Research on the ultrasonic driving circuit of music rhythm driven method to suppress the noise of ultrasonic cleaner

Abstract

Ultrasonic cleaners are accompanied by high-frequency noise when cleaning, which stimulates the human's auditory and excites the peripheral nervous system, resulting in poor health.To eliminate this noise, the “masking effect” was applied, which reapplied the auditory characteristics of the human body.This effect is a way to make noise less perceptible by adding natural sounds.In current study, we proposed a new type of music rhythm pulse width modulation (MR-PWM) that based on the theory of adding natural sounds to the noise emitted during ultrasonic cleaning.The MR-PWM signal was produced by STM32F103 module which synthesized ultrasonic generation signal and natural sound, and one ultrasonic transducer emitted ultrasonic and sound simultaneously. The proposed MR-PWM circuit had relatively higher added natural sound (music rhythm) than ultrasonic noise in the space during washing, resulting in the masking effect that could reduce irritability and discomfort. In addition, MR-PWM ultrasonic generator showed an overall good cleaning effect by distributed cavitation in the entire cleaning vessel without decreasing cleaning effect compared to traditional generator.