Piezoelectric transformer inverter

Details Piezoelectric transformer inverter Piezoelectric transformer inverter

1999-09-17

2000-11-28

Budd, Mark

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

315209PZ, H01L 4108

Patent

active

061539627

ABSTRACT:
A piezoelectric transformer inverter comprises: a piezoelectric transformer for performing voltage conversion of alternating voltage applied between primary electrodes to supply to a load connected to a secondary electrode; a driving-frequency control unit for controlling load current during driving of the load by changing the driving frequency of the piezoelectric transformer; a chopper unit for chopping input voltage applied into the driving-frequency control unit at a frequency of two or more times as high as the driving frequency and for controlling an average input voltage applied into the driving frequency control unit by changing a duty ratio of the chopping operation; and a dimming unit for intermittently stopping the driving frequency control unit by intermittently stopping the operation of the chopper unit at a frequency smaller than the driving frequency of the piezoelectric transformer, wherein even during a period in which the dimming unit is intermittently stopping the chopper unit, signals having a duty ratio for allowing the chopper unit to perform the chopping operation to be sustained inside the chopper unit.

REFERENCES:
patent: 5705879 (1998-01-01), Abe et al.
patent: 5894184 (1999-04-01), Furuhashi et al.
patent: 5942835 (1999-08-01), Furuhashi et al.
U.K. Search Report issued Oct. 18, 1999 in a related application.

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