CN205648102U - Multichannel LED lamp current controlling means - Google Patents

Abstract

The utility model provides a multichannel LED lamp current controlling means, relates to LED lamp current control system. Be equipped with PC control interface, LED lamp obs core control module, LED lamp power of invariablenes current control module, singlechip, communication and digital analog conversion module are established to the obs core control module, power of invariablenes current control module establishes N way LED lamp current constant current control ware. Obs core control module and power of invariablenes current control module pass through interface connection. Thereby the obs core control module was received specific order through communication module and was carried out corresponding order. PC control interface received the current value of the LED lamp of user's setting and calculated out concrete control voltage LED lamp control, core control panel, and single -chip module provides control voltage and exports LED power of invariablenes current control module with the communication of digital analog conversion module, the current value and the bright condition of going out of the outside LED lamp of control voltage that electric current constant current control ware provided according to LED lamp obs core control module and control signal's height level control.

Description

A kind of multi-way LED lamp current control device

Technical field

This utility model relates to LED current control system, especially relates to a kind of multi-way LED lamp current control device.

Background technology

LED is as a kind of novel electric source material, and good, life-span length high with its efficiency, energy-conservation, the photochromic advantages such as many are used quite varied in occasions such as building lighting, Landscape Lighting, public place of entertainment, stage illumination, lighting, video screen and vehicle guidance lightings.The brightness of LED becomes to have non-linear fixing respective function relation with the Mean Forward Current flowing through LED, when the average current flowing through LED increases, the luminosity of LED increases the most therewith, and the luminosity therefore controlling LED is actually the mean forward current controlling to flow through LED.Requirement most basic for lighting source is exactly that brightness to be stablized.Control mode for LED electric current mainly has two kinds at present, and constant voltage drives and constant-current driving.If using constant pressure source as the driving source of LED, the change that voltage source is small will cause the change that forward current is bigger, and therefore drive of constant voltage source cannot meet the normal lighting requirement to light-source brightness stability.

The open a kind of Multichannel LED driving chip output current control device of Chinese patent CN202168244U；Including: multiple-channel output passage；With current data decoding apparatus；Being connected to electric current in the output channel of each road and arrange digiverter, the plurality of digiverter is controlled by current data decoding apparatus.

Summary of the invention

The purpose of this utility model is for the problem such as existing most of LED current control system communication distances are shorter, it is provided that a kind of a kind of multi-way LED lamp current control device improving multi-channel LED lamp current control accuracy.

This utility model is provided with PC and controls interface, LED kernel control module, LED constant current supply control module；

Described LED kernel control module includes one-chip computer module, communication module, D/A converter module；LED constant current supply control module is provided with N paths of LEDs lamp current constant-current controller, and N is 1～24；

LED kernel control module and LED constant current current control module realize the connection of control signal by interface.LED kernel control module receives concrete order by communication module thus performs corresponding order.PC controls interface, by the ethernet communication in communication module, multi-way LED lamp is carried out long-distance control；LED core control panel receives the current value of the LED of user setup, and one-chip computer module and D/A converter module carry out I2C communication and provide high-precision control voltage and export LED constant current current control module to control the electric current of LED；LED kernel control module receives the light on and off situation of the LED of user setup, directly give low and high level to LED constant current current control module to control the duty of LED, LED electric current constant-current controller according to the high accuracy that LED kernel control module is given control the low and high level of voltage and control signal control outside the current value of LED and light on and off situation.

Described one-chip computer module can use the single-chip microcomputer that model is STM32F217ZET that ST Microelectronics produces.

The ethernet communication of described communication module can use the ethernet transceiver that National Semiconductor semiconductor company (NSC) produces, and its concrete model is DP83848C；Serial communication can use single channel RS-232 line driver/receptor that Texas Instruments, Inc produces, and its concrete model is ADM3101E.

Described D/A converter module can use the digital to analog converter that TIX produces, and its concrete model is DAC7578.

The LED current controller that described LED constant current supply control device can use Linear Techn Inc. to produce, its concrete model is LT3954EUHE.

This utility model provides a kind of multi-way LED lamp current control device, develops and designs control interface and be connected with LED current control system, it is achieved PC control to multi-way LED lamp simultaneously；This utility model has redundancy, can realize in theory controlling while 24 paths of LEDs；Use ethernet communication, it is achieved remotely control LED；Using the control algolithm improved, for the load characteristic of LED, control function carries out segment processing, and additional proportion item p peace transposition s on control strategy, the control accuracy of LED electric current reaches 2%；Open serial communication interface, system is easily integrated into all kinds of intelligent illuminating system, and control method is simple.This utility model uses the LED current controller controlled with internal closed loop, decreases Real-time Feedback current value to this link of single-chip microcomputer, improves the response speed of system, and realizes the control of the high accuracy to LED electric current.This utility model can be used for the laboratory research about characteristics such as LED brightness, luminous frequency spectrums, it is applicable to the mixing control of the colourful LED in the public place of entertainment such as the control of tunnel LED lamp brightness, dance hall, bar, road street lighting etc. use, is particularly well-suited to remotely control the occasion of high-powered LED lamp.

