Driving method and driving circuit of piezoelectric transformers

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

1998-06-17

2000-07-11

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310318, 315277, 315DIG5, H01L 4108

Patent

active

06087757&

ABSTRACT:
A driving circuit of the present invention includes first and second piezoelectric transformers 12, 14 for outputting a voltage at a secondary terminal which is input from a primary terminal utilizing a piezoelectric effect, frequency control means 21 for outputting a frequency signal for operating the first piezoelectric transformer 12 at a required frequency voltage, phase reversing means 16 for reversing a phase of the frequency signal by 180 degrees, driving circuits 13, 15 for applying a frequency voltage to each of the piezoelectric transformers 12, 14 based on these frequency signals of which phases are different from each other by 180 degrees, a discharge tube 11 in which an output of the first piezoelectric transformer 12 is applied to a first input terminal and an output of the second piezoelectric transformer 14 is applied to a second input terminal, a circuit 20 for controlling a voltage of the first piezoelectric transformer 12 so that a current flowing in this discharge tube becomes to be constant, and circuits 22, 17 for controlling a voltage input to the second piezoelectric transformer 14 so that output voltages of the first and second piezoelectric transformers become to be the same voltages.

REFERENCES:
patent: 3707636 (1972-12-01), Inoue
patent: 4459505 (1984-07-01), Lim
patent: 5731652 (1998-03-01), Shimada
patent: 5739622 (1998-04-01), Zaitsu
patent: 5796213 (1998-08-01), Kawasaki
patent: 5886514 (1999-03-01), Iguchi
patent: 5894184 (1999-04-01), Furuhashi et al.

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