แบบจำลองไฟสลับสำหรับควบคุมอินเวอร์เตอร์แบบเรโซแนนซ์ผ่านแรงดันไฟตรงด้านเข้า

Abstract

An ac small-signal model of a high-frequency resonant inverter with dc bus voltage control, which is essential for the design of inverter output voltage and current controller, was derived in this paper. The inverter dc bus voltage control was implemented by a buck converter. Dynamic models of both the resonant inverter and the dc-dc converter were formulated. As the resonant frequency of the inverter’s load circuit is much higher than that of the converter circuit, the dynamic of the inverter circuit has negligible effect on the dynamic of the converter and thus can be neglected in the calculation of the converter model. Performance criteria of a small-signal step response of the model were compared with those obtained from envelopes of circuit simulation and experimental waveform. Good agreement between modeling and simulation was observed. The discrepancy between experimental results and those of the model is about 10%.