• Proceedings of the KIPE Conference
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• 1999.07a
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• pp.646-649
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• 1999

A new isolated boost dc to dc convertor suitable for a low input voltage application is proposed. The proposed convertor features the low switch current stresses, the wide input voltage range operation, and the inherent inrush current protection characteristics, essential to design a low to high voltage conversion circuit. A comparative analysis and experimental results are presented to show the validity of the proposed convertor.

• Proceedings of the KIEE Conference
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• 1992.07b
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• pp.1025-1028
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• 1992

In this paper the flyback converter analysis is presented using the model of the PWM switch, which is easier to use than the general method of state-space averaged model. A procedure to design the flyback convertor and the feedback circuit is illustrated. From these results, a stable flyback convertor regulation system is possible by using the PWM switch model.

• Proceedings of the KIEE Conference
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• 1991.11a
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• pp.227-230
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• 1991

This paper discussed with a voltage-fed Type high frequency inverter with simple main circuit and high efficiency. The proposed inverter is proper as a high frequency inverter of home applications applied with induction heating principle of high frequency. and also, this paper proposed an computer analysis for resonant L and C.

• Journal of Power Electronics
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• v.19 no.3
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• pp.645-654
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• 2019

In this paper, a new high step up DC/DC converter with a modified super-lift technique is presented. The coupled inductor technique is combined with the super-lift technique to provide a tenfold or more voltage gain with a proper duty cycle and a low turn ratio. Due to a high conversion ratio, the voltage stress on the semiconductor devices is reduced. As a result, low voltage ultra-fast recovery diodes and low on resistance MOSFET can be used, which improves the reverse recovery problems and conduction losses. This converter employs a passive clamp circuit to recycle the energy stored in the leakage inductance. The proposed convertor features a high conversion ratio with a low turn ratio, low voltage stress, low reverse recovery losses, omission of the inrush currents of the switch capacitor loops, high efficiency, small volume and reduced cost. This converter is suitable for renewable energy applications. The operational principle and a steady-state analysis of the proposed converter are presented in details. A 200W, 30V input, 380V output laboratory prototype circuit is implemented to confirm the theoretical analysis.

• 전자공학회논문지 IE
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• v.47 no.3
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• pp.14-18
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• 2010

In this paper, we describe a CMOS DC-DC converter with a variable output voltage(5-7V @100mA) for a portable battery-operated system applications. The proposed DC-DC converter is used along with a Pulse-Frequency Modulation (PFM) method and consists of reference circuit, a feedback resistor, a controller, and an internal oscillator. The integrated DC-DC converter with two external passive components(L,C) has been designed and fabricated on a 0.5um 2-poly 3-metal CMOS process and could be applied to the Personal Digital Assistants(PDA), cellular Phone, Laptop Computer, etc.

• Proceedings of the KIEE Conference
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• 2003.10b
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• pp.177-180
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• 2003

본 논문에서는 dc-dc convertor의 진단을 위해 buck 컨버터의 등가 모델을 가정하고 주요 파라메터를 시스템 식별 기법을 통해 추정하였으며 추정된 결과가 실제 시스템의 특성을 충실히 반영하는지를 계측기를 통한 주파수 응답 측정 결과와 비교하여 검증하였다. dc-dc 컨버터의 모델 파라메터 추정을 통해 주요 진단지수를 계산할 수 있으며 진단 지수를 이용하여 시스템의 열화 여부를 판단할 수 있음을 확인 하였다.

• Proceedings of the KIEE Conference
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• 1992.07b
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• pp.1176-1178
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• 1992

This paper shows enhanced working performance of the battery fork-lift truck by developing the IGBT full bridge dc-dc convertor using one-chip micro-processor. The PWM pulse is generated from a 16 bit one-chip micro-processor for the speed control of DC motor. In order to ensure the operation of IGBT and motor pecewisely, IGBT gate drive circuit was designed by using current limiting IC and hige voltage limit IC. And also It is able to regenerative braking.

• Proceedings of the KIEE Conference
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• 2005.10c
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• pp.172-174
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• 2005

A ZVZCS(Zero-Voltage and Zero-Current-Switching) Three-Level DC/DC Convertor reducing voltage stress of auxiliary circuit is proposed. The principle of operation, feature and design considerations are illustrated and verified through the experiment with a 2kW 40kHz IGBT based experimental circuit.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.952-953
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• 2015

In this paper, various MPPT control in the most simple and widely used method of IC using the method According to the type of DC-DC converter to analyze the efficiency buck-boost convertor, Cuk convertor using each efficiency was analyzed.

• Journal of Advanced Navigation Technology
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• v.21 no.3
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• pp.220-229
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• 2017

In this paper, To take advantage a variety of DC power as the boost DC-DC converter design specifications through the inductor L and capacitor C through PSPICE to calculate the best estimate of the value. Boost DC-DC converter with a switch device using IRF840 and reverse recovery time Schottky diodes with excellent with constant current controller using D10SC6M and resistance can be configured to considering the Power LED Module was driven by the production. Converter's switching frequency is 50 kHz, the first Duty Rate was made to increase gradually depending on the value of the detection were, 10 % in the output voltage. As a result, the simulated Boost Power LED driver characteristics is in comparison with the design specifications, 5% or less as the error was approximated. Finally, when input 15 V were offered, a stable output 24 V were obtained. and Dimming Control through the adjustment of brightness and current consumption were possible.