| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a current driven toroid-free feedback type ballast, which leads to enhanced reliability of a lamp load and a simplified circuit structure and manufacturing process. <P>SOLUTION: The current driven toroid-free feedback type ballast comprising a filter and rectifier circuit 10, a switch and resonance circuit 20, and the lamp load 30 including capacitors, wherein an output end of the filter and rectifier circuit 10 is coupled to an input end of the switch and resonance circuit 20, an output end of the switch and resonance circuit 20 is coupled to the lamp load 30, and the switch and resonance circuit 20 includes: a trigger circuit composed of resistors R1 and R2, a capacitor C3, a diode D5, and a trigger diode DB3; a half-bridge circuit composed of transistors Q1 and Q2 and a resistor; and a three-winding transformer T composed of a primary winding T3 and two secondary windings T1 and T2. <P>COPYRIGHT: (C)2008,JPO&INPIT |
