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

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A Study on the Modeling and Control method of PWM DC/DC Converter with Isolated two outputs (단일 2차측 권선을 이용한 이중 출력용 PWM DC/DC 컨버터의 모델링 및 Control 방법에 대한 연구)

  • Jang, Sang-Hyun;Lee, Dong-Yun;Choy, Ick;Song, Joong-Ho;Yoo, Ji-Yun
    • Proceedings of the KIEE Conference
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    • 2001.04a
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    • pp.195-197
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    • 2001
  • This paper presents the circuit modeling and Control methods of PWM DC/DC Converter with Isolated dual outputs. The dual output converter topology is consisted of the two switch and single secondary winding. The control algorithm which is used by an adjusted PI control methods, of Dual Output PWM DC/DC converter is proposed in this paper. The proposed adjusted PI control method has faster response characteristics than conventional PI control methods at load change. The validity of the proposed adjusted control method is verified with the several interesting simulation results.

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PWM-Based Sliding Mode Controller for Three-Level Full-Bridge DC-DC Converter that Eliminates Static Output Voltage Error

  • Liu, Jilong;Xiao, Fei;Ma, Weiming;Fan, Xuexin;Chen, Wei
    • Journal of Power Electronics
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    • v.15 no.2
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    • pp.378-388
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    • 2015
  • This paper proposes a pulse width modulation (PWM)-based sliding mode controller (SMC) for a full-bridge DC-DC converter that can eliminate static output voltage error. Hysteretic SMC in DC-DC converter does not have a fixed switching frequency, and applying hysteretic SMC to full-bridge converters is difficult. Fixed-frequency SMC, which is also called PWM-based SMC, based on equivalent control overcomes these shortcomings. However, the controller order reduction in equivalent control in PWM-based SMC causes static output voltage error. To resolve this issue, an integral item is added to the PWM-based SMC. Sliding mode coefficients are designed by applying a standard second-order system to the sliding mode surface. The effect of adding an integral item on the controller is analyzed, and an integral coefficient design method is proposed. Experiment results on a three-level full-bridge DC-DC converter verify the control scheme and design method proposed in this paper.

Feasibility Study of Tapped Inductor Filter Assisted Soft-Switching PWM DC-DC Power Converter

  • Moisseev S.;Sato S;Hamada S;Wakaoka M
    • Proceedings of the KIPE Conference
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    • 2003.07a
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    • pp.231-234
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    • 2003
  • This paper presents a novel high frequency transformer linked full-bridge type soft-switching phase-shift PWM control scheme DC-DC power converter, which can be used as power conditioner fur small-scale fuel cell power generation system. Using full-bridge soft-switching DC-DC converter topology makes possible to use low voltage high performance MOSFETs to achieve high efficiency of the power conditioner. A tapped inductor filter is implemented in the proposed soft-switching converter topology to achieve soft-switching PWM constant high frequency operation for a wide load variation range. to minimize circulating and idling currents without using additional resonant circuit and auxiliary power switching devices. The practical effectiveness of the proposed soft-switching DC-DC converter is verified in laboratory level experiment with 1 kW 100kHz breadboard setup using power MOSFETs. Actual efficiency of 94-96$\%$ is obtained for the wide load range

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A Switching Method for Minimizing the Over Current in Transient Response of 3-phase Interleaved Bidirectional DC-DC Converter with Frequency Modulation (주파수 변조 방식 3상 인터리브드 양방향 DC-DC 컨버터의 과도상태 과전류를 최소화하기 위한 스위칭 기법)

  • Bae, Jongwoo;Jeong, Hyesoo;Jung, Jae-Hun;Nho, Eui-Cheol
    • The Transactions of the Korean Institute of Power Electronics
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    • v.21 no.6
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    • pp.530-537
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    • 2016
  • This work deals with a switching method for minimizing overcurrent in a three-phase interleaved bidirectional DC-DC converter with frequency modulation. Generally, a three-phase interleaved DC-DC converter is used to reduce a current ripple component. The combined operation of three-phase and two-phase converters can significantly reduce the ripple component. However, the conventional PWM method cannot solve severe overcurrent during phase transfer or frequency variation for power control. To overcome this problem, this work proposes a new PWM switching method. A 3 kW DC-DC power converter is designed and implemented, and the converter is operated in discontinuous current mode with varying switching frequencies for power control. Simulation and experimental results show the validity of the proposed switching method. The proposed switching method can be widely used in the field of current ripple reduction for three-phase interleaved bidirectional DC-DC converters.

Digital-To-Phase-Shift PWM Circuit for High Power ZVS Full Bridge DC/DC Converter (대용랑 ZVS Full Bridge DC/DC 컨버터에 있어서 Digital-To-Phase Shift PWM 발생회로)

  • Kim, Eun-Su;Kim, Tae-Jin;Byeon, Yeong-Bok;Park, Sun-Gu;Kim, Yun-Ho;Lee, Jae-Hak
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.49 no.1
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    • pp.54-61
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    • 2000
  • Conventionally, ZVS FB DC/DC converter was controlled by monolithic IC UC3879, which includes the functions of oscillator, error amplifier and phase-shift circuit. Also, microprocessor and DSP have been widely used for the remote control and for the immediate waveform control in ZVS FB DC/DC converter. However the conventional microprocessor controller is complex and difficult to control because the controller consists of analog and digital parts. In the case of the control of FB DC/DC converter, the output is required of driving a direct signal to the switch drive circuits by the digital controller. So, this paper presents the method and realization of designing the digital-to-phase shift PWM circuit controlled by DSP (TMX320C32) in a 2,500A, 40㎾ ZVS FB DC/DC converter.

