Patent ID: 8299747
Filing Date: 2012-10-30
Classification: H02M,H02N,Y02B

Abstract:
1. A single-stage zero-current switching driving circuit for ultrasonic motor, comprising: a buck-boost converter, receiving an input voltage, wherein the buck-boost converter comprises a first diode, a first inductor, a first capacitor and an active switch, the buck-boost converter operates in a discontinuous-conduction mode (DCM), before the trigger pulse cycle of a trigger signal of the active switch, the current of the first inductor decreases to zero; and a zero-current switching resonant inverter, connected to the buck-boost converter, wherein the resonant inverter comprises a second inductor, two blocking diodes, a second diode, a second capacitor and a resonant circuit, the two blocking diodes are used to block the interaction of power between the buck-boost converter and the resonant inverter, the resonant inverter generates a high frequency AC voltage so as to drive the ultrasonic motor.