CN108548985A - Safety output circuit and self checking method - Google Patents
Safety output circuit and self checking method Download PDFInfo
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- CN108548985A CN108548985A CN201810539750.4A CN201810539750A CN108548985A CN 108548985 A CN108548985 A CN 108548985A CN 201810539750 A CN201810539750 A CN 201810539750A CN 108548985 A CN108548985 A CN 108548985A
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- output
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- safety
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
Abstract
A kind of Safety output circuit of present invention offer and self checking method.Safety output circuit includes control unit and at least the independent output channel of two-way, output channel include channel main circuit and sample circuit；Control unit is connect with the input terminal of each channel main circuit, and control unit inputs different control signals to each channel main circuit, so that each channel main circuit exports different output signals；The output end of sample circuit and channel main circuit connects, the sampled signal of sample circuit acquisition channel main circuit output, and by sampled signal input control unit；Control unit detects whether Safety output circuit breaks down according to sampled signal；Realize the function that Safety output circuitry self test surveys the output channel and Safety output that break down.The present invention is cost-effective without complicated detection circuit not by load effect, strong antijamming capability, improves availability and the safety of product.
Description
Technical field
The present invention relates to Safety output field of circuit technology more particularly to a kind of Safety output circuits and self checking method.
Background technology
With the development and progress of society, various Industry Control Application fields the degree of automation step up, it is intelligent
Technology develops rapidly, while there is also many potential dangerous and risk, functional safety and human safety issues to be increasingly subject to
Pay attention to, the birth of safe laser radar provides a great convenience for the solution of safety problem.Therefore, to safe laser radar
The detection of output circuit safety is particularly important.
Currently, having two kinds of static detection and dynamic detection to the detection method of the output circuit safety of safe laser radar
Method.The safety of output circuit is monitored by the method for static detection, while the safety of detection circuit is also required to monitor, and makes
At circuit complexity and it is difficult to ensure reliability.External portioned product detects the peace of Safety output circuit using the method for dynamic detection
Quan Xing, but need to be equipped with complicated coding and decoding circuit, output loading is affected to detection circuit, cause circuit complicated and
It is difficult to ensure reliability.
Invention content
A kind of Safety output circuit of present invention offer and self checking method, it is existing to the defeated of safe laser radar to solve
The problem of going out the detection method circuit complexity of circuit safety and being difficult to ensure reliability.
It is an aspect of the invention to provide a kind of Safety output circuits, including：Control unit and at least two-way is independent
Output channel, the output channel include channel main circuit and sample circuit；
Described control unit is connect with the input terminal of each channel main circuit, and described control unit is to each channel master
Circuit inputs different control signals, so that each channel main circuit exports different output signals；
The sample circuit is connect with the output end of the channel main circuit, and the sample circuit acquires the main electricity in channel
The sampled signal of road output, and the sampled signal is inputted into described control unit；
Described control unit detects whether the Safety output circuit breaks down according to the sampled signal.
Another aspect of the present invention is to provide a kind of Safety output circuitry self test method, including：The Safety output electricity
Road is Safety output circuit described above；
When the Safety output circuit is opened, each road output channel of the described control unit to the Safety output circuit
Channel main circuit input different control signals；
Described control unit receives the sampled signal of each channel main circuit output of sample circuit acquisition, according to each institute
The sampled signal for stating channel main circuit output detects whether each output channel breaks down.
Safety output circuit and self checking method provided by the invention, Safety output circuit can be by control units to each road
Output channel inputs different control signals, according to the sampled signal that the sample circuit of output channel acquires, can be sent out with self-test
The output channel now to break down realizes the function of Safety output circuitry self test survey and Safety output.The present invention is not loaded
It influences, strong antijamming capability, it is cost-effective without complicated detection circuit, improve availability and the safety of product.
Description of the drawings
Fig. 1 is the structural schematic diagram of Safety output circuit provided in an embodiment of the present invention；
Fig. 2 is control signal timing diagram provided in an embodiment of the present invention；
Fig. 3 is Safety output circuitry self test method flow diagram provided in an embodiment of the present invention；
Fig. 4 is the Safety output circuitry self test method flow diagram that another embodiment of the present invention provides.
