• Title/Summary/Keyword: auxiliary switching circuit

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A New Control Scheme of Class-E Electronic Ballast with Low Crest Factor

  • Chon, Hyun-Son;Lee, Dong-Yun;Hyun, Dong-Seok
    • Journal of Power Electronics
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    • v.3 no.3
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    • pp.175-184
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    • 2003
  • In this paper, a new control scheme of Class-E inverter for reducing the crest factor of electronic ballasts for fluorescent lamps using Pulse-Frequency-Modulation (PFM) is Introduced The lifetime of the lamps is guaranteed by decreasing the lamp crest factor and also voltage stress of the switch is significantly decreased by a new scheme although conventional Class-E Inverter is used In this paper. The proposed PFM control scheme didn't use any auxiliary circuit. The proposed control strategy is executed by feeding back the Input voltage, and the zero-voltage-switching (ZVS) is ensured by maintaining constant turn-off time of the switch Therefore, the control principles of proposed method are explained in detail and its validity is verified through several simulations and experimental results.

A Study on the Interleaved Active-Clamping Forward Converter (인터리브 방식을 이용한 액티브 클램핑 포워드 컨버터에 관한 연구)

  • Jung, Jae-Yeop;Kim, Yong;Kwon, Soon-Do;Bae, Jin-Yong;Lee, Dong-Hyun
    • Proceedings of the KIEE Conference
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    • 2009.04b
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    • pp.156-160
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    • 2009
  • This paper presents the interleaved active-clamping ZVS(Zero Voltage Switching) forward converter, which is mainly composed of two active-clamping forward converters. Only two switches are required, and each one is the auxiliary switch for the other. The circuit complexity and cost are thus reduced. The leakage inductance of the transformer or an additional resonant inductance is employed to achieve ZVS during the dead times. The duty cycles are not limited to be equal and within 50%. The complementary switching and the resulted interleaved output inductor currents diminish the current ripple in output capacitors. Accordingly, the smaller output chokes and capacitors lower the converter volume and increase the power density. Detailed analysis and design of this new interleaved active-clamping forward converter are described.

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Zero-Voltage-Transition Buck Converter for High Step-Down DC-DC Conversion with Low EMI

  • Ariyan, Ali;Yazdani, Mohammad Rouhollah
    • Journal of Power Electronics
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    • v.17 no.6
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    • pp.1445-1453
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    • 2017
  • In this study, a new zero-voltage transition (ZVT) buck converter with coupled inductor using a synchronous rectifier and a lossless clamp circuit is proposed. The regular buck converter with tapped inductor has extended duty cycle for high step-down applications. However, the leakage inductance of the coupled inductor produced considerable voltage spikes across the switch. A lossless clamp circuit is used in the proposed converter to overcome this problem. The freewheeling diode was replaced with a synchronous rectifier to reduce conduction losses in the proposed converter. ZVT conditions at turn-on and turn-off instants were provided for the main switch. The synchronous rectifier switch turned on under zero-voltage switching, and the auxiliary switch turn-on and turn-off were under zero-current condition. Experimental results of a 100 W-100 kHz prototype are provided to justify the validity of the theoretical analysis. Moreover, the conducted electromagnetic interference of the proposed converter is measured and compared with its hard-switching counterpart.

Characteristics Analysis of Soft Switching PWM Converter Using a New Active Snubber (새로운 액티브 스너버를 이용한 소프트 스위칭 PWM 컨버터의 특성해석)

  • Cho, Man-Chul;Mun, Sang-Pil;Kim, Chil-Ryong;Suh, Ki-Young;Kwon, Soon-Kurl
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.21 no.3
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    • pp.44-49
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    • 2007
  • This paper proposes converter that new soft switching active snubber circuit is added, the resonance energy return to life rate doing maximum whole efficiency increase. Proposed converter adds auxiliary switch and resonance inductor, resonance capacitor, two diodes to existing converter, all switch elements play turn-on/turn-off under soft switching condition and minimized switching losses. Conduction loss department is that watch layer bringing back to life resonance energy by input perfectly. These result proved through simulation and an experiment.

Analysis on the Control-Loop Characteristics of Flyback Converter with Magnetic Amplifier (자기증폭기를 이용한 플라이백 컨버터의 제어루프 특성분석)

  • Kim, Cherl-Jin;Hong, Dae-Shik;Yoon, Sin-Yong;Kim, Young-Tae
    • Proceedings of the KIEE Conference
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    • 2003.10b
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    • pp.213-215
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    • 2003
  • The continuing need for more compact and reliable switching power supplies have aroused a renewed interest in a well founded control technique the Magnetic Amplifier(Magamp). Magamp have some advantages of higher power density simple control circuit, good regulation, high frequency and high performance. The control method with magamp become attractive solutions for high current post regulated output applications. In this study, it is proposed that the magamp technique in flyback converters with multiple output windings. Operation principle of the proposed approach is described and a description of magamp control loop behavior is given first from a circuit level point of view. Then the focus is shifted to look at the same issue from the block diagram point of view. Experimental verifications on 50W multiple output flyback converter are conducted. Simulations and experimental results show that the proposed approach is high efficiency and voltage regulation of the auxiliary output is excellent.

