High-Precision Control for Auxiliary Resonant Snubber Converter Considering Dead-Time Effect and On-Resistance of Switching Devices

On-resistance of switching device and dead-time effect are both the major contributors to nonlinear output error, which is the main problem of switching power amplifier in ultra-precision positioning application. Due to zero-current clamping and estimation error, these error sources are hardly to be completely compensated at same time. Therefore, a high-precision control strategy for auxiliary resonant snubber converter (ARSC) which is a zero-voltage switching power amplifier is proposed to solve the problems above. Moreover, the proposed strategy does not require precise parameters to estimate the error. In this article, the generation mechanism of the nonlinear output error in the ARSC is analyzed, and the error analytical model is established. In addition, the proposed strategy and its design method are introduced. Finally, the proposed strategy is verified on the experimental platform. The experimental results show that the quality of the output current is effectively improved with the proposed control strategy.