Through the above attached drawings, it has been shown that the specific embodiment of the present invention will be hereinafter described in more detail.These attached drawings
It is not intended to limit the scope of the inventive concept in any manner with verbal description, but is by referring to specific embodiments
Those skilled in the art illustrate idea of the invention.
Specific implementation mode
Example embodiments are described in detail here, and the example is illustrated in the accompanying drawings.Following description is related to
When attached drawing, unless otherwise indicated, the same numbers in different drawings indicate the same or similar elements.Following exemplary embodiment
Described in embodiment do not represent and the consistent all embodiments of the present invention.On the contrary, they be only with it is such as appended
The example of the consistent device and method of some aspects being described in detail in claims, of the invention.
In the embodiment of the present invention, term " first ", " second " etc. are used for description purposes only, and should not be understood as instruction or dark
Show relative importance or implicitly indicates the quantity of indicated technical characteristic.In the description of following embodiment, " multiple "
It is meant that two or more, unless otherwise specifically defined.
These specific embodiments can be combined with each other below, may be at certain for same or analogous concept or process
It is repeated no more in a little embodiments.Below in conjunction with attached drawing, the embodiment of the present invention is described.
Fig. 1 is the structural schematic diagram of Safety output circuit provided in an embodiment of the present invention；Fig. 2 provides for the embodiment of the present invention
Control signal timing diagram.Safety output circuit provided in an embodiment of the present invention is applied to safe laser radar, is safe laser
The output circuit of radar；In addition, Safety output circuit can also be applied to industry spot in the present embodiment other embodiment
Functional safety component, the present embodiment are not specifically limited this.
As shown in Figure 1, the Safety output circuit includes：The independent output channel of control unit 1 and at least two-way each should
Output channel includes channel main circuit 2 and sample circuit 3.
To the structure of Safety output circuit only by taking the Safety output circuit includes the independent output channel of two-way as an example in Fig. 1
Schematically illustrated.In the embodiment of the present invention, Safety output circuit may include the roads N output channel, and N is positive integer.Control
Unit 1 processed can also regard a part for every road output channel as, and the roads N output channel shares a control unit 1, control unit
1 simultaneously controls the roads N output channel, in order to which control unit 1 detects the failure between each road output channel.
Specifically, the control unit 1 is connect with the input terminal of the respectively channel main circuit 2 respectively, the control unit 1 was to respectively should
Channel main circuit 2 inputs different control signals, so that respectively the channel main circuit 2 exports different output signals.
The sample circuit 3 is connect with the output end of the channel main circuit 2, and it is defeated which acquires the channel main circuit 2
The sampled signal gone out, and the sampled signal is inputted into the control unit 1.
The control unit 1 detects whether the Safety output circuit breaks down according to the sampled signal.
In the present embodiment, control signal of the control unit 1 to the input of the channel main circuit 2 of output channel, it may also be said to
It is that control unit 1 inputs the control signal to output channel；The output signal of the channel main circuit 2 of output channel that is to say that this is defeated
Go out the output signal in channel.
In the present embodiment, the control signal which inputs to the respectively channel main circuit 2 is periodically pulsing sequence
Row；And initial time and/or the termination for the pulse train that the control unit 1 is inputted to the different output channel of arbitrary two-way
Time is different.
When the Safety output circuit of safe laser radar is ON states, the ON states indicate the Safety output circuit
Normal output state it is defeated that the i-th tunnel is denoted as the arbitrary output channel all the way in the Safety output circuit of safe laser radar
Go out channel, i=1,2,3 ..., N.Control unit 1 is to the i-th tunnel output channel input using time T as the pulse train in period, the arteries and veins
Rush in each cycle T of sequence includes xiIt is a with time ti1It is t for period and low level timei2Pulse signal.The wherein time
ti1Less than or equal to T, time ti1Much larger than time ti2, such as ti1>2×ti2。
For example, as shown in Fig. 2, the control signal 1 that control unit 1 is inputted to the 1st tunnel output channel is using time T as the period
Pulse train, include x in each cycle T of the pulse train1It is a with time t11It is t for period and low level time12Arteries and veins
Rush signal.Wherein time t11Much larger than time t12, such as t11>2×t12。
For another example, the control signal 2 that control unit 1 is inputted to the 2nd tunnel output channel is the pulse sequence using time T as the period
Row, interior each cycle T of the pulse train includes x2It is a with time t21It is t for period and low level time22Pulse signal.
