CN111679621B - Circuit method for improving current output reliability in triple redundancy - Google Patents
Circuit method for improving current output reliability in triple redundancy Download PDFInfo
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- CN111679621B CN111679621B CN202010677507.6A CN202010677507A CN111679621B CN 111679621 B CN111679621 B CN 111679621B CN 202010677507 A CN202010677507 A CN 202010677507A CN 111679621 B CN111679621 B CN 111679621B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/048—Monitoring; Safety
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/21—Pc I-O input output
- G05B2219/21024—Analog output
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/24—Pc safety
- G05B2219/24182—Redundancy
Abstract
The invention discloses a circuit method for improving current output reliability in triple redundancy, which is characterized in that at most one path of output is finally obtained after current output is tripled, each independent current output branch channel is provided with a branch channel control enabling signal, the final trunk path is provided with a trunk switch, the trunk switch is controlled by trunk control logic, and the trunk control logic has a limit relation of selecting one path of operation at most for the control logic of the branch channels, so that the final output current is ensured not to have multipath superposition. The invention selects the corresponding current output loop through the input under different logics, ensures that other loops or the main loop are locked after one of the three redundant loops is gated, ensures the reliability of the final output current from hardware, and can ensure the safety of the final output even if the software fails in the configuration.
Description
Technical Field
The invention belongs to the technical field of automatic control, is applied to the field of functional safety protection application, more specifically relates to current reliability output in the field of functional safety application, and particularly relates to a circuit method for improving the current output reliability in triple redundancy.
Background
In the automatic control application, the current output is mainly a single-path output, and in the functional safety application field, in order to improve the reliability of the product, a multiple design scheme is generally adopted. When the current is designed in a multiple manner, because the current has the problem of superposition of the output of the total loop after parallel output, the traditional method is to sequentially control the opening or closing of the control loop of each branch in a software control mode. The method relies on the control logic of software, and if the software works abnormally, the current still has the risk of being output at the same time.
Fig. 1 shows a conventional triplex current output scheme. The current output branch channel 1 is a tripled 1-unit current output loop, and the branch channel control 1 is the selection of an output enable/disable switch of the 1 unit; the current output branch channel 2 is a tripled 2-unit current output loop, and the branch channel control 2 is 2-unit output enable/disable switch selection; the current output branch channel 3 is a tripled 3-unit current output loop, and the branch channel control 3 is 3-unit output enable/disable switch selection. When the current output circuit is used, one of the two paths is selected as output through configuration software or triple embedded logic, the outputs of the other two paths are forbidden, and finally the outputs are collected into the current total output circuit for external output. The method depends on the final output result of the software, and when the software fails, the final current output may be the case that a plurality of loops have outputs.
Disclosure of Invention
In view of the defects of the conventional scheme, the invention aims to provide a circuit method for improving the current output reliability in triple redundancy, which selects corresponding current output loops through inputs under different logics, ensures that one of three redundant loops is gated, simultaneously locks other loops or a total loop, ensures the reliability of final output current from hardware, and can ensure the safety of final output even if software fails in configuration.
The purpose of the invention is realized by the following technical scheme:
a circuit method for improving current output reliability in triple redundancy is characterized in that: at most one path of output is finally obtained after the current output is tripled, each independent current output branch path has a branch path control enabling signal, the final trunk path has a trunk path switch controlled by a trunk path control logic, and the trunk path control logic has a limited relationship of at most gating one path of work for the control logic of the branch path, so that the final output current is ensured not to have multipath superposition; the method comprises the following specific steps:
bypass channel output enable 1: a switching signal for controlling the bypass channel 1 to permit or prohibit output;
bypass channel output enable 2: a switching signal for controlling the bypass channel 2 to permit or prohibit output;
bypass channel output enable 3: a switching signal for controlling the bypass channel 3 to permit or prohibit output;
branch passage control 1: receiving a tripled current output enable instruction of 1 unit of the cells;
branch passage control 2: receiving a tripled current output enable instruction of 2 units;
branch passage control 3: receiving a tripled current output enable instruction of 3 units;
a main circuit switch: the main circuit switch is used for controlling the final current output, and cutting off a main output circuit when a current output instruction which does not accord with the logic judgment occurs so as to ensure the final external safety and reliability; when an allowable current output instruction appears, the main circuit switch closes the switch of the output circuit to ensure the normal control to the outside;
wherein:
the tripled current output loops are respectively controlled by mutually independent current output branch channels; each mutually independent current output branch channel comprises a current output branch channel and a branch channel output enable; the trunk control logic is a three-out-of-two logic, and the selected logic is from branch channel output enable 1, branch channel output enable 2 and branch channel output enable 3 of the three branches; the branch channel control 1, the branch channel control 2 and the branch channel control 3 do not have a coupling relation and are respectively controlled by the control loop of the unit.
