Electric power conversion systems – Current conversion – Using semiconductor-type converter
Patent
1999-05-26
2000-04-18
Wong, Peter S.
Electric power conversion systems
Current conversion
Using semiconductor-type converter
310316, H02M 7537, H01L 4108
Patent
active
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.
Bishop Richard Patten
Boyd Clark Davis
Bolduc David J.
Clark Stephen E.
Face International Corporation
Patel Rajnikant B.
Wong Peter S.
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