CN201611914U - VGA signal distributor circuit and television testing system - Google Patents
VGA signal distributor circuit and television testing system Download PDFInfo
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- CN201611914U CN201611914U CN2010200021024U CN201020002102U CN201611914U CN 201611914 U CN201611914 U CN 201611914U CN 2010200021024 U CN2010200021024 U CN 2010200021024U CN 201020002102 U CN201020002102 U CN 201020002102U CN 201611914 U CN201611914 U CN 201611914U
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Abstract
The utility model discloses a VGA signal distributor circuit and a television testing system, belonging to the technical field of electronics, and solving the technical problems of complex circuit, poor reliability and poor consistency of the amplitude of a VGA signal output by the circuit of the prior art. The VGA signal distributor circuit comprises a signal distribution chip which is used for receiving a VGA line signal input by a line signal input terminal, and the VGA line signal is converted into at least two paths of VGA line signals, and then the amplitude of each path of VGA line signal is enlarged, and the VGA line signal is output respectively by at least two paths of line signal output terminals; the signal distribution chip is also used for receiving a VGA field signal input by the field signal input terminal, and converting the VGA field signal into at least two paths of VGA field signals; and then the amplitude of each path of VGA field signal is enlarged, and the VGA field signal is output respectively by at least two paths of field signal output terminals. The television testing system comprises the VGA signal distributor circuit disclosed by the utility model. The utility model is applied to distributing of VGA signals.
Description
Technical field
The utility model belongs to electronic technology field, the tv test system that is specifically related to a kind of VGA signal distribution circuit and is provided with this VGA signal distribution circuit.
Background technology
Along with the continuous development of electronic technology, television set has become one of household electrical appliance the most common in people's daily life.
After various functional modules on the television set interior circuit board or function element assemble, need test, just can dispatch from the factory after the test passes circuit board.The signal source that sends test massage for the circuit board that needs test in the prior art (or claim: involving great expense test signal generation equipment), so when the TV set circuit plate tested, the shared signal source of circuit board that need test of polylith usually.
When test, need the road signal that signal source sends be converted into multiple signals by signal multichannel distributor circuit, so just can send test massage to a plurality of different circuit boards, and then test a plurality of different circuit boards by a signal source.
The VGA signal distribution circuit is that a kind of being exclusively used in is converted into multipath VGA signal with one road VGA signal, thereby supports the circuit that a VGA signal source is tested a plurality of circuit boards.Existing VGA signal distribution circuit is mainly multistage common-base circuit, and existing multistage common-base circuit includes a plurality of triodes and a plurality of electric capacity usually.
The inventor finds that there is following problem at least in prior art in realizing process of the present utility model:
Because existing VGA signal distribution circuit comprises a plurality of triodes and a plurality of electric capacity, parts are many, and then also cause the circuit complexity; Simultaneously, owing to some performances of triode easily along with the variation of ambient temperature changes, and the reason of the characteristic of triode itself, using triode to carry out in the process that the capable signal of VGA and VGA field signal distribute the capable signal of VGA and the VGA field signal is easy to generate spike at rising edge and trailing edge, the poor reliability that causes entire circuit is so the amplitude fluctuation of the VGA signal of output is bigger, consistency is poor.
The utility model content
The utility model embodiment provides a kind of VGA signal distribution circuit and tv test system, has solved the technical problem of amplitude consistency difference that there is the VGA signal of circuit complexity, poor reliability and circuit output in existing VGA signal distribution circuit.
For achieving the above object, embodiment of the present utility model adopts following technical scheme:
This VGA signal distribution circuit comprises capable signal input part, field signal input, signal allocation chip, capable signal output part of two-way and two-way field signal output at least at least, wherein:
Described signal allocation chip is used to receive the capable signal of VGA that capable signal input part is imported, and the capable signal of described VGA is converted into the capable signal of two-way VGA at least, increase the amplitude of the capable signal of the described VGA in every road then, the more capable signal of described VGA is passed through the described capable signal output part output of two-way at least respectively;
Described signal allocation chip also is used for the VGA field signal that the received field signal input part is imported, and described VGA field signal is converted into two-way VGA field signal at least, increase the amplitude of the described VGA field signal in every road then, more described VGA field signal is passed through the described field signal output output of two-way at least respectively.
