Small-size LED power supply
A technology of LED power supply and small size, which is applied in the field of power supply, can solve the problems of not conforming to environmental protection awareness, and achieve the effects of low total harmonic distortion, high power factor, and small shape and volume
Inactive Publication Date: 2015-06-17
XIAN XINWEI INFORMATION TECH
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Problems solved by technology
However, due to the harmful substance mercury contained in the energy-saving lamp tube, it is completely inconsistent with the environmental protection awareness of modern society.
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[0013] Such as figure 1 As shown, a small-volume LED power supply at least includes: a primary rectification circuit 1, a filter circuit 2, an EMC control circuit 3, a step-down constant current LED control circuit 4, and a secondary rectification filter circuit 5. The primary rectification circuit 1 adopts SMD rectifier bridge MB10S, rectifies the AC voltage at the AC input terminal through MB10S to generate a pulsating DC voltage that is twice the root of the input, and filters it into a DC voltage through the filter circuit 2; the filter circuit 2 and the EMC control circuit 3 constitute an integrated circuit, and the filter circuit Circuit 2 and EMC control circuit 3 are composed of capacitors C1 and C2 and L1, R1, and L2. Type filter circuit, in which C1 and C2 use CL21 polyester capacitors, L1 uses a 6*8 size wage inductor, and R1 and L2 use SMD devices. Step-down constant current LED control circuit 4 adopts active power factor correction high-precision step-down LED c...
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The invention relates to a small-size LED power supply. The small-size LED power supply is characterized by at least comprising a primary rectifying circuit, a filtering circuit, an EMC control circuit, a step-down constant current LED control circuit and a secondary rectifying and filtering circuit, wherein an SMT rectifier bridge MB10S is adopted for the primary rectifying circuit, and alternating voltage of an AC input end is rectified through the MB10S to generate pulsating direct voltage output in a twofold radical sign mode and is filtered through the filtering circuit to generate direct voltage; the EMC control circuit constitutes a pi-type filtering circuit through a capacitor C1, a capacitor C2, an L1, an R1 and an L2; an active power factor corrective LED constant current control chip BP2325 is adopted for the step-down constant current LED control circuit. Because the active power factor corrective high-precision step-down LED constant current control chip is adopted, the small-size LED power supply is suitable for full voltage range input, and a high power factor and low total harmonic distortion can be achieved. The power factor can reach 0.9, harmonic distortion is less than 15%, the number of peripheral devices is small, most peripheral devices can be produced by means of SMT devices, the overall size can be made small, and the EMC characteristic is good.
Description
technical field [0001] The invention relates to a power supply, in particular to a small-volume LED power supply. Background technique [0002] Due to the gradual disuse of incandescent lamps by governments of various countries, energy-saving lamps are currently the emerging lamps with the largest market share. However, due to the harmful substance mercury contained in the energy-saving lamp tube, it does not meet the environmental protection awareness of modern society at all. In recent years, with the country's vigorous popularization of LED light sources and the recognition of people from all walks of life, LED's high luminous efficiency, long life, green environmental protection and obvious energy saving and emission reduction effects have been deeply rooted in the hearts of the people. According to incomplete statistics, the main share of LED lamps at this stage is LED fluorescent tubes and LED bulbs, which account for more than 30% and 15% of the market respectively. ...
Claims
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IPC IPC(8): H05B37/02
CPCY02B20/40
Inventor 乔晓涛王水平
Owner XIAN XINWEI INFORMATION TECH