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US 6,611,112 B2Granted
Appliance for discharge lamps with reliable starting
AssigneePatent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH
InventorsFranz Raiser, Bernhard Reiter
Life of this patent
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Abstract
Appliance for discharge lamps, which has a load circuit with a resonance point at a resonant frequency fres. In order to start the discharge lamps, the load circuit is fed with a square-wave source voltage Uq, whose period duration Tper multiplied by the resonant frequency fres of the load circuit produces approximately a natural number n which is greater than 1. The pulse duration Tpulse at the source voltage Uq is in a range which is described by the following condition: 0.3 fres ≤ Tpulse ≤ 1 fres
Claims6
An appliance for discharge lamps (Lp) having the following features:
- a load circuit which has an input which is connected to an AC voltage generator, which emits a square-wave source voltage Uq with a period duration Tper and a pulse duration Tpulse,
- the load circuit has an output, which can be connected to discharge lamps (Lp),
- the load circuit has a resonance point at a resonant frequency fres, which means that the voltage at the output (ULp) may be greater than the voltage at the input (Uq),
- characterized in that
- in order to start discharge lamps (Lp), the AC voltage generator emits a source voltage Uq whose period duration Tper multiplied by the resonant frequency fres of the load circuit produces approximately a natural number n which is greater than 1, and
- whose pulse duration Tpulse is in a range which is described by the following condition:
- 0.3 fres ≤ Tpulse ≤ 1 fres
4 more elements
Dependencies are inferred from the claim text.