CN202404875U

CN202404875U - Light-emitting diode (LED) signal drive control system

Info

Publication number: CN202404875U
Application number: CN2012200132098U
Authority: CN
Inventors: 李照华; 杨亚吉; 石磊; 符传汇; 陈克勇; 林道明
Original assignee: Shenzhen Mingwei Electronic Co Ltd
Current assignee: Shenzhen Mingwei Electronic Co Ltd
Priority date: 2012-01-12
Filing date: 2012-01-12
Publication date: 2012-08-29
Anticipated expiration: 2022-01-12

Abstract

The utility model provides an light-emitting diode (LED) signal drive control system which is composed of a system controller, a differential signal converting to transistor-transistor logic (TTL) level module, a TTL level drive amplifying module and an LED display device, wherein differential signals output by the system controller enter the differential signal converting to TTL level module which converts the differential signals to a TTL level and inputs the TTL level to the TTL level drive amplifying module, the TTL level is amplified by the TTL level drive amplifying module and input to the LED display device, and the TTL level drive amplifying module is an integrated circuit module. According to the above scheme of the LED signal drive control system, drive capacity and receiving of high-frequency signals are greatly improved by utilizing the improved drive module; the circuit is simple in structure, the cost is low, uncertain factors by using discrete devices for constructing an amplifying circuit are avoided, and the LED signal drive control system is particularly applicable to signal drive of LED systems in serial or parallel connection.

Description

LED signal driving control system

Technical field

The utility model relates to the electronic circuit technology field, and particularly, the utility model relates to LED signal driving control system.

Background technology

At present; Most of decorative chain led chip all is based on the signal series connection transmission mode of single two-wire on the market; Just transmit the data of LED chip for driving with line (data line and clock line), thereby change the change color of red, green and blue LED lamp with one or two.If all LED chip for driving all are connected in series; The LED chip for driving of front one-level can be the data of back through shaping one-level transmission backward after receiving data; So having only the LED chip for driving of the first order is to be connected with the signal end of system controller, as shown in Figure 1.

Series connection transmission is general all at the Transistor-Transistor Logic level of 3.3V～5V to the level specification of input signal; The signal output part of system controller drives first order LED chip for driving by 74HC245 output Transistor-Transistor Logic level, so traditional series LED chip for driving is less demanding to the driving of signal, is easy to realize; But the LED chip for driving of series connection has a shortcoming; When some chips have wherein been broken cisco unity malfunction, signal just transmission not to all LED chip for driving of back, cause occurring a sheet of bad point.

In order to solve traditional series LED chip for driving shortcoming, adopt parallel connection LED chip for driving or single-chip microcomputer scheme in the industry, all parallel connection LED chip for driving or single-chip microcomputer are shared one or two bars buses, and be as shown in Figure 2.Each LED chip for driving or single-chip microcomputer all have a unique address to come on the intercepting bus corresponding data to come the driving LED lamp.If take the signal of traditional 5VTTL level as bus; The LED chip for driving of parallel connection or the quantity of single-chip microcomputer are very limited; Because the 5V Transistor-Transistor Logic level can reduce along with the quantity of LED chip for driving or single-chip microcomputer; Add the inductance parasitic on the upper conductor and the influence of electric capacity and cause distortion in the signals transmission, cause the LED chip for driving or the single-chip microcomputer cisco unity malfunction of part parallel connection.

In order to solve the difficult problem of this parallel connection LED drive signal technical field; Early stage solution all is to adopt the differential signal of system controller output to become Transistor-Transistor Logic level through the differential signal module converts, drives output by two high-power MOS tubes, and the shortcoming of the scheme of this solution is that the driving force of signal is strong inadequately; The rising edge and the negative edge of waveform are steeper; Severe more to attenuation, the complete distortion of waveform, the cost of hardware is also than higher.

Recent solution is taked the pattern of 3 grades of amplifications, finally brings up to signal amplitude more than the 12V, and circuit structure is complicated, and hardware cost is than higher, and three grades of circuit of amplification have one-level not work will to have influence on the back level, cause the circuit merit just can not realize.The 5V Transistor-Transistor Logic level of output is lifted to the level more than the 12V at last through 3 grades of amplifications, and is as shown in Figure 3, specifically uses as shown in Figure 4.

Therefore, be necessary to propose the otherwise effective technique scheme, solve the drive controlling problem of LED signal.

