Driving device of LED tube
A technology of LED lamp tubes and driving devices, which is applied in the direction of lighting devices, lamp circuit layout, light sources, etc., can solve the problems of high manufacturing cost, high electromagnetic noise, and defects, and achieve the effect of reducing design costs and reducing the ratio of defects
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[0021] see figure 2As shown, the present invention includes AC-DC converter 21, LED lamp tube 23, constant current control circuit 27, protection circuit 28, control circuit 251 and dimming circuit 29; The power supply Vac is connected, and the output terminal outputs the first DC voltage Vd1; the LED lamp tube 23 includes n parallel connected LED lamp strings 231-23n, each LED lamp string has an input terminal and an output terminal P1-Pn, and each LED lamp string The input terminals 231-23n are coupled to the output terminal of the first DC voltage Vd1 of the AC-DC converter 21; the constant current control circuit 27 is coupled to the output terminals P1-Pn of each LED light string 231-23n to control each Whether the LED light strings 231-23n work normally or not, and control the current flowing through each LED light string 231-23n to be constant; the protection circuit 28 is coupled to the output of each LED light string 231-23n Terminals P1-Pn can output a protection s...
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