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Analysis of three-phase current type PWM converter using resonant DC Link snubber (공진 DC 링크 스너버를 이용한 3상 전류형 PWM 컨버터의 해석)

  • Kim, Young-Mun;Kang, Wook-Jung;Mun, Sang-Pil
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.52 no.2
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    • pp.49-55
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    • 2003
  • This paper presents a novel three-phase current-fed Pulse Width Modulation converter with switched capacitor type resonant DC link commutation circuit operating PWM pattern strategy under a design consideration of low-pass filter, which can operate on the basis of the principle of zero current soft switching commutation. In the first place, the steady state operating principle of this converter with a new resonant DC link snubber circuit is described in connection with the equivalent operation circuit, together with the practical design procedure of the switched-capacitor type resonant DC link circuit is discussed from a theoretical viewpoint on the basis of a design example for high-power applications. The actively delayed time correction method to compensate distorted currents due to a relatively long resonant commutation time is newly implemented in the open loop control scheme so as to acquire the new optimum PWM pattern. Finally, the experiment of set-up in laboratory system of this converter is concretely demonstrated herein to confirm a zero current soft-switching commutation of this converter. The comparative evaluations between current-fed hard switching PWM and soft-switching PWM converters are carried out from a viewpoint of their PWM converter characteristics.

A Wide Input Range, 95.4% Power Efficiency DC-DC Buck Converter with a Phase-Locked Loop in 0.18 ㎛ BCD

  • Kim, Hongjin;Park, Young-Jun;Park, Ju-Hyun;Ryu, Ho-Cheol;Pu, Young-Gun;Lee, Minjae;Hwang, Keumcheol;Yang, Younggoo;Lee, Kang-Yoon
    • Journal of Power Electronics
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    • v.16 no.6
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    • pp.2024-2034
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    • 2016
  • This paper presents a DC-DC buck converter with a Phase-Locked Loop (PLL) that can compensates for power efficiency degradation over a wide input range. Its switching frequency is kept at 2 MHz and the delay difference between the High side driver and the Low side driver can be minimized with respect to Process, Voltage and Temperature (PVT) variations by adopting the PLL. The operation mode of the proposed DC-DC buck converter is automatically changed to Pulse Width Modulation (PWM) or PWM frequency modes according to the load condition (heavy load or light load) while supporting a maximum load current of up to 1.2 A. The PWM frequency mode is used to extend the CCM region under the light load condition for the PWM operation. As a result, high efficiency can be achieved under the light load condition by the PWM frequency mode and the delay compensation with the PLL. The proposed DC-DC buck converter is fabricated with a $0.18{\mu}m$ BCD process, and the die area is $3.96mm^2$. It is implemented to have over a 90 % efficiency at an output voltage of 5 V when the input range is between 8 V and 20 V. As a result, the variation in the power efficiency is less than 1 % and the maximum efficiency of the proposed DC-DC buck converter with the PLL is 95.4 %.

Analysis of a FB-ZVS PWM DC/DC Converter for Electric Vehicles (전기자동차용 FB-ZVS PWM DC/DC 변환기의 해석)

  • Lee, Dong-Keun;Yoon, Duck-Yong;Hong, Soon-Chan
    • Proceedings of the KIEE Conference
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    • 1996.07a
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    • pp.461-463
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    • 1996
  • A FB-ZVS(Full Bridge Zero Voltage Switching) PWM DC/DC converter for electric vehicles is analyzed in this paper. The converter considered is a step-down DC/DC converter with the ratings of 3l2/I3.5V and 1.35kW. The steady state analysis of this converter is divided into six operating modes. Digital simulations using PSPICE are carried out to verify the steady-state analysis.

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2-stage 3-phase PWM AC/DC Converter for Unity Power Factor Drive of Synchronous Generator (단위역률동작을 위한 동기 발전기 여자 시스템용 2단 3상 PWM AC/DC 컨버터)

  • Lee, Sang-Hun;Kim, Tae-Hyoung;Lee, Dong-Hee;Ahn, Jin-Woo
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2007.05a
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    • pp.187-192
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    • 2007
  • The terminal voltage of a synchronous generator is maintained by the field current control of excitation system Generally AC/DC converter which is component of AVR(Automatic Voltage Regulator) system for excitation current control is connected to diode rectifier and DC/DC converter system In the case of diode rectifier system of phase controlled converter, AC/DC converter has low power factor and some low order harmonics in the line current. In this paper, two-stage three-phase PWM AC/DC converter is studied to solve these problems, The proposed method is verified by the computer simulations and experimental results in prototype generation system.

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Design of a PWM DC-DC Boost Converter with Adaptive Dead-Time Control Using a CMOS 0.18um Process (CMOS 0.18um 공정을 이용한 Dead-Time 적응제어 기능을 갖는 PWM DC-DC Boost 변환기 설계)

  • Hwang, In-Ho;Yoon, Eun-Jung;Park, Jong-Tae;Yu, Chong-Gun
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2012.10a
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    • pp.285-288
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    • 2012
  • Since the non-overlapping gate driver used in conventional DC-DC boost converters generates fixed dead-times, the converters suffer from the body-diode conduction loss or the charge-sharing loss. To reduce the efficiency degradation due to these losses, this paper presents a PWM DC-DC boost converter with adaptive dead-time control. In light loads, power switching is also employed to increase the efficiency. The designed DC-DC boost converter can thus achieve high efficiency at wide current range. The proposed DC-DC boost converter has 3.3V output from a 2.5V input with 0.18um technology. It operates at 500KHz and has a maximum power efficiency of 97.8%.

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