CN108107357A - Switching signal detection circuit with self-diagnostic function - Google Patents
Switching signal detection circuit with self-diagnostic function Download PDFInfo
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- CN108107357A CN108107357A CN201711448135.4A CN201711448135A CN108107357A CN 108107357 A CN108107357 A CN 108107357A CN 201711448135 A CN201711448135 A CN 201711448135A CN 108107357 A CN108107357 A CN 108107357A
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/30—Structural combination of electric measuring instruments with basic electronic circuits, e.g. with amplifier
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Abstract
The present invention provides the switching signal detection circuits with self-diagnostic function, belong to metering signal detection field, including：Resistance R1, and the resistance R2 to connect with resistance R1, POW_CTR pins are equipped in the one end of resistance R1 away from resistance R2, SW_IO pins and capacitance C1 are equipped between resistance R1, resistance R2, one end ground connection of the capacitance C1 away from SW_IO pins, the other ends of the resistance R2 away from resistance R1 is switching signal input interface.By interrupting or inquiring about detection method, the software approach such as ADC detection methods and the controllable mode of hardware circuit power supply cooperate, it realizes on the premise of detection work is met, with lower power consumption, when input signal short circuit, can timing intermission power supply method be automatically switched to by the power supply of control circuit and coordinate inquiry detection method, avoided generating extra power consumption, influence product power supply service life.
Description
Technical field
The invention belongs to metering signal detection field, the switching signal detection circuit more particularly to self-diagnostic function.
Background technology
With the development of the times with the progress of science and technology, smart instrumentation popularized.Switching value technology is because of tool
Have the advantages that simple, reliable, at low cost, be used widely in smart instrumentation.If button trigger, valve in place, flow
Count metrical pulse signal of output etc..In above application, detecting system can first pass through external interface and receive on-off model, warp
Signal is passed to controller by decompression or filtering etc. after processes, then by internal interface, carries out final analysis and processing.
Since the use environment of intelligence instrument is complicated and radix is huge, interface inevitably breaks down.
Such as：When the short circuit of interior external tapping or internal interface are opened a way and when being interfered, it is big to lead to the problem of power consumption, and only in electricity
It when pond electricity has consumed, can just identify, cause the waste of energy；When the connection signal wire hair between external interface and signal source
It during raw broken string, can not be identified, can only be investigated after finding without counting by its Interface status in the prior art
And repair.The economic dispute so be easy to causeing between enterprise and user, service provider and consumer.
Therefore, it is highly desirable to increase self-diagnostic function in intelligence instrument, it is ensured that when a failure occurs it, can examine in time
It measures failure cause and carries out respective handling, so as not to influence the normal operation of other function modules.Summarizing the prior art
The deficiency of middle switching value method herein by taking industrial Intelligent gas meter based on internet of things as an example, devises low-power consumption and can be timely
Detect inside and outside interface fault, a kind of switching value system with self-diagnostic function effectively solves above-mentioned reality
Border problem.
The content of the invention
In order to solve shortcoming and defect in the prior art, the present invention provides interrupt with inquiry detection method to switch
Signal is detected, so as to reduce the switching signal detection circuit with self-diagnostic function of detection power consumption.
In order to reach above-mentioned technical purpose, on the one hand the present invention provides the switching signals with self-diagnostic function to detect electricity
Road, the switching signal detection circuit, including：
The resistance R1 and resistance R2 to connect with resistance R1, draws in the one end of resistance R1 away from resistance R2 equipped with POW_CTR
Foot is equipped with SW_IO pins and capacitance C1, one end ground connection of the capacitance C1 away from SW_IO pins, electricity between resistance R1, resistance R2
It is switching signal input interface to hinder the other ends of the R2 away from resistance R1.
Optionally, it is connected with signal wire burn out detection on the switching signal input interface of the switching signal detection circuit
Circuit；
Switch detection circuit is connected in the output terminal of the signal wire break detection circuit, breaks in the signal wire and examines
The output terminal of slowdown monitoring circuit is connected with
Passive signal output circuit or
Active signal output circuit or
Passive signal output circuit and active signal output circuit；
Wherein, signal is also associated between the output terminal of signal wire break detection circuit and active signal output circuit to turn
Change circuit.
Optionally, in the signal wire break detection circuit, equipped with triode Q1, it is connected in the base stage of triode Q1
The first control terminal of control signal is sent, resistance R4 is equipped between control terminal and base stage, is connected at the collector of triode Q1
It is connected to resistance R3, the emitter ground connection of triode Q1.
Optionally, in the switching signal detection circuit, source signal conversion circuit is additionally provided with, including：
Include source follower circuit, including metal-oxide-semiconductor Q3 and triode Q4, the grid of metal-oxide-semiconductor Q3 and the current collection of triode Q4
Extremely it is connected, the drain electrode of metal-oxide-semiconductor Q3 is through diode D2 connection signaling conversion circuits；
Resistance R7 is equipped between the collector of triode Q4 and the source electrode of metal-oxide-semiconductor Q3, the base stage of triode Q4 is through resistance
R8 is connected with the second control terminal.
Optionally, the active signal conversion circuit for further including and having source follower circuit to connect in the active signal circuit,
Including：
The drain electrode connecting valve signal input interface of metal-oxide-semiconductor Q2, metal-oxide-semiconductor Q2, the source electrode ground connection of metal-oxide-semiconductor Q2, metal-oxide-semiconductor Q2's
Grid is connected with resistance R5, is grounded in the one end of resistance R5 away from metal-oxide-semiconductor Q2 through resistance R6, resistance R6 is away from the another of ground terminal
End connection signal output apparatus.
