Zero Current Switching

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Xinbo Ruan - One of the best experts on this subject based on the ideXlab platform.

  • Zero voltage and Zero Current Switching pwm combined three level dc dc converter
    IEEE Transactions on Industrial Electronics, 2010
    Co-Authors: Fuxin Liu, Jiajia Yan, Xinbo Ruan
    Abstract:

    This paper proposes a Zero-voltage and Zero-Current-Switching (ZVZCS) PWM combined three-level (TL) dc/dc converter, which is a combination of a ZVZCS PWM TL converter with a ZVZCS PWM full-bridge converter. The proposed converter has the following advantages: all power switches suffer only half of the input voltage; the voltage across the output filter is very close to the output voltage, which can reduce the output filter inductance significantly; and the voltage stress of the rectifier diodes is reduced too, so that the converter is very suitable for high input voltage and wide input voltage range applications. The converter also can achieve Zero-voltage-Switching for the leading switches and ZCS for the lagging switches in a wide load range to achieve higher efficiency. The design considerations and procedures are presented in this paper. The operation principle and characteristics of the proposed converter are analyzed and verified on a 400-800-V input and 54-V/20-A output prototype.

  • Zero-voltage and Zero-Current-Switching PWM hybrid full-bridge three-level converter
    IEEE Transactions on Industrial Electronics, 2005
    Co-Authors: Xinbo Ruan
    Abstract:

    This paper proposes a Zero-voltage and Zero-Current-Switching pulsewidth modulation hybrid full-bridge three-level (ZVZCS PWM H-FB TL) converter, which has a TL leg and a two-level leg. The voltage stress of the switches of the TL leg is half of the input voltage, and the switches can realize ZVS, so MOSFETs can be adopted; the voltage stress of the switches of the two-level leg is the input voltage, and the switches can realize ZCS, so IGBT can be adopted. The secondary rectified voltage is a TL waveform having lower high-frequency content compared with that of the traditional FB converters, which leads to the reduction of the output filter inductance. The input Current of the converter has quite little ripple, so the input filter can also be significantly reduced. The operation principle of the proposed converter is analyzed and verified by the experimental results. Several ZVZCS PWM H-FB TL converters are also proposed in this paper.

  • Zero-voltage and Zero-Current-Switching PWM hybrid full-bridge three-level converter
    2002 IEEE 33rd Annual IEEE Power Electronics Specialists Conference. Proceedings (Cat. No.02CH37289), 2002
    Co-Authors: Xinbo Ruan
    Abstract:

    This paper proposes a Zero-voltage and Zero-Current-Switching PWM hybrid full-bridge three-level converter (ZVZCS PWM H-FB TL converter), which has a three level (TL) leg and a two-level leg. The voltage stress of the switches of the TL leg is half of the input voltage, and the switches can realize ZVS, so the MOSFET can be adopted. The voltage stress of the switches of the two-level leg is the input voltage, and the switches can realize ZCS, so IGBT can be adopted. The secondary rectified voltage is a TL waveform having lower high-frequency content compared with that of the traditional FB converters, which leads to the reduction of the output filter inductance. The input Current of the converter has quite low ripple, the input filter can also be significantly reduced. The operation principle of the proposed converter is analyzed and verified by the experimental results. Several ZVZCS PWM H-FB TL converters are also proposed in this paper.

  • a novel Zero voltage and Zero Current Switching pwm full bridge converter using two diodes in series with the lagging leg
    IEEE Transactions on Industrial Electronics, 2001
    Co-Authors: Xinbo Ruan
    Abstract:

    This paper proposes a novel phase-shifted Zero-voltage and Zero-Current-Switching (ZVZCS) pulsewidth modulation full-bridge converter, which realizes ZVS for the leading leg and ZCS for the lagging leg. A blocking capacitor is added in series with the primary winding of the transformer to make the primary Current decay to Zero during Zero state to ensure ZCS for the lagging leg. In order to prevent the primary Current from reversing during Zero state, two diodes in series with the lagging leg are added. The principle of operation, steady-state analysis, and design procedures are presented. The experimental results are also included to verify the theoretical analysis.

