Circuit arrangement with a piezoelectric transformer

Details Circuit arrangement with a piezoelectric transformer Circuit arrangement with a piezoelectric transformer

1998-08-27

1999-12-07

Wong, Dor

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315266, 315276, 310358, 310359, H01L 4108

Patent

active

059989386

ABSTRACT:
The invention relates to a circuit arrangement with a piezoelectric transformer having two electrodes arranged on the primary side of the transformer and such a piezoelectric transformer itself. Piezoelectric transformers of this type are used, for example, for the power supply or control of lamps or electron tubes. For controlling such a piezoelectric transformer directly on the primary side by a most frequently available DC voltage, instead of an AC voltage as is customary, according to the invention a DC voltage source is connected to the electrodes and a switching device is provided for interrupting the supply of voltage to at least one electrode, the positions of the switching device being dependent on the state of expansion of the primary side of the transformer. The switching device is thus periodically closed and opened, the applied DC voltage is thus interrupted periodically.

REFERENCES:
patent: 1834786 (1931-12-01), Kacser
patent: 3247423 (1966-04-01), Nolta et al.
patent: 5241236 (1993-08-01), Sasaki et al.
patent: 5576590 (1996-11-01), Ohnishi et al.
M. Sugimoto et al, "Very Compact Inverter For Color LCD Backlight Utilizing a Packaged Piezoelectric Ceramic Transformer", SID 96, Digest, p. 757-760.

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