Electric lamp and discharge devices: systems – Pulsating or a.c. supply – With power factor control device
Patent
1995-02-23
1996-03-19
Pascal, Robert J.
Electric lamp and discharge devices: systems
Pulsating or a.c. supply
With power factor control device
315308, 315DIG4, H05B 3700
Patent
active
055005730
ABSTRACT:
A dimmer circuit for gas discharge lamps, having an electronic ballast equipped with a first converter circuit which first transforms an applied voltage by means of switching transistors into a first high-frequency alternating voltage. This first high-frequency alternating voltage is fed indirectly or directly to the gas discharge lamp. The dimmer circuit also includes a second converter circuit connected upstream. The second converter circuit is arranged so as to transform an input voltage into a second high-frequency alternating voltage and is also arranged so as to rectify the second high-frequency alternating voltage to produce a rectified output voltage. After rectification, the rectified output voltage is fed to the first converter circuit as the above-mentioned applied voltage. The second converter circuit contains switching means which, operated manually or by remote control, influence the magnitude of the rectified output voltage from the second converter circuit.
REFERENCES:
patent: 5107184 (1992-04-01), Hu et al.
Hilite Lighting and Electronics Ltd.
Pascal Robert J.
Ratliff Reginald A.
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