In the present invention, three current output branch channel signals are respectively controlled by tripled respective units, wherein:
the current output branch channel 1 and the branch channel output enable 1 are controlled by the output control of the 1 st unit which is tripled;
the current output branch channel 2 and the branch channel output enable 2 are controlled by the output control of the tripled 2 nd unit;
the current output branch channel 3 and the branch channel output enable 3 are controlled by the output control of the tripled 3 rd unit;
the trunk control logic is the common logic output control of three tripled units to realize the control of the trunk switch and the optimization of the execution of three branches.
The total current output is equal to the 1 selected branch channel current output by the configuration requirement.
The application of the triple current output is generally that three independent control units send current output control signals to the unit, which are called as a current output branch channel 1, a current output branch channel 2 and a current output branch channel 3 in the invention. In the application of the triple design, three tripled units are equal in priority, there is no high-low score, and therefore, before practical use, it is necessary to configure which channel is the final output loop. The circuit is designed in the triple application, and the invention adds a logic switch on the final trunk circuit, and the control logic of the logic switch is also from the configuration signal for gating which channel as the output. More specifically, the trunk control logic adopts a three-out-of-two application logic, and the reliability of current output is finally improved through the logic design in the invention.
In the invention, the final outward output of the triple current output loop is only allowed to be output to the outside by 1 channel loop at most, and the unreliable output influence caused by software faults is completely avoided. The availability and the safety of current output under triple application are greatly improved.
Drawings
Fig. 1 is a schematic diagram of current output under conventional triple redundancy.
Fig. 2 is a schematic diagram of the present invention for improving the reliability of current output.
Fig. 3 is a schematic diagram of a specific application circuit that can embody the idea of the present invention.
Detailed Description
The present invention and the practical application circuit proposed by the present invention are further explained below with reference to the attached drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the manner shown in fig. 2, the present invention provides a logic optimization scheme, which adds two parts, namely a main circuit control logic and a main circuit switch, based on the original traditional current output. The main circuit switch part is arranged on a loop after the three currents are collected, whether the switch is opened or not is influenced by the main circuit control logic, and the final output result of the main circuit control logic depends on the simultaneous configuration conditions of a branch channel output enable 1, a branch channel output enable 2 and a branch channel output enable 3 of three current output branch channels.
A circuit method for improving current output reliability in triple redundancy is characterized in that at most one path of output is finally obtained after current output is tripled, each independent current output branch path has a branch path control enabling signal, the final trunk path has a trunk path switch, the trunk path switch is controlled by a trunk path control logic, the trunk path control logic has a limit relation of at most gating one path of operation for the control logic of the branch path, and further the final output current is ensured not to have multipath superposition; the method comprises the following specific steps:
bypass channel output enable 1: a switching signal for controlling the bypass channel 1 to permit or prohibit output;
bypass channel output enable 2: a switching signal for controlling the bypass channel 2 to permit or prohibit output;
bypass channel output enable 3: a switching signal for controlling the bypass channel 3 to permit or prohibit output;
branch passage control 1: receiving a tripled current output enable instruction of 1 unit of the cells;
branch passage control 2: receiving a tripled current output enable instruction of 2 units;
branch passage control 3: receiving a tripled current output enable instruction of 3 units;
a main circuit switch: the main circuit switch is used for controlling the final current output, and cutting off a main output circuit when a current output instruction which does not accord with the logic judgment occurs so as to ensure the final external safety and reliability; when an allowable current output instruction appears, the main circuit switch closes the switch of the output circuit to ensure the normal control to the outside;
wherein:
the tripled current output loops are respectively controlled by mutually independent current output branch channels; each mutually independent current output branch channel comprises a current output branch channel and a branch channel output enable; the trunk control logic is a three-out-of-two logic, and the selected logic is from branch channel output enable 1, branch channel output enable 2 and branch channel output enable 3 of the three branches; the branch channel control 1, the branch channel control 2 and the branch channel control 3 do not have a coupling relation and are respectively controlled by the control loop of the unit.
