• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.1008-1009
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• 2015

An emergency diesel generator system is an independent source of power that supports important electrical systems on loss of normal power supply. AVR(Automatic Voltage Regulator) is a regulator which regulates the output voltage at a nominal constant voltage level. Specially, a power supply for the AVR must be operated at the very wide input range. In this paper, a flyback power supply with very wide input voltage range is proposed.

• The Journal of the Korea institute of electronic communication sciences
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• v.10 no.6
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• pp.699-706
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• 2015

A previous adapter have a single-ouput, however, a demand of a multi-output adapter increase in the recent industrial site. In order to satisfy the demand, in this research, we implement a programmable high efficiency multi-output adapter. The basic structure of the adapter introduced in this paper is a sort of flyback. The way for producing the reference voltage of the adapter proposed is similar to the way in the general flyback implemented with TL431. In addition to the basic concept of the design, however, we introduce a digital variable resistor, AD5246BKSZ10-RL7 and a microcontroller for changing a programmable multi-output. It makes output be variable that the digital variable resistor change the reference voltage of the adapter by order of the microcontroller. The adapter output voltage is controllable in the range of 20V by the user, and the power efficiency is proven to be 85%.

• Proceedings of the KIPE Conference
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• 2009.11a
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• pp.164-166
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• 2009

본 논문은 소프트스위칭으로 동작하는 두 개의 변압기를 갖는 하프브리지 DC-DC 컨버터에 관한 것으로써, 종래의 중 대용량에 적용된 스위칭모드파워서플라이들의 단점을 개선하고, 특히 제안된 컨버터는 소프트스위칭 방식으로 동작함으로써 주 스위치의 전압/전류로 인한 스트레스를 최소화하여 시스템 전체 효율을 증가시킨다. 제안된 컨버터는 200W(25V/8A)의 프로토 타입으로 제작/설계하였고 실험을 통해 컨버터의 성능을 증명한다.

• The Transactions of the Korean Institute of Electrical Engineers B
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• v.50 no.3
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• pp.122-129
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• 2001

Exact simulation of conducted EMI in switched mode power supplies is proposed. In order to achieve exact simulation, PSPICE active component ABM model and modified transformer model are proposed. Each model parameter is extracted from measurements and data-books. PSPICE simulation results with high frequency PCB pattern model are accordant with EMI measurements for a 50[W] isolated flyback converter. EMI relations of each component and EMI patterns are analyzed.