Self tuned ultrasonic generator system having wide frequency ran

Details Self tuned ultrasonic generator system having wide frequency ran Self tuned ultrasonic generator system having wide frequency ran

1988-06-20

1989-09-19

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

H01L 4108

Patent

active

048684457

ABSTRACT:
This self tuned ultrasonic generator system for driving a piezoelectric transducer has a phase lock loop circuit for automatically finding and maintaining optimum drive of the transducer over a frequency range of at least 25% of a specified center frequency, regardless of variations of load, temperature, and configurations of the transducer. The loop circuit employs a voltage controlled oscillator driving a switching amplifier which powers the transducer. The signal from the oscillator is fed to a digital phase detector which receives as another input a sample of the current driving the transducer such that a phase comparison voltage from the detector is 15 applied to and controls the voltage of the oscillator. Another current sample is applied to a power supply to control the power supplied to the switching amplifier.

REFERENCES:
patent: 3842340 (1974-10-01), Brandquist
patent: 3931533 (1976-01-01), Raso
patent: 3975650 (1976-08-01), Payne
patent: 4271371 (1981-06-01), Furuichi et al.
patent: 4275363 (1981-06-01), Mishiro
patent: 4277758 (1981-07-01), Mishiro
patent: 4371816 (1983-02-01), Wieser
patent: 4468581 (1984-08-01), Okada et al.
patent: 4626728 (1986-12-01), Flachenecker
patent: 4748365 (1988-05-01), Poupaert

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