Balanced feedback system for floating cold cathode fluorescent l

Details Balanced feedback system for floating cold cathode fluorescent l Balanced feedback system for floating cold cathode fluorescent l

1999-01-22

2000-10-10

Wong, Don

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

315307, 315DIG7, H05B 3702

Patent

active

06130509&

ABSTRACT:
An apparatus and method are provided for driving a cold cathode fluorescent lamp in a floating configuration with an inverter circuit having a transformer with a primary winding and two secondary windings. At least one sense resistor is coupled in series between terminals of the secondary windings. The other terminal of each secondary winding is coupled to a respective end of the fluorescent lamp. A rectifier is coupled to the secondary portion of the transformer to receive a signal indicative of the current in at least one end of the fluorescent lamp and generates a feedback signal. A control and drive circuit generates drive signals based on the feedback signal to control the current in the fluorescent lamp and outputs the drive signals to the primary transformer winding.

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patent: 5880946 (1999-03-01), Biegel

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