Matching device and matching method for ultrasonic power supply

Abstract

The invention discloses a matching device and matching method for an ultrasonic power supply. The matching device for the ultrasonic power supply comprises an ultrasonic signal generator, a drive isolation circuit, an ultrasonic power amplification circuit, a matching transformer, a tuning inductor, an ultrasonic transducer, a voltage sampling circuit, a current sampling circuit, a filtering and shaping circuit, a phase discriminator, an A / D converter, a single-chip microcomputer and a stepping motor. The output end of the matching transformer is connected with the tuning inductor; the output end of the tuning inductor is connected with the ultrasonic transducer; the voltage sampling circuit is used for collecting real-time working voltage signals at the two ends of a unit formed by the tuning inductor and the ultrasonic transducer, and transmitting the real-time working voltage signals to the phase discriminator. According to the matching device and matching method for the ultrasonic power supply, static impedance matching and dynamic impedance matching can be achieved, the matching inductance value can be tracked and adjusted through the phase difference of working currents and working voltages of the ultrasonic transducer, it can be ensured that the ultrasonic transducer always works at a resonance point, the maximum useful power output of the ultrasonic transducer can be achieved, in addition, the adjusting response speed is high, and accuracy is high.

Description

technical field [0001] The invention relates to a matching device for an ultrasonic power supply and a matching method thereof, belonging to the technical field of power ultrasonic systems. Background technique [0002] At present, due to factors such as heat generation, aging, and load changes, the resonant frequency of the transducer will deviate from the natural frequency, so that the output power of the power amplifier cannot be fully sent to the transducer, the signal will be distorted, and even circuit components will be damaged. damage. The traditional static matching has problems such as the inability to maintain the resonance of the series branch at any time and the low efficiency of manually adjusting the frequency. [0003] Since the matching circuit is an important part used to solve the above problems in the application of many power ultrasonic systems, the matching between the power ultrasonic systems and their driving power includes two aspects: one is impeda...

AI Technical Summary

Problems solved by technology

At present, the matching methods for tuning and filtering mainly include static matching and dynamic matching. Static matching is the matching between the output impedance of the driving power supply and the input impedance of the power ultrasonic system under the condition that the output frequency of the driving power supply is the same as the static resonant frequency of the power ultrasonic system. , it is suitable for applications requiring a fixed working frequency of the power ultrasonic system, but after the power ultrasonic system has been working for a long time, it may cause changes in its input impedance and resonance frequency due to changes in conditions such as temperature rise, which will cause static matching effects It will become worse, resulting in poor tuning and filtering matching effect; dynamic matching generally uses frequency tracking technology to track the change of system resonant frequency in real time to ensure circuit matching and improve system efficiency, but the output frequency is not fixed, which can overcome the static matching due to temperature However, the current dynamic matching technology has the following disadvantages: in the prior art of dynamic matching, the sampling of voltage and current signals in the ultrasonic power supply mainly uses current transformers to connect the passband filter in turn through wires circuit, comparison shaping circuit; the optocoupler voltage sampling circuit is sequentially connected to the band-pass filter circuit and comparison shaping circuit through wires. will have a certain impact on its reliability and safety

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