CN207924500U - A kind of the protection circuit and control system of programmable logic chip - Google Patents
A kind of the protection circuit and control system of programmable logic chip Download PDFInfo
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- CN207924500U CN207924500U CN201820198240.0U CN201820198240U CN207924500U CN 207924500 U CN207924500 U CN 207924500U CN 201820198240 U CN201820198240 U CN 201820198240U CN 207924500 U CN207924500 U CN 207924500U
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- programmable logic
- logic chip
- protection circuit
- switching tube
- feedback
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Abstract
This application discloses the protection circuit and control system of a kind of programmable logic chip, the input terminal of the protection circuit and the output end of central processing element connect；The input terminal of the output end and programmable logic chip of protecting circuit connects；The feedback end of the control terminal and programmable logic chip of protecting circuit connects；It includes switching tube and resistance to protect circuit; one end of resistance receives the first reference voltage; the other end of resistance is connect with the first end of the input terminal of programmable logic chip and switching tube respectively; the second end of switching tube and the output end of central processing element connect, and the third end of switching tube and the feedback end of programmable logic chip connect.The application can avoid leading to programmable logic chip loading procedure again since central processing element fails, and then avoid that entire control system is caused to fail, and ensure job safety.
Description
Technical field
This application involves the technical field of Industry Control, it is related to protection circuit and the control system of a kind of programmable logic chip
System.
Background technology
As shown in Figure 1, the control system 10 of the prior art include central processing element 101, programmable logic chip 102 with
And memory 103, central processing element 101 are connect with programmable logic chip 102 and memory 103 respectively, programmable logic
Chip 102 is for backing up central processing element 101, to ensure that control system 10 works normally.
When central processing element 101 works normally, central processing element 101 controls programmable logic by controlling signal
Chip 102 enters loading mode, and the program read from memory 103 loads programmable logic chip 102.In
When processing chip 101 being entreated to fail, the control signal that central processing element 101 exports becomes to survey, and can lead to programmable logic
Chip 102 enters back into loading mode after having loaded program, so that programmable logic chip 102 fails, therefore control system 10
Disabler.
Utility model content
In order to solve the above problem existing for the control system of the prior art, the application provides a kind of programmable logic chip
Protection circuit and control system.
To solve the above problems, the embodiment of the present application provides a kind of protection circuit of programmable logic chip, difference
Connect central processing element and programmable logic chip, the output of the input terminal and the central processing element of the protection circuit
End connection, for receiving first control signal from the central processing element；The output end of the protection circuit is compiled with described
The input terminal of journey logic chip connects；The control terminal of the protection circuit is connect with the feedback end of the programmable logic chip,
Wherein：The protection circuit includes switching tube and resistance, and one end of the resistance receives the first reference voltage, the resistance it is another
One end is connect with the first end of the input terminal of the programmable logic chip and the switching tube respectively, and the second of the switching tube
End is connect with the output end of the central processing element, the feedback at the third end and the programmable logic chip of the switching tube
End connection.
Wherein, the protection circuit includes first resistor, the control terminal of the protection circuit and the programmable logic core
The feedback end of piece is grounded by the first resistor.
Wherein, the switching tube is PNP type triode, and the first end of the switching tube is the emitter of the triode,
The second end of the switching tube is the base stage of the triode, and the third end of the switching tube is the collector of the triode.
Wherein, in the programmable logic chip loading procedure, the control terminal of the protection circuit may be programmed from described
The feedback end of logic chip receives the first feedback signal, and the protection circuit is according to first feedback signal by described first
Control signal is sent to the programmable logic chip, and the programmable logic chip is according to the first control signal from described
Central processing element receives described program, and loads described program；After the programmable logic chip loading procedure, the guarantor
The control terminal of protection circuit receives the second feedback signal from the feedback end of the programmable logic chip, the protection circuit according to
Two feedback signal and the first control signal generate second control signal, and the programmable logic chip receives described
Second control signal stops receiving described program according to the second control signal.
Wherein, in the programmable logic chip loading procedure, the first control signal be low level, described first
Feedback signal is low level, the switching tube conducting；After the completion of the programmable logic chip loading procedure, described second is anti-
Feedback signal is high level, and the switching tube cut-off, the second control signal is high level.
