• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.22 no.10
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• pp.801-807
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• 2009

In this paper, we propose a novel shoot-through protection circuit and pulse generator for half-bridge driver IC. We designed a robust half-bridge driver IC over a variation of processes and power supplies. The proposed circuit is composed a delay circuit using a beta-multiplier reference. The proposed circuit has a lower variation rate of dead time and pulse-width over variation of processes and supply voltages than the conventional circuit. Especially, the proposed circuit has more excellent pulse-width matching of set and reset signals than the conventional circuit. Also, the proposed pulse generator is prevented from fault operations using a logic gate. Dead time and pulse-width of the proposed circuit are typical 250 ns, respectively. The variation ratio is 68%(170 ns) of maximum over variation of processes and supply voltages. The proposed circuit is designed using $1\;{\mu}m$ 650 V BCD (Bipolar, CMOS, DMOS) process parameter, and the simulations are carried out using Spectre simulator of Cadence corporation.

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.991_992
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• 2009

최근 산업기기의 발달과 신재생에너지원 사용 증가로 인하여 대전력용 직류전원 변환장치의 관심이 고조되고 있다. 이에 본 논문에서는 입출력 절연을 통하여 안전성 향상 및 고승압이 가능하며, 효율이 우수한 Half-Bridge 절연형 DC/DC 컨버터를 제안한다. 제안된 컨버터는 출력단에 콘덴서를 이용한 배압 회로를 사용하여 고승압을 실현 하였으며, Soft Switching 방식을 적용하여 고효율화가 가능함을 검증 하였다.

• Proceedings of the KIPE Conference
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• 2005.07a
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• pp.289-291
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• 2005

In this paper results of the experiment which used LLC resonant half bridge DC-DC converter to a portable electrical equipment. LLC resonance Half Bridge DC-DC converter which was used in this experiment improved an efficiency because it reduced switching, conduction losses and with synchronous rectifier. As a result of the experiment, this proposed converter could verified an increase of 2% to the efficiency more than diode rectifier.

• Proceedings of the KIEE Conference
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• 2000.07b
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• pp.1074-1076
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• 2000

This Paper reports on an experimental and theoretical work about self exited Half-Bridge inverter for contact less battery chargers. The steady state characteristics of inverter are analysis and the experimental result for 500kHz, universal AC source input have been obtained. These inverter is suitable for the portable appliances with battery chargers such as cellular phone.

• Proceedings of the KIPE Conference
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• 2007.07a
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• pp.147-149
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• 2007

A new half bridge converter without DC offset of magnetizing current is proposed. The proposed half bridge converter can realize no DC offset of magnetizing current as well as no circulating current, and guarantee ZVS operation. Therefore it has high efficiency and high power density, especially in wide input range. The operational principle, DC conversion ratio and ZVS analysis are presented. Experimental results demonstrate that the proposed converter can achieve a significant improvement in the efficiency.

• Proceedings of the KIEE Conference
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• 2005.07b
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• pp.1392-1394
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• 2005

In this paper results of the experiment which used LLC resonant Half Bridge DC-DC converter to a portable electrical equipment. LLC resonant Half Bridge DC-DC converter which was used in this experiment improved an efficiency because it reduced switching, conduction losses and with synchronous rectifier. As a result of the experiment, this proposed converter could verified an increase of 2% to the efficiency more than diode rectifier.

• Proceedings of the KIEE Conference
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• 1998.11a
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• pp.150-152
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• 1998

ZVS Half-Bridge converter is proposed. This converter is operating in fixed switching frequency to regulate output voltage. The ZVS is maintained by Partial resonance during the OFF interval of both switches. Using self-driven synchronous rectifier, this circuit minimizes the Power loss in the rectification circuit. 50[W] ZVS Half-Bridge converter is simulated and built. Two results has been compared.

• Proceedings of the KIEE Conference
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• 2002.07b
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• pp.1117-1119
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• 2002

In this paper, we have developed a ZVS half-bridge converter with a clamping circuit for the DC power source of PDP circuit. The clamping circuit in the developed converter reduces the oscillating current of the switch by resonant inductor and parasitic parameters in output rectifier diodes. Finally, comparing the experimental results of the developed converter to the conventional ZVS half-bridge converter, it is clarified that the developed converter is more efficient and lower noise than the conventional one.

• Proceedings of the KIEE Conference
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• 2004.07c
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• pp.1951-1953
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• 2004

In this study, we propose a small high voltage power supply which use a half-bridge ZCS resonant and Cockroft-Walton on circuit, for ESP (Electrostatic Precipitator). This power supply transfers energy from ZCS resonant inverter to step-up transformer and the transformer secondary is applied to the Cockroft-Walton circuit for generating high voltage as discharging source of electrodes. It is highly efficient because its amount of switching losses are reduced by virtue of the current resonant half-bridge inverter, and also due to the small size, low parasitic capacitance in the transformer stage owing to the low number of winding turns of the step up transformer secondary combined with the Cockroft-Walton circuit. From these results, the best operational condition is obtained at the switching frequency of 9 kHz and the duty ratio of 50 % in this ESP.

• Proceedings of the KIEE Conference
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• 1994.07a
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• pp.516-518
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• 1994

A new class of zero-voltage switching (ZVS) pulse width modulated (PWM) half-bridge converter is investigated. The new converter is capable of switching zero voltage and keeping advantages of quasi-resonant half-bridge converter while maintaining constant frequency operation. The theoretical analysis of a ZVS PWM half bridge converter is presented and is verified by PSPICE simulation results.