CN206117845U - Spare signal automatic switch -over circuit of video - Google Patents
Spare signal automatic switch -over circuit of video Download PDFInfo
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- CN206117845U CN206117845U CN201621017462.5U CN201621017462U CN206117845U CN 206117845 U CN206117845 U CN 206117845U CN 201621017462 U CN201621017462 U CN 201621017462U CN 206117845 U CN206117845 U CN 206117845U
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Abstract
The utility model discloses a spare signal automatic switch -over circuit of video belongs to signal switch circuit field, spare signal automatic switch -over circuit of video including the A signal detection module, the B signal detection module who is used for spare signal acquisition and detection that are used for main signal acquisition and detection, be used for output and show control signal's signal selection module and be used for generating the logical conversion module of selecting control signal, a signal detection module B signal detection module the logical conversion module and signal selection module electricity is in proper order connected. The utility model discloses a spare signal automatic switch -over circuit of video, the redundant short response time who switches of its signal, and the switching process is reliable and stable to can accomplish the automatic switch -over of signal through fault detection.
Description
Technical field
This utility model is related to signal switching circuit field, more particularly to a kind of video backup signal automatically switches
Circuit.
Background technology
In large-screen splicing industry, have stability that many application scenarios switch to signal and reliability have comparison it is high will
Ask.For example：Railway signal scheduling etc. requires what signal uninterruptedly showed, in order to ensure the stability of signal, usually using letter
Number Double redundancy backup.When main signal break down cannot normal transmission when, be switched to space signal and shown, it is to avoid splicing
The problems such as screen blank screen that in use certain unit is caused due to dropout, so as to ensure the reliability of system.
The implementation of existing signal redundancy switching relies primarily on the control of Programmable detection and CPU to switch over.Example
Such as：By fpga logic units test, judge whether input signal is normal, when abnormal signal or no signal is detected, then
Notify that CPU, CPU are received after interruption in the switching that signal is realized by control signal selecting module in the way of interrupting.
This signal redundancy switching mode relies primarily on Programmable detection, finds and process the time-consuming longer of abnormal signal, when main signal event
During barrier, it is impossible to be switched to space signal in time and shown, and completely control is switched over by program, also existed abnormal tactile
The risk sent out, the problems such as cause the signal of system to show inaccurate, unstable.
Utility model content
In order to overcome the defect of prior art, technical problem to be solved in the utility model is to propose that a kind of video is standby
Part signal automatic switch-over circuit, the response time of its signal redundancy switching is short, and handoff procedure is reliable and stable, and can be by event
Barrier detection completes the automatic switchover of signal.
It is that, up to this purpose, this utility model is employed the following technical solutions：
A kind of video backup signal automatic switch-over circuit that this utility model is provided, including for main signal collection and detection
A-signal detection module, for backup signal gather and detect B signal detection module, for output and display control signal
Signal selection module and for generate select control signal logistic transformation module, the a-signal detection module, the B
Signal detection module, the logistic transformation module and the signal selection module are sequentially connected electrically.
In this utility model preferably embodiment, the logistic transformation module include the first logic inverter circuit, the
Two logic inverter circuits, logical AND gate circuit and logic sum gate circuit, the first signal output part of the a-signal detection module
Electrically connect with the signal input part of the first logic inverter circuit, first signal output part point of the B signal detection module
Signal input part, the first signal input part of the logic sum gate circuit not with the second logic inverter circuit is electrically connected,
The signal output part of the first logic inverter circuit, the signal output part of the second logic inverter circuit are patrolled respectively with described
Volume electrically connect with the signal input part of gate circuit first and secondary signal input, the signal output part of the logical AND gate circuit and
Logic sum gate circuit secondary signal input electrical connection, the signal output part of the logical AND gate circuit, the logic or
Gate circuit signal output part is electrically connected with the logistic transformation module.
In this utility model preferably embodiment, the a-signal detection module include main signal input circuit and with
The main signal detection circuit of the main signal input circuit electrical connection, the B signal detection module includes space signal input electricity
Road and the space signal detection circuit electrically connected with the space signal input circuit.