In order to solve the above technical problems, another technical solution that the application uses is：A kind of control system is provided, until
Include less：Memory, for storing program；Central processing element is connect with the memory；Protect circuit, the protection electricity
The input terminal on road is connect with the output end of the central processing element, for receiving the first control letter from the central processing element
Number；The output end of programmable logic chip, the protection circuit is connect with the input terminal of the programmable logic chip, the guarantor
The control terminal of protection circuit is connect with the feedback end of the programmable logic chip；The protection circuit includes switching tube and resistance,
One end of the resistance receives the first reference voltage, the other end input with the programmable logic chip respectively of the resistance
End is connected with the first end of the switching tube, and the second end of the switching tube is connect with the output end of the central processing element,
The third end of the switching tube is connect with the feedback end of the programmable logic chip.
Wherein, the protection circuit includes first resistor, the control terminal of the protection circuit and the programmable logic core
The feedback end of piece is grounded by the first resistor.
Wherein, the switching tube is PNP type triode, and the first end of the switching tube is the emitter of the triode,
The second end of the switching tube is the base stage of the triode, and the third end of the switching tube is the collector of the triode.
Wherein, in the programmable logic chip loading procedure, the control terminal of the protection circuit may be programmed from described
The feedback end of logic chip receives the first feedback signal, and the protection circuit is according to first feedback signal by described first
Control signal is sent to the programmable logic chip, and the programmable logic chip is according to the first control signal from described
Central processing element receives described program, and loads described program；After the programmable logic chip loading procedure, the guarantor
The control terminal of protection circuit receives the second feedback signal from the feedback end of the programmable logic chip, the protection circuit according to
Two feedback signal and the first control signal generate second control signal, and the programmable logic chip receives described
Second control signal stops receiving described program according to the second control signal.
Wherein, in the programmable logic chip loading procedure, the first control signal be low level, described first
Feedback signal is low level, the switching tube conducting；After the completion of the programmable logic chip loading procedure, described second is anti-
Feedback signal is high level, and the switching tube cut-off, the second control signal is high level.
Compared with prior art, which is separately connected central processing element and programmable logic chip, protection electricity
The input terminal on road and the output end of central processing element connect, for receiving first control signal from central processing element；Protection
The output end of circuit and the input terminal of programmable logic chip connect；Protect circuit control terminal and programmable logic chip it is anti-
Present end connection；Protection circuit includes switching tube and resistance, and one end of resistance receives the first reference voltage, the other end difference of resistance
Connect with the first end of the input terminal of programmable logic chip and switching tube, the second end of switching tube and central processing element it is defeated
Outlet connects, and the third end of switching tube and the feedback end of programmable logic chip connect；In programmable logic chip loading procedure
After the completion, it protects the control terminal of circuit to receive the second feedback signal from the feedback end of programmable logic chip, protects circuit root
Second control signal is generated according to the second feedback signal and first control signal, programmable logic chip receives the second control letter
Number, stopped receiving program according to second control signal, can avoid leading to programmable logic since central processing element fails
Chip loading procedure again, and then avoid that entire control system is caused to fail, ensure job safety.
Description of the drawings
In order to more clearly explain the technical solutions in the embodiments of the present application, it is adopted required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is only some embodiments of the present application, for
For those of ordinary skill in the art, without creative efforts, other are can also be obtained according to these attached drawings
Attached drawing.Wherein：
Fig. 1 is the block schematic illustration of the control system of the prior art；
Fig. 2 is the block schematic illustration of the control system of the application first embodiment；
Fig. 3 is the circuit diagram that circuit is protected in Fig. 2.
Specific implementation mode
With reference to the accompanying drawings and examples, the application is described in further detail.It is emphasized that following implement
Example is merely to illustrate the application, but is not defined to scope of the present application.Likewise, following embodiment is only the portion of the application
Point embodiment and not all embodiments, the institute that those of ordinary skill in the art are obtained without creative efforts
There are other embodiments, shall fall in the protection scope of this application.
Term " first ", " second ", " third " " in the description and claims of this application and above-mentioned attached drawing
The (if present)s such as four " are for distinguishing similar object, without being used to describe specific sequence or precedence.It should manage
The data that solution uses in this way can be interchanged in the appropriate case, so as to embodiments herein described herein, such as can be with
Sequence other than those of illustrating or describing herein is implemented.In addition, term " comprising " and " having " and their times
What is deformed, it is intended that cover it is non-exclusive include, for example, contain the process of series of steps or unit, method, system,
Product or equipment those of are not necessarily limited to clearly to list step or unit, but may include not listing clearly or for
The intrinsic other steps of these processes, method, product or equipment or unit.
