Ultrasonic drive circuit and method, fingerprint recognition device and electronic equipment

Abstract

The invention relates to the technical field of ultrasonic drive, in particular to an ultrasonic drive circuit and method, a fingerprint recognition device and electronic equipment. The ultrasonic drive circuit comprises a power circuit, a drive circuit body and a resonance circuit, wherein the power circuit and the resonance circuit are electrically connected through the drive circuit body. The resonance circuit comprises an electrical inductor and an ultrasonic transmitting element, one end of the electrical inductor is electrically connected with the drive circuit body, and the other end ofthe electrical inductor is electrically connected with the ultrasonic transmitting element. The ultrasonic transmitting element is an ultrasonic transmitting element with stray capacitance. The drivecircuit is used for outputting drive signals after amplifying input signals. After the drive signals are subjected to resonance through the electrical inductor and the stray capacitance, electrical signals are generated, and accordingly the ultrasonic transmitting element is triggered to emit ultrasonic waves. The circuit design flexibility is high, power consumption is low, the circuit is relatively simple, and the drive effect is better.

Description

【Technical field】 [0001] The invention relates to the field of ultrasonic driving technology, in particular to an ultrasonic driving circuit and a driving method, a fingerprint identification device and electronic equipment. 【Background technique】 [0002] Ultrasound is widely used in non-destructive testing, distance measurement and thickness measurement in industry, ultrasonic breeding, ultrasonic seedling cultivation and ultrasonic induced labor in agriculture, biomedical diagnosis and surgery, and fingerprint identification in consumer electronics. [0003] In the ultrasonic application field, the ultrasonic transmitting circuit is a key component in the system. With the development of electronic technology and the continuous improvement of performance and accuracy requirements of measuring devices, such as fingerprint recognition modules, they have been developed towards high precision, high sensitivity and low power consumption. But at present, there are many design m...

AI Technical Summary

Problems solved by technology

But at present, there are many design methods for the ultrasonic transmitting circuit, but the circuit is complicated and the driving effect is not good.

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