H - Electricity – 05 – B
Patent
H - Electricity
05
B
H05B 41/14 (2006.01) H05B 41/19 (2006.01)
Patent
CA 2607733
A current driven toroid-free feedback type ballast comprising a filter and rectifier circuit, a switch and resonant circuit and a lamp load including capacitors, wherein the filter and rectifier circuit is coupled to input ends of the switch and resonant circuit with its output ends; the switch and resonant circuit is coupled to the lamp load with its output ends and comprising: a trigger circuit comprised of resistors R1, R2, a capacitor C3, a diode D5 and a trigger diode DB3; a half bridge circuit comprised of transistors Q1, Q2 and resistors; and a three winding transformer T comprised of primary winding T3 and two secondary windings T1, T2. In the current driven toroid-free feedback type ballast of the present invention, the switch and resonant circuit employs a half bridge circuit of transistors together with the transformer to effect driving feedback such that the ballast possess the advantage of toroid- free, which leads to enhanced liability of the lamp load, simplified circuit configuration and manufacturing process whereby to facilitate the miniaturization of electronic ballasts.
Mass Technology (h.k.) Ltd.
Nelligan O'brien Payne Llp
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