Wherein time t21Much larger than time t22, such as t21>2×t22。
Wherein, for different output channels, xiValue can be different, can also be identical, as long as different output is logical
The initial time and/or termination time difference of the pulse train of the control signal in road, to ensure the control of different output channels
The sequential of the pulse train of signal processed is inconsistent.For example, x1More than or equal to 2, x2More than or equal to 1, xiValue can be by technology people
Member is set according to actual needs, and the present embodiment is not specifically limited herein.
For Safety output circuit per output channel all the way, output channel does not break down under normal circumstances, defeated
The output signal for going out channel is consistent with the input control sequential of signal of the output channel.
For any output channel, the sampled signal that control unit 1 is acquired by the sample circuit 3 of the output channel will
Sampled signal is compared with the sequential of control signal for inputting the output channel, if sampled signal and the input output channel
The sequential for controlling signal is inconsistent, then can determine that the output channel breaks down.
Optionally, control unit 1 determines the sampled signal of an output channel and the control signal for inputting the output channel
Sequential it is inconsistent when, may further determine and the output channel occur short trouble.
If specifically, the sampled signal is whole high level signals, which determines the output channel and power supply
Short circuit occurs.
If the sampled signal is whole low level signals, which determines that with ground short circuit occurs for the output channel.
If the sampled signal number of low level signal and control signal in a cycle T is low in a cycle T
The number of level signal is unequal, it is determined that with another output channel short circuit occurs for the output channel.
For example, two-way output channel as shown in Figure 1, it is assumed that the control signal of the 1st tunnel output channel of input is at one
There are x1 low level signal, the control signal of the 2nd tunnel output channel of input to have y1 low level in a cycle T in cycle T
Signal.So, if of low level signal of the sampled signal of the sample circuit 3 of the 1st tunnel output channel in a cycle T
Number is x2, and x2 is equal with x1, then control unit can determine the sequential of the control signal and sampled signal of the 1st tunnel output channel
Unanimously, it may be determined that short trouble does not occur for the 1st tunnel output channel.If the sampling of the sample circuit 3 of the 2nd tunnel output channel
The number of low level signal of the signal in a cycle T is y2, and y2 is unequal with y1, then control unit can determine the 2nd
The control signal of road output channel and the sequential of sampled signal are inconsistent, it may be determined that short trouble occurs for the 2nd tunnel output channel.
Safety output circuit provided in an embodiment of the present invention can input difference by control unit 1 to each road output channel
Control signal, according to the sample circuit of output channel acquire sampled signal, the output that can be broken down with self-test
Channel realizes the function of Safety output circuitry self test survey and Safety output.The present invention is not by load effect, anti-interference ability
By force, it is not necessarily to complicated detection circuit, it is cost-effective, improve availability and the safety of product.
On the basis of the above embodiments, in another embodiment of the present invention, as shown in Figure 1, the channel main circuit 2 includes driving
Dynamic circuit 21 and push-pull output circuit 22.The input terminal of the driving circuit 21 is the input terminal of the channel main circuit 2, the control list
Control signal is output to the driving circuit 21 by member 1.The control of the output end of the driving circuit 21 and the push-pull output circuit 22
End connection, the driving circuit 21 control the control terminal of the push-pull output circuit 22 according to the control signal being somebody's turn to do.Recommending output mode electricity
The output end on road 22 is the output end of the channel main circuit 2.
Specifically, the push-pull output circuit 22 includes：First triode and the second triode.First triode and this
The base stage of two triodes is connect with the control terminal of the push-pull output circuit 22, that is to say, that the first triode and second triode
Base stage be push-pull output circuit 22 control terminal.
As shown in fig. 1, it indicates the first triode with triode Q1, the second triode is indicated with triode Q2.Three pole
The collector of pipe Q1 is connect with positive pole, the grounded collector of triode Q2, the emitter of triode Q1 and three pole
The emitter of pipe Q2 connects.
The output end of the transmitting extremely push-pull output circuit 22 of triode Q1, for the defeated of output channel where exporting
Go out signal.
