CN109581209A - The state-detection of the two-terminal output of controller switches - Google Patents
The state-detection of the two-terminal output of controller switches Download PDFInfo
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- CN109581209A CN109581209A CN201710911792.1A CN201710911792A CN109581209A CN 109581209 A CN109581209 A CN 109581209A CN 201710911792 A CN201710911792 A CN 201710911792A CN 109581209 A CN109581209 A CN 109581209A
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- state
- logical value
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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
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
Abstract
Embodiment of the disclosure provides a kind of detection circuit of switching circuit, and wherein switching circuit controls the connecting and disconnecting of controlled circuit using switch.The detection circuit includes: the first observation circuit, is configured to determine that and switchs related first state；Monitoring load, is configured as being connected between switch and controlled circuit；Second observation circuit is configured to determine that and loads related second state with monitoring；And decision circuitry, it is configured as determining the working condition of switching circuit based on first state and the second state.Embodiment of the disclosure additionally provides a kind of method of detection switch circuit.
Description
Technical field
Present disclose relates generally to switching circuits, and more specifically it relates to a kind of switching circuit detection circuit and inspection
The method for surveying switching circuit.
Background technique
In control system and safety signal system, controller connects external controlled circuit to realize by switch output
On and off is opened.In order to ensure the correct work of controller switches, generally requires and the state of controller switches is detected, so as to
It takes appropriate measures in the case where there are respective conditions.For example, after issuing the instruction for disconnecting switch, if detected out
Guan Wei is normally disconnected in response to open command, then may need to cut off working power to avoid safety problem.
Currently, three terminal connection schemes of controller switches are widely used.But this scheme is lacked there are some
Point is unable to satisfy the demand of circuit design in many applications.For example, needing three cables to be connected using three termination solutions
It connects, when carrying out far distance control, it will increase cost significantly.In addition, the terminal connection type of three termination solutions has side
A possibility that tropism, there are wrongs.Furthermore the circuit board of three termination solutions needs to cause to control for three terminal reserved spaces
The volume of device product is larger.
Therefore, as more and more products using controller switches minimize, since small product size is limited and is
The wiring of controller switches uses two simply to avoid terminal block mistake in the application scenarios of many controller switches
Terminal output scheme.But realize that the detection of switching signal is relatively difficult in the subscheme of both ends.
Summary of the invention
Present disclose provides a kind of detection circuits of switching circuit and a kind of method of detection switch circuit, for solving
Above-mentioned and other various problems present in some controller switches circuits.
In the disclosure in a first aspect, providing a kind of detection circuit of switching circuit, wherein switching circuit uses switch
To control the connecting and disconnecting of controlled circuit.The detection circuit includes: the first observation circuit, is configured to determine that related with switch
First state；Monitoring load, is configured as being connected between switch and controlled circuit；Second observation circuit is configured as really
It is fixed to load related second state with monitoring；And decision circuitry, it is configured as determining based on first state and the second state
The working condition of switching circuit.
In some embodiments, the first observation circuit can be configured to: being disconnected in response to switch and determined the
One state is the first logical value；And determine that first state is the second logical value in response to closing the switch.
In some embodiments, the first observation circuit may include first optical coupling with input port and output port
Device, it is electric that input port is configured as detect the disconnection due to switch and generate in the input circuit of the first photo-coupler first
Stream, output port are configured to respond to the presence of the first electric current and are not present and export the first logical value and the second logic respectively
Value.
In some embodiments, monitoring load can be configured to: the second electricity in response to flowing through monitoring load
The variation of stream and generate voltage.
In some embodiments, monitoring load may include the inductor and resistor being connected in parallel.
In some embodiments, the second observation circuit can be configured to: in response to there is electricity in monitoring load
Pressing and determining the second state is the first logical value；And in response to determining that the second state is the there is no voltage in monitoring load
Two logical values.
In some embodiments, the second observation circuit may include second optical coupling with input port and output port
Device, input port are configured as detecting second generated in the input circuit of the second photo-coupler by the voltage in monitoring load
Electric current, output port are configured to respond to the presence of the second electric current and are not present and export the first logical value and second respectively and patrol
Collect value.
In some embodiments, decision circuitry can be configured to: if switching circuit is in startup stage, be rung
It should be the first logical value in first state and the second state is the second logical value, determine that the wiring of switching circuit is normal；And it rings
It should be the second logical value in first state and the second state is the second logical value, determine that the wiring of switching circuit is broken down.
