Power supply system used for ultrasonic welder

Abstract

The invention discloses a power supply system used for an ultrasonic welder. The power supply system comprises a main circuit and a control circuit, wherein the main circuit comprises a rectifying filter circuit, a power inverter circuit and a high-frequency transformer which are sequentially connected; the control circuit comprises a phase detecting circuit, a voltage feedback circuit, a current feedback circuit, a power supply control chip, a DDS frequency tracking circuit, a phase-shift pulse generating circuit and a drive circuit; the phase detecting circuit, the voltage feedback circuit, the current feedback circuit, the DDS frequency tracking circuit and the phase-shift pulse generating circuit are separately connected to the power supply control chip; and the phase-shift pulse generating circuit is connected to the power inverter circuit through the drive circuit. The power supply system has the beneficial effects that: a frequency resolution rate reaches 1Hz, and quick and accurate tracking of the resonant frequency of a transducer can be realized; the output voltage and the output current can be continuously adjustable, and the output amplitude of the transducer is stable; and fault diagnosis and protection functions for over-current, over-heating and the like are achieved.

Description

technical field [0001] The invention relates to the field of ultrasonic welding, in particular to a power supply system for an ultrasonic plastic welding machine. Background technique [0002] Ultrasonic plastic welding technology is a new type of processing technology. It does not need to add any adhesives, solvents or fillers. It has fast welding speed, high connection strength and simple operation, which is very suitable for the needs of modern mass production. Therefore, ultrasonic plastic welding technology has been more and more widely used. However, as a key part of ultrasonic welding, the power supply for ultrasonic welding still has the problems of poor frequency automatic tracking performance, output amplitude stability and continuous adjustability in current domestic products that cannot meet actual requirements. [0003] Chinese Patent Document No. CN202275295U disclosed an ultrasonic welding power supply system on June 13, 2012, and specifically disclosed that ...

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Problems solved by technology

[0004] The structure has the above defects, that is, the frequency automatic tracking performance is poor, the output amplitude stability and continuous adjustability are difficult to meet the actual requirements, therefore, it is necessary to make further improvements

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