Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Silicon controlled rectifier ignition
Patent
1997-07-07
1999-02-02
Wong, Don
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Silicon controlled rectifier ignition
315247, 315DIG5, H05B 3700
Patent
active
058669892
ABSTRACT:
A circuit arrangement for operating a discharge lamp. Input terminals are coupled to the poles of a supply voltage source which delivers a low frequency supply voltage. A rectifier is coupled to the input terminals for rectifying the low frequency supply voltage. A branch interconnects output terminals of the rectifier and includes a series arrangement of a first diode, a second diode, and a third diode. The first and second diodes are shunted by a first capacitor. The second and third diodes are shunted by a second capacitor. A resistor passes current during lamp operation with which the first and second capacitors are charged. Lamp current is generated based on the voltages across the first and second capacitors. The resistor is placed in a branch which passes a low frequency alternating current during lamp operation and which connects an input terminal to an input of the rectifier. The circuit arrangement has a high power factor. Radio frequency interference generated in producing the lamp current is effectively suppressed.
REFERENCES:
patent: 5134344 (1992-07-01), Vos et al.
patent: 5387847 (1995-02-01), Wood
Franzblau Bernard
U.S. Philips Corporation
Vu David H.
Wong Don
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