基于压电变压器的电源谐振电流估计与锁相环反馈设计

A control system to achieve zero-voltage switching (ZVS) for an inductorless half-bridge piezoelectric transformer-based resonant power supply is presented. Both the phase and frequency of the resonant current are locked to the switching waveform using an analog phase-locked loop (PLL) to ensure ZVS operation. We present two resonant current estimation circuits, which generate the reference signal...