Shown in Figure 2, Fig. 2 is the block schematic illustration of the control system of the application first embodiment.The present embodiment institute
The protection circuit 21 of announcement is applied to control system 20, and protection circuit 21 is separately connected the central processing element 22 of control system 20
With programmable logic chip 23.Wherein, the control system 20 of the application can be applied in industrial robot, for controlling industrial machine
Device people；Since industrial robot needs to work under complicated electromagnetic environment, and control system 20 is believed by serious electromagnetism
Number interference when, the central processing element 22 of control system 20 may be caused to fail.Therefore, the application protects circuit 21 by setting
It protects programmable logic chip 23 by other effect of signals, not fail to avoid programmable logic chip 23, and then ensures operation
Safety.
Wherein, the input terminal 211 of protection circuit 21 is connect with the output end 221 of central processing element 22, is used for from center
Processing chip 22 receives first control signal；Protect the input terminal 231 of the output end 212 and programmable logic chip 23 of circuit 21
The control terminal 213 of connection, protection circuit 21 is connect with the feedback end 232 of programmable logic chip 23, is used for from programmable logic
Chip 23 receives feedback signal.Since programmable logic chip 23 does not have memory, programmable logic chip 23 is in power down
In the case of can not save routine, and then programmable logic chip 23 is needed after the power is turned on from external load program every time.Wherein, in
First output end 222 of centre processing chip 22 is connect with the first input end 233 of programmable logic chip 23；In control system 20
After the power is turned on, central processing element 22 by the first input end 233 of the first output end 222 and programmable logic chip 23 by program
It is sent to programmable logic chip 23, programmable logic chip 23 loads the program.
The operation principle of protection circuit 21 described in detail below：
In 23 loading procedure of programmable logic chip, protection circuit 21 obtains the first control letter from central processing element 22
Number and obtain the first feedback signal from programmable logic chip 23, and first control signal is sent to according to the first feedback signal
Programmable logic chip 23, programmable logic chip 23 is according to first control signal loading procedure, i.e., in programmable logic chip
After 23 input terminal 231 receives first control signal, central processing element 22 passes through the first output end 222 and programmable logic
Program is sent to programmable logic chip 23,23 loading procedure of programmable logic chip by the first input end 233 of chip 23.
Wherein, the first feedback signal is the first level.
After the completion of 23 loading procedure of programmable logic chip, protection circuit 21 obtains second from programmable logic chip 23
Feedback signal, and second control signal is generated according to the second feedback signal and first control signal, programmable logic chip 23
Input terminal 231 receives second control signal, and programmable logic chip 23 controls first input end 233 according to second control signal
Stop receiving the program that the first output end 222 of central processing element 22 is sent.Wherein, the second feedback signal is second electrical level.
Control system 20 further comprises that memory 24, central processing element 22 are connect with memory 24, and memory 24 is used
In storage above procedure.In 23 loading procedure of programmable logic chip, central processing element 22 obtains program from memory 24.
In addition, central processing element 22 can also include online upgrade port 223, the online upgrading of central processing element 22
Port 223 is connect with server 25, and in 23 loading procedure of programmable logic chip, central processing element 22 can be by rising online
Grade port 223 obtains the online upgrading packet of program from server 25, and programmable logic chip 23 is received from central processing element 22
To online upgrading packet, and the root online upgrading packet realizes online upgrading to program.
The application after the completion of 23 loading procedure of programmable logic chip, the input terminal 231 of programmable logic chip 23 from
Protection circuit 21 receives second control signal, and programmable logic chip 23 controls first input end according to second control signal
233 stop receiving the program that the first output end 222 of central processing element 22 is sent, and avoid failing due to central processing element 22
And lead to the loading procedure again of programmable logic chip 23, it avoids that entire control system 20 is caused to fail, ensures job safety.
As shown in figure 3, the revealed protection circuit 21 of the present embodiment includes first resistor R1, resistance R2 and switching tube 55,
The second end 552 of switching tube 55 is to protect the input terminal 211 of circuit 21, and the third end 553 of switching tube 55 is protection circuit 21
Control terminal 213, the first end 551 of switching tube 55 are to protect the output end 212 of circuit 21.
Wherein, the second end 552 of switching tube 55 is connect with the output end 221 of central processing element 22, and the of switching tube 55
Three ends 553 are connect with the feedback end 232 of programmable logic chip 23；One end of resistance R2 receives the first reference voltage VCC, resistance
The other end of R2 is connect with the input terminal 231 of the first end of switching tube 55 551 and programmable logic chip 23 respectively；First resistor
The feedback end 232 of one end connection programmable logic chip 23 of R1, the other end ground connection of first resistor R1.
The switching tube 55 of the present embodiment can be PNP type triode, and the wherein first end 551 of switching tube 55 is the hair of triode
Emitter-base bandgap grading, the second end 552 of switching tube 55 are the base stage of triode, and the third end 553 of switching tube 55 is the collector of triode.
