The Experts below are selected from a list of 18450 Experts worldwide ranked by ideXlab platform
Hyunlark Do - One of the best experts on this subject based on the ideXlab platform.
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Zero Voltage Switching synchronous buck converter with a coupled inductor
IEEE Transactions on Industrial Electronics, 2011Co-Authors: Hyunlark DoAbstract:A Zero-Voltage-Switching (ZVS) synchronous buck converter with a coupled inductor is proposed. An auxiliary circuit which is incorporated in the conventional synchronous buck converter allows power switches to operate with ZVS. Moreover, the reverse recovery problem associated with the body diode of the synchronous switch is solved. The operating principle and a steady-state analysis of the proposed ZVS synchronous buck converter are presented. Experimental results based on a 115-W prototype are provided to verify the effectiveness and feasibility of the proposed converter.
Rongrong Zhang - One of the best experts on this subject based on the ideXlab platform.
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a novel Zero Voltage Switching pwm full bridge converter
IEEE Transactions on Power Electronics, 2008Co-Authors: Wu Chen, Xinbo Ruan, Rongrong ZhangAbstract:Introducing resonant inductance and clamping diodes into the full-bridge converter can eliminate the Voltage oscillation across the rectifier diodes and increase the load range for Zero-Voltage-Switching (ZVS) achievement. The resonant inductance is shorted and its current keeps constant when the clamping diode is conducting, and the clamping diode is hard turned-off, causing significant reverse recovery loss if the output filter inductance is relatively larger. This paper improves the full-bridge converter by introducing a reset winding in series with the resonant inductance to make the clamping diode current decay rapidly when it conducts. The reset winding not only reduces the conduction losses, but also makes the clamping diodes naturally turn-off and avoids the reverse recovery. The operation principle of the proposed converter is analyzed. The design of the turns ratio of transformer is discussed. A 1 kW prototype converter is built to verify the operation principle and the experimental results are also demonstrated.
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a novel Zero Voltage Switching pwm full bridge converter
Power Electronics Specialists Conference, 2007Co-Authors: Wu Chen, Xinbo Ruan, Rongrong ZhangAbstract:Introducing resonant inductance and clamping diodes into the full-bridge converter can eliminate the Voltage oscillation across the rectifier diodes and increase the load range for Zero- Voltage-Switching (ZVS) achievement. The resonant inductance is shorted and its current keeps constant when the clamping diode is conducting, and the clamping diodes are hard turned-off and cause significant reverse recovery loss if the output filter inductance is relatively larger. This paper improves the full-bridge converter by introducing a reset winding in series with the resonant inductance to make the clamping diode current decay rapidly when it conducts. The reset winding not only reduces the conduction losses, but also makes the clamping diodes naturally turn-off and avoids the reverse recovery. The operation principle of the proposed converter is analyzed. The design of the turns ratio of transformer is discussed. A 1kW prototype converter is built to verify the operation principle and the experimental results are also demonstrated.
Xinbo Ruan - One of the best experts on this subject based on the ideXlab platform.
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a novel Zero Voltage Switching pwm full bridge converter
IEEE Transactions on Power Electronics, 2008Co-Authors: Wu Chen, Xinbo Ruan, Rongrong ZhangAbstract:Introducing resonant inductance and clamping diodes into the full-bridge converter can eliminate the Voltage oscillation across the rectifier diodes and increase the load range for Zero-Voltage-Switching (ZVS) achievement. The resonant inductance is shorted and its current keeps constant when the clamping diode is conducting, and the clamping diode is hard turned-off, causing significant reverse recovery loss if the output filter inductance is relatively larger. This paper improves the full-bridge converter by introducing a reset winding in series with the resonant inductance to make the clamping diode current decay rapidly when it conducts. The reset winding not only reduces the conduction losses, but also makes the clamping diodes naturally turn-off and avoids the reverse recovery. The operation principle of the proposed converter is analyzed. The design of the turns ratio of transformer is discussed. A 1 kW prototype converter is built to verify the operation principle and the experimental results are also demonstrated.
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a novel Zero Voltage Switching pwm full bridge converter
Power Electronics Specialists Conference, 2007Co-Authors: Wu Chen, Xinbo Ruan, Rongrong ZhangAbstract:Introducing resonant inductance and clamping diodes into the full-bridge converter can eliminate the Voltage oscillation across the rectifier diodes and increase the load range for Zero- Voltage-Switching (ZVS) achievement. The resonant inductance is shorted and its current keeps constant when the clamping diode is conducting, and the clamping diodes are hard turned-off and cause significant reverse recovery loss if the output filter inductance is relatively larger. This paper improves the full-bridge converter by introducing a reset winding in series with the resonant inductance to make the clamping diode current decay rapidly when it conducts. The reset winding not only reduces the conduction losses, but also makes the clamping diodes naturally turn-off and avoids the reverse recovery. The operation principle of the proposed converter is analyzed. The design of the turns ratio of transformer is discussed. A 1kW prototype converter is built to verify the operation principle and the experimental results are also demonstrated.
