Process and apparatus for phase-regulated power and frequency co

Details Process and apparatus for phase-regulated power and frequency co Process and apparatus for phase-regulated power and frequency co

1988-01-25

1989-07-18

Salce, Patrick R.

Electric power conversion systems

Current conversion

With starting arrangement

310316, 2391022, 323901, H01L 4108, H03B 532

Patent

active

048498726

ABSTRACT:
A phase-regulated power and frequency control of an ultrasonic transducer which is supplied by a variable frequency oscillator of a phase control circuit with a plurality of voltage pulses amplified by a driver. First the variable frequency oscillator is canned to find a resonance frequency of the ultrasonic transducer and the scanner is locked to the resonance frequency of the ultrasonic transducer after locking into the phase control circuit. After initial oscillation of the ultrasonic transducer in the vicinity of a series resonance frequency thereof a capacitive phase angle between voltage and current is introduced and is maintained operationally so that by phase control of the phase control circuit the operating frequency of the oscillator is reduced relative to the series resonance frequency of the transducer. A phase angle change as a result of mechanical loading of the transducer leads to an increase of the operating frequency of the oscillator and thus to a shift toward the series resonance frequency of the transducer.

REFERENCES:
patent: 3889166 (1975-06-01), Scurlock
patent: 3975650 (1976-08-01), Payne
patent: 4271371 (1981-06-01), Furuichi et al.
patent: 4275363 (1981-06-01), Mishiro et al.
patent: 4302728 (1981-11-01), Nakamura
patent: 4445063 (1984-04-01), Smith
patent: 4551690 (1985-11-01), Quist
patent: 4562413 (1985-12-01), Mishiro et al.
patent: 4626728 (1986-12-01), Flachenecker et al.
patent: 4632311 (1986-12-01), Nakane et al.
patent: 4703213 (1987-10-01), Gasler

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