Compared with existing LED current control system, the beneficial effects of the utility model are:

This utility model, on the basis of simplifying circuit structure design, uses the long-range control between host computer and LED current control system of the ethernet communication protocol realization；Using the control algolithm improved, the precision that control system controls multi-way LED lamp simultaneously brings up to 2%；Open serial communication interface, it is easier to be integrated in all kinds of Intelligent LED lamp Lighting Control Assembly.

This utility model uses constant-current source to drive LED, meets the requirement of light source stability.This utility model uses ethernet communication, solves conventional serial communication apart from short problem, it is possible to achieve the long-range control of LED；Using the control algolithm improved, on control strategy, additional proportion item p peace transposition s, makes control accuracy reach 2%；Open communications protocol interface, in order to be combined with industry other control system.This utility model control method is simple, it is easy to accomplish, it is adaptable to the application occasions such as the mixing control of the colourful LED in the public places of entertainment such as the control of tunnel LED lamp brightness, dance hall, bar, road street lighting.This utility model can also be used for the laboratory research about characteristics such as LED brightness, luminous frequency spectrums, for the utilization of all kinds of LED controlled current flow.This utility model is readily integrated to all kinds of intelligent lighting system, is particularly well-suited to the control of remote high-powered LED lamp.

Accompanying drawing explanation

Fig. 1 is the circuit composition frame chart of this utility model embodiment.

Figure is respectively labeled as: 1, PC controls interface；2, communication module；3, one-chip computer module；4, D/A converter module；5, LED electric current constant-current controller.

Detailed description of the invention

The utility model is described in further detail with embodiment below in conjunction with the accompanying drawings.

Seeing Fig. 1, this utility model embodiment is provided with PC and controls interface 1, LED kernel control module, LED constant current supply control module 5；Described LED kernel control module includes one-chip computer module 3, communication module 2, D/A converter module 4；LED constant current supply control module 5 is provided with N paths of LEDs lamp current constant-current controller, and N is 1～24.

LED kernel control module and LED constant current current control module 5 realize the connection of control signal by interface.User controls the mode of operation of interface 1 setting control system at PC, and LED kernel control module receives concrete order by communication module 2 thus performs corresponding order.PC controls interface 1, by the ethernet communication in communication module 2, multi-way LED lamp is carried out long-distance control, and the serial communication realization in communication module 2 is integrated with other Intelligent LED lamp control systems；LED core control panel receives the current value of the LED of user setup, calculating concrete control voltage by the control algolithm improved, one-chip computer module 3 and D/A converter module 4 carry out I2C communication and provide high-precision control voltage and export LED constant current current control module 5 to control the electric current of LED；LED kernel control module receives the light on and off situation of the LED of user setup, directly give low and high level to LED constant current current control module to control the duty of LED, LED electric current constant-current controller according to the high accuracy that LED kernel control module is given control the low and high level of voltage and control signal control outside the current value of LED and light on and off situation.

Described one-chip computer module 3 can use the single-chip microcomputer that model is STM32F217ZET that ST Microelectronics produces.

The ethernet communication of described communication module 2 uses the ethernet transceiver that National Semiconductor semiconductor company (NSC) produces, and its concrete model is DP83848C；Serial communication uses single channel RS-232 line driver/receptor that Texas Instruments, Inc produces, and its concrete model is ADM3101E.

The digital to analog converter that described D/A converter module 4 uses TIX to produce, its concrete model is DAC7578.

The LED current controller that described LED constant current supply control device uses Linear Techn Inc. to produce, its concrete model is LT3954EUHE.

PC controls interface 1 by the network interface transmission control command of host computer to LED kernel control module；LED kernel control module and LED constant current current control module are controlled the signal of telecommunication and connect；LED electric current constant-current controller is electrically connected with LED.System is made up of one piece of LED core control panel and polylith LED constant current electric current panel.

PC of the present utility model controls interface 1, and user can click on TCP/IP and carry out setting and the connection of corresponding communications protocol parameter.Communication modes just can control the working condition of LED by PC after having set.User the corresponding order of input can change current value and the duty of each passage in order sends frame；User can also directly the channel current setting area on interface input respective channel current value, click on arrange, toggle switch to ON state, the LED of respective channel will work with corresponding current value.User clicks on next page option, can arrange the parameter of other current controllers of LED.User can change the current value of its work under conditions of LED works.

The single-chip microcomputer that one-chip computer module 3 of the present utility model is used is the single-chip microcomputer that ST Microelectronics produces, and its concrete model is STM32F217ZET.The distinguishing feature of this single-chip microcomputer is high-performance and low-power consumption.Having up to 3 road I2C communications, this utility model can be expanded and control to 24 paths of LEDs lamps simultaneously in theory；Chip carries ethernet module, it is only necessary to external PHY chip just can carry out ethernet communication, it is achieved the message transmission rate of 10M/100Mbit/s；This one-chip computer module 3 mainly includes that electrification reset circuit, crystal oscillating circuit, SW download debugging circuit and EEPROM stores circuit.