Optionally, it is described to be gone back between the input interface of switch detection circuit and the output terminal of signal wire break detection circuit
Equipped with voltage protection circuit, the output terminal of voltage protection circuit is as external interface.
On the other hand, the embodiment of the present invention further includes the switching signal detection side applied to the switching signal detection circuit
The step of method, the switching signal detection method includes internal interface open circuit detection, it is specially：
SW_IO pins in switch detection circuit are set to output state, POW_CTR pins are set to input state；
SW_IO pins is made first to export high level, it is rear to export low level or SW_IO pins is made first to export low level, it is rear to export
High level, the level signal exported by POW_CTR pins to SW_IO pins are detected；
If when SW_IO pins first export high level, export low level afterwards, POW_CTR first detects high level, then examines
Low level is measured, illustrates that SW_IO pins, POW_CTR pins are normal；
If when SW_IO pins first export low level, export high level afterwards, POW_CTR first detects low level, then examines
High level is measured, illustrates that SW_IO pins, POW_CTR pins are normal；
If level change is not detected, illustrate that internal interface breaks down.
Optionally, the switching signal detection circuit, further includes signal wire wire break detection method, is specially：
Passive signal input interface is not triggered or active signal input interface CTR2 output low levels, metal-oxide-semiconductor Q2 are in
During cut-off state, external interface is in vacant state.
Using timing detection pattern, if timing is Tf3, when timing is not timed out, the output of CTR1 pins is low electricity
Flat, triode Q1 cut-offs, sampling resistor R3 is in vacant state, and no current circuit when break detection circuit does not work, does not generate
Current drain.
Optionally, the signal wire wire break detection method, further includes：
When switch is not triggered, i.e., external interface is in vacant state, is input state by POW_CTR pin configuration,
CTR1 pins export high level, and SW_IO pins are using multiplexing Chip Microcomputer A/D function, that is, analog to digital conversion function；
Sampling resistor accesses/disconnects control line CTR1 output high level, and sampling resistor is accessed signal bus, pull-up resistor
R1 and protective resistance R2, voltage protection diode D1, sampling resistor R3 contact and divide, and pass through triode Q1 and be connected to GND
Current loop is formed, SW_IO pins carry out AD voltage samples to sampling resistor；
If sampled voltage is less than threshold value Vt, judge that signal wire connection is normal；If sampled voltage is higher than threshold value Vt,
It can determine whether as broken string state；Vt scopes are 0~0.62V preferably, Vt threshold values are obtained according to actual samples voltage；
After the completion of sampling, sampling resistor is accessed/disconnected control line CTR1 output low levels, other two pin by controller
It is restored to switching signal detection working condition.
Optionally, it is described to work as timing Tf3 then, the work of signal wire break detection circuit, including：
The output of POW_CTR pins is high level, and for SW_IO pins using AD functions are multiplexed with, i.e. analog to digital converts work(
Can, sampling resistor accesses/disconnects control line CTR1 output high level, and sampling resistor is accessed signal bus；
Pull-up resistor R1 and protective resistance R2, voltage protection diode D1, sampling resistor R3 contact and divide, and pass through three
Pole pipe Q1 is connected to GND and forms current loop, and SW_IO pins carry out AD samplings at this time, according to sampled result combination formula 1,2,3
Judged；
Work as no signal, when external interface is hanging,
V3=V1 × (R2+R3)/(R1+R2+R3)+V2, formula 1；
When there is a signal, when external interface is low level, V3=V1 × R2/ (R1+R2)+V2, formula 2；
When break state when, V3=V1, formula 3；
In above-mentioned ADC sampled voltages calculation formula, if voltage V1 is POW_CTR pin voltages, V2 is protection diode
Operating voltage, V3 are SW_IO pin AD sampled voltages.
The advantageous effect that technical solution provided by the invention is brought is：
1st, by on-off model detection circuit, switching value software algorithm, (signal wire breaks self diagnosis software algorithm
Detection and the detection of internal interface open circuit), the mutual cooperation of wireless communication function makes product in use, can monitor automatically
On off state and Interface status, including：When the input signal cable broken string being connected with external interface or the control being connected with internal interface
Device pin desoldering processed etc. can detect to carry out processing, and pass through remote alarms and notify related personnel in time when occurring abnormal.
It 2nd, can be controllable by interrupting or inquiring about the software approach such as detection method, ADC detection methods and hardware circuit power supply
Mode cooperates, and realizes on the premise of detection work is met, has lower power consumption, can when input signal short circuit
Timing intermission power supply method is automatically switched to by the power supply of control circuit, and coordinates inquiry detection method, avoids generating work(
Consumption, influences product power supply service life.
4th, realize to compatibility active or without source input signal.By switching signal detection circuit and active to passive signal
The design of conversion circuit, then with combination switch inspection software algorithm, realizes the input of passive or active signal, different active of voltage
Signal inputs, the compatibility of normally opened and normally closed input signal, the mixing of one or more single input signals.
5th, it is controllable by detection circuit power supply, when product by long-term use after, component can be reduced due to device aging and
The probability of failure.In addition, when circuit breaks down, power supply can be disconnected, protect the circuit in product from shadow
It rings.
Description of the drawings
It, below will be to attached drawing needed in embodiment description in order to illustrate more clearly of technical scheme
It is briefly described, it should be apparent that, the accompanying drawings in the following description is only some embodiments of the present invention, general for this field
For logical technical staff, without creative efforts, other attached drawings are can also be obtained according to these attached drawings.
