• Title/Summary/Keyword: high efficiency rectifier

Search Result 235, Processing Time 0.031 seconds

High Efficiency and Low Device Stress Voltage and Current Clamping ZVS PWM Asymmetrical Half Bridge Converter

  • Han Sang Kyoo;Moon Gun-Woo;Youn Myung Joong
    • Proceedings of the KIPE Conference
    • /
    • 2004.07a
    • /
    • pp.341-345
    • /
    • 2004
  • A high efficiency and low device stress voltage and current clamping BVS PWM asymmetrical half bridge converter is proposed in this paper. To achieve the ZVS of power switches along the wide load range, the transformer leakage inductor $L_{Ikg}$ is increased. Then, to solve the problem related to ringing in the secondary rectifier caused by the resonance between $L_{Ikg}$ and rectifier junction capacitors, the proposed converter employs a voltage and current clamping cell, which helps voltages and currents of rectifier diodes to be clamped at the output voltage and output current, respectively. Therefore, no RC-snubber for rectifier diodes is needed and a high efficiency as well as low noise output voltage can be realized. In addition, since all energy stored in $L_{Ikg}$ is transferred to the output side, the circulating energy problem can be effectively solved and duty loss does net exist. The operational principle, theoretical analysis, and design considerations are presented. To confirm the operation, validity, and features of the proposed circuit, experimental results from a 425W, 385-170Vdc prototype are presented.

  • PDF

A Study on Efficiency and Characteristic of Zero Voltage Switched Half-Bridge Converter and Forward Converter (영전압 스위칭 하프브리지 컨버터와 포워드 컨버터의 효율 및 특성에 관한 연구)

  • Seo, J.K.;Kim, Y.;Baek, S.H.;Kwon, S.D.
    • Proceedings of the KIEE Conference
    • /
    • 1998.11a
    • /
    • pp.147-149
    • /
    • 1998
  • In this paper, zero voltage switched half bridge converter and an active-clamped, zero voltage switched forward converter equipped with self-driven synchronous rectifier is designed and investigated for high efficiency BC-DC converter. A synchronous rectifier is has a lower conduction power loss than shottky diode rectifier. The purpose of this paper is to investigate the effect of parasitic inductance in a synchronous rectifier of DC-DC converters and examine overall efficiency of zero voltage switched DC-DC converters.

  • PDF

A New Zero-Voltage Switching Three-Level Converter with Reduced Rectifier Voltage Stress (결합 인덕터를 적용한 고효율 3레벨 컨버터)

  • Kim, Keon-Woo;Han, Jung-Kyu;Moon, Gun-Woo
    • The Transactions of the Korean Institute of Power Electronics
    • /
    • v.24 no.6
    • /
    • pp.406-410
    • /
    • 2019
  • Three-level (3L) DC-DC converters are appropriate for high-input-voltage applications. Although the voltage stress of TL converter switches can be reduced to half of the input voltage, the primary side has a large circulating current, which degrades efficiency. In this study, a dual half-bridge cascaded TL converter is presented to reduce this circulating current and thus decrease the conduction loss of the primary circuit. Moreover, the proposed converter can reduce the voltage stress of rectifier diodes, thereby reducing their conduction loss. Therefore, efficiency can be improved by reducing the conduction loss of the primary circuit and rectifier diodes.

High Efficiency and High Power-Factor Power Supply for LED Lighting Equipment (고효율 고역률 LED 조명장치용 전원공급장치)

  • Jeong, Gang-Youl
    • The Journal of Korean Institute of Information Technology
    • /
    • v.16 no.11
    • /
    • pp.23-34
    • /
    • 2018
  • This paper presents the high efficiency and high power-factor power supply for LED lighting equipment. The proposed power supply is the single-stage power structure consisted of the full-bridge diode rectifier and flyback converter, and thus the power-factor correction and output voltage regulation are performed simultaneously using only one controller IC and one power semiconductor switch. Furthermore, the proposed power supply reduces the voltage stress and switching loss of main switch using the regenerative snubber, and it improves the system efficiency using the synchronous rectifier. The applied synchronous rectifier is the new voltage-driven type and its operation and construction are simple. In this paper, the operation principle of proposed power supply is explained through the operation analyses of its power-factor correction and main power conversion parts and the operation of synchronous rectifier is described, briefly. Also, a design example of the power circuit of 40W-class prototype is shown and the operation characteristics of proposed power supply are validated through the experimental results of the implemented prototype by the designed circuit parameter.