In some embodiments, decision circuitry can be configured to: if switching circuit is in the operation phase, be rung
Should become the second logical value and the second state from the first logical value in first state is the second logical value, determines connecing for switching circuit
Line breaks down；Become the second logical value from the first logical value in response to first state and the second state is the first logical value, really
Determine switching circuit normal operation；In response to first state be the first logical value and the second state is the second logical value, determines switch
It breaks down；In response to first state be the second logical value and the second state is the first logical value, determines the wiring of switching circuit
It breaks down；Become the first logical value from the second logical value in response to first state and the second state is the first logical value, determines
Switching circuit operates normally；And be the second logical value in response to first state and the second state is the second logical value, determination is opened
It breaks down pass.
In the second aspect of the disclosure, a kind of method of detection switch circuit is provided, wherein switching circuit uses switch
To control the connecting and disconnecting of controlled circuit.This method comprises: being determined using the first observation circuit and switching related first shape
State；It is determined using the second observation circuit and monitors related second state that loads, monitoring load in series is in switch and controlled circuit
Between；And the working condition of switching circuit is determined based on first state and the second state using decision circuitry.
Detailed description of the invention
The following detailed description is read with reference to the accompanying drawings, above-mentioned and other purposes, the feature of embodiment of the disclosure
It will be easy to understand with advantage.In the accompanying drawings, several implementations of the disclosure are shown by way of example rather than limitation
Example, in which:
Fig. 1 shows the schematic diagram of three terminal connection schemes of traditional controller switch.
Fig. 2 shows the schematic diagrames of the two-terminal output scheme of conventional controller switch.
Fig. 3 shows the functional block diagram of detection switch circuit according to an embodiment of the present disclosure.
Fig. 4 shows the circuit diagram of the detection circuit according to an embodiment of the present disclosure for switching circuit.
Fig. 5 shows the result analogous diagram of the detection circuit according to an embodiment of the present disclosure for switching circuit.
Fig. 6 shows the flow chart of the method according to an embodiment of the present disclosure for detection switch circuit.
Specific embodiment
Several exemplary embodiments shown in below with reference to the accompanying drawings describe the principle and spirit of the disclosure.It should
Understand, describes these specific embodiments merely to enabling those skilled in the art to more fully understand and realizing this public affairs
It opens, and not limits the scope of the present disclosure in any way.
In the description of embodiment of the disclosure, term " includes " and its similar term should be understood as that opening includes,
I.e. " including but not limited to ".Term "based" should be understood as " being based at least partially on ".Term " one embodiment " or " reality
Apply example " it should be understood as " at least one embodiment ".Term " first ", " second " etc. may refer to different or identical right
As.Hereafter it is also possible that other specific and implicit definition.
Fig. 1 shows the schematic diagram of three terminal connection schemes 100 of traditional controller switch.As shown in Figure 1, it controls
Device 110 processed includes switch 111, and switch 111 is connected between power input terminal 112 and control output end 113.In addition, control
Device 110 processed further includes ground terminal 114.
So-called three terminals of the 112-114 of terminal shown in Fig. 1, that is, controller 110.As with external controlled circuit
A kind of way of example of connection, external power supply 120 can connect between power input terminal 112 and ground terminal 114, and bear
Carrying 130 can connect between control output end 113 and ground terminal 114.External power supply 120 and load 130 pass through switch
111 connection and closure and be formed into a loop or disconnect circuit.
In three termination solution 100 shown in FIG. 1, since there are power input terminal 112 and ground terminal 114, institutes
Can easily realize the detection for being switched on or switched off state of each terminal.But as mentioned above, this three terminal side
There are various disadvantages for case.Firstly, needing three cables to be attached using three termination solutions.It, will when carrying out far distance control
Cost can be increased significantly.Secondly, a possibility that terminal connection type of three termination solutions has directionality, and there are wrongs.Again
Secondary, the circuit board of three termination solutions needs to cause the volume of controller product larger for three terminal reserved spaces.
Therefore, as more and more products using controller switches minimize, since small product size is limited and is
The wiring of controller switches uses two simply to avoid terminal block mistake in the application scenarios of many controller switches
Terminal output scheme.This both ends subscheme extend also in D.C. contactor to contact whether the detection of adhesion.But
Realize that the detection of switching signal is then relatively difficult in the subscheme of both ends.
