Trilux-lenze Gmbh+co. Kg

Ralf Keggenhoff

Ferdinand Mertens

The invention, which relates to a method for generating a starting voltage for a fluorescent lamp, in which the starting voltage is generated by means of alternating voltage that is impressed on an LC series resonant circuit, and to a corresponding circuit arrangement, is based on the object of increasing the reliability of starting and avoiding maximum permissible starting voltages being exceeded. According to the invention, this object is solved in that the frequency of the alternating-voltage generator can be controlled by a control unit and in that a measuring circuit is connected to the control unit, whereby the alternating voltage can be gradually reduced from a high frequency to a lower frequency, where the lamp voltage is compared to a setpoint value at certain intervals and the starting procedure terminated when the setpoint value is reached.

Method and circuit arrangement for producing an ignition voltage for fluorescent lamps

The invention relates to a method and ballast for operating a lamp ( ) fitted with a fluorescent tube ( ), whereby the operating data of certain recognizable lamp types (T , T , T , T ), at least the lamp voltage (U ), lamp current (I ) and preheating currents (I , I , I , I ) is stored in a register (R) for the heating of the electrodes. The preheating current (I , I , I , I ) are allocated to given areas of the resistance of the electrode (R >X), (Y&lE;R &lE;X), (Z&lE;R &lE;Y), the resistance of the electrode is measured during a preheating phase and the preheating current (I , I , I , I ) allocated to the measured resistance of the electrode (R ) is adjusted, whereby the fluorescent tube ( ) is operated or a given period with a dimming current (I ) of a known intensity within a given starting phase (S) occuring after the preheating phase (V), the existing voltage (U ) of the fluorescent tube is measured, the register (R) is searched for the lamp voltage (U , U , U , U , U ) that comes closest to the measured lamp voltage (U ) of the fluorescent tube ( ) and the operating data required for the operation of the fluorescent lamp ( ) and allocated to the measured lamp voltage (UL) by the register (R) is adjusted.

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Sundern, Germany

Ralf Keggenhoff