Fig. 1 is the structure diagram of the switching signal detection circuit provided by the invention with self-diagnostic function；
Fig. 2 is the structure diagram of passive switch signal deteching circuit provided by the invention；
Fig. 3 is the structure diagram of active signal conversion circuit provided by the invention；
Fig. 4 is the structure diagram of external interface signals line break detection circuit provided by the invention；
Fig. 5 is the structure diagram of voltage protection circuit provided by the invention；
Fig. 6 is the flow diagram of internal interface open circuit detection provided by the invention；
Fig. 7 is the alternative flow diagram of internal interface open circuit detection provided by the invention；
Fig. 8 is the flow diagram of signal wire wire break detection method provided by the invention；
Fig. 9 is the system block diagram provided by the invention based on switching signal detection circuit.
Specific embodiment
To make the structure of the present invention and advantage clearer, the structure of the present invention is made further below in conjunction with attached drawing
Description.
Embodiment one
On the one hand the present invention provides the switching signal detection circuit with self-diagnostic function, as shown in Figure 1, the switch
The concrete structure of signal deteching circuit is the resistance R1 and resistance R2 to connect with resistance R1, in resistance R1 away from resistance R2's
One end is equipped with POW_CTR pins, SW_IO pins and capacitance C1 is equipped between resistance R1, resistance R2, capacitance C1 is away from SW_IO
One end ground connection of pin, the other ends of the resistance R2 away from resistance R1 are switching signal input interface.
In force, switch detection circuit POW_CTR is connected with controller pin, SW_IO and another pin of controller
Connection.R1, when button is not pressed, makes the drawing of SW_IO pins put the definite state of high level as pull-up resistor.Resistance R2 makees
For protective resistance and sampling resistor.In passive switch signal deteching circuit, as protective resistance, when SW_IO pins export height
Button is pressed when turn on GND level simultaneously, prevents that SW_IO and GND is short-circuit.Sampling resistor function is for detection circuit event
Barrier uses when breaking.
100k may be selected for R1 resistances preferably, Type Selection Principle：
(1) when button is not pressed, according to controller data handbook (databook is different, and voltage is different), in this control
In device processed, high level differentiates that voltage threshold is：SW_IO pin voltages are higher than 0.7 times of POW_CTR high level voltages.Such as
When POW_CTR high level voltages are 3V, SW_IO pin voltages are more than 2.1V.
(2) when the button is pressed, the electric current of generation is more low better.The low level judgement of controller pin can be according to control
Device databook designs, and in this controller, low level differentiates that voltage threshold is：The voltage of SW_IO pins is less than 0.3 times
POW_CTR high level voltages.Such as：POW_CTR voltages are 3V, and 100k resistance of contacting, maximum generates electric current and is
I0=30uA.SW_IO pin voltages are less than 0.9V.
Preferably, when button is not pressed, R2 resistance does not work 100 Ω of R2 resistance selections.When the button is pressed,
R1 connects with R2 resistance, and forms bleeder circuit, and the voltage after partial pressure will follow the sampling principle of SW_IO.
Such as：After button is pressed, SW_IO pin voltages are less than 0.9V, then calculation formula：
→POW_CTR×R2/(R1+R2)<0.9V
→R2<42k
C1 filter capacitor capacitance type selectings：C1 filter capacitors scope can be between (0.01nF~1uF).The present invention is in order to simultaneous
Hold burn out detection function, using the nonpolarity ceramic condensers of 0.1nF as preferred.
Based on the switching signal detection circuit hereinbefore proposed, passive signal and active signal can be detected.
Passive signal refers to the on-off model that can export low level and vacant state, and button, tongue tube, relay etc. may be employed
Switching device or similar device.The preferred button of the embodiment of the present invention is as simulation passive switch amount input signal source.Active signal
Refer to that low level and high level state can be exported or export hanging and high level state on-off model, tool may be employed
There is the equipment or instrument of on-off model as input signal source, such as：The on-off model of gas flowmeter output.
It can individually be inputted, can also be total to as switching signal using passive signal output circuit or active signal output circuit
It is inputted with as switching signal.During using passive switch signal as input signal, active signal conversion circuit can not be selected and had
Source signal output circuit.Turn, it is necessary to which active output interface is connected to signal when using active switch signal as input signal
The Vin of circuit is changed, after signal is converted, signal bus OUT is connected to, is linked into the external interface of switch detection circuit.
Passive switch signal deteching circuit is proposed in Fig. 2, including switch detection circuit and passive signal output circuit, is used
It is detected in passive signal.Switch detection circuit POW_CTR is connected with controller pin, SW_IO and controller another
Pin connects.R1, when button is not pressed, makes the drawing of SW_IO pins put the definite state of high level as pull-up resistor.
Resistance R2 is as protective resistance and sampling resistor.In passive switch signal deteching circuit, as protective resistance, when
SW_IO pins export high level while button is pressed when being turned on GND, prevent SW_IO and GND short circuits.Sampling resistor function
It is for detection circuit failure, that is, is used when breaking.Sampling resistor function is addressed below.
Capacitance C1 is the filter capacitor of switching signal sampling end in switch detection circuit, and effect is after button is pressed,
Resistance R2 turns on moment with GND, filters out keyboard mechanical shaking interference signal, controller is made not generate erroneous judgement.Believed according to switch
It is different that the type of S1 is switched in number detection circuit, the testing principle of switching signal detection circuit is described respectively.
