Ultrasonic power system based on high frequency transformer feedback

Abstract

The present invention discloses an ultrasonic power system based on high frequency transformer feedback, comprising an ultrasonic power, a matching inductor, an ultrasonic transducer, a non-inductive resistance, a high frequency pulse transformer, a phase discriminator and a DSP, wherein one output end of the ultrasonic power is connected with the matching inductor and the transducer in series in order and then is connected with one end of the non-inductive resistance and an end of a phase discrimination circuit resistance R1 respectively; the other end of the non-inductive resistance is connected with the other output end of the ultrasonic power; the output signal of the phase discrimination circuit is connected with the DSP; a primary terminal of the high frequency pulse transformer is connected with the output end of the ultrasonic power, one end of a secondary terminal of the high frequency pulse transformer is connected with one end of a phase discrimination circuit resistance R4 and the ground, and the other end of the secondary terminal of the high frequency pulse transformer is connected with the other end of the phase discrimination circuit resistance R4 and a 5th pin of an operation amplifier. The ultrasonic power system solves the problem of response delay in voltage phase measurement and reduces system error; and compared with a sensor, the high frequency transformer in the system has the advantages of small volume, light weight and low price.

Description

technical field [0001] The invention belongs to the field of ultrasonic generators, in particular to an ultrasonic power supply system. Background technique [0002] At present, in the sampling circuit of the ultrasonic power supply that uses the phase method for frequency tracking, all sensors are used, and then the obtained sampling signal is sent to the single-chip microcomputer or DSP through phase detection processing, and the frequency of the PWM wave output by the single-chip microcomputer or DSP is adjusted. Then change the frequency of the output voltage of the ultrasonic power supply, so as to achieve the purpose of frequency tracking. Due to the response delay of sensors and transformers when measuring voltage and current, the measurement is inaccurate. Therefore, when the resonance of the ultrasonic transducer is high, the tracking of the resonance frequency by the ultrasonic power supply cannot be fast and accurate. Contents of the invention [0003] In order...

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Problems solved by technology

[0003] In order to overcome the problem that the existing ultrasonic power supply has a response delay in the feedback link, which leads to the inaccurate measurement of the phase difference of the output voltage and current by the ultrasonic power supply, the invention discloses an ultrasonic power supply system based on high-frequency transformer feedback

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