Fig. 2 shows the schematic diagrames of the two-terminal output scheme 200 of conventional controller switch.As shown in Figure 2, two
Terminal output scheme 200 by controller 210, relay 220, photo-coupler 230, Zener diode 240 and resistor 250,
260 equal compositions.When the output level of controller 210 is higher than the clamp voltage of Zener diode 240 and can produce greater than light
When the LED conduction threshold electric current of coupler 230, the output end of photo-coupler 230 is connected, otherwise the output end of photo-coupler 230
Shutdown.Two-terminal output scheme 200 can produce outputs state detection signal as a result,.
However, as mentioned above, there is also defects for two-terminal output scheme 200.For example, breaking when controller 210 issues
When the instruction of open relay 220, if monitoring output signal not actual switch-off by outputs state detection signal,
Will be unable to judgement is that the wiring faults of external power supply or the switch of controller 210 do not disconnect.As detailed below, this not true
It is qualitative to may cause serious problem.The table 1 that the detection truth-value table of two-terminal output scheme 200 can be expressed as.
Table 1
It is a kind of important it should be understood that the case where working condition of switching circuit is to work as control in actual application scenarios
When device 210 processed issues the instruction for disconnecting switch, if actually detected switch state is 0 (no-voltage), at this moment two
Terminal output scheme 200 can not learn that truth is external power supply or load falls off or the contact of the switch of controller 210
Adhesion.If it is the contact adhesion of the switch of controller 210, then controller 210 needs to issue emergency-stop signal to ensure
The safety of circuit.If external power supply or load fall off, then need to only issue fault message or warning message to notify
Maintenance personal repairs.
In order to solve the problems, such as above-mentioned present in existing controller switches circuit and other are various, the implementation of the disclosure
Example proposes the detection circuit and a kind of method of detection switch circuit of a kind of switching circuit.Firstly, embodiment of the disclosure
Scheme uses the scheme of two-terminal output, to solve the problems, such as that the circuit board space of controller switches circuit is limited and appearance
The problem of easy mis-wired.Secondly, the scheme of embodiment of the disclosure solves two-terminal wiring side by special circuit design
The working condition test problems of case.Especially in the higher application of security requirement, the work of this closed loop detection switch
State is necessary.In addition, conventional component and conventional software algorithm can be used in the scheme of embodiment of the disclosure, because
This is easy to using it is practicable that simulation result, which also demonstrates the program,.The reality of the disclosure is described below with reference to Fig. 3-6
Apply the scheme of example.
Fig. 3 shows the functional block diagram of detection switch circuit 300 according to an embodiment of the present disclosure.As shown in Figure 3
, controller 310 includes switch 311, is used to control the connecting and disconnecting of controlled circuit.In some embodiments, switch 311
It can be relay switch, microswitch, semiconductor switch, transistor switch etc..In the example shown in Fig. 3, controlled circuit
It specifically include client power supply 320 and client load 330.In addition, showing electric current using solid arrow in Fig. 3
Flow direction, and dotted arrow is used to indicate to control the flow direction of signal.
As shown in figure 3, controller 310 further includes the first observation circuit 313, it is used to determine related with switch 311
One state 316.For example, first state 316 may include that switch 311 is to turn on or disconnects, namely whether 311 both ends of switch deposit
In voltage.In some embodiments, the first logical value (for example, the logic one indicated with high level) can be used to indicate to switch
311 disconnect, and indicate switch 311 using the second logical value (for example, the logical zero indicated with low level) and be closed.
Specifically, in some embodiments, the first observation circuit 313 can in response to switch 311 disconnection and determine the
One state 316 is the first logical value, such as the logic one indicated with high level.In addition, the first observation circuit 313 can also respond
In switch 311 closure and to determine first state 316 be the second logical value, such as the logical zero indicated with low level.
As shown in figure 3, controller 310 further includes monitoring load 312, be connected on switch 311 and controlled circuit (for example,
Client power supply 320 and client load 330) between.Therefore, switch 311, monitoring load 312, client power supply 320 and visitor
Family end load 330 will form closed circuit when switch 311 is closed, and the electric current of the closed circuit will flow through monitoring load 312.?
In some embodiments, monitoring load 312 can be in response to flowing through the variation of the electric current of monitoring load 312 and in monitoring load 312
Upper generation voltage, so as to the curent change being used in detection switch circuit 300.