Button uses normally opened type, when circuit works normally
1. when button is not pressed, controller exports POW_CTR pin configuration output states for high level.Control
SW_IO pin configuration is input state by device processed, and SW_IO pins can detect current state as high electricity by pull-up resistor R1
It is flat.Since POW_CTR with SW_IO pin level states are identical, discharge loop can not be formed, therefore, is generated without electric current.At this time
Inquiry mode may be employed in controller or whether interrupt mode detection button S1 is pressed.
2. when button S1 is pressed, resistance R2 is drawn by button connecting pin puts GND, POW_CTR pins, R1, R2,
GND series windings form circuit.And after R1 and R2 series winding partial pressures, the low level voltage signal after partial pressure is passed into SW_IO pins.Control
Device has detected low level signal by SW_IO pins, judges that button is pressed.
After detecting that button is pressed, before operation is performed, first POW_CTR pin levels are configured to by high level low
Level, it is therefore an objective to save the power consumption due to being conducting to GND generations by key pressing.The corresponding operation of button is performed again.Perform completion
Afterwards, timer, timer time Tf1 are enabled (Tf1 can be adjusted according to actual conditions).After timing Tf1 is arrived, stop timing
Device.POW_CTR pins export high level, then the input signal of button is detected with SW_IO pins, if detecting SW_
I/O pin level is still low level, unchanged, then POW_CTR pins are set low, and restarts timer, until SW_IO draws
Foot detection key-press input signal becomes high level again.This button operation terminates.
If button is detected through n times, for detection number more than after threshold value Cn, SW_IO pins detect current button always
Input signal then carries out sound-light alarm, liquid crystal display error code, and passes through the side of telecommunication still in low level state
Warning message is passed to background server by formula, is handled for technical staff.
In above-mentioned detection process, key press detecting circuit using interruption or inquiry mode, such as detected button before this
After being pressed, then using intermittent work mode, it is periodically detected whether button is released, is restored to open-circuit condition.Reach section
Save the purpose of power consumption.If there is button short trouble, whole controlling switch export low level, and circuit power supply is disconnected,
And it alarms.
Opposite, if button uses Closed type, the workflow of the switching signal detection circuit is：
1. controller exports POW_CTR pin configuration output states for low level.Controller matches somebody with somebody SW_IO pins
Input state is set to, R2 is drawn by button connecting pin as pull down resistor and puts GND.SW_IO pins detect that current state is
Low level.
2. whether controller is pressed using timing inquiry mode detection button S1.When timing (T1) time, then (T1 can
Adjusted according to practical application), POW_CTR pins are exported into high level, R1 is divided as pull-up resistor with R2.During wait
Between (T2) capacitance C1 charge after, by SW_IO pins carry out voltage sample.Judge whether SW_IO pin levels become high level.Such as
Fruit detects that SW_IO pins are changed to high level, then can determine whether that button is pressed.Otherwise button is not connect down.After the completion of detection, then
Secondary POW_CTR pins export low level, wait timing to progress cycle detection.Timing is needed in view of capacitance C1's
The charge and discharge time when POW_CTR outputs are high level, needs to wait for time T2, and C1 charges, and after waiting voltage stabilizations, carries out
Detection.When POW_CTR outputs are low level, time T2 is needed to wait for, C1 discharges, and after waiting voltage stabilizations, is detected.
Using timing intermittent power supply and the inquiry matched purpose of detection mode is saved since button is normally off, when
The power consumption that POW_CTR is generated when being high level.
Here stand-by period T2 belongs to general knowledge known in this field, and details are not described herein again.
Based on the switching signal detection circuit that the above, the present embodiment propose, what is diagnosed for switching signal
Solution is：
By switching signal detection circuit and the active design to passive signal conversion circuit, then with combination switch inspection software
Algorithm, realizes passive and active input signal, voltage it is different have a source input signal, normally opened and normally closed input signal it is simultaneous
Hold, the mixing of one or more single input signals.When product by long-term use after, component can be reduced and occurred due to device aging
The probability of failure.In addition, when circuit occurs abnormal due to failure, power supply can be disconnected, to protect the circuit in product
It is unaffected.By the way that power supply power supply control, when timing does not arrive or system does not work, can power detection circuit electricity
Source disconnects, and detection circuit does not work.The service life of product can be extended.
In addition the switching signal detection circuit uses modularized design, can be combined and tear open according to practical application request
Point.It is not only able to solve the problems, such as present in background technology, and whether interface is sent out inside or outside system self-diagnosable circuit
Raw failure.When voltage protection function is not required in circuit, switching signal can be detected interface and be connected to directly as external interface
On signal bus OUT.Do not select voltage protection circuit.When burn out detection function is not required in circuit, signal wire can not be selected to break
Line detection circuit.
When circuit is using passive signal as input signal, can not select active to passive signal conversion circuit and active letter
Number output circuit.It can in addition contain individually defeated as switching signal using passive signal output circuit or active signal output circuit
Enter.It can also be inputted collectively as switching signal, active signal can first be connected to the Vin on signaling conversion circuit, signal is turned
It after changing, is connected on signal bus OUT, accesses external interface.
Optionally, in the switching signal detection circuit, source signal conversion circuit is additionally provided with, including：
Include source follower circuit, including metal-oxide-semiconductor Q3 and triode Q4, the grid of metal-oxide-semiconductor Q3 and the current collection of triode Q4
Extremely it is connected, the drain electrode of metal-oxide-semiconductor Q3 is through diode D2 connection signaling conversion circuits；
Resistance R7 is equipped between the collector of triode Q4 and the source electrode of metal-oxide-semiconductor Q3, the base stage of triode Q4 is through resistance
R8 is connected with the second control terminal.