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Zero Voltage Switching multiresonant three level converters
IEEE Transactions on Industrial Electronics, 2007Co-Authors: Ke Jin, Xinbo RuanAbstract:This paper proposes a family of Zero-Voltage-Switching multiresonant three-level converters (ZVS-MR-TLCs), which are derived by adding a ZVS-MR multiresonant network to the TLCs. The arrangement of a multiresonant network results in the absorption of all the major parasitic components in the resonant circuit, including the switch output capacitor, diode junction capacitor, and transformer leakage inductor. Compared with the two-level multiresonant converters (MRCs), the proposed converters achieve ZVS in a wider load range and reduce the Voltage stress on the switches and diodes, and the filter can be reduced significantly. The Buck ZVS-MR-TLC is taken as the example to illustrate the operation principle, characteristics, and advantages over the two-level Buck ZVS-MRC. An interleaved control strategy and a Voltage control of the flying capacitor for the new converters are presented in detail. A 1-kW high-Voltage-input railway charger prototype converter is built in our lab to verify the theoretical analysis and the effectiveness of the interleaved control strategy and flying capacitor Voltage control method
Xiaoming Yuan - One of the best experts on this subject based on the ideXlab platform.
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Zero-Voltage Switching for the neutral-point-clamped (NPC) inverter
IEEE Transactions on Industrial Electronics, 2002Co-Authors: Xiaoming Yuan, Ivo BarbiAbstract:This paper proposes a transformer-assisted pulsewidth-modulation Zero-Voltage-Switching neutral-point-clamped (NPC) inverter. With the assistance of a transformer-assisted small-rating lossless auxiliary circuit, the main switches work with Zero-Voltage Switching without suffering from any Voltage/current spikes, under simple explicit control. The technique allows for higher operating frequency and better device utilization of the NPC inverter. Operation, analysis, design, as well as testing results from a 7-kW prototype are presented in detail.
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analysis designing and experimentation of a transformer assisted pwm Zero Voltage Switching pole inverter
IEEE Transactions on Power Electronics, 2000Co-Authors: Xiaoming Yuan, Ivo BarbiAbstract:This paper proposes a transformer-assisted pulsewidth modulation (PWM) Zero-Voltage Switching pole inverter. As the auxiliary-resonant-commutated pole inverter (ARCPI), the proposal guarantees Zero-Voltage Switching of the main switch and Zero-current Switching of the auxiliary switch, with a small power auxiliary circuit and full PWM capability. In particular, problems outstanding with the ARCPI such as control complexity, auxiliary switch protection, and center-tap potential variation, etc., are solved in the proposal. The commutation process is discussed step by step in the paper. A detailed analysis for the auxiliary circuit with regard to commutation duration/duty-cycle limitation, auxiliary switch peak current/RMS current, resonant capacitor RMS current, as well as pole output Voltage loss are presented afterwards. A design methodology for the auxiliary circuit is recommended based on the analysis. The proposal is experimentally verified with a 4.25 kW half-bridge inverter prototype.
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Control simplification and stress reduction in a modified PWM Zero Voltage Switching pole inverter
APEC '99. Fourteenth Annual Applied Power Electronics Conference and Exposition. 1999 Conference Proceedings (Cat. No.99CH36285), 1999Co-Authors: Xiaoming Yuan, I. BarbiAbstract:This paper discusses a modified PWM Zero Voltage Switching pole inverter which allows for Zero Voltage Switching of the main switch and Zero current Switching of the auxiliary switch. The proposal features simplified control and reduced auxiliary circuit stress in comparison with the auxiliary-resonant-commutated-pole-inverter (ARCPI). Operation and design aspects of the proposal are detailed in the paper. The proposal is verified by a 4.5 kW IGBT half bridge prototype.
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A transformer assisted Zero Voltage Switching scheme for the neutral-point-clamped (NPC) inverter
APEC '99. Fourteenth Annual Applied Power Electronics Conference and Exposition. 1999 Conference Proceedings (Cat. No.99CH36285), 1999Co-Authors: Xiaoming Yuan, Ivo BarbiAbstract:This paper proposes a transformer assisted PWM Zero Voltage Switching neutral-point-clamped (NPC) inverter. With the assistance of a transformer assisted small rating lossless auxiliary circuit, the main switches work with Zero Voltage Switching without suffering from any Voltage/current spikes, under simple explicit control. The technique allows for higher operating frequency and better device utilization of the NPC inverter. Operation, analysis, designing as well as testing results from a 7 kW prototype are presented in detail.
