DC-AC converter circuit using resonating multi-layer piezoelectric transformer
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United States of America Patent
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Apr 18, 2000
Grant Date -
N/A
app pub date -
May 26, 1999
filing date -
Nov 9, 1998
priority date (Note) -
Expired
status (Latency Note)
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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.
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