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The voltage signal and current signal of Ultrasonic welding machine welder generator power supply are transformed into square waves through the waveform conversion circuit and then transmitted to the signal generation circuit. The signal generation circuit changes the output signal frequency according to the phase difference of the voltage signal and current signal at the output end of the impedance matching transformer. The frequency tracking range of the invention is wide, the load adaptability is strong, and it is not easily affected by temperature and pressure changes; Environmental protection, energy conservation, cost saving, suitable for small and medium-sized enterprises, with strong universality