• Title/Summary/Keyword: PWM DC-DC converter

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Boost-Half Bridge Single Power Stage Configured PWM DC-DC Converter for Residential PEFC Stack Interface.

  • Khairy, Fathy;Choi, Kwang-Ju;Lee, Hyun-Woo;Mutsuo, Nakaoka
    • Proceedings of the KIEE Conference
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    • 2006.10d
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    • pp.132-134
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    • 2006
  • This paper presents the design and implementation of 1 kW prototype DC-DC power converter with bridge voltage-doubler suitable for small scale PEM fuel cell system and its associated control scheme. The operation principle of this converter is described using some operating waveforms and the switching mode equivalent circuits based on simulation results and a detailed circuit operation analysis and soft-switching conditions.

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Unity Power Factor Control for A Single Phase AC/DC PWM Converter (단상 AC/DC PWM 변환기의 단위 역률 제어)

  • Kang, Dong-Woo;Cha, Young-Kil;Lee, Deuk-Kee;Kim, Heung-Geun
    • Proceedings of the KIEE Conference
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    • 1996.11a
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    • pp.373-377
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    • 1996
  • Recently, active power factor control for AC/DC converter has been required to replace for a conventional diode rectifier. A voltage type AC/DC converter is widely used to obtain higher regulated DC voltage than input voltage with a unity power factor and a sinusoidal line current. This paper describes several active power factor control method for AC/DC converter. The analysis of several active power factor control is given. The simulations for hysteresis control, peak current control. constant frequency control and average current mode control are represented and compared.

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Simultaneous Control of DC-DC Converter by DSP Digital Controller (DSP 디지털 제어기법에 의한 DC-DC 컨버터의 동시제어)

  • Park, Hyo-Sik;Kim, Hui-Jun
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.50 no.12
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    • pp.609-614
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    • 2001
  • This paper presents a multi output converter system that controls, simultaneously and independently, the separate Buck converter and Boost converter with the different specification by one DSP digital controller. As two separate converters are regulated by only one DSP, it is possible to achieve the simple digital control circuit for regulating multi output DC-DC converter. By setting the software switch state, PI and Fuzzy controller can be applied as a controller for each converter without any change of hardware. Also, it is included the control characteristics comparison between PI and Fuzzy controller. The control characteristics of each PWM DC-DC converter is validated by experimental results.

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Comparisom of Control Algorithm for Simultaneous Control of DC-DC Converter (DC-DC 컨버터 동시제어의 제어 알고리즘 비교)

  • Park, Hyo-Sik;Han, Woo-Yong;Lee, Gong-Hee
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.51 no.4
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    • pp.163-168
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    • 2002
  • This paper presents the comparison results of control algorithm for the simultaneous control of a multi output converter system that controls, simultaneously and independently, the separate Buck converter and Boost converter with the different specification by one DSP digital controller. As two separate converters are regulated by only one DSP, it is possible to achieve the simple digital control circuit for regulating the multi output DC-DC converter. By setting the software switch state, PI and Fuzzy controller can be applied as a controller for each converter without any change of hardware. Also, it is included the control characteristics comparison between PI and Fuzzy controller. The control characteristics of each PWM DC-DC converter is validated by experimental results.

DSP(TMS320C40) Control of Three-phase PWM AC/DC Converter (TMS320C40을 이용한 3상 PWM AC/DC 컨버터 제어)

  • Byun, Young-Bok;Kim, Eun-Soo;Koo, Heun-Hoi;Joe, Kee-Yeon;Park, Sung-Jun;Kim, Cheul-U
    • Proceedings of the KIEE Conference
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    • 1996.07a
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    • pp.518-520
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    • 1996
  • High frequency switching converters are becoming more popular because of several benefits which are essential in power conversion system. This paper introduces a high speed digital controller using TMS320C40 DSP chip which can be used for high frequency switching converters and demonstrates its performance by operating three-phase PWM AC/DC converter with unity power factor at 20kHz sampling frequency. TMS320C40 DSP chip operates with 40-ns instruction cycle times and is capable of 275 MOPS. The running time of real time control loop at the three-phase PWM AC/DC converter is $44.6{\mu}sec$.

