CN101893848A - Method for realizing failure safety by power cutoff - Google Patents
Method for realizing failure safety by power cutoff Download PDFInfo
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- CN101893848A CN101893848A CN 201010235352 CN201010235352A CN101893848A CN 101893848 A CN101893848 A CN 101893848A CN 201010235352 CN201010235352 CN 201010235352 CN 201010235352 A CN201010235352 A CN 201010235352A CN 101893848 A CN101893848 A CN 101893848A
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- 239000004065 semiconductor Substances 0.000 description 5
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Abstract
The invention discloses a method for realizing failure safety by power cutoff, which comprises the following steps: establishing two parallel power supply subcircuits for a controlled system, namely a power-on start-normal cut-off subcircuit and a safety cut-off subcircuit; in the power-on reset process, conducting the control switch of the power-on start-normal cut-off subcircuit so as to supply power to the controlled system; judging whether the working state of the controlled system is normal according to a state indication signal by a state recognition module, if so, conducting the control switch of the safety cut-off subcircuit, and establishing a power supply to supply power to the controlled system; after conducting the safety cut-off subcircuit and delaying for some time, disconnecting the control switch of the power-on start-normal cut-off subcircuit by a reset/delay control module; and monitoring the state of the controlled system by the state recognition module in real time, and outputting a cut-off signal to disconnect the control switch of the safety cut-off subcircuit when the state indication signal indicates abnormal operation of the controlled system. The method can thoroughly eliminate potential safety hazard.
Description
Technical field
The present invention relates to computer control system and method field, particularly relate to and a kind ofly realize fail-safe method by power cutoff.
Background technology
A large amount of uses along with computer control system, in the relevant control field of some safety, the security-related equipment or the state of system must be controlled the monitor closely of equipment, even when opertaing device breaks down, also must make controlled device failure to the safe side side, satisfy the fail-safe principle.
The Chinese patent ZL2007100643059 that name is called " safety cut-off method of exporting in the three-mould redundancy safety computer and device " proposes a kind of method of safe shutdown fail-safe computer output, occurs the hazardous side that also can not lead under the wrong situation even guarantee the voting output of triplication redundancy system in module.Output when this method forces module to be made mistakes is set to the safety value of prior appointment, and this lock-on circuit itself also is safe simultaneously, and the Shi Buhui that promptly breaks down makes the export orientation hazardous side of system.
Though the method that patent ZL2007100643059 proposes has solved the situation of the mistake accumulation that may occur in the conventional art, wrong module promptly occurs and in time be not excluded out whole triplication redundancy system, thereby the problem of influence voting output, but its range of application only limits to the three-mould redundancy safety computer control system, range of application has bigger restriction, versatility is relatively poor, safe shutdown has also just cut off the output of triplication redundancy system simultaneously, can't realize there is certain potential safety hazard in the requirement of triplication redundancy control system self outage.
Summary of the invention
(1) technical matters that will solve
The technical problem to be solved in the present invention is how can thoroughly eliminate safe hidden trouble, and realizes failure safe.
(2) technical scheme
For solving the problems of the technologies described above, provide a kind of and realize fail-safe method by power cutoff, comprise step:
S1, for controlled system is set up the power supply branch road of two parallel connections, the power supply branch road of described two parallel connections is electrifying startup-normal turn-off branch road and safe shutdown branch road;
S2, the gauge tap of the described electrifying startup of conducting-normal turn-off branch road during electrification reset is given described controlled system power supply;
S3 judges by condition indicative signal whether the duty of controlled system is normal by the state recognition module, if then the gauge tap of conducting safe shutdown branch road is set up power supply and given described controlled system power supply;
S4, the conducting of described safe shutdown branch road and postpone certain hour after, disconnect the gauge tap of described electrifying startup-normal turn-off branch road by the control module that resets/postpone;
S5 monitors the state of controlled system in real time by described state recognition module, when condition indicative signal shows the controlled system operation exception, then exports the gauge tap that cut-off signals disconnects described safe shutdown branch road.
Preferably, the status signal of exporting during the controlled system operate as normal is the level signal that changes in the cycle, and whether the status signal that described state recognition module is sent by decoding circuit identification controlled system is normal.
