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Failure detection circuit and detection method for light emitting diode (LED)

A technology of light-emitting diodes and detection circuits, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc.

Active Publication Date: 2013-05-01
上海澳星照明电器制造有限公司
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Problems solved by technology

[0007] The present invention aims at the problem that the existing failure detection technology of LEDs can only detect the number of failures of LEDs in a short-circuit state, and provides a LED failure detection circuit and a detection method implemented based on the detection circuit

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  • Failure detection circuit and detection method for light emitting diode (LED)

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Embodiment Construction

[0026] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

[0027] see figure 1 The light emitting diode failure detection circuit 100 provided by the present invention can perform online detection and fault information prompts when the light emitting diodes in the light emitting diode array are randomly in two failure states of open circuit or short circuit during operation.

[0028] As can be seen from the figure, the LED array targeted by the detection circuit 100 is formed by a plurality of LED strings 200 connected in parallel, and each LED string 200 is formed by a plurality of LEDs 201 connected in series. For the convenience of subsequent description, the light emitting diode array is represented by an LED array, the light emitting diode string 200 is represented by an LED string 200 , and the li...

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Abstract

The invention discloses a failure detection circuit and a detection method for a light emitting diode (LED). A plurality of voltage-stabilizing diodes in the detection circuit are respectively connected in parallel to two ends of each LED in an LED array; a constant-voltage power supply supplies power to the LED array; and a constant-current control circuit is in control connection with two ends of each LED string in the LED array and is used for detecting voltage drop of each LED in each LED string in real time. The detection method comprises the following steps of: firstly, detecting the work state of each LED in each LED string in the LED array in real time by the detection circuit; secondly, allowing voltage values at two ends of a collector electrode and a transmitting electrode on a triode in the detection circuit to change along with the change of failure conditions of each LED in each LED string; and thirdly, determining the failure state of the LED by detecting change conditions of the voltage values of two ends of the collector electrode and the transmitting electrode on the triode. According to the failure detection circuit and the detection method disclosed by the invention, online detection and fault information prompt required by the fact that the LED in the LED array is randomly positioned in two failure states of open circuit or short circuit in normal work process can be realized.

Description

technical field [0001] The invention relates to a light-emitting diode circuit technology, in particular to a technology for detecting failure of a light-emitting diode. Background technique [0002] With the rapid development of semiconductor technology, light-emitting diodes (LEDs) have been widely used in products such as lighting, light-emitting displays and indications. [0003] Due to the characteristics of light-emitting diodes, they are generally arranged in arrays when they are used, so as to achieve good use effects. Specific such as road lights, various advertising signs and so on. [0004] Due to long-term use, some light-emitting diodes in the light-emitting diode array may fail to work, which affects the use effect of the entire light-emitting diode array. In the past, the only way to solve this situation is to replace the LED array as a whole, which will greatly increase the cost. [0005] Therefore, the failure detection and fault information prompting of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02
Inventor 周俊曹金韡陈嘉诚
Owner 上海澳星照明电器制造有限公司
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