As shown in figure 3, controller 310 further includes the second observation circuit 314, it is used to determine related with monitoring load 312
The second state 317.For example, the second state 317 may include that the electric current monitored in load 312 whether there is variation, Ye Jijian
It surveys and whether there is voltage in load 312.In some embodiments, first logical value can be used (for example, indicating with high level
Logic one) to indicate to monitor, there are voltages in load 312, and the second logical value of use is (for example, the logic indicated with low level
Zero) voltage is not present on 312 to indicate that monitoring loads.
Specifically, in some embodiments, the second observation circuit 314 can be in response to there are voltages in monitoring load 312
And determining the second state 317 is the first logical value, such as the logic one indicated with high level.In addition, the second observation circuit 314 is also
It can determine that the second state 317 is the second logical value in response to voltage is not present in monitoring load 312, such as with low level table
The logical zero shown.
As shown in figure 3, controller 310 further comprises decision circuitry 315, it is configured as based on 316 He of first state
Second state 317 determines the working condition of switching circuit 300.In some embodiments, the working condition packet of switching circuit 300
Include that normal operation, switch breaks down (for example, adhesion), external cabling (for example, wiring of external power supply or load) falls off.
For example, being the first logical value and second in response to first state 316 when switching circuit 300 is in startup stage
State 317 is the second logical value, and decision circuitry 315 can determine that the wiring of switching circuit 300 is normal.In response to first state
316 is the second logical values and the second state 317 is the second logical value, and decision circuitry 315 can determine the wiring of switching circuit 300
It breaks down.
For another example becoming in response to first state 316 from the first logical value when switching circuit 300 is in the operation phase
Second logical value and the second state 317 are the second logical value, and decision circuitry 315 can determine that the wiring of switching circuit 300 occurs
Failure.Becoming the second logical value and the second state 317 from the first logical value in response to first state 316 is the first logical value, is sentenced
Deenergizing 315 can determine that switching circuit 300 operates normally.
In addition, being the first logical value and second in response to first state 316 when switching circuit 300 is in the operation phase
State 317 is the second logical value, and decision circuitry 315 can determine that switch 311 breaks down.It is the in response to first state 316
Two logical values and the second state 317 are the first logical value, and decision circuitry 315 can determine that event occurs for the wiring of switching circuit 300
Barrier.
In addition, becoming from the second logical value in response to first state 316 when switching circuit 300 is in the operation phase
One logical value and the second state 317 are the first logical value, and decision circuitry 315 can determine that switching circuit 300 operates normally.Response
In first state 316 be the second logical value and the second state 317 is the second logical value, and decision circuitry 315 can determine switch 311
It breaks down.
In some embodiments, following truth table 2 can be used to indicate in the above-mentioned decision logic of decision circuitry 315.
From following truth table 2 as can be seen that the scheme of embodiment of the disclosure realizes all time of days to switching circuit 300
Monitoring.
Table 2
In some embodiments, decision circuitry 315 can at least partly be held by one or more hardware logic components
Row.For example, the hardware logic component for the exemplary types that can be used includes: field programmable gate as unrestricted example
Array (FPGA), specific integrated circuit (ASIC), Application Specific Standard Product (ASSP), system on chip system (SOC), load can
Programmed logic equipment (CPLD) etc..
Moreover, it is judged that circuit 315 can also be realized by program code, program code can be compiled using one or more
Any combination of Cheng Yuyan is write.These program codes can be supplied to general purpose computer, special purpose computer or other can compile
The processor or controller of journey data processing equipment, so that program code makes flow chart when by processor or controller execution
And/or function/operation of defined is carried out in block diagram.Program code can execute completely on machine, partly in machine
Upper execution, as independent software package partly on machine execute and partly on the remote machine execute or completely in remote machine
It is executed on device or server.
Fig. 4 shows the circuit diagram of the detection circuit 400 according to an embodiment of the present disclosure for switching circuit 300.?
In the example of Fig. 4, switch 311 includes switch U2, can be relay switch, microswitch, semiconductor switch, transistor and opens
Close etc..Monitoring load 312 includes the inductor L1 and resistor R2 being connected in parallel.Client power supply 320 includes power supply V1, and objective
Family end load 330 includes R1.In addition, for sake of simplicity, Fig. 4 does not describe decision circuitry 315.It should be understood that the various circuits in Fig. 4
The model of element and specific value are merely exemplary, it is not intended to carry out any restrictions to embodiment of the disclosure.
