Design of an Emerging Ultrasonic Transmitting and Receiving Circuit for Ultrasonic Testing Method of Internal Structure of Transformer

In order to realize the application of ultrasonic wave in the internal structure detection of transformer, an ultrasonic transmitting and receiving circuit based on STM32 is designed. The transmitting circuit includes an optocupler isolation circuit, a MOSFET driving circuit, a push-pull conversion circuit and an impedance matching circuit, etc., and generates a high-voltage excitation pulse. The receiving circuit includes an amplitude limiting circuit, a preamplifying circuit, a band pass filtering circuit and an automatic gain control circuit to implement processing of the ultrasonic echo signal. The actual test shows that the ultrasonic excitation signal generated by the system is small in noise, steep in waveform, clear in echo signal after processing, good in system performance, simple in structure, stable and reliable, and has good promotion value.