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A phase controlled electronic stater for single phase induction motor (단상유도전동기의 위상제어방식 전자식 기동기 개발)

  • Baik W.S.;Kim N.H.;Kim D.H.;Kim M.H.;Choi K.H.;Hwang D.H.;Lim B.E.
    • Proceedings of the KIPE Conference
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    • 2003.07a
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    • pp.201-203
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    • 2003
  • This paper presents a simple electronic stater for single phase induction motor(SPIM). To obtain a starting torque, the phase angle of the auxiliary winding is controlled using simple gate trigger control circuit. Because of this electronic stater circuit consists of some passive element and switching device, it is simple and robust. The experimental result shows some good results, and verifies the proposed electronic starter.

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Circuit Properties of Zero-Voltage-Transition PWM Converters

  • Ostadi, Amir;Gao, Xing;Moschopoulos, Gerry
    • Journal of Power Electronics
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    • v.8 no.1
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    • pp.35-50
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    • 2008
  • A zero-voltage-transition (ZVT) pulse width modulated (PWM) converter is a PWM converter with a single main power switch that has an auxiliary circuit to help it turn on with zero-voltage switching (ZVS). There have been many ZVT-PWM converters proposed in the literature as they are the most popular type of ZVS-PWM converters. In this paper, the properties and characteristics of several types of ZVT-PWM converters are reviewed. A new type of ZVT-PWM converter is then introduced, and the operation of a sample converter of this type is explained and analyzed in detail. A procedure for the design of the converter is presented and demonstrated experimentally. The feasibility of the new converter is confirmed with results obtained from an experimental prototype. Conclusions on the performance of ZVT-PWM converters in general are made based on the efficiency results obtained from the experimental prototypes of various ZVT-PWM converters of different types.

A new low-cost energy-recovery circuit for a plasma display panel (PDP을 위한 새로운 저가형 에너지 회수 회로)

  • Kim Tae-Sung;Choi Seong-Wook;Moon Gun-Woo;Youn Myung-Joong
    • Proceedings of the KIPE Conference
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    • 2006.06a
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    • pp.68-70
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    • 2006
  • A new low-cost energy-recovery circuit (ERC) for a plasma display panel (PDP) is proposed. It has two auxiliary switches clamped on a half sustain voltage, and inductor currents are built up before the PDP is charged and -discharged. Therefore, it features a low cost, fully charged/discharged PDP, zero voltage switching (ZVS), low electromagnetic interference (EMI), low current stress, no severe voltage notch, and high energy-recovery capability.

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Implementation of a ZVT-PRT Algorithm for Current Controlled Inverters using a Digital Signal Processor (DSP를 이용한 전류제어형 인버터의 ZVT-PRT 알고리즘의 구현)

  • Lee S. R.;Jeon C. H.;Kim S. S.
    • Proceedings of the KIPE Conference
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    • 2002.07a
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    • pp.326-329
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    • 2002
  • In this paper, a single-phase inverter using a diode bridge-type resonant circuit to implement ZVT(Zero Voltage Transition) switching is presented. The current control algorithm is analyzed about how to design the circuit with auxiliary switch which can ZVT operation for the main power switch. The simulation and experimental results would be shown to verify the proposed current algorithm, because the main power switch is turn on with ZVT and the hi-directional inverter is operated.

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Single Stage Power Factor Correction Using A New Zero-Voltage-Transition Isolated Full Bridge PWM Boost Converter

  • Jeong, Chang.-Y.;Cho, Jung-G.;Baek, Ju-W.;Song, Du-I.;Yoo, Dong-W.
    • Proceedings of the KIPE Conference
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    • 1998.10a
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    • pp.694-700
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    • 1998
  • A novel zero-voltage-transition (ZVT) isolated PWM boost converter for single stage power factor correction (PFC) is presented to improve the performance of the previously presented ZVT converter[8]. A simple auxiliary circuit which includes only one active switch provides zero-voltage-switching (ZVS) condition to all semiconductor devices. (Two active switches are required for the previous ZVT converter) This leads to reduced cost and simplified control circuit comparing to the previous ZVT converter. The ZVS is achieved for wide line and load ranges with minimum device voltage and current stresses. Operation principle, control strategy and features of the proposed converter are presented and verified by the experimental results from a 1.5 kW, 100 KHz laboratory prototype.

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