Circuit of non-isolated multi-channel intelligent power supply with high PF value

Abstract

The invention discloses a circuit of a non-isolated multi-channel intelligent power supply with a high PF value; the circuit comprises a power supply circuit and n colored light circuits with the same structure, n is greater than or equal to 2, the positive input terminal and the negative input terminal of each colored light circuit are respectively connected with the positive output terminal and the negative output terminal of the power supply circuit, the power supply circuit comprises a diode rectifier module and a main circuit capacitor; each colored light circuit comprises an isolation diode, a branch capacitor, an LED lamp group and a non-isolation step-down constant-current circuit, the non-isolation step-down constant-current circuit can perform constant-current dimming on the LED lamp group, the isolation diode can prevent working high-frequency clutter reverse crosstalk, and the branch capacitor plays a role in absorbing noise of each colored light circuit; aiming at medium and high power intelligent lamps, a high PF value can be achieved, international standards such as Europe and America can be completely met, the energy utilization rate of a mains supply power grid is greatly improved, the cost is reduced, the competitiveness of products is improved, and good market application value is achieved.

Description

technical field [0001] The invention relates to the field of LED intelligent power supply, in particular to a circuit of high PF value non-isolated multi-channel intelligent power supply. Background technique [0002] LED intelligent power supply refers to the power supply that uses infrared remote control, mobile phone app, mechanical switch, etc. to control the functions of LED lamp dimming, color adjustment, and shutdown. At present, the existing intelligent LED lamps have multiple color lights, and there are the following two circuit implementation methods for large, medium and small power : [0003] 1. Use isolation plus secondary shunt control, please refer to figure 2 In this way, the utilization rate of the power grid is high, but the conversion efficiency η of the isolated power supply is low, the heat generation is large, the power loss of the primary and secondary circuits is large, there are many circuit components, and the cost is high. Among them, the isolated...

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Problems solved by technology

[0003] 1. Use isolation plus secondary shunt control, please refer to figure 2 In this way, the utilization rate of the power grid is high, but the conversion efficiency η of the isolated power supply is low, the heat generation is large, the power loss of the primary and secondary circuits is large, there are many circuit components, and the cost is high. Among them, the isolated power supply refers to the commercial power supply and the LED. The lamp beads are isolated by high-voltage transformers, and work on two different windings of the transformer, electrically insulated from the mains;

[0004] 2. For the method of using low power and low PF non-isolated multi-channel power supply, please refer to image 3 Among them, non-isolation means that the mains and LED lamp beads are not isolated by high voltage transformer, and work on the same winding of the transformer. The electricity and the mains are not insulated. Small heat, few circuit components, low cost, but low PF value of power grid utilization, especially for medium and high power LED lamps with P>25W. Energy utilization, this existing circuit architecture, non-isolated multi-channel intelligent power supply, because there is serious switching frequency interference between multi-channel control at the same time, it is necessary to add a large electrolytic capacitor filter to the main circuit of the rectifier power supply, a large electrolytic capacitor Capacitors increase the capacitive load of the circuit, making the PF value only about 0.6, which can only be applied to low-power lamps with P=25W, which are far below the international requirements of Europe and the United States for PF values> 0.9 standard

[0005] For this reason, for medium and high-power LED smart lamps with P>25W, mainstream LED lamp manufacturers can only use the first type of isolated power supply to achieve high PF value. Such high cost and serious heat generation bring great design difficulty and terminal Price pressure

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