The logic of two out of three satisfies the following logical relationship, where example 1 in table 1 is the channel enable output, and 0 is the branch disable output:
TABLE 1
When the loops of more than 2 current output branch channels are gated, the main circuit control logic cuts off the main circuit switch; when no more than 2 current output branch channels are gated, the trunk control logic does not switch off the trunk switch.
The enabling/disabling of the trunk switch of the trunk control logic is logically opposite to the branch channel control 1 or the branch channel control 2 or the branch channel control 3; the logic of the enable/disable channels of the branch channel control 1, the branch channel control 2, and the branch channel control 3 is the same.
Trunk control logic:
logic for controlling the closing and opening of the main circuit switch. Control signals (branch channel output enable 1, branch channel output enable 2, branch channel output enable 3) from outputs of all the tripled units are received, and logic of taking three out of two is achieved.
The workflow of the present invention will be further described below, and for convenience of description, "1" is defined as channel enable/open, and "0" is defined as channel disable/close.
1. When the branch channel output enable 1 is selected as the output, the branch channel output enable 2 prohibits the output, and the branch channel output enable 3 prohibits the output:
the main circuit control logic executes a two-out-of-three logic, a 0 result is found according to the input 1, 0 and 0 channel state table, the main circuit switch output is allowed output due to the fact that the controller logic of the main circuit switch is opposite, and the final output of the system is the output of a current output branch circuit channel 1 channel.
2. When the branch channel output enable 2 is selected as the output, the branch channel output enable 1 prohibits the output, and the branch channel output enable 3 prohibits the output:
and the trunk circuit control logic executes a two-out-of-three logic, and a 0 result is solved according to the input 0, 1 and 0 channel state tables, because the controller logics of the trunk circuit switch are opposite, the output of the trunk circuit switch is allowed to be output, and the final output of the system is the output of the current output branch circuit channel 2 channel.
3. When the branch channel output enable 3 is selected as the output, the branch channel output enable 1 prohibits the output, and the branch channel output enable 2 prohibits the output:
the main circuit control logic executes a two-out-of-three logic, a 0 result is found according to the input 0, 0 and 1 channel state table, the main circuit switch output is allowed output due to the fact that the controller logic of the main circuit switch is opposite, and the final output of the system is output of a current output branch circuit channel 3 channel.
4. When the branch channel output enable 1 is selected as the output, the branch channel output enable 2 is selected as the output, and the branch channel output enable 3 disables the output:
the main circuit control logic executes a two-out-of-three logic, the result of 1 is found out according to the input 1, 1 and 0 channel state table, the output of the main circuit switch is forbidden output because the controller logic of the main circuit switch is opposite, and the final output of the system is no current output.
5. When the branch channel output enable 1 is selected as the output, the branch channel output enable 2 prohibits the output, and the branch channel output enable 3 is selected as the output:
the main circuit control logic executes a two-out-of-three logic, the result of 1 is found out according to the input 1, 0 and 1 channel state table, the output of the main circuit switch is forbidden output because the controller logic of the main circuit switch is opposite, and the final output of the system is no current output.
6. When the branch channel output enable 1 is the disable output, the branch channel output enable 2 is selected as the output, and the branch channel output enable 3 is selected as the output:
the main circuit control logic executes a two-out-of-three logic, the result of 1 is found out according to the input three channel state tables of 0, 1 and 1, the output of the main circuit switch is forbidden output because the controller logic of the main circuit switch is opposite, and the final output of the system is no current output.
