• Title, Summary, Keyword: Forward converter

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Forward Converter Using 300W Planar Transformer (300W 평면 변압기적용 포워드 컨버터)

  • Choi, S.H;Park J.Y;Kim E.S
    • The Transactions of the Korean Institute of Power Electronics
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    • v.9 no.6
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    • pp.560-567
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    • 2004
  • In this paper, the design and implementation of a high power(300W) forward converter using a planar transformer is presented. The overall size and volume of the converter is decreased by replacing a planar transformer in stead of using a conventional winding transformer. Due to the decreased size and volume, power density of the applied forward converter is increased. Also, in this paper, the 300W ZVS forward converter with active clamp snubber circuit is compared to the 300W hard switching forward converter planar transformer, the decreased size and volume, the 300W ZVS forward converter with active clamp snubber circuit, 30W hard switching forward converter.

A Comparative Study of Operation Characteristics of Active Clamp Forward Converter Based on Loss analysis

  • Oh, Deog-Jin;Kim, Hee-Jun
    • Proceedings of the KIPE Conference
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    • pp.636-641
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    • 1998
  • In this paper, operation characteristics of the Zero-voltage-Switching(ZVS) mode and Non-Zero-Voltage-Switching (NZVS) mode of the active clamp (ACL) forward converter are compared through the loss analysis. The losses of semiconductor devices, transformer and passive elements of the converter are analyzed and compared for each type of operation mode. In order to verify the validity of the analysis, we have built a 50W ACL forward converter and measured the losses of the converter. From the experiment it is known that the ACL forward converter shows nearly same loss distribution for both of operation modes

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Forward DC/DC Converter Using Planar Transformer (평면변압기적용 Forward DC/DC Converter)

  • Choi S. H.;Park J. Y.;Park S. S.;Kim E. S.;Lee H. Y.;Kim H. S.
    • Proceedings of the KIPE Conference
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    • pp.149-153
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    • 2003
  • In this paper, the design and implementation of a high power(300W) forward converter using a planar transformer is presented. The overall size and volume of the converter is decreased by replacing a planar transformer in stead of using a conventional winding transformer. Due to the decreased size and volume, power density of the applied forward converter is increased. Also, in this paper, the 300W ZVS forward converter with active clamp snubber circuit is compared to the 300W hard switching forward converter.

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Alternated Forward ZVS Multi-Resonant Converter (교번으로 동작하는 포워드 영전압 스위칭 다중 공진형 컨버터)

  • 오덕진;황치면;김창선;김희준
    • Proceedings of the KIPE Conference
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    • pp.1-4
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    • 1998
  • In this paper, we proposed the alternated forward zero voltage switching multi-resonant Converter (AT Forward ZVS MRC). The AT forward ZVS MRC has similar characteristics with clamp mode forward ZVS MRC. So it can reduce the voltage stress to tow or three times a input density [W/inch2]. The proposed converter type is verified through the experimental converter with 48V input voltage, 5V/50W output voltage/power. The measured maximum voltage stress is 170V of 2.9 times the input voltage and the maximum efficiency of 81.66% is measured.

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High Frequency Soft Switching Forward DC/DC Converter (고주파 소프트 스위칭 Forward DC/DC 컨버터)

  • 김은수;최해영;조기연;김윤호
    • Proceedings of the KIPE Conference
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    • pp.409-412
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    • 1998
  • In this paper, an improved soft switching forward dc/dc converter is proposed. The proposed converter is constructed by using non-dissipate snubbers in parallel with the main switch and output diode of the conventional forward converter. Due to use of the non-dissipative snubbers, the proposed converter achieves zero-voltage switching for all switching devices and output diodes without switching losses. The complete operating principles and experimental results will be presented.

