Linear constant-power and constant-current LED drive circuit
A technology of LED driving and linear constant current, which is applied in the direction of electric lamp circuit layout, electric light source, lighting device, etc., can solve the problems of system input power variation, affecting system efficiency, LED lighting effect, etc., so as to improve light efficiency and avoid adverse effects Effect
Active Publication Date: 2016-03-09
SHENZHEN SUNMOON MICROELECTRONICS
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[0003] The purpose of the present invention is to provide a constant power linear constant current LED drive circuit to solve the problem in the prior art that the change of the input voltage will cause the change of the input power of the entire system, thereby affecting the efficiency of the system and the light effect of the LED lamp.
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[0038] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0039] In order to illustrate the technical solutions of the present invention, specific examples are used below to illustrate.
[0040] The embodiment of the present invention provides a constant power linear constant current LED drive circuit, please refer to image 3 and Figure 4 The constant power linear constant current LED drive circuit includes a rectifier circuit 101, a filter sampling circuit 102, a power control circuit 103, a constant current control circuit 104 and an LED lamp group 105;
[0041] The filter sampling circuit 102 filters and samples the voltage output by the rectifier ...
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The invention relates to the technical field of LED drive circuits, and provides a linear constant-power and constant-current LED drive circuit. The linear constant-power and constant-current LED drive circuit comprises a rectifier circuit, a filtering and sampling circuit, a power control circuit, a constant-current control circuit and an LED lamp bank, wherein the filtering and sampling circuit is used for carrying out filtering and sampling on voltage output by the rectifier circuit and then outputting sampling voltage; the power control circuit is used for obtaining the sampling voltage and comparing the sampling voltage with reference voltage, and adjusting output voltage output to the constant-current control circuit according to the comparison result, so as to adjust output current of the constant-current control circuit to keep input power of the LED lamp bank constant. A change of the sampling voltage is detected through the arrangement of the power control circuit; the sampling voltage is compared with the reference voltage; the magnitude of the output current is adjusted according to the comparison result; and the input power does not change along with the change of the input voltage, so that the luminous efficacy of an LED lamp is improved.
Description
technical field [0001] The invention relates to the technical field of LED drive circuits, in particular to a constant power linear constant current LED drive circuit. Background technique [0002] At present, the linear constant current technology scheme has been widely used in small and medium power LED constant current systems due to its simple system structure. The current common linear constant current schemes, such as figure 1 and figure 2 As shown, it includes a rectifier circuit, a constant current drive circuit and an LED load, and its constant current output is Iout=Vref / Rcs. Compared with the switching power supply solution, the advantage of this application solution is that the system structure is simple and uses fewer components. The disadvantage is that the number of system load LED lights must be designed strictly according to the input voltage. The change of the input voltage will cause the change of the input power of the entire system, thus affecting The...
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Inventor 李照华胡乔林道明赵春波
Owner SHENZHEN SUNMOON MICROELECTRONICS