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Fault detection device for LED driving circuit and detection method thereof

A technology of LED driving and fault detection, applied in the direction of measuring devices, measuring electricity, measuring electrical variables, etc., can solve the problems of LED driving circuit damage and fault expansion, and achieve the effect of preventing fault expansion and convenient and accurate positioning.

Inactive Publication Date: 2010-06-30
SHANGHAI BEILING
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Problems solved by technology

[0002] As we all know, in the driving circuit and its application for multiple groups of LEDs, when one or more groups of LEDs work at the same time, and some LEDs have open circuit or short circuit faults for some reason, if they cannot be detected or cannot be detected in time. If the location of the fault is detected, it may cause the fault to expand, causing damage to more LEDs or the entire LED drive circuit

Method used

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  • Fault detection device for LED driving circuit and detection method thereof
  • Fault detection device for LED driving circuit and detection method thereof

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Embodiment Construction

[0021] Such as figure 1 As shown, the LED driving circuit includes an LED network 3 (such as a plurality of LED strings) and a power supply device 1 (such as an LED power supply) and a driving device 2 (such as an LED constant current driving circuit) respectively connected to the LED network 3 , wherein the LED network 3 includes N groups of LED30, where N is a natural number. One of the present invention, that is, a fault detection device 8 for an LED drive circuit includes a voltage detection module 45 and a logic circuit 6, wherein:

[0022] The voltage detection module 45 is respectively the difference between a detection input signal 31 output from each group of LED30 and a reference voltage signal 31 provided by the driving device 2 and the set value of the external input (this set value can also be determined by the voltage detection module. 45 internally generated) comparison, and output a corresponding identification signal; specifically, the voltage detection modul...

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Abstract

The invention relates to a fault detection device for an LED driving circuit and detection method thereof. The fault detection device comprises a voltage detection module and a logic circuit, wherein the voltage detection module respectively compares a difference value between a detection input signal from each group of LEDs and a reference voltage signal from a driving device and setting values from external input, and outputs an identification signal. The logic circuit performs logical operation on the identification signal output from the voltage detection module and outputs a decision signal. When a group or a plurality of groups of LEDs work, the fault detection device can detect open circuit and / or short circuit faults in real time, and is convenient for users to locate faults accurately and take measures for preventing LED faults from expanding, therefore keeping the LED driving circuit stably working for a long period.

Description

technical field [0001] The invention relates to an integrated circuit, in particular to a fault detection device and a detection method for an LED (light emitting diode) driving circuit. Background technique [0002] As we all know, in the driving circuit and its application for multiple groups of LEDs, when one or more groups of LEDs work at the same time, and some LEDs have open circuit or short circuit faults for some reason, if they cannot be detected or cannot be detected in time. If the location of the fault is detected, the fault may be expanded, causing damage to more LEDs or the entire LED driving circuit. Therefore, in order to avoid this situation and make the LED work stably for a longer period of time, it is necessary to perform real-time fault detection on multiple groups of LEDs in the LED driving circuit. Contents of the invention [0003] In order to solve the above problems, the present invention aims to provide a fault detection device and detection met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02
Inventor 刘传军
Owner SHANGHAI BEILING
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