Further, described signal allocation chip comprises that capable signal allocation chip and field signal divide distribution chip, wherein:
Described capable signal allocation chip is used to receive the capable signal of VGA that capable signal input part is imported, and the capable signal of described VGA is converted into the capable signal of two-way VGA at least, increase the amplitude of the capable signal of the described VGA in every road then, the more capable signal of described VGA is passed through the described capable signal output part output of two-way at least respectively;
Described field signal divides distribution chip to be used for the VGA field signal that the received field signal input part is imported, and described VGA field signal is converted into two-way VGA field signal at least, increase the amplitude of the described VGA field signal in every road then, more described VGA field signal is passed through the described field signal output output of two-way at least respectively.
Further, the capable signal of the VGA that described capable signal input part is imported is one the tunnel, and described capable signal output part is at least five the tunnel;
The VGA field signal that described field signal input is imported is one the tunnel, and described field signal output is at least five the tunnel.
Further, capable signal of described VGA and described VGA field signal are synchronizing signal, and it is with a kind of chip that described capable signal allocation chip and described field signal divide distribution chip.
Further, described capable signal allocation chip and described field signal divide distribution chip all also to comprise at least two signal input pins, power pins and grounding pins, wherein:
The number of described signal input pin is identical with described capable signal output part or described field signal output, and described signal input pin links to each other with described capable signal input part or field signal input, is used to receive capable signal of VGA or VGA field signal;
Described power pins links to each other with power supply, is used to described capable signal allocation chip or described field signal to distribute the chip supply electric energy;
Described grounding pin ground connection.
Further, described capable signal allocation chip and described field signal divide distribution chip to be ternary chip for driving.
Further, described ternary chip for driving is the 74HC244 chip.
Further, the described capable signal output part in every road is exported the capable signal of one tunnel described VGA, and the described field signal output in every road is exported one tunnel described VGA field signal, and the described field signal output of the described capable signal output part in every road and every road is all continuous with different circuit boards.
Further, described circuit board is the mainboard of television set.
This tv test system comprises the VGA signal distribution circuit that above-mentioned the utility model embodiment is provided.
Compared with prior art, the utility model provides the arbitrary technical scheme in the technique scheme to have following advantage:
Because the VGA signal distribution circuit has adopted the signal allocation chip in the present embodiment, the signal allocation chip not only can receive the capable signal of VGA that capable signal input part is imported, and the capable signal of VGA is converted into the capable signal of two-way VGA at least, increase the amplitude of the capable signal of every road VGA then, the more capable signal of VGA is passed through the capable signal output part output of two-way at least respectively; And the VGA field signal can also the received field signal input part imported of signal allocation chip, and the VGA field signal is converted into two-way VGA field signal at least, increase the amplitude of every road VGA field signal then, again the VGA field signal is passed through two-way field signal output output at least respectively;
This shows, only need to use the signal allocation chip just can realize the function that existing VGA signal distribution circuit can be realized in the present embodiment, compare with existing VGA signal distribution circuit that not only parts are few, and circuit is simple.In addition, because the signal allocation chip performance is stable, it is also very limited when external factor such as ambient temperature change to the influence that performance caused of signal allocation chip, so the reliability of entire circuit is relatively good, the amplitude fluctuation of the VGA signal of circuit output is also smaller, so solved the technical problem of amplitude consistency difference that there is the VGA signal of circuit complexity, poor reliability and circuit output in existing VGA signal distribution circuit.
Description of drawings
Fig. 1 is the schematic diagram of the VGA signal distribution circuit internal structure that embodiment of the present utility model provided;
Fig. 2 is the schematic diagram of the preferred implementation of the VGA signal distribution circuit that embodiment of the present utility model provided;
Fig. 3 is the schematic diagram of the embodiment of the VGA signal distribution circuit that embodiment of the present utility model shown in Figure 2 provided;
Fig. 4 divides the schematic diagram of the concrete enforcement circuit of distribution chip for row signal allocation chip or field signal in the VGA signal distribution circuit that embodiment of the present utility model shown in Figure 3 provided.
Embodiment
Below in conjunction with accompanying drawing the utility model embodiment is described in detail.
The utility model embodiment provides VGA signal distribution circuit that a kind of circuit is simple, circuit reliability is relatively good and the amplitude fluctuation of the VGA signal of circuit output is smaller and the tv test system that is provided with this VGA signal distribution circuit.
