Method and circuit for exciting an ultrasonic generator and the

Details Method and circuit for exciting an ultrasonic generator and the Method and circuit for exciting an ultrasonic generator and the

1988-08-16

1989-09-19

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 4, 331 65, 331158, 310316, H03L 706, H03L 708, H03L 712, H01L 4108

Patent

active

048685216

ABSTRACT:
A method and a circuit for exciting an ultrasonic generator comprises a control loop which includes the ultrasonic generator itself and a voltage-controlled oscillator. The control loop keeps the active power consumption to a desired value, which is compared in a comparator with the instantaneous active power consumption. One output of a further rectangular oscillator is connected to the control input of the voltage-controlled oscillator. The rectangular oscillator is put into operation if in the control loop there are no control oscillations or only those which are smaller than a predetermined threshold. The output of the rectangular oscillator is connected across one diode to the control input of the voltage-controlled oscillator and across another diode to the controlled input of comparator. The additional signal is applied to the voltage-controlled oscillator, apart from the control signal of the control loop. The cycle of the additional signal is longer than the change time constant at the control input of the voltage-controlled oscillator and the additional signal swing is selected in such a way that the frequency of oscillator passes through a predetermined frequency range.

REFERENCES:
patent: 3432691 (1969-03-01), Shoh
patent: 3975650 (1976-08-01), Payne
patent: 4445064 (1984-03-01), Bullis
patent: 4562413 (1985-12-01), Mishiro et al.
patent: 4583529 (1986-03-01), Briggs

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