Current Controller Design of a Phase Shift Full Bridge Converter for High Current Applications with Inductive Load

Tat-Thang Le(레덧탕),Min-Won Park(박민원),In-Kun Yu(유인근) 한국산업정보학회 2018 한국산업정보학회논문지 Vol.23 No.1

본 논문에서는 유도성 부하를 가지는 위상 변위 풀 브릿지 컨버터(PSFB)의 성능과 다양한 유도성 부하를 갖는 출력 전류의 동적 응답을 향상시키는 새로운 전류 제어 기법을 제안하였다. 누설 인덕턴스 및 유도성 부하를 포함하는 향상된 동적 모델을 사용하였으며, 유도 부하의 변화에 대한 영향을 상세히 분석하였다. 제안된 전류 제어 방식은 위상 여유 사양을 기반으로 설계하였다. 결과적으로 제안된 전류 제어 기법은 기존의 전류 제어 기법과 비교하여 동적 응답을 개선시킬 수 있음을 확인하였다. 설계된 컨트롤러의 성능은 500 A PSFB 컨버터 시스템을 통하여 검증하였다. 이 결과는 초전도 장치와 같이 유도성 부하가 큰 고 전류 애플리케이션에 활용할 수 있다. This paper presents the performance of a Phase Shift Full Bridge (PSFB) converter with inductive load and a new current control scheme to improve dynamic response of output current with various inductive loads. Enhanced dynamic model is used which includes leakage inductance and inductive load. Effect of changing of inductive load was analyzed in detail. Proposed current control scheme is designed based on phase margin specifications. As a result, the proposed current control scheme helps to improve the dynamic response in comparison with the existing current control scheme. The performance of the designed controller is verified by a 500 A PSFB converter. The results will be utilized for high current applications with high inductive load such as superconducting devices.

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.

Wide Range ZVS Phase Shift Full Bridge Converter with Low Conduction Loss

Young-Do Kim,Kyu-Min Cho,Duk-You Kim,Byoung-Hee Lee,Chol-Ho Kim,Gun-Woo Moon 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5

The conventional phase shift full bridge (PSFB) converter is widely used for front-end DC/DC stage of distributed power system (DPS). However, hold-up time requirement limits its operating duty ratio in normal operation and it results in the increase of conduction loss in conventional PSFB converter. Therefore, wide range ZVS PSFB converter with low conduction loss is proposed in this paper. The proposed converter adopts the large resonant inductor and replaces clamp diodes in conventional PSFB converter with MOSFET switches. With this modification, the proposed converter can achieve the ZVS operation over wide load range as well as can reduce the conduction loss of switches caused by the circulating current. There advantages result in the improvement of whole load efficiency. The operational principle and analysis of proposed converter are presented and verified by the 1.2㎾ prototype.

Calculation of Leakage Inductance of Integrated Magnetic Transformer with Separated Secondary Winding Used in ZVS PSFB Converter

Tian Jiashen,Zhang Yiming,Ren Xiguo,Wang Xuhong,Tao Haijun 한국자기학회 2016 Journal of Magnetics Vol.21 No.4

A novel zero voltage switching (ZVS) phase shift full bridge (PSFB) converter used in geophysical exploration is proposed in this paper. To extend the ZVS ranges and increase power density of the converter, external inductor acting as leakage inductance is applied and integrated into the integrated magnetic (IM) transformer with separated secondary winding. Moreover, the loss of ZVS PSFB converter is also decreased. Besides, the analysis and accurate prediction methodology of the leakage inductance of the IM transformer are proposed, which are based on magnetic energy and Lebedev. Finally, to verify the accuracy of analysis and methodology, the experimental and finite element analysis (FEA) results of IM transformer and 40 kW converter prototypes are given.

