Three-level protection method aiming at different fault characteristics of LED (Light Emitting Diode) power supply

A technology of LED power supply and three-level protection, which is applied in the direction of electric light source, emergency protection circuit device, light source, etc., can solve the problems of short working time without failure, loss, and unobvious improvement of reliability of the power supply, so as to reduce the failure rate and improve Reliability, the effect of reducing the bottleneck effect

Active Publication Date: 2013-12-25
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

The advantage of this type of protection method is that the protection speed is fast, simple and feasible, but the disadvantages are: ① the power supply has a short working time without failure; ② rapid shutdow

Method used

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  • Three-level protection method aiming at different fault characteristics of LED (Light Emitting Diode) power supply
  • Three-level protection method aiming at different fault characteristics of LED (Light Emitting Diode) power supply
  • Three-level protection method aiming at different fault characteristics of LED (Light Emitting Diode) power supply

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Example Embodiment

[0094] If the operating state of the power supply changes and a gradual failure tendency appears, the "second level protection" is entered. This is a fault avoidance method based on component bearing stress adjustment, which is characterized in that this protection method can be used for power failure caused by the gradual change of the stress of key components. This method measures the typical parameters of the power supply and processes the data to determine the fault state and nature of the system. For the gradual (slow) failure trend caused by external stress, through the adjustment of circuit parameters, the excess stress returns and eliminates the hidden danger of failure. The specific implementation includes the following steps:

[0095] ①Status monitoring and management: Using temperature, current / voltage sensor combination, real-time detection of abnormal working status and rate of change.

[0096] ②Information fusion: fusion processing of a sensor array composed of two o

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Abstract

The invention discloses a three-level protection method aiming at different fault characteristics of an LED (Light Emitting Diode) power supply. The three-level protection method comprises the following steps: detecting an operation state of the power supply, shutting down the system through hardware when the state of the power supply changes suddenly, performing stress adjusting secondary protection when a fault changing gradually occurs, namely enabling the power of the power supply to reduce through the reducing speed of a pulse width in a unit time, starting a third-level protection soft-off if the power supply fault tendency is not eliminated after adjusting the stress, then reducing a PWM (Pulse-Width Modulation)pulse width till the width of the PWM pulse is reduced to be 0, and turning off the power supply and shutting down when the output power of the power supply is 0. Through the three-level protection method, three-level protection is mainly applied to the power supply; the emergency faults and the faults gradually changing are processed by using different methods; the faults are avoided by adjusting the stress; the three-level protection method is capable of improving the reliability of the power supply, reducing the fault rate and eliminating or reducing bottleneck effect caused by the power supply in an electronic system.

Description

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Claims

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Application Information

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Owner NORTHWESTERN POLYTECHNICAL UNIV
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