In this utility model preferably embodiment, the main signal input circuit is configured to DVI connector, the master
Signal deteching circuit is configured to the chip of MAX381CCM+ models, the 1st pin of the main signal input circuit, the 2nd pin,
6 pins, the 7th pin, the 17th pin, the 18th pin, the 23rd pin, the 24th pin detect respectively the of circuit with the main signal
2 pins, the 3rd pin, the 6th pin, the 7th pin, the 10th pin, the 11st pin, the 15th pin, the electrical connection of the 14th pin, it is described
Space signal input circuit U21 is configured to DVI connector, and the space signal detection circuit U 32 is configured to MAX381CCM+ types
Number chip, the pin of space signal input circuit the 1st, the 2nd pin, the 6th pin, the 7th pin, the 17th pin, the 18th are drawn
Foot, the 23rd pin, the 24th pin detect that the 2nd pin of circuit, the 3rd pin, the 6th pin, the 7th are drawn with the space signal respectively
Foot, the 10th pin, the 11st pin, the 15th pin, the electrical connection of the 14th pin.
In this utility model preferably embodiment, the first logic inverter circuit is configured to 74LVC1G14 models
Chip, the second logic inverter circuit is configured to the chip of 74LVC1G14 models, and the logical AND gate circuit is configured to
The chip of 74LVC1G08 models, and the logic sum gate circuit is configured to the chip of 74LVC1G32GV models.
In this utility model preferably embodiment, the secondary signal outfan of the a-signal detection module, the B
The secondary signal outfan of signal detection module is electrically connected with the signal input part of the signal selection module, the signal choosing
The signal output part for selecting module is electrically connected with display terminal.
In this utility model preferably embodiment, the signal selection module is configured to the chip of TMDS250 models.
The beneficial effects of the utility model are：
A kind of video backup signal automatic switch-over circuit that this utility model is provided, is provided with a-signal detection module, B letters
Number detection module, signal selection module and logistic transformation module.When main signal breaks down dropout, circuit is cut automatically
Change to backup signal to show, when two paths of signals is normally input into, prioritizing selection main signal DVI1 is shown.A-signal is detected
Module, B signal detection module detect two input channels whether have signal input, then export corresponding low and high level signal to
Logistic transformation module, according to the priority that the major-minor input channel and passage of setting show, logistic transformation module carries out signal
Corresponding conversion, then output selects control signal, signal selection module to switch corresponding input according to control signal is selected
Signal to late-class circuit carries out signal processing and final display, so as to realize the automatic switchover of active and standby signal.This utility model
The video backup signal automatic switch-over circuit of offer using high level and low level, to main signal and backup signal, whether enter by failure
Row detection, the response time of signal redundancy switching is short, and accuracy rate is high, automatically switches so as to video backup signal has been effectively ensured
During stability and reliability.
Description of the drawings
Fig. 1 is a kind of overall frame of video backup signal automatic switch-over circuit that this utility model specific embodiment is provided
Frame figure；
Fig. 2 is the structural representation of the main signal input circuit that this utility model specific embodiment is provided；
Fig. 3 is the structural representation that the main signal that this utility model specific embodiment is provided detects circuit；
Fig. 4 is the structural representation of the space signal input circuit that this utility model specific embodiment is provided；
Fig. 5 is the structural representation that the space signal that this utility model specific embodiment is provided detects circuit；
Fig. 6 is the structural representation of the logistic transformation module that this utility model specific embodiment is provided；
Fig. 7 is the structural representation of the signal selection module that this utility model specific embodiment is provided.
In figure：
U1, a-signal detection module；U2, B signal detection module；U8, signal selection module；U7, logistic transformation module；U3、
First logic inverter circuit；U4, the second logic inverter circuit；U5, logical AND gate circuit；U6, logic sum gate circuit；U11, main letter
Number input circuit；U12, main signal detection circuit；U21, space signal input circuit；U22, space signal detection circuit.
Specific embodiment
Further illustrate the technical solution of the utility model below in conjunction with the accompanying drawings and by specific embodiment.
