단일칩 마이컴을 이용한 위상변위 방식 풀브리지 직류-직류 전력변환기

정강률(Gang-Youl Jeong) 한국전기전자학회 2021 전기전자학회논문지 Vol.25 No.3

본 논문에서는 단일칩 마이컴을 이용한 위상변위 방식 직류-직류 전력변환기를 제안한다. 제안한 전력변환기의 1차측은 위상변위 방식에 의하여 단극성 펄스폭변조(unipolar PWM)로 동작하는 풀브리지 전력구조이며, 2차측은 4개의 다이오드로 구성된 풀브리지 전파정류기이다. 제안한 전력변환기의 제어는 단일칩 마이컴에 의해 수행되고, 그 MOSFET 스위치들은 부트스트랩 회로에 의해 구동된다. 그래서 전력변환기의 전체 시스템은 간단하다. 제안한 전력변환기는 공진회로와 저지커패시터를 이용하여 고효율을 달성한다. 본 논문에서는 먼저, 제안한 전력변환기의 전력회로의 동작을 각 동작모드를 따라 설명한다. 그리고 제안한 전력변환기의 전력회로 설계방식을 보이고 제안한 전력변환기를 동작시키는 마이컴 상의 소프트웨어 제어 알고리즘과 피드백 및 스위치 구동 회로에 관하여 간략히 설명한다. 그 후, 본 논문에서 제시한 설계와 구현방식에 의하여 설계하고 제작된 시제품 전력변환기의 실험결과를 통하여 제안한 전력변환기의 동작 특성을 입증한다. 실험결과에서 약 92%정도의 최고 효율을 얻었다. This paper presents the phase-shift full-bridge DC-DC converter using the one-chip micom. The proposed converter primary is the full-bridge power topology that operates with the unipolar pulse-width modulation (PWM) by the phase-shift method, and the secondary is the full-bridge full-wave rectifier composed of four diodes. The control of proposed converter is performed by the one-chip micom and its MOSFET switches are driven by the bootstrap circuit. Thus the total system of proposed converter is simple. The proposed converter achieves high-efficiency using the resonant circuit and blocking capacitor. In this paper, first, the power-circuit operation of proposed converter is explained according to each operation mode. And the power-circuit design method of proposed converter is shown, and the software control algorithm on the micom and the feedback and switch drive circuits operating the proposed converter are described, briefly. Then, the operation characteristics of proposed converter are validated through the experimental results of a designed and implemented prototype converter by the shown design and implementation method in this paper. The highest efficiency in the results was about 92%.

Phase-shifted full-bridge converter with coupled-inductor-based rectifier

Choi, Byoung-Gi,Lee, Woo-Seok,Park, Jeong-Uk,Lee, Il-Oun The Korean Institute of Power Electronics 2021 JOURNAL OF POWER ELECTRONICS Vol.21 No.10

In this paper, a phase-shifted full-bridge (PSFB) converter with a coupled-inductor-based rectifier is presented. The proposed PSFB converter alleviates the circulating-current problem of conventional PSFB converters. As a result, it can operate with a larger effective duty-cycle over a wide range of input voltage or output load conditions. The transformer turn-ratio can be better designed in terms of the primary-side conduction loss and the secondary-rectifier voltage stress. Due to the reduced secondary voltage stress, diodes with a lower forward-voltage drop can be used in the rectifier of the proposed converter, which results in s reduction of the secondary-side conduction and snubber losses. With these advantages, the proposed converter can achieve a higher power-conversion efficiency when compared to conventional converters. To verify the effectiveness of the proposed converter, this paper presents the operating principle, dc analysis, and experimental results of a prototype converter built with the specification of a 1.0 kW, 300-400 V input, a 50 V output, and a 100 kHz switching frequency.

Full-bridge resonant converter with hybrid control for wide input voltage range applications

Zhou, Yufei,He, Xin'an,Sheng, Lunhui The Korean Institute of Power Electronics 2021 JOURNAL OF POWER ELECTRONICS Vol.21 No.1

This paper proposes a hybrid control strategy for a full-bridge resonant converter. In the applications with a wide input voltage, a resonant converter with variable frequency control (VFC) has to modulate the converter operating in a wide switching frequency range to satisfy gain requirements, which results in some problems such as difficulty in optimizing the design of magnetic components, increased power loss and deteriorated electromagnetic interference. By use of VFC, primary-side phase shift control and secondary-side phase shift control, the frequency variable range can be greatly reduced and the conversion efficiency can be increased, which make the converter appropriate for a wide input voltage range. With this hybrid control strategy, the converter can automatically convert to the corresponding control mode according to variations of the input voltage and load, which has a good transient performance. The working principle, gain characteristics and design considerations of a hybrid controlled CLL resonant converter are introduced in detail. Experimental results are shown to demonstrate its validity and feasibility.

