• Title/Summary/Keyword: zero-current switching (ZCS)

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Soft Switching High Power Factor Buck Converter (Soft Switching방식 고역률 강압형 컨버터)

  • 구헌회;조기연
    • Proceedings of the KIPE Conference
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    • 1997.07a
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    • pp.243-246
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    • 1997
  • In this paper, soft switching high power factor buck converter is proposed. This converter is composed of diode rectifier, a input capacitor can be small enough to filter input capacitor can be small enough to filter input current, buck converter with loss less snubber circuit. Converter is operated in discontinous conduction mode, turn of of the switching device is a zero current switching(ZCS) and high power factor input is obtained. In addition, zero voltage switching(ZVS) at turn of is achieved and switching loss is reduced using loss less snubber circuit. The capacitor used in the snubber circuit raised output voltage. Therefore, proposed converter has higher output voltage and higher efficiency than conventional buck type converter at same duty factor in discontious conduction mode operation.

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Soft switching high power factor buck converter using loss less snubber circuit (무손실 스너버 회로를 이용한 소프트 스위칭 강압형 고역률 컨버터)

  • 구헌회;변영복;김성철;서기영;이현우
    • Journal of the Korean Institute of Telematics and Electronics S
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    • v.34S no.6
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    • pp.77-84
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    • 1997
  • buck type converter doesn't appear when an input voltag eis lower than an output voltage. This is the main reason the buck converter has not been used for high power factor converters. In this paper, soft switching high power factor buck converter is proposed. This converter is composed of diode rectifier, input capacitor can be small enough to filter input current, buck converter with loss less snubber circuit. Converter is operated in discontinous conduction mode, turn on of the switching device is a zero current switching (ZCS) and high powr factor input is obtianed. In addition, zero voltage switching (ZVS) at trun off is achieved and switching loss is reduced using loss less snubber circuit. The capacitor used in the snubber circuit raised output voltage. Therefore, proposed converter has higher output voltage and higher efficiency than conventional buck type converter at same duty factor in discontinous conduction mode operation. High power factro, efficiency, soft switching operation of proposed converter is veified by simulation using Pspice and experimental results.

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Energy Recovery Circuit for the Plasma Display Panel Sustainer

  • Cho, B.H.;Kim, W.S.
    • 한국정보디스플레이학회:학술대회논문집
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    • 2005.07a
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    • pp.625-630
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    • 2005
  • In this paper, several energy recovery circuits (ERC) for the plasma display panel (PDP) are reviewed and classified in a manner of operation characteristics. A typical ERC using the Regenerative Transformer (RT) is introduced and compared with conventional ones. RT-ERC can achieve zero-voltage-switching (ZVS) for main full-bridge switches and zero-current-switching (ZCS) for the resonant switches and diodes. The charging/discharging energy of panel capacitance is efficiently recovered with the RT and without a sub-circuit. The presented circuit is verified with simulation and experimental results.

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Single-Stage Single-Phase Integrated ZCS Quasi-Resonant Power Factor Preregulator Based on Forward Topology (단일 전력단 단상 공진형 영전류 스위칭 역률 개선 회로)

  • 구관본;이준영;윤명중
    • Proceedings of the KIPE Conference
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    • 1999.07a
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    • pp.639-642
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    • 1999
  • An integrated zero current switching(ZCS) quasi-resonant converter(QRC) for power factor correction and high efficiency with single switch is proposed in this thesis. Boost integrated circuit operating discontinuous conduction mode(DCM) and QRC are used for power factor correction and reducing switching loss, respectively. A prototype converter has been designed and experimented. At rated condition, the THD in the input current waveform of this prototype has approximately 18%. The efficiency is obtained about 70%, the power factor is about 0.985 as well. Therefore, the proposed converter is suitable for a low power level converter with operating switching frequency above several hundred KHz.

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Switched discrete sliding mode control for ZCS series rosonant AC to DC converter (영전류 스위칭 방식의 직렬 공진형 AC/DC 컨버터를 위한 전환모드 이산 슬라이딩 제어)

  • 문건우;이정훈;이대식;윤명중
    • 제어로봇시스템학회:학술대회논문집
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    • 1993.10a
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    • pp.1219-1226
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    • 1993
  • A buck-boost zero current switched(ZCS) series resonant AC to DC converter for the DC output voltage regulation together with high power factor is proposed. The proposed single phase AC to DC converter enables a zero current switching operation of all the power devices allowing the circuit to operate at high swtiching frequencies and high power levels. A dynamic model for this Ac to DC converter is developed and an analysis for the internal operational characteristics is explored. Based on this analysis, a switched discrete sliding mode control(SDSMC) technique is investigated and its advantages over the other types of current control techniques are discussed. With the proposed control technique, the unity power factor without a current overshoot and a wide range of output voltage can be obtained.