Preferably, when the state recognition module detects less than status signal or decodes when unusual, judge that the duty of controlled system occurs unusual.
Preferably, described resetting/postpone control module realizes conducting and disconnection to the gauge tap of described electrifying startup-normal turn-off branch road by trigger.
Preferably, the gauge tap of described electrifying startup-normal turn-off branch road and/or described safe shutdown branch road is a photoelectric relay.
Preferably, the gauge tap of described electrifying startup-normal turn-off branch road and/or described safe shutdown branch road adopts pliotron to make.
Preferably, the gauge tap of described electrifying startup-normal turn-off branch road and/or described safe shutdown branch road adopts power MOS pipe to make.
(3) beneficial effect
The present invention has adopted the power supply of direct cut-out controlled system to realize fail-safe method, turn-offs output than general passing through and realizes fail-safe method, has eliminated potential safety hazard more up hill and dale; Replace the normal operating conditions that the signal that overturns is indicated controlled system by high-low level, can distinguish mutually, improved the security of state recognition module with output signal solid " 0 " or solid " 1 " mistake that the digital circuit inefficacy brings.
Description of drawings
Fig. 1 is that the embodiment of the invention realizes fail-safe theory diagram by power cutoff;
Fig. 2 is that the embodiment of the invention realizes fail-safe workflow diagram by power cutoff;
Fig. 3 is the schematic diagram of the control module that resets/postpone of the embodiment of the invention;
Fig. 4 is that the embodiment of the invention uses pliotron to realize the schematic diagram of electronic switch;
Fig. 5 is the switch and the control circuit cascaded structure synoptic diagram of the embodiment of the invention;
Fig. 6 is the switch and the control circuit 4 mould redundancy structure synoptic diagram of the embodiment of the invention.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used to illustrate the present invention, but are not used for limiting the scope of the invention.
In order to realize arriving fail-safe purpose, two power supply branch roads are provided for controlled system in the technical scheme of the present invention: electrifying startup-normal turn-off branch road and safe shutdown branch road by power cutoff.The schematic diagram of implementation method as shown in Figure 1.Two power supply branch roads are formed in parallel, and provide power supply for controlled system jointly.During any one branch road operate as normal, can finish work in two branch roads, make the controlled system operate as normal to the controlled system power supply.
Electrifying startup-normal turn-off branch road is the power supply branch road that system initially powers on or can conducting when resetting; The safe shutdown branch road is the power supply branch road that controlled system can be kept when normally moving.In order to reach when detecting the controlled system fault, the design object of its power supply of safety cut-off must make two power supply branch roads disconnect simultaneously.By satisfying such design object to logical relation design between two power supply branch roads.
In the systematic schematic diagram shown in Figure 1, when electrification reset, set up power supply, provide power supply to controlled system by electrifying startup-normal turn-off branch road.Output state indicator signal after controlled system powers on, the state recognition module judges by condition indicative signal whether the duty of controlled system is normal.When controlled system was working properly, the gauge tap 1 of the Continuity signal meeting conducting safe shutdown branch road that the state recognition module generates was set up power supply and is powered to controlled system.This moment, two power supply branch roads were powered to controlled system simultaneously.After the conducting of safe shutdown branch road postponed the regular hour simultaneously, the control module that resets/postpone meeting automatic cutout switch 2 cut off electrifying startup-normal turn-off branch road, and only power to controlled system by the safe shutdown branch road this moment.In case controlled system breaks down, normal output state indicator signal, state recognition module so will in time identify the unusual of controlled system, output cut-off signals gauge tap 1 disconnects the safe shutdown branch road, this moment, all provided the branch road of power supply all to be disconnected to controlled system, made the total system failure to the safe side.The process flow diagram of system works as shown in Figure 2.
The state recognition module is finished the judgement to the controlled system duty.In order to realize fail-safe purpose, avoid taking place the mistake of solid " 0 " or solid " 1 ", the level signal that the output cycle changes when requiring the controlled system operate as normal.Whether the state recognition module is discerned the status signal that controlled system sends by decoding circuit normal.When the controlled system operate as normal, the switch of this power supply branch road of state recognition module meeting conducting is kept system's operate as normal.Be called SVCC through the power supply behind the switch.When the state recognition module detects less than status signal or decodes and can judge that all the duty of controlled system has occurred unusually when unusual, thus disconnection safe shutdown branch road.
