Dimmable LED Driver And Method For Controlling The Same
First Claim
1. 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, andan MCU configured to control the buck PFC block, the second buck DC/DC block and the dimming block.
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Accused Products
Abstract
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.
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Citations
19 Claims
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1. 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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for controlling an LED dimmer according to, wherein the method includes the steps of:
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a) initializing a system; b) controlling a duty cycle of a PWM PFC signal of a buck PFC block through an MCU so as to realize a stable output voltage; and c) controlling a second buck DC/DC block through the MCU so as to realize control to output of a constant current, and simultaneously, controlling a dimming block and the second buck DC/DC block through the MCU to realize dimming. - View Dependent Claims (16, 17, 18, 19)
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Specification