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Digital Active Load Sharing Control of Paralleled Phase-Shifted Full-Bridge Converters
Hyun-Wook Seong(성현욱),Je-Hyung Cho(조제형),Gun-Woo Moon(문건우),Myung-Joong Youn(윤명중) 전력전자학회 2010 전력전자학술대회 논문집 Vol.2010 No.7
For the high power demand and N+1 redundancy, this paper presents the digital load share (LS) controller design and the implementation of paralleled phase-shifted full-bridge converters (PSFBC) used in distributed power systems. By adopting the digital control strategy, separately used ICs for PSFBC and LS control functions in analog systems can be merged into a costeffective digital controller. To compensate and stabilize both PSFBC and LS loops with the direct digital design approaches, small-signal model of the system is derived in discrete-time domain. The steady-state and dynamic load sharing performances are also investigated. Experimental results from two 1.2 ㎾ paralleled PSFBC modules are shown to verify the proposed work.
PFC 부스트 컨버터의 역률 및 고조파 왜율 개선을 위한 이득 조정 기법
김형석(Hyoung-Suk Kim),성현욱(Hyun-Wook Seong),이재범(Jae-Bum Lee),문건우(Gun-Woo Moon),윤명중(Myung-Joong Youn) 전력전자학회 2011 전력전자학술대회 논문집 Vol.2011 No.7
본 논문에서는 PFC 부스트 컨버터의 역률 및 고조파 왜율 개선을 위한 전류 제어기 이득 조정 기법을 제안한다. PFC단은 입력 전압의 변화에 따라 인덕터 전류의 크기가 달라져 부스트 인덕터의 인덕턴스가 변화하게 되어 전류 루프의 주파수 특성이 변화하게 된다. 이러한 현상으로 인한 전류 루프의 이득 변화를 분석하였다. 이를 기반으로 입력 전압에 따라 전류 제어기의 이득을 조정해 줌으로써, 충분한 위상마진을 확보함과 동시에 PF와 THD 성능을 개선한다. TI사의 TMS320F28027 MCU를 이용한 실험을 통해 제안된 기법의 유용성을 검증한다.
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.
이대우(Dae Woo, Lee),하태종(Tae Jong, Ha),강병구(Byung Goo, Kang),성현욱(Hyun Wook, Seong),곽무신(Moo Sin, Kwak) 한국자동차공학회 2023 한국자동차공학회 부문종합 학술대회 Vol.2023 No.5
Recently, automobiles are developing as a means of providing a living space to consumers beyond a simple means of transportation, and an essential requirement to achieve this development is an autonomous vehicle. Autonomous vehicles require 12 V power grid redundancy for system reliability, which means that power is supplied in parallel in a structure that previously supplied power to various controllers from a single power grid. The proposed system reduces the weight by changing the 12 V auxiliary battery used in the redundant power grid to a super-capacitor. In addition, to increase the efficiency, the secondary circuit of the low dc/dc converter(LDC) was applied as a synchronous rectifier switch, and a planar type integrated magnetic material was applied to improve the output density. Furthermore, it contributed to material cost reduction by replacing the pre-charging function required at startup by using the bidirectional operation of the proposed LDC.
ZVS Center-Tapped Half-Bridge Zeta Converter with Reduced Output Filter Inductor Size
Jae-Bum Lee(이재범),Ki-Bum Park(박기범),Hyoung-Suk Kim(김형석),Hyun-Wook Seong(성현욱),Gun-Woo Moon(문건우) 전력전자학회 2011 전력전자학술대회 논문집 Vol.2011 No.7
In this paper, a new half-bridge zeta converter employing a center-tapped rectifier is proposed. The proposed converter provides a bidirectional powering path in the rectifier. As a result, its improved rectifier voltage waveform reduces the output filter inductor size. Also, it maintains a wide ZVS range due to the characteristic of the conventional single-ended half-bridge zeta converter. The operational principles, the theoretical analysis, and the design considerations of the proposed converter are analyzed. To verify the performance of the proposed converter, experimental results from a 180W prototype are presented.