ZVS 위상천이 풀브릿지 컨버터의 디지털 샘플링 기법에 따른 소신호 모델 분석

김정우(Jeong-Woo Kim),조영훈(Younghoon Cho),최규하(Gyu-Ha Choe) 전력전자학회 2015 전력전자학회 논문지 Vol.20 No.2

This study describes how digital time delay deteriorates control performance in zero voltage switching (ZVS) phase-shifted full bridge (PSFB) converter. The small-signal model of the ZVS PSFB converter is derived from the buck-converter small-signal model. Digital time delay effects have been considered according to the digital sampling methods. The analysis verifies that digital time delays reduce the stability margin of the converter, and the double sampling technique exhibits better performance than the single sampling technique. Both simulation and experimental results based on 250 W ZVS PSFB confirm the validity of the analyses performed in the study.

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.

Dead-Time for Zero-Voltage-Switching in Battery Chargers with the Phase-Shifted Full-Bridge Topology

Taizhi Zhang,Junyu Fu,Qinsong Qian,Weifeng Sun,Shengli Lu 전력전자학회 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.2

This paper presents a comprehensive theoretical analysis and an accurate calculation method of the dead-time required to achieve zero-voltage-switching (ZVS) in a battery charger with the phase-shifted full-bridge (PSFB) topology. Compared to previous studies, this is the first time that the effects of nonlinear output filter inductance, varied Miller Plateau length, and blocking capacitors have been considered. It has been found that the output filter inductance and the Miller Plateau have a significant influence on the dead-time for ZVS when the load current varies a lot in battery charger applications. In addition, the blocking capacitor, which is widely used to prevent saturation, reduces the circulating current and consequently affects the setting of the dead-time. In consideration of these effects, accurate analytical equations of the dead-time range for ZVS are deduced. Experimental results from a 1.5kW PSFB battery charger prototype shows that, with the proposed analysis, an optimal dead-time can be selected to meet the specific requirements of a system while achieving ZVS over wide load range.

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.

New Two-Transformer Phase-Shift Full-Bridge Converter With Low Conduction Loss

Seok-Woo Jeong,Seung-Hoon Lee,Jae-Kuk Kim 전력전자학회 2023 ICPE(ISPE)논문집 Vol.2023 No.-

A two-transformer phase-shift full-bridge (PSFB) converter has features of zero-voltage switching (ZVS) capability, clamped voltage stress of the primary switches. However, when a wide input voltage range is required, the two-transformer PSFB converter operates with extended freewheeling mode. In addition, a large freewheeling current is reflected on the primary side, which causes a large circulating current. As a result, the freewheeling current flows through high voltage rating diodes, resulting in a large conduction loss. To overcome this problem, a new two-transformer phase-shift full-bridge converter with low conduction loss is proposed in this paper. By employing a diode which has a low voltage stress in the secondary side, the proposed converter eliminates the circulating current in the primary side. As a result, the proposed converter reduces the primary and secondary conduction loss. The effectiveness and feasibility were verified with a 300-400 V input and 12 V/400 W output prototype.

위상천이 풀브릿지 컨버터의 경부하 효율 증대를 위한 동기정류기 제어

이선호(Sun Ho, Lee),성현욱(Hyun Wook, Seong),곽무신(Moo Sin, Kwak) 한국자동차공학회 2023 한국자동차공학회 부문종합 학술대회 Vol.2023 No.5

Recently, phase-shifted full-bridge(PSFB) converter is widely used in the low voltage DC/DC converter (LDC) of hybrid electric vehicles(HEVs) and electric vehicles(EVs) due to its advantages such as high power density and high efficiency under the medium-to-high load conditions. Although, PSFB converter with SR has a drawback of low efficiency under the light-load conditions due to the negative SR current which increases the core loss of main transformer. To figure it out, several researches that making the converter operate in the discontinuous conduction mode(DCM) under the light-load conditions have been developed, but those increase the body-diode conduction loss. To deal with this, the proposed SR control eliminates the body-diode conduction loss so that it can significantly improve the light-load efficiency. Furthermore, it can be easily implemented with cost-effective digital controller without auxiliary circuits.