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DING Zihua,LIAO Yong,LU Yifu,LIN Hao.Research on Improved Control Strategy for Single-phase Single-stage On-board Charger System with Asymmetrical Half-bridge Circuit[J].JOURNAL OF POWER SUPPLY,2018,16(6):109-116,151
Research on Improved Control Strategy for Single-phase Single-stage On-board Charger System with Asymmetrical Half-bridge Circuit
Received:September 22, 2016  Revised:March 09, 2018
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DOI:10.13234/j.issn.2095-2805.2018.6.109
Keywords:single-phase single-stage  secondary ripple power  asymmetrical half-bridge circuit  on-board charger system  offset compensation  first ripple  parameter design
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DING Zihua State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing , China
LIAO Yong State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing , China
LU Yifu The University of Sydney, Sydney 2006, Australia
LIN Hao State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing , China
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Abstract:
      A symmetrical half-bridge circuit can effectively absorb secondary ripple of a single-phase converter system on the DC side, reduce the system volume, and improve power density; however, it will induce first ripple on the DC side when the capacitances of upper and lower bridge arms are unequal. To solve this problem, a single-phase single-stage on-board charger system with an asymmetrical half-bridge circuit is studied in this paper, and an improved control strategy of inductor current and capacitor offset compensation is also proposed. Based on this strategy, the parameter design method for the inductor and capacitor of the half-bridge circuit is studied by satisfying three aspects, i.e., compensation for secondary ripple power, lowest voltage of battery, and avoiding over-modulation. Finally, simulation and experimental results verified that under the improved control strategy, the asymmetrical half-bridge circuit can not only filter secondary ripple effectively, but also avoid inducing first ripple, thus reducing the battery's terminal voltage and current ripples; in addition, simulations verified the effectiveness of the parameter design method.
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