Ignition circuit with piezoelectric transformer

Details Ignition circuit with piezoelectric transformer Ignition circuit with piezoelectric transformer

1999-11-09

2000-09-05

Dougherty, Thomas M.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

H01L 41107

Patent

active

061147974

ABSTRACT:
Circuits for use in ignition systems are disclosed 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 converts a DC voltage into an AC voltage which is rectified into a DC signal of sufficiently high voltage to create a spark across the spark gap of a spark plug. 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 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: 3690309 (1972-09-01), Pluzhnikov et al.
patent: 5329200 (1994-07-01), Zaitsu
patent: 5834882 (1998-11-01), Bishop

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