AUTOMATIC TRACKING SYSTEM OF FREQUENCY

摘要

The device performs the automatic frequency-tracking of the ultrasonic oscillator circuit to compensate a variation of the weight of laundry or of characteristics of the vibration of the ultrasonic oscillator. The device comprises a converter to emit ultrasonic wave into a tube of a washing machine, a signal detector to detect output of the converter, an A/D converter to transform the detected signal into a digital signal, a microcomputer to determine the variation of the oscillation frequency, an interface to transform signal into suitable signal wave with a changed frequency, a frequency controller and a ultrasonic oscillator.