CN204616169U

CN204616169U - A kind of LED drive power

Info

Publication number: CN204616169U
Application number: CN201520318750.3U
Authority: CN
Inventors: 韩非
Original assignee: CHONGQING XINGLIAN YUNKE SCIENCE & TECHNOLOGY DEVELOPMENT Co Ltd
Current assignee: CHONGQING XINGLIAN YUNKE SCIENCE & TECHNOLOGY DEVELOPMENT Co Ltd
Priority date: 2015-05-18
Filing date: 2015-05-18
Publication date: 2015-09-02
Anticipated expiration: 2025-05-18

Abstract

The LED drive power that the utility model provides comprises: AC power, rectifier bridge, RCD circuit, metal-oxide-semiconductor, transformer, controller, comparator and output filter circuit, and wherein, transformer comprises former limit inductance, secondary inductance and auxiliary induction; Controller controls opening and cut out of metal-oxide-semiconductor by exporting PWM ripple; The D end of metal-oxide-semiconductor is connected with the different name end of transformer primary side inductance, and the S end of metal-oxide-semiconductor is by resistance R4 ground connection; The Same Name of Ends of transformer primary side inductance connects the output of rectifier bridge, and the different name end of transformer secondary inductance connects the anode of LED group by output filter circuit; The in-phase input end of comparator A connects the negative terminal of plant growth lamp, and the output of comparator is connected to controller by optical coupler.The LED drive power that the utility model provides, cascaded transformation circuit is few, and production cost is low, and has higher power factor, can guarantee that LED has preferably light efficiency.

Description

A kind of LED drive power

Technical field

The utility model relates to electronic technology field, particularly relates to a kind of LED drive power.

Background technology

LED drive power is that power supply supply is converted to specific electric current and voltage with the power supply changeover device of driving LED luminescence.

The LED drive power of prior art adopts switch mode constant current source usually, and this power supply needs the multi-stage transformation circuit such as industrial frequency rectifying, power factor correction, high-frequency inversion, high-frequency rectification usually.Therefore, the LED drive power of prior art, on the one hand, because circuit structure is complicated, the high number of required electronic devices and components, cause the reliability of driving power greatly to reduce, and production cost is high.On the other hand, after multi-stage transformation, the efficiency of driving power reduces greatly, and cause the output prograin of power supply low, the light efficiency of LED is poor.

Utility model content

For the above-mentioned defect of prior art, the utility model provides a kind of LED drive power.

The LED drive power that the utility model provides comprises: AC power, rectifier bridge, RCD circuit, metal-oxide-semiconductor, transformer, controller, comparator and output filter circuit;

Described transformer comprises former limit inductance, secondary inductance and auxiliary induction, and described auxiliary induction is used for for controller and comparator auxiliary power supply;

Described controller connects the G end of metal-oxide-semiconductor, and controller controls opening and cut out of metal-oxide-semiconductor by exporting PWM ripple;

The D end of metal-oxide-semiconductor is connected with the different name end of transformer primary side inductance, and the S end of metal-oxide-semiconductor is by resistance R4 ground connection; The Same Name of Ends of transformer primary side inductance connects the output of rectifier bridge, and the different name end of transformer secondary inductance connects the anode of LED group by output filter circuit, described LED group is become by multiple LED strip joint group;

The in-phase input end of comparator A connects the negative terminal of plant growth lamp by resistance R5, the inverting input of comparator A is connected with reference voltage by resistance R6, and the output of comparator is connected to controller by optical coupler.

The LED drive power that the utility model provides comprises: AC power, rectifier bridge, RCD circuit, metal-oxide-semiconductor, transformer, controller, comparator and output filter circuit, wherein, transformer comprises former limit inductance, secondary inductance and auxiliary induction, and auxiliary induction is used for for controller and comparator auxiliary power supply; Controller controls opening and cut out of metal-oxide-semiconductor by exporting PWM ripple; The D end of metal-oxide-semiconductor is connected with the different name end of transformer primary side inductance, and the S end of metal-oxide-semiconductor is by resistance R4 ground connection; The Same Name of Ends of transformer primary side inductance connects the output of rectifier bridge, and the different name end of transformer secondary inductance connects the anode of LED group by output filter circuit; The in-phase input end of comparator A connects the negative terminal of plant growth lamp, and the inverting input of comparator A is connected with reference voltage, and the output of comparator is connected to controller by optical coupler.The LED drive power that the utility model provides, cascaded transformation circuit is few, and production cost is low, and has higher power factor, can guarantee that LED has preferably light efficiency.

