• Title/Summary/Keyword: AC-AC 컨버터

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High power 31 level Single Phase AC/DC Converter (대용량 21 레벨 단상 AC/DC 컨버터)

  • 전중함
    • 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

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AC-DC Converter with 500W class for Plasma display panel (플라즈마 디스플레이용 500W급 AC-DC 컨버터)

  • Kang, Won-Suck;Ahn, Tae-Yuong
    • Proceedings of the KIEE Conference
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    • 2004.10a
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    • pp.139-142
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    • 2004
  • Recently the PDP is the most remarkable media for a next generation display device. In this paper, we proposed the PDP dedicated AC-DC converter using quasi resonant method because the PDP has a lot of power dissipation so we need to develope. The proposed converter using one transformer has soft switching and a advantage to lower voltage stress in switch and also is predicted to have high power efficiency, we proposed the principles and theory using the zero voltage switching and verified the validity through a experiment.

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AC/DC Converter for 100W Rated LED Driver with Minimized Filter Capacitor (필터커패시터 용량을 최소화한 100W급 조명용 LED 구동 AC/DC 컨버터)

  • Park, H.Y.;Jung, J.H.;Kim, H.S.;Nho, E.C.;Kim, I.D.;Kim, H.G.;Chun, T.W.
    • Proceedings of the KIPE Conference
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    • 2011.07a
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    • pp.9-10
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    • 2011
  • This paper describes a control method to minimize the filter capacitor of a AC/DC converter for LED driver. The rectified secondary voltage of the transformer has 120Hz ripple unlike the conventional converter for the LED drive. Therefore, the filter capacitor can be minimized and this provides reduced cost, low switching loss, and long life of the converter.

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An Improvement On-Line Failure Diagnosis of DC Link Capacitor in PWM Power Converters (PWM 전력 컨버터에서 DC 링크 커패시터의 개선된 온라인 고장 진단)

  • Shon, Jin-Geun;Na, Chae-Dong
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.59 no.1
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    • pp.40-46
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    • 2010
  • DC link electrolytic capacitors are widely used in various PWM power converter system, such as adjustable speed driver(ASD) or DC/DC converter. Electrolytic capacitors, which is the most of the time affected by aging effect, plays a very important role for the power electronics system quality and reliability. This objective of this paper is to propose a improvement method to detect the rise of equivalent series resistor(ESR) in order to realize the online failure prediction of electrolytic capacitor for DC link of PWM power converter. The ESR detection scheme is based on the determination of the electrolytic capacitor AC losses calculated from voltage/current measurement using AC coupling. Therefore, the preposed online failure prediction method has the merits of easy ESR computation and circuit simplicity compare with BPF method. Simulation results show the veridity of the proposed on-line ESR estimation method.

Modeling and Analysis of Active-Clamp, Full-Bridge Boost Converter (능동 클램프 풀브릿지 부스트 컨버터에 대한 모델링 및 분석)

  • Kim Marn-Go
    • Proceedings of the KIPE Conference
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    • 2004.07b
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    • pp.610-614
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    • 2004
  • Recently, an active-clamp, full-bridge boost converter has been actively studied for high-power applications such as power factor correction and battery discharger. However, DC and AC modeling for this converter has not conquered. In this paper, a DC and small-signal AC modeling for the active-clamp, full-bridge boost converter is described. Based on the operation principle, the ac part of the converter can be replaced by a do counterpart. Then, a conceptual equivalent circuit is derived by rearranging the switches. The equivalent circuit for this converter consists of CCM (Continuous conduction mode) boost and DCM (Discontinuous conduction mode) buck converter. The analyses for the equivalent CCM boost and DCM buck converter are done using the model of PWM switch. The theoretical modeling results are confirmed through experiment or SIMPLIS simulation.

