• Proceedings of the KIPE Conference
• /
• 2013.07a
• /
• pp.433-434
• /
• 2013

본 논문에서는 절연타입의 Half-bridge 구조를 이용하여 입력단을 구성하고 출력단에 5레벨의 출력전압을 생성할 수 있는 새로운 구조의 멀티레벨 PWM 인버터를 제안한다. 기존의 Cascaded H-bridge 멀티레벨 인버터는 두 대의 H-Bridge 인버터 모듈을 직렬 결합하여 5레벨의 출력전압을 생성하는 방식이며, 제안하는 방식은 기존 멀티레벨 인버터의 기본 모듈인 H-bridge의 전원을 절연타입의 Half-bridge 구조를 이용하여 구성하고 스위칭 소자 1개와 다이오드 1개를 추가한 구조이다. 동일한 5레벨의 출력전압 생성 시 기존 방식은 2차 측에 8개의 스위칭 소자가 사용되는 반면 제안된 방식은 5개의 스위칭 소자와 1개의 다이오드가 사용되기 때문에 스위칭 손실 및 부피를 줄일 수 있으며 입력단과 출력단 사이의 절연으로 인한 시스템의 안정성을 확보할 수 있다. PSIM 기반의 컴퓨터 시뮬레이션을 통해 제안된 멀티레벨 인버터의 타당성을 검증한다.

• Journal of Power Electronics
• /
• v.6 no.4
• /
• pp.330-339
• /
• 2006

This paper deals with novel electronic ballast based on single-stage power processing topology using a symmetrical half-bridge inverter and current injection circuit. The half-bridge inverter drives the output parallel resonant circuit and injects current through the power factor correction (PFC) circuit. Because of high frequency current injection and high frequency modulated voltage, the proposed circuit maintains the unity power factor (UPF) with low THD even under wide variation in ac input voltage. This circuit needs minimum and lower sized components to achieve the UPF and high efficiency. This leads to an increase in reliability of ballast at low cost. Furthermore, to reduce cost, the electronic ballast is designed for two series-connected fluorescent lamps (FL). The analysis and experimental results are presented for ($2{\times}36$ Watt) fluorescent lamps operating at 50 kHz switching frequency and input line voltage (230 V, 50 Hz).

• Proceedings of the KIEE Conference
• /
• 2006.04b
• /
• pp.211-215
• /
• 2006

This paper present the Half-Bridge converter for low current output. In converter system, magnetic components are important devices used for energy storage, energy transfer, galvanic isolation and filtering. The proposed Half-Bridge converter is to reduce the number of magnetic components. The secondary rectification was discussed by comparison of center-tap type with primary center-core transformer winding and primary side-core transformer winding. A prototype featuring 400V input, 10V output, 400kHz switching frequency, and 100W output power.

• Proceedings of the KIPE Conference
• /
• 2003.07a
• /
• pp.54-57
• /
• 2003

A new non linear, mean value, instantaneous following control technique to design half bridge converter is proposed in witch control principle uses characteristic that reset time of analog integrator is inverse proportion In input voltage. It is Important characteristic that compensation and follow-up control time are same with switching frequency. Is completed in one cycle that base control frequency. Have excellence characteristic that follow in order instruction value exactly stationary state as well as transient state. Half bridge converter that apply this control principle can know that have stabilize and excellence characteristic. This technique is verified through an experiment, and know that experiment result and theory agree well.

• Proceedings of the KIEE Conference
• /
• 2003.04a
• /
• pp.318-320
• /
• 2003

This paper presents a novel single-stage high frequency resonant DC-DC converter using zero voltage switching with high input power factor. The proposed high frequency resonant converter integrates half-bridge boost rectifier as power factor corrector (PFC) and half-bridge resonant converter into a single stage. The input stage of the half-bridge boost rectifier is working in discontinuous conduction mode(DCM) with constant duty cycle and variable switching frequency. So that a high power factor is achieved naturally. Simulation results through the Pspice have demonstrated the feasibility of the Proposed DC-DC converter. This proposed converter will be able to be practically used as a power supply in various fields as induction heating applications, DC-DC converter etc.

• Journal of Power Electronics
• /
• v.7 no.4
• /
• pp.294-300
• /
• 2007

This paper deals with a design of a bootstrap power supply using snubber energy regeneration, which is used to power a high-side gate driver of a half-bridge circuit. In the proposed circuit, the energy stored in the low-side snubber capacitor is transferred to the high-side bootstrap capacitor without any magnetic components. Thus, the power dissipation in the RCD snubber can be effectively reduced. The operation principle and design method of the proposed circuit are presented. The experimental results are also provided to show the validity of the proposed circuit.

• Proceedings of the KIPE Conference
• /
• 2011.07a
• /
• pp.157-158
• /
• 2011

An active-clamped current-fed half-bridge converter is used for front-end converter for grid-connection of low voltage energy sources. In this paper, theoretical analysis on the loss and efficiency for an active-clamped current-fed half-bridge converter is presented. To analyze the loss of the presented converter, the RMS current of each device is derived and it's loss is calculated. The comparison between simulation result and computed value is presented to verify the validity of the theoretic results.

• Proceedings of the KIPE Conference
• /
• 2011.07a
• /
• pp.163-164
• /
• 2011

In this paper, a new half-bridge zeta converter employing a center-tapped rectifier is proposed. The proposed converter provides a bidirectional powering path in the rectifier. As a result, its improved rectifier voltage waveform reduces the output filter inductor size. Also, it maintains a wide ZVS range due to the characteristic of the conventional single-ended half-bridge zeta converter. The operational principles, the theoretical analysis, and the design considerations of the proposed converter are analyzed. To verify the performance of the proposed converter, experimental results from a 180W prototype are presented.

• Proceedings of the KIPE Conference
• /
• 2011.07a
• /
• pp.23-24
• /
• 2011

In this paper, the 170W LLC half bridge DC-DC converter is designed for the lighting management system. The power conversion circuit consists of PFC and isolated LLC resonant converter. The topology of LLC half bridge resonant converter provides ZVS characteristic. And the stresses of voltage and current is smaller than that of the general resonant converters. So we can expect the higher efficiency. The optimal conditions for high efficiency were investigated through by experiment.

• The Transactions of The Korean Institute of Electrical Engineers
• /
• v.56 no.5
• /
• pp.884-891
• /
• 2007

Comparing with the conventional transformer without the air gap, a contact-less transformer with the large air-gap (4.8cm) between the long primary winding and the secondary winding has the increased leakage inductance and the reduced magnetizing inductance. By the increased leakage inductance and the reduced magnetizing inductance on the primary of the contact-less transformer, a good deal of the primary current circulates through magnetizing inductance, which results in a massive loss and the high voltage gain characteristics for load variations in contact-less power supply (CPS). To consider these characteristics, in this paper, the efficiency characteristics of the contact-less power supply using a series resonant converter is presented, described and verified through theoretical analysis, computer simulation and experimental test of 2.5kW prototype.