As shown in figure 1, a kind of video backup signal automatic switch-over circuit that the present embodiment is provided, including a-signal detection mould
Block U1, B signal detection module U2, logistic transformation module U7 and signal selection module U8, a-signal detection module U1, B signal inspection
Survey module U2, logistic transformation module U7 and signal selection module U8 to be sequentially connected electrically.A-signal detection module U1 is used for main signal
Collection and detection, B signal detection module U2 is used for backup signal and gathers and detect, signal selection module U8 is used to export and show
Control signal, logistic transformation module U7 is used to that the input signal of signal selection module U8 to be selected and controlled, and realizes video
The output of signal.Namely logistic transformation module U7 is collected after a-signal detection module U1, the detection signal of B signal detection module U2,
According to a series of logical operationss, generate and select control signal, by the output for selecting control signal control signal selecting module U8.
As shown in fig. 6, the logical operationss in order to realize logistic transformation module U7.Further technical scheme, logistic transformation
Module U7 includes the first logic inverter circuit U 3, the second logic inverter circuit U 4, logical AND gate circuit U 5 and logic sum gate electricity
Road U6, first signal output part of a-signal detection module U1 is electrically connected with the signal input part of the first logic inverter circuit U 3, B
First signal output part of signal detection module U2 signal input part, logic sum gate electricity respectively with the second logic inverter circuit U 4
The first signal input part electrical connection of road U6, the signal output part of the first logic inverter circuit U 3, the second logic inverter circuit U 4
Signal output part electrically connect with the signal input part of logical AND gate circuit U 5 first and secondary signal input respectively, logical AND gate
The signal output part of circuit U 5 is electrically connected with the secondary signal input of logic sum gate circuit U 6, and the signal of logical AND gate circuit U 5 is defeated
Go out end, the signal output part of logic sum gate circuit U 6 to electrically connect with logistic transformation module U7, second letter of a-signal detection module U1
Number outfan, the secondary signal outfan of B signal detection module U2 are electrically connected with the signal input part of signal selection module U8,
The signal output part of signal selection module U8 is electrically connected with display terminal.As shown in fig. 6, the major function of logistic transformation module U7
It is that signal selection module U8 that is converted to of output signal of a-signal detection module U1 and B signal detection module U2 selects control letter
Number, so as to control signal selecting module U8 switches over operation.Specifically, a-signal detection module U1, B signal detection module U2
Whether two input channels of detection have signal input, then export corresponding low and high level signal and give logistic transformation module U7, root
According to the priority that the major-minor input channel and passage of setting show, logistic transformation module U7 is accordingly changed signal, so
Output afterwards selects control signal, signal selection module U8 to switch corresponding input signal to rear class according to selection control signal
Circuit carries out signal processing and final display, so as to realize the automatic switchover of active and standby signal.This video backup signal is automatic
Using high level and low level, to main signal and backup signal, whether failure is detected switching circuit, and signal redundancy switching has
Response time is short, the features such as accuracy rate is high.
As shown in fig. 7, the first logic inverter circuit U 3 is configured to the chip of 74LVC1G14 models, the second logic inverter electricity
Road U4 is configured to the chip of 74LVC1G14 models, and the logical AND gate circuit U 5 is configured to the chip of 74LVC1G08 models, with
And the logic sum gate circuit U 6 is configured to the chip of 74LVC1G32GV models.
The logic translation table of logistic transformation module U7 is as follows：
‘1’：Represent that signal is normal；‘0’：Represent abnormal signal
The logic true value table of conversion can be drawn according to upper table
SEL1=A ' B '
SEL2=A ' B '+B
, by 2 above-mentioned logic inverters, a logical AND gate, a logic sum gate just can be real for logistic transformation module U7
The conversion of existing signal switch logic.
As shown in Figures 2 to 5, a-signal detection module U1 includes main signal input circuit U11 and is input into electricity with main signal
Road electrical connection main signal detection circuit U 12, B signal detection module U2 include space signal input circuit U21 and with standby letter
The space signal detection circuit U 22 of number input circuit electrical connection.A-signal detection module U1 is input into DVI1 main signals, B signal detection
Module U2 is input into DVI2 backup signals.
