The full bridge switch Ultrasonic welding power generator, aiming at the capacitive reactance of the ultrasonic transducer when it works in the resonant state, compares the static matching and dynamic matching methods, achieves efficient dynamic matching by online detecting its static capacitance and adjusting its digital inductance, and designs a high-frequency pulse transformer to achieve impedance matching between the load end and the power end; In response to the resonance frequency change caused by temperature changes and other reasons in the transducer, a DSP digital phase-locked loop frequency tracking method is adopted to adjust the working frequency of the inverter to achieve frequency tracking;

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