Push-pull driving device and method with protection

Abstract

The invention provides a push-pull driving device with protection. The push-pull driving device with protection comprises a square wave generating unit and a driving signal generating unit, wherein the square wave generating unit is suitable for generating two paths of pulse signals with the same cycle and opposite phase positions according to a pulse width modulation signal source; and the driving signal generating unit is suitable for modulating the two paths of pulse signals with the same cycle and opposite phase positions separately to generate two paths of pulse width modulation driving signals with overtime protection functions. The invention also provides a method for generating the push-pull driving device with protection. The method comprises the following steps: adopting the pulse width modulation signal source as input and performing frequency division on the pulse width modulation signal source into two paths of pulse signals with the same duty ratio and opposite phase positions; and modulating the two paths of pulse signals separately to generate two paths of pulse width modulation driving signals with overtime protection functions. The pulse width modulation driving signal can be applied to power driving circuits with opposite phase positions such as a driving push-pull circuit and a full bridge circuit; and when the pulse width modulation signal is in an abnormal condition, normal work of a switch tube can be guaranteed and the aim of protecting the switch tube is fulfilled.

Description

technical field [0001] The invention relates to the field of ultrasonic technology, in particular to a protected push-pull drive device and method. Background technique [0002] An ultrasonic transducer is a device that can convert electrical energy into sound energy and sound energy into electrical energy. Its working principle is based on the forward and reverse piezoelectric effect of the piezoelectric material, and the reverse piezoelectric effect is used to generate ultrasonic waves, that is, an alternating sinusoidal signal of a certain frequency is added to the piezoelectric material, and the material will change with the frequency of the applied signal. Mechanical deformation, and then generate a mechanical wave in the surrounding medium. If its vibration frequency is in the ultrasonic range, this mechanical wave is ultrasonic. When receiving, the positive piezoelectric effect is used to convert the acoustic signal from the detection object into an electrical signal...

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Problems solved by technology

[0004] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a push-pull drive device and method with protection, which is used to solve the problem in the prior art that the switch tube cannot be guaranteed to work normally when the drive signal is abnormal

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