Zigzag topology for balancing current among paralleled gas...

Electric lamp and discharge devices: systems – Combined load device or load device temperature modifying... – Discharge device load

Reexamination Certificate

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C315S070000, C315S255000, C315S277000, C361S035000

Reexamination Certificate

active

07061183

ABSTRACT:
An apparatus and methods for balancing current in multiple negative impedance gas discharge lamp loads. Embodiments advantageously include balancing transformer configurations that are relatively cost-effective, reliable, and efficient. Embodiments include configurations that are applicable to an unrestrained number of gas discharge tubes, such as cold cathode fluorescent lamps. The balancing transformer configuration techniques permit a relatively small number of power inverters, such as one power inverter, to power multiple paralleled lamps or paralleled groups of lamps with balancing transformers coupling the lamps or groups of lamps in a zigzag topology. One embodiment of a balancing transformer includes a safety winding which can be used to protect the balancing transformer in the event of a lamp failure and can be used to provide an indication of a failed lamp.

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