• JSTS:Journal of Semiconductor Technology and Science
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• v.3 no.2
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• pp.102-106
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• 2003

This paper describes novel low-power high-speed flip-flop called dual edge-triggered NAND keeper flip-flop (DETNKFF). The flip-flop achieves substantial power reduction by incorporating dual edge-triggered operation and by eliminating redundant transitions. It also minimizes the data-to-output latency by reducing the height of transistor stack on the critical path. Moreover, DETNKFF allows negative setup time to provide useful attribute of soft clock edge by incorporating the pulse-triggered operation. The proposed flip-flop was designed using a $0.35{\;}\mutextrm{m}$ CMOS technology. The simulation results indicate that, for the typical input switching activity of 0.3, DETNKFF reduces power consumption by as much as 21 %. Latency is also improved by about 6 % as compared to the conventional flip-flop. The improvement of power-delay product is also as much as 25 %.

• Proceedings of the KIEE Conference
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• 1997.11a
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• pp.438-440
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• 1997

This paper proposed a partial resonant switching three-phase high power factor converter using a $PRS^2$(Partial Resonant Soft Switch). The proposed converter has a merit of simple controlled circuit because the input current control DCM(Discontinuous Conduction Mode). And it is improve to input power factor that the snubber capacitor's energy regenerate to the AC source side. This topology is reduced a current/voltage stresses of resonant devices in addition to a partial resonant strategy. The result of simulations with the proposed topology included in this paper.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.988-989
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• 2015

본 논문은 저압 직류배전의 시스템에 적용하기 위한 ZVS 방식의 100kW 고강압 DC-DC 컨버터를 제안하고 실험을 통하여 타당성을 검증하였다. 제안된 시스템은 저압 직류배전 설비에 구성되는 시스템으로 1500Vdc가 송전될 때 가정이나 공업용으로 사용 가능한 380Vdc로 강압시켜주는 장치이다. 고압 특성상 하드 스위칭시 손실이 커 ZVS 동작이 가능하도록 구성하였고, 구성된 시스템에 대해 정격 실험 결과 100kW 부하에서 95.8%의 효율을 보였다.

• Proceedings of the KIPE Conference
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• 2006.06a
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• pp.372-374
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• 2006

This paper reported the experimental results of the 2 stage converter using a Buck converter and a soft switching dc-to-dc converter that employs two separate transformers. A 2 stage converter module is designed with the specifications of an 3.3V output voltage, 20A output current, 66W output power and 36-75V input voltage. A prototype converter module is successfully implemented within 85.2% efficiency and 3% voltage regulation for the entire input voltage range, thereby demonstrating its application potentials to future telecommunication electronics.

• The Transactions of the Korean Institute of Power Electronics
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• v.3 no.4
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• pp.375-381
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• 1998

Zero Voltage Switched (ZVS) Pulse Width Modulation (P~마1) converter which operates a fixed frequency is proposed in this paper. The main switches of the converter are always switched at zero voltage, and the auxiliaη switches are s softly switched, The voltage and current stresses of the switches are minimized as low as in conventional PWM converters, The suggested buck typed converter is analyzed. designed for a battery charger. The designed characteristics are experimentally verified by the results of the buck type converter.

• Journal of Power Electronics
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• v.2 no.3
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• pp.206-211
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• 2002

Silent gas discharge method has been widely applied fur ozone production, ultraviolet light and UV laser generation. Since ozone and ultraviolet applications have tendency to spread widely in industry, the development of efficient and low - cost power supply for such systems is an important task at present. This paper introduces high-frequency inverter type mode power supply designed fur ozone generation tube and ultraviolet generation excimer lamp and considerations on the design of the inverter and pulse density modulation control strategy applied in it.

• Proceedings of the KIPE Conference
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• 2002.07a
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• pp.480-484
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• 2002

A new active lossless snubber for half-bridge dual converter(that is called 'dual converter') is proposed in this paper. It features soft switching(ZVS) as well as turn-off snubbing in both main and auxiliary switches. As it uses parasitic components, such as leakage inductances and switch output capacitances etc, it helps the dual converter to operate at the higher frequency with a higher efficiency and smaller size reactive components. The operational principle, theoretical analysis, and design consideration are presented. To confirm the operation, features and validity of the proposed circuit, simulated results from an 1kW, 24V/DC-250V/DC are presented.

• Proceedings of the KIPE Conference
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• 2003.07b
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• pp.511-515
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• 2003

This paper presents a novel prototype of the utility-interfaced sinusoidal pulse width modulated (SPWM) inverter using the high-frequency flyback transformer fur the small-scale solar photo-voltaic power conditioner (1kW - 4kW). The proposed SPWM power conditioner circuit with a high-frequency link has a function of electrical isolation, which is vital fur solar photovoltaic power conditioner systems with the viewpoint of safety and convenience. The discontinuous conduction mode (DCM) operation of the flyback transformer is also maintained to simplify the topology of the inverter circuit and control scheme. First, the operating principle of the proposed circuit is described far the understanding of the circuit parameters establishment. Then, the digitally constructed SPWM control scheme is presented. The proposed circuit is verified by the computer simulation and the prototype experiment.

• Proceedings of the KIPE Conference
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• 2003.07b
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• pp.777-780
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• 2003

In this paper, an improved full wave mode ZVT-PWM DC-DC Converter is presented to maximize the regeneration ratio of resonant energy by only putting an additional diode in series with auxiliary switch. The operation of auxiliary switch in a half wave mode makes possible the soft switching condition of all switches. Furthermore, the increase of the regeneration ratio to resonant energy results in low conduction losses and minimum voltage and current stresses. The operation principles of the proposed converters are analyzed using the PWM boost converter topology as an example. Theoretically analysis and experimental results verify the validity of the boost converter topology with the proposed full wave mode ZVT-PWM converters

• Proceedings of the KIPE Conference
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• 2010.07a
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• pp.3-5
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• 2010

본 논문은 연료전지를 이용한 가정용 발전시스템의 계통 연계를 위한 3kW급 전력변환 시스템의 개발에 관한 것이다. 저전압 대전류 출력특성을 갖는 연료전지의 전류리플 최소화를 위해 멀티페이즈 컨버터를 적용한 DC/DC 승압 컨버터를 제안하고자 한다. 특히 고밀도 전력변환 시스템의 스위칭 손실 극소화를 위해 고효율 ZVS Soft-Switching 동작을 구현하였다. 또한 본 연구에서는 높은 승압비로 변환된 전압을 통해 계통운전 동작을 수행하기 위한 DC/AC 단상 인버터와 고효율 무결점 기능을 갖는 디지털 방식의 DSP를 적용한 제어기 개발도 병행하여 수행되었다. 제안하는 3kW급 멀티페이즈 컨버터 및 계통연계형 인버터의 Proto-Type을 제작하고 실험을 통해 본 방식의 타당성을 검증하였다.