As shown in Figure 1, the VGA signal distribution circuit that the utility model embodiment is provided comprises capable signal input part 1, field signal input 2, signal allocation chip 3, capable signal output part 4 of two-way and two-way field signal output 5 at least at least, wherein:
Because the VGA signal distribution circuit has adopted signal allocation chip 3 in the present embodiment, signal allocation chip 3 not only can receive the capable signal of VGA that capable signal input part 1 is imported, and the capable signal of VGA is converted into the capable signal of two-way VGA at least, increase the amplitude of the capable signal of every road VGA then, again the capable signal of VGA is passed through capable signal output part 4 outputs of two-way at least respectively, and the VGA field signal can also received field signal input part 2 imported of signal allocation chip 3, and the VGA field signal is converted into two-way VGA field signal at least, increase the amplitude of every road VGA field signal then, again the VGA field signal is passed through two-way field signal output 5 outputs at least respectively;
This shows, only need to use signal allocation chip 3 just can realize the function that existing VGA signal distribution circuit can be realized in the present embodiment, compare with existing VGA signal distribution circuit that not only parts are few, and circuit is simple.Simultaneously, because signal allocation chip 3 stable performances, it is also very limited when external factor such as ambient temperature change to the influence that performance caused of signal allocation chip 3, so the reliability of entire circuit is relatively good, the amplitude fluctuation of the VGA signal of circuit output is also smaller, so solved the technical problem of amplitude consistency difference that there is the VGA signal of circuit complexity, poor reliability and circuit output in existing VGA signal distribution circuit;
In addition, because the signal allocation chip can increase the amplitude of capable signal of VGA and VGA field signal, thereby make that the VGA field signal amplitude of row capable signal of signal output part outputting VGA and the output of field signal output is bigger, driving force is stronger.
As shown in Figure 2, signal allocation chip 3 comprises that capable signal allocation chip 31 and field signal divide distribution chip 32, wherein: row signal allocation chip 31 is used to receive the capable signal of VGA that capable signal input part 1 is imported, and the capable signal of VGA is converted into the capable signal of two-way VGA at least, increase the amplitude of the capable signal of every road VGA then, the more capable signal of VGA is passed through capable signal output part 4 outputs of two-way at least respectively;
Field signal divides distribution chip 32 to be used for the VGA field signal that received field signal input part 2 is imported, and the VGA field signal is converted into two-way VGA field signal at least, increase the amplitude of every road VGA field signal then, again the VGA field signal is passed through two-way field signal output 5 outputs at least respectively.
The capable signal of VGA transforms, distributes by different chips respectively with the VGA field signal in the present embodiment, can avoid like this interfering with each other between two kinds of signals.
The capable signal of VGA that row signal input part 1 is imported is one the tunnel, and row signal output part 4 is at least five the tunnel; The VGA field signal that field signal input 2 is imported is one the tunnel, and field signal output 5 is at least five the tunnel.
Every road row signal input part 1 can receive the capable signal of one road VGA, every road field signal input 2 can receive one road VGA field signal, usually each VGA signal source can be exported the capable signal of at least one road VGA, one road VGA field signal, so this design can so that a VGA signal source simultaneously five circuit boards are tested, certainly, going what of circuit board number that the number of signal output part 4 and field signal output 5 can test according to actual needs is provided with more a plurality of.
Capable signal of VGA and VGA field signal are synchronizing signal, and it is with a kind of chip that row signal allocation chip 31 divides distribution chip 32 with field signal.When capable signal of VGA and VGA field signal are synchronizing signal, can measure the recognition performance of circuit board simultaneously to the represented image of two class VGA signals.Make not only that with a kind of circuit connecting method of chip is similar the attended operation of chip is more convenient, and conveniently purchase chip in batches, help reducing the VGA signal distribution circuit cost that present embodiment provides.
As shown in Figure 3 and Figure 4, row signal allocation chip 31 and field signal divide distribution chip 32 to include signal input pin A1, A2, A3, A4, A5 in the present embodiment, power pins VCC and grounding pin GND, wherein: the number of signal input pin A1, A2, A3, A4, A5 is identical with row signal output part 4 or field signal output 5, and signal input pin A1, A2, A3, A4, A5 link to each other with row signal input part 1 or field signal input 2, are used to receive capable signal of VGA or VGA field signal; Power pins VCC links to each other with power supply Vc, is used to capable signal allocation chip 31 or field signal to divide distribution chip 32 supply electric energy; Grounding pin GND ground connection.