The active signal conversion circuit for further including and having source follower circuit to connect in the active signal circuit, including：
The drain electrode connection input terminal of metal-oxide-semiconductor Q2, metal-oxide-semiconductor Q2, the source electrode ground connection of metal-oxide-semiconductor Q2, the grid of metal-oxide-semiconductor are connected with electricity
R5 is hindered, is grounded in the one end of resistance R5 away from metal-oxide-semiconductor Q2 through resistance R6, other end connection signals of the resistance R6 away from ground terminal is defeated
Go out circuit.
In force, the structure of active signal conversion circuit is as shown in figure 3, be the need when input signal is active signal
Active signal is converted into passive signal by active signal conversion circuit.Turned in the embodiment of the present invention using metal-oxide-semiconductor signal
Circuit is changed preferably, on the premise of metal-oxide-semiconductor Q2 is used, the operation principle of the signaling conversion circuit is：
When VIN signal outputs are high level, metal-oxide-semiconductor Q2 conductings, VOUT output low levels.When VIN signal outputs are low
Level or it is hanging when, metal-oxide-semiconductor Q2 cut-off, OUT no signals output.
In signaling conversion circuit, metal-oxide-semiconductor Q2 can use metal-oxide-semiconductor or triode Q2 ' mutually to replace.When VIN is in
When vacant state no signal exports, the grid of metal-oxide-semiconductor Q2 is in vacant state, and metal-oxide-semiconductor grid vacantly easily leads to the electrostatic of accumulation
It nowhere releases, there is the hidden danger of breakdown.Pull down resistor R6 plays discharge process.
Resistance R5 resistance values range of choice can be between 0.1k~510k, and resistance R5 uses 10k Ω conducts in the present embodiment
It is preferred that.Resistance R6 resistance values range of choice can be between 0.1k~1.5M, and resistance R6 uses 470k Ω as excellent in the present embodiment
Choosing.
Optionally, it is connected with signal wire break detection circuit on the input terminal of the switching signal detection circuit；
Switch detection circuit is connected in the output terminal of the signal wire break detection circuit, breaks in the signal wire and examines
The output terminal of slowdown monitoring circuit is connected with
Passive signal output circuit or
Active signal output circuit or
Passive signal output circuit and active signal output circuit；
Wherein, signal is also associated between the output terminal of signal wire break detection circuit and active signal output circuit to turn
Change circuit.
In force, in order to realize hereinbefore propose the step of being detected to switching signal, signal wire burn out detection
The concrete structure of circuit is equipped with triode Q1, and the first control terminal for sending control signal is connected in the base stage of triode Q1,
Resistance R4 is equipped between control terminal and base stage, resistance R3, the emitter of triode Q1 are connected at the collector of triode Q1
Ground connection.Wire break detection method based on the signal wire break detection circuit embodies in latter embodiment.
Optionally, the switch signal input end in switch detection circuit and the output terminal of signal wire break detection circuit
Between be additionally provided with voltage protection circuit, the output terminal of voltage protection circuit is as external interface.
In force, as shown in figure 5, between resistance R2 and input signal circuit, the protection diode that can also connect D1.Its
Effect one is when input signal exception, and protection diode D1 reversely ends, and then protection switch detection circuit will not be because of outside
Interface occurs the exception such as short circuit or external input signal overtension and is burned out.
The operation principle of voltage protection diode D1：When the voltage of input signal is low level, at protection diode D1
In conducting state, when input signal is high level or is hanging, protection diode D1 is in cut-off state, and on-off circuit passes through outside
Interface can be detected input signal.
The present invention provides the switching signal detection circuit with self-diagnostic function, including resistance R1 and with resistance R1
The resistance R2 of series connection is equipped with POW_CTR pins in the one end of resistance R1 away from resistance R2, is equipped between resistance R1, resistance R2
SW_IO pins and capacitance C1, one end ground connection of the capacitance C1 away from SW_IO pins, the other ends of the resistance R2 away from resistance R1 is to open
OFF signal input interface.It is controllable by interrupting or inquiring about the software approach such as detection method, ADC detection methods and hardware circuit power supply
Mode cooperate, realize meet detect work on the premise of, have lower power consumption, when input signal short circuit,
Can timing intermission power supply method be automatically switched to by the power supply of control circuit and coordinate inquiry detection method, avoid generation volume
Outer power consumption influences product power supply service life.
Embodiment two
On the other hand, the embodiment of the present invention further includes the switching signal detection side applied to the switching signal detection circuit
Method, as shown in fig. 6, the step of switching signal detection method includes internal interface open circuit detection, is specially：
21st, the SW_IO pins in switch detection circuit are set to output state, POW_CTR pins are set to input state；
22nd, SW_IO pins is made first to export high level, export low level afterwards, it is defeated to SW_IO pins by POW_CTR pins
The level signal gone out is detected；
If the 23, SW_IO pins first export high level, exporting low level afterwards, then POW_CTR first detects high level, then
It detects low level, it is normal that SW_IO pins, POW_CTR pins can be explained；
If level change the 24, is not detected, illustrate that internal interface breaks down.
Alternatively, the content in step 22 can also be that SW_IO pins is made first to export low level, high level is exported afterwards, is passed through
The level signal that POW_CTR pins export SW_IO pins is detected.
According to the replacement content of step 22, step 23 is corresponding can also be if SW_IO pins first export low level, after
High level is exported, then POW_CTR first detects low level, then detects high level, and SW_IO pins, POW_CTR pins can be explained
It is normal.
