Patent ID: 7157865
Filing Date: 2007-01-02
Classification: H05B,Y10S

Abstract:
1. A circuit for driving cold cathode fluorescent lamps and external electrode fluorescent lamps comprising: a steady state square wave half bridge oscillator generator to set a running frequency with a high side and low side output; a high side MOSFET and a low side MOSFET to complete the half bridge; a direct current down voltage converter to power the oscillator generator and half bridge; a direct current blocking capacitor; a thermal shutdown feedback circuit to monitor the temperature of one of the high side MOSFET and the low side MOSFET; a channel comprising: a non-inductive or non-capacitive loading lamp detection feedback comprising: a current sensing resistor; a fast recovery diode; a filter; a resistor/capacitor buffer circuit; a voltage comparator; and a latching silicon control rectifier; and a lamp disconnect driver, wherein the power input for the circuit has been cleaned of harmonic noise.