• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2009년도 하계학술대회 논문집
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• pp.11-12
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• 2009

In this paper, we propose a high voltage driver IC(HVIC) for LCD and PDP TV power supply. The proposed circuit is included novel a shoot-through protection and a pulse generation circuit for the high voltage driver IC. The proposed circuit has lower variation of dead time and pulse-width about a variation of a process and a supply voltage than a 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 generation circuit prevent from fault operations using a logic gate. Dead time and pulse-width of the proposed circuit are typical 250 ns, and its variation is maximum 170 ns(68 %) about a variation of a process and a supply voltage. The proposed circuit is designed using $1\;{\mu}m$ 650 V BCD process parameter, and a simulation is carried out using Spectre.

• 전기전자학회논문지
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• 제25권1호
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• pp.218-228
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• 2021

본 논문에서는 다중공진회로를 이용한 고효율 DC-DC 컨버터를 제안한다. 제안한 컨버터는 하프브리지 전력구조이며 컨버터의 고효율화를 위해 2개의 인덕터(LL)와 1개의 커패시터(C)로 구성된 다중공진회로를 이용한다. 이 다중공진회로는 동작모드에 따라, 각각의 공진주파수를 가진 직렬회로 형태의 공진회로를 각각 형성한다. 본 논문에서는 먼저, 동작모드와 정상상태 기본파 근사 모델링에 의해 제안한 컨버터의 동작원리를 설명한다. 그다음 이에 근거하여 제안한 컨버터의 설계예시를 보인다. 그리고 설계된 회로 파라미터에 의해 제작된 프로토타입 컨버터의 실험결과를 통하여 제안한 컨버터의 고효율 DC-DC 전력변환 동작특성을 입증한다.

• 한국전자통신학회논문지
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• 제14권3호
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• pp.529-536
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• 2019

스마트 센서 시스템에 압전 에너지 하베스터를 적용하기 위해서는 AC-DC 정류기를 비롯한 에너지 하베스트 인터페이스 회로가 필수적이다. 본 논문에서는 기본적인 회로인 Full Bridge Rectifier(: FBR) 회로와 동기식 압전 에너지 하베스트 인터페이스 회로의 성능을 보드레벨 시뮬레이션으로 비교하였다. 그 결과, 동기식 압전 에너지 하베스트 인터페이스 회로 중 하나인 Synchronous Electric Charge Extraction(: SECE) 회로가 FBR에 비해 출력 전력이 약 4 배 이상 더 컸고, 부하 변동에도 변화가 거의 없었다. 그리고, 출력 전압이 40V 이상인 압전 에너지 하베스터용 SECE 회로에 필수적인 고전압 비교기를 0.35 um BCD 공정으로 설계하였다. 설계한 고전압 비교기를 적용한 SECE 회로는 출력 전력이 FBR 회로 보다 427 % 향상됨을 검증하였다.

• Journal of Power Electronics
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• 제18권2호
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• pp.364-374
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• 2018

A novel passive lossless soft-switching single inductor dual buck full-bridge inverter (PLSSIDBFBI) is presented in this paper. To accomplish this, a passive lossless snubber circuit is added to a dual buck full-bridge inverter. Therefore, the advantages of the dual buck full-bridge inverter are included in the proposed inverter, and the inverter has just one filter inductor, which can decrease the system volume and improve the integration. In addition, the passive lossless snubber circuit achieves soft-switching by its own resonance, and all of the energy stored in the passive lossless snubber circuit can be transferred to load. A comparison between eight topologies is performed in this paper, and the analysis shows that the proposed soft-switching inverter topology has high reliability and efficiency. Finally, experimental results obtained with a 1 kW prototype verify the theoretical analysis and demonstrate the prominent characteristics of a reduced switching loss and improved efficiency.

