• Title/Summary/Keyword: Bridgeless technique

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A Novel Bridgeless Interleaved Power Factor Correction Circuit with Single Current Sensor (단일 전류 센서를 이용하는 새로운 브리지 없는 인터리빙 방식의 역률 보상 회로)

  • Doan, Van-Tuan;Choi, Woojin
    • Proceedings of the KIPE Conference
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    • 2016.07a
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    • pp.363-364
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    • 2016
  • In this paper, a novel bridgeless interleaved power factor correction circuit with single current sensor is proposed. The proposed control strategy requires only one current sensor for the interleaved bridgeless PFC. By sampling the output current, all the boost indictor currents can be calculated and used to control the input current according to the input voltage. The reduced number of current sensors and associated feedback circuits helps reduce the cost of system. The problem caused by the unequal current gain between current sensors inherently does not exist in the proposed topology. Thus, current sharing between converters can be achieved more accurately and the high frequency distortion is decreased. In addition, the proposed technique can be applied to the other kinds of interleaved PFC topologies. Performance of the proposed control strategy is verified by the experimental results with 6.6kW bridgeless interleaved PFC circuit.

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A High Performance Interleaved Bridgeless PFC for Nano-grid Systems

  • Cao, Guoen;Lim, Jea-Woo;Kim, Hee-Jun;Wang, Huan;Wang, Yibo
    • Journal of Electrical Engineering and Technology
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    • v.12 no.3
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    • pp.1156-1165
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    • 2017
  • A high performance interleaved bridgeless boost power factor correction (PFC) rectifier operating under the critical current conduction mode (CrM) is proposed in this paper to improve the efficiency and system performance of various applications, such as nano-grid systems. By combining the interleaved technique with the bridgeless topology, the circuit contains two independent branches without rectifier diodes. The branches operate in interleaved mode for each respective half-line period. Moreover, when operating in CrM, all the power switches take on soft-switching, thereby reducing switching losses and raising system efficiency. In addition, the input current flows through a minimum amount of power devices. By employing a commercial PFC controller, an effective control scheme is used for the proposed circuit. The operating principle of the proposed circuit is presented, and the design considerations are also demonstrated. Simulations and experiments have been carried out to evaluate theoretical analysis and feasibility of the proposed circuit.

Compensation Technique for Current Sensorless Digital Control of Bridgeless PFC Converter under Critical Conduction Mode

  • Kim, Tae-Hun;Lee, Woo-Cheol
    • Journal of Electrical Engineering and Technology
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    • v.13 no.6
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    • pp.2310-2318
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    • 2018
  • Critical conduction mode (CRM) operation is more efficient than continuous conduction mode (CCM) operation at low power levels because of the valley switching of switches and elimination of the reverse recovery losses of boost diodes. When using a sensorless digital control method, an error occurs between the actual and the estimated current. Because of the error, it operates as CCM or discontinuous conduction mode (DCM) during CRM operation and also has an adverse effect on THD of input current. In this paper, a current sensorless technique is presented in an inverter system using a bridgeless boosted power factor correction converter, and a compensation method is proposed to reduce CRM calculation error. The validity of the proposed method is verified by simulation and experiment.

Switching Frequency Modulation Technique to Improve Performance of Bridgeless Rectifier for Wireless Power Transfer System (무선전력전송 시스템의 Bridgeless 정류기 성능 향상을 위한 스위칭 주파수 변조 기법)

  • Son, Won-Jin;Lee, Jae Han;Byun, Jongeun;Lee, Byoung Kuk
    • Proceedings of the KIPE Conference
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    • 2018.07a
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    • pp.42-44
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    • 2018
  • 본 논문에서는 Bridgeless 정류기가 적용된 무선전력전송(Inductive Power System, IPT) 시스템의 성능 향상을 위한 스위칭 주파수의 변조 기법에 대해 제안한다. Bridgeless 정류기의 기존 제어 방식과 제안하는 제어 방식의 동작을 비교하고 3.3kW급 무선전력전송 시스템에 대한 시뮬레이션을 통해 제안하는 제어 방식에 대한 동작을 검증한다. 제안하는 제어 방식의 성능을 검증하기 위해 기존 제어 방식과의 손실을 비교 분석한다.

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An Effective Control Scheme for Battery Charger System in Electric Vehicles

  • Nguyen, Cong-Long;Lee, Hong-Hee
    • Proceedings of the KIPE Conference
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    • 2012.07a
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    • pp.232-233
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    • 2012
  • This paper presents an effective control scheme for an electric vehicle battery charger where a symmetrical bridgeless power factor-corrected converter and a buck converter are cascaded. Both converters have been popular in industries because of their high efficiency, low cost, and compact size, hence combining these converters makes the overall battery charging system strongly efficient. Moreover, this charger topology can operate at universal input voltage and attain a desired battery current and voltage without ripple. In order to achieve a unity input power factor and zero input current harmonic distortion, the proposed control scheme adopts duty ratio feed-forward control technique in both current and voltage control loop. Additionally, in the current loop, its reference is created by a phase-locked loop (PLL) block, leading to a pure sinusoidal input current although the input voltage waveform is being distorted. The feasibility and practical value of the proposed approach are verified by simulation and experiment with an 110V/60Hz ac line input and 1.5kW-72V dc output of the battery charging system.

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