7. When the branch channel output enable 1 is selected as the output, the branch channel output enable 2 is selected as the output, and the branch channel output enable 3 is selected as the output:
the main circuit control logic executes a two-out-of-three logic, the result of 1 is found out according to the input 1, 1 and 1 channel state tables, the output of the main circuit switch is forbidden output because the controller logic of the main circuit switch is opposite, and the final output of the system is no current output.
8. When the branch channel output enable 1 is output forbidding, the branch channel output enable 2 is output forbidding, and the branch channel output enable 3 is output forbidding:
the main circuit control logic executes a two-out-of-three logic, and the result of 1 is found out according to the three channel state tables of 0, 0 and 0, and because the controller logic of the main circuit switch is opposite, although the output of the main circuit switch is allowed at the moment, the output of each branch is forbidden, so that the overall external output still has no current output.
The method shown in fig. 3 is a specific application circuit based on the idea of the present invention.
The branch channel control of every treble current output branch road uses an opto-coupler switch, and the output loop connects at the output of opto-coupler, and control end one end connects fixed resistance and power, and the other end connects the output control pin of this unit, and in the case in this figure, when control pin output low level, the opto-coupler switches on, and the output of this unit is opened, otherwise this unit disconnection. The power supply and the current limiting resistor are selected according to actual optocoupler control parameters, such as: when the on-current of the optocoupler is required to be 3mA and the power supply is 15V, the current-limiting resistor is selected to be 5100 ohm, and the low level given by the control end finally reaches the reference ground plane of the 15V power supply at the pin of the optocoupler.
In the design of the trunk switch in fig. 3, the output end of the optocoupler U4 is connected to the trunk loop, and in order to meet the requirement of the opposite logic, pin 2 of U4 is grounded, and pin 1 of U4 is connected to one end of the trunk control logic. The other end of the main circuit control logic is connected with a current limiting resistor and a power supply, and the size of the power supply and the current limiting resistor is consistent with that of the current output branch channel. The trunk channel control logic is as shown in the figure connection method, a branch channel control 1 signal is connected to the switch S1, a branch channel controller 2 signal is connected to the switch S2, a branch channel control 3 signal is connected to the switch S3, and the logic AND back signals of the branch channel control 1 and the branch channel control 2 are connected to the switch S4. The switches S1 and S2 are connected in parallel, the switches S3 and S4 are connected in parallel, and the two switches are connected in series after being connected in parallel.
The truth values of the switching logic are as in table 2:
TABLE 2
As shown in the above table, when the trunk control logic is 0, it indicates that at least 2 branch channels of the current branch are powered on, and the result of taking two out of three results in the power of the trunk not being turned on, so that the trunk switch U4 is not turned on. When the main circuit control logic is 1, at least one output of the current branch is gated or none of the outputs is gated at the moment, and only 1 circuit of the current which can be finally output can be output at most through the combined control of the logic.
The optical coupler is not the only choice to be selected as a control device, and on the design that other innovation points are not involved, devices for realizing the closing or closing of a signal logic control loop are all within the scope of the scheme of the invention;
two-out-of-three of the trunk control logic is only a typical embodiment, and the specific embodiment described in the present invention should not be taken as limiting the protection scope of the present solution, as long as the two-out-of-three scheme is implemented within the scope included in the present solution.
