Patent ID: 9055636
Filing Date: 2015-06-09
Classification: H05B,Y02B

Abstract:
1. A light source driving device comprising: a transformer including a primary winding part including first and second external input terminals configured to receive external power from a ballast stabilizer and a coil having an impedance level set to allow the ballast stabilizer to output a normal amount of power, and a secondary winding part electromagnetically coupled to the primary winding part to transform the received external power; a rectifying diode rectifying output power from the secondary winding part of the transformer; a filter having an input terminal and an output terminal outputting light source driving power, configured to deliver rectified power received from the rectifying diode at the input terminal when the rectifying diode is turned on to the output terminal thereof, and storing a partial amount of the rectified power; and an open loop preventing circuit providing a closed loop to the filter such that power stored in the filter is applied to the output terminal when the rectifying diode is turned off.