초록 ▼

A drive circuit for an ultrasonic atomizer comprising a switching mode power driver circuit and an oscillator circuit to drive the power driver circuit with a signal proportional to the phase response of the atomizer\s transducer element so as to fix the frequency of the power delivered to the atomi

A drive circuit for an ultrasonic atomizer comprising a switching mode power driver circuit and an oscillator circuit to drive the power driver circuit with a signal proportional to the phase response of the atomizer\s transducer element so as to fix the frequency of the power delivered to the atomizer at the frequency of the transducer. The oscillator circuit has an oscillator which generates and supplies said drive signal, an integrated circuit phase-locked loop in a feedback loop arrangement to detect the transducer\s phase response and signal the oscillator to shift its drive signal frequency to the transducer\s frequency and a second order low pass filter to control the rate of the oscillator frequency shift.

대표청구항 ▼

An ultrasonic transducer drive circuit comprising: (a) variable power driving means for supplying power to and driving the transducer; (b) oscillating means for generating and supplying a drive signal, with a frequency proportional to the phase response of the transducer during operation, to the pow

An ultrasonic transducer drive circuit comprising: (a) variable power driving means for supplying power to and driving the transducer; (b) oscillating means for generating and supplying a drive signal, with a frequency proportional to the phase response of the transducer during operation, to the power driving means, said drive signal fixing the frequency of the power supplied to the transducer substantially at the frequency of the transducer; (c) phase detecting and locking means for detecting the phase response of the transducer during operation and inputting a signal proportional thereto to the oscillating means such that the frequency of the oscillating means is shifted proportional to the phase response of the transducer; and (d) low pass filter means, coupled between the oscillating means and the phase detecting and locking means, for controlling the rate of the frequency shift of the oscillating means in response to said inputted signal from the phase detecting and locking means.