Drive circuit for a power-saving lamp

Details Drive circuit for a power-saving lamp Drive circuit for a power-saving lamp

1997-04-08

1999-11-09

Le, Hoanganh

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315307, 315225, H05B 3702

Patent

active

059821078

ABSTRACT:
The object of the invention in to provide a drive circuit in which a high efficiency can be achieved and with which the voltage spikes reacting on the supply network are virtually zero. For this purpose, the discharge lamp (FL) is connected by its first electrode (E1), by means of a connecting line (VL), to the junction (H) between the emitter resistor (R3) of the first transistor (T1) and the collector of the second transistor (T2) of the high-frequency resonant circuit. The discharge lap (FL) in connected by its second electrode (E2) to the neutral conductor (0). As a result, the supply current with the superimposed control frequency flows via the load. Consequently, voltage spikes are compensated for and the efficiency in considerably increased.

REFERENCES:
patent: 5543690 (1996-08-01), Bernicke et al.
Laskai L. et al., "A Unity Power Factor Electronic Ballast for Metal Halide Lamps", Feb. 13, 1994, pp. 31-37.

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