The ethernet communication of communication module 2 of the present utility model can use the ethernet transceiver that National Semiconductor semiconductor company (NSC) produces, its concrete model is DP83848C, the ethernet module composition ethernet communication that can carry with single-chip microcomputer, it is achieved the purpose of long-distance control LED；Serial communication can use single channel RS-232 line driver/receptor that Texas Instruments, Inc produces, and its concrete model is ADM3101E, it is simple to be combined with other Industry Control products.

The digital to analog converter that D/A converter module 5 of the present utility model uses TIX to produce, its concrete model is DAC7578.This be a low-power consumption, 12 precision, based on I2C communication, the digital to analog converter of 8 passage DAC outputs.Relation between the digital quantity D that the output voltage V of each passage and single-chip microcomputer give is:

$V=\frac{D}{4096}x5---\left(1\right)$

Current value I when a certain passage of default_aTime, it is effectively equivalent to set the magnitude of voltage of input LED electric current constant-current controller, namely changes the digital quantity D being input to digital to analog converter.

Nucleus module of the present utility model is LED electric current constant-current controller, can use the LED electric current constant-current controller that Linear Techn Inc. produces, and its concrete model is LT3954EUHE.It is a DC-DC controller, as one for driving the core component of the constant current source of high electric current LED, has the function of internal closed loop control to stablize the current value of LED.This control system uses Boost boost topology to drive LED.Single-chip microcomputer can be input to the level of this module by change and reach to control the purpose of LED duty.Under specific mode of operation, the electric current I of this driver drives LED_aWith given magnitude of voltage V there is following relation:

$I_a=\frac{V-100mV}{4R_{LED}}---\left(2\right)$

In formula: R_LEDFor current sampling resistor, resistance is 0.039 Ω.

Can be drawn by formula (1), (2):

$I_a=\frac{5D-409.6}{16384R_{LED}}---\left(3\right)$

From the angle of control algolithm, when the output current value of given one passage of system, being effectively equivalent to control the voltage of this LED electric current constant-current controller given, therefore single-chip microcomputer needs given D/A converter module digital quantity D and given current value I_aBetween relation be:

$D=\frac{16384*I_a*R_{LED}+409.6}{5}---\left(4\right)$

This control system uses the control algolithm improved, the electric current control planning of each passage is carried out 3 Discrete control, and for each piecewise function additional proportion item p peace transposition s, thus reach the high accuracy of multi-channel LED lamp output electric current is controlled, LED current control accuracy is improved to 2%.Control planning is as follows:

$D=px\frac{16384{\mathrm{xI}}_a{\mathrm{xR}}_{LED}+409.6}{5}+s---\left(5\right)$

In formula: the value of p and s is adjusted according to concrete load parameter.

System have employed boost topology circuit based on LT3954EUHE lamp constant-current controller, simplifies circuit design, controls simple, it is achieved that the steady operation of circuit.

Claims (6)

1. a multi-way LED lamp current control device, it is characterised in that be provided with PC and control interface, LED kernel control module, LED constant current supply control module；

Described LED kernel control module includes one-chip computer module, communication module, D/A converter module；LED constant current supply control module is provided with N paths of LEDs lamp current constant-current controller, and N is 1～24；

LED kernel control module and LED constant current current control module realize the connection of control signal by interface；LED kernel control module receives concrete order by communication module thus performs corresponding order；PC controls interface, by the ethernet communication in communication module, multi-way LED lamp carries out long-distance control, and one-chip computer module and D/A converter module carry out I2C communication and be given and control voltage and export LED constant current current control module to control the electric current of LED；LED kernel control module receives the light on and off situation of the LED of user setup, directly give low and high level to LED constant current current control module to control the duty of LED, LED electric current constant-current controller according to the low and high level controlling voltage and control signal that LED kernel control module is given control outside the current value of LED and light on and off situation.

2. a kind of multi-way LED lamp current control device, it is characterised in that described one-chip computer module uses the single-chip microcomputer that model is STM32F217ZET that ST Microelectronics produces.

3. a kind of multi-way LED lamp current control device, it is characterised in that the ethernet communication of described communication module uses the ethernet transceiver that National Semiconductor semiconductor company produces, and its concrete model is DP83848C.

4. a kind of multi-way LED lamp current control device, it is characterised in that serial communication uses single channel RS-232 line driver/receptor that Texas Instruments, Inc produces, and its concrete model is ADM3101E.

5. a kind of multi-way LED lamp current control device, it is characterised in that described D/A converter module uses the digital to analog converter that TIX produces, and its concrete model is DAC7578.

6. a kind of multi-way LED lamp current control device, it is characterised in that the LED current controller that described LED constant current supply control device uses Linear Techn Inc. to produce, its concrete model is LT3954EUHE.