High frequency discharge lamp operating circuit with resonant po

Details High frequency discharge lamp operating circuit with resonant po High frequency discharge lamp operating circuit with resonant po

1995-08-15

2000-09-12

Kinkead, Arnold

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

With power factor control device

315205, 315219, 315DIG7, 315209R, H05B 4116

Patent

active

061182257

ABSTRACT:
A circuit arrangement comprising a DC-AC converter for operating a lamp (La). A first capacitor is connected across first and second inputs of the DC-AC converter. A first coil and a second capacitor are connected in a series circuit to first and second outputs of a rectifier circuit coupled to an AC supply voltage. Two diodes are serially connected between the first output and the first input. A third capacitor is connected between a junction point of the two diodes and a junction point between two series connected transistors of the DC-AC converter. The diodes, the coil (L1) and the second and third capacitors (C2, C3) are so dimensioned that the resonance frequency of a series circuit of the coil and the second and third capacitors connected in parallel is approximately equal to the operating frequency of the DC-Ac converter. As a result, the circuit arrangement has a high power factor.

REFERENCES:
patent: 4375608 (1983-03-01), Kohler
patent: 4511823 (1985-04-01), Eaton et al.
patent: 4782268 (1988-11-01), Fahnrich et al.
patent: 4808887 (1989-02-01), Fahnrich et al.
patent: 5303140 (1994-04-01), Shimizu
patent: 5412287 (1995-05-01), Shackle

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