홀드 업 타임 보상회로를 가진 IT 기기용 Front-end PSFB DC/DC 컨버터

이강현 전력전자학회 2013 전력전자학회 논문지 Vol.18 No.5

A hold-up time compensation circuit is proposed to get high efficiency of the front-end phase-shifted full bridge DC/DC converter. The proposed circuit can make the phase-shifted full bridge front-end DC/DC converter built with 0.5 duty ratio so that the conduction loss of the primary side and voltage stress across rectifier in the secondary side are reduced and the higher efficiency can be obtained. Furthermore, the requirement of an output filter significantly can diminish due to the perfect filtered waveform. A 12V/100A prototype has been made and experimental results are given to verify the theoretic analysis and detailed features.

Enhanced Models for Current-Mode Controllers of the Phase-Shifted Full Bridge Converter with Current Doubler Rectifier

M. R. Ahmed,X. Wei,Y. Li 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5

Enhanced behavioural models are proposed in this paper for the peak-current-mode (PCM) and average-current-mode (ACM) control of the phase-shifted full bridge (PSFB) converter with a current doubler rectifier. Detailed small-signal analysis of the converter is presented considering the parasitics associated with the passive components. The models enabled the design of a robust digital current-mode closed-loop controller for the converter. The converter has been designed for automotive high voltage to low voltage DC-DC converter applications and has strict transient response requirements. All the enhanced open-loop transfer functions derived using small-signal analysis of the converter are validated using LTspice simulations. The closed-loop controller models are also simulated in MATLAB Simulink to optimise the designs of the compensators for both ACM and PCM closed-loop controls. Detailed transient-response analysis of the converter also verifies the effectiveness of the enhanced models which are significantly faster than the conventional models.

Phase-Shifted Full-Bridge Converter with an Improved Coupled Inductor Rectifier

Jae-Hyun Ahn,Jae-Kuk Kim 전력전자학회 2023 ICPE(ISPE)논문집 Vol.2023 No.-

A phase-shifted full-bridge (PSFB) converter with coupled inductor rectifier (CIR) structure has the advantage that eliminate freewheeling current in the primary side of the PSFB converter. However, during freewheeling period, the output current flows through high-voltage-rated diodes, resulting in large conduction loss. Also, the converter should be designed with a small magnetizing inductance to achieve zero-voltage switching (ZVS) for the lagging-leg switches, resulting in increased transformer loss. This article proposes a modified PSFB converter to mitigate the drawbacks of the conventional CIR PSFB converter. By employing two diodes in the secondary side, the output current is transferred to the primary side during the freewheeling period, facilitating ZVS for the lagging-leg switches. Moreover, the output current during the freewheeling period flows through the low-voltage-rated diodes. Therefore, the proposed converter achieves high efficiency. The performance of the proposed converter was verified using prototypes with 320-400-V input and 56-V/700-W output specifications.

Phase-Shifted Full Bridge(PSFB) DC/DC Converter with a Hold-up Time Compensation Circuit for Information Technology (IT) Devices

Kang-Hyun Yi(이강현) 전력전자학회 2013 전력전자학회 논문지 Vol.18 No.5

A hold-up time compensation circuit is proposed to get high efficiency of the front-end phase-shifted full bridge DC/DC converter. The proposed circuit can make the phase-shifted full bridge front-end DC/DC converter built with 0.5 duty ratio so that the conduction loss of the primary side and voltage stress across rectifier in the secondary side are reduced and the higher efficiency can be obtained. Furthermore, the requirement of an output filter significantly can diminish due to the perfect filtered waveform. A 12V/100A prototype has been made and experimental results are given to verify the theoretic analysis and detailed features.

A Reconfigurable Phase-Shift Full-Bridge Converter for the Wide Output Voltage EV Charging Application

Dingsihao Lyu,Thiago Batista Soeiro,Pavol Bauer 전력전자학회 2023 ICPE(ISPE)논문집 Vol.2023 No.-

This paper proposes a new phase-shift full-bridge (PSFB) DC/DC converter with a reconfigurable secondary side for the wide output voltage range Electric Vehicle (EV) charging application. This converter features a two-secondary-windings transformer and two auxiliary switches. Its rectifying stage can be configured into a full-bridge rectifier when the output voltage is high or as a center-tapped rectifier when the output voltage is low. As a result, the efficiency of the proposed converter at low output voltage can be significantly improved compared to the conventional PSFB converter, making it suitable for the wide output voltage range EV charging application. This paper presents the steady state analytical modeling of the proposed converter, which is verified by circuit simulations. The loss comparison between the proposed converter and the conventional PSFB converter designed for the EV charging application is presented, and the efficiency improvement is for the proposed converter.

