A dimmable LED driver adapted to be operated with a dimmer that is configured to generate a predetermined conductive angle, wherein the dimmable LED driver comprises: a rectifier configured to convert an alternating current output by the dimmer to a direct current, a buck PFC block configured to adjust an output voltage of the direct current so as to obtain a stable output voltage, a second buck DC/DC block configured to realize output of a constant current after the stable output voltage is realized, a dimming block configured to, after realizing output of the constant current, accomplish a dimming function jointly with the second buck DC/DC block, and an MCU configured to control the buck PFC block, the second buck DC/DC block and the dimming block.

Claims

19 · 2 independent · depth 6

19 granted claims

›1.independentA dimmable LED driver adapted to be operated with a dimmer that is configured to generate a predetermined conductive angle, wherein the dimmable LED d…+13

›2.↳ 1The dimmable LED driver according to claim 1, wherein the MCU adjusts a duty cycle of a PWM PFC signal that is output according to an error between a …d2+1

›4.↳ 1The dimmable LED driver according to claim 1, wherein the MCU comprises an ADC, a CPU, a PWM PFC unit, a PWM buck unit, a PWM dimming unit and a compa…d2+10

›5.↳ 4The dimmable LED driver according to claim 4, wherein the buck PFC block comprises a first MOSFET, a first MOSFET driver, a first filter inductor, a s…d3+2

›8.↳ 4The dimmable LED driver according to claim 4, wherein the second buck DC/DC block comprises a third diode, a second MOSFET, a second MOSFET driver, a …d3+6

›9.↳ 8The dimmable LED driver according to claim 8, wherein the MCU generates the PWM buck signal to control the second MOSFET to be turned on, a state of t…d4+1

›11.↳ 8The dimmable LED driver according to claim 8, wherein the dimming block comprises the first and second resistors, and the fourth diode, the first and …d4+3

›15.independentA method for controlling an LED dimmer, wherein the method includes the steps of:na) initializing a system;b) controlling a duty cycle of a PWM PFC si…+4

Classifications

10 codes

IPC · International Patent Classification

Section H — Electricity

H05B37/02
H05B33/08

USPC · US Patent Classification

315/307363/23363/21.9363/19315/224363/21.1315/247315/291

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Pendency

2.8 y

1,006 days filing → grant

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none on record

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1 RCE

Examiner

Haiss Philogene

art unit 2844 · TC 2800

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1 priority documents

›Priority documents — 1

Type	Document	Date
related publication	US 20140125240 A1	8 May 2014

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