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The Effect of Transformer Leakage Inductance on the Steady State Performance of Push-pull based Converter with Continuous Current

  • Chen, Qian (School of Electrical and Engineering, Beijing Jiaotong University) ;
  • Zheng, Trillion Q. (School of Electrical and Engineering, Beijing Jiaotong University) ;
  • Li, Yan (School of Electrical and Engineering, Beijing Jiaotong University) ;
  • Shao, Tiancong (School of Electrical and Engineering, Beijing Jiaotong University)
  • Received : 2012.11.07
  • Published : 2013.05.20

Abstract

As a result of the advantages such as high efficiency, continuous current and high stability margin, push-pull converter with continuous current (PPCWCC) is competitive for battery discharge regulator (BDR) which plays an important role in power conditioning unit (PCU). Leakage inductance yields current spike in low-ripple current of PPCWCCs. The operating modes are added due to leakage inductance. Therefore the steady state performance is affected, which is embodied in the spike of low-ripple current. PPCWCCs which are suitable for BDR can be separated into three types by current spike characteristics. Three representative topologies IIs1, IIcb2 and Is3 are analyzed in order to investigate the factors on the magnitude and duration of spike. Equivalent current sampling method (ECSM) which eliminates the sampling time delay and achieves excellent dynamic performance is adopted to prevent the spike disturbance on current sampling. However, ECSM reduces the sampling accuracy and telemetry accuracy due to neglecting the spike. In this paper, ECSM used in PPCWCCs is summarized. The current sampling error is analyzed in quality and quantity, which provides the foundation for offsetting and enhancing the telemetry accuracy. Finally, current sampling error rate of three topologies is compared by experiment results, which verify the theoretical analysis.

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