In other embodiment, switching tube 55 can be other types switching tube, such as switching tube 55 can be metal-oxide-semiconductor.
In 23 loading procedure of programmable logic chip, the feedback end 232 of programmable logic chip 23 is in high-impedance state,
I.e. the feedback end 232 of programmable logic chip 23 neither exports high level nor exports low level；Programmable logic chip at this time
23 feedback end 232 is grounded by first resistor R1, the first feedback signal of the output of feedback end 232 of programmable logic chip 23
For low level, the first control signal that the output end 221 of central processing element 22 exports is low level, and switching tube 55 is led at this time
It is logical, protect the voltage of the output of circuit 21 to meet following formula：
V1=(VCC-VCE)*R1/(R1+R2)
Wherein, VCEFor the conducting voltage of switching tube 55.By the way that the resistance value of the resistance value and resistance R2 of first resistor R1 is arranged, with
So that the output end 212 of protection circuit 21 is exported low level, therefore circuit 21 is protected to be believed the first control according to the first feedback signal
Number be sent to programmable logic chip 23, programmable logic chip 23 according to first control signal by first input end 233 from
Central processing element 22 receives program, 23 loading procedure of programmable logic chip.
After the completion of 23 loading procedure of programmable logic chip, the feedback end 232 of programmable logic chip 23 exports high electricity
Flat, i.e. the second feedback signal is high level；Switching tube 55 ends at this time, i.e., switching tube 55 is stopped, and protects the defeated of circuit 21
The voltage that outlet 212 exports is VCC, i.e., second control signal is high level；Programmable logic chip 23 is believed according to the second control
Number control first input end 233 stop receive central processing element 22 the first output end 222 send program, avoid due in
Centre processing chip 22 fails and leads to the loading procedure again of programmable logic chip 23, avoids that entire control system 20 is caused to lose
Effect ensures job safety.
The application further provides for a kind of control system, as shown in Fig. 2, the revealed control system of the present embodiment 20 includes
Memory 24, central processing element 22, protection circuit 21 and programmable logic chip 23, wherein central processing element 22 with deposit
Reservoir 24 connects, and protection circuit 21 is connect with central processing element 22 and programmable logic chip 23 respectively, the protection circuit 21
For the protection circuit of above-described embodiment, details are not described herein.
In conclusion the protection circuit of the application is separately connected central processing element and programmable logic chip, protection electricity
The input terminal on road and the output end of central processing element connect, for receiving first control signal from central processing element；Protection
The output end of circuit and the input terminal of programmable logic chip connect；Protect circuit control terminal and programmable logic chip it is anti-
Present end connection；Protection circuit includes switching tube and resistance, and one end of resistance receives the first reference voltage, the other end difference of resistance
Connect with the first end of the input terminal of programmable logic chip and switching tube, the second end of switching tube and central processing element it is defeated
Outlet connects, and the third end of switching tube and the feedback end of programmable logic chip connect；In programmable logic chip loading procedure
After the completion, it protects the control terminal of circuit to receive the second feedback signal from the feedback end of programmable logic chip, protects circuit root
Second control signal is generated according to the second feedback signal and first control signal, programmable logic chip receives the second control letter
Number, stopped receiving program according to second control signal, can avoid leading to programmable logic since central processing element fails
Chip loading procedure again, and then avoid that entire control system is caused to fail, ensure job safety.
It should be noted that the above various embodiments belongs to same inventive concept, the description of each embodiment emphasizes particularly on different fields,
Not detailed place, can refer to the description in other embodiment described in separate embodiment.
The foregoing is merely presently filed embodiments, are not intended to limit the scope of the claims of the application, every to utilize this
Equivalent structure or equivalent flow shift made by application specification and accompanying drawing content, it is relevant to be applied directly or indirectly in other
Technical field includes similarly in the scope of patent protection of the application.
Claims (10)
1. a kind of protection circuit of programmable logic chip, which is characterized in that the protection circuit is separately connected central processing core
Piece and programmable logic chip, it is described protection circuit input terminal connect with the output end of the central processing element, be used for from
The central processing element receives first control signal；The output end of the protection circuit is defeated with the programmable logic chip
Enter end connection；The control terminal of the protection circuit is connect with the feedback end of the programmable logic chip, wherein：
The protection circuit includes switching tube and resistance, and one end of the resistance receives the first reference voltage, the resistance it is another
One end is connect with the first end of the input terminal of the programmable logic chip and the switching tube respectively, and the second of the switching tube
End is connect with the output end of the central processing element, the feedback at the third end and the programmable logic chip of the switching tube
End connection.