Bor-ren Lin - One of the best experts on this subject based on the ideXlab platform.
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Zero Voltage Switching double-ended converter
IET Power Electronics, 2010Co-Authors: Bor-ren Lin, J.-j. Chen, S.-f. ShenAbstract:A new Zero Voltage Switching (ZVS) converter with a double-ended rectifier is presented to reduce Switching losses on power semiconductors, decrease Voltage stresses on rectifier diodes and achieve bidirectional power delivery to output load. A buck-boost type of active snubber is connected in parallel with the primary side of a transformer to recycle the energy stored in transformer leakage and magnetising inductors and to limit Voltage stress on the main switch. During the transition interval, the transformer leakage inductor and the output capacitor of power MOSFET are resonant to realise the ZVS turn-on of the switch. Finally, the experimental results were given to demonstrate the circuit performance and to verify the feasibility of the proposed converter.
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Zero Voltage Switching double ended Cuk converter
2009 4th IEEE Conference on Industrial Electronics and Applications, 2009Co-Authors: Bor-ren Lin, Y.-s. Huang, J.-j. Chen, J.-j. ShiehAbstract:This paper presents a Zero Voltage Switching (ZVS) Cuk converter with double ended rectifier to reduce Switching losses on power semiconductors, decrease Voltage stresses on rectifier diodes and achieve power delivery to output load in positive and negative half cycle of the secondary winding Voltage. An auxiliary switch and a clamp capacitor are connected in parallel with the primary side of the transformer to absorb all the energy stored in the transformer leakage inductance. The resonant inductance and the clamp capacitance are resonant to achieve Zero-Voltage Switching (ZVS) of auxiliary switch. On the other hand, the resonant inductance and output capacitance of main switch are resonant to achieve ZVS turn-on of main switch. Experimental results for a 300W prototype circuit operating at 73kHz are given to demonstrate the effectiveness of the proposed converter.
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Interleaved Zero Voltage Switching forward converter with less switches
Electronics Letters, 2008Co-Authors: Bor-ren LinAbstract:An interleaved Zero Voltage Switching (ZVS) forward converter with less switches is presented. Two forward converters with active clamp technique are adopted in the circuit to achieve interleaved pulse-width-modulation (PWM) operation and load current sharing. Only two switches are used in the converter instead of four as in the conventional parallel ZVS converter. Experiments verified the theoretical analysis and the effectiveness of the converter.
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Analysis of a Zero Voltage Switching Cuk Converter
IECON 2007 - 33rd Annual Conference of the IEEE Industrial Electronics Society, 2007Co-Authors: Bor-ren Lin, Chien-lan Huang, Jin-fa WanAbstract:A boost type Zero Voltage Switching (ZVS) isolated Cuk converter is presented in this paper to reduce the Switching losses of main switch. An auxiliary switch and a clamp capacitor are connected in parallel with the main switch to absorb all the energy stored in the leakage inductance of the transformer. The ZVS operation of main switch is achieved by the resonance with the resonant inductor and output capacitor of main switch. The ZVS operation of auxiliary switch is achieved by the resonance with the resonant inductor and the clamp capacitor. Therefore both switches are turned on at ZVS. The principle of operation, system analysis and design consideration are presented Finally, experiments based on an 180 W (12 V/15 A) prototype are provided to demonstrate the effectiveness of the proposed converter.
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Analysis and implementation of a Zero-Voltage Switching forward converter with a synchronous rectifier
IEE Proceedings - Electric Power Applications, 2005Co-Authors: Bor-ren Lin, C.e. Huang, D. WangAbstract:The system analysis, circuit design and implementation of an active-clamp forward converter with a synchronous rectifier is presented. Different to a conventional forward converter, there is an auxiliary switch in the active-clamp forward converter. The clamp circuit is used to reset the energy stored in the leakage inductor in order to minimise the spike Voltage at the transformer's primary side. Thus, the Voltage stress on the main switch can be reduced. A resonant circuit based on the output capacitor and leakage inductor of the transformer is able to achieve a Zero-Voltage Switching turn-on for both the main and auxiliary switches which will increase the circuit efficiency. A synchronous rectifier is used at the transformer's secondary side to further reduce the conduction losses. The operational principles of the active-clamp forward converter are analysed in detail and the circuit performance is compared with that of a conventional forward converter. The design procedure and an example of an active-clamp forward converter are presented. Finally experimental results are presented for a converter with an AC input Voltage of 90∼130 Vrms, an output Voltage of 5 V/20 A operating at a Switching frequency of 150 kHz which verify the Zero-Voltage Switching at turn-on.
