Piezoelectric transformer inverter

Details Piezoelectric transformer inverter Piezoelectric transformer inverter

1999-09-30

2000-11-07

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

H01L 4108

Patent

active

061441392

ABSTRACT:
A piezoelectric transformer inverter includes: a piezoelectric transformer, one of whose primary electrodes is grounded, which performs voltage conversion of alternating voltage or direct current voltage applied between the primary electrodes and supplies the converted voltage to a load connected to a secondary electrode; a drive unit for supplying alternating voltage or direct current voltage between the primary electrodes of the piezoelectric transformer; a low-pass type resonance circuit unit inserted between the output of the drive unit and the primary electrodes of the piezoelectric transformer; a duty control unit for controlling ON-Duty of the drive unit so that a value of current flowing into the load coincides with a targeted current value; a phase-difference detection unit for detecting a phase difference between the input voltage and the output voltage of the piezoelectric transformer; and a frequency control unit for controlling a driving frequency of the drive unit.

REFERENCES:
patent: 5705879 (1998-01-01), Abe et al.
patent: 5731652 (1998-03-01), Shimada
patent: 5739622 (1998-04-01), Zaitsu
patent: 5796213 (1998-08-01), Kawasaki
patent: 5894184 (1999-04-01), Furuhashi et al.
patent: 5942835 (1999-08-01), Furuhashi et al.
patent: 5962953 (1999-10-01), Sasuki et al.
Naoki Wakoh, et al., Liquid Crystal Display Back-light Inverter Utilizing Piezoelectric Transformer, "The Institute of Electronics, Information and Communication Engineers", pp. 17-21 (1995).

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