연료전지 발전시스템에 적용된 고주파 절연형 ZVZCS PS-PWM DC-DC 컨버터의 설계 및 특성 해석

서기영,문상필,김동헌,이현우,권순걸,Suh, Ki-Young,Mun, Sang-Pil,Kim, Dong-Hun,Lee, Hyun-Woo,Kwon, Soon-Kurl 한국조명전기설비학회 2006 조명·전기설비학회논문지 Vol.20 No.4

본 논문에서는 Ballard사의 1.2[kW]급 연료전지와 연료전지의 저전압($28{\sim}43[VDC]$)을 승압(380([VDC])시키기 위한 풀-브리지 직류-직류 컨버터, 그리고 승압된 직류 링크전압을 교류 전압(220[VAC]), 60[Hz]으로 변환하기 위한 단상 풀-브리지 인버터로 구성된 연료전지 발전용 전력변환시스템 중 풀-브리지 고주파 절연형 영전압 영전류 스위칭 위상 천이 펄스폭 변조 직류-직류 컨버터를 제안하였다. 제안한 풀-브리지 고주파 절연형 영전압 영전류 스위칭 위상 천이 펄스폭 변조 직류-직류는 프리휠링 다이오드를 포함한 탭부 인덕터 필터를 이용하여 순환 전류를 저감시켰으며, 스위치 및 변압기의 턴-온, 턴-오프시에 오버슈트 전압이나 과도현상이 발생하지 않는다. 그리고 넓은 출력 전압 조정에도 효율을 $93{\sim}97[%]$정도 얻을 수 있으며, 출력 부하전류의 변화에 대해 거의 일정한 출력 전압 특성을 가졌다. In this paper, the proposed full-bridge high frequency isolated zoo voltage and zero current switching phase shifted pulse width modulation(ZVZCS PS-PWM)DC-DC converter among fuel cell generation system consist of 1.2[kW] fuel cell of Nexa Power Module, full-bridge DC-DC converter to boost the fuel cell low voltage($28{\sim}43[%]$) to 380[VDC] and a single phase full-bridge inverter is implemented to produce AC output(220[VAC], 60[Hz]). A tapped inductor filter with freewheeling diode is newly implemented in the output filter of the proposed full-bridge high frequency isolated ZVZCS PS-PWM DC-DC converter to suppress circulating current under the wide output voltage regulation range, thus to eliminate the switching and transformer turn-on/off over-short voltage or transient phenomena. Besides the efficiency of $93{\sim}97[%]$ is obtained over the wide output voltage regulation ranges and load variations.

위상 천이 풀-브릿지 컨버터를 위한 새로운 전압 진동 제거 기술

박기범,김정은,문건우,윤명중 전력전자학회 2005 전력전자학회 논문지 Vol.10 No.6

Conventional phase shift full bridge (PSFB) converter has serious voltage oscillation problem across the secondary rectifier diodes, which would require the dissipate snubber circuit, thus degrades the overall efficiency. To overcome this problem, a new simple voltage oscillation reduction technique (VORT) which effectively reduce the voltage oscillation of the secondary rectifier diodes for phase shift full bridge converter is proposed. Therefore, no dissipate snubber for rectifier diodes is needed. In addition, since it has wide zero voltage switching (ZVS) range, high efficiency can be achieved. Operational principle, analysis of voltage oscillation, and design consideration are presented compare with that of the conventional PSFB converter. To confirm the validity of the proposed VORT, experimental results from a 420W prototype are presented. 기존의 위상 천이 풀-브릿지 컨버터는 변압기 2차측 다이오드의 전압 스트레스를 증가시키는 심각한 전압 진동 문제를 가지고 있으며, 이를 해결하기 위한 부가적인 스너버의 사용은 전체 시스템 효율의 저하를 초래한다. 본 논문에서는 부가적인 스너버의 사용없이 효과적으로 전압 진동 문제를 해결하는 위상 천이 풀-브릿지 컨버터의 새로운 동작 방식을 제안한다. 또한 제안된 방법은 동작 특성 상 넓은 영전압 스위칭 범위를 보장하므로 향상된 효율을 기대할 수 있다. 기존의 동작 방식과 비교하여 제안된 전압 진동 제거 기술의 동작 원리, 전압 진동 분석 및 설계 고려 사항을 나타내었으며, 420W사양의 시험모델을 제작하여 제안된 전압 진동 제거 기술의 타당성을 입증하였다.