Driving circuit for multisectional piezoelectric transformers us

Details Driving circuit for multisectional piezoelectric transformers us Driving circuit for multisectional piezoelectric transformers us

1997-02-05

1998-05-05

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310319, 310366, H01L 4108

Patent

active

057479143

ABSTRACT:
A transformer circuit (10) for a piezoelectric transformer (12) having dual inputs which can piezoelectrically interfere with one another to provide adjustable output gain. The transformer circuit (10) provides two pulse-position-modulated input signals (18, 20) which are substantially identical waveforms, but being phase shifted from one another. When the signals (18, 20) constructively interfere maximum gain is achieved. When the two signals (18, 20) destructively interfere minimum gain is achieved. The waveforms may be of any arbitrary type including square, sine, triangle, sawtooth or irregular. Both input signals (18, 20) are at a resonant frequency of the piezoelectric transformer (12) and have a fifty percent duty cycle so as to always provide highest efficiency within the transformer (12). In addition, when the two input signals (18, 20) destructively interfere with each other piezoelectrically, the input impedance of the transformer (12) rises so as to lessen power dissipation within the transformer (12) which subsequently reduces adverse heating effects.

REFERENCES:
patent: 2830274 (1958-04-01), Rosen
patent: 3700936 (1972-10-01), Shimizu
patent: 5329200 (1994-07-01), Zaitsu
patent: 5341061 (1994-08-01), Zaitsu
patent: 5365141 (1994-11-01), Kawai et al.
patent: 5391001 (1995-02-01), Rupert et al.
patent: 5440195 (1995-08-01), Ohnishi et al.
patent: 5463266 (1995-10-01), Fukuoka et al.

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