• Journal of Power Electronics
• /
• 제6권1호
• /
• pp.45-51
• /
• 2006

A new high efficiency phase shifted full bridge (PSFB) converter for the power sustaining module of a plasma display panel (PDP) is proposed in this paper. The proposed converter employs a voltage doubler rectifier without an output inductor. Since it has no output inductor, the voltage stresses of the secondary rectifier diodes can be clamped at the output voltage level. No dissipative resistor-capacitor (RC) snubber for rectifier diodes is needed. Therefore, high efficiency, as well as, a low noise output voltage can be realized. Due to the elimination of the large output inductor, it features a simple structure, lower cost, smaller mass and lighter weight. Furthermore, the proposed converter has wide zero voltage switching (ZVS) ranges with low current stresses of the primary switches. Also the resonance between the leakage inductor of the transformer and the capacitor of the voltage doubler cell reduces the current stresses of the rectifier diodes. In this paper, operational principles, an analysis of the proposed converter and experimental results are presented.

• 전기학회논문지P
• /
• 제60권1호
• /
• pp.48-52
• /
• 2011

Over the years, traditionally, six-switch three-phase inverters have been widely utilized for variable speed alternating current motor drives. Recently, some efforts have been made on the application of four-switch three phase inverter for uninterruptible power supply and variable speed drives. This is due to some advantages of the four-switch three phase inverter over the conventional six-switch three-phase inverters such as reduced price due to reduction in number of switches, reduced switching losses, reduced number of interface circuits to supply logic signals for the switches, simpler control algorithms to generate logic signals, less chances of destroying the switches due to lesser interaction among switches, and less real-time computational burden. However such as slow di/dt and speed limitation, are the inherent characteristics and main drawbacks of the four-switch configuration. Those problems can be overcome in conjugation with Voltage-doublers which has additional advantage, such as unity power factor correction.

• 전력전자학회:학술대회논문집
• /
• 전력전자학회 2005년도 전력전자학술대회 논문집
• /
• pp.445-448
• /
• 2005

PDP 유지전원단을 위한 고효율을 갖는 새로운 페이지 쉬프트 풀브릿지 컨버터를 제안한다. 제안된 컨버터는 Rectifier로 Voltage Doubler를 사용함으로서, 큰 사이즈의 Output Inductor가 없게 되어 간단한 구조를 가지게 되며 Rectifier Diodes의 전압 스트레스가 출력전압으로 클램핑되어서 스너버회로가 필요없다는 장점을 가지게 된다. 또한 넓은 영전압 스위칭 구간을 가지며, 트랜스포머의 기생성분인 Leakage 인덕터와 Voltage doubler의 캐패시터간의 공진을 이용함으로서 전류가 작은 RMS값을 가지게 되어서 낮은 도통손실과 Rectifier Diode의 전류 스트레스 또한 낮다는 장점을 가지게 된다. 본 논문을 통해 제안된 컨버터의 동작원리와 해석, 실험을 수행하였다.

• Journal of Power Electronics
• /
• 제18권1호
• /
• pp.34-44
• /
• 2018

This paper presents a pulse-width adjustment (PWA) strategy for a novel bidirectional DC-DC boost converter to improve the performance of the dynamic inductor current response. This novel converter consists of three main components: a full-bridge converter (FBC), a high-frequency isolated transformer with large leakage inductance, and a three-level voltage-doubler rectifier (VDR). A number of scholars have analyzed the principles, such as the soft-switching performance and high-efficiency characteristic, of this converter based on pulse-width modulation plus phase-shift (PPS) control. It turns out that this converter is suitable for energy storage applications and exhibits good performance. However, the dynamic inductor current response processes of control variable adjustment is not analyzed in this converter. In fact, dc component may occur in the inductor current during its dynamic response process, which can influence the stability and reliability of the converter system. The dynamic responses under different operating modes of a conventional feedforward control are discussed in this paper. And a PWA strategy is proposed to enhance the dynamic inductor current response performance of the converter. This paper gives a detailed design and implementation of the PWA strategy. The proposed strategy is verified through a series of simulation and experimental results.

• 전력전자학회:학술대회논문집
• /
• 전력전자학회 2010년도 하계학술대회 논문집
• /
• pp.142-143
• /
• 2010

An active-clamped current-fed half-bridge converter for the high step-up application is proposed in this paper. The proposed converter is composed of active clamping snubber circuits and a voltage doubler rectifier. The operational principle, theoretical analysis, and design considerations are presented. To confirm the operation, features, and validity of the proposed circuit, the experimental result for a 200W, 24V input and 400V output prototype are presented.