Accompanying drawing explanation

The circuit diagram of the LED drive power that Fig. 1 provides for the utility model.

Embodiment

For making the purpose of this utility model, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the utility model embodiment, technical scheme in the utility model is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.

The circuit diagram of the LED drive power that Fig. 1 provides for the utility model.As shown in Figure 1, the LED drive power of the utility model embodiment comprises: AC power AC, rectifier bridge REC, RCD(Residual Current Deve, residual current operated protective device) circuit, metal-oxide-semiconductor K, transformer UC, controller, comparator and output filter circuit; Wherein, transformer UC comprises former limit inductance, secondary inductance and auxiliary induction; auxiliary induction is used for for controller and comparator auxiliary power supply; in the present embodiment; the output of auxiliary induction after diode D3 and electric capacity C3 filtering (VCC) is powered for controller and comparator A, and resistance R2 and R3 shields.RCD circuit comprises electric capacity C1, resistance R1 and diode D1, and output filter circuit comprises diode D2 and electric capacity C2.

Controller connects the G end of metal-oxide-semiconductor, controller is by exporting PWM(Pulse Width Modulation, pulse width modulation) ripple controls opening and closedown of metal-oxide-semiconductor K, concrete, controller, by the duty ratio of control MOS pipe K, adjusts the mean value of the electric current of LED.

The D end of metal-oxide-semiconductor is connected with the different name end of transformer primary side inductance, and the S end of metal-oxide-semiconductor is by resistance R4 ground connection; The Same Name of Ends of transformer primary side inductance connects the output of rectifier bridge, and the different name end of transformer secondary inductance connects the anode of LED group by output filter circuit, wherein, LED group is become by multiple LED strip joint group.

The in-phase input end of comparator A connects the negative terminal of plant growth lamp by resistance R5, the inverting input of comparator A is connected with reference voltage by resistance R6, and the output of comparator is connected to controller by optical coupler.Comparator will export the linear change that a comparison signal removes to control optical coupler, delivers to controller, regulates the duty ratio of pwm signal, thus change the conducting turn-off time of metal-oxide-semiconductor, finally realize the current constant control to LED group through optical coupler coupling.

The LED drive power that the utility model provides has following characteristics:

High reliability: the cascaded transformation circuit that the driving power that the utility model provides adopts is few, and such as, without the need to output filter circuit after rectifier bridge REC, therefore, components and parts used are few, and reliability is high, and efficiency is also high, and production cost is low.

High Power Factor: the driving power that the utility model provides does not need independently circuit of power factor correction, is also easy to power factor is reached very high (more than 0.96 even can reach 0.99).

High efficiency: the driving power that the utility model provides, cascaded transformation circuit is few, and efficiency can reach 95%.

To sum up, the LED drive power that the utility model provides comprises: AC power, rectifier bridge, RCD circuit, metal-oxide-semiconductor, transformer, controller, comparator and output filter circuit, wherein, transformer comprises former limit inductance, secondary inductance and auxiliary induction, and auxiliary induction is used for for controller and comparator auxiliary power supply; Controller controls opening and cut out of metal-oxide-semiconductor by exporting PWM ripple; The D end of metal-oxide-semiconductor is connected with the different name end of transformer primary side inductance, and the S end of metal-oxide-semiconductor is by resistance R4 ground connection; The Same Name of Ends of transformer primary side inductance connects the output of rectifier bridge, and the different name end of transformer secondary inductance connects the anode of LED group by output filter circuit; The in-phase input end of comparator A connects the negative terminal of plant growth lamp, and the inverting input of comparator A is connected with reference voltage, and the output of comparator is connected to controller by optical coupler.The LED drive power that the utility model provides, cascaded transformation circuit is few, and production cost is low, and has higher power factor, can guarantee that LED has preferably light efficiency.

Last it is noted that these are only preferred embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection range of the present utility model.

Claims

1. a LED drive power, is characterized in that, comprising: AC power, rectifier bridge, RCD circuit, metal-oxide-semiconductor, transformer, controller, comparator and output filter circuit;