H - Electricity – 05 – B
Patent
H - Electricity
05
B
H05B 41/14 (2006.01) H05B 41/06 (2006.01) H05B 41/295 (2006.01) H05B 41/36 (2006.01)
Patent
CA 2392978
The present invention relates to a circuit arrangement for operating a fluorescent lamp (LA), comprising a half-bridge arrangement (12) whose output signal can be fed to a load circuit (LK; 16), it being possible to connect a fluorescent lamp (LA) with filament electrodes (W1, W2) to the load circuit (LK; 16), a preheating device (L21, L22, CR) for preheating the filament electrodes (W1, W2) of the fluorescent lamp (LA), and a power determining device (20) for determining a preheating power, value that represents a measure of the power that is converted in the filament electrodes (W1, W2) during preheating, wherein the power determining device (20) can be used to determine the power flowing into the load circuit (LK; 16) during preheating. It also relates to a method for operating a fluorescent lamp (LA); in which firstly a fluorescent lamp (LA) is preheated while feeding energy from a half-bridge arrangement (12) into a load circuit (16; LK), the fluorescent lamp (LA), which has filament electrodes (W1, W2) being connected to the load circuit (LK; 16) ; a preheating power value (P act) is determined in this case that represents a measure of the power flowing into the load circuit (16; LK) during preheating. One of at least two sequences (P1, P2) for operating the circuit arrangement ,is then selected as a function of the determined preheating power value (P act).
Schemmel Bernhard
Weirich Michael
Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen Mbh
Smart & Biggar
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