• Proceedings of the KIPE Conference
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• 2005.07a
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• pp.399-401
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• 2005

A new high performance energy-recovery circuit (ERC) for a plasma display panel (PDP) is proposed. Two different ERCs are employed on both sides of the PDP, and slow falling and fast rising times are applied. It features a zero voltage switching (ZVS), low electromagnetic interference (EMI), low current stress, high efficiency, no severe voltage notch, reduced sustaining voltage, and high energy-recovery capability.

• Journal of Power Electronics
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• v.14 no.3
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• pp.421-431
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• 2014

A DSP-based self-adaptive proportional-integral (PI) controller to control a DC-DC converter is proposed in this paper. The full-bridge topology is adopted here to obtain higher power output capability and higher conversion efficiency. The converter adopts the zero-voltage-switching (ZVS) technique to reduce the conduction losses. A parallel secondary active clamp circuit is added to deal with the voltage overshoot and ringing effect on the transformer's secondary side. A self-adaptive PI controller is proposed to replace the traditional PI controller. Moreover, the designed converter adopts the constant-current and constant-voltage (CC-CV) output control strategy. The secondary active clamp mechanism is discussed in detail. The effectiveness of the proposed converter was experimentally verified by an IGBT-based 10kW prototype.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.14 no.4
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• pp.65-72
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• 2000

This paper proposes a Push type High Frequency DC-DC Converter using Zero Voltage Switching to reduce turn on and off loss at the switching instants. This paper has a advantage which is able to operating safely in load short, because DC reactor is connected with resonance reactor in order to supply a fixed safely in load short, because DC reactor is connected with resonance reactor in order to supply a fixed current with low ripple from DC power supply. The capacitor $(C_1, C_2)$ connected in switch are a common using as resonance capacitor and ZVS capacitor. The analysis of the proposed high frequency resonance DC-DC converter is generally described by using normallized parameter, and we has evaluated characteristic values which is needed to design a circuit. We conform a rightfulness of theoritical analysis by comparing a theoretical values and experimental values obtained from experiment using MOSFET as switching devices.

• The Transactions of the Korean Institute of Power Electronics
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• v.13 no.5
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• pp.396-402
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• 2008

This paper presents the structure and performance of a new Integrated magnetics-based transformer, which can be readily adapted to zero-voltage switching full bridge dc-to-dc converters. The proposed transformer features with two paralleled primary windings and a center-tapped secondary winding. The transformer can be fabricated on standard EE or EI cores where the primary and secondary windings are placed on the outer legs while the output filter inductor is wound on the middle leg. The performance of the proposed transformer is demonstrated with a 100 kHz 720 W experimental dc-to-dc converter which recorded a 92% conversion efficiency at 12 V output voltage.

• The Transactions of the Korean Institute of Power Electronics
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• v.8 no.5
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• pp.407-417
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• 2003

Detachable transformers used in contactless battery chargers have poor power transfer characteristics because they have low coupling coefficients due to their gaps. The ㄷㅓ type core gives a high coupling coefficient in a contactless battery charger compared with standard cores such as EE, EC and UU. In this paper, characteristics of the ㄷㅓ type core is studied. Detailed analyses and comparisons are given based on the sinusoidal operation and square-wave operation. Reductions in output current, voltage and power are stated analytically and numerically. The analyses are verified by experiments conducted on a ZVS converter including a detachable transformer. The analyses and comparison method can be applied to other gaped transformer such as a PCB transformer.

• The Transactions of the Korean Institute of Power Electronics
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• v.10 no.6
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• pp.578-586
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• 2005

Recently, due to the launch of digital broadcasting service, the demand of Flat Panel Display (FPD) is sharply rising. Among them, the PDP is expected to be one of the most promising digital displays of next generation because of its large screen size, high resolution, thinness and board field of view. Meanwhile, the PDP uses ADS (Address Display-period Separation) scheme which divide one subfield into address and sustaining period to express the grey scale of images. Since the output of sustaining power module Is mostly used for sustaining period, the load of the sustaining power module can be considered as a pulsating load. Due to this particular load condition, if the wide ZVS range of the power switches is not guaranteed, the hard switching causes large amount of switching loss and serious thermal problem in power module. In this paper, a high efficiency power conversion circuit for 60' PDP sustaining power module which achieves wide ZVS range with the help of additional ZVS tank is proposed. According to the various gating methods, the different operations of the proposed converter are presented. And, to confirm the properties of the proposed converter, an experimental prototype of 900W power converter is constructed md tested. As a result, more than $92\%$ of high efficiency is obtained at $10\%$ load condition, and the ZVS operation is achieved from full load to $10\%$ load condition.

• Proceedings of the KIPE Conference
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• 2013.11a
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• pp.99-100
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• 2013

기존 용접 컨버터는 풀 브릿지 컨버터는 하드스위칭을 하게 되는데, 이는 스위칭 소자로 사용되는 IGBT의 턴 오프 손실을 증가시키는 단점을 가지고 있다. 본 논문에서는 스위치의 손실을 줄이고자 기존의 풀 브릿지 컨버터에 ZVS(zero voltage switching) 턴 오프 방식를 적용한 회로와 하드 스위칭 방법에 대하여 손실을 PSIM 모의해석을 통하여 비교 분석하였다.

• Proceedings of the KIEE Conference
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• 1992.07b
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• pp.1147-1149
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• 1992

A novel 3$\phi$ ZVS PWM VSI topology employing a simple dc bus subcircuit that provides soft switching commutations is proposed in this paper. The main advantage of the proposed inverter commutation schem is that the dc bus subcircuit is activated only when required, that is, when dictated by the respective PWM. Detailed analysis is provided and simmulation results are presented to verify the principles of operation of the proposed inverter schem.

• Proceedings of the KIPE Conference
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• 2008.06a
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• pp.514-516
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• 2008

A new four level half-bridge converter is proposed in this paper. Compared to a conventional half-bridge converter and an asymmetric half-bridge converter, the proposed converter has less stress on power switching components and have smaller output inductor. Zero-voltage-switching condition is also achieved with the proposed converter. The operational principle, DC conversion ratio and ZVS analysis are presented. Experimental results are demonstrated to verify the feasibility and advantages of the new topologies.

• Proceedings of the KIEE Conference
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• 1999.07f
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• pp.2685-2687
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• 1999

This paper is concerned on developing DC-DC converter. In contrast to resonant converter, this converter requires no external resonant elements and operates with constant switching frequency. In conventional PWM converter, two MOSFET switches of the converter are simultaneously turned on and turned off. In presented converter, to achieve Zero Voltage Switching, the two legs of the bridge are operated DC-DC converter is phase shifted. Phase shifted Full Bridge ZVS PWM Converter have an effect on the power system. Operation principle and features are illustrated by the experiment results from 50W, 250kHz with MOSFET switch.