Frequency sweep and frequency following control method for frequency of ultrasonic welding power source
A technology of ultrasonic welding and power frequency, applied in the direction of output power conversion devices, electrical components, high-efficiency power electronics conversion, etc., can solve the problems of reducing work efficiency and exacerbating the loss of transducers, and achieves simple circuits, high speed and low cost. easy effect
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[0018] A frequency sweeping frequency tracking control method for an ultrasonic welding power supply frequency, comprising the following steps:
[0019] Step 1: After turning on the ultrasonic generator, the MCU controller controls the inverter to output a certain initial operating frequency through the drive controller;
[0020] Step 2: Detect the working current in the ultrasonic system; the frequency sweeping mode is that the MCU controller controls the inverter output frequency to be f 0 +Δf;
[0021] Step 3: Detect the working current in the ultrasonic system, if the working current in the ultrasonic system increases, it means f 0 is not the resonance frequency of the ultrasonic system, continue to increase the output frequency f of the inverter according to a certain step size 0 +Δf; if the operating current in the ultrasonic system decreases when the output frequency of the transducer is increased, the output frequency of the control inverter becomes f 0 -Δf, if the ...
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