• 전력전자학회논문지
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• 제5권4호
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• pp.327-334
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• 2000

본 연구에서는 회로평균화 기법을 이용한 풀 브리지 컨버터의 회로모델을 제안하였다. 제안한 모델은 회로의 물리적 성격을 충분히 알 수 있으므로 대용램의 DC-DC 컨버터에 많이 사용되는 풀 브리지컨버터의 해석과 설계에 쉽게 적용할 수 있다. 제안한 모델을 적용하여 풀 브리지 컨버터의 안정도해석올 시뮬레이션을 통하여 수행하고, 부하의 변동이 단락에서 개방까지 극심한 아크 용접기의 주회로 설계에 적용히여 설치의 용접을 통하여 안정한 동작이 가능함을 확인하였다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 1998년도 전력전자학술대회 논문집
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• pp.401-404
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• 1998

This paper proposes a new soft switching single stage AC/DC full bridge converter with unit power factor and isolated output. This circuit shows that it is possible to combine the boost converter which is for PFC(Power Factor Correction) and full bridge converter which is for DC/DC converter. A simple auxiliary circuit which includes neither lossy components nor active switches eliminates ringing of secondary side of the transformer. The characteristics of the proposed circuit are investigated and the validity is verified by the simulation results.

• 조명전기설비학회논문지
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• 제25권8호
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• pp.20-29
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• 2011

This paper presents an improved phase-shift pulse-width modulation (PWM) full-bridge converter using a blocking capacitor. As the proposed converter reduces the circulation energy by inserting only one series blocking capacitor at the primary side of the conventional phase-shift PWM full-bridge converter structure, it improves the operation characteristics of the conventional converter. In this paper, first, the operation of conventional phase-shift PWM full-bridge converter is roughly reviewed, and then the operational principle of the proposed converter is classified and explained by each mode. After that, a prototype design example based on the operational principle is shown. Then, the improved operation characteristics of the proposed converter are actually verified through the experimental results.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2015년도 추계학술대회 논문집
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• pp.52-53
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• 2015

This paper introduces a novel hybrid converter combining a full-bridge soft switching converter and a full-bridge LLC converter. In this topology all the primary switches can achieve ZVS and ZCS all over the operation range. An additional switch and a diode are added in the secondary side of full-bridge converter to eliminate the circulating current and to provide a separate freewheeling path. The hybrid structure makes it possible to deliver the power to the secondary all the time of operation, thereby improving the efficiency. The proposed topology is suitable for the applications such as on-board chargers for electric vehicles and high power dc-dc converters. A 6.6-kW prototype converter was implemented and 97.5% efficiency was obtained through the experiments.

• 전력전자학회논문지
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• 제16권5호
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• pp.477-483
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• 2011

일반적인 DC/DC 전력변환기의 스위칭 방식은 하드 스위칭 방식과 공진을 이용한 소프트 스위칭 방식으로 분류할 수 있으며, 하드 스위칭 방식은 스위치의 턴 온/오프시 스위칭 소자에 생기는 전력손실이 커서 효율 면에서 불리하며, 공진형 소프트 스위칭 방식은 별도의 리액터와 커패시터를 추가함으로서 시스템의 사이즈와 비용이 증가하는 단점이 있다. 본 논문에서는 이러한 단점을 극복하기 위해 새로운 스위칭 방식의 소프트 스위칭 방식의 Full-bridge 전력변환기의 구조를 제안하였으며, 제안된 소프트 스위칭 방식은 앞단의 벅 컨버터의 다이오드 전류시 영전압이 되는 구간에서 Full-Bridge 컨버터의 스위치를 교변 함으로써 리액터와 커패시터의 추가없이 소프트 스위칭을 이루어냄으로서 시스템의 효율과 신뢰성을 향상시킨다. 또한 제안된 절연형 소프트 Full-bridge DC/DC 컨버터의 타당성을 검증하기 위해 Psim을 이용한 시뮬레이션과 500[W]급 DC/DC 컨버터를 제작하여 DC/DC 컨버터의 효율이 우수함을 확인하였다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2012년도 전력전자학술대회 논문집
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• pp.518-519
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• 2012

This paper suggested a fuel cell generation system which combined interleaved full-bridge converter with half-bridge inverter. High ratio step-up converter is essential to use the power as general voltage source. Full-bridge converter has high efficiency and can boost the input voltage to high output with transformer. With series connected capacitors, interleaved full-bridge converter and half-bridge inverter are combined. Half-bridge inverter has two fewer switches compared to full-bridge type. Also, switching loss can be reduced. The performance is verified through simulation with 1.5[kW] fuel cell generation system.

• 전력전자학회논문지
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• 제15권5호
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• pp.394-400
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• 2010

본 논문에서는 Buck Converter 동작 원리를 Full -Bridge Inverter에 적용한 전자식 안정기를 제안하였다. 전자식안정기는 EMI 필터, 수동 PFC, Full-Bridge Inverter로 2-stage로 구성되어 있다. PFC는 신뢰성 확보를 위해 수동 PFC를 사용하였다. Full-Bridge Inverter는 High Side와 Low Side 스위치의 구동 주파수를 각각 고주파와 저주파로 구동하여 Buck Converter의 동작을 구현 하였다. 램프를 저주파수 구형파로 구동하여 음향공명현상을 피하게 되었으며, 고주파수 스위칭으로 인덕터의 부피를 줄였다. 제안한 방법은 시뮬레이션과 실험을 통해 증명하였다.

• 전력전자학회논문지
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• 제25권6호
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• pp.425-432
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• 2020

The phase-shifted, full-bridge (PSFB) DC-DC converter is widely used in electric vehicles (EVs) to charge a low-voltage (12 V) battery from a high-voltage battery. A Photovoltaic (PV) module-integrated PSFB converter is proposed for the EV power conversion system. The converter is useful because solar energy can be utilized to extend the driving range. The buck converter circuit is simply realized by adding one switch to the conventional PSFB converter's secondary side. For the inductor and diode, the existing components in the PSFB converter are shared. The proposed converter can charge a low-voltage battery from the PV module with maximum power point tracking. In addition, the two power sources can be used simultaneously, and efficiency is increased by reducing the circulating current, which is a problem for the conventional PSFB converter.

• 전력전자학회논문지
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• 제20권3호
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• pp.280-289
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• 2015

A high-efficiency full-bridge DC-DC converter with a current-doubler rectifier and an asymmetric pulse-width modulation is proposed. Through the asymmetric pulse-width modulation, the proposed converter achieves zero-voltage switching of power switches without the circulating currents. The proposed converter reduces the output current ripple through the current-doubler rectifier. A control strategy is suggested for the proposed converter to charge battery banks. A constant current and constant voltage charging is performed. The proposed converter achieved a higher efficiency compared with the conventional full-bridge DC-DC converter with a phase-shift modulation. The performance of the proposed converter is evaluated by the experimental results for a 1.0 kW prototype circuit.

• 조명전기설비학회논문지
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• 제25권7호
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• pp.32-39
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• 2011

FPS(Filament Power Supply), one of the KSTAR NBI(Neutral Beam Injections) is implemented by full-bridge DC/DC converter. NBI heating device for KSTAR(1.5MW) is developed for heating an ion source of plasma in KSTAR tokmak. The full-bridge DC/DC converter is applied to FPS for isolation with input and output. And FPS is operated with PWM control method which is the most usual method. In this paper, NBI FPS of 4.8kW is simulated by using the PSIM 6.0. And the full-bridge DC/DC converter using IGBTs is fabricated to demonstrate it. The processor DSP 28335 is implemented for digital control.