The Effect of Transformer Leakage Inductance on
the Steady State Performance of Push-pull based Converter with Continuous Current
Qian Chen†, Trillion Q. Zheng*, Yan Li*, and Tiancong Shao*
†*School of Electrical and Engineering, Beijing Jiaotong University, Beijing, China
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.
LINK
http://jpe.or.kr/archives/view_articles.asp?seq=735