Guangfu Ning - One of the best experts on this subject based on the ideXlab platform.

  • a novel zcs full bridge pwm converter with simple auxiliary circuits
    International Power Electronics and Application Conference and Exposition, 2018
    Co-Authors: Rongyi Niu, Wu Chen, Liangcai Shu, Weiguo Zhang, Guangfu Ning
    Abstract:

    Classical full-bridge converters with Zero-voltage and Zero-Current-Switching (ZVZCS) mainly achieve the Zero-voltage-Switching (ZVS) in leading leg and the Zero-Current-Switching (ZCS) in lagging leg. However, when IGBTs are used in high-voltage high-power applications, the great turn-off loss of the leading leg cannot be ignored due to the Current tailing. Therefore, the conditions of ZCS for PWM full-bridge converters are analyzed in this paper. And a general strategy which embraces topology design and control method is presented to realize the ZCS for main switches. On this basis, a novel ZCS method with simple auxiliary circuit for PWM full-bridge converter is proposed and tested. This proposed method can realize the ZCS both for full-bridge converter switches and the auxiliary switch, thus high efficiency can be achieved. Specific operation principle and design procedure of this proposed ZCS method are presented. Finally, the theoretical analysis of proposed method is verified by a 600 V/2.5kW experimental prototype.

  • a hybrid resonant zcs pwm converter for renewable energy sources connecting to mvdc collection system
    IEEE Transactions on Industrial Electronics, 2018
    Co-Authors: Guangfu Ning, Wu Chen
    Abstract:

    To relieve the tail Current effect of insulated-gate bipolar transistors which are preferred in high-power applications, an approach of Zero-Current-Switching (ZCS) for main switches is presented in this paper. Different from the large turn- off Current of the main switches of the conventional Zero-voltage and Zero-Current-Switching (ZVZCS) full-bridge (FB) dc–dc converter, small turn- off Current of auxiliary circuit is introduced to achieve ZCS for main switches, where the auxiliary circuit also delivers a small portion power and can realize ZVZCS. Hence, high efficiency can be achieved with the Switching loss lowered remarkably. Furthermore, a hybrid resonant FB dc–dc converter is proposed, the operation principle and parameters design rules of which are analyzed in detail. A 200 V-2 kV/3 kW experimental platform has been built to verify the feasibility and performance of the proposed ZCS approach, as well as the proposed converter.

  • Analysis of Strategy for Achieving Zero-Current Switching in Full-Bridge Converters
    IEEE Transactions on Industrial Electronics, 2018
    Co-Authors: Liangcai Shu, Wu Chen, Guangfu Ning
    Abstract:

    Conventional Zero-voltage and Zero-Current-Switching (ZVZCS) full-bridge converters are widely used because they can realize Zero-voltage Switching (ZVS) for the leading leg and Zero-Current Switching (ZCS) for the lagging leg. However, the large turn-off loss of the leading leg is still unacceptable in high-voltage high-power applications where insulated-gate bipolar transistors (IGBTs) with Current tailing are employed. Hence, it is preferable to achieve ZCS for all IGBTs of full-bridge converters. This paper analyzes the ZCS conditions for pulsewidth modulated (PWM) full-bridge converters and proposes a general strategy for achieving ZCS for main switches, including the control strategy and design method of the topology. Based on this theory, a novel ZCS PWM full-bridge converter with simple auxiliary circuit is derived and tested. It can achieve ZCS not only for the main switches of full-bridge converter, but for the auxiliary switch as well, and obtain high efficiency. The operation principle of the proposed ZCS PWM full-bridge converter and the design procedure are presented. The experimental results of a 600 V/2.5 kW prototype are also included to verify the theoretical analysis.

