The designed ultrasonic transducer generator power supply uses a combination of analog circuits and microcontroller control to generate PWM signals, overcoming the inherent defects of analog circuits and achieving flexible and diverse control functions. At the same time, it solves the problem of the microcontroller working frequency not being high enough, and improves the frequency resolution of output PWM. The system has overcurrent, overheating, and overvoltage protection functions, high reliability, and can track the changes in the resonant frequency of the transducer in real-time, with stable output power.

The principle of the ultrasonic transducer generator power supply PWM signal generator is that it uses a combination of a microcontroller and an analog circuit to generate PWM signals. Firstly, the output frequency of the voltage controlled oscillator is set through Rt, and the output is sent to the microcontroller as the clock source for timing/counter 1 (T/C1). Place the T/C1 of the microcontroller in the phase and frequency adjustable PWM working mode. At this time, the upper limit value of the counter determines the frequency of the PWM, while the value of the comparison matching register determines the size of the duty cycle.

Ultrasonic transducer generator power supply This signal generator has great advantages in frequency control, protection signal processing, and automatic frequency tracking. By combining analog circuits with microcontroller control, the frequency accuracy of the scanning signal is improved, and digital control of the frequency and amplitude of the scanning signal is achieved. In terms of processing protection signals, when there are abnormalities in external circuits, the protection signal OV can be used_ I quickly shut off the and door, stop the output of PWM signal, and provide corresponding alarm signal through the indicator light. In addition, the microcontroller can adjust the output frequency of the PWM signal in real-time by detecting the phase difference between the voltage signal and current signal at both ends of the feedback transducer, achieving automatic frequency tracking.

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