Ultrasonic probe is a kind of transducer that converts the electric energy of super audio frequency into mechanical vibration. It is widely used in the fields of ultrasonic processing, diagnosis, cleaning and industrial non-destructive testing. It needs impedance matching with the generator to work at the most Good condition. Series matching can effectively filter the high-order harmonic components in the square wave output of the switching power supply, so it is widely used. The matching inductor works in a non-resonant state, which causes the power loss and heat generation of the transducer, which causes the output energy to drop significantly, and even stops the vibration, which is limited in practical applications. Therefore, when the inverter tracks the resonance point to adjust the switching frequency, the matching inductance should be changed at the same time to make the resonance system work in the highest efficiency state.
The system composed of the ultrasonic probe and the matching network is actually a coupled system, so the basic principle of coupling oscillation is used to analyze the relationship between the matching inductance and the coupling resonance frequency. When the working frequency of the transducer changes, the matching inductance must be changed accordingly to make the system more efficient.
Post time: Nov-10-2021