A New High Efficiency Power Factor Correction PWM Rectifier with Reduced Conduction Loss and No Auxiliary Switches (새로운 고효율 역율보상 단상 PWM AC/DC 컨버터)

  • Kim, In-Dong
    • Journal of Fisheries and Marine Sciences Education
    • /
    • v.9 no.2
    • /
    • pp.209-221
    • /
    • 1997
  • This paper presents a soft switching unity power factor PWM rectifier, which features reduced conduction losses and soft switching with no auxiliary switches. The soft switching are achieved by using a simple commutation circuit with no auxiliary switches, and reduced conduction loses are achieved by employing a single converter, instead of a typical front end diode rectifier followed by a boost rectifier. Furthermore, thanks to good features such as simple PWM control at constant frequency, low switch stress and low VAR rating of commutation circuits, it is suitable for high power applications. The principle of operation is explained in detail, and major characteristics analysis and experimental results of the new converter also included.

  • PDF

A Flyback DC-DC Converter Employing a Synchronous Rectifier Driven by a New Voltage/Current Mixed Method (전압 전류 혼합구동방식을 적용한 동기정류기형 플라이백 DC-DC 컨버터)

  • Lee, Darl-Woo;Ahn, Tae-Young
    • The Transactions of the Korean Institute of Electrical Engineers B
    • /
    • v.55 no.9
    • /
    • pp.472-477
    • /
    • 2006
  • This paper presents a new voltage/current mixed method for driving synchronous rectifiers (SR) adapted to the flyback topology. The synchronous rectifier driven by the proposed voltage/current mixed method can operate at a wide load range with high efficiency. The gate voltage of MOSFET in the synchronous rectifier can be easily controlled by changing the ratio of resistors, irrespective of a line and load fluctuation. A 200W (12V/17A) prototype converter was built and an efficiency of 93% was measured at 10A load current.

The Development of the High-efficiency Rectifier on Marine Metallic Structures(II) (해양금속구조물의 전기방식을 위한 고효율 정류기 개발(II))

  • Ha, Tae-Hyun;Bae, Jeong-Hyo;Kim, Dae-Kyeong;Lee, Hyun-Goo;Choi, Sang-Bong;Jeong, Seong-Hwan
    • Proceedings of the KIEE Conference
    • /
    • 2000.11d
    • /
    • pp.727-728
    • /
    • 2000
  • The Cathodic Protection system which is usually applied to marine metallic structures in domestic is Sacrificial Anode Method. In general. low efficiency rectifiers are using in the field of Cathodic Protection. These rectifiers are not only low efficiency but also manual type which is not able to control remotely. In this paper we describe the high efficiency rectifier used the high speed switching method for optimum corrosion control of marine metallic structures.

  • PDF

The Development of the High-efficiency Rectifier on Marine Metallic Structures (해양금속구조물의 전기방식을 위한 고효율 정류기 개발)

  • Ha, Tae-Hyun;Kim, Dae-Kyeong;Bae, Jeong-Hyo;Lee, Hyun-Goo;Choi, Sang-Bong;Jeong, Seong-Hwan
    • Proceedings of the KIEE Conference
    • /
    • 2000.07d
    • /
    • pp.3130-3132
    • /
    • 2000
  • The Cathodic Protection system which is usually applied to marine metallic structures in domestic is Sacrificial Anode Method. In general, low efficiency rectifiers are using in the field of Cathodic Protection. These rectifiers are not only low efficiency but also manual type which is not able to control remotely. In this paper we describe the high efficiency rectifier used the high speed switching method for optimum corrosion control of marine metallic structures.

  • PDF

A Study on the Efficiency Prediction of Low-Voltage and High-Current dc-dc Converters Using GaN FET-based Synchronous Rectifier (GaN FET 기반 동기정류기를 적용한 저전압-대전류 DC-DC Converter 효율예측)

  • Jeong, Jea-Woong;Kim, Hyun-Bin;Kim, Jong-Soo;Kim, Nam-Joon
    • The Transactions of the Korean Institute of Power Electronics
    • /
    • v.22 no.4
    • /
    • pp.297-304
    • /
    • 2017
  • The purpose of this paper is to analyze losses because of switching devices and the secondary side circuit diodes of 500 W full bridge dc-dc converter by applying gallium nitride (GaN) field-effect transistor (FET), which is one of the wide band gap devices. For the detailed device analysis, we translate the specific resistance relation caused by the GaN FET material property into algebraic expression, and investigate the influence of the GaN FET structure and characteristic on efficiency and system specifications. In addition, we mathematically compare the diode rectifier circuit loss, which is a full bridge dc-dc converter secondary side circuit, with the synchronous rectifier circuit loss using silicon metal-oxide semiconductor (Si MOSFET) or GaN FET, which produce the full bridge dc-dc converter analytical value validity to derive the final efficiency and loss. We also design the heat sink based on the mathematically derived loss value, and suggest the heat sink size by purpose and the heat divergence degree through simulation.