Driving method of piezoelectric transformer and driving circuit

Details Driving method of piezoelectric transformer and driving circuit Driving method of piezoelectric transformer and driving circuit

1999-02-18

2000-10-17

Dougherty, Thomas M.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

H01L 41107

Patent

active

061336726

ABSTRACT:
A circuit for driving a piezoelectric transformer, which is suitable for driving a piezoelectric transformer having a load such as a cold cathode fluorescent tube, and capable of coping with a wide range of a power source voltage and operating with high efficiency. The driving circuit includes a series circuit constituted by an equivalent input capacitance of the piezoelectric transformer and an inductance circuit and provided between power source terminals, and a switching transistor having both terminals of a main current path thereof in parallel connected to a part of the series circuit including the equivalent input capacitance. The inductance circuit includes a first inductance element of boosting constitution such as an auto-transformer and a second inductance element of non-boosting constitution such as a coil. The first and second inductance elements are selectable alternately. The driving circuit further includes an amplitude detection circuit for detecting an amplitude of a driving waveform between the terminals of the main current path of the switching transistor, and an inductance selection circuit for selecting the first inductance element when the amplitude is lower than a predetermined threshold value and for selecting the second inductance element when the amplitude exceeds the predetermined threshold value.

REFERENCES:
patent: 3708701 (1973-01-01), Kawada
patent: 5739622 (1998-04-01), Zaitsu
patent: 5796213 (1998-08-01), Kawasaki
patent: 5923542 (1999-07-01), Sasaki et al.
patent: 6013969 (2000-01-01), Noma et al.

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