Low-power-consumption LED constant-current driving circuit

Abstract

The invention discloses a low-power-consumption LED constant-current driving circuit which comprises a power input circuit, a constant-current source circuit, an output voltage detection circuit and areference current control circuit. The low-power-consumption LED constant-current driving circuit has the advantage of low power consumption.

Description

technical field [0001] The invention relates to the field of LED drive circuits, in particular to a low-power LED constant current drive circuit. Background technique [0002] An LED is a solid-state semiconductor device that converts electricity directly into light. The inherent characteristics of LED determine that it is the most ideal light source to replace traditional light sources and has a wide range of uses. In addition to meeting the safety requirements, the LED drive circuit should have two other basic functions: one is to maintain the constant current characteristics as much as possible, especially when the power supply voltage changes by ±15%, it should still be able to maintain the output current at ±10%. %; the second is that the drive circuit should keep its own power consumption low, so as to keep the system efficiency of the LED at a high level. However, the existing multi-channel constant current drive circuit for driving multiple LED loads still has the ...

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Problems solved by technology

However, the existing multi-channel constant current drive circuit for driving multiple LED loads still has the problem of a high proportion of its own power consumption, and its own power consumption may even be equal to that of the LED load. A high proportion means that chips packaged by multiple constant current drive circuits will have a problem of high heat generation, so chips packaged by multiple constant current drive circuits are easily damaged; for example, with figure 1 As shown, an existing multi-channel constant current drive circuit has three outputs, and the resistance value of the resistor RUSET' determines the size of each output, wherein the input voltage of the input terminal of the multi-channel constant current drive circuit is 12V , when the output current of each channel is 100mA, and the load voltage of each output terminal is 6V, the input current of the input terminal of the multi-channel constant current drive circuit is 302mA. At this time, the multi-channel constant current drive circuit and each output terminal The total power of the load is 302mA*12V=3.624W, and the total power of each output load is 6V*100mA*3=1.8W, so the power of the multi-channel constant current drive circuit can be obtained as 3.624W-1.8W =1.824W, the ratio of the multi-channel constant current drive circuit to the total power is 50.3%, and the power ratio of the multi-channel constant current drive circuit is high

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