Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Silicon controlled rectifier ignition
Patent
1997-06-25
1999-11-09
Pascal, Robert
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Silicon controlled rectifier ignition
315219, 315244, 315DIG7, 363132, H05B 3702
Patent
active
059821086
ABSTRACT:
A circuit arrangement including a DC/AC converter for operating a discharge lamp. The DC/AC converter includes input terminals for connection of the DC/AC converter to a DC voltage source, and a switching circuit connected to the input terminals and provided with at least one switching element. The switching element has a control electrode and a main electrode and a control circuit between the main electrode and the control electrode for generating a control signal for the switching element. The switching element is conductive when a voltage is present between the control electrode and the main electrode with a first polarity having a value which exceeds a threshold value. A load branch includes at least inductive means and output terminals for connection of the discharge lamp, which load branch is supplied via the switching circuit. The control circuit also generates a DC voltage component between the control electrode and the main electrode with a polarity which is opposed to the first polarity. The switching element has fast switching capability including short duty cycles.
REFERENCES:
patent: 5087862 (1992-02-01), Mita et al.
patent: 5332951 (1994-07-01), Turner et al.
Holt "Electronic Circuits Digital and Analog" 1978 pp. 454-455.
Buij Arnold W.
Jacobs Ronny A. A. M.
Blocker Edward
Franzblau Bernard
Pascal Robert
Shingleton Michael
U.S. Philips Corporation
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