Patent ID: 6879117
Filing Date: 2005-04-12
Classification: H05B,Y02B,Y10S

Abstract:
1. An electronic ballast for a fluorescent lamp having a power supply, a power supply unit, a DC transformation unit and a lamp driving unit, being characterized in that: the lamp driving unit comprises: a power separator for separating a DC power supplied from the DC transformation unit into a lamp power and a circuit driving power; a constant-voltage unit for making the circuit driving power supplied from the power separator a constant voltage; a switching signal generator that is driven by the power supplied from the constant-voltage unit, for generating a pulse width modulation (PWM) signal corresponding to a capacitance of a lamp connected thereto to drive lamps having different capacitances or a plurality of lamps; a first transformer for inducing the signal outputted from the switching signal generator to a secondary side; first and second field effect transistors T second and third transformers for generating a high voltage corresponding to the switching operation of the first and second field effect transistors T a plurality of bulbs for turning on the lamp (CF lamp) using the high voltage generated by the second and third transformers.