LED lighting control device

A technology of LED lighting and control devices, applied in lighting devices, energy-saving control technology, lamp circuit layout, etc., can solve the problems of lack of intelligence, poor dimming flexibility, LED output brightness adjustment, etc., to improve comfort and increase power The effect of improving conversion efficiency and using efficiency

Inactive Publication Date: 2011-01-26

HUAZHONG UNIV OF SCI & TECH

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AI-Extracted Technical Summary

Problems solved by technology

[0003] The current LED driver generally adopts the constant current control method, but there are shortcomings of low power conversion efficiency and poor dimming flexibility, so that the energy-saving ...

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Method used

AC/DC conversion module 1 converts mains power to the DC power supply of constant voltage type, realizes circuit is multiple, such as flyback conversion circuit, forward excitation conversion circuit, but its electric energy conversion efficiency is low, and key reason is circuit topological structure There are defects, the present invention preferably realizes the constant voltage output by the LLC half-bridge resonant conversion circuit, as shown...

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Abstract

The invention provides an LED lighting control device which comprises an LED luminaire link, a power supply unit, an environment information collecting unit and an intelligent dimmer unit, wherein the intelligent dimmer unit generates LED dimmer instructions to control the power supply unit to provide power to the LED luminaire link according to environment information. Specifically, the instructions are generated in the following three modes of: mode 1. generating instructions according to user operation information; mode 2. judging whether users exist in a lighting area according to infrared detection information of a human body, and generating instructions according to the judging result; mode 3. carrying out statistic analysis to historical operation information of a user and corresponding area lighting information during operation, inquiring the habitual operation of a user according to the current area lighting information in the statistic analysis result, and thereby generating instructions. The invention fully considers the requirements of a user, provides a diverse and humanized control mode, realizes intelligent dimmer, and improves the electrical energy conversion efficiency for household LED lighting.

Application Domain

Electric light circuit arrangementEnergy saving control techniques

Technology Topic

Electric energyControl mode +5

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Examples

Experimental program(1)

Example Embodiment

[0017] The present invention will be further described in detail below in conjunction with the drawings and embodiments. It should be understood that the specific examples described here are only used to explain the present invention, but not to limit the present invention.

[0018] Reference figure 1 , The present invention includes an AC/DC conversion module 1, a constant current drive module 2, an intelligent dimming unit 3 and an environmental information acquisition unit 4 connected to an external power supply.

[0019] The AC/DC conversion module 1 converts the mains power into a constant-voltage DC power supply, and realizes a variety of circuits, such as a flyback conversion circuit and a forward conversion circuit, but its power conversion efficiency is low. The key reason is that the circuit topology has defects. In the present invention, the LLC half-bridge resonant converter circuit preferably realizes constant voltage output, such as image 3 As shown, the circuit includes two high-voltage switch tubes Q1, Q2, a switch driver DRV, a resonant inductor Lr, a resonant capacitor Cr, a high-frequency transformer T1, two rectifier diodes D1, D2 and a filter capacitor C. The switch tube of the primary side of the LLC half-bridge resonant converter works in the ZVS state, and the rectifier diode of the secondary works in the ZCS state, with low loss and improved overall efficiency.

[0020] The constant current driving module receives the voltage source output by the AC/DC conversion module 1, and controls the output current provided to the LED lamp link according to the LED dimming command from the smart dimming unit. The constant current drive module includes a current controller and a current conversion circuit. The current controller receives the LED dimming command. The LED dimming command carries information about the current required by the LED. The current controller compares the current required by the LED with the current output of the current conversion circuit and adjusts the output voltage of the current conversion circuit. To ensure that the current conversion circuit outputs the constant current required by the LED. In order to achieve high-efficiency power conversion, the current conversion circuit preferably uses a synchronous rectification step-down (BUCK) conversion circuit to achieve constant current output. Refer to the circuit structure figure 2 , Including two switch tubes Q1, Q2, a switch tube driver DRV, a filter inductor L and a filter capacitor C and current detection resistor Rs.