In the example of fig. 4, the first observation circuit 313 may include the light with input port 1-2 and output port 3-4
Coupler U4.Photo-coupler U4 input port 1-2 detection due to switch 311 disconnection and in the input circuit of photo-coupler U4
The electric current of middle generation.For example, the input circuit of photo-coupler U4 includes resistor R7, R8 and diode in example in Fig. 4
D3。
In addition, the output port 3-4 of photo-coupler U4 in response to the electric current in input circuit presence and be not present and divide
The first logical value and the second logical value are not exported.For example, indicating the first logical value and the second logical value in example in Fig. 4
Low and high level realized especially by power supply V3 and resistor R9.
In the example of fig. 4, the second observation circuit 314 may include the light with input port 1-2 and output port 3-4
Coupler U7.Input of the input port 1-2 detection of photo-coupler U7 by the voltage in monitoring load 312 in photo-coupler U7 is returned
The electric current generated in road.For example, the input circuit of photo-coupler U7 includes resistor R3, R4 and R10 in example in Fig. 4
And diode D2 and D4.In addition, the input port 1-2 of photo-coupler U7 different from the detection photo-coupler U4 of unidirectional voltage
It can detecte the voltage of both direction.
In addition, the output port 3-4 of photo-coupler U7 in response to the electric current in input circuit presence and be not present and divide
The first logical value and the second logical value are not exported.For example, indicating the first logical value and the second logical value in example in Fig. 4
Low and high level realized especially by power supply V2 and resistor R5.
Fig. 5 shows the result analogous diagram of the detection circuit 400 according to an embodiment of the present disclosure for switching circuit 300
500.Specifically, Fig. 5 is depicted in circuit shown in Fig. 4, emulation when disconnecting at the 20ms of switch 311 on a timeline
As a result.
As shown in figure 5, curve 510 depicts the voltage curve of first state 316, and curve 520 depicts the second state
317 voltage curve.As can be seen that first state 316 in response to switch 311 disconnection and detect high level, and the second shape
State 317 in response to switch 311 disconnection and detect the pulse of about 11ms.This corresponded in the operation phase in truth table 2
Switch be in closure and external cabling it is normal, switch in response to open command normally open situation.
Fig. 6 shows the flow chart of the method 600 according to an embodiment of the present disclosure for detection switch circuit 300.?
In some embodiments, the switching circuit 300 that method 600 is directed to controls the connecting and disconnecting of controlled circuit using switch 311.?
In some embodiments, method 600 can be executed by the detection circuit 400 described in Fig. 4.
As shown in fig. 6, determining first state related with switch 311 using the first observation circuit 313 at frame 610
316.In some embodiments, determine related with switch 311 first state 316 may include: in response to the disconnection of switch 311 and
Determine that first state 316 is the first logical value；And being closed in response to switch 311 and determine first state 316 is the second logic
Value.
In some embodiments, the first observation circuit 313 may include having input port 1-2 and output port 3-4
First photo-coupler U4, input port 1-2 are configured as detecting the disconnection due to switch 311 and in the defeated of the first photo-coupler U4
The first electric current generated in entry loop, output port 3-4 are configured to respond to the presence of the first electric current and are not present and distinguish
Export the first logical value and the second logical value.
At frame 615, is determined using the second observation circuit 314 and load 312 related second states 317 with monitoring, wherein
Monitoring load 312 is connected between switch 311 and controlled circuit.In some embodiments, method 600 may further include:
Voltage is generated using monitoring load 312 come the variation in response to the second electric current for flowing through monitoring load 312.In some embodiments
In, monitoring load 312 may include the inductor L1 and resistor R2 being connected in parallel.
In some embodiments, determine that with monitoring 312 related second states 317 of load may include: in response to monitoring
Determine that the second state 317 is the first logical value there are voltage in load 312；And in response to being not present in monitoring load 312
Voltage and determine the second state 317 be the second logical value.
In some embodiments, the second observation circuit 314 may include having input port 1-2 and output port 3-4
Second photo-coupler U7, input port 1-2 are configured as detecting by the voltage in monitoring load 312 the second photo-coupler U7's
The second electric current generated in input circuit, output port 3-4 are configured to respond to the presence of the second electric current and are not present and divide
The first logical value and the second logical value are not exported.
