Texas Instruments.