Patent ID: 8664879
Filing Date: 2014-03-04
Classification: H05B

Abstract:
1. A circuit for driving a fluorescent lamp and a light-emitting diode, the circuit comprising: an inverter; a fluorescent lamp driving branch for driving a fluorescent lamp, connected to an output end of the inverter, and including a first inductor, a first capacitor, a second capacitor, and an MOSFET transistor that are connected in series; a light-emitting diode driving branch for driving a light-emitting diode, connected to the output end of the inverter; a starting branch comprising a first resistor, a third capacitor, a first diode and a DIAC, wherein one end of the first resistor is connected to a power source and another end thereof is connected to one end of the third capacitor, the another end of the third capacitor is grounded; the first diode is connected between a node between the first resistor and the third capacitor and a midpoint between an upper switch and a lower switch of the inverter; and the DIAC is connected between a node between the first resistor and the third capacitor and a control electrode of the lower switch; and an alternate control branch comprising second to sixth resistors, a fourth capacitor, first and second clamping diodes, a thyristor and the MOSFET transistor, wherein the second resistor and the third resistor are connected in series between the power source and the ground; the fourth capacitor is connected in parallel with the third resistor, and a non-grounded end of the fourth capacitor is connected to a gate of the thyristor via the first clamping diode and the fourth resistor; an anode of the thyristor is connected to a node between the fifth resistor and the sixth resistor that are connected in parallel with the third capacitor, and a cathode thereof is connected to the ground; and an end of the fourth resistor that is connected to the thyristor is further connected to the control electrode of the MOSFET transistor and is connected to the ground via the second clamping diode.