For step 22,23 interchangeable contents, the switching signal detection method flow chart is as shown in Figure 7.
In force, the protective effect of R2 resistance：If without R2 resistance, when SW_IO pins export high level, just press
Key S1 is in the state being pressed, and will result in SW_IO pins and passes through button S1 and GND short circuits.Increase R2 resistance, work as SW_IO
Pin exports high level, and when button S1 is pressed, since resistance R2 plays metering function, would not cause short circuit, no
Influence level signal detection.It is again output high level by POW_CTR key configurations, by SW_IO pin configuration after the completion of detection
For input state.Carry out normal switching signal detection.
By interrupting or inquiring about the software approach such as detection method, ADC detection methods and the controllable mode of hardware circuit power supply
It cooperates, realizes on the premise of detection work is met, there is lower power consumption, when input signal short circuit, can pass through
Automatically switch the power supply of detection circuit, avoid generating power consumption, influence product power supply service life.
Embodiment three
On the other hand, the embodiment of the present invention further includes the switching signal detection side applied to the switching signal detection circuit
Method, the switching signal detection circuit, further includes signal wire wire break detection method, as shown in figure 8, being specially：
31st, passive signal input interface button S1 is not triggered or active signal input interface CTR2 exports low level, MOS
When pipe Q2 is in cut-off state, input signal is in vacant state.
32nd, using timing detection pattern, timing Tf3, when timing is not timed out, the output of CTR1 pins is low electricity
Flat, triode Q1 cut-offs, sampling resistor R3 is in vacant state, and no current circuit when diagnostic circuit does not work, does not generate electric current
Consumption.
Optionally, it is described to work as timing Tf3 then, the work of signal wire break detection circuit, including：
When switch is not triggered, i.e., external interface is in vacant state, is input state by POW_CTR pin configuration,
CTR1 pins export high level, and SW_IO pins are using multiplexing Chip Microcomputer A/D function, i.e. analog to digital conversion function；
Sampling resistor accesses/disconnects control line CTR1 output high level, and sampling resistor is accessed signal bus, pull-up resistor
R1 and protective resistance R2, voltage protection diode D1, sampling resistor R3 contact and divide, and pass through triode Q1 and be connected to GND
Current loop is formed, SW_IO pins carry out AD voltage samples to sampling resistor；
If sampled voltage is less than threshold value Vt, judge that signal wire connection is normal；If sampled voltage is higher than threshold value Vt,
It can determine whether as broken string state；Vt scopes are 0~0.62V preferably, Vt threshold values are obtained according to actual samples voltage；
After the completion of sampling, sampling resistor accesses/disconnects control line CTR1 output low levels, other two pin is restored to out
OFF signal detects working condition.
In force, when switch is not triggered, i.e., can be input shape by POW_CTR pin configuration in vacant state
State, CTR1 pins output high level, SW_IO pins carry ADC (analog to digital conversion) function using multiplexing microcontroller.Sampling
Resistance accesses/disconnects control line CTR1 output high level, and sampling resistor is accessed signal bus.Pull-up resistor R1 and protective resistance
R2, voltage protection diode D1, sampling resistor R3 contact and divide, and pass through triode Q1 and be connected to GND composition current loops,
SW_IO pins carry out AD voltage samples to sampling resistor at this time, if sampled voltage is 0V, can determine whether signal wire connection just
Often, if sampled voltage is non-zero V, can determine whether as broken string state.After the completion of sampling, sampling resistor accesses/disconnects control line CTR1
Low level is exported, other two pin is restored to switching signal detection working condition.
Optionally, it is described to work as timing Tf3 then, the work of signal wire break detection circuit, including：
The output of POW_CTR pins is high level, and for SW_IO pins using AD functions are multiplexed with, i.e. analog to digital converts work(
Can, sampling resistor accesses/disconnects control line CTR1 output high level, and sampling resistor is accessed signal bus；
Pull-up resistor R1 and protective resistance R2, voltage protection diode D1, sampling resistor R3 contact and divide, and pass through three
Pole pipe Q1 is connected to GND and forms current loop, and SW_IO pins carry out AD samplings at this time, according to sampled result combination formula 1,2,3
Judged；
Work as no signal, when external interface is hanging,
V3=V1 × (R2+R3)/(R1+R2+R3)+V2, formula 1；
When there is a signal, when external interface is low level, V3=V1 × R2/ (R1+R2)+V2, formula 2；
When break state when, V3=V1, formula 3；
In above-mentioned ADC sampled voltages calculation formula, if voltage V1 is POW_CTR pin voltages, V2 is protection diode
Operating voltage, V3 are SW_IO pin AD sampled voltages.
In force, the output of POW_CTR pins is high level, and using ADC is multiplexed with, (analog to digital turns SW_IO pins
Change) function.Sampling resistor accesses/disconnects control line CTR1 output high level, and sampling resistor is accessed signal bus.Pull-up resistor
R1 and protective resistance R2, voltage protection diode D1, sampling resistor R3 contact and divide, and pass through triode Q1 and be connected to GND
Current loop is formed, SW_IO pins carry out AD samplings at this time.Sampled result compares hereafter formula 1, and 2,3 are judged.
When input signal exception (such as：Positive and negative anodes are reversed, short circuit etc.), since CTR1 pin powereds power supply and input are believed
Number power supply differ, therefore, diagnostic circuit is in off working state, will not be affected.
