CN205140489U

CN205140489U - Clock signal's controlling means and equipment

Info

Publication number: CN205140489U
Application number: CN201520893376.XU
Authority: CN
Inventors: 赵桂鹏; 张旭静
Original assignee: Leyard Optoelectronic Co Ltd
Current assignee: Leyard Optoelectronic Co Ltd
Priority date: 2015-11-10
Filing date: 2015-11-10
Publication date: 2016-04-06
Anticipated expiration: 2025-11-10

Abstract

The utility model discloses a clock signal's controlling means and equipment. Wherein, the device includes: the module takes place for clock signal for produce constant frequency's clock signal, the module electricity takes place with clock signal and is connected for conversion module for convert constant frequency's clock signal into frequency conversion clock signal, drive module is connected with the conversion module electricity for produce drive signal according to frequency conversion clock signal. The utility model provides a prior art LED show the technical problem that electromagnetic interference is big of product.

Description

The control device of clock signal and equipment

Technical field

The utility model relates to field of circuit control, in particular to a kind of control device and equipment of clock signal.

Background technology

Due to LED have that brightness is high, operating voltage is low, power consumption is little, maximize, life-span long, shock-resistant and stable performance, LED is developed rapidly.LED display is widely used in the advertising of the outdoor locations such as bank, school, hotel.

Due to the semiconductor devices that LED is characteristic sensitivity, again there is negative temperature characteristic, therefore need driving power.Fig. 1 is the schematic diagram of the control system of a kind of clock signal according to prior art, and as shown in Figure 1, FPGA clock signal t is to 245 driving chip, and 245 driving chip are powered to constant current source chip.Further constant current source chip, to LED display constant current-supplying, ensures that LED display display effect is best.

But the frequency of the clock signal t that FPGA exports is fixed frequency in prior art, the electromagnetic interference (EMI) realizing constant current source chip operation is like this large, affects the normal work of constant current source chip, causes LED display display effect poor.

For the technical matters that the electromagnetic interference (EMI) of prior art LED display product is large, at present effective solution is not yet proposed.

Utility model content

The utility model embodiment provides a kind of control device and equipment of clock signal, with the technical matters that the electromagnetic interference (EMI) at least solving prior art LED display product is large.

According to an aspect of the utility model embodiment, provide a kind of control device of clock signal, comprising: clock signal generation module, for generation of the clock signal of fixed frequency; Modular converter, is electrically connected with clock signal generation module, for the clock signal of fixed frequency is converted to variable frequency clock signal; Driver module, is electrically connected with modular converter, for producing drive singal according to variable frequency clock signal.

According to the another aspect of the utility model embodiment, additionally provide a kind of opertaing device of clock signal, comprising: the control device of above-mentioned clock signal.

In the utility model embodiment, being connected with clock signal generation module and driver module by adding modular converter, the solid frequency clock signal that clock signal generation module produces can being converted to variable frequency clock signal.Therefore, such scheme passes through the redistributed power of the clock signal of narrow-band in wider frequency band, reduce the dominant frequency of peak amplitude frequency spectrum, reduce the interfering energy of electromagnetic radiation further, thus the problem that the electromagnetic interference (EMI) solving prior art LED display product is large.It can thus be appreciated that, the control device of the clock signal that the above embodiments of the present application provide can realize the object of the electromagnetic interference (EMI) reducing LED display product, avoid electromagnetic interference (EMI) excessive to LED show product cause damage, increase the serviceable life that LED shows product, improve the display effect that LED shows product, reduce the electromagnetic radiation to user, improve the likability of user.

Accompanying drawing explanation

Accompanying drawing described herein is used to provide further understanding of the present utility model, and form a application's part, schematic description and description of the present utility model, for explaining the utility model, is not formed improper restriction of the present utility model.In the accompanying drawings:

Fig. 1 is the schematic diagram of the control device of a kind of clock signal according to prior art;

Fig. 2 is the schematic diagram of the control device of a kind of clock signal according to the utility model embodiment;

Fig. 3 is the schematic diagram of the control device of a kind of optional clock signal according to the utility model embodiment;

Fig. 4 is the schematic diagram of the clock signal of a kind of optional fixed frequency according to the utility model embodiment;

Fig. 5 is the schematic diagram of a kind of optional variable frequency clock signal according to the utility model embodiment; And

Fig. 6 is the schematic diagram of the control device according to the optional clock signal of the another kind of the utility model embodiment.

