The 13th International Symposium on Linear Drives for Industry Application (LDIA2021)

61 / 2021-06-18 14:22:10

A Class of Control Strategies Based on Bias Current Decouple for High Precision Current Converter

zero-crossing distortion，current decouple，current characteristics，THD

In order to avoid zero-crossing distortion caused by blanking time, dual buck converter has received more and more attention. The continuous conduction mode (CCM) of inductor current can be maintained by injecting bias current, which can eliminate zero-crossing distortion. The existing current decoupling control strategy of dual buck full bridge converter (DBFBC) is realized by independent control of four main switches and the driver signals are independent and have no phase constraints. The proposed strategies are presented with only two sets of driver signals to achieve low harmonic distortion, and it can reduce the complexity of the system and potentially contribute to topology design. Moreover, the current characteristics of filter capacitor is considered, which can provide mechanism analysis for the design of filter circuit. The experimental results are presented and high precision of output current is achieved.