ADC sampled voltage calculation formula
If POW_CTR voltages are V1, protection diode operating voltage is V2, and SW_IO pin AD sampled voltages are V3, then count
Calculating formula is：
1. no signal, interface is hanging
V3=V1 × (R2+R3)/(R1+R2+R3)+V2 (formula 1)
2. there is signal, low level
V3=V1 × R2/ (R1+R2)+V2 (formula 2)
3. break state
V3=V1 (formula 3)
R1, R2, R3 and R4 resistance type selecting：
R1 resistance selections 100k, R2 resistance selection 1k, R3 resistance selection 100k, R4 resistance selection 100k of the present invention is as excellent
Choosing.
V1 voltages use 3V, and protection diode uses Schottky diode, rated operational voltage 0.3V.
1. no signal, interface is hanging or high level state, brings formula 1 into, acquires sampled voltage V3：
V3=V1 × (R2+R3)/(R1+R2+R3)+V2
=1.8V
2. there is signal, low level brings formula 2 into, acquires sampled voltage V3：
V3=V1 × R2/ (R1+R2)+V2
=0.33V
3. break state, formula 3 is brought into, acquire sampled voltage V3：
V3=V1=3V
It should be noted that burn out detection POW_CTR high level guard time T3 explanations：
The timing scope of T3 can select between 20us~1s.The present invention is using 200us as preferred.
The timing of T3 is related to the type selecting of R1 resistance values, C1 capacitances, and to distinguish switch short, open circuit, break three kinds of shapes
State can be drawn by test.
If R1 resistance values and C1 capacitance selective values are larger, C1 needs the longer charging time, just voltage can be made to reach steady
Fixed, when can cause burn out detection, POW_CTR high-level retention times T3 long, average current during periodical line detection detection is big.
If when R1 resistance values and smaller C1 capacitances selection, the charging time of C1 is more short-circuit, but in switch short, then produces
Raw larger short circuit current flow.If the T3 times are short, the capacitance C1 charging time can be caused shorter, carry out AD samplings, Jiu Huizao at this time
It is relatively low into the voltage detected on C1, then button cannot be distinguished in the voltage under tactile state or broken string state.
Based on the switching signal detection circuit and a variety of detection methods proposed above, the embodiment of the present invention also proposed as
System block diagram shown in Fig. 9 based on switching signal detection circuit.
External input signal component includes burn out detection module (being the break detection circuit in previous embodiment), with
And be connected in burn out detection module to generate the passive switch signal of switching signal and active switch signal, it is opened due to active
OFF signal cannot directly export burn out detection module, therefore be additionally provided with signal conversion module (i.e. in active switch signal output part
For the signaling conversion circuit in previous embodiment).
External input signal component is connected to microcontroller through control signal wire, is connected by signal lines through external interface
Voltage protection circuit, voltage protection circuit are connected with switch detection circuit (i.e. switching signal detection circuit).Switch detection circuit
It is connected between microcontroller by internal interface, to realize power supply control and information gathering.Microcontroller is also associated with acousto-optic report
Alert circuit, liquid crystal display circuit and radio communication circuit, to realize the alarm after detecting broken string and to inform control in time
The operations such as end.
It is not triggered the present invention provides passive signal input interface button S1 or active signal input interface CTR2 is exported
Low level, when metal-oxide-semiconductor Q2 is in cut-off state, input signal is in vacant state.Using timing detection pattern, timing
Tf3, when timing is not timed out, the output of CTR1 pins is low level, and triode Q1 ends, and sampling resistor R3 is in hanging shape
State, no current circuit when break detection circuit does not work, do not generate current drain.When timing Tf3 then, signal wire breaks
Line detection circuit works.It is controllable with the inquiry software approach such as detection method, ADC detection methods and hardware circuit power supply by interrupting
Mode cooperate, realize meet detect work on the premise of, have lower power consumption, when input signal short circuit,
It can avoid generating power consumption, influence product power supply service life by automatically switching the power supply of detection circuit.
Each sequence number in above-described embodiment is for illustration only, does not represent the elder generation during the assembling or use of each component
Order afterwards.
The foregoing is merely the embodiment of the present invention, are not intended to limit the invention, all in the spirit and principles in the present invention
Within, any modifications, equivalent replacements and improvements are made should all be included in the protection scope of the present invention.
Claims (10)
1. the switching signal detection circuit with self-diagnostic function, which is characterized in that the switching signal detection circuit, including：
The resistance R1 and resistance R2 to connect with resistance R1 is equipped with POW_CTR pins in the one end of resistance R1 away from resistance R2,
SW_IO pins and capacitance C1, one end ground connection of the capacitance C1 away from SW_IO pins, resistance R2 are equipped between resistance R1, resistance R2
The other end away from resistance R1 is switching signal input interface.
2. the switching signal detection circuit according to claim 1 with self-diagnostic function, which is characterized in that opened described
Signal wire break detection circuit is connected on the switching signal input interface of OFF signal detection circuit；
Switch detection circuit is connected in the output terminal of the signal wire break detection circuit, in signal wire burn out detection electricity
The output terminal on road is connected with
Passive signal output circuit or
Active signal output circuit or
Passive signal output circuit and active signal output circuit；
Wherein, signal conversion electricity is also associated between the output terminal of signal wire break detection circuit and active signal output circuit
Road.
3. the switching signal detection circuit according to claim 2 with self-diagnostic function, which is characterized in that in the letter
In number line break detection circuit, equipped with triode Q1, the first control for sending control signal is connected in the base stage of triode Q1
End is equipped with resistance R4 between control terminal and base stage, resistance R3, the hair of triode Q1 is connected at the collector of triode Q1
Emitter grounding.
