28KHZ/40KHZ 60W Ultrasonic Cleaner Transducer Generator Electronic Circuit Board

The PCB circuit of the low frequency ultrasonic circuit board includes: a single phase pulse width modulation rectifier is adopted on the rectifying side to realize power factor correction and boost, replacing the traditional single phase uncontrolled rectification; On the DC side, the staggered parallel buck circuit is used for power regulation and parallel current sharing; On the inverter side, the phase shift control strategy is adopted to maximize power transmission to the transducer through the adjustment and control of the phase shift angle; In terms of frequency tracking, the control method of traditional frequency tracking is introduced, and an optimal working point identification and variable step frequency tracking method are adopted to solve the problems of large deviation and long transition time in traditional frequency tracking; The characteristics of static and dynamic matching networks are analyzed on the impedance matching network, and the series matching mode of static network is adopted.