• The Transactions of The Korean Institute of Electrical Engineers
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• v.66 no.1
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• pp.61-65
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• 2017

In this paper a prototype of high frequency heating power supply system based on the high frequency heating principle is designed to take the place of acupuncture, moxibustion, warm dressing treatment and some other traditional physical therapy methods. Which possess the advantages of low cost, convenient, easy operation and good effect. The high frequency heating power supply can generate a pulse voltage of more than 1KV with 300KHz switching frequency to heat the patient's skin. The skin temperature can reach to $41{\sim}42^{\circ}C$. The peak current control method is used to maintain the skin temperature in the designed range. The design of the main circuit is based on the flyback converter topology. An easier and practical design method is proposed in this paper. The power supply system prototype is verified to be stable and reliable by both the simulation and experimental results.

• Proceedings of the KIPE Conference
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• 2007.07a
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• pp.353-355
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• 2007

A simple technique for PFC circuit is presented using UC3854. This technique is about current peak controlling by a reference current generator. Decreased peak currents of the boost pre-regulator reduce circuit current stress and so rated currents of circuit elements are minimized. Simulation and experimental results will verify the viability of the new scheme.

• Proceedings of the IEEK Conference
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• 2002.06e
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• pp.319-322
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• 2002

In this Paper, we suggested the Half-Bridge inverter for the automotive HID electronic ballast. electronic ballast for automotive HID lamp should be supplied by low-frequency square wave avoiding the acoustic resonance(11kHz ∼ 825kHz). When the HID lamp is hot state, the electronic ballast should supply the sufficient current for a few milli-second to the lamp at the re-strike ignition state. that is called take-over current. We have introduced the new take-over current control method that could have reduced the peak current and supplied the sufficient take-over current.

• Proceedings of the KIEE Conference
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• 2005.07d
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• pp.2643-2645
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• 2005

The power source of inverter welder stable power of low voltage and high current. Because if shouldn't be, it is caused to spark between the parent metal and the peak. So that, we designed to be base on high frequency transformer and reactor of DC part. Then, we optimized control of PWM, current rising slant, voltage, current, pulse current and inverter out-put voltage. Also we designed PCB for EMI and noises.

• Proceedings of the KIEE Conference
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• 2003.07d
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• pp.2772-2774
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• 2003

The power source of inverter welder stable power of low voltage and high current. Because if shouldn't be, it is caused to spark between the parent metal and the peak. So that, we designed to be base on high frequency transformer and reactor of DC part. Then, we optimized control of PWM, current rising slant, voltage, current, pulse current and inverter out-put voltage. Also we designed PCB for EMI and noises.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.1888-1889
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• 2007

The power source of inverter welder stable power of low voltage and high current. Because if shouldn't be, it is caused to spark between the parent metal and the peak. So that, we designed to be base on high frequency transformer and reactor of DC part. Then, we optimized control of PWM, current rising slant, voltage, current, pulse current and 인버터 out-put voltage. Also we designed PCB for EMI and noises.

• Proceedings of the KIPE Conference
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• 2019.07a
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• pp.23-25
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• 2019

PSFB 컨버터(Phase Shift Full Bridge converter)는 다양한 전원장치에 응용되고 있다. 또한 빠른 응답과 1차 측 전류 피크의 불 평형을 방지하기 위해 PCMC(Peak Current Mode Control)를 적용해야 한다. 하지만 PCMC는 유효 시비율이 0.5 이상 일 때 저주파 발진이 일어나기 때문에 경사 보상 기법을 이용해 발진을 막아야 한다. 일반적으로 경사보상 기울기는 최댓값을 사용하기 때문에 전류 명령이 과 보상되며, 무효시비율 구간을 고려하지 않기 때문에 응답속도가 지연 되는 문제가 있다. 따라서 본 논문에서는 무효 시비율 구간을 고려한 하이브리드 피크-밸리 전류 밴드 제어를 통해 BUCK 컨버터와 동일한 응답 특성을 가지는 PSFB 컨버터 제어 기법을 제안한다. 제안하는 기법은 PSIM 시뮬레이션을 통해 검증되었다.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.57 no.10
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• pp.1796-1801
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• 2008

In this paper, a new current based maximum power point tracking (CMPPT) method is proposed for a single phase photovoltaic power conditioning system and the current based MPPT modifies incremental conductance method. The current based MPPT method makes the entire control structure of the power conditioning system simple and uses an inherent current source characteristic of solar cell array. In addition, digital phase locked loop using an all pass filter is introduced to detect phase of grid voltage as well as peak voltage. Controllers about dc/dc boost converter, dc-link voltage, dc/ac inverter is designed for a coordinated operation. Furthermore, PI current control using a pseudo synchronous d-q transformation is employed for grid current control with unity power factor. 3kW prototype photovoltaic power conditioning system is built and its experimental results are given to verify the effectiveness of the proposed control schemes.

• Proceedings of the KIEE Conference
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• 1996.07c
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• pp.1719-1721
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• 1996

This paper describes the thermally stimulated current(TSC) of PAAS spin coated film and the electrical properties of pre TSC measurement and after TSC test specimens. The TSC measurement were performed from room temperature to about $280^{\circ}C$ and the temperature was increased by $5^{\circ}C/min$ automatically. It shows that two peaks of TSC are observed at about $50^{\circ}C$ and about $160^{\circ}C$. Result of this measurement indicate that one peak; $50^{\circ}C$ is from alkyl group; other peak at $160^{\circ}C$ is due to alkyl and C-O group of PAAS. Addition to larger peak at about $160^{\circ}C$ is due to dipolemoment of PAAS film. This result is proved by DSC measurement of PAAS film. The electrical properties of pre and after TSC were measured by currant-voltage(l-V) characteristics. The current-voltage characteristics after TSC specimens are increased the conductivity. The electrical properties of pre-after TSC measurement specimen is in the middle of imidization of PAAS. Because of this result a thermal imidization was performed at $300^{\circ}C$ for 1 hour.

• Proceedings of the KIEE Conference
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• 2003.07e
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• pp.162-165
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• 2003

A resonant type voltage source and power device and a control method using Pulse Density Modulation(PDM) power control and Pulse Width Modulation(PWM)voltage control for plasma sterilization are described. For the stability of discharge in the generating tube, it is desirable that the peak apply voltage is constant. The PDM power control is employed for sustaining the voltage constant at any generating tube input power. Moreover, to avoid the influence of input AC voltage fluctuation etc., PWM voltage control with generating tube peak voltage feedback is used. Both functions were confirmed by the experiment with inverter and generating tube. The effect of input synchronous PDM method for input current stabilizing is confirmed also.