Light-adjustable high-power LED driving power supply
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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.