• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2004.11a
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• pp.385-390
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• 2004

In this paper, electronics ballast using double resonant inverter for 250[W] MHD lamp is designed and implemented. Electronics ballast reduce a turn -on/offf loss by using ZVS(Zero Voltage Switching) technic in the double resonant inverter, and when circuit have a analysis, the characteristic evaluations is described generally by using the normalized parameters used numerical analysis. We conform a rightfulness of theoretical analysis by comparing theoretical waveforms and Pspice waveforms and experimental waveforms, double resonant inverter for 250[W] MHD lamp is operated safely.

• Proceedings of the KIPE Conference
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• 2000.07a
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• pp.309-312
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• 2000

Single-phase multi-level AC-DC converter is proposed that is composed of diode bridge and switch. The number of the supply current level is depending on the individual current level of the converter. A converter circuit the number of the level is equal to $\textrm{2}^{M+1}$-1 The proposed circuit has converter with 31 current levels. When the number of current level is increased smoother sinusoidal waveform can be obtained directly and it is possible to control the supply current almost continuously from zero to maximum without step changes of generating high voltage as pulse width modulation switching loss is decreased it has an advantage in large capacity. it is illustrated technique are confirmed the validity and effectiveness through the simulation & experiments

• Proceedings of the KIPE Conference
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• 2007.11a
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• pp.79-81
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• 2007

본 논문에서는 소나용 고출력 전력증폭기의 효율을 향상시키기 위하여 Class E 설계 기법을 분석하고 소나 시스템의 송신기에 적용하였다. Class E 기법에 기반하여 전력소자를 스위칭 모드로 동작시켜서 Zero Voltage Switching(ZVS)이 발생하도록 회로를 설계함으로써 전력 소자의 전력 손실을 최소화하고 전력 증폭기의 효율을 최대화하여 주었다. 설계된 Class E 기법의 전력 증폭기의 동작 및 타당성을 시뮬레이션을 통하여 검증하였다.

• Proceedings of the KIPE Conference
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• 2017.11a
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• pp.181-182
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• 2017

In the battery system, an isolated converter is used for the stability of the system when controlling the charge and discharge of the battery. A fixed frequency LLC converter which is a type of isolated converter, has the advantage of high efficiency and power density with zero voltage switching at high frequency. Therefore, in this paper, the operation analysis, design and experimental verification of the LLC resonant converter with high efficiency and high power density for the ESS system were conducted.

• Proceedings of the KIEE Conference
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• 1992.07b
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• pp.988-991
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• 1992

A new zero voltage switching PWN converter family is presented by using a new ZVS PWN module (ZPM) with a saturable inductor which prevents diode junction capacitors and a commutation inductor from resonating. The new converters show almost all characteristics of the conventional PWN converters. A boost ZVS PWN converter is applied to a power factor correction circuit. It operates on an continuous conduction mode. Experimental results for output power of 1kW are presented.

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.940_941
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• 2009

Dual Buck Inverter구조를 가지는 70W CDM 램프용 전자식 안정기의 제어기를 설계하였다. 전자식 안정기는 EMI filter, Active PFC, Dual Buck Inverter, Igniter, SMPS로 구성 된다. 제어기는 크게 2개로 구분 할 수 있다. MC33262를 이용하여 Inverter의 전압, 전류를 센싱 받아 70kHz의 Zero Voltage Switching을 위한 제어기와 시간의 경과에 따라 PFC의 출력 전압 제어, Ignition Pulse 제어 및 무부하 보호를 위한 제어기로 구성되어 있다. 본 논문은 ATmega8을 이용하여 제어기를 설계하였고 실험으로 시간의 경광 따른 안정기의 제어가 안정적인 동작을 하고 있음을 증명하였다.

• Proceedings of the KIPE Conference
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• 2004.07b
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• pp.615-619
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• 2004

A new asymmetrical zero voltage switching (ZVS) active clamp forward converter is proposed. Since the ripple current of secondary inductor plays a key role in the ZVS operation of main power switch, the proposed converter shows an excellent ZVS performance. The synchronous rectification is employed to reduce the rectification loss. The operational principle and ZVS analysis are presented. Experimental results demonstrate that the proposed converter can achieve an excellent ZVS performance throughout all load conditions and the significant improvement in the efficiency for the 100W(5V,20A) prototype converter.

• Proceedings of the KIPE Conference
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• 2004.07b
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• pp.519-523
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• 2004

In this paper, a simple power control scheme of Class-D inverter, which is varied duty cycle of fixed frequency to desired output power. It is more suitable and acceptable for high-frequency induction heating (IH) jar applications. The proposed control scheme has the advantages of not only wide power regulation range but also ease to control output power. Also it can achieve the stable and efficient Zero-Voltage-Switching (ZVS) in whole load range. The control principles of proposed method are described in detail and its validity is verified trough simulations results on 38.5kHz IGBT for induction heating rated on 1.6kW with constant frequency variable power.

• Proceedings of the KIPE Conference
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• 2008.06a
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• pp.40-42
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• 2008

This integrated magnetic (IM) transformer is proposed for a phase shifted full bridge (PSFB) converter with zero voltage switching (ZVS). In a new IM transformer, the transformer is located on the center leg of E-core and the output inductor is wound on two outer legs. The proposed circuit is analyzed electrically and magnetically. An E-core is redesigned and implemented. The proposed IM transformer is experimentally compared with the conventional one through a 1.2kW prototype converter.

• The Transactions of the Korean Institute of Electrical Engineers B
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• v.49 no.6
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• pp.441-449
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• 2000

Analysis, design and practical implementation of a single-stage electronic ballast for compact fluorecent lamps are presented in this paper. The proposed topology is based on a single-stage ballast which combines a boost converter and a half-bridge series resonant inverter. High power factor is achieved by using the boost semi-stage operating in discontinuous conduction mode, and inverter semi-stage operated above resonant frequency to provide zero voltage switching is employed to ballast the fluorescent lamp. Analytical and experimental results from the ballast system with 36W fluorescent lamps have demonstrated the feasibility of the proposed single-stage electronic ballast.