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Improved Zero-Current- Transition (ZCT) PWM Switch Cell (개선된 영전류 과도상태 PWM 스위치 셀)

  • Choi, Hang-Seok;Cho, B.H.
    • Proceedings of the KIEE Conference
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    • 2001.07b
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    • pp.950-952
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    • 2001
  • This paper proposes a new zero-current transition (ZCT) pulse-width modulation (PWM) switch cell that overcomes the limitations of the conventional ZCT converters. The proposed ZCT cell provides zero-current-switching (ZCS) condition for the main switch and the auxiliary switch. The conduction loss and current stress of the main switch are minimized, since the circulating current for the soft switching does not flow through the main switch. The proposed ZCT PWM switch cell is suitable for the high power applications employing IGBTs. Design guidelines with a design example are described and verified by experimental results from the 1 kW prototype boost converter operating at 70kHz.

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Improved Dual-Path Energy Recovery Circuit using a Current Source and a Voltage Source for High Resolution and Large-Sized Plasma Display Panel

  • Yi, Kang-Hyun;Moon, Gun-Woo
    • Proceedings of the KIPE Conference
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    • 2008.06a
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    • pp.544-546
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    • 2008
  • An improved dual-path energy recovery circuit (ERC) using a current source and a voltage source for plasma display panel (PDP) is proposed. The proposed ERC uses the voltage source to charge a panel and the current source to discharge the panel. Thus, the proposed circuit can make the panel charge to $V_S$ and discharge to 0V, fully and it is possible to achieve zero voltage switching (ZVS) of all switches in H-bridge inverter and zero current switching (ZCS) of all switches in the ERC. Moreover, it has less conduction and switching loss in ERC devices by the dual energy recovery paths for charging and discharging the panel. Furthermore, it has features of canceling the gas discharge current, high performance and the low cost ERC components. The operation principle and features of the proposed ERC are presented in detail and verified with 42-inch SD PDP.

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Three Level DC/DC Converter Using Energy Recovery Snubber (에너지 회생 스너버를 적용한 3레벨 DC/DC 컨버터)

  • 조용현;김윤호;김은수
    • The Transactions of the Korean Institute of Power Electronics
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    • v.6 no.1
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    • pp.64-73
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    • 2001
  • This paper presents a Zero Voltage and Zero Current Switching (ZVZCS) 3-Level DC/DC converter. This converter overcomes the drawbacks presented by the conventional Zero Voltage Switching(ZVS) 3-Level converter, such as high circulating energy, severe parastic ringing on the rectifier diodes, and limited ZVS load range for the inner switches. The converter presented in this paper uses a phase shift control with a flying capacitor in the primary side to achieve ZVS for the outer switches. Additionally, the converter uses an energy recovery snubber to reset the primary current during the free-wheeling stage to achieve ZCS for the inner switches. The proposed converters are analyzed and verified on 6kW, 39kHz experimental prototype.

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Study on Resonant PWM Switching Technique for $3{\phi}$ Boost AC/DC Converter with High Power Factor and Less Switching Loss (3상 승압형 AC/DC 컨버터의 고역율과 스위칭 손실 저감을 위한 공진 PWM 스위칭 기법에 관한 연구)

  • Yi, Eun-Gyu;Noh, Yung-Nam;Kim, Beung-Jin;Jeon, Hee-Jong
    • Proceedings of the KIEE Conference
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    • 1997.11a
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    • pp.541-543
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    • 1997
  • In this paper, a proposed resonant PWM switching technique makes the boost AC/DC converter to high input power factor and less switching loss. Also, the switching control scheme is used which minimize harmonic components employing novel PWM technique. In addition, an employment of resonant circuit for switching makes zero current switching(ZCS) and zero voltage switching(ZVS) for control switches without switching losses. The result shows that high power factor is still for varying load and switching loss is very low.

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Design of a 2KW Soft-Switching ZVT Power Factor Correction Converter with Active Snubbers (능동 스너버를 갖는 2KW 소프트 스위칭 ZVT 역률 보정 컨버터 설계)

  • Park, Gyeong-Su;Kim, Yun-Ho
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.50 no.9
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    • pp.473-478
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    • 2001
  • In this paper a soft switching ZVT(Zero Voltage Transition) power factor converter using active snubbers is designed to improve efficiency and reduce voltage spike and parasitic ringing. The main switch achieves ZVT and the auxiliary switch operates with ZCS. A 2KW soft switching ZVT converter is designed with switching frequency 100kHz, output voltage 400VDC. Then the designed system is realized and experimental results show that the measured efficiency and power factor are over 97.45% and 0.997 respectively with an input current THD less than 3%.

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