Abstract

Phase-shift control strategy is adopted extensively in wireless charging system (WCS) to regulate inverter output voltage, and namely, adjusting system output power under various load conditions. However, when it comes to light load or even no-load, the lower the output power is, the larger phase angle should be — which could cause inverter output voltage waveform to be abnormal. So, how to satisfy system power conversion caused by a wide load range variation is an issue of significance faced by WCS. To solve this problem, an optimal control strategy for power conversion based on PWM rectifier is proposed in this paper. Firstly, the condition resulting in ZVS is derived according to steady-state analysis with phase shifting in time domain. Moreover, a comparison of current-enhanced phase-shifted full-bridge(PS FB) converter and PWM rectifier is investigated to realize the ZVS condition via increasing turn-off current and decreasing input voltage of inverter respectively. And then, the novel voltage regulation-phase shifting(VR-PS) control strategy is proposed to regulate the system output power. Finally, the proposed VR-PS control strategy based on PWM rectifier is validated by simulation to reach the conclusions — spike interference was eliminated when system operated at light load, and meanwhile the system nominal efficiency has been improved when compared to current-enhanced PS FB converter.

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