At frame 620, switching circuit is determined based on first state 316 and the second state 317 using decision circuitry 315
300 working condition.In some embodiments, if determining that the working condition of switching circuit 300 may include: switching circuit
300 are in startup stage, and in response to first state 316 be the first logical value and the second state 317 is the second logical value, and determination is opened
The wiring on powered-down road 300 is normal；It and be the second logical value and the second state 317 in response to first state 316 is the second logic
Value, determines that the wiring of switching circuit 300 is broken down.
In some embodiments, if determining that the working condition of switching circuit 300 may include: that switching circuit 300 is in
Operation phase becomes the second logical value from the first logical value in response to first state 316 and the second state 317 is the second logic
Value, determines that the wiring of switching circuit 300 is broken down；Become the second logical value from the first logical value in response to first state 316
And second state 317 be the first logical value, determine switching circuit 300 operate normally；It is the first logic in response to first state 316
Value and the second state 317 are the second logical value, determine that switch 311 breaks down；It is the second logical value in response to first state 316
And second state 317 be the first logical value, determine that the wiring of switching circuit 300 is broken down；In response to first state 316 from
Two logical values become the first logical value and the second state 317 is the first logical value, determine that switching circuit 300 operates normally；And
In response to first state 316 be the second logical value and the second state 317 is the second logical value, determines that switch 311 breaks down.
It should be noted that embodiment of the disclosure can be realized by the combination of hardware, software or software and hardware.Firmly
Part part can use special logic to realize；Software section can store in memory, by instruction execution system appropriate,
Such as microprocessor or special designs hardware execute.It will be appreciated by those skilled in the art that above-mentioned device and method can
It is realized with using computer executable instructions and/or being included in the processor control code, such as in programmable memory
Or such code is provided in the data medium of such as optics or electrical signal carrier.
In addition, although describing the operation of disclosed method in the accompanying drawings with particular order, this do not require that or
Person implies must execute these operations in this particular order, or has to carry out operation shown in whole and be just able to achieve expectation
Result.On the contrary, the step of describing in flow chart can change and execute sequence.Additionally or alternatively, it is convenient to omit Mou Xiebu
Suddenly, multiple step groups are combined into a step to execute, and/or a step is decomposed into execution of multiple steps.It shall also be noted that
It can be embodied in one apparatus according to the feature and function of two or more devices of the disclosure.Conversely, above-described
The feature and function of one device can be to be embodied by multiple devices with further division.
Although describing the disclosure by reference to several specific embodiments, but it is to be understood that it is public that the present disclosure is not limited to institutes
The specific embodiment opened.The disclosure is intended to cover in spirit and scope of the appended claims included various modifications and equivalent
Arrangement.
Claims (18)
1. a kind of detection circuit of switching circuit, the switching circuit controls the connecting and disconnecting of controlled circuit using switch,
The detection circuit includes:
First observation circuit is configured to determine that the related first state with the switch；
Monitoring load is configured as being connected between the switch and the controlled circuit；
Second observation circuit is configured to determine that and loads related second state with the monitoring；And
Decision circuitry is configured as determining the work shape of the switching circuit based on the first state and second state
State.
2. detection circuit according to claim 1, wherein first observation circuit is configured to:
Disconnecting in response to the switch and determine first state is the first logical value；And
Determine that first state is the second logical value in response to described close the switch.
3. detection circuit according to claim 2, wherein first observation circuit includes having input port and output
First photo-coupler of port, the input port are configured as detecting the disconnection due to the switch and in first optocouplers
The first electric current generated in the input circuit of clutch, the output port be configured to respond to first electric current presence and
It is not present and exports first logical value and second logical value respectively.
4. detection circuit according to claim 1, wherein monitoring load is configured to:
Voltage is generated in response to flowing through the variation of the second electric current of the monitoring load.
5. detection circuit according to claim 4, wherein the monitoring load includes the inductor and resistance being connected in parallel
Device.
6. detection circuit according to claim 1, wherein second observation circuit is configured to:
In response to determining that the second state is the first logical value there are voltage in monitoring load；And
In response to determining that the second state is the second logical value there is no voltage in monitoring load.
7. detection circuit according to claim 6, wherein second observation circuit includes having input port and output
Second photo-coupler of port, the input port are configured as detecting by the voltage in the monitoring load in second light
The second electric current generated in the input circuit of coupler, the output port are configured to respond to the presence of second electric current
First logical value and second logical value are exported respectively with being not present.
