Driver Power Design of Piezoelectric Vibrator Based on Single Phase Bridge Monopole SPWM Technology

The stability, carrying load ability and output bandwidth of the driving power have an important impact on the dynamic performance of the piezoelectric vibrator. Based on the unipolar SPWM control mode, a single-phase bridge switching power supply is proposed. The system is composed of a power drive circuit and digital control circuit. To achieve precise and controllable voltage output, the key setting strategy, frequency control strategy, voltage control strategy, and unipolar SPWM drive strategy are designed. The test results show that the measurement and LCD modules can accurately display the main parameters of the power supply. The analog output of the voltage waveform and the current waveform of the DAC module can truly reflect the actual state. It has the advantage of simplicity and convenience, and avoids the trouble of needing a special probe when measuring the actual voltage waveform.