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Self-adaptive LED (Light-emitting Diode) light modulator

An LED dimmer and self-adaptive technology, applied in the field of lighting, can solve problems such as bulky, high cost, and stability design challenges, and achieve the effects of small size, energy saving, and intelligent illumination adjustment

Inactive Publication Date: 2012-02-15
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the system is in a closed-loop or partially closed-loop state, the stability design is challenged
There are active dimming device systems for lighting, but they are bulky and costly

Method used

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  • Self-adaptive LED (Light-emitting Diode) light modulator

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Embodiment Construction

[0014] The present invention is described in further detail below in conjunction with accompanying drawing:

[0015] see figure 1 , an adaptive LED dimmer, comprising a power module, a photosensitive module, a boost circuit, a mode selection module, a control module, an LED array, and a multi-channel LED drive circuit; the power module is respectively connected with the photosensitive module, the mode selection module, The boost circuit is connected to the control module in one direction; the boost circuit is bidirectionally connected to multiple LED drive circuits; one end of the LED array is connected to the boost circuit, and the other end is connected to multiple LED drive circuits; the mode selection module is connected to the control The modules are connected in one direction.

[0016] The power supply module provides different power supply voltages to supply power to other modules to ensure the normal operation of the entire system.

[0017] The photosensitive module ...

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Abstract

The invention discloses a self-adaptive LED (Light-emitting Diode) light modulator, which comprises a power source module, a photosensitive module, a boost circuit, a mode selection module, a control module, an LED array and a plurality of LED drive circuits, wherein the power source module is respectively connected with the photosensitive module, the mode selection module, the boost circuit and the control module in a unidirectional way; the boost circuit is connected with the LED drive circuits in a bidirectional way; one end of the LED array is connected with the boost circuit, and the other end of the LED array is connected with the LED drive circuits; and the mode selection module is connected with the control module in a unidirectional way. The invention mainly has the following advantages that: illumination adjustment is intellectualized, and the energy saving advantage of LED illumination is exerted to a greater extent; natural light sources are fully utilized to realize constant illumination output; and a self-adaptive LED light modulating system has a small size and good portability.

Description

Technical field: [0001] The invention belongs to the lighting field, and relates to an active self-adaptive LED dimming device, in particular to an adaptive LED dimmer realized by using a PWM dimming method. Background technique: [0002] The existing linear dimming methods include analog dimming and digital PWM dimming. The analog dimming method mainly utilizes the fixed proportional relationship between the brightness of the LED device and the LED driving current. Its advantages are: when the driving current changes linearly, the influence of the overshoot of the driving current on the LED is relatively reduced, and the control circuit has strong anti-interference . The disadvantage is that the linearity and dimming ratio are not high, and the color temperature is inconsistent. The digital PWM dimming method changes the working time of the LED device through the adjustment of the pulse width, and also changes the output power at the same time, so as to achieve the purpos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02
CPCY02B20/40
Inventor 范世全耿莉高源王胜磊陈雷铖李凤霞
Owner XI AN JIAOTONG UNIV
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