  • a resonant zvzcs dc dc converter with two uneven transformers for an mvdc collection system of offshore wind farms
    IEEE Transactions on Industrial Electronics, 2017
    Co-Authors: Liangcai Shu, Wu Chen, Guangfu Ning, Wu Cao, Jun Mei, Jianfeng Zhao, Chun Liu
    Abstract:

    A resonant Zero-voltage and Zero-Current-Switching (ZVZCS) dc–dc converter is proposed in this paper for a medium-voltage dc collection system of offshore wind farms. The resonant converter is composed of two full-bridge cells sharing a bridge leg, two transformers with uneven power ratings and different functions, whose secondary windings are connected in series and a voltage-doubler rectifier. The converter operates in discontinuous Current mode and can achieve Zero-Current Switching for four main power switches and rectifier diodes over the whole load range. The two auxiliary switches with small forward Current can be turned on with ZVZCS, and turned off with Zero-voltage Switching. Hence, the Switching loss can be reduced and efficiency is improved. The operation principle of the converter is analyzed and design rules of main parameters are presented. The influences of the turn ratios of auxiliary transformer and resonant capacitance on the peak and Switching-off Currents are discussed in detail. Furthermore, a model is built in PLECS and simulation results are given. A 150–1500 V/2 kW prototype is established and tested to verify the operation principle and design rules.

  • A Hybrid ZVZCS Dual-Transformer-Based Full-Bridge Converter Operating in DCM for MVDC Grids
    IEEE Transactions on Power Electronics, 2017
    Co-Authors: Guangfu Ning, Wu Chen, Liangcai Shu, Xiaohui Qu
    Abstract:

    High-power dc-dc converter is the essential component for connecting the renewable energy sources to medium-voltage dc (MVDC) grids. In this paper, a novel Zero-voltage Zero-Current Switching converter with two full-bridge cells sharing a bridge leg and connecting the secondary windings of two transformers in series is proposed for MVDC applications. One big feature of the proposed converter is that the required inductance used for energy transmission is reduced remarkably and even can be embedded in the transformer in some cases. Special but simple control strategy adopted by the converter makes it work in discontinuous Current mode, which can realize Zero-Current Switching for the main switches and rectifier diodes in the whole load range. Meanwhile, the auxiliary switches with small Current rating can realize Zero-voltage Switching naturally. Hence, the Switching loss is reduced, which is very important for high-power applications. The effects of the turns ratio of auxiliary transformer on the total loss and needed inductance are comprehensively analyzed and proved. With a detailed parameters design procedure, a simulation model is established in the software PLECS and the operation principle of the converter is verified. A 120 V-1200 V/1 kW prototype was built to validate the operation principle of the proposed converter.

Bohyung Cho - One of the best experts on this subject based on the ideXlab platform.

  • novel Zero voltage and Zero Current Switching zvzcs full bridge pwm converter using coupled output inductor
    IEEE Transactions on Power Electronics, 2002
    Co-Authors: Hangseok Choi, Jungwon Kim, Bohyung Cho
    Abstract:

    A novel Zero-voltage and Zero-Current-Switching (ZVZCS) full-bridge pulse-width-modulated (PWM) converter is proposed to improve the previously proposed ZVZCS full-bridge PWM converters. By employing a simple auxiliary circuit with neither lossy components nor active switches, soft-Switching of the primary switches is achieved. The proposed converter has many advantages such as simple auxiliary circuit, high efficiency, low voltage stress of the rectifier diode and self-adjustment of the circulating Current, which make the proposed converter attractive for the high voltage and high power applications. The principles of operation and design considerations are presented and verified on the 4 kW experimental converter operating at 80 kHz.