Present embodiment midfield signal allocation chip 32 and row signal allocation chip 31 include five signal input pin A1, A2, A3, A4, A5, and five signal input pin A1, A2, A3, A4, A5 parallel connections link to each other with row signal input part 1 or field signal input 2 afterwards.The number of signal input pin A1, A2, A3, A4, A5 and capable signal output part 4 and field signal output 5 is identical.Design like this helps the capable signal of VGA and the VGA field signal amplitude unanimity of dividing distribution chip 32 or row signal allocation chip 31 from each signal input pin A1, A2, A3, A4, A5 input field signal.
As shown in Figure 3 and Figure 4, row signal allocation chip 31 and field signal divide distribution chip 32 also to comprise idle input G1, G2, G3, idle output B1, B2, B3, in the present embodiment when capable signal of VGA that does not need to export too many road or VGA field signal, can be with leave unused input G1, G2, G3 ground connection, at this moment, idle output B1, B2, B3 can not use; When needs more than five tunnel during output of the capable signal of VGA or VGA field signal, can use idle input G1, G2, G3 one or more input capable signal of VGA or VGA field signal, simultaneously, also use idle output B1, B2, the capable signal of one or more outputting VGA of B3 or VGA field signal.Grounding pin GND divides distribution chip 32 and row signal allocation chip 31 to play a protective role to field signal.
The voltage of power supply Vc is 4V～6V, is preferably 5V.This magnitude of voltage can guarantee that field signal divides the need for electricity of distribution chip 32 and row signal allocation chip 31, can not expend too many electric energy simultaneously yet.
In the present embodiment between the power pins VCC of power supply Vc and row signal allocation chip 31, power supply Vc and field signal divide between the power pins VCC of distribution chip 32 and also be in series with inductance L, also is connected with capacitor C 1, the C2 of ground connection between inductance L and the power pins VCC.Inductance L and capacitor C 1, C2 play the effect of filtering, thereby the voltage that assurance power pins VCC is connect is more stable, so help to improve chip reliability.
Row signal allocation chip 31 and field signal divide distribution chip 32 to be ternary chip for driving.Ternary chip for driving can drive the capable signal of VGA, VGA field signal and burst signal simultaneously.
Ternary chip for driving is preferably the 74HC244 chip.The 74HC244 chip is a kind of stable performance, cheap ternary chip for driving, at present, the 74HC244 chip is used for the driving of clock more, use the 74HC244 chip not only can realize the multichannel of capable signal of VGA and VGA field signal is distributed in the present embodiment, and overcome the technology prejudice in this field.
The capable signal of every road row signal output part 4 output one road VGA, every road field signal output 5 outputs one road VGA field signal, and every road row signal output part 4 and every road field signal output 5 are all continuous with different circuit boards.
Circuit board is the mainboard of television set.The mainboard of television set is the important devices in the television set, and mainboard is provided with multiple power consumption device, and the suitable VGA signal distribution circuit that adopts the utility model embodiment to be provided sends test massage to circuit board.Certainly, circuit board can also be the circuit board of similar TV SKD in other circuit boards outside the mainboard and other household electrical appliance in the television set.
The tv test system that the utility model embodiment is provided comprises the VGA signal distribution circuit that above-mentioned the utility model embodiment is provided.
Because the identical technical characterictic of VGA signal distribution circuit that is provided with above-mentioned the utility model embodiment is provided in the utility model embodiment tv test system, so both not only have unicity, and can also produce identical technique effect, solve identical technical problem.
The above; it only is embodiment of the present utility model; but protection range of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; can expect easily changing or replacing, all should be encompassed within the protection range of the present utility model.Therefore, protection range of the present utility model should be as the criterion with the protection range of claim.
Claims (10)
1. VGA signal distribution circuit is characterized in that: comprise capable signal input part, field signal input, signal allocation chip, capable signal output part of two-way and two-way field signal output at least at least, wherein:
Described signal allocation chip is used to receive the capable signal of VGA that capable signal input part is imported, and the capable signal of described VGA is converted into the capable signal of two-way VGA at least, increase the amplitude of the capable signal of the described VGA in every road then, the more capable signal of described VGA is passed through the described capable signal output part output of two-way at least respectively;
Described signal allocation chip also is used for the VGA field signal that the received field signal input part is imported, and described VGA field signal is converted into two-way VGA field signal at least, increase the amplitude of the described VGA field signal in every road then, more described VGA field signal is passed through the described field signal output output of two-way at least respectively.
