Digital ultrasonic generator and automatic frequency locking method thereof

Abstract

The invention discloses a digital ultrasonic generator for measuring current wave forms and voltage wave forms at two ends of a transducer load in an isolation manner, acquiring current signals and voltage signals under effective power and automatically tracking frequencies through the signals to accurately find out resonant frequencies. The voltage wave forms and the current wave forms are calculated by multiplication; phase differences delta phi of the voltage and current wave forms are directly reflected through the obtained direct-current wave forms; and when delta phi is lower, a transducer is nearer a pure resistor, the conversion frequency of the transducer is higher, and the oscillation frequency thereof is nearer an optimal resonant point, so that the transducer load works in a resonant state, the conversion frequency of the ultrasonic transducer is improved, the heating capacity of an inductor and a transformer is reduced, and the current stability and efficiency are improved.

Description

technical field [0001] The invention relates to an ultrasonic generator, more specifically to a digital ultrasonic generator and an automatic frequency locking method thereof. Background technique [0002] The ultrasonic generator is an important part of the ultrasonic equipment, responsible for providing ultrasonic frequency power to the ultrasonic transducer. In order to make the ultrasonic transducer work at a high frequency and give full play to the advantages of ultrasonic processing, the vibration system is required to work in a resonant state. Before the general transducer vibration system works, the electrical frequency of the power supply can be adjusted to meet the working conditions of the system in resonance. However, in actual processing, due to the impression of a series of factors such as load changes and system heating, the natural frequency of the vibration system changes. At this time, if the power frequency of the transducer is not adjusted in time, the v...

AI Technical Summary

Problems solved by technology

Therefore, sampling the input current of the half-bridge inverter circuit cannot correctly lock the resonant frequency. Therefore, the ultrasonic transducer cannot work in the resonant state, which affects the conversion efficiency of the ultrasonic transducer, resulting in a large number of inductors and transformers. heat, which affects the stability and efficiency of the circuit

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