LED direct-current input control circuit

Abstract

The invention relates to an LED direct-current input control circuit which comprises an input detecting circuit, a voltage increasing circuit and a voltage decreasing circuit which are connected in sequence and also comprises a feedback circuit. The voltage increasing circuit and the voltage decreasing circuit are used for increasing and decreasing the voltage of an inputted direct-current signaland outputting the voltage to supply power to an LED lamp, and the feedback circuit is connected with the voltage decreasing circuit and is used for controlling the constant voltage and the constant current of an output signal. After detecting that the inputted direct-current signal has overvoltage, the input detecting circuit outputs a first overvoltage shutting-off signal to the voltage increasing circuit so as to directly output the inputted direct-current signal to the voltage decreasing circuit to decrease the voltage and supply power to the LED lamp, and after detecting that the inputted direct-current signal has undervoltage, the input detecting circuit outputs an undervoltage shutting-off signal to the voltage increasing circuit and the voltage decreasing circuit so as to shut offthe voltage increasing circuit and the voltage decreasing circuit and carry out undervoltage protection to the voltage increasing circuit and the voltage decreasing circuit. The LED direct-current input control circuit can realize the direct-current input of low voltage and wide range and has the input undervoltage and overvoltage function, the constant current outputting function and the output overvoltage protection function.

Description

technical field [0001] The present invention relates to an LED control circuit, more specifically, to an LED direct current input control circuit. Background technique [0002] At present, the power supply system used by locomotive lights in coal mines needs to supply power to multiple loads, resulting in a very large voltage change. On the other hand, the locomotive lights used in the coal mining industry to transport coal mines mainly have the following disadvantages: input voltage range is too narrow, light source life is short, light efficiency is low, vibration resistance is poor, maintenance cycle is short, and protection functions are insufficient. It can be used underground for a long time. And, existing locomotive light is often extinguished because of line fault occurring abnormally during use, may cause serious safety accident like this. [0003] Therefore, the locomotive lamp needs to further improve its performance. Contents of the invention [0004] The te...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a DC input LED control circuit for the defects of the above-mentioned narrow input voltage range and insufficient protection function of the existing locomotive lights

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