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Circuit for controlling constancy of LED light output and method thereof

A technology of LED light source and light output, which is applied in the field of LED light control, can solve problems such as waste of resources, and achieve the effect of avoiding waste of resources and accurate light output

Active Publication Date: 2014-05-28
INVENTRONICS HANGZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Replacing LED lights at this time is bound to waste resources

Method used

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  • Circuit for controlling constancy of LED light output and method thereof
  • Circuit for controlling constancy of LED light output and method thereof
  • Circuit for controlling constancy of LED light output and method thereof

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Embodiment Construction

[0046] In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0047] The "light output" in the present invention refers to luminous flux, or illuminance, or luminance, or the like.

[0048] see image 3 , which is a structural diagram of the first embodiment of the circuit for controlling the constant light output of LED provided by the present invention.

[0049] The circuit for controlling constant LED light output provided by this embodiment includes: an optical feedback loop 301, a controller 302, a drive circuit 303, a main output LED lamp 304, a reference LED light source 305 and a photoelectric sensor 306;

[0050] The photoelectric sensor 306 is used to measure the light output of the reference LED light source 305, and convert the light output into an electrical signal and send it to th...

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Abstract

The invention provides a circuit for controlling the constancy of an LED light output and a method thereof. An light output of a reference LED light source with a same light attenuation rate or a proportional attenuation rate with a main output LED lamp is collected, the collected light output is converted into an electrical signal, the electrical signal is compared with an electrical signal of a reference light output, thus an output current of a drive circuit is controlled, and the light output of the reference LED light source is adjusted such that the collected electrical signal of the light output is equal to the electrical signal of the reference light output. Since the drive circuit supplies power to the main output LED lamp and the reference LED light source at the same time, thus while adjusting the light output of the reference LED light source, a light output of the LED lamp is adjusted indirectly. The reference LED light source is arranged into a closed space without an influence of an external environment, and the collected light output is accurate. According to the circuit and the method, the constancy of the LED light output of the main output LED lamp can be ensured, and reserving margin for light attenuation additionally is not needed.

Description

technical field [0001] The invention relates to the technical field of LED light control, in particular to a circuit and method for controlling constant light output of LEDs. Background technique [0002] Currently, Light Emitting Diode (LED, Light Emitting Diode) lamps are more and more widely used in the field of lighting due to their advantages of no toxic substances, environmental protection, long service life, and high photoelectric efficiency. [0003] Generally, LED lamps need to be driven by a driving circuit to provide DC power. see figure 1 , which is a working principle diagram of the LED lamp in the prior art. The drive circuit 100 converts electric energy from 220V alternating current (AC220V) to low-voltage direct current, and supplies it to the LED lamp 200 . Although the driving current of the LED lamp 200 is constant, due to the aging effect of the chips and phosphors of the LED lamp 200, the light output of the LED lamp 200 will decrease with time, that ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F21S2/00H05B37/02
Inventor 华桂潮葛良安
Owner INVENTRONICS HANGZHOU
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