led short circuit protection system

Abstract

The LED short-circuit protection system provided by the present invention includes a power supply module, which is used to supply power to the load LED light source and the circuit, and an execution protection unit, which is used to perform power-off protection for the system when a short-circuit fault occurs to the load LED light source, and a signal acquisition unit. The system is detected by collecting short-circuit signals in real time, and the signal processing unit is used to judge short-circuit faults according to the collection signals of the signal collection unit and to control and execute the protection unit to perform short-circuit protection; the present invention can solve short-circuit problems in the power output LED system For the problem of not being protected, the power supply or control circuit can be locked when the output LED is short-circuited, so as to realize the short-circuit protection of the power supply output multi-channel LED system, and at the same time avoid short-circuit moment, output large current, and instantaneous current shock Wearing circuit components not only protects loads such as LEDs, but also protects the power supply and subsequent circuit parts from damage. The invention has the characteristics of simple circuit, low cost, high reliability, and favorable 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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