In the present embodiment, control unit 1 will control signal when being input to output channel, the output signal warp of control unit 1
Overdrive circuit 21 controls turning on and off for triode Q1 and triode Q2, when it is high level to control signal, triode Q1
Conducting, triode Q2 are closed, then the output of output channel is high level；When it is low level to control signal, triode Q1 is closed
It closes, the output of triode Q2 conductings, output channel is low level.
When the output of Safety output circuit is opened, control unit 1 exports control signal to each road output channel.
Further, control unit detects that the sampled signal of output channel and the sequential of control signal are inconsistent, determines
After output channel breaks down, the output that control unit 1 controls Safety output circuit is closed, and the Safety output circuit enters
OFF state, the OFF state indicate the improper output state of the Safety output circuit.
In addition, in the present embodiment, when the failure of Safety output circuit is not detected, control unit 1 can also basis
Default rule controls Safety output circuit and closes so that the Safety output circuit enters OFF state when needed.
When the output of Safety output circuit is closed, the output that control unit 1 controls each road output channel is low level, to
It can ensure the safety of Safety output circuit.
The channel main circuit 2 includes driving circuit 21 and recommends defeated in the Safety output circuit provided in the embodiment of the present invention
Go out circuit 22.The performances such as the switching speed of two triodes in the push-pull output circuit 22 do not require particularly, circuit knot
Structure is simple, output logic is controllable, the operation is stable, safe.
Fig. 3 is Safety output circuitry self test method flow diagram provided in an embodiment of the present invention.Above-described embodiment is provided
Safety output circuit, the detailed process of the safety circuit self checking method is described in detail in the present embodiment.Such as Fig. 3
Shown, this method is as follows：
Step S301, when the Safety output circuit is opened, which exports to each road of the Safety output circuit
The channel main circuit in channel inputs different control signals.
In the present embodiment, which inputs one using T as the period to the channel main circuit of every road output channel
Pulse train, the initial time of the pulse train inputted to the channel main circuit of the arbitrary two-way output channel and/or when termination
Between it is different.
Step S302, the sampled signal of the place channel main circuit output of the sample circuit acquisition of each road output channel, and
Sampled signal is sent to control unit.
For Safety output circuit per output channel all the way, output channel does not break down under normal circumstances, defeated
The output signal for going out channel is consistent with the input control sequential of signal of the output channel.
For arbitrarily output channel all the way, control unit passes through the sampled signal that the sample circuit of the output channel acquires.
Step S303, the control unit receives the sampled signal of respectively channel main circuit output of sample circuit acquisition.
Step S304, the sampled signal detection that control unit is exported according to the respectively channel main circuit respectively the output channel whether
It breaks down.
In the step, control unit can according to sampled signal with input the output channel control signal sequential whether
Unanimously, determine whether the output channel breaks down.
Safety output of embodiment of the present invention circuit can input different control by control unit 1 to each road output channel
Signal, according to the sampled signal that the sample circuit of output channel acquires, the output channel that can be broken down with self-test is real
The function of Safety output circuitry self test survey and Safety output is showed.The present invention is not by load effect, strong antijamming capability, without multiple
Miscellaneous detection circuit, it is cost-effective, improve availability and the safety of product.
Fig. 4 is the Safety output circuitry self test method flow diagram that another embodiment of the present invention provides.Implement in the above method
On the basis of example, in the present embodiment, which detects the respectively output according to the sampled signal that the respectively channel main circuit exports
Whether channel breaks down, including：For any road output channel, which compares the main electricity in channel of the output channel
Whether the sampled signal of road output is consistent with the sequential of the control signal for the channel main circuit for inputting the output channel；If the sampling
The sequential of signal and the control signal is inconsistent, then the control unit determines that the output channel breaks down.As shown in figure 4, should
Method and step is as follows：
Step S401, when the Safety output circuit is opened, which exports to each road of the Safety output circuit
The channel main circuit in channel inputs different control signals.
Specifically, the control unit inputs one using T as the pulse in period to the channel main circuit of every road output channel
Sequence, the initial time of the pulse train inputted to the channel main circuit of the arbitrary two-way output channel and/or termination time are not
Together.
Including at least one period it is the arteries and veins of t1 by period low level time of t2 in each cycle T of the pulse train
Sequence is rushed, wherein t2 is less than or equal to T, and t2 is more than twice of t1.
