Automatic frequency tracking ultrasonic welding power supply device and control method

Abstract

The invention discloses an automatic frequency tracking ultrasonic welding power supply device and a control method. The automatic frequency tracking ultrasonic welding power supply device comprises an input module, a full-bridge DC-AC module, a matching module, an regulating module and a frequency control tracking module. The input module converts an alternating current into a direct current voltage, and the full-bridge DC-AC module converts the direct current voltage into a bidirectional square wave voltage signal. The matching module converts the bidirectional square wave voltage signal into an ultrasonic wave of a sinusoidal wave voltage signal to drive a transducer component to work. The regulating module controls the duty ratio of the full-bridge DC-AC module to adjust the output power. The frequency control tracking module performs shaping on a current phase and a voltage phase of the sinusoidal wave voltage signal and calculates phase positions of a plurality of timing sequencepoints, and outputs a corresponding regulating signal to control the regulating module to change the switching frequency to adjust the output frequency and perform automatic frequency tracking according to the leading or lagging state of the current phase and the phase positions of the multiple timing sequence points. The accuracy of frequency tracking is improved.

Description

technical field [0001] The invention relates to the technical field of power supplies, in particular to an automatic frequency tracking ultrasonic welding power supply device and a control method thereof. Background technique [0002] In the existing automatic frequency tracking ultrasonic welding machine power supply, common frequency tracking methods include: [0003] 1. Self-excited type, the representative circuit is a Taiwan line; it uses the voltage at both ends of the transducer to select frequency and phase-shift self-excited drive switch tube; it has the advantages of fast frequency tracking, wide tracking range, simple circuit, low cost, and load adaptability Strong and other advantages. However, when the load changes rapidly or the power is switched on and off, the upper and lower positive and negative half bridge arms in the circuit tend to have inconsistent turn-on times, which will cause the transformer / inductor to saturate and burn the switch tube. Moreover,...

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Problems solved by technology

[0007] In view of the shortcomings of the prior art above, the purpose of the present invention is to provide an automatic frequency tracking ultrasonic welding power supply device and its control method, aiming to solve the problem that the frequency tracking accuracy of the existing automatic frequency tracking ultrasonic welding machine power supply is not high

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