Three phase interleaved high step up
www.ietdl.org
Published in IET Power Electronics
Received on 30th September 2013
Revised on 17th December 2013
Accepted on 18th January 2014 doi: 10.1049/iet-pel.2013.0751
ISSN 1755-4535
Three-phase interleaved high-step-up converter with coupled-inductor-based voltage quadrupler
Yihua Hu, Weidong Xiao, Wuhua Li, Xiangning He
College of Electrical Engineering, Zhejiang University, Hangzhou 310027, People’s Republic of China
E-mail: woohualee@zju.edu.cn
Abstract: This paper proposes a high-efficient DC–DC solution with the features of galvanic isolation, high-voltage gain, zero voltage switching operation, low input current ripple and high-power density. The converter is implemented by a three-phase coupled inductor bridge to remove the bulky input electrolytic capacitors. The introduced active clamp circuit recycles the energy stored in the leakage inductance and absorbs the voltage spikes on the main switch voltage. The series configuration with a voltage doubler at the second side contributes to a high-voltage gain and reduces the voltage stress across the rectifier devices. The output diode reverse-recovery problem is naturally mitigated by the leakage inductance of the coupled inductors.
Moreover, the active control with a neutral-point potential balance and a phase-deficient operation of the proposed converter are also studied. A converter prototype is designed and evaluated to verify the theoretical analysis and demonstrate a superior performance over the prior studies.
1
Introduction
Distributed generation requires high-step-up DC–DC converters to accommodate the low-voltage nature of batteries, fuel cells and photovoltaic cells [1, 2]. For the non-isolated applications, various topologies have been proposed for a high-step-up voltage operation by using a coupled inductor or a switched capacitor, which are reported and summarised in [3–15]. When the feature of galvanic isolation is required for the high-voltage gain
Published in IET Power Electronics
Received on 30th September 2013
Revised on 17th December 2013
Accepted on 18th January 2014 doi: 10.1049/iet-pel.2013.0751
ISSN 1755-4535
Three-phase interleaved high-step-up converter with coupled-inductor-based voltage quadrupler
Yihua Hu, Weidong Xiao, Wuhua Li, Xiangning He
College of Electrical Engineering, Zhejiang University, Hangzhou 310027, People’s Republic of China
E-mail: woohualee@zju.edu.cn
Abstract: This paper proposes a high-efficient DC–DC solution with the features of galvanic isolation, high-voltage gain, zero voltage switching operation, low input current ripple and high-power density. The converter is implemented by a three-phase coupled inductor bridge to remove the bulky input electrolytic capacitors. The introduced active clamp circuit recycles the energy stored in the leakage inductance and absorbs the voltage spikes on the main switch voltage. The series configuration with a voltage doubler at the second side contributes to a high-voltage gain and reduces the voltage stress across the rectifier devices. The output diode reverse-recovery problem is naturally mitigated by the leakage inductance of the coupled inductors.
Moreover, the active control with a neutral-point potential balance and a phase-deficient operation of the proposed converter are also studied. A converter prototype is designed and evaluated to verify the theoretical analysis and demonstrate a superior performance over the prior studies.
1
Introduction
Distributed generation requires high-step-up DC–DC converters to accommodate the low-voltage nature of batteries, fuel cells and photovoltaic cells [1, 2]. For the non-isolated applications, various topologies have been proposed for a high-step-up voltage operation by using a coupled inductor or a switched capacitor, which are reported and summarised in [3–15]. When the feature of galvanic isolation is required for the high-voltage gain