• 전자공학회논문지SC
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• 제45권4호
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• pp.60-67
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• 2008

본 연구에서는 일반적으로 용접기의 전원장치로 사용되어지는 풀-브리지 회로에 2개의 스위치와 2개의 무손실 스너버 부분 공진 커패시터, 2개의 다이오드로 구성된 간단한 액티브 보조 부분 공진 스너버를 추가한 새로운 하프 브리지 소프트 스위칭 PWM DC-DC 컨버터를 제안하였다. 제안한 하프 브리지 소프트 스위칭 DC-DC 컨버터 회로는 기존 회로의 DC 버스라인 스위치에 발생되는 도통 손실을 저감하여 고주파 변압기의 1차측의 전류가 2차측보다 작아지는 저 전압, 대전류 직류출력을 얻어 수 있었다. 그리고, 모든 영역에서 ZCS/ZVS 동작하므로써 저전압, 대전류 직류 출력의 스위칭 전원 장치에 있어 고주파, 고효율, 고출력을 실현할 수 있다. 이러한 모든 사항은 시뮬레이션과 실험 결과로부터 도출하였으며, 제안한 회로의 단점을 보완할 경우에는 차세대형 TIG MIG MAG 아크 용접기용 전원으로 용이할 것으로 판단된다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1996년도 하계학술대회 논문집 A
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• pp.392-394
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• 1996

This paper is to describe how to apply the Phase-shifted Full Bridge 100kHz high frequency soft-switching PWM method to 48[V], 200[A] DC/DC converter. The soft-switching is achieved from light load to full load by using phase-shifted zero voltage switching method with additional capacitors besides the MOSPET's of the right leg even though the leakage inductance of high frequency transformer is designed small. This method can reduce the switching tosses, EMI problems, and increase the effective duty. Also, this paper includes the simulation, analysis, and experiment results of the DC/DC converter unit.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2014년도 추계학술대회 논문집
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• pp.201-202
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• 2014

본 논문에서는 절연형 Dual Full-Bridge 양방향 DC-DC 컨버터의 손실 분석을 다루었다. 동일한 컨버터라 하더라도 스위칭 기법과 스위칭 주파수에 따라 손실이 다르게 나타나는데 여기서는 ZCS 가 되는 조건에서 스위칭 주파수를 10 [kHz] 로 하여 분석하였으며 계산결과가 실험결과와 거의 일치함을 확인하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1996년도 하계학술대회 논문집 A
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• pp.388-391
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• 1996

The conventional high frequency phase-shifted full bridge DC-DC converter has a disadavantage that a circulating current flows through transformer and switching devices during the freewheeling interval Due to this circulating current, RMS current stress, conduction losses of transformer and switching devices are increased. To alleviate this problem, this study provides a novel circulating current free type high frequency soft switching phase-shifted full bridge DC-DC converter which applies the energy recovery snubber(ERS) attached at the secondary side of transformer. The ERS adopted in this study is consisted of three fast recovery diode($Ds_1$, $Ds_2$, $Ds_3$), two resonant capacitor($Cs_1$, $Cs_2$) and a small resonant inductor [(Lr) : It can be ignored because the transformer leakage inductance(Ll) is able to use in stead of inserting the resonant inductor(Lr)]

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2005년도 춘계학술대회
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• pp.181-184
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• 2005

Operating conditions of photovoltaic power generator is very sensitive to the PV modules. The PV module's control is an importance issue in the removing DC ripple noise. In this paper, the phase-shifted-carrier technique, which is a new three-step dc-dc power multi-converter schemes, is applied to solar generator system to improve the output current waveform. The novel type of three-step dc-dc converter presented has many features such as the good output waveform, high efficiency, low switching losses, low acoustic noise. The circuit configuration is constructed by the conventional full-bridge type converter circuit using the isolated DC power supply for which the solar cell is very suitable. In the end, a circuit design for understanding three-step dc-dc converter and new solar power system were presented

• 전력전자학회논문지
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• 제19권1호
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• pp.23-30
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• 2014

