Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Silicon controlled rectifier ignition
Patent
1994-05-27
1995-10-31
Pascal, Robert J.
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Silicon controlled rectifier ignition
315224, 315307, 315DIG5, H05B 4136
Patent
active
054632820
ABSTRACT:
An electronic supply for igniting and operating a high-pressure discharge lamp, comprising a first driven main switching device for generating a high-frequency current through an inductive element and a switching element suitable for subsequently supplying current through the inductive element when the first main switching device is non-conducting. The electronic supply is provided with a transformerless level shifter (LS) and with a driver circuit (S) comprising at least a switch drive device for driving the first driven main switching device. The switching element suitable for the subsequent current supply forms a part of a second driven main switching device which provides periodic commutation of the current through the inductive element, while the level shifter is free from any self-induction elements.
REFERENCES:
patent: 3265930 (1962-05-01), Powell
patent: 5087859 (1992-02-01), Blankers
Pascal Robert J.
U.S. Philips Corporation
Vu David H.
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