CN203950302U

CN203950302U - A kind of data transmission device for LED electronic blackboard

Info

Publication number: CN203950302U
Application number: CN201420272611.7U
Authority: CN
Inventors: 赵领航; 王自强; 钟琴
Original assignee: ZHEJIANG WANGUO ELECTRONIC TECHNOLOGY Co Ltd
Current assignee: ZHEJIANG WANGUO ELECTRONIC TECHNOLOGY Co Ltd
Priority date: 2014-05-26
Filing date: 2014-05-26
Publication date: 2014-11-19
Anticipated expiration: 2024-05-26

Abstract

The utility model discloses a kind of data transmission device for LED electronic blackboard, comprise signal conditioning circuit, A/D change-over circuit, fpga chip, storer, pci interface adapter circuit, clock module and power supply, from the simulating signal of external world's input, first through signal conditioning circuit, nurse one's health, then be input to A/D change-over circuit, simulating signal is converted to data-signal, then enter fpga chip and carry out data buffering, finally store in storer, pci interface adapter circuit one end is connected with fpga chip, the other end connects pci interface, the data that are stored in storer are finally transferred on LED electronic blackboard by pci interface adapter circuit and pci interface, realize electronic blackboard DMA high-speed transfer, whole apparatus structure is simple, cost is low, can be by extraneous simulated data fast, be transferred on LED electronic blackboard to flow process.

Description

A kind of data transmission device for LED electronic blackboard

Technical field

The utility model relates to a kind of data transmission device for LED electronic blackboard, belongs to LED technical field.

Background technology

At present, the interactive electronic blackboard that the LED of take screen or liquid crystal display are display device is owing to no longer needing projector to enter people's sight line, the interactive electronic blackboard that on market, existing employing liquid crystal display is display device, TFT liquid crystal display has outstanding color saturation, the contrast of reducing power and Geng Gao, under solar radiation, picture is still clear, but shortcoming is comparison power consumption, and cost is also higher.

LED display is arranged the display device forms by light emitting diode, its employing low-voltage turntable driving, the advantage such as have little power consumption, long service life, cost is low, brightness is high, fault is few, visual angle is large, visual range is far away.Compare with LCDs, LED display, at aspects such as brightness, power consumption, visible angle and refresh rates, all has more advantage.If adopt LED screen as the display device of electronic blackboard, because the LED in the region without writing is in closed condition, so power consumption can also further reduce.

At present, on market, not yet there is take the interactive electronic blackboard that LED screen is display device, but along with the design production technology of full-color large scale high density LED screen reaches its maturity, the cost of full-color large scale high density LED screen significantly reduces that (every square less than 10,000 yuan, and thereupon output increase also at further fast-descending), the advantage with LED screen in cost, display performance and power consumption will promote to take the fast development of the interactive electronic blackboard that LED screen is display device.

Teacher can be shielded and be shown the content of courses by LED easily, and the content of courses has two classes: the one, and teacher's writing on the blackboard; The 2nd, the courseware that computing machine presents, picture or other multi-medium datas, it is exported by relevant interface.Find at present the defects such as multi-medium data is when being transferred to LED screen and showing, ubiquity data rate is slow, not smooth.

In view of this, the inventor studies this, develops specially a kind of data transmission device for LED electronic blackboard, and this case produces thus.

Utility model content

The purpose of this utility model is to provide a kind of data transmission device for LED electronic blackboard, on the basis of input signal conditioning, by high-speed, high precision A/D change-over circuit, fpga chip, high-speed high capacity memory module and the data transmission interface based on pci bus, realize electronic blackboard DMA high-speed transfer.

To achieve these goals, solution of the present utility model is:

A kind of data transmission device for LED electronic blackboard, comprise signal conditioning circuit, A/D change-over circuit, fpga chip, storer, pci interface adapter circuit, clock module and power supply, from the simulating signal of external world's input, first through signal conditioning circuit, nurse one's health, then be input to A/D change-over circuit, simulating signal is converted to data-signal, then enter fpga chip and carry out data buffering, finally store in storer, pci interface adapter circuit one end is connected with fpga chip, the other end connects pci interface, the data that are stored in storer are finally transferred on LED electronic blackboard by pci interface adapter circuit and pci interface, clock module is connected with A/D change-over circuit, fpga chip and pci interface adapter circuit respectively, and for it provides clock signal, power supply is respectively signal conditioning circuit, A/D change-over circuit, fpga chip and the power supply of pci interface adapter circuit, above-mentioned A/D change-over circuit is selected the high-speed AD converter that model is AD9430.

As preferably, above-mentioned storer adopts the DDR storage chip that data transfer rate is 200M ~ 400M.

As preferably, above-mentioned fpga chip adopts the fpga chip of Cyclone II series.

The above-mentioned data transmission device for LED electronic blackboard, first by signal conditioning circuit, input signal is nursed one's health, then by high-speed, high precision A/D change-over circuit, fpga chip, high-speed high capacity memory module and the pci interface adapter circuit based on pci bus, realize electronic blackboard DMA high-speed transfer, whole apparatus structure is simple, cost is low, can be by extraneous simulated data fast, be transferred on LED electronic blackboard to flow process.

Below in conjunction with drawings and the specific embodiments, the utility model is described in further detail.

Accompanying drawing explanation

Fig. 1 is the data transmission device structured flowchart of the present embodiment;

Fig. 2 is the data transmission device fpga chip internal logic block diagram of the present embodiment;

Fig. 3 is the signal conditioning circuit schematic diagram of the present embodiment.

