Fluorescent lamp operating circuit, permitting dimming of the la

Details Fluorescent lamp operating circuit, permitting dimming of the la Fluorescent lamp operating circuit, permitting dimming of the la

1995-01-17

1996-02-20

Pascal, Robert J.

Electric lamp and discharge devices: systems

Current and/or voltage regulation

315307, 315308, 315311, 315314, 315DIG4, G05F 100

Patent

active

054931827

ABSTRACT:
To provide for dimmer operation of a fluorescent lamp (L) with a minimum of circuit components, the d.c. output level at an output terminal (C1) of an energy supply source, such as a switched mode power supply (10, 10'), is controlled in accordance with the setting of a dimmer control (D). The voltage level at the output capacitor (C1) of the switched mode d.c. power supply furnishes supply voltage for an inverter (T1, T2) coupled to the discharge lamp. During lamp operation, a control unit (R) controls the level of the d.c. voltage supply for the inverter in accordance with the dimmer setting. This permits change of the brightness of the fluorescent lamp (L) in a range of from 5% to 100% of nominal value. Preferably, control of the supply voltage for the inverter is activated only upon occurrence of the ignition or arc-over phase, for example under control of a timing circuit (ZS), controlling a relay in the preheating circuit of the lamp. The system has the advantage that the lamp does not fire or ignite at full power level but only at the power level controlled by the dimmer (D).

REFERENCES:
patent: 4808887 (1989-02-01), Fahnrich et al.
patent: 5041763 (1991-08-01), Sullivan et al.
patent: 5122712 (1992-06-01), Hirschmann
patent: 5187414 (1993-02-01), Fellows et al.
patent: 5262701 (1993-11-01), Derra et al.
patent: 5394064 (1995-02-01), Ranganath et al.
IBM Technical Disclosure Bulletin, vol. 35, No. 7, Dec. 1992, pp. 28-29, mbined Dimmer and Voltage Regulator Circuit For Fluorescent Lamp Inverter".
"Getaktete Stromversorgung"(Switched Power Supplies), by J. Beckman, published by Franzis-Verlag GmbH, p. 17-19 (1990).
"Schaltnetzteile")Switched Circuitry) by W. Hirschmann and A. Hauenstein, published by Siemens AG, Edition 1990 , p. 63.

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