CN103941132B - Anti-interference switching value detection circuit for microprocessor protection device - Google Patents
Anti-interference switching value detection circuit for microprocessor protection device Download PDFInfo
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- CN103941132B CN103941132B CN201410207276.7A CN201410207276A CN103941132B CN 103941132 B CN103941132 B CN 103941132B CN 201410207276 A CN201410207276 A CN 201410207276A CN 103941132 B CN103941132 B CN 103941132B
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Abstract
An anti-interference switching value detection circuit for a microprocessor protection device comprises at least a switching value detection unit, a power supply synchronous enable circuit, a level switching circuit and a filter circuit; the switching value detection unit which detects switching values of switching value nodes and outputs detection signals; the power supply synchronous enable circuit outputs synchronous enable signals of an external alternating current driving power supply; synchronous enable is performed on the synchronous enable signals and the detection signals; the filter circuit is connected with output of the level switching circuit to filter the detection signals which are not synchronous with the synchronous enable signals and send the filtered signals to a microprocessor; the detection signals output from the switching value detection unit are effectively output under the condition that the detection signals are synchronous. The anti-interference switching value detection circuit for the microprocessor protection device has the advantages of improving the switching value anti-interference capability and the switching value confirming accuracy, achieving reduction of false operation of the switching value particularly non electrical quantity protection and improving the reliability of the microprocessor protection device.
Description
Technical field
The present invention relates to a kind of switching quantity detection circuit, specifically a kind of microcomputer protecting device anti-interference switch amount inspection
Slowdown monitoring circuit.
Background technology
Microcomputer relay protector has progressively replaced traditional old-fashioned relay at present, is widely used in power system second protection
System, it is core that microcomputer protecting device adopts Embedded microprocessor, realizes voltage x current analog quantity, and switching value information
Collection, enters data processing, and protection judges, and by the relay outlet loop in device, drives the divide-shut brake coil of chopper,
Realize a circuit failure removal protection；The essence of therefore microcomputer protecting device is one and has voltage x current information gathering, opens
Pass amount monitoring, the embedded computer of the function such as data processing protection control.
For microcomputer protecting device, the detection of switching value is very important, and switching value refers to microprocessor
Obtain the division state of primary equipment in the switch cubicle of microcomputer protecting device place by testing circuit, and high temperature gas is isallobaric
The feature of the abnormality of device motor apparatus, therefore switching value is two value informations, that is, open or close, zero or one, and finally change
Become the low and high level input quantity that microprocessor i.o pin can read.
Switching quantity detection circuit is connected with the switch synchronization node of primary equipment, and this node division state is reflected into micro- place
The level signal that reason device can identify, is the process to light current information pick-up for the forceful electric power information.Therefore switching value typically adopts optocoupler
Realize switching information conversion, and realize isolating.Typical primary side switching quantity detection circuit is by switching value driving power supply, switching value
Node, current-limiting resistance, optocoupler emitting diode input are constituted.Through photoelectric conversion, optocoupler receiving terminal pass through pull-up resistor or
Pull down resistor is converted into the discernible level signal of microprocessor.
Prior art has the circuit of some detection switch amounts, such as Chinese patent literature cn203056577u, entitled " general
Type switch quantity acquisition circuit " in disclose a kind of universal switch quantity acquisition circuit, between positive polarity and voltage negative pole according to
Secondary be in series with external switch amount k, resistance r1 and photoelectrical coupler, the two ends of described photoelectrical coupler have been arranged in parallel resistance r2,
The light sensitive diode through photoelectrical coupler for the input power is connected with microprocessor mcu, and described photoelectrical coupler is bipolarity photoelectricity
Bonder, is provided with filter circuit between described bipolarity photoelectrical coupler and microprocessor mcu.Solve in prior art
Auxiliary reclay gather switching value real-time poor, return value is big and coil is fragile, common optoelectronic coupler collection electricity
Louis damage, Key dithering ability, be not suitable for alternating current power supply and collection apart from the technical problem such as short, there is provided a kind of Key dithering
Ability is strong, AC/DC universal and collection are apart from remote universal switch quantity acquisition circuit.
Switching quantity detection circuit in this patent, when in actual applications, during using external communication driving power supply, exist as
Lower problem:
1) do, using exchange 220v/110v power supply, the problem that the driving power supply of switching value is brought.Due to common optical coupler
Be one-way only operation i.e. only have overcurrent flow to negative pole from optocoupler diode cathode, could work.Therefore existed using common optical coupler
Under alternating-current switch amount driving power supply, the positive half cycle that only alternating current power supply is powered has the ability of switching value it is impossible to realize handing over
Switching value in the stream time in power supply complete period, exists the blind area of switching value, switching value therefore the time
Not in time or missing inspection situation.
2) distance switch amount test problems: there are some in distribution system and directly act on signal outlet and opening of tripping
Guan Liang, the such as node of the non-electrical sensor such as the temperature of primary power distribution transformer equipment, gas output.These Node distribution are becoming
In depressor body, distant with power distribution cabinet (up to hundreds of rice), and electromagnetic environment is severe, is easily disturbed.These nodes simultaneously
Once closure, