Patent ID: 7564195
Filing Date: 2009-07-21
Classification: H05B,Y02B

Abstract:
1. A circuit of an electronic ballast with the capability of automatic restart, comprising a rectifier circuit, a trigger circuit of automatic restart, a DC/AC convertor, a output circuit of a lamp, and a circuit of abnormal protection, wherein there is a discharge loop in said trigger circuit, and a trigger recourse Vt is led out from a lamp loop; wherein said rectifier circuit comprises a fuse F, a rectifier BD and a filter capacitor C 1 ; said DC/AC convertor comprises a catching diode D 1 , a transistor Q 1 , a transistor Q 2 , a current limiting resistance R 2 , a current limiting resistance R 3 , a feedback resistance R 4 , a negative feedback resistance R 5 , a dv/dt capacitor C 3 , two secondary side windings Tb and Tc of the oscillating coil T; said trigger circuit of automatic restart comprises a divider resistance R 10 , a rectifier diode D 6 , a divider resistance R 1 , a divider resistance R 6 , a divider capacitor C 8 , a relax diode D 5 , a divider capacitor C 2 , and a diac D 2 ; said output circuit of the lamp comprises a output inductance L 1 , feed-through capacitor C 4 , by-pass capacitor C 6 , a primary side winding Ta of oscillating coil T, a resonant capacitor C 5 , and a thermistor PTC; said circuit of abnormal protection comprises a secondary side winding of the output inductance L 1 , a current limiting resistance R 7 , a rectifier diode D 3 , a delay capacitor C 7 , a relax resistance R 8 , a diac D 4 , and a current limiting resistance R 9 .