A method and device for fast tracking of ultrasonic resonance frequency

Abstract

The invention discloses a fast tracking method and device for ultrasonic resonance frequency, comprising: real-time detection of the inductance voltage in the matching circuit and the output voltage output to the load of the transducer, and performing linear calculation on the detected inductance voltage and the output voltage; And generate a frequency adjustment amount according to the linear operation result and the initial operating frequency, and use the frequency adjustment amount to control the output frequency of the ultrasonic power converter to track and adjust the initial operating frequency. The invention performs closed-loop control on the frequency of the ultrasonic system by detecting the inductance voltage and the output voltage, and realizes fast tracking and adjustment of the resonance frequency point of the system through the voltage calculation results. The required hardware circuit is simple, the software algorithm is simple and efficient, and can quickly respond to the frequency of the load. Change and real-time tracking of the resonance frequency of the ultrasonic power system for adjustment.

Description

technical field [0001] The invention relates to the technical field of ultrasonic power supply systems, in particular to a fast tracking method and device for ultrasonic resonance frequency. Background technique [0002] Ultrasonic power supply is widely used in ultrasonic cleaning, welding processing, cutting and other fields. The existing ultrasonic system is mainly composed of ultrasonic power supply, transducer, horn, welding head and so on. The function of the ultrasonic power supply is to convert electrical energy into a high-frequency AC signal that matches the ultrasonic transducer, and the transducer is a device that converts the electrical energy of the ultrasonic frequency into mechanical vibration. During the working process of the ultrasonic system, due to the temperature of the ultrasonic transducer and other piezoelectric devices, the size of the weldment, the wear of the welding head, and the sudden increase and decrease of the load The work changes, and th...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem in the prior art that the ultrasonic resonance frequency cannot be accurately tracked and adjusted, and to provide a fast tracking method and device for the ultrasonic resonance frequency. This method analyzes the relationship between the ultrasonic power supply and the transducer load. Based on the characteristic relationship between them, a method of detecting the inductor voltage and the output voltage for closed-loop control is proposed to realize fast tracking and adjustment of the resonance frequency point of the system, which can quickly respond to the frequency change of the load and real-time track the resonance frequency of the ultrasonic power supply system for adjustment.

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