Fixed operating frequency inverter for cold cathode...

Details Fixed operating frequency inverter for cold cathode... Fixed operating frequency inverter for cold cathode...

2005-07-19

2005-07-19

Philogene, Haissa (Department: 2828)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

C315S194000, C315S2090SC, C315S291000, C315S307000, C315SDIG005, C315SDIG007

Reexamination Certificate

active

06919694

ABSTRACT:
A method of driving a lamp that uses a DC to AC inverter that is connected to a primary winding of a transformer is disclosed. The inverter frequency is variable, and in one embodiment, may be controlled by a voltage controlled oscillator. Circuitry is included that monitors the phase relationship between a voltage across a secondary of the transformer and a current through the primary of the transformer. The circuitry monitors the phase relationship and adjusts the inverter frequency, such as by adjusting voltage controlled oscillator, so that the phase relationship is maintained at a predetermined relationship.

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patent: 1296542 (2003-03-01), None

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