Piezoelectric transformer-inverter

Details Piezoelectric transformer-inverter Piezoelectric transformer-inverter

1999-04-22

2000-03-28

Berhane, Adolf Deneke

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363131, 310318, H02M 3335, H01L 4108

Patent

active

060440031

ABSTRACT:
A piezoelectric transformer-inverter in which a fluorescent light tube is light-modulated when a frequency controller changes the frequency of a drive voltage applied from a piezoelectric transformer drive circuit to a piezoelectric transformer in correspondence with a light-modulating voltage to thereby change the boost ratio of the piezoelectric transformer. A PWM inverter output variable circuit adjusts an average voltage supplied from a PWM inverter to a piezoelectric transformer drive circuit. When tube current is low, the average voltage is low, and when the tube current is high, the average voltage rises. Consequently, fluctuation in the drive frequency of the piezoelectric transformer is restricted even when the light-modulating voltage changes, making it possible to drive the piezoelectric transformer with a good boost ratio. Since the piezoelectric transformer is always driven close to its resonant frequency, there is almost no surge charge flowing to the transistor for driving the piezoelectric transformer.

REFERENCES:
patent: 5705877 (1998-01-01), Shimada
patent: 5859489 (1999-01-01), Shimada
patent: 5866969 (1999-02-01), Shimada et al.
patent: 5886514 (1999-03-01), Iguchi et al.
patent: 5923542 (1999-07-01), Sasaki et al.
patent: 5923546 (1999-07-01), Shimada
patent: 5942835 (1999-08-01), Furuhashi et al.
patent: 5969963 (1999-10-01), Ohnishi et al.

Affiliated with

Also associated with

Rating

Piezoelectric transformer-inverter does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Piezoelectric transformer-inverter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Piezoelectric transformer-inverter will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1331667