This paper proposes a single power-conversion ac-dc converter with a dc-link capacitor-less and high power factor. The proposed converter is derived by integrating a full-bridge diode rectifier and a series-resonant active-clamp dc-dc converter. To obtain a high power factor without a power factor correction circuit, this paper proposes a suitable control algorithm for the proposed converter. The proposed converter provides single power-conversion by using the proposed control algorithm for both power factor correction and output control. Also, the active-clamp circuit clamps the surge voltage of switches and recycles the energy stored in the leakage inductance of the transformer. Moreover, it provides zero-voltage turn-on switching of the switches. Also, a series-resonant circuit of the output-voltage doubler removes the reverse-recovery problem of the output diodes. The proposed converter provides maximum power factor of 0.995 and maximum efficiency of 95.1% at the full-load. The operation principle of the converter is analyzed and verified. Experimental results for a 400W ac-dc converter at a constant switching frequency of 50kHz are obtained to show the performance of the proposed converter.

• 전기학회논문지P
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• 제63권3호
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• pp.125-130
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• 2014

This paper is research result for a development of solar cell silicon ingot glowing(SCSIG) PWM converter system for 120[kW] 3[kA]. The system include 3-phase AC-DC rectifier diode converter of input voltage AC 460[V] and 60[Hz], DC-AC single phase full bridge PWM inverter of high frequency, AC-DC single-phase full wave rectifier using center-tapped of transformer for low voltage 50[V] and large current 3,000[A], carbon resistor load 0.2 [$m{\Omega}$]. PWM switching frequency for IGBT inverter control set 15KHz. The suggested researching contents are designed data sheets of power converter system, PSIM simulation, operating characteristics and analysis results of developed SCSIG system.

• 조명전기설비학회논문지
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• 제28권11호
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• pp.33-41
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• 2014

This paper is research result for a development of sapphire silicon ingot glowing(SSIG) PWM converter system for 80kW 10kA. The system include 3-phase AC-DC diode rectifier of input voltage AC 380V and 60Hz, DC-AC single phase full bridge PWM inverter of high frequency, AC-DC single-phase full wave rectifier using center-tapped of transformer for low voltage 8.0V and large current 10,000A of output specification, tungsten resistor load 0.1[$m{\Omega}$]. PWM switching frequency for IGBT inverter control set 30kHz. The suggested researching contents are designed data sheets of power converter system, PSIM simulation, operating characteristics and analysis results of developed SSIG system. This paper propose

• 조명전기설비학회논문지
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• 제18권5호
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• pp.61-68
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• 2004

최근, 연료전지는 새로운 발전시스템으로 주목받고 있다. 연료전지는 저전압/대전류의 전기적 특성을 가진다. 그러므로 일반 상용부하에 적용하기 위해서는 승압용 컨버터와 인버터가 필요하다. 제안된 시스템은 연료전지의 전압을 380[Vdc]로 승압하기 위한 절연형 DC-DC 컨버터와 단상 220[Vac]로 변환하기 위한 LC 필터를 가진 PWM 인버터로 구성된다. 또한, 연료전지 발전시스템용 양방향 DC-DC 컨버터는 부하 응답 특성을 개선시키기 위하여 구성하였다. 본 논문에서는 풀 브리지 컨버터와 단상 인버터를 설계하고 제작하였으며, 시뮬레이션과 실험을 통해 연료전지 발전 시스템이 분산전원에 적용이 가능함을 보여준다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.281-283
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• 2006

This paper presents two new circuit topologies of DC bus lineside active edge resonant snubber assisted soft-switching PWM full-bridge DC-DC converter acceptable for either utility AC 200V-rms or AC 400V-rms input voltage source. All the active power switches in the full-bridge arms and DC busline can achieve ZCS turn-on and ZVS turn-off commutations and the total turn-off switching power losses of all active switches can be reduced for high-frequency switching action. The effectiveness of these new DC-DC converters topologies is proved for low voltage and large current high efficiency DC-DC power supplies as TIG arc welding machine from a practical point of view.