Ultrasonic physiotherapy instrument based on frequency automatic tracking and frequency automatic tracking method

Abstract

The invention discloses an ultrasonic physiotherapy instrument based on frequency automatic tracking. The instrument comprises a microcontroller, a signal generation module, a power amplification module, an impedance matching module and a frequency tracking module. The frequency automatic tracking system adopts a closed loop feedback tracking system; in the working process of an ultrasonic power supply system, the frequency tracking module acquires voltage signals and current signals at two ends of an ultrasonic transducer in real time, converts the signals into a fourth driving signal, and sends the fourth driving signal to the microcontroller so as to output a pulse signal to a fuzzy controller for self-adaptive adjustment; and finally, the pulse signal subjected to self-adaptive adjustment is treated by a DDS circuit, an ultrasonic excitation signal is output, a first driving signal is output through a shaping filter circuit, a second driving signal is output through a duty ratio adjusting circuit, a high-stability and high-precision ultrasonic excitation signal is output through the power amplification module, and a voltage signal and a current signal are output through the impedance matching module, so that the signal output frequency is gradually keeps consistent with the input frequency.

Description

technical field [0001] The invention relates to an ultrasonic physical therapy apparatus, in particular to an ultrasonic physical therapy apparatus based on automatic frequency tracking and a method for automatic frequency tracking. Background technique [0002] Chronic soft tissue injury is a common and frequently-occurring disease, and its etiology has not yet been determined. The conventional treatment method is to use ultrasound therapy. Ultrasound has mechanical effects, thermal effects and physical and chemical effects, and has a positive therapeutic effect on the treatment of different types of chronic soft tissue injuries. [0003] With the development of intelligence and high precision, the performance of ultrasonic power supply has more and more stringent requirements in ultrasonic applications. Due to the uncertainty of the external environment, the natural resonance frequency of the ultrasonic transducer is prone to drift. When the transducer works at the non-re...

AI Technical Summary

Problems solved by technology

Most therapeutic instruments are bulky and complicated to charge, and they are not truly portable

[0006] (2) No frequency automatic tracking function, low sound-electric conversion efficiency

Due to the uncertainty of the external environment, the natural resonance frequency of the ultrasonic transducer is prone to drift. When the transducer works at the non-resonant point, it will not only fail to produce the desired effect, but will also damage the transducer.

[0007] (3) Power adjustable problem

Because different users have different sensitivity to ultrasound, that is to say, the maximum ultrasound dose they can bear is also different. The current ultrasound physiotherapy instrument does not realize the real adjustable output ultrasound power.

[0008] (4) Low degree of intelligence

The conventional physical therapy instrument has a single input frequency, a single frequency output, and a single pulse waveform

[0009] (5) Low safety performance

Conventional physical therapy devices lack fault detection circuits and safety warning functions

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