Lamp voltage feedback system and method for open lamp...

Details Lamp voltage feedback system and method for open lamp... Lamp voltage feedback system and method for open lamp...

2005-11-08

2008-09-09

Owens, Douglas W. (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

C315S312000

Reexamination Certificate

active

07423384

ABSTRACT:
A circuit comprises a detector circuit and a protection triggering circuit in a discharge lamp system. The detector circuit detects both open lamp and shorted lamp conditions and is coupled with detecting devices, such as sensing capacitors. A DC bias is added to the sensing capacitors so that capacitor voltages are always greater than zero volts. The output voltage of the detector circuit is coupled to the protection triggering circuit, which triggers an open lamp protection when open lamp condition occurs and a shorted lamp protection when shorted lamp condition occurs.

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