Automatic tuning system for ultrasonic generators

Details Automatic tuning system for ultrasonic generators Automatic tuning system for ultrasonic generators

1987-09-28

1989-02-28

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Search sweep of oscillator

156 732, 228 45, 228110, 331154, 366116, H03L 700

Patent

active

048089486

ABSTRACT:
Apparatus for periodically sweeping a voltage controlled oscillator over a range of frequencies which includes a resonant frequency of a transducer being supplied with power by the voltage controlled oscillator through a power amplifier. The apparatus includes a digital phase detector having a voltage input coupled to the output of the power amplifier and a second voltage input coupled to a current sensor indicative of the phase of the current flowing through the supply circuit of the transducer to provie at the output of the phase detector a voltage signal indicative of phase difference between the voltage and the current in the transducer. The output of the phase detector is coupled to a processor and to the input of a summing circuit. The output of the processor is also coupled to the summing circuit to provide an offset voltage which adjusts the voltage controlled oscillator to the resonant frequency of the transducer.

REFERENCES:
patent: 3826993 (1974-07-01), White
patent: 4056761 (1977-11-01), Jacoby et al.
patent: 4168916 (1979-09-01), Yamada et al.
patent: 4275363 (1981-06-01), Mishiro et al.
patent: 4558596 (1985-12-01), McBrearty et al.

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