The utility model content

The purpose of the utility model is intended to solve at least one of above-mentioned technological deficiency, and is special in using integrated circuit as driving amplification module, effectively improves the driveability of LED signal.

The utility model embodiment has proposed a kind of LED signal driving control system, comprises that system controller, differential signal change the Transistor-Transistor Logic level module, Transistor-Transistor Logic level drives amplification module and LED display device,

The differential signal of said system controller output gets into said differential signal changes the Transistor-Transistor Logic level module; Said differential signal commentaries on classics Transistor-Transistor Logic level module converts differential signal to Transistor-Transistor Logic level and imports said Transistor-Transistor Logic level driving amplification module; Said Transistor-Transistor Logic level drives amplification module Transistor-Transistor Logic level is amplified the said LED display device of back input; Wherein, Transistor-Transistor Logic level driving amplification module is an integrated circuit modules.

The such scheme that the utility model proposes; Use the driver module after improveing; Be in driving force or the reception to high-frequency signal, all to have greatly improved, and circuit structure is simple, cost is low; Avoided the uncertain factor that adopts resolution element to build amplifying circuit, the signal that is particularly suitable for being applied in the LED system of parallel connection or series connection drives.

Aspect that the utility model is additional and advantage part in the following description provide, and these will become obviously from the following description, or recognize through the practice of the utility model.

Description of drawings

Above-mentioned and/or additional aspect of the utility model and advantage are from obviously with easily understanding becoming the description of embodiment below in conjunction with accompanying drawing, wherein:

Fig. 1 is that the series LED chip for driving is connected synoptic diagram with system controller;

Fig. 2 is that the parallel connection LED chip for driving is connected synoptic diagram with system controller;

Fig. 3 drives the synoptic diagram that amplification module amplifies through triode step by step for Transistor-Transistor Logic level;

Fig. 4 drives the application synoptic diagram that amplification module amplifies through triode step by step for Transistor-Transistor Logic level;

Fig. 5 is the waveform sampling figure of existing scheme;

The waveform sampling figure of Fig. 6 after for the elongation distance of existing scheme;

Fig. 7 is the concrete application synoptic diagram of the utility model embodiment;

Fig. 8 is the synoptic diagram that the utility model embodiment Transistor-Transistor Logic level drives amplification module;

Fig. 9 is the waveform sampling figure based on the utility model;

Figure 10 is based on the waveform sampling figure after the elongation distance of the utility model.

Embodiment

Describe the embodiment of the utility model below in detail, the example of said embodiment is shown in the drawings, and wherein identical from start to finish or similar label is represented identical or similar elements or the element with identical or similar functions.Be exemplary through the embodiment that is described with reference to the drawings below, only be used to explain the utility model, and can not be interpreted as restriction the utility model.

In order to realize the purpose of the utility model, the utility model embodiment has proposed a kind of LED signal driving control system, comprises that system controller, differential signal change the Transistor-Transistor Logic level module, Transistor-Transistor Logic level drives amplification module and LED display device.The connection of each module and the structure as follows:

The output of system controller connects differential signal changes the Transistor-Transistor Logic level module; Differential signal changes the Transistor-Transistor Logic level module and connects Transistor-Transistor Logic level driving amplification module; Transistor-Transistor Logic level drives amplification module and connects the LED display device, and wherein, it is integrated circuit modules that Transistor-Transistor Logic level drives amplification module; The LED display device comprises LED chip for driving and LED lamp, and LED chip for driving and LED lamp are connected to form the LED display device through the structure of serial or parallel connection.

Particularly, the disclosed LED signal of the utility model embodiment driving control system is as shown in Figure 7, among Fig. 7, is that example describes with the LED display device of parallel-connection structure.

LED signal driving control system comprises that system controller, differential signal change the Transistor-Transistor Logic level module, Transistor-Transistor Logic level drives amplification module and LED display device.

The differential signal of system controller output gets into differential signal changes the Transistor-Transistor Logic level module; Differential signal changes the Transistor-Transistor Logic level module and converts differential signal to Transistor-Transistor Logic level input Transistor-Transistor Logic level driving amplification module; Transistor-Transistor Logic level drives amplification module Transistor-Transistor Logic level is amplified back input LED display device; Wherein, Transistor-Transistor Logic level driving amplification module is an integrated circuit modules.

Furthermore, differential signal commentaries on classics Transistor-Transistor Logic level module includes but not limited to chip MAX485, SP485EE or SN75176.

Furthermore, Transistor-Transistor Logic level driving amplification module comprises integrated circuit IR4427.