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High Density Power Supply with Flat Transformer (Flat Transformer 적용한 고밀도 전원장치)

  • Ryu M. H.;Baek J. W.;Kim J. H.;Yoo D. W.;Rim G. H.
    • Proceedings of the KIPE Conference
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    • 2004.07b
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    • pp.709-712
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    • 2004
  • 본 논문에서는 고밀도 전원 장치에 적합한 플랫 트랜스포머(Flat Transformer)를 사용하여 다양한 출력을 갖는 AC/DC 변환장치의 설계 예를 제시하였다. 기존의 트랜스포머에 비해 플랫 트랜스포머는 다수의 트랜스포머를 병렬로 구성하여 제작하고, 이차 권선이 항상 1턴으로 구성되므로 누설 인덕턴스가 크게 감소하게 되어 고주파 스위칭에 적합한 형태를 가지고 있다. 일차측 AC/DC 변환기는 고조파 규제를 만족시키기 위해 경계 모드 (Boundary Mode)에서 동작하는 역률 보상회로로 구성하여 설계하였으며, 이차측 DC/DC 변환기는 플랫 트랜스포머에 적당한 하프 브리지(Half-Bridge) 컨버터를 적용하였다. 본 논문에서는 500W급 AC/]DC 변환기를 구성하여 다양한 출력을 갖는 전원 장치를 설계/제작하였다.

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A Novel Diagnosis and Compensation Scheme for AC-DC Converters under Switching Fault Status (AC-DC 컨버터의 고장 시 진단 및 보상기법)

  • Lee Byoung-Kuk;Baek Ju-Won;Yoo Dong-Wook;Rim Gun-Hee
    • Proceedings of the KIPE Conference
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    • 2004.07b
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    • pp.533-536
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    • 2004
  • In this paper, a novel compensation scheme for ac-dc pwm converters under switching device fault status has been proposed, along with an effective diagnosis method. With the proposed scheme, the pwm converter can be properly operated even when one of the switching devices of the converter is out of control, so that it may ensure the performance and reliability of pwm converters to be increased. The developed scheme is explained in theoretically and the validity is verified by the informative simulation and experimental results in detail.

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Low-Frequency Harmonic Eliminations on DC/AC Sides of a 3 Phase-Controlled Converter (3상 제어컨버터의 노치법에 의한 출력과 입출력의 저고조파 제거)

  • 홍성태;권순결;이현우;서기영;임근희
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.43 no.6
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    • pp.906-915
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    • 1994
  • Line-Current harmonics resulting from ac to dc power conversion interfere with power system operation and reduce power factor, hence resulting in increasing power source unnecessarily. This study describes a 3 phase phase-controlled converter eliminating low frequency harmonics in the output by inserting notches. Notch points are calculated by Newton-raphson method, The impacts of the choppings on ac and dc sides are analyzed in the steady state. Potential applications of the study are dc motor controls, high power dc power supplies for telecommunications, static var compensators and HVDC.

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A Study on the Average Current-Mode Control AC/DC ZVT-Boost Converter with Active-Clamp Method (능동 클램프 방식을 이용한 AC/DC ZVT 승압형 컨버터의 평균전류모드 제어에 관한 연구)

  • Bae, Jin-Yong;Kim, Yong;Kim, Pill-Soo;Lim, Nam-Hyuk;Yoon, Suk-Ho;Chang, Sung-Won
    • Proceedings of the KIEE Conference
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    • 2001.07b
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    • pp.1005-1008
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    • 2001
  • This paper presents average current-mode control AC/DC ZVT(Zero Voltage Transition) Boost Converter. This boost converter perceives feed forward signal of input and feedback signal of output for average current-mode control proposed converter employs active-clamp method for ZVT. This converter gives the good PFC(Power Factor Correction), low line current hormonic distortions and tight output voltage regulations. This converter also has a high efficiency by active-clamp method. The principle of operation, feature, and design considerations are illustrated and verified through the experiment with a 150W, 120kHz prototype converter.

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The High Power AC-DC Buck Converter of High Efficienty Using Loss-Less Snubber (로스레스 스너버를 사용한 고효율의 대용량 AC-DC 강압형 컨버터)

  • 문상필;서기영;이현우
    • Proceedings of the IEEK Conference
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    • 1998.06a
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    • pp.951-954
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    • 1998
  • This paper proposed that a high power AC-DC buck converter topology of high efficiency using loss-less snubber operates with four chopper connecting a number of parallel circuit. To improve these, a large number of soft switching topologies included a resonant circuit have been proposed. And, some simulative resutls on computer is included to confirm the validity of the analytical results. The partial resonant circuit makes use of a inductor using step-down and a condenser of loss-less snubber. The result is that the switching loss is very low and the efficiency of system is high. And the snubber condenser used in partial resonant circuit makes charging energy regenerated at input power source of rresonant operation. The proposed conversion system is deemed the most suitable for high power applications where the power switching devices are used.

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