Embodiment

The utility model scheme is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the utility model embodiment, technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the embodiment of the utility model part, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all should belong to the scope of the utility model protection.

It should be noted that, term " first ", " second " etc. in instructions of the present utility model and claims and above-mentioned accompanying drawing are for distinguishing similar object, and need not be used for describing specific order or precedence.Should be appreciated that the data used like this can be exchanged in the appropriate case, so as embodiment of the present utility model described herein can with except here diagram or describe those except order implement.In addition, term " comprises " and " having " and their any distortion, intention is to cover not exclusive comprising, such as, contain those steps or unit that the process of series of steps or unit, method, system, product or equipment is not necessarily limited to clearly list, but can comprise clearly do not list or for intrinsic other step of these processes, method, product or equipment or unit.

Embodiment 1

According to the utility model embodiment, provide a kind of control device embodiment of clock signal.

Fig. 2 is the schematic diagram of the control device of a kind of clock signal according to the utility model embodiment, and as shown in Figure 2, this device comprises: clock signal generation module 21, modular converter 23 and driver module 25, wherein,

Clock signal generation module 21, for generation of the clock signal of fixed frequency.

Particularly, clock signal generation module can be FPGA or MCU, but is not limited only to this, and other modules that may be used for the clock signal producing fixed frequency also can realize the object of the present embodiment.

Modular converter 23, is electrically connected with clock signal generation module 21, for the clock signal of fixed frequency is converted to variable frequency clock signal.

Particularly, modular converter can be exhibition chip frequently, but is not limited only to this, and other modules that may be used for the clock signal of fixed frequency to be converted to variable frequency clock signal also can realize the object of the present embodiment.

Driver module 25, is electrically connected with modular converter 23, for producing drive singal according to variable frequency clock signal.

Particularly, driver module can be 245 driving chip or constant current source chip, but is not limited only to this, and other modules that may be used for the clock signal of fixed frequency to be converted to variable frequency clock signal also can realize the object of the present embodiment.

In the above embodiments of the present application, being connected with clock signal generation module and driver module by adding modular converter, the solid frequency clock signal that clock signal generation module produces can being converted to variable frequency clock signal.Therefore, such scheme passes through the redistributed power of the clock signal of narrow-band in wider frequency band, reduce the dominant frequency of peak amplitude frequency spectrum, reduce the interfering energy of electromagnetic radiation further, thus the problem that the electromagnetic interference (EMI) solving prior art LED display product is large.It can thus be appreciated that, the control device of the clock signal that the above embodiments of the present application provide can realize the object of the electromagnetic interference (EMI) reducing LED display product, avoid electromagnetic interference (EMI) excessive to LED show product cause damage, increase the serviceable life that LED shows product, improve the display effect that LED shows product, reduce the electromagnetic radiation to user, improve the likability of user.

Alternatively, in the above embodiments of the present application, above-mentioned control device also comprises:

Display module 27, is electrically connected with driver module 25, for showing according to drive singal.

Particularly, the LED display module that display module can be formed for LED, such as LED display, but be not limited only to this, other modules that may be used for carrying out showing according to drive singal also can realize the object of the present embodiment.

Alternatively, in the above embodiments of the present application, clock signal generation module 21 is FPGA.

Particularly, as shown in Figure 3, the model of above-mentioned FPGA is the clock signal t of the pin clk output fixed frequency of alteraEP4CE15, FPGA, as shown in Figure 5.

Alternatively, in the above embodiments of the present application, modular converter 23 is exhibition chip frequently.

Particularly, as shown in Figure 3, the model of above-mentioned exhibition frequency chip is SPREADSSDCI3128AF-08-CT, the input pin input clock signal t of exhibition frequency chip, output pin clock signal t '.