Resetting/postpone, actuating switch 2 is to the controlled system power supply when initially powering on or resetting for control module, and after the controlled system operate as normal, gauge tap 2 disconnects again, so that realize fail-safe function.The control module that resets/postpone can use trigger to realize.Fig. 3 has provided preferred use d type flip flop realize resetting/the postpone schematic diagram of control function.
The RESET signal makes switch 2 conductings power to controlled system to d type flip flop set during electrification reset, and after the controlled system operate as normal, 1 conducting of state recognition module controls switch is set up SVCC.After postponing, SVCC latchs " 0 " as the clock of d type flip flop closes switch 2, and only power to controlled system by switch 1 this moment.In case controlled system appearance mistake causes no longer exporting the cycle variable signal of representing operate as normal and switch 1 cuts out, thereby whole controlled system power supply is switched off.
For power switch, can select mechanical relay, photoelectric relay or use large power triode voluntarily or metal-oxide-semiconductor design electronic switch.The advantage of mechanical relay is that conducting resistance is little, but its switch life with by current related, and the life-span is short relatively, big electric current model costs an arm and a leg.Photoelectric relay control is simple, but big electric current model costs an arm and a leg.Use large power triode or metal-oxide-semiconductor design electronic switch then not have above-mentioned shortcoming, therefore preferred large power triode or metal-oxide-semiconductor are realized the function of electronic switch.Fig. 4 has provided and has used large power triode to realize the schematic diagram of electronic switch.When the control end signal is high level, triode 1 and triode 2 conductings simultaneously, electronic switch is in conducting state; When the control end signal was low level, triode 1 and triode 2 ended simultaneously, and electronic switch is in off-state.
Switch and corresponding control circuit need be considered necessary redundancy and Safety Design requirement, can select the switch and the control circuit of bimodulus, three moulds, four moulds or five mould redundant configuration.For the security requirement higher system, preferred series connection bimodulus structure as shown in Figure 5; For the system that security, reliability are all had relatively high expectations, preferred four mould redundancy structures as shown in Figure 6.The parallel diode of above-mentioned two branch roads that it may be noted that also will be selected series connection bimodulus and four mould redundancy structures corresponding shown in Fig. 5,6 according to redundancy structure.
Key problem in technology point of the present invention is:
1, electrifying startup-normal turn-off branch road and two power supply branch roads of safe shutdown branch road are provided for controlled system.Set up power supply by electrifying startup-normal turn-off branch road during electrification reset, power to controlled system.After controlled system was working properly, the gauge tap of meeting conducting safe shutdown branch road was set up power supply and is powered to controlled system.After the conducting of safe shutdown branch road postpones the regular hour simultaneously, can close electrifying startup-normal turn-off branch road automatically, only power to controlled system by the safe shutdown branch road this moment.
2, the duty by state recognition module monitors controlled system, and the state of control safe shutdown branch road.The level signal that the output cycle changed when controlled system was normally moved, and adopt certain coding strategy, thereby in case guarantee that controlled system can't operate as normal, the state recognition module can be discerned timely and accurately, and cut off unique power supply branch road-safe shutdown branch road, realize failure safe.
3, adopt d type flip flop to control the function that realization resets/postpones and controls, the state of electrifying startup-normal turn-off branch road is controlled.Circuit structure is simple, is easy to realize.
4, use pliotron or metal-oxide-semiconductor design electronic switch, solved the mechanical relay switch life with by current related, the short relatively and big expensive problem of electric current model photoelectric relay of life-span.Security, the reliability requirement be convenient to according to controlled system are taked cascaded structure, string and different configuration modes such as structure or multi-mode redundant configuration structure.
As can be seen from the above embodiments, the embodiment of the invention realizes fail-safe method by the power supply that adopts direct cut-out controlled system, turn-offs output than general passing through and realizes fail-safe method, and is more thorough, eliminated potential safety hazard; Replace the normal operating conditions that the signal that overturns is indicated controlled system by high-low level, can distinguish mutually, improved the security of state recognition module with output signal solid " 0 " or solid " 1 " mistake that the digital circuit inefficacy brings; Use pliotron or metal-oxide-semiconductor design electronic switch, solved the mechanical relay switch life with by current related, the short relatively and big expensive problem of electric current model photoelectric relay of life-span.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the technology of the present invention principle; can also make some improvement and modification, these improve and modification also should be considered as protection scope of the present invention.
