DC-AC converter circuit using resonating multi-layer piezoelectr

Electric power conversion systems – Current conversion – Using semiconductor-type converter

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310316, H02M 7537, H01L 4108

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06052300&

ABSTRACT:
DC-AC voltage transformation circuits are provided which use a resonating piezoelectric transformer along with complementary circuit components, to efficiently convert a DC first voltage to a transformer-output AC second voltage. In the preferred embodiment of the invention, A High Displacement Piezoelectric (HDP) transformer achieves sufficiently high voltage output to "cold fire" a gas discharge lamp. The disclosed circuit may be modified using conventional electrical sub-circuitry to pre-heat the cathodes of the lamp. The transformer circuit may be a "self resonating" circuit which relies on an initial pulse from turning on the DC power supply to cause the transformer to begin resonating. In a modified voltage converter circuit, the circuit is not "self resonating" and instead has a phase shift oscillator sub-circuit that provides small pulse signals to start the transformer resonating when the circuit is initially turned on.

REFERENCES:
patent: 4554477 (1985-11-01), Ratcliff
patent: 5329200 (1994-07-01), Zaitsu
patent: 5341061 (1994-08-01), Zaitsu
patent: 5654605 (1997-08-01), Kawashima
patent: 5739679 (1998-04-01), Takehara et al.

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