Alternatively, in the above embodiments of the present application, exhibition frequently chip is used for variable frequency clock signal to fluctuate in preset threshold range, and wherein, preset threshold range is-0.4% to 0.4%.

Particularly, composition graphs 3 is known, and the frequency of clock signal t is in the diagram fixed, and frequency variation signal t ' can fluctuate in the scope of t ± 0.4%t.In Fig. 5, clock signal t1 is different with t2 frequency, and t1 and t2 all meets and fluctuate in preset threshold range, such as t1=t+0.3%t, t2=t+0.2%t.

Alternatively, in the above embodiments of the present application, driver module 25 comprises:

N constant current source chip 251, is electrically connected with display module 27, and for being display module 27 constant current-supplying, wherein, n is natural number.

245 driving chip 253, are electrically connected with modular converter 23 and n constant current source chip 251, power for giving n constant current source chip 251.

Particularly, the model of above-mentioned constant current chip 251 is MYMY9868QAB, and the model of above-mentioned 245 driving chip 253 is NXP74HCT245PW.N can determine as required, and such as n can by tens to hundreds of.

In a kind of optional embodiment, as shown in Figure 6, variable frequency clock signal t ' inputs the input pin of 245 driving chip, the output pin of 245 driving chip connects the input pin of 1 constant current source chip, i.e. Sdk pin, constant current source chip has 16 output pins, i.e. out0-out15, the VCC pin of 245 driving chip and constant current source chip connects power supply, GND pin ground connection.

Alternatively, in the above embodiments of the present application, display module 27 is LED group.

In a kind of optional embodiment, as shown in Figure 6, constant current source chip 251 has 16 output pins, and each pin can connect a LED in LED group, and therefore LED group can comprise 16 LED.

Alternatively, in the above embodiments of the present application, each constant current source chip 251 connects m LED group, and wherein, m is natural number.

Particularly, m can set as required, and such as m can be 3.

In a kind of optional embodiment, as shown in Figure 6, each constant current source chip 251 can connect 3 LED groups, and each LED group comprises 16 LED.

Embodiment 2

According to the utility model embodiment, provide a kind of opertaing device embodiment of clock signal, this opertaing device comprise shown in Fig. 2 time clocked signal control device.

Above-mentioned the utility model embodiment sequence number, just to describing, does not represent the quality of embodiment.

In above-described embodiment of the present utility model, the description of each embodiment is all emphasized particularly on different fields, in certain embodiment, there is no the part described in detail, can see the associated description of other embodiments.

The above is only preferred implementation of the present utility model; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.

Claims

1. a control device for clock signal, is characterized in that, comprising:

Clock signal generation module, for generation of the clock signal of fixed frequency;

Modular converter, is electrically connected with described clock signal generation module, for the clock signal of described fixed frequency is converted to variable frequency clock signal; And

Driver module, is electrically connected with described modular converter, for producing drive singal according to described variable frequency clock signal.

2. device according to claim 1, is characterized in that, described device also comprises:

Display module, is electrically connected with described driver module, for showing according to described drive singal.

3. device according to claim 2, is characterized in that, described clock signal generation module is FPGA.

4. device according to claim 2, is characterized in that, described modular converter is exhibition chip frequently.

5. device according to claim 4, is characterized in that, described exhibition frequently chip is used for described variable frequency clock signal to fluctuate in preset threshold range, and wherein, described preset threshold range is-0.4% to 0.4%.

6. device according to claim 2, is characterized in that, described driver module comprises:

N constant current source chip, is electrically connected with described display module, and for being described display module constant current-supplying, wherein, described n is natural number;

245 driving chip, connect with described modular converter and described n constant current source chip electrical, for giving described n constant current source chip power supply.

7. device according to claim 2, is characterized in that, described display module is LED group.

8. device according to claim 7, is characterized in that, each constant current source chip connects m LED group, and wherein, described m is natural number.

9. an opertaing device for clock signal, is characterized in that, comprises the control device of clock signal described in any one in claim 1 to 8.