Capacitive charge pump driver circuit for piezoelectric alarm

Details Capacitive charge pump driver circuit for piezoelectric alarm Capacitive charge pump driver circuit for piezoelectric alarm

1994-11-07

1996-02-20

Roskoski, Bernard

Horology: time measuring systems or devices

Signalling means

Time condition responsive

307110, 363 60, H02M 318

Patent

active

054935431

ABSTRACT:
A capacitive charge pump circuit and associated method is provided for outputting an output voltage which has a magnitude which is an integer multiple of the magnitude of a power supply voltage used to power the circuit. In one form, a capacitor is charged to the power supply voltage, V.sub.s. The capacitor is alternately coupled to the power supply voltage and ground so that in an alternating manner, 2 V.sub.s and -V.sub.s appear across it. By coupling a first electrode of a piezoelectric crystal to the capacitor and a second electrode of the piezoelectric crystal to the power supply voltage, a signal having a peak-to-peak magnitude which is three times that of the power supply voltage will drive the piezoelectric crystal.

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patent: 5397928 (1995-03-01), Chan et al.

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