• Journal of Electrical Engineering and Technology
• /
• 제9권6호
• /
• pp.2224-2236
• /
• 2014

The performance of an isolated high voltage full bridge converter is improved using a voltage doubler. In a conventional high voltage full bridge converter, the diode of the transformer secondary voltage undergoes a voltage spike due to the leakage inductance of the transformer and the resonance occurring with the parasitic capacitance of the diode. In addition, in the phase shift control, conduction loss largely increases from the freewheeling mode because of the circulating current. The efficiency of the converter is thus reduced. However, in the proposed converter, the high voltage dual converter consists of a voltage doubler because the circulating current of the converter is reduced to increase efficiency. On the other hand, in the proposed converter, an input current is distributed when using parallel input / serial output and the output voltage can be doubled. However, the voltages in the 2 serial DC links might be unbalanced due to line impedance, passive and active components impedance, and sensor error. Considering these problems, DC injection is performed due to the complementary operations of half bridge inverters as well as the disadvantage of the unbalance in the DC link. Therefore, the serial output of the converter needs to control the balance of the algorithm. In this paper, the performance of the conventional converter is improved and a balance control algorithm is proposed for the proposed converter. Also, the system of the 1.5[kW] PCS is verified through an experiment examining the operation and stability.

• 전자공학회논문지SC
• /
• 제39권5호
• /
• pp.43-50
• /
• 2002

다이오드 정류회로의 전류 파형을 향상시키기 위해서 배전압 다이오드 정류회로에 대한 새로운 동작원리를 제안하였다. 기존의 배전압 정류회로는 대용량 캐패시터를 이용하여 출력전압을 높였으나 제안한 회로는 소용량의 캐패시터와 리액터를 이용하기 때문에 출력전압은 높아지지 않지만 입력전류의 파형을 개선할 수 있다. 그리고 역률과 효율이 각각 97[%], 98[%]을 얻을 수 있다. 제안한 정류기는 고조파 규제값과 스위치가 서로 영향을 미치지 않고 다이오드와 인덕터 그리고 콘덴서로 구성된 비선형 임피턴스 회로이다. 또한 일반적인 펄스 폭 변조 인버터와 하프 펄스 폭 변조 인버터를 비교하여 설명하였으며 제안된 하프 펄스 폭 변조 인버터에 의해서 낮은 스위칭 손실과 오버슈팅을 제어할 수 있다.

• 전력전자학회논문지
• /
• 제16권6호
• /
• pp.561-568
• /
• 2011

본 논문은 단상 이중변환 무정전전원장치를 위한 단일 스위치 배전압 방식의 단상 PFC 컨버터의 동작 특성을 기술한다. 단일 스위치 배전압 방식의 단상 PFC 컨버터는 브릿지 다이오드와 양방향 능동 스위치 한 개만이 필요하며 재료비 절감이 가능하다. 하지만 이 회로가 제안된 후 동작 특성 및 제어기 설계에 대한 연구결과가 알려지지 않았다. 본 논문에서는 동작 특성과 제어기 설계방법을 기술하고 성능평가를 위해 단상 정격 3kVA 이중변환 무정전전원장치를 대상으로 실험을 수행하였다. 또한 실험을 통해 입력전류 제어, 입력역률 보상 성능을 확인하였다.

• 전력전자학회논문지
• /
• 제17권3호
• /
• pp.230-237
• /
• 2012

This paper proposes an active-clamp ac-dc converter with direct power conversion that has a simple structure and achieves high efficiency. The proposed converter is derived by integrating the step-down ac chopper and the output-voltage doubler. The proposed converter provides direct ac-dc conversion and dc output voltage without using any full-bridge diode rectifier. The step-down ac chopper using an active-clamp mechanism serves to clamp the voltage spike across the main switches and provides zero-voltage turn-on switching. The resonant-current path formed by the leakage inductance of the transformer and the resonant capacitor of the output-voltage doubler achieves the zero-current turn-off switching of the output diodes. The operation principle of the converter is analyzed and verified. A 500W prototype is implemented to show the performance of the proposed converter. The prototype provides maximum efficiency of 95.1% at the full load.

• 전력전자학회:학술대회논문집
• /
• 전력전자학회 2003년도 춘계전력전자학술대회 논문집(1)
• /
• pp.85-88
• /
• 2003

In this Paper, we report the experimental results of the Forward-flyback U-U converter with current doubler and synchronous rectifier. The experimental converter, that has a output voltage 3.3V, output current 20A, maximum power of 66W, switching frequency of 290kHz and input voltage range of 36-75V, has been successfully implemented. As a result, in the entire voltage range the measured full load efficiency was above 85$\%$, and the output voltage was regulated at 3.3V within $\pm3{\%}$ tolerance.