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The High Power Factor Control of a Single Phase PWM Converter using a Reduced-Order Luenberger Observer (축소차원 Luenberger 관측기를 이용한 단상 PWM 컨버터의 고역률 제어)

  • Yang, Lee-U;Kim, Yeong-Seok
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.49 no.8
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    • pp.529-535
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    • 2000
  • In this paper, a current control system of a single phase PWM AC/DC converter using a reduced-order Luenberger observer without source voltage sensors is proposed. The sinusoidal input current and unity input power factor are realised based on the estimated source voltage performed by the reduced-order Luenberger observer using actual currents and DC link voltage. The poles of the reduced-order Luenberger observer are placed in the left half plane of s-plane by the pole-placement method in order to acquire the stability of the observer. The magnitude and the phase of the estimated source voltage are used to accomplish the unity power factor. The proposed method is implemented by DSP(Digital Signal Processor). Experimental Results verify that the reduced-order observer estimates the source voltage without the estimation error and the control system accomplishes the unity power factor, and constant DC link voltage.

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A Study on the 300KHz ZVS Full Bridge PWM Converter (300KHz ZVS Full Bridge PWM 컨버터에 관한 연구)

  • 주형준;김의찬;최재동;손승찬;성세진
    • Proceedings of the KIPE Conference
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    • 1997.07a
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    • pp.111-115
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    • 1997
  • This Paper is concerned on developing DC-DC converter using ZVS-FB-PWM Converter. The converter output is 28V and regulated by phase shift control methode. MOSFET is used by the main switching device and high frequency transfomer is made for operating at 300㎑ switching frequency. When the load vary widely, converter's ZVS characteristic is expressed by experiment result.

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A Study on Efficiency Improvement of F-B Converter with Phase-shifted control method (위상이동 제어 방식을 이용한 풀브리지 컨버터의 효율개선에 관한 연구)

  • Suh, Jai-Kwang;Kim, Yong;Baek, Soo-Hyun;Kwan, Soon-Do
    • Proceedings of the KIEE Conference
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    • 1999.07f
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    • pp.2685-2687
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    • 1999
  • This paper is concerned on developing DC-DC converter. In contrast to resonant converter, this converter requires no external resonant elements and operates with constant switching frequency. In conventional PWM converter, two MOSFET switches of the converter are simultaneously turned on and turned off. In presented converter, to achieve Zero Voltage Switching, the two legs of the bridge are operated DC-DC converter is phase shifted. Phase shifted Full Bridge ZVS PWM Converter have an effect on the power system. Operation principle and features are illustrated by the experiment results from 50W, 250kHz with MOSFET switch.

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Design and Control Methods of Bidirectional DC-DC Converter for the Optimal DC-Link Voltage of PMSM Drive

  • Kim, Tae-Hoon;Lee, Jung-Hyo;Won, Chung-Yuen
    • Journal of Electrical Engineering and Technology
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    • v.9 no.6
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    • pp.1944-1953
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    • 2014
  • This paper shows the design and control methods of the bidirectional DC-DC converter to generate the proper DC-link voltage of a PMSM drive. Conventionally, because the controllable power of the PWM based voltage source inverter is limited by its DC-link voltage, the DC-DC converter is used for boosted DC-link voltage if the inverter source cannot generate enough operating voltage for the PMSM drive. In this paper, to obtain more utilization of this DC-DC converter, optimal DC-link voltage control for PMSM drive will be explained. First, the process and current path of the DC-DC converter will be illustrated, and a control method of this converter for variable DC-link voltage will then be explained. Finally, an improvement analysis of the optimal DC-link voltage control method, especially on the deadtime effect, will be explained. The DC-DC converter of the proposed control method is verified by the experiments by comparing with the conventional constant voltage control method.

A Novel Variable-Speed Renewable-Energy Generation System of Induction Generator and PWM Converter for Small-Scale Hybrid Power Applications

  • Ahmed, Tarek;Nishida, Katsumi;Lee, Hyun-Woo;Nakaoka, Mutsuo
    • Proceedings of the KIEE Conference
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    • 2005.07b
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    • pp.1339-1342
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    • 2005
  • This paper presents a simple AC-DC power conditioner for a squirell-cage induction generator(IG) operating under variable shaft speeds. The necessary reactive power for the IG system is supplied by means of a capacitor bank and a voltage-source PWM converter. Using a capacitor bank to transfer the reactive power to the IG under the rated speed and no-load conditions starts the IG operation and reduces the PWM power converter size. A simple control compensating for changes in the electrical loads as well as the variation in speed was developed to regulate the voltages of the IG system by controlling the rotor flux through its reactive and active currents control implementation. This proposed power conditioning scheme can be used efficiently as a wind power generation system where the output voltage of the IG is maintained constant voltage despite the variable frequency and the DC bus voltage of the PWM converter can be used for either DC applications such as battery charging or AC power applications with 60/50 Hz by connecting a stand alone inverter. The experimental and simulated operating performance results of a 5 kW IG scheme at various speeds and leads are presented.

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