The invention discloses a voltage adjustable AC / DC LED drive circuit, which mainly solves the problems of narrow driving range and fixed voltage. The driving circuit includes a power supply are respectively connected with the VCC LED light source, adjustable resistor R1 and adjustable resistor R3 is connected to one end of the adjustable resistor R1 and the resistor R2 is connected to the other end of the end is connected with the adjustable resistor R3 and the resistor R4 is connected to the other end of the cathode and input adjustable resistor R1 and comparator D1 the resistor R2 is connected, and the input cathode comparator D2 adjustable resistor R3 and a resistor R4 connected, diode VD1 is connected with the output of the comparator D1, a diode VD2 is connected with the output of the comparator D2, respectively, and the diode VD1 and a diode VD2 connected, for limiting resistance R5, and base resistance R5 connected with the triode collector and LED the light source tube connected with VT, and the emitter of the triode VT resistor is connected with the R6 pole and the other end of the earth. Through the above scheme, the invention has the advantages of simple structure, universal AC and DC, smooth driving wave and so on.
【技术实现步骤摘要】
实现电压可调的交直流LED驱动电路
本专利技术涉及电力电子
,尤其是实现电压可调的交直流LED驱动电路。
技术介绍
随着科技不断发展,LED作为发光二极管的重要组成部分,因其能耗低、使用寿命长、体积小、成本低廉等优点,被广泛运用于背光源、彩屏和室内外照明三大
目前,市面的LED灯源大多数采用整流电路并由芯片控制,其驱动控制的电压固定,因此,驱动电路仅适用于某一种LED灯源。
技术实现思路
本专利技术的目的在于提供一种实现电压可调的交直流LED驱动电路,主要解决现有技术中存在的驱动范围窄,电压固定等问题。为了实现上述目的,本专利技术采用的技术方案如下:实现电压可调的交直流LED驱动电路,包括分别与电源VCC连接的LED灯源、可调电阻R1和可调电阻R3,一端接可调电阻R1且另一端接地的电阻R2,一端接可调电阻R3且另一端接地的电阻R4,输入正极与可调电阻R1和电阻R2连接的比较器D1,输入负极与可调电阻R3和电阻R4连接的比较器D2,与比较器D1输出连接的二极管VD1,与比较器D2输出连接的二极管VD2,分别与二极管VD1和二极管VD2连接、用于限流的电阻R5,基极与电阻R5连接且集电极与LED灯源连接的三极管VT,以及与三极管VT发射极连接且另一端接地的电阻R6。进一步地,三极管VT为NPN类型。进一步地,比较器D1的输入端负极与比较器D2的输入端正极连接。与现有技术相比,本专利技术具有以下有益效果:本专利技术巧妙地设置两个比较器,通过与电源输入进行比较,获得驱动的高低电平,交直流输入均能适用。而且,在比较器的输入端设置分压可调阻值的电阻,调整比较 ...
【技术保护点】
实现电压可调的交直流LED驱动电路,其特征在于,包括分别与电源VCC连接的LED灯源、可调电阻R1和可调电阻R3,一端接可调电阻R1且另一端接地的电阻R2,一端接可调电阻R3且另一端接地的电阻R4,输入正极与可调电阻R1和电阻R2连接的比较器D1,输入负极与可调电阻R3和电阻R4连接的比较器D2,与比较器D1输出连接的二极管VD1,与比较器D2输出连接的二极管VD2,分别与二极管VD1和二极管VD2连接、用于限流的电阻R5,基极与电阻R5连接且集电极与LED灯源连接的三极管VT,以及与三极管VT发射极连接且另一端接地的电阻R6。
【技术特征摘要】
1.实现电压可调的交直流LED驱动电路,其特征在于,包括分别与电源VCC连接的LED灯源、可调电阻R1和可调电阻R3,一端接可调电阻R1且另一端接地的电阻R2,一端接可调电阻R3且另一端接地的电阻R4,输入正极与可调电阻R1和电阻R2连接的比较器D1,输入负极与可调电阻R3和电阻R4连接的比较器D2,与比较器D1输出连接的二极管VD1,与比较器D2输出连接的二极管VD2,分别与二...
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