Claims (7)
1. realize fail-safe method by power cutoff for one kind, it is characterized in that, comprise step:
S1, for controlled system is set up the power supply branch road of two parallel connections, the power supply branch road of described two parallel connections is electrifying startup-normal turn-off branch road and safe shutdown branch road;
S2, the gauge tap of the described electrifying startup of conducting-normal turn-off branch road during electrification reset is given described controlled system power supply;
S3 judges by condition indicative signal whether the duty of controlled system is normal by the state recognition module, if then the gauge tap of conducting safe shutdown branch road is set up power supply and given described controlled system power supply;
S4, the conducting of described safe shutdown branch road and postpone certain hour after, disconnect the gauge tap of described electrifying startup-normal turn-off branch road by the control module that resets/postpone;
S5 monitors the state of controlled system in real time by described state recognition module, when condition indicative signal shows the controlled system operation exception, then exports the gauge tap that cut-off signals disconnects described safe shutdown branch road.
2. as claimed in claim 1ly realize fail-safe method by power cutoff, it is characterized in that, the status signal of exporting during the controlled system operate as normal is the level signal that changes in the cycle, and whether the status signal that described state recognition module is sent by decoding circuit identification controlled system is normal.
3. as claimed in claim 2ly realize fail-safe method, it is characterized in that,, judge that the duty of controlled system occurs unusual when the state recognition module detects less than status signal or decodes when unusual by power cutoff.
4. as claimed in claim 1ly realize fail-safe method, it is characterized in that described resetting/postpone control module realizes conducting and disconnection to the gauge tap of described electrifying startup-normal turn-off branch road by trigger by power cutoff.
5. each describedly realizes fail-safe method by power cutoff as claim 1-3, it is characterized in that the gauge tap of described electrifying startup-normal turn-off branch road and/or described safe shutdown branch road is a photoelectric relay.
6. each describedly realizes fail-safe method by power cutoff as claim 1-3, it is characterized in that, the gauge tap of described electrifying startup-normal turn-off branch road and/or described safe shutdown branch road adopts pliotron to make.
7. each describedly realizes fail-safe method by power cutoff as claim 1-3, it is characterized in that, the gauge tap of described electrifying startup-normal turn-off branch road and/or described safe shutdown branch road adopts power MOS pipe to make.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104777805A (en) * | 2015-02-11 | 2015-07-15 | 北京配天技术有限公司 | Industrial robot safety control system as well as backup safety circuit and safety module |
| CN109565250A (en) * | 2016-08-04 | 2019-04-02 | 西门子股份公司 | Soft activator, operation method and switching system |
| CN109556869A (en) * | 2018-11-14 | 2019-04-02 | 中国直升机设计研究所 | Test-bed startup power supply control system |
| CN112462643A (en) * | 2020-11-05 | 2021-03-09 | 中国航空工业集团公司西安航空计算技术研究所 | Self-cancellation state monitoring system based on power supply control switching |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104777805A (en) * | 2015-02-11 | 2015-07-15 | 北京配天技术有限公司 | Industrial robot safety control system as well as backup safety circuit and safety module |
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| CN109565250A (en) * | 2016-08-04 | 2019-04-02 | 西门子股份公司 | Soft activator, operation method and switching system |
| CN109565250B (en) * | 2016-08-04 | 2022-05-31 | 西门子股份公司 | Soft starter, operation method and switch system |
| CN109556869A (en) * | 2018-11-14 | 2019-04-02 | 中国直升机设计研究所 | Test-bed startup power supply control system |
| CN112462643A (en) * | 2020-11-05 | 2021-03-09 | 中国航空工业集团公司西安航空计算技术研究所 | Self-cancellation state monitoring system based on power supply control switching |
| CN112462643B (en) * | 2020-11-05 | 2022-03-15 | 中国航空工业集团公司西安航空计算技术研究所 | Self-cancellation state monitoring system based on power supply control switching |
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