  • novel Zero Current Switching zcs pwm switch cell minimizing additional conduction loss
    IEEE Transactions on Industrial Electronics, 2002
    Co-Authors: Hangseok Choi, Bohyung Cho
    Abstract:

    This paper proposes a new Zero-Current-Switching (ZCS) pulsewidth modulation (PWM) switch cell that has no additional conduction loss of the main switch. In this cell, the main switch and the auxiliary switch turn on and turn off under Zero-Current condition. The diodes commutate softly and the reverse-recovery problems are alleviated. The conduction loss and the Current stress of the main switch are minimized, since the resonating Current for the soft Switching does not flow through the main switch. Based on the proposed ZCS PWM switch cell, a new family of DC-to-DC PWM converters is derived. The new family of ZCS PWM converters is suitable for the high-power applications employing insulated gate bipolar transistors. Among the new family of DC-to-DC PWM converters, a boost converter was taken as an example and has been analyzed. Design guidelines with a design example are described and verified by experimental results from the 2.5 kW prototype boost converter operating at 40 kHz.

  • novel Zero Current Switching zcs pwm switch cell minimizing additional conduction loss
    Power Electronics Specialists Conference, 2001
    Co-Authors: Hangseok Choi, Bohyung Cho
    Abstract:

    This paper proposes a new Zero-Current Switching (ZCS) pulse width modulation (PWM) switch cell that has no additional conduction loss of the main switch. In this cell, the main switch and the auxiliary switch turn on and turn off under Zero Current condition. The diodes commutate softly and the reverse recovery problems are alleviated. The conduction loss and the Current stress of the main switch are minimized, since the resonating Current for the soft Switching does not flow through the main switch. Based on the proposed ZCS PWM switch cell, a new family of DC to DC PWM power converters is derived. The new family of ZCS PWM converters is suitable for the high power applications employing IGBTs. Among the new family of DC to DC PWM converters, a boost converter was taken as an example and has been analyzed. Design guidelines with a design example are described and verified by experimental results from the 2.5 kW prototype boost converter operating at 40 kHz.

  • novel Zero voltage and Zero Current Switching zvzcs full bridge pwm converter using coupled output inductor
    Applied Power Electronics Conference, 2001
    Co-Authors: Hangseok Choi, Jungwon Kim, Bohyung Cho
    Abstract:

    A novel Zero voltage and Zero Current Switching (ZVZCS) full bridge (FB) PWM converter is proposed. The new converter improves the drawbacks of the previously proposed ZVZCS FB PWM converters. A simple auxiliary circuit with neither lossy components nor active switches achieves ZVZCS of the primary switches. Since the proposed converter has many advantages such as simple auxiliary circuit, high efficiency, low voltage stress of the rectifier diode and self-adjustment of the circulating Current, it is very attractive for the high power applications. The principles of operation and design considerations are presented. The experimental verifications from 4 kW prototype converter operating at 80 kHz are presented.

Dan Chen - One of the best experts on this subject based on the ideXlab platform.

  • a family of Zero voltage transition bridgeless power factor correction circuits with a Zero Current Switching auxiliary switch
    IEEE Transactions on Industrial Electronics, 2011
    Co-Authors: Hsienyi Tsai, Tsunhsiao Hsia, Dan Chen
    Abstract:

    A novel Zero-voltage-transition high-efficiency bridgeless power-factor-correction (PFC) circuit with a Zero-Current-Switching auxiliary switch was proposed, analyzed, and experimentally verified. An assist circuit, consisting of a resonant inductor, two blocking diodes, a clamping circuit, an autotransformer, and an auxiliary MOSFET switch, was used to reduce the turn-on Switching loss of the two main switches of the bridgeless PFC circuit and the turn-off Switching loss of the auxiliary switch. The soft commutation of the main switches is achieved without imposing an additional voltage stress on the main switches. Feedback gate-drive signals can be obtained by using an existing converter IC controller modified to fit the purpose. In this paper, a detailed description of the circuit operation will be given. Based on the analysis, the guidelines for the component selection are presented. A prototype of 100-kHz 600-W universal-line PFC bridgeless circuit was built to verify the proposed scheme. In addition, based on the same concept, a family of bridgeless PFC configuration was proposed.