• 전력전자학회논문지
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• 제20권4호
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• pp.363-368
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• 2015

This paper deals with an improved current source using full-bridge converter type for thyristor valve test of HVDC system. The conventional high-current and low-voltage source of synthetic test circuit requires additional auxiliary power supply to provide the reverse voltage for the auxiliary thyristor valve during turn-off process. The proposed circuit diagram to provide the reverse voltage is extremely simple because no additional component is required. The reverse voltage can be obtained from the input DC voltage of the high-current and low-voltage power supply. The operation principle and design method of the proposed system are described. Simulation and experimental results in scaled down STC of 200 V, 30 A demonstrate the validity of the proposed scheme.

• 한국콘텐츠학회논문지
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• 제10권4호
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• pp.257-264
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• 2010

기존의 경두개 자극장치는 일정한 자극치료 펄스의 정현파 모양으로 다양한 치료 및 진단을 하는데 한계가 있다. 본 연구에서, 치료 및 진단마다 요구되는 세기, 폭, 펄스모양이 다른 코로로프트-월톤회로와 반파브리지 공진 인버터를 도입하여 주파수와 전압이 가변되는 새로운 장치를 제안하고자 한다. 기존장치 보다 많은 장점을 가진다. 첫째로 고압 변압기를 가지지 않는다. 둘째로 스위칭손실이 적고, 출력에너지를 정밀하게 제어할 수가 있다. 세째로 자극의 세기, 폭, 펄스모양이 다양하다. 결과적으로 변압기를 사용하지 않는 반파브리지 인버터와 코크로프트-월톤회로를 적용하여 개선된 특성과 실험을 구하였다.

• Journal of Magnetics
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• 제16권3호
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• pp.246-252
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• 2011

A high-voltage power supply has been built for activation of the brain via stimulation using a Full Wave Cockroft-Walton Circuit (FWCW). A resonant half-bridge inverter was applied (with half plus/half minus DC voltage) through a bidirectional power transistor to a magnetic stimulation device with the capability of producing a variety of pulse forms. The energy obtained from the previous stage runs the transformer and FW-CW, and the current pulse coming from the pulse-forming circuit is transmitted to a stimulation coil device. In addition, the residual energy in each circuit will again generate stimulation pulses through the transformer. In particular, the bidirectional device modifies the control mode of the stimulation coil to which the current that exceeds the rated current is applied, consequently controlling the output voltage as a constant current mode. Since a serial resonant half-bridge has less switching loss and is able to reduce parasitic capacitance, a device, which can simultaneously change the charging voltage of the energy-storage condenser and the pulse repetition rate, could be implemented. Image processing of the brain activity was implemented using a graphical user interface (GUI) through a data mining technique (data mining) after measuring the vital signs separated from the frequencies of EEG and ECG spectra obtained from the pulse stimulation using a 90S8535 chip (AMTEL Corporation).

• Journal of Electrical Engineering and Technology
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• 제10권4호
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• pp.1692-1699
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• 2015

This paper presents an analysis of the mechanism of failure modes in bi-directional phase-shift full-bridge converters, composed of MOSFET, based on the circuit operation and parasitic parameters of MOSFET. In addition, the relation between circuit operation and parameters is suggested through an experimental comparison. From this relation, the suitable ranges of parameters for stable performance are analyzed. The design criteria of the bi-directional phase-shift full-bridge converter are presented and evaluated from the experimental verification.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2008년도 하계학술대회 논문집
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• pp.360-362
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• 2008

In this paper, an improved full bridge inverter is presented to get multiple output for UV lamp and barrier discharge. It has a structure of two equivalent half bridge inverters and one full bridge inverter. The outputs of the proposed circuit can be controlled using frequency and PWM independently. To verify the proposed circuit, theoretical analysis and experimental results has been done using a prototype power supply.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.324-328
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• 2001

This paper presents parallel operation and control loop design of ZVT(Zero Voltage Transition) Full Bridge DC/DC Converter. At parallel operation of ZVT Full Bridge Converter, dynamic current shared inductor devides the same current of unit converter and ZVT circuit and aids to high efficiency in the system. Base on the modeling of ZVT. Full Bridge Converter, the control loop is designed using a simple two-pole, one-zero compensation circuit. To show the validity of the design procedures, the small signal analysis of the closed loop system and open loop system is carried out and the superiority of the dynamic characteristics is verified through the experiment with a 2kW, 50kHz prototype converter.