Method and circuit for controlling multi-path current distribution of LED power supply
A technology of LED power supply and current distribution, which is applied in the direction of electric lamp circuit layout, electric light source, light source, etc., can solve the problems of inconsistency and low circuit efficiency, and achieve the effect of improving efficiency, uniform brightness and reducing circuit loss.
Active Publication Date: 2014-03-12
SHENZHEN JINGQUANHUA ELECTRONICS
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[0010] The purpose of the present invention is to provide a LED power supply multi-channel current distribution control method and circuit, aiming to solve the problems of light difference, light decay and low circuit efficiency between LED lamp groups caused by the inconsistency of the existing LED power supply multi-channel current distribution. problems and circuit stability issues caused by existing connections
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[0036] In order to make the object, technical solution and advantages of the present invention more clear and definite, the present invention will be further described in detail below with reference to the accompanying drawings and examples.
[0037] see image 3 The principle schematic diagram of the multi-channel current distribution control circuit of LED power supply provided by Embodiment 1 of the present invention, the multi-channel current distribution control circuit of LED power supply includes AC-DC module 10, LED lamp circuit 40, control module 20 and optocoupler feedback The control circuit 30, the LED lamp circuit 40 also includes: a transformer, a first rectifier module, a second rectifier module, a first LED lamp group, a second LED lamp group, a MOS tube, and a current acquisition module, wherein the transformer The positive pole is connected to the MOS tube; one end of the MOS tube is connected to the first rectification module and the second rectification mod...
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The invention discloses a method and a circuit for controlling multi-path current distribution of an LED power supply. The method comprises the following steps of: S100, presetting a current threshold and an MOS voltage drop threshold; S110, switching on an MOS transistor; S200, detecting the current of each LED lamp group, judging whether a current value which is less than the threshold exists or not, if so, executing S300, and otherwise, executing S400; S300, controlling an AC-DC module to boost the LED lamp groups through an optocoupler feedback control circuit, so that the current values of all the LED lamp groups are more than or equal to the set current threshold; S400, reducing the current of the LED lamp groups of which the current values are more than the set threshold through a control module, so that the current value of each LED lamp group is equal to the preset current threshold; and S500, performing voltage drop detection on the MOS transistor on each LED lamp group through the control module, controlling the AC-DC module to reduce the direct-current output voltage of the MOS transistors of which the voltage drop is more than the set threshold through the optocoupler feedback control circuit, and executing S200. The method can effectively solve the problems of light equation and optical attenuation and greatly improve the efficiency of the circuit.
Description
technical field [0001] The invention relates to a precision control technology for multi-channel current distribution of an LED power supply, in particular to a method and circuit for controlling the multi-channel current distribution of an LED power supply. Background technique [0002] When the existing LED power supply is connected in parallel, the mains is first converted to DC output through AC / DC POWER (AC to DC power supply) as the power supply for LED lights. One of the current circuit design schemes is as follows: figure 1 As shown, this solution is to directly connect multiple sets of LED lamps in parallel at the output end of the AC / DC POWER. This method will lead to inconsistent currents on each group of LED lamp groups due to differences between LED individuals, which will lead to light difference between LED lamp groups and directly affect the effect of LED lights; in addition, it will also cause light decay of LED lights The problem is very serious and direct...
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IPC IPC(8): H02M3/22H05B37/02
Inventor 刘建飞谢春华张立品鞠万金汪兆华孔徐生李战功
Owner SHENZHEN JINGQUANHUA ELECTRONICS