Step S402, the sampled signal of channel main circuit output where the sample circuit acquisition of each road output channel, and will
Sampled signal is sent to control unit.
For Safety output circuit per output channel all the way, output channel does not break down under normal circumstances, defeated
The output signal for going out channel is consistent with the input control sequential of signal of the output channel.
For any output channel, control unit acquires sampled signal by the sample circuit of the output channel.
When the Safety output circuit of safe laser radar is opened, (output state of Safety output circuit is ON, Safety output
Circuit closing refers to that the output state of Safety output circuit is OFF) when, in the Safety output circuit of safe laser radar
Arbitrary output channel all the way, is denoted as the i-th tunnel output channel, i=1,2,3 ..., N.Control unit is inputted to the i-th tunnel output channel
Include x using time T as the pulse train in period, in each cycle T of the pulse trainiIt is a with time ti1For period and low electricity
It is t between usuallyi2Pulse signal.Wherein time ti1Less than or equal to T, time ti1Much larger than time ti2, such as ti1>2×ti2。
For example, as shown in Fig. 2, the control signal 1 that control unit is inputted to the 1st tunnel output channel is using time T as the period
Pulse train, include x in each cycle T of the pulse train1It is a with time t11It is t for period and low level time12Arteries and veins
Rush signal.Wherein time t11Much larger than time t12, such as t11>2×t12。
For another example, the control signal 2 that control unit is inputted to the 2nd tunnel output channel be using time T as the pulse train in period,
Include x in each cycle T of the pulse train2It is a with time t21It is t for period and low level time22Pulse signal.Wherein
Time t21Much larger than time t22, such as t21>2×t22。
Wherein, for different output channels, xiValue can be different, can also be identical, as long as different output is logical
The initial time and/or termination time difference of the pulse train of the control signal in road, to ensure the control of different output channels
The sequential of the pulse train of signal processed is inconsistent.For example, x1More than or equal to 2, x2More than or equal to 1, xiValue can be by technology people
Member is set according to actual needs, and the present embodiment is not specifically limited herein.
Step S403, the control unit receives the sampled signal of respectively channel main circuit output of sample circuit acquisition.
For Safety output circuit per output channel all the way, output channel does not break down under normal circumstances, defeated
The output signal for going out channel is consistent with the input control sequential of signal of the output channel.
Step S404, for any road output channel, the channel main circuit which compares the output channel is defeated
Whether the sampled signal gone out is consistent with the sequential of the control signal for the channel main circuit for inputting the output channel.
If step S405, the sampled signal is consistent with the sequential of the control signal, which determines that the output is logical
It does not break down in road.
If step S406, the sampled signal and the sequential of the control signal are inconsistent, which determines the output
It breaks down in channel.
Optionally, control unit determines the sampled signal of an output channel and the control signal for inputting the output channel
When sequential is inconsistent, it may further determine and short trouble occurs with the output channel.
If specifically, the sampled signal and the sequential of the control signal are inconsistent, which determines that the output is logical
Short trouble occurs for road, includes at least：
If the sampled signal is whole high level signals, it is short which determines that the output channel occurs with power supply
Road；If the sampled signal is whole low level signals, which determines that with ground short circuit occurs for the output channel；If this is adopted
The number of sample signal number of low level signal and control signal low level signal in a cycle T in a cycle T
It is unequal, it is determined that with another output channel short circuit occurs for the output channel.
For example, two-way output channel as shown in Figure 1, it is assumed that the control signal of the 1st tunnel output channel of input is at one
There are x1 low level signal, the control signal of the 2nd tunnel output channel of input to have y1 low level in a cycle T in cycle T
Signal.So, if of low level signal of the sampled signal of the sample circuit 3 of the 1st tunnel output channel in a cycle T
Number is x2, and x2 is equal with x1, then control unit can determine the sequential of the control signal and sampled signal of the 1st tunnel output channel
Unanimously, it may be determined that the 1st tunnel output channel does not break down.If the sampled signal of the sample circuit 3 of the 2nd tunnel output channel
The number of low level signal in a cycle T is y2, and y2 is unequal with y1, then control unit can determine that the 2nd road is defeated
The sequential of the control signal and sampled signal that go out channel is inconsistent, it may be determined that the 2nd tunnel output channel breaks down.
