Research and application on the frequency automatic tracking of ultrasonic power based on DSP

In this paper, a new type of intelligent high-power ultrasonic power supply based on Digital Signal Processor (DSP) has been developed. According to the characteristic of ultrasonic power supply, the control system software has been programmed. It deals mainly with the drift of the slow frequency for the resonance frequency search module in whole and the frequency automatic tracking module deals with the small transient frequency change. This module is executed in each sampling period. In order to keep fast track the mutations resonance frequency, we has taken strategy in a variable step length in the program module. The further, it improves the stability of the control system. On-line testing shows that, this ultrasonic power supply based on DSP can make the system work at the resonance state, and the vibration process is stable. Both the hardware and software can achieve the expected function.