Lamp driver providing synchronization during commutation
AssigneeKoninklijke Philips Electronics N.V.
InventorsLambertus De Brouwer, Patrick Zijlstra
Life of this patent
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Abstract
A lamp driver having two independently operating half-bridges integrated as a down-converter (1) and one as an alternator (2). Ensures that current control and inversion can be performed in a single stage, thereby providing synchronization at commutation moment. May comprise detection means (15, 18) for detecting a defined state of the down-converter (1), in which case commutation is only carried out if it has been requested and the defined state has been detected. A delay circuit (16) may ensure that commutation is always carried out if requested, even if the defined state is not detected.
Claims9
A lamp driver comprising at least two independently operating half-bridges integrated therein, wherein:
- a first of said half-bridges operates as a down-converter (1), thereby determining the output current of the lamp driver, and
- a second of said half-bridges operates as an alternator (2), thereby ensuring that the output current of the lamp driver is an AC current.
Dependencies are inferred from the claim text.