Optionally, if the sampled signal in a cycle T the number of low level signal and the control signal in a week
The number of low level signal is unequal in phase T, then control unit determines that with another output channel short circuit occurs for the output channel
Afterwards, control unit can be combined with the sampled signal of other each road output channels, sampled signal to the road output channel and its
The relevance of the sampled signal of his each road output channel is analyzed, and may further determine that and short circuit occurs with the output channel
Which output channel object is.
Further, control unit detects that the sampled signal of output channel and the sequential of control signal are inconsistent, determines
After output channel breaks down, the output that control unit 1 controls Safety output circuit is closed, and the Safety output circuit enters
OFF state, the OFF state indicate the improper output state of the Safety output circuit.
In addition, in the present embodiment, when the failure of Safety output circuit is not detected, control unit 1 can also basis
Default rule controls Safety output circuit and closes so that the Safety output circuit enters OFF state when needed.
When the output of Safety output circuit is closed, the output that control unit 1 controls each road output channel is low level, to
It can ensure the safety of Safety output circuit.
Safety output circuit provided in an embodiment of the present invention can input difference by control unit to each road output channel
Control signal, according to the sample circuit of output channel acquire sampled signal, the output that can be broken down with self-test
Channel realizes the function of Safety output circuitry self test survey and Safety output.The present invention is not by load effect, anti-interference ability
By force, it is not necessarily to complicated detection circuit, it is cost-effective, improve availability and the safety of product.
In several embodiments provided by the present invention, it should be understood that disclosed device and method can pass through it
Its mode is realized.For example, the apparatus embodiments described above are merely exemplary, for example, the division of the unit, only
Only a kind of division of logic function, formula that in actual implementation, there may be another division manner, such as multiple units or component can be tied
Another system is closed or is desirably integrated into, or some features can be ignored or not executed.Another point, it is shown or discussed
Mutual coupling, direct-coupling or communication connection can be the INDIRECT COUPLING or logical by some interfaces, device or unit
Letter connection can be electrical, machinery or other forms.
The unit illustrated as separating component may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, you can be located at a place, or may be distributed over multiple
In network element.Some or all of unit therein can be selected according to the actual needs to realize the mesh of this embodiment scheme
's.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, it can also
It is that each unit physically exists alone, it can also be during two or more units be integrated in one unit.Above-mentioned integrated list
The form that hardware had both may be used in member is realized, can also be realized in the form of hardware adds SFU software functional unit.
The above-mentioned integrated unit being realized in the form of SFU software functional unit can be stored in one and computer-readable deposit
In storage media.Above-mentioned SFU software functional unit is stored in a storage medium, including some instructions are used so that a computer
It is each that equipment (can be personal computer, server or the network equipment etc.) or processor (processor) execute the present invention
The part steps of embodiment the method.And storage medium above-mentioned includes：USB flash disk, mobile hard disk, read-only memory (Read-
Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disc or CD etc. it is various
The medium of program code can be stored.
Those skilled in the art can be understood that, for convenience and simplicity of description, only with above-mentioned each function module
Division progress for example, in practical application, can be complete by different function modules by above-mentioned function distribution as needed
At the internal structure of device being divided into different function modules, to complete all or part of the functions described above.On
The specific work process for stating the device of description, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.
Those skilled in the art after considering the specification and implementing the invention disclosed here, will readily occur to its of the present invention
Its embodiment.The present invention is directed to cover the present invention any variations, uses, or adaptations, these modifications, purposes or
Person's adaptive change follows the general principle of the present invention and includes undocumented common knowledge in the art of the invention
Or conventional techniques.The description and examples are only to be considered as illustrative, and true scope and spirit of the invention are by following
Claims are pointed out.
It should be understood that the invention is not limited in the precision architectures for being described above and being shown in the accompanying drawings, and
And various modifications and changes may be made without departing from the scope thereof.The scope of the present invention is only limited by appended claims
System.
Claims (10)
1. a kind of Safety output circuit, which is characterized in that including：The independent output channel of control unit and at least two-way, it is described
Output channel includes channel main circuit and sample circuit；
Described control unit is connect with the input terminal of each channel main circuit, and described control unit is to each channel main circuit
Different control signals is inputted, so that each channel main circuit exports different output signals；
The sample circuit is connect with the output end of the channel main circuit, and it is defeated that the sample circuit acquires the channel main circuit
The sampled signal gone out, and the sampled signal is inputted into described control unit；
Described control unit detects whether the Safety output circuit breaks down according to the sampled signal.
