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Online detection circuit for detecting fault of serial light-emitting diode light source

A technology of light-emitting diodes and detection circuits, which is applied in the direction of light source, electric light source, electric lamp circuit layout, etc., and can solve the problem that there is no online detection circuit of series light-emitting diodes.

Inactive Publication Date: 2015-12-09
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0007] Through the search, no online detection circuit related to similar series LED light source faults was found

Method used

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  • Online detection circuit for detecting fault of serial light-emitting diode light source

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Embodiment Construction

[0018] The invention according to figure 1 The structure shown is implemented, wherein: the power supply of the light source under test on the left + V1 is a constant current source or voltage source designed according to the requirements of different LED light sources;

[0019] Current limiting resistor R2, branch current limiting resistor (R a ~R n ) 7 Select the resistance value and power according to the power consumption requirements in the circuit;

[0020] The semiconductor light-emitting diode LED (D a ~D n )3 Lighting requirements for the light source used, choose visible or infrared or laser light-emitting diodes;

[0021] Connector seat 4 and connector head 5 can be a pair of connectors in the form of seat holes and header pins according to requirements;

[0022] The connecting cable 6 is a universal cable;

[0023] Light-emitting diodes (D testa ~D testn ) 8 select general-purpose visible light-emitting diodes.

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Abstract

The invention provides an online detection circuit for detecting a fault of a serial light-emitting diode light source and belongs to the online detection circuit related in the technical field of light-emitting diode light sources. According to the technical scheme, the online detection circuit comprises a detected LED light source and a detection circuit; a power supply +V of the detected LED light source is connected with one end of a current limiting resistor R, and the other end of the current limiting resistor R is connected with detected serial LEDs (Da-Dn); the detected serial LEDs (Da-Dn) are connected with pins of test connector seats in one-to-one correspondence through lead-out wires which connect each two LEDs, and the test connector seats are connected with connector heads in the detection circuit in one-to-one correspondence; the connector heads are connected with connection cables, the connection cables are connected with branch current limiting resistors (Ra-Rn), and the branch current limiting resistors (Ra-Rn) are connected with serial visible-light light-emitting diodes (Dtesta-Dtestn). The online detection circuit is suitable for online detection when short-current and open-circuit faults happen to various kinds of LED light sources which are connected in series.

Description

technical field [0001] The invention belongs to the technical field of semiconductor light-emitting diode (LED) light sources and relates to an on-line detection circuit for faults of LED light sources connected in series. Background technique [0002] Due to the characteristics of energy saving, long life, small size, and high brightness, semiconductor light-emitting diodes are widely used in lighting, signal lights, displays, or as special light sources in the fields of science and technology and industry. In order to increase the luminous intensity, usually the light source is combined with multiple LEDs. [0003] In order to make the structure of the light source circuit simple and the cost low, a plurality of LEDs in the light source circuit are connected in series in many cases. Although this method of connection is simple, if one or a few of the LEDs fail, it may cause the LEDs in the entire series link to be unlit or destroyed. [0004] The failure modes of LEDs ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/03
Inventor 龙科慧乔克周磊左洋
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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