Driving circuit for driving a piezoelectric vibrator

Details Driving circuit for driving a piezoelectric vibrator Driving circuit for driving a piezoelectric vibrator

1989-05-19

1990-07-03

Wong, Peter S.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310317, 363 21, 363 97, H01L 4108, H02M 3335

Patent

active

049394029

ABSTRACT:
A single transistor type driving circuit for a piezoelectric vibrator. The driving circuit includes a transformer having a primary winding and a secondary winding, a single switching transistor connected in series with the primary winding, the piezoelectric vibrator being connected with the secondary winding, a transistor driving circuit for applying driving current to the switching transistor so that the switching transistor is alternately turned on and off to thereby drive the vibrator at or in the vicinity of a resonating frequency of the vibrator. A coil is connected in series with the piezoelectric vibrator so that current and voltage of sinusoidal form are applied to the vibrator. A phase comparator compares phase of the sinusoidal current at the piezoelectric vibrator with phase of voltage at the secondary winding of the transformer to produce a phase difference signal, and the frequency of the driving current is controlled in accordance with the phase difference signal.

REFERENCES:
patent: 4275363 (1981-06-01), Mishiro et al.
patent: 4562413 (1985-12-01), Mishiro et al.
patent: 4562523 (1985-12-01), Rodel et al.
patent: 4626728 (1986-12-01), Flachenecker et al.

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