2. Safety output circuit according to claim 1, which is characterized in that the channel main circuit include driving circuit and
Push-pull output circuit；
The input terminal of the driving circuit is the input terminal of the channel main circuit, and described control unit is output to signal is controlled
The driving circuit；
The output end of the driving circuit is connect with the control terminal of the push-pull output circuit, and the driving circuit is according to described
Control signal controls the control terminal of the push-pull output circuit；
The output end of the push-pull output circuit is the output end of the channel main circuit.
3. Safety output circuit according to claim 2, which is characterized in that the push-pull output circuit includes：One or three
The control of the base stage and the push-pull output circuit of pole pipe and the second triode, first triode and second triode
End connection；
The collector of first triode is connect with positive pole, the grounded collector of second triode, and described first
The emitter of triode is connect with the emitter of second triode；
The output end of the extremely described push-pull output circuit of transmitting of first triode and the second triode.
4. Safety output circuit according to claim 1, which is characterized in that
The control signal that described control unit is inputted to each channel main circuit is periodically pulsing sequence；To arbitrary two-way
The initial time of the pulse train of different output channel inputs and/or termination time are different.
5. a kind of Safety output circuitry self test method, which is characterized in that including：The Safety output circuit is such as claim 1-
4 any one of them Safety output circuits；
When the Safety output circuit is ON states, each road output channel of the described control unit to the Safety output circuit
Channel main circuit input different control signals, the ON states indicate the normal output state of the Safety output circuit；
Described control unit receives the sampled signal of each channel main circuit output of sample circuit acquisition, according to each described logical
The sampled signal of road main circuit output detects whether each output channel breaks down.
6. according to the method described in claim 5, it is characterized in that, described control unit is to each road of the Safety output circuit
The channel main circuit of output channel inputs different control signals, including：
Described control unit to the channel main circuit of output channel described in every road input one using T as the pulse train in period, to
The initial time of the pulse train of the channel main circuit input of output channel described in arbitrary two-way and/or termination time are different.
7. according to the method described in claim 6, it is characterized in that, for the i-th tunnel output channel, each of described pulse train
In cycle T including at least one period with ti1It is t for period low level timei2Pulse train, wherein ti1It is less than or waits
In T, and ti1More than ti2Twice；
I-th tunnel output channel is arbitrary output channel all the way.
8. the method according to the description of claim 7 is characterized in that described control unit is exported according to each channel main circuit
Sampled signal detect whether each output channel breaks down, including：
For output channel described in any road, the sampling of the channel main circuit output of the described control unit output channel
Whether signal is consistent with the sequential of the control signal inputted to the channel main circuit of the output channel；
If the sampled signal and the sequential of the control signal are inconsistent, described control unit determines the output channel hair
Raw failure.
If 9. according to the method described in claim 8, it is characterized in that, the sampled signal with it is described control signal when
Sequence is inconsistent, then described control unit determines that the output channel breaks down, including：
If the sampled signal is whole high level signals, it is short that described control unit determines that the output channel occurs with power supply
Road；
If the sampled signal is whole low level signals, it is short that described control unit determines that the output channel occurs with ground
Road；
If the sampled signal number of low level signal and control signal in a cycle T is low in a cycle T
The number of level signal is unequal, it is determined that with another output channel short circuit occurs for the output channel.
10. according to claim 5-9 any one of them methods, which is characterized in that described defeated according to each channel main circuit
After whether each output channel of sampled signal detection gone out breaks down, further include：
Described control unit controls the Safety output circuit and closes, and the Safety output circuit enters OFF state, the OFF
State indicates the improper output state of the Safety output circuit；
When the Safety output circuit is OFF state, described control unit is logical to the output of each road of the Safety output circuit
The channel main circuit input low level signal in road.
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| CN201810539750.4A CN108548985A (en) | 2018-05-30 | 2018-05-30 | Safety output circuit and self checking method |
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| CN201810539750.4A CN108548985A (en) | 2018-05-30 | 2018-05-30 | Safety output circuit and self checking method |
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Application publication date: 20180918 |