Invention Application
US20170055320A1 SINGLE-STAGE POWER FACTOR CORRECTED LED DRIVER CIRCUIT 有权
单级功率因数校正LED驱动电路

SINGLE-STAGE POWER FACTOR CORRECTED LED DRIVER CIRCUIT
Abstract:
A single-stage power factor corrected light emitting diode (LED) driver circuit having a circuit input node, a circuit output node, and a circuit common node includes a first inductor, a second inductor, a coupling capacitor, a controllable switch, and an LED string. The first inductor is electrically connected in series between the circuit input node and the coupling capacitor, the second inductor is electrically connected in series between the circuit output node and the circuit common node, the coupling capacitor is electrically connected in series between the first inductor and the circuit output node, the controllable switch is electrically connected in series between a first internal circuit node and the circuit common node, the first internal circuit node located between the first inductor and the coupling capacitor, and the LED string is electrically connected in parallel with only the second inductor.
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