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US 7,095,184 B2Granted
Electronic ballast for a lamp to be operated using iterative voltage pulses
AssigneePatent-Treuhand-Gesellschaft Fur Elektrisch Gluhlampen Mbh
InventorsHarald Dellian, Reinhard Lecheler, Oskar Schallmoser
Life of this patent
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Abstract
A ballast and its operating method for a dielectrically impeded discharge lamp. The ballast contains a transformer having a third winding which can be short-circuited via a switch. By so doing, the injection of the voltage pulse into the lamp circuit may be controlled by an external trigger signal.
Claims10
An electronic ballast for a lamp comprising:
- an inductance for producing iterative voltage pulses in a lamp circuit containing the lamp,
- the inductance has a first winding through which current is applied by a voltage source via a first controllable switch and which is isolated from the voltage source by the first switch,
- the inductance has a second winding coupled to the first winding and short-circuited by a controllable second switch, of the inductance for producing an operating phase for the ballast, in which the second winding is short-circuited at a low resistance, the operating phase is ended by a trigger signal input externally to the ballast, and
- a pulse-shaping circuit for shaping the trigger signals, the pulse start of the shaped trigger signal pulse resulting in the second switch opening, and the pulse end of the shaped trigger signal pulse resulting in the second switch closing.
1 more element
Dependencies are inferred from the claim text.