Phased Transducer and Drive System Design

Abstract

The multi-element phase-controlled transducer has the advantages of adjustable focal length and transcranial focusing. It has become a research hotspot in recent years. The structure of the phase-controlled transducer and its driving system are the key to determine whether HIFU can be applied to the clinic through the treatment of brain tumors. At present, the structural design of multi-element phase-controlled transducers and high-precision multi-channel drive design are a major difficulty. Based on PZT-8 piezoelectric ceramics, a 256-element random-distributed phase-controlled transducer is designed. Based on FPGA, stm32 and class-E power amplifier circuits, a 2-channel array element driving system is designed. The results show that the resonant frequency difference of the transducer array element is less than 1%, the delay accuracy of the drive system is 10 ns, and the peak-to-peak value of the single-channel output voltage of the transducer is 20.9V, which can meet the needs of HIFU for the treatment of brain tumors.