4. the switching signal detection circuit according to claim 1 with self-diagnostic function, which is characterized in that opened described
In OFF signal detection circuit, source signal conversion circuit is additionally provided with, including：
Include source follower circuit, including metal-oxide-semiconductor Q3 and triode Q4, the grid of metal-oxide-semiconductor Q3 and the collector phase of triode Q4
Even, the drain electrode of metal-oxide-semiconductor Q3 is through diode D2 connection signaling conversion circuits；
Resistance R7 is equipped between the collector of triode Q4 and the source electrode of metal-oxide-semiconductor Q3, the base stage of triode Q4 connects through resistance R8
It is connected to the second control terminal.
5. the switching signal detection circuit according to claim 4 with self-diagnostic function, which is characterized in that described active
The active signal conversion circuit for further including and having source follower circuit to connect in signal circuit, including：
The drain electrode connecting valve signal input interface of metal-oxide-semiconductor Q2, metal-oxide-semiconductor Q2, the source electrode ground connection of metal-oxide-semiconductor Q2, the grid of metal-oxide-semiconductor Q2
Resistance R5 is connected with, is grounded in the one end of resistance R5 away from metal-oxide-semiconductor Q2 through resistance R6, the other ends of the resistance R6 away from ground terminal connects
Connect signal output apparatus.
6. the switching signal detection circuit according to any one of claims 1 to 5 with self-diagnostic function, feature exist
In described to be additionally provided with voltage protection between the input interface of switch detection circuit and the output terminal of signal wire break detection circuit
Circuit, the output terminal of voltage protection circuit is as external interface.
7. the switching signal detection circuit according to any one of claims 1 to 6 with self-diagnostic function, feature exist
In further including the switching signal detection method applied to the switching signal detection circuit, the switching signal detection method bag
The step of including internal interface open circuit detection, specially：
SW_IO pins in switch detection circuit are set to output state, POW_CTR pins are set to input state；
SW_IO pins is made first to export high level, rear to export low level or SW_IO pins is made first to export low level, the rear high electricity of output
Flat, the level signal exported by POW_CTR pins to SW_IO pins is detected；
If when SW_IO pins first export high level, export low level afterwards, POW_CTR first detects high level, then detects
Low level illustrates that SW_IO pins, POW_CTR pins are normal；
If when SW_IO pins first export low level, export high level afterwards, POW_CTR first detects low level, then detects
High level illustrates that SW_IO pins, POW_CTR pins are normal；
If level change is not detected, illustrate that internal interface breaks down.
8. the switching signal detection circuit according to any one of claims 1 to 6 with self-diagnostic function, feature exist
In the switching signal detection circuit further includes signal wire wire break detection method, is specially：
Passive signal input interface is not triggered or active signal input interface CTR2 output low levels, metal-oxide-semiconductor Q2 are in cut-off
During state, external interface is in vacant state；
Using timing detection pattern, if timing is Tf3, when timing is not timed out, the output of CTR1 pins is low level, three
Pole pipe Q1 ends, and sampling resistor R3 is in vacant state, and no current circuit when break detection circuit does not work, does not generate electric current
Consumption.
9. the switching signal detection circuit according to claim 8 with self-diagnostic function, which is characterized in that the signal
Line wire break detection method, further includes：
When switch is not triggered, i.e., external interface is in vacant state,
It is input state by POW_CTR pin configuration, SW_IO pins are using multiplexing Chip Microcomputer A/D function, that is, analog to digital conversion
Function；
Sampling resistor accesses/disconnects control line CTR1 output high level, and sampling resistor access signal bus, pull-up resistor R1 is with protecting
Shield resistance R2, voltage protection diode D1, sampling resistor R3 contact and divide, and being connected to GND by triode Q1 forms electric current
Circuit, SW_IO pins carry out AD voltage samples to sampling resistor；
If sampled voltage is less than threshold value Vt, judge that signal wire connection is normal；If sampled voltage is higher than threshold value Vt, can sentence
Break as broken string state；Vt scopes are 0~0.62V preferably, Vt threshold values are obtained according to actual samples voltage；
After the completion of sampling, sampling resistor accesses/disconnects control line CTR1 output low levels, other two pin is restored to switch letter
Number detection working condition.
10. the switching signal detection circuit according to claim 8 with self-diagnostic function, which is characterized in that described to work as
Then, signal wire break detection circuit works timing Tf3, including：
The output of POW_CTR pins is high level, and SW_IO pins are using multiplexing AD functions, that is, analog to digital conversion function, sampling
Resistance accesses/disconnects control line CTR1 output high level, and sampling resistor is accessed signal bus；
Pull-up resistor R1 and protective resistance R2, voltage protection diode D1, sampling resistor R3 contact and divide, and pass through triode
Q1 is connected to GND and forms current loop, and SW_IO pins carry out AD samplings at this time, is carried out according to sampled result combination formula 1,2,3
Judge；
Work as no signal, when external interface is hanging,
V3=V1 × (R2+R3)/(R1+R2+R3)+V2, formula 1；
When there is a signal, when external interface is low level, V3=V1 × R2/ (R1+R2)+V2, formula 2；
When break state when, V3=V1, formula 3；
In above-mentioned ADC sampled voltages calculation formula, if voltage V1 is POW_CTR pin voltages, V2 works for protection diode
Voltage, V3 are SW_IO pin AD sampled voltages.
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| CN201711448135.4A CN108107357A (en) | 2017-12-27 | 2017-12-27 | Switching signal detection circuit with self-diagnostic function |
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