As shown in Figures 2 to 5, main signal input circuit U11 is configured to the DVI connector of JDRJ1-241L models, main letter
Number detection circuit U 12 is configured to the chip of MAX381CCM+ models, the pins of main signal input circuit U11 the 1st, the 2nd pin, the 6th
Pin, the 7th pin, the 17th pin, the 18th pin, the 23rd pin, the 24th pin detect respectively the 2nd of circuit U 12 with main signal
Pin, the 3rd pin, the 6th pin, the 7th pin, the 10th pin, the 11st pin, the 15th pin, the electrical connection of the 14th pin.Standby letter
Number input circuit U21 is configured to the DVI connector of JDRJ1-241L models, and space signal detection circuit U 22 is configured to
The chip of MAX381CCM+ models, the pins of space signal input circuit U21 the 1st, the 2nd pin, the 6th pin, the 7th pin, the 17th
Pin, the 18th pin, the 23rd pin, the 24th pin detect with space signal respectively the 2nd pin of circuit U 22, the 3rd pin, the 6th
Pin, the 7th pin, the 10th pin, the 11st pin, the 15th pin, the electrical connection of the 14th pin.Main signal input circuit U11 is received
Main signal, space signal input circuit U21 receive space signal, space signal input circuit U21, then by receive main signal,
Backup signal is transmitted to main signal detection circuit U 12, space signal detection circuit U 22 and detected.
As shown in Figure 3 and Figure 5, the DVI1_STATUS and DVI2_STATUS in figure represents respectively main signal and backup signal
Whether effectively, high level ' 1 ', invalid or abnormal output low level ' 0 ' are effectively exported.A-signal detection module U1 and B signal are detected
Module U2 output state combination table is as follows：
| Main DVI signal inputs 1 | Backup DVI signal inputs 2 | DVI_STATUS[1..0] |
| Normally | Normally | 2b’11 |
| Normally | It is abnormal | 2b’10 |
| It is abnormal | Normally | 2b’01 |
| It is abnormal | It is abnormal | 2b’00 |
As shown in fig. 7, signal selection module U8 is configured to the chip of TMDS250 models, the automatic switchover of signal finally by
Signal selection module U8 is completed.Signal selection module U8 has two input SEL1 and SEL2, and its value is defeated with logistic transformation module
Go out consistent.According to the change of status input signal, the switching of active and standby signal is finally completed, realizes the automatic switchover of signal.
Signal selection module U8 state table, it is as follows：
This utility model is described with reference to the preferred embodiments, and those skilled in the art know, without departing from this reality
In the case of with new spirit and scope, various changes or equivalence replacement can be carried out to these features and embodiment.This reality
It is not limited to the particular embodiment disclosed with new, other embodiments fallen in claims hereof all belong to
In the scope of this utility model protection.
Claims (7)
1. a kind of video backup signal automatic switch-over circuit, it is characterised in that：
The B signal for gathering including the a-signal detection module (U1) for gathering for main signal and detecting, for backup signal and detecting
Detection module (U2), for output and display control signal signal selection module (U8) and for generate select control letter
Number logistic transformation module (U7)；
The a-signal detection module (U1), the B signal detection module (U2), the logistic transformation module (U7) and described
Signal selection module (U8) is sequentially connected electrically.
2. video backup signal automatic switch-over circuit according to claim 1, it is characterised in that：
The logistic transformation module includes the first logic inverter circuit (U3), the second logic inverter circuit (U4), logical AND gate electricity
Road (U5) and logic sum gate circuit (U6)；
The signal input of the first signal output part of the a-signal detection module (U1) and the first logic inverter circuit (U3)
End electrical connection, the first signal output part of the B signal detection module (U2) respectively with the second logic inverter circuit (U4)
Signal input part, the logic sum gate circuit (U6) the first signal input part electrical connection, the first logic inverter circuit
(U3) signal output part, the signal output part of the second logic inverter circuit (U4) respectively with the logical AND gate circuit
(U5) the first signal input part and the electrical connection of secondary signal input, the signal output part of the logical AND gate circuit (U5) and institute
The electrical connection of logic sum gate circuit (U6) secondary signal input is stated, it is the signal output part of the logical AND gate circuit (U5), described
Logic sum gate circuit (U6) signal output part is electrically connected with the logistic transformation module (U7).