Claims (7)
1. A circuit method for improving current output reliability in triple redundancy is characterized in that: at most one path of output is finally obtained after the current output is tripled, each independent current output branch path has a branch path control enabling signal, the final trunk path has a trunk path switch controlled by a trunk path control logic, and the trunk path control logic has a limited relationship of at most gating one path of work for the control logic of the branch path, so that the final output current is ensured not to have multipath superposition; the method comprises the following specific steps:
bypass channel output enable 1: a switching signal for controlling the bypass channel 1 to permit or prohibit output;
bypass channel output enable 2: a switching signal for controlling the bypass channel 2 to permit or prohibit output;
bypass channel output enable 3: a switching signal for controlling the bypass channel 3 to permit or prohibit output;
branch passage control 1: receiving a tripled current output enable instruction of 1 unit of the cells;
branch passage control 2: receiving a tripled current output enable instruction of 2 units;
branch passage control 3: receiving a tripled current output enable instruction of 3 units;
a main circuit switch: the main circuit switch is used for controlling the final current output, and cutting off a main output circuit when a current output instruction which does not accord with the logic judgment occurs so as to ensure the final external safety and reliability; when an allowable current output instruction appears, the main circuit switch closes the switch of the output circuit to ensure the normal control to the outside;
wherein:
the tripled current output loops are respectively controlled by mutually independent current output branch channels; each mutually independent current output branch channel comprises a current output branch channel and a branch channel output enable; the trunk control logic is a three-out-of-two logic, and the selected logic is from branch channel output enable 1, branch channel output enable 2 and branch channel output enable 3 of the three branches; the branch channel control 1, the branch channel control 2 and the branch channel control 3 do not have a coupling relation and are respectively controlled by the control loop of the unit.
2. The circuit method for improving current output reliability in triple redundancy according to claim 1, wherein: the trunk control logic is the common logic output control of three tripled units to realize the control of the trunk switch and the optimization of the execution of three branches.
3. The circuit method for improving current output reliability in triple redundancy according to claim 1, wherein: the total current output is equal to the 1 selected branch channel current output by the configuration requirement.
4. The circuit method for improving current output reliability in triple redundancy according to claim 1, wherein: the logic of two out of three satisfies the following logical relationship, in the table, example 1 is channel enable output, and 0 is branch disable output:
5. the circuit method for improving current output reliability in triple redundancy according to claim 1, wherein: when the loops of more than 2 current output branch channels are gated, the main circuit control logic cuts off the main circuit switch; when no more than 2 current output branch channels are gated, the trunk control logic does not switch off the trunk switch.
6. The circuit method for improving current output reliability in triple redundancy of claim 5, wherein: the enabling/disabling of the trunk switch of the trunk control logic is logically opposite to the branch channel control 1 or the branch channel control 2 or the branch channel control 3; the logic of the enable/disable channels of the branch channel control 1, the branch channel control 2, and the branch channel control 3 is the same.
7. The circuit method for improving current output reliability in triple redundancy according to claim 1, wherein: the method comprises the following specific steps:
the branch channel control 1 adopts an optocoupler as a control device, wherein an input control side pin 1 of the optocoupler is connected with a current-limiting resistor in series and then reaches the positive end of a power supply, a negative end pin 2 is connected with a branch channel output enable 1 from a control unit, an output end pin 4 of the optocoupler is connected with a current output pin of the unit, and an output end pin 3 is connected with an output pin 4 of a main circuit control;
the connection method of the branch channel control 2 and the branch channel control 3 is the same as that of the branch channel control 1;
the main circuit switch adopts an optical coupler as a control device, an input pin 1 is connected with the right common end of the switch S3 and the switch S4, an input pin 2 is connected with a signal reference ground, an output pin 3 is connected with an external current output terminal, and an output pin 4 is connected with the common point of the branch channel control 1, the branch channel control 2 and the branch channel control 3;
the trunk control logic is implemented by four switches, wherein the switches S1 and S2 are connected in parallel, the switches S3 and S4 are connected in parallel, and the result of the parallel connection of S1 and S2 is connected in series with the result of the parallel connection of S3 and S4; the left common ends of S1 and S2 are connected to a power supply through a current limiting resistor R1, and the right common ends of S3 and S4 are connected to an input pin 1 of the main switch optical coupler;
the control signal of the switch S1 is the tributary channel output enable 1, the control signal of the switch S2 is the tributary channel output enable 2, the control signal of the switch S3 is the tributary channel output enable 3, and the control signal of the switch S4 is the common result of the logical and of the tributary channel output enable 1 and the tributary channel output enable 2 signals.
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2020
- 2020-07-15 CN CN202010677507.6A patent/CN111679621B/en active Active
- 2020-08-28 WO PCT/CN2020/112255 patent/WO2022011801A1/en active Application Filing
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| Publication number | Publication date |
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| WO2022011801A1 (en) | 2022-01-20 |
| CN111679621A (en) | 2020-09-18 |
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