[0021] The environmental information collection unit 4 includes an ambient light intensity detection module, a human body infrared detection module, and a user operation input module. The ambient light intensity detection module detects the natural light intensity in the illuminated area. The human infrared detection module detects the infrared information of the human body to determine whether there is a user in the illuminated area. The detection module consists of corresponding sensors and commonly used signal processing circuits (such as analog-to-digital conversion, Amplification and comparison circuit). The user operation input module provides four operations through two buttons, and the user actively performs the LED on, off, bright and dimming operations. The three types of signals collected by the environmental information collection unit 4 are collected by the programmable logic device and then transmitted to the intelligent dimming unit 3.

[0022] The smart dimming unit 3 generates a dimming command for controlling the LED current and transmits it to the aforementioned current controller. The intelligent dimming unit 3 selects dimming control according to the dimming mode set by the user. There are three basic dimming modes, specifically:

[0023] (1) Manual dimming mode. The LED lamp link is provided with a corresponding dimming button to directly control the LED current size, on and off of the LED lamp link corresponding to the button.

[0024] (2) Human body infrared detection dimming mode. According to the human infrared detection information, it is judged whether there is a user in the lighting area, if there is someone, the current lighting state is maintained, otherwise the LED is kept in the off state.

[0025] (3) Intelligent dimming mode. Specific steps are as follows:

[0026] a) Interval division. After the ambient light intensity signal is converted by an 8-bit AD converter, the output result ranges from 0 to 255, representing the ambient light from the darkest (0) to the brightest (255), which is represented by the letter x. Divide the ambient light signal x into 8 sections on average, represented by the letter k (k=1, 2...8), the range of each section is (32*k-32, 32*k), and the center point is x( k)=32*k-16.

[0027] b) Record data. For each interval k, when the ambient light intensity signal is in this interval, if the user performs a dimming operation and the operation result lasts for a set length of time (such as 15 minutes), the operation is considered valuable and the corresponding operation The dimming current value is written into the data set in this interval. The data set size of the interval can be controlled, and the interval threshold can be set. If the amount of recorded data reaches a certain level (such as 5), the existing records that deviate from the average value of the dimming current are first removed, and then added The dimming current value of the current operation.

[0028] c) Inference calculation. If the amount of recorded data in each interval reaches a certain level, the historical data is used to calculate the average value y(k) of the recorded data in each interval k, otherwise the preset intelligent dimming data is used instead of the historical data The calculated y(k). Typical pre-set smart dimming historical data such as Figure 4 Shown. Then according to the current ambient light signal x, the two nearest intervals n and n+1 are calculated, and the dimming current output calculated by inference is y=(y(n+1)-y(n))/( x(n+1)-x(n))*(xx(n))+y(n), this is the dimming command of the smart dimming output.

[0029] The key to the intelligent dimming mode is to perform statistical analysis on the user's historical operation information and the corresponding regional lighting information during the operation. According to the current regional lighting information, the user's habitual operation is inquired from the regular analysis results, and the corresponding LED dimming instructions are generated. The above smart dimming mode is just an example, and it cannot be regarded as a limitation of the smart dimming mode.

[0030] In actual application, the above three basic modes can be combined, such as using modes (1) and (2) at the same time, or modes (2) and (3).

[0031] There can be multiple LED lamp links, only a separate constant current drive module 2 needs to be configured for each link. The DC power output by the AC/DC conversion module 1 is output to each constant current drive module 2 at the same time to provide each link. The required constant current.

[0032] The intelligent dimming unit 3 can be implemented in a digital signal processor (DSP) together with a current controller. DSP and programmable logic devices are used to realize constant current control and intelligent dimming, and complete tasks that ordinary integrated circuits cannot. At the same time, it can be updated online by modifying the program, which is easy to upgrade and has strong flexibility.

[0033] The above descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement and improvement within the spirit and principle of the present invention shall be included in the protection scope of the present invention. Inside.

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Classification and recommendation of technical efficacy words

Improve comfort
Improve power conversion efficiency

LED lighting control device

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

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Examples

Example Embodiment

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Description & Claims & Application Information

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