8. detection circuit according to claim 1, wherein the decision circuitry is configured to:
If the switching circuit is in startup stage,
In response to the first state be the first logical value and second state is the second logical value, determines the switching circuit
Wiring it is normal；And
In response to the first state be the second logical value and second state is the second logical value, determines the switching circuit
Wiring break down.
9. detection circuit according to claim 1, wherein the decision circuitry is configured to:
If the switching circuit is in the operation phase,
Become the second logical value from the first logical value in response to the first state and second state is the second logical value, really
The wiring of the fixed switching circuit is broken down；
Become the second logical value from the first logical value in response to the first state and second state is the first logical value, really
The fixed switching circuit operates normally；
In response to the first state be the first logical value and second state is the second logical value, determines that the switch occurs
Failure；
In response to the first state be the second logical value and second state is the first logical value, determines the switching circuit
Wiring break down；
Become the first logical value from the second logical value in response to the first state and second state is the first logical value, really
The fixed switching circuit operates normally；And
In response to the first state be the second logical value and second state is the second logical value, determines that the switch occurs
Failure.
10. a kind of method of detection switch circuit, the switching circuit controls the connecting and disconnecting of controlled circuit using switch,
The described method includes:
Utilize the determining first state related with the switch of the first observation circuit；
Related second state is loaded with the monitoring using the second observation circuit is determining, the monitoring load in series is opened described
It closes between the controlled circuit；And
The working condition of the switching circuit is determined based on the first state and second state using decision circuitry.
11. according to the method described in claim 10, wherein determining that related first state includes: with the switch
Disconnecting in response to the switch and determine first state is the first logical value；And
Determine that first state is the second logical value in response to described close the switch.
12. according to the method for claim 11, wherein first observation circuit includes having input port and output end
Mouthful the first photo-coupler, the input port be configured as detecting the disconnection due to the switch and in first optical coupling
The first electric current generated in the input circuit of device, the output port are configured to respond to the presence and not of first electric current
In the presence of and export first logical value and second logical value respectively.
13. according to the method described in claim 10, further comprising:
Voltage is generated using the monitoring load come the variation in response to the second electric current for flowing through the monitoring load.
14. according to the method for claim 13, wherein the monitoring load includes the inductor and resistor being connected in parallel.
15. according to the method described in claim 10, wherein determining that loading related second state with the monitoring includes:
In response to determining that the second state is the first logical value there are voltage in monitoring load；And
In response to determining that the second state is the second logical value there is no voltage in monitoring load.
16. according to the method for claim 15, wherein second observation circuit includes having input port and output end
Second photo-coupler of mouth, the input port are configured as detecting by the voltage in the monitoring load in second optocoupler
The second electric current generated in the input circuit of clutch, the output port be configured to respond to second electric current presence and
It is not present and exports first logical value and second logical value respectively.
17. according to the method described in claim 10, wherein determining that the working condition of the switching circuit includes:
If the switching circuit is in startup stage,
In response to the first state be the first logical value and second state is the second logical value, determines the switching circuit
Wiring it is normal；And
In response to the first state be the second logical value and second state is the second logical value, determines the switching circuit
Wiring break down.
18. according to the method described in claim 10, wherein determining that the working condition of the switching circuit includes:
If the switching circuit is in the operation phase,
Become the second logical value from the first logical value in response to the first state and second state is the second logical value, really
The wiring of the fixed switching circuit is broken down；
Become the second logical value from the first logical value in response to the first state and second state is the first logical value, really
The fixed switching circuit operates normally；
In response to the first state be the first logical value and second state is the second logical value, determines that the switch occurs
Failure；
In response to the first state be the second logical value and second state is the first logical value, determines the switching circuit
Wiring break down；
Become the first logical value from the second logical value in response to the first state and second state is the first logical value, really
The fixed switching circuit operates normally；And
In response to the first state be the second logical value and second state is the second logical value, determines that the switch occurs
Failure.
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| CN201710911792.1A CN109581209A (en) | 2017-09-29 | 2017-09-29 | The state-detection of the two-terminal output of controller switches |
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| CN201710911792.1A CN109581209A (en) | 2017-09-29 | 2017-09-29 | The state-detection of the two-terminal output of controller switches |
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