High power LED driving power supply

Abstract

The invention discloses a high power LED driving power supply which comprises an input rectification filter circuit, a power factor correcting circuit, a power conversion circuit, an output rectification filter circuit and a PWM (Pulse-Width Modulation) master control circuit, wherein an electric supply is converted to a direct voltage through the rectification filter circuit, the power factor correcting circuit, the power conversion circuit and the output rectification filter circuit in sequence; and the PWM master control circuit is respectively connected with control ends of the power factor correcting circuit and the power conversion circuit. The driving power supply also comprises a feedback control circuit, an input end of the feedback control circuit is connected with an output end of the output rectification filter circuit, and an output end of the feedback control circuit is connected with the PWM master control circuit. Multipath constant current output of the driving power supply is realized by utilizing a multipath current feedback control circuit, the traditional DC-DC conversion link is replaced, the mutual interference of multipath switching signals can be avoided, the reliability of the driving power supply can be ensured, and the cost of the driving power supply is greatly reduced. The high power LED driving power supply can be widely applied to the field of high power LED illumination.

Description

technical field [0001] The invention relates to an illumination power supply, in particular to a high-power LED power supply. Background technique [0002] In today's environment of global energy shortage, saving energy has become the general trend. High-power LEDs have the advantages of high luminous efficiency, low power consumption, long life, high stability, pure light color, good safety, and strong controllability. They are gradually replacing previous light sources and are widely used in full-color displays, Traffic lights, car lights, background light sources, landscape lighting, special work lighting, etc., have become a new generation of green light sources in the field of lighting. [0003] In order to better utilize the advantages of high-power LEDs, the drive power supply must meet multiple design elements such as constant current output, heat dissipation, efficiency, power factor, overvoltage, overcurrent, and overtemperature protection. Most of the existing h...

AI Technical Summary

Problems solved by technology

Most of the existing high-power LED driving power adopts constant current driving technology. The driving power of hundreds of watts of LEDs on the market adopts the "PFC+LLC+DC-DC" topology, although PF≥0.97 and η≥ can be easily obtained. 88%, but because the switching signals in the multi-channel DC-DC circuit interfere with each other, the circuit is not stable and it is difficult to pass the EMI test, and the cost is high. Therefore, there is an urgent need for a multi-channel switching signal that can avoid mutual interference and high reliability. , low-cost high-power LED constant current drive power supply

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