2. protection circuit according to claim 1, which is characterized in that the protection circuit includes first resistor, the guarantor
The feedback end of the control terminal of protection circuit and the programmable logic chip is grounded by the first resistor.
3. protection circuit according to claim 2, which is characterized in that the switching tube is PNP type triode, the switch
The first end of pipe is the emitter of the triode, and the second end of the switching tube is the base stage of the triode, the switch
The third end of pipe is the collector of the triode.
4. protection circuit according to claim 3, which is characterized in that in the programmable logic chip loading procedure,
The control terminal of the protection circuit receives the first feedback signal, the protection electricity from the feedback end of the programmable logic chip
The first control signal is sent to the programmable logic chip by road according to first feedback signal, and described may be programmed is patrolled
It collects chip and described program is received from the central processing element according to the first control signal, and load described program；Institute
After stating programmable logic chip loading procedure, the control terminal of the protection circuit is terminated from the feedback of the programmable logic chip
The second feedback signal is received, the protection circuit generates the second control according to two feedback signal and the first control signal
Signal, the programmable logic chip receive the second control signal, are stopped receiving institute according to the second control signal
State program.
5. protection circuit according to claim 4, which is characterized in that in the programmable logic chip loading procedure,
The first control signal is low level, and first feedback signal is low level, the switching tube conducting；Described programmable
After the completion of logic chip loading procedure, second feedback signal is high level, the switching tube cut-off, the second control letter
Number be high level.
6. a kind of control system, which is characterized in that the control system includes at least：
Memory, for storing program；
Central processing element is connect with the memory；
Circuit, the input terminal of the protection circuit is protected to connect, be used for from described with the output end of the central processing element
Processing chip is entreated to receive first control signal；
The output end of programmable logic chip, the protection circuit is connect with the input terminal of the programmable logic chip, described
The control terminal of protection circuit is connect with the feedback end of the programmable logic chip；
The protection circuit includes switching tube and resistance, and one end of the resistance receives the first reference voltage, the resistance it is another
One end is connect with the first end of the input terminal of the programmable logic chip and the switching tube respectively, and the second of the switching tube
End is connect with the output end of the central processing element, the feedback at the third end and the programmable logic chip of the switching tube
End connection.
7. control system according to claim 6, which is characterized in that the protection circuit includes first resistor, the guarantor
The feedback end of the control terminal of protection circuit and the programmable logic chip is grounded by the first resistor.
8. control system according to claim 7, which is characterized in that the switching tube is PNP type triode, the switch
The first end of pipe is the emitter of the triode, and the second end of the switching tube is the base stage of the triode, the switch
The third end of pipe is the collector of the triode.
9. control system according to claim 8, which is characterized in that in the programmable logic chip loading procedure,
The control terminal of the protection circuit receives the first feedback signal, the protection electricity from the feedback end of the programmable logic chip
The first control signal is sent to the programmable logic chip by road according to first feedback signal, and described may be programmed is patrolled
It collects chip and described program is received from the central processing element according to the first control signal, and load described program；Institute
After stating programmable logic chip loading procedure, the control terminal of the protection circuit is terminated from the feedback of the programmable logic chip
The second feedback signal is received, the protection circuit generates the second control according to two feedback signal and the first control signal
Signal, the programmable logic chip receive the second control signal, are stopped receiving institute according to the second control signal
State program.
10. control system according to claim 9, which is characterized in that in the programmable logic chip loading procedure,
The first control signal is low level, and first feedback signal is low level, the switching tube conducting；Described programmable
After the completion of logic chip loading procedure, second feedback signal is high level, the switching tube cut-off, the second control letter
Number be high level.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820198240.0U CN207924500U (en) | 2018-02-02 | 2018-02-02 | A kind of the protection circuit and control system of programmable logic chip |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820198240.0U CN207924500U (en) | 2018-02-02 | 2018-02-02 | A kind of the protection circuit and control system of programmable logic chip |
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| CN207924500U true CN207924500U (en) | 2018-09-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109313427A (en) * | 2018-02-02 | 2019-02-05 | 深圳配天智能技术研究院有限公司 | A kind of the protection circuit and control system of programmable logic chip |
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2018
- 2018-02-02 CN CN201820198240.0U patent/CN207924500U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109313427A (en) * | 2018-02-02 | 2019-02-05 | 深圳配天智能技术研究院有限公司 | A kind of the protection circuit and control system of programmable logic chip |
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