Light emitting diode (LED) short-circuit protection system

Abstract

The invention provides a light emitting diode (LED) short-circuit protection system. The LED short-circuit protection system comprises a power module, an execution protection unit, a signal acquisition unit and a signal processing unit, wherein the power module is used for supplying power to a load LED light source and a circuit, the execution protection circuit is used for performing outage protection on the system when a short-circuit fault occurs in the load LED light source, the signal acquisition unit is used for acquiring a short-circuit signal in real time to detect the system, and the signal processing unit is used for judging the short-circuit fault according to the acquisition signal of the signal acquisition unit and controlling the execution protection unit to perform short-circuit protection. By the LED short-circuit protection system, the problem that a power output LED system cannot be protected in short circuit can be solved, a power supply or a control circuit can be locked when an output LED is circuit-shorted, the short-circuit protection of the power output multi-path LED system is achieved, a large current is simultaneously prevented from instantaneously being output in short circuit, a circuit component is prevented from being broken down by an instantaneous current, a load such as the LED is protected, and the power supply and a subsequent circuit part also can be prevented from being damaged. The LED short-circuit protection system has the characteristics of simple circuit, relatively low cost and high reliability and is beneficial for promotion.

Description

technical field [0001] The invention relates to the field of electronics, in particular to an LED short-circuit protection system. Background technique [0002] LED (light emitting diode, light-emitting diode) is called the fourth generation light source, with energy saving, environmental protection, safety, long life, low power consumption, low heat, high brightness, waterproof, miniature, shockproof, easy dimming, concentrated beam, maintenance It is simple and convenient, and can be widely used in various indications, displays, decorations, backlights, general lighting and other fields. LEDs are widely used as lighting sources, but LEDs often have short circuits when they work abnormally. Short-circuit protection needs to be added to the circuit, so as to provide effective protection after the LED is short-circuited and prevent the fault from expanding further. [0003] In the prior art, corresponding researches on LED short-circuit protection have been carried out in Ch...

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Problems solved by technology

[0003] In the prior art, corresponding researches on LED short-circuit protection have been carried out in China to reduce the rigidity caused by such faults. For example, a Chinese patent application with publication number 103001179A discloses an LED lamp and its short-circuit protection circuit. Its main technical solution is to cut off the power circuit of the follow-up LED constant current circuit through the relay when the LED lamp is short-circuited, so as to play the role of short-circuit protection, but the cost of the relay in this technical solution is high and the noise is large

Another example: the Chinese patent application with the publication number of 101959352A discloses an LED drive circuit with LED short-circuit protection. The main technical solution includes the LED short-circuit protection circuit module, and the N -MOS tube, when the LED is short-circuited, it will drive the N-MOS tube to turn off, and then play a role in short-circuit protection, but the disadvantage of this method is that the circuit of the entire technical solution is complicated and the reliability is not high, so a A new LED short-circuit protection device, which can solve the problem that the short-circuit cannot be protected in the power output LED system

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