Of Fig. 8, be that the utility model embodiment Transistor-Transistor Logic level drives the synoptic diagram of amplification module, the structure that is connected that differential signal changes Transistor-Transistor Logic level module and Transistor-Transistor Logic level driving amplification module is shown simultaneously.

For example, as the embodiment of the utility model, the input of the two-way of IR4427 also connects the input signal that the back receives differential signal commentaries on classics Transistor-Transistor Logic level module, and the two-way of IR4427 is exported and connect back output and connects said LED display device.Input and output also together, the driving force of output signal can more be strengthened.

In the existing solution; The 5V Transistor-Transistor Logic level of output is lifted to the level more than the 12V at last through 3 grades of amplifications, and is as shown in Figure 3, as can beappreciated from fig. 3; The Transistor-Transistor Logic level of this solution drives amplification module and need amplify step by step through triode; The fault of certain one-level can cause the work of back level, and required part is many, because the switching characteristic of triode.In addition, Transistor-Transistor Logic level drives amplification module can not be through the signal of high frequency, otherwise the serious distortion of waveform.

The such scheme that the utility model proposes does not re-use resolution element and builds amplifying circuit, but adopts integrated circuit to accomplish, and has avoided that required part is many, the problem of individual part de-stabilising effect circuit performance.

The specific embodiment of existing solution is as shown in Figure 4; In this system applies; The Transistor-Transistor Logic level amplitude of coming out depends on the power supply VCC of input; The DAI input port of parallelly connected chip has been adopted a kind of form of electric resistance partial pressure to be divided to 5V to the Transistor-Transistor Logic level of amplitude 12V and has been supplied chip operation in the LED display device, because chip or single-chip microcomputer are not generally taked high pressure input technology, directly connecing the above level of 12V can break chip.Adopt high-pressure process like fruit chip or single-chip microcomputer input port, when device can bear high pressure, the divider resistance in Fig. 4 can be used and also can so.Measure T1 with oscillograph, during the T2 point, waveform is shown in Figure 5.Fig. 5 waveform is the low frequency signal of a kind of pulsewidth more than 4us, along with the increase of transmission range, the raising of signal frequency, for example through 200 meters at this point of T3, the decay of waveform is more serious, the rising edge and the negative edge of waveform are milder, as shown in Figure 6.If the time a kind of 500kbps above high-frequency signal that system sends, just distortion fully of the waveform of back level so causes chip not work.

Still identical test condition and environment are surveyed T1 and T2 point with oscillograph, and be as shown in Figure 9.Fig. 9 relative Fig. 5 waveform rising edge and negative edge all will be got well, particularly to high-frequency signal.Same reason, at T3, these 2 of T4, just amplitude descends, and does not have influence on the effect after the waveform dividing potential drop, and is shown in figure 10.

Can find out from top example contrast, be on driving force and high-frequency signal, all to have greatly improved through the driver module after the improvement, and circuit structure is simple especially, and cost is low, is particularly suitable for being applied in the signal driving of parallel system.

In addition, each functional unit in each embodiment of the utility model can be integrated in the processing module, also can be that the independent physics in each unit exists, and also can be integrated in the module two or more unit.Above-mentioned integrated module both can adopt the form of hardware to realize, also can adopt the form of software function module to realize.If said integrated module realizes with the form of software function module and during as independently production marketing or use, also can be stored in the computer read/write memory medium.

The above-mentioned storage medium of mentioning can be a ROM (read-only memory), disk or CD etc.

The above only is the part embodiment of the utility model; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; Can also make some improvement and retouching, these improvement and retouching also should be regarded as the protection domain of the utility model.

Claims

1. a LED signal driving control system is characterized in that, comprises that system controller, differential signal change the Transistor-Transistor Logic level module, Transistor-Transistor Logic level drives amplification module and LED display device,

2. LED signal driving control system as claimed in claim 1 is characterized in that, said differential signal changes the Transistor-Transistor Logic level module and comprises chip MAX485, SP485EE or SN75176.

3. LED signal driving control system as claimed in claim 1 is characterized in that, said Transistor-Transistor Logic level drives amplification module and comprises integrated circuit IR4427.

4. LED signal driving control system as claimed in claim 3; It is characterized in that; The two-way input of said IR4427 also connects the input signal that the back receives said differential signal commentaries on classics Transistor-Transistor Logic level module, and the two-way of said IR4427 is exported and connect back output and connects said LED display device.