Circuit arrangement for the operation of a fluorescent lamp
AssigneeDiehl GmbH & Co.
InventorsGottfried Stockinger, Jurgen Ludwig
Life of this patent
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Abstract
A circuit arrangement for the operation of a fluorescent lamp which is connectable to an alternating-current power supply, for example, the elctrical power supply on board an aircraft, including a switch which is located between the lamp electrodes, and which is actuatable through the intermediary of a control circuit whereby the lamp electrodes are heated when the switch is closed. A measuring element which is connected to the input of the control circuit determines the decreasing voltage at least at one of the lamp electrodes, and the control circuit will open the switch for the ignition of the fluorescent lamp only when the determined voltage is essentially constant, or has reached a threshold value.
Claims9
Circuit arrangement for the operation of a fluorescent lamp which is connected to an alternating-current power supply, such as an electrical power supply on board aircraft;
- including a switch connected between lamp electrodes of said fluorescent lamp;
- a control circuit for actuating said switch, said lamp electrodes being heated responsive to closing of said switch and said control circuit periodically actuating said switch for connecting said switch to the power supply so that effect dimming of the lamp;
- a measuring element being connected to an input of the control circuit for determining a voltage drop off at least at one of the lamp electrodes and in which the control circuit maintains said switch in a closed condition as long as the voltage determined at said at least one lamp electrode varies or has not reached a specified threshold value and opens the switch for ignition of the fluorescent lamp only when the voltage at said at least one lamp electrode is essentially constant or has reached said threshold value.
Dependencies are inferred from the claim text.