Patent ID: 7098604
Filing Date: 2006-08-29
Classification: F21S,F21V,F21W,H05B,Y02B,Y10S

Abstract:
1. A device for lighting a cold-cathode fluorescent lamp comprising: a direct current power supply unit for providing a low voltage direct current; an auxiliary startup circuit connected to the direct current power unit; and a DC/AC inverter circuit connected to the auxiliary startup circuit, which generates a higher voltage alternating current from the output of the auxiliary startup circuit to light the cold-cathode fluorescent lamp, wherein the auxiliary startup circuit generates across the input terminals of the DC/AC inverter circuit a voltage as about twice as the direct current voltage output from the direct current power supply unit, wherein the auxiliary startup circuit comprises: a first transistor and a second transistor, each having a base, a collector and an emitter, wherein the two emitters are coupled together to one output terminal of the direct circuit power supply unit, the two bases are coupled to another output terminal of the direct circuit power supply unit, the collector of the first transistor is coupled to the ground, and the collector of the second transistor is coupled to the DC/AC inverter circuit; and a first capacitor coupled between the collector of the first transistor and the emitter of the second transistor.