• 전력전자학회:학술대회논문집
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• 전력전자학회 2018년도 추계학술대회
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• pp.98-100
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• 2018

This paper describes design of the 40-kV, 300-A solid-state pulsed power modulator for environmental applications. The modulator has been modified based on a solid-state pulsed power modulator with 150-A current capacity. To improve the pulsed power modulator, the discharge IGBT was changed. In addition, the gate driver was tuned according to the characteristics of the switch. Finally, experimental results proved the reliability of the modified solid-state pulsed power modulator.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2015년도 전력전자학술대회 논문집
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• pp.193-194
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• 2015

In this paper, the solid state pulsed power modulator developed in KERI, which is based on IGBT technologies are overviewed. During last ten years, several kinds of solid state modulators were developed in KERI such as IGBT stacks with step up transformer, full IGBT stack based marx generator, modified IGBT marx generator and high repetitive solid state modulator. Basic principle of the design is described and each pros and cons are compared. KERI's solid state pulsed power modulators has lot of advantages for industrial pulsed power application focused on everlasting life cycle and high repetitive, and shows superior arching protection ability.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2019년도 전력전자학술대회
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• pp.307-308
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• 2019

The Pohang Light Source (PLS) - II is a 3 GeV third-generation synchrotron radiation facility. To inject electron beam from LINAC, a kicker modulator system and kicker magnets are installed in the PLS-II storage ring tunnel. The injected beam then falls into the storage ring beam dynamic aperture. This paper describes the design and implementation of the solid-state kicker modulator for PLS-II. The solid-state kicker modulator is consisted of high voltage solid state switch stacks. the technical considerations of the solid-state switch stacking for kicker modulator is discussed. The achieved capability of the solid-state kicker modulator demonstrates that is fulfills the design requirement of providing half-sine pulsed current of 10kA (peak), 6us (Base-width), with jitter < 2ns (Standard deviation). simulation and experimental results are presented to demonstrate the performance of the solid-state kicker modulator.

• Journal of Power Electronics
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• 제11권4호
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• pp.612-619
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• 2011

This paper presents a water treatment system for leachate from sewage-filled ground that uses a pulsed-power modulator developed based on semiconductor switches in order to realize a long life, a high repetition rate, and a fast rising time. The specifications of the developed pulsed-power modulator are the pulsed output voltage, the output current, the pulse repetition rate (PRR), the pulse width, and an average output power of $60\;kV_{max}$, $300\;A_{max}$, 3000, $50\;{\mu}s$, and 15 kW, respectively. The pulsed-power water treatment system was introduced and analyzed using an equivalent electrical circuit model to optimize the output voltage waveform. The experimental results verify that the proposed water treatment system can be effectively used for industrial applications.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2019년도 전력전자학술대회
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• pp.171-173
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• 2019

In this paper, 10kV solid-state pulsed power modulator with high repetition rate is described. The modulator is based on a Marx generator that charges capacitors in parallel and discharges them in series. Twelve IGBTs and capacitors are connected in series to generate output voltages up to 10kV at a repetition rate of 100kHz. The volume of the modulator is 26.1 liters, and its maximum average output power is 10kW. Therefore, the compact design is achieved with a high power density of 380 W/L. Finally, it is confirmed that the pulsed power modulator can operate stably through the experiment results at 10kV 100kHz condition.

• 한국전자파학회논문지
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• 제22권4호
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• pp.440-446
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• 2011

본 논문에서는 레이더 시스템에 적용이 가능한 50 W 출력을 가지는 X-대역 pulsed SSPA(Solid State Power Amplifier)를 설계 및 제작하였다. SSPA를 펄스 모드로 동작시키는 방법으로 펄스 변조 방법과 전원 스위칭 방법을 혼용한 방법을 제안하였다. SSPA는 구동 증폭기, 고출력 증폭기, 펄스 변조기로 구성되며, 충분한 이득과 출력 크기를 얻기 위해 25 W GaAs FET 4개를 병렬 구조로 구성하였다. 측정 결과 1.12 GHz 대역폭에서 출력 50 W, 이득 44.2 dB의 성능을 가졌다. 또한, pulse droop은 1 dB 이하로 설계 목표를 만족하였으며, 12.45 ns 이하의 상승/하강 시간을 가졌다. 제작된 X-대역 pulsed SSPA 크기는 $150{\times}105{\times}30\;mm^3$로 매우 작은 크기를 가졌다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2012년도 전력전자학술대회 논문집
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• pp.230-231
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• 2012

This paper describes a gate driver that operates numerous semiconductor switch in the solide-state pulsed power modulator. the proposed gate driver is designed to receive both the isolated drive-power and the on/off pulse signals through the transformer. Moreover, the IGBT-switch can be quickly turned off by adding protection circuit. Therefore it protects the IGBT-switch from the arc condition that frequently occurs in high-voltage pulse application. To comprehend operating characteristic of each IGBT-switch in pulse output condition, the device consisting of a high efficiency soft-switching capacitor charger and two series stacking IGBT-switch is developed. Finally, the relability of the proposed gate driver and the device for its test are proved through PSpice simulation and experiments.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2018년도 추계학술대회
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• pp.101-103
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• 2018

This paper describes -40kV high voltage solid state pulse power modulator (SSPPM) for driving a magnetron, which is used as a RF power source of LINAC for cancer treatment systems. In case of the medical LINAC, small size and light weight are required. The SSPPM is 92 liters in size and weighs 50 kg. In this paper, S-band 2.6 MW magnetron load experiment is conducted and impedance matching was applied to obtain a smooth output current. Finally, the experimental results is discussed and the reliability of SSPPM is verified.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 E
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• pp.2035-2037
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• 1999

This paper describes an ASM(All Solid-state Modulator) pulsed power generator for non-thermal plasma applications. The proposed generator can produce 20kV, 500A, 100ns pulses at repetition rates up to 10kHz, and it is composed of 30 series connections of power circuit card assembly which contains paralleled MOSFETs, MOSFET drivers, energy storage capacitors and specially designed 1:1 pulse transformer. Higher pulse voltages and currents can easily be obtained by increasing the numbers of series and parallel connections of power circuit card and MOSFETs, respectively. Component layouts are optimized to minimize the leakage inductance and the voltage spikes across switching devices. Especially it put emphasis on the over-current protection (including short circuit) for the reliable operation in real situations. Experimental results show that the proposed pulser is very efficient in air pollution control application and could be useful for other applications such as synthesis of nanosize powders and non-thermal food processing.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2015년도 전력전자학술대회 논문집
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• pp.387-388
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• 2015

본 논문은 장펄스 폭을 가지는 펄스 전원 장치에 대해서 기술한다. 펄스 전원 장치는 크게 충전부와 펄스부로 나누어 진다. 충전부의 경우 고효율, 고신뢰성을 위한 공진형 컨버터와 높은 전압이득을 위한 배전압 정류 회로로 구성 되어 있으며, 펄스부의 경우 펄스의 제어가 용이하고 고밀도 구현이 가능한 수정형 막스 방식의 제네레이터를 채택하고 있다. 또한 개발된 펄스 전원 장치는 직렬 스태킹 되어 있는 반도체 스위치의 효과적인 동기화 및 안정적인 구동과 장펄스를 만들어 내기 적합한 게이트 구동회로를 사용하고 있다. 다양한 실험 결과를 통하여 장펄스 전원장치 설계의 타당성과 우수성을 검증한다.