  • a family of Zero voltage transition bridgeless power factor correction circuits with a Zero Current Switching auxiliary switch
    IEEE Transactions on Industrial Electronics, 2011
    Co-Authors: Hsienyi Tsai, Tsunhsiao Hsia, Dan Chen
    Abstract:

    A novel Zero-voltage-transition high-efficiency bridgeless power-factor-correction (PFC) circuit with a Zero-Current-Switching auxiliary switch was proposed, analyzed, and experimentally verified. An assist circuit, consisting of a resonant inductor, two blocking diodes, a clamping circuit, an autotransformer, and an auxiliary MOSFET switch, was used to reduce the turn-on Switching loss of the two main switches of the bridgeless PFC circuit and the turn-off Switching loss of the auxiliary switch. The soft commutation of the main switches is achieved without imposing an additional voltage stress on the main switches. Feedback gate-drive signals can be obtained by using an existing converter IC controller modified to fit the purpose. In this paper, a detailed description of the circuit operation will be given. Based on the analysis, the guidelines for the component selection are presented. A prototype of 100-kHz 600-W universal-line PFC bridgeless circuit was built to verify the proposed scheme. In addition, based on the same concept, a family of bridgeless PFC configuration was proposed.

Sewan Choi - One of the best experts on this subject based on the ideXlab platform.

  • Zero Current Switching series loaded resonant converter insensitive to resonant component tolerance for battery charger
    Iet Power Electronics, 2014
    Co-Authors: Junsung Park, Sewan Choi
    Abstract:

    This study proposes an electric vehicle (EV) battery charger with a fixed frequency Zero-Current-Switching (ZCS) series loaded resonant converter (SRC). Owing to the proposed fixed frequency operation the SRC is capable of operating under ZCS turn on and turn off regardless of voltage variation or load variation, and the magnetic components and the electromagnetic interference (EMI) filters can be optimised. The proposed battery charger has minimum component count, which makes it possible to achieve low cost and high reliability. Also, it is insensitive to resonant component tolerances and therefore suitable for high volume manufacturing. Experimental results are provided from a 3.3 kW prototype which was built for 2011 Future Energy Challenge Competition.

  • a three phase Current fed push pull dc dc converter with active clamp for fuel cell applications
    IEEE Transactions on Power Electronics, 2011
    Co-Authors: Sang Won Lee, Junsung Park, Sewan Choi
    Abstract:

    In this paper, a new active-clamped three-phase Current-fed push-pull dc-dc converter is proposed for high-power applications where low-voltage high-Current input sources such as fuel cells are used. The proposed converter has the following features: active clamping of the transient surge voltage caused by transformer leakage inductances, natural Zero-voltage Switching turn-on of main switches using energy stored in transformer leakage inductor, small Current rating and Zero-voltage and Zero-Current Switching of clamp switches, no additional start-up circuitry for soft starting due to the operating duty cycle range between 0 and 1, and Zero-Current Switching turn-off of rectifier diodes leading to negligible voltage surge associated with the diode reverse recovery. A comparative study along with loss analysis is performed. Experimental results from 5-kW laboratory prototypes of the proposed active-clamped converter and the passive-clamped converter are provided.

  • a three phase Zero voltage and Zero Current Switching dc dc converter for fuel cell applications
    IEEE Transactions on Power Electronics, 2010
    Co-Authors: Hyung Joon Kim, Changwoo Yoon, Sewan Choi
    Abstract:

    In spite of having many advantages, such as low switch voltage and easy implementation, the voltage-fed dc-dc converter has been suffering from problems associated with large transformer leakage inductance due to high transformer turn ratio when it is applied to low-voltage, high-Current step-up application such as fuel cells. This paper proposes a new three-phase voltage-fed dc-dc converter, which is suitable for low-voltage, high-Current applications. The transformer turn ratio is reduced to half owing to ?-Y connection. The Zero-voltage and Zero-Current Switching (ZVZCS) for all switches are achieved over wide load range without affecting effective duty cycle. A clamp circuit not only clamps the surge voltage but also reduces the circulation Current flowing in the high-Current side, resulting in significantly reduced conduction losses. The duty cycle loss can also be compensated by operation of the clamp switch. Experimental waveforms from a 1.5 kW prototype are provided.