2. VGA signal distribution circuit according to claim 1 is characterized in that: described signal allocation chip comprises that capable signal allocation chip and field signal divide distribution chip, wherein:
Described capable signal allocation chip is used to receive the capable signal of VGA that capable signal input part is imported, and the capable signal of described VGA is converted into the capable signal of two-way VGA at least, increase the amplitude of the capable signal of the described VGA in every road then, the more capable signal of described VGA is passed through the described capable signal output part output of two-way at least respectively;
Described field signal divides distribution chip to be used for the VGA field signal that the received field signal input part is imported, and described VGA field signal is converted into two-way VGA field signal at least, increase the amplitude of the described VGA field signal in every road then, more described VGA field signal is passed through the described field signal output output of two-way at least respectively.
3. VGA signal distribution circuit according to claim 2 is characterized in that: described capable signal input part is one the tunnel, and described capable signal output part is at least five the tunnel;
Described field signal input is one the tunnel, and described field signal output is at least five the tunnel.
4. VGA signal distribution circuit according to claim 2 is characterized in that: it is with a kind of chip that described capable signal allocation chip and described field signal divide distribution chip.
5. VGA signal distribution circuit according to claim 4 is characterized in that: described capable signal allocation chip and described field signal divide distribution chip all also to comprise at least two signal input pins, power pins and grounding pins, wherein:
The number of described signal input pin is identical with described capable signal output part or described field signal output, and described signal input pin links to each other with described capable signal input part or field signal input, is used to receive capable signal of VGA or VGA field signal;
Described power pins links to each other with power supply, is used to described capable signal allocation chip or described field signal to distribute the chip supply electric energy;
Described grounding pin ground connection.
6. VGA signal distribution circuit according to claim 5 is characterized in that: described capable signal allocation chip and described field signal divide distribution chip to be ternary chip for driving.
7. VGA signal distribution circuit according to claim 6 is characterized in that: described ternary chip for driving is the 74HC244 chip.
8. VGA signal distribution circuit according to claim 1, it is characterized in that: the described capable signal output part in every road is exported the capable signal of one tunnel described VGA, the described field signal output in every road is exported one tunnel described VGA field signal, and the described field signal output of the described capable signal output part in every road and every road is all continuous with different circuit boards.
9. VGA signal distribution circuit according to claim 8 is characterized in that: described circuit board is the mainboard of television set.
10. a tv test system is characterized in that: comprise aforesaid right requirement 1 to 9 arbitrary described VGA signal distribution circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010200021024U CN201611914U (en) | 2010-01-06 | 2010-01-06 | VGA signal distributor circuit and television testing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010200021024U CN201611914U (en) | 2010-01-06 | 2010-01-06 | VGA signal distributor circuit and television testing system |
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| CN201611914U true CN201611914U (en) | 2010-10-20 |
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| CN2010200021024U Expired - Fee Related CN201611914U (en) | 2010-01-06 | 2010-01-06 | VGA signal distributor circuit and television testing system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102622084A (en) * | 2012-03-09 | 2012-08-01 | 浪潮电子信息产业股份有限公司 | Novel method for detecting keyboard, video and mouse (KVM) products |
| CN102724470A (en) * | 2012-05-30 | 2012-10-10 | 中国科学院长春光学精密机械与物理研究所 | Device for converting SOG videos into VGA videos |
| CN103618859A (en) * | 2013-11-29 | 2014-03-05 | 中国航空无线电电子研究所 | DVI video signal distributor capable of meeting aeronautical environment application requirement |
| CN106713809A (en) * | 2016-12-28 | 2017-05-24 | 中国科学院长春光学精密机械与物理研究所 | Video format conversion device |
-
2010
- 2010-01-06 CN CN2010200021024U patent/CN201611914U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102622084A (en) * | 2012-03-09 | 2012-08-01 | 浪潮电子信息产业股份有限公司 | Novel method for detecting keyboard, video and mouse (KVM) products |
| CN102724470A (en) * | 2012-05-30 | 2012-10-10 | 中国科学院长春光学精密机械与物理研究所 | Device for converting SOG videos into VGA videos |
| CN103618859A (en) * | 2013-11-29 | 2014-03-05 | 中国航空无线电电子研究所 | DVI video signal distributor capable of meeting aeronautical environment application requirement |
| CN106713809A (en) * | 2016-12-28 | 2017-05-24 | 中国科学院长春光学精密机械与物理研究所 | Video format conversion device |
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