3. video backup signal automatic switch-over circuit according to claim 1, it is characterised in that：
The a-signal detection module (U1) includes main signal input circuit (U11) and electrically connects with the main signal input circuit
Main signal detection circuit (U12)；
The B signal detection module (U2) include space signal input circuit (U21) and with the space signal input circuit electricity
Space signal detection circuit (U22) of connection.
4. video backup signal automatic switch-over circuit according to claim 3, it is characterised in that：
The main signal input circuit (U11) is configured to DVI connector, and main signal detection circuit (U12) is configured to
The chip of MAX381CCM+ models；
The pin of main signal input circuit (U11) the 1st, the 2nd pin, the 6th pin, the 7th pin, the 17th pin, the 18th pin,
23rd pin, the 24th pin detect respectively the 2nd pin of circuit (U12), the 3rd pin with the main signal, the 6th pin, the 7th draw
Foot, the 10th pin, the 11st pin, the 15th pin, the electrical connection of the 14th pin；
The space signal input circuit (U21) is configured to DVI connector, and space signal detection circuit (U32) is configured to
The chip of MAX381CCM+ models；
The pin of space signal input circuit (U21) the 1st, the 2nd pin, the 6th pin, the 7th pin, the 17th pin, the 18th are drawn
Foot, the 23rd pin, the 24th pin respectively with the space signal detect circuit (U22) the 2nd pin, the 3rd pin, the 6th pin,
7th pin, the 10th pin, the 11st pin, the 15th pin, the electrical connection of the 14th pin.
5. video backup signal automatic switch-over circuit according to claim 2, it is characterised in that：
The first logic inverter circuit (U3) is configured to the chip of 74LVC1G14 models, the second logic inverter circuit
(U4) chip of 74LVC1G14 models is configured to, the logical AND gate circuit (U5) is configured to the chip of 74LVC1G08 models,
And the logic sum gate circuit (U6) is configured to the chip of 74LVC1G32GV models.
6. video backup signal automatic switch-over circuit according to claim 2, it is characterised in that：
The secondary signal outfan of the a-signal detection module (U1), the secondary signal output of the B signal detection module (U2)
End electrically connects with the signal input part of the signal selection module (U8)；
The signal output part of the signal selection module (U8) is electrically connected with display terminal.
7. video backup signal automatic switch-over circuit according to claim 1, it is characterised in that：
The signal selection module (U8) is configured to the chip of TMDS250 models.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621017462.5U CN206117845U (en) | 2016-08-31 | 2016-08-31 | Spare signal automatic switch -over circuit of video |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621017462.5U CN206117845U (en) | 2016-08-31 | 2016-08-31 | Spare signal automatic switch -over circuit of video |
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| Publication Number | Publication Date |
|---|---|
| CN206117845U true CN206117845U (en) | 2017-04-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621017462.5U Expired - Fee Related CN206117845U (en) | 2016-08-31 | 2016-08-31 | Spare signal automatic switch -over circuit of video |
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| Country | Link |
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| CN (1) | CN206117845U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107948106A (en) * | 2017-11-23 | 2018-04-20 | 盛科网络（苏州）有限公司 | A kind of method and apparatus of the main power board of selection for interchanger |
| CN110718181A (en) * | 2018-07-12 | 2020-01-21 | 杭州海康威视数字技术股份有限公司 | Signal source backup method, device and system and LED controller |
-
2016
- 2016-08-31 CN CN201621017462.5U patent/CN206117845U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107948106A (en) * | 2017-11-23 | 2018-04-20 | 盛科网络（苏州）有限公司 | A kind of method and apparatus of the main power board of selection for interchanger |
| CN110718181A (en) * | 2018-07-12 | 2020-01-21 | 杭州海康威视数字技术股份有限公司 | Signal source backup method, device and system and LED controller |
| CN110718181B (en) * | 2018-07-12 | 2021-09-21 | 杭州海康威视数字技术股份有限公司 | Signal source backup method, device and system and LED controller |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
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Granted publication date: 20170419 Termination date: 20200831 |