Light-adjustable high-power LED driving power supply

Abstract

The invention discloses a light-adjustable high-power LED driving power supply, comprising an alternating current input end filter unit, a rectification filter unit, a flyback conversion unit, an auxiliary power supply unit, a single-cycle control unit, a linear optically coupled isolation unit, a constant-current source output end, a constant-current control unit and a PWM (Pulse-Width Modulation) output light adjusting unit. The power supply disclosed by the invention has the advantages as follows: the flyback conversion unit of a main circuit is controlled by the single-cycle control unit;the single-cycle control unit outputs control signal according to output voltage, input current and reference voltage so as to control on and off of a switching tube in the constant-current source output end; therefore, the average value of the output voltage during a switching period is equal to a reference value; the constant-current control unit is provided with an Anti-windup controller whichis capable of effectively preventing integral saturation phenomenon in the control process, so as to keep linear continuity of the controller, keep the output current constant and improve control precision; and the output current is subjected to PWM adjustment so as to continuously adjust light and improve electric energy utilization ratio.

Description

technical field [0001] The invention relates to an LED driving power supply, in particular to a dimmable high-power LED driving power supply. Background technique [0002] With the development of human civilization, lighting equipment has already entered people's daily life. Traditional lighting sources mainly include incandescent lamps, fluorescent lamps, and energy-saving lamps. , high energy consumption, low luminous efficiency, and even some pollution, the development of new lighting sources is the future trend. [0003] As a new type of light source, high-power LEDs have the following main advantages compared with traditional light sources: small size, low power consumption, low heat generation, long life, fast response, safety, and environmental protection. At present, high-power LEDs have not only been successfully used in some Some general occasion lighting, and its special advantages such as high luminous intensity, long service life, green environmental protection...

AI Technical Summary

Problems solved by technology

[0005] The invention mainly aims at the shortcomings of high-power LED circuits such as weak anti-interference ability, poor output stability, low output precision, and low power factor, and provides a dimmable high-power LED drive power supply, which is more stable and efficient

Images