Embodiment

As shown in Figure 1, a kind of data transmission device for LED electronic blackboard, comprise signal conditioning circuit 1, A/D change-over circuit 2, fpga chip 3, storer 7, pci interface adapter circuit 4, clock module 5 and power supply 6, from the simulating signal of external world's input, first through signal conditioning circuit 1, nurse one's health, then be input to A/D change-over circuit 2, simulating signal is converted to data-signal, then enter fpga chip 3 and carry out data buffering, finally store in storer 7, pci interface adapter circuit 4 one end are connected with fpga chip 3, the other end connects pci interface 8, the data that are stored in storer 7 are finally transferred on LED electronic blackboard by pci interface adapter circuit 4 and pci interface 8, clock module 5 is connected with A/D change-over circuit 1, fpga chip 3 and pci interface adapter circuit 4 respectively, and for it provides clock signal, power supply 6 is respectively signal conditioning circuit 1, A/D change-over circuit 2, fpga chip 3 and 4 power supplies of pci interface adapter circuit.In the present embodiment, the Cyclone II family chip that the concrete employing model of fpga chip 3 is EP2C5Q208C8, interior data transmitting procedure is as shown in Figure 2.

The effect of signal conditioning circuit 1, in high-speed a/d converter application, because input signal coupling scheme are different, the features such as dynamic range is larger, if improve the precision of data acquisition, need to make full use of the input range of A/D conversion chip, the voltage of input signal is excessive may damage A/D conversion chip, the too small resolution that can not make full use of A/D conversion chip, so must nurse one's health the simulating signal of input, to reach A/D conversion chip to being sampled the requirement of signal voltage, during signal conditioning circuit design, need consider to obtain from the external world ability of signal, adaptive faculty to range of signal, and to inhibition of noise etc., in the present embodiment, described signal conditioning circuit 1 adopts the chip that model is AD828, as shown in Figure 3.AD828 is voltage feedback operational amplifier, can be used as outstanding gain stage (G >+2) or active filter for high-speed video system.

A/D change-over circuit 2 is keys of whole data transmission device, select which type of A/D conversion chip to be related to the technical indicator of data data transmission device, system architecture, system power supply, the factors such as environmental requirement, data transmission device described in the utility model is from A/D change-over circuit 2 output interfaces, what A/D change-over circuit 2 sampled datas are adopted due to rear end is fpga chip, dirigibility is larger, the level standard of supporting is also many, the A/D conversion chip of the present embodiment adopts the high-speed AD converter AD9430 of ADI company, sampling clock reaches as high as 210MSa/s, 12 of resolution, support difference input voltage, scope is-768mV～+ 768mV.Rear end adopts LVDS differential level output data, can realize very easily and being connected of fpga chip.

In the present embodiment, described storer 7 adopts speed, DDR SDRAM storage chip that capacity is huge.The data transfer rate of DDR storer, can reach 200M ~ 400M, with respect to the sampling rate of A/D change-over circuit 200Sa/s, can realize real-time storage.

Clock module 5 will be exported a high-precision clock in road to A/D change-over circuit 2, another road supply fpga chip 3 and pci interface adapter circuit 4 are as local bus clock, the clock of supplying with pci interface adapter circuit 4 and FPGA is not very high to accuracy requirement, can directly with the output of crystal oscillator, drive, but supply with the clock of A/D change-over circuit, but its serviceability is produced to directly impact.Concerning an actual A/D change-over circuit, the amplitude of sampling clock and phase place are usually by outside noise source interference, these interference sources can be accompany noise, power supply noises of random noise, the oscillator in broadband, or due to bad wiring, decoupling and earthing method causes improperly digital noise.

Provide ± 5V of signal conditioning circuit 1 voltage is provided power supply 6, is provide+3.3V of fpga chip 3 ,+1.25V voltage, is provide+3.3V of A/D change-over circuit 2 voltage, is provide+3.3V of pci interface adapter circuit 4 voltage.

Above-described embodiment and graphic and non-limiting product form of the present utility model and style, suitable variation or modification that any person of an ordinary skill in the technical field does it, all should be considered as not departing from patent category of the present utility model.

Claims

1. the data transmission device for LED electronic blackboard, it is characterized in that: comprise signal conditioning circuit, A/D change-over circuit, fpga chip, storer, pci interface adapter circuit, clock module and power supply, from the simulating signal of external world's input, first through signal conditioning circuit, nurse one's health, then be input to A/D change-over circuit, simulating signal is converted to data-signal, then enter fpga chip and carry out data buffering, finally store in storer, pci interface adapter circuit one end is connected with fpga chip, the other end connects pci interface, the data that are stored in storer are finally transferred on LED electronic blackboard by pci interface adapter circuit and pci interface, clock module is connected with A/D change-over circuit, fpga chip and pci interface adapter circuit respectively, and for it provides clock signal, power supply is respectively signal conditioning circuit, A/D change-over circuit, fpga chip and the power supply of pci interface adapter circuit, above-mentioned A/D change-over circuit is selected the high-speed AD converter that model is AD9430.

2. a kind of data transmission device for LED electronic blackboard as claimed in claim 1, is characterized in that: described storer adopts the DDR SDRAM storage chip that data transfer rate is 200M ~ 400M.

3. a kind of data transmission device for LED electronic blackboard as claimed in claim 1, is characterized in that: described fpga chip adopts the fpga chip of Cyclone II series.