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A Forward-Integrated Buck DC-DC Converter with Low Voltage Stress for High Step-Down Applications

  • Adivi, Maedeh Ghanbari;Yazdani, Mohammad Rouhollah
    • Journal of Power Electronics
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    • v.18 no.2
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    • pp.356-363
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    • 2018
  • The combination of a buck converter and a forward converter can be considered to accomplish a high step-down non-isolated converter. To decrease the insufficient step-down ratio of a regular buck converter and to distribute switch voltage stress, a forward-integrated buck (FIB) converter is proposed in this paper. The proposed interleaved DC-DC converter provides an additional step-down gain with the help of a forward converter. In addition to its simple structure, the transformer flux reset problem is solved and an additional magnetic core reset winding is not required. The operational principle and an analysis of the proposed FIB converter are presented and verified by experimental results obtained with a 240 W, 150 V/24 V prototype.

An Improved ZVS Active Forward Conveter (개선된 영전압 스위칭 액티브 포워드 컨버터)

  • Choi Sun-Ho;Park Jin-Young;Kim Eun-Soo;Kang Chan-Ho
    • Proceedings of the KIPE Conference
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    • pp.59-63
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    • 2004
  • In this paper, active forward converter with snubber circuit - composed of a tapped inductor, a snubber capacitor, two diodes - is proposed. By adding the snubber circuit, ZVS operation became possible even in a smaller magnetizing current conditions than the conventional converter. The operational principles and the equivalent mode analysis of the proposed converter is described and compared to conventional converter. We constructed the prototype active clamped forward converter with 300W output capacity and verified that efficiency of the proposed converter is higher than the conventional converter.

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A Forward Converter with a Capacitive Output Filter for Isolated LED Lighting Applications (절연형 LED 조명기기를 위한 커패시티브 출력 여과기를 가진 포워드 전력 변환기)

  • Kim, Myungbok
    • Proceedings of the KIPE Conference
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    • pp.394-395
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    • 2011
  • In order to increase the power conversion efficiency and improve the power factor, a modified forward converter is proposed, which adopts a capacitive output filter instead of the inductive output filter of the conventional forward converter. Therefore, the proposed converter has wide input voltage range in opposite to that of the conventional forward converters. Moreover, the proposed converter uses the critical conduction mode for automatic current shaping to improve the power factor. As a result, the proposed converter can achieve quasi-resonant zero-voltage-switching, which can minimize the switching loss of main MOSFET. In addition, the operational principle of the proposed converter is analyzed and the characteristic of the proposed converter is investigated in this paper. To validate the effectiveness of the proposed converter, a prototype of 13W is implemented and the experimental results are discussed in more detail.

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Low Voltage Active-Clamp Forward Converter with MOSFET Synchronous Rectification (MOSFET 동기정류를 이용한 저전압 능동 클램프 Forward 컨버터에 관한 연구)

  • Kim, Hee-Jun;Ji, Ho-Kyun
    • Proceedings of the KIEE Conference
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    • pp.110-113
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    • 1993
  • The MOSFET synchronous rectification in the Active-Clamp Forward converter is presented. The Active-Clamp Forward converter has little dead time during the off time of the main switch and it is suitable for the MOSFET synchronous rectification comparing to the other Forward converter topologics. Using the MOSFET synchronous rectification on the Active-Clamp Forward converter with 3.3[V] output and 500[kHz] switching frequency, the improvement of efficiency is achieved comparing with the conventional Schottky barrier diode rectification.

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High-Efficiency Supercapacitor Charger Using an Improved Two-Switch Forward Converter

  • Choi, Woo-Young;Yang, Min-Kwon;Suh, Yongsug
    • Journal of Power Electronics
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    • v.14 no.1
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    • pp.1-10
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    • 2014
  • This paper proposes a high-efficiency supercapacitor charger. Conventional two-switch forward converter can be used for charging supercapacitors. However, the efficiency of conventional converters is low because of their switching losses. This study presents a high-efficiency two-switch forward converter for supercapacitor chargers. The proposed converter improves power efficiency by 4 %, from 89 % to 93 %. The proposed converter has the advantages of reduced switch voltage stresses and minimized circulating current when compared to other converter topologies. The performance of the proposed converter is evaluated by experimental results using a 300 W prototype circuit for a 54-V, 35-F supercapacitor bank.