Frequency synchronizing method for discharge tube lighting...

Details Frequency synchronizing method for discharge tube lighting... Frequency synchronizing method for discharge tube lighting...

2007-09-10

2011-11-01

Owens, Douglas W (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S317000, C315S248000, C315S250000, C315S224000, C315S276000

Reexamination Certificate

active

08049435

ABSTRACT:
An oscillator generates a triangular wave signal whose inclination for charging a capacitor and inclination for discharging the same are the same and which is used to turn on/off FETs Qp1and Qn1. A signal generation part generates first drive signal in a period shorter than a half period of the triangular wave signal to drive the Qp1, and generates a second drive signal having a pulse width substantially equal to that of the first drive signal and a phase difference of about 180 degrees with respect to the first drive signal, to drive the Qn1and provide a current to the discharge tube in a direction opposite to the current driven by the first drive signal. Furthermore a pulse current generation circuit converts a synchronization pulse voltage signal into a pulse current that alternates between positive and negative current values.

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