• 전력전자학회:학술대회논문집
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• 전력전자학회 2003년도 춘계전력전자학술대회 논문집(1)
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• pp.36-39
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• 2003

The push pull forward converter is a very suitable circuit for low output voltage, high output current applications with a wide input voltage range. All the magnetic components (output inductor, transformer, input filter) can be integrated into a single core. The integrated magnetics can reduce the number of the magnetic components. Developed the push pull forward converter rating are of 36 $\~$72V input and 3.3V/30A output. In this converter, the efficiency was measured by $76.4\%$ at full load and 82.95$\%$ at full load. The maximum efficiency is up to 83.$\%$ at 200kHz switching frequency, l1A output.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 하계학술대회 논문집 B
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• pp.900-902
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• 2000

A moving-coil-type linear oscillatory actuator is consisted of the NdFeB permanent magnets with high specific energy as the stator, a coil-wrapped nonmagnetic hollow rectangular structure and an iron core as a pathway for magnetic flux. The inductance of moving coil and the push/pull effect is obtained from the permeance model of LOA with the open magnetic circuit. The analytical method are verified using the 2D finite element method.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 1999년도 학술대회논문집-국제 전기방전 및 플라즈마 심포지엄 Proceedings of 1999 KIIEE Annual Conference-International Symposium of Electrical Discharge and Plasma
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• pp.189-194
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• 1999

This paper proposes a current-fed type high frequency inverter using a soft switching technology Zero-Voltage-Switching to reduce turn on and off loss at the switching. The analysis of the proposed circuit was described by using normalized parameter and operating characteristics have been evaluated as to switching frequency and parameters. The theoretical results are in good agreement with the experimental ones. In the future the proposed circuit is considered to be useful for induction heating applications.

• 전력전자학회논문지
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• 제10권6호
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• pp.592-597
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• 2005

푸시 풀 포워드 컨버터는 넓은 입력범위에서 저전압 대전류 특성이 좋고 싱글 EI-EE 코어에 출력 인덕터와 변압기 그리고 입력 필터 등 모든 자성소자들을 포함시킴으로써 집적화할 수 있다. 회로의 여러 변수들에 대한 효율 비교를 통해서 집적화된 싱글 코어 푸시 풀 포워드 컨버터에 대해 고찰하였다. 푸시 풀 포워드 컨버터의 변압기는 Nicera사의 5M FEE 18/8/10C와 NC-2H FEI32/8/10C 코어를 이용하였다. 컨버터의 정격은 입력 전압 $36\~72V$이며 출력은 3.3V, 30A이다. NC-2H FEI32/8/10C코어를 사용하였을 경우 스위칭 주파수가 200kHz이고 부하가 11A일 때 $83.5\%$의 최고 효율이 측정되었다. 전부하(full load)시의 효율은 $76.4\%$, 반부하(half load)일 경우에는 $82.95\%$의 효율이 각각 측정 됐다.

• 한국수소및신에너지학회논문집
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• 제19권5호
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• pp.417-422
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• 2008

In this paper, a novel DC/DC low-voltage high-current converter circuit is proposed to improve the efficiency of power converter used in the grid-connected fuel-cell generator system. We proposed a novel high efficiency grid-connected power conditioning system for RPG fuel cell. On the result of that, the loss of system was decreased rapidly by driving stack within the condition of maximum efficiency. The peak currents of the current-type inductor and the transformer's coil are reduced by synchronizing switching frequency of Buck-type converter is increased twice as the Push-Pull converter's switching frequency. The novel structure of DC/DC converter is able to realize ZVS-ZCS in fuel-cell system is proposed. The proposed switching component of Push-Pull converter has the ZVS and ZCS function by using the circuit of new passive clamp.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2000년도 전력전자학술대회 논문집
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• pp.489-492
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• 2000

A novel low-cost simple and unity-power-factor electronic ballast is presented. The proposed electronic ballast employs a bypassing capacitor and load networks composed of ballast capacitors and small charge pump capacitors as power factor correction circuit combined with the secondary winding of the transformer in the self-excited current-fed push-pull resonant inverter(CF-PPRI) resulting in cost-effectiveness and higher efficiency. By analyzing the principles of power factor correction mathematically optimum design guidelines are presented. Since the lamps are used in power factor correction stage the input power is automatically adjusted according to the number of the lamps.

• 전기학회논문지
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• 제61권3호
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• pp.401-406
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• 2012

The aim of this research is to develop more actual high-frequency power generators that includes various noise, to make flexible control systems for test or performance analysis of electric and electronic machines. It proposed power generating circuits using basic amplifier, B-level Push-Pull type, and FPGA for the easier control to get data and transmit. And it also testify to realize the proposed systems to report output data by input waveform and designed the digital LPF with MATLAB, universal simulation tools, for this study.

• 전력전자학회:학술대회논문집
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• 전력전자학회 1998년도 전력전자학술대회 논문집
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• pp.20-23
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• 1998

An improved current-fed push-pull PWM converter with integrated magnetics is presented. With this improved topology, the design of magnetic elements such as an inductor and a transformer becomes easier than that using the conventional topology, especially when the converter is suffered from an extremely high input current. Since this gives twice the voltage conversion ratio compared to the conventional one, it is also suited for the high voltage step-up power conversion process. The operation of the proposed converter is thoroughly analyzed. Also, the theoretical analysis and experimental results are taken from the laboratory level prototype.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1995년도 하계학술대회 논문집 A
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• pp.368-370
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• 1995

A new three-level push-pull type quantum series resonant rectifier for the power factor correction is proposed. The proposed single phase rectifier enables a zero-current switching operation of all the power devices allowing the circuit to operate at high switching frequencies and high power levels. With the proposed control technique, an unity power factor and greatly reduced line current harmonics can be obtained.

• 전력전자학회논문지
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• 제5권5호
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• pp.501-507
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• 2000

형광등용 전자식 안정기의 개발에 있어서, 최근 선전류 고조파 성분의 제한에 관한 여러 가지 규제를 만족시키기 위해 역률 개선 회로를 부가하는 것이 권장되고 있다. 본 논문에서는 자려식 전류원 방식 푸시-풀 공진형 인버터의 전력 트랜스포머의 2차측과 별도의 한 개의 커패시터를 사용함으로써 역률 개선을 수동소자로만 이용하여 전류원 방식의 공진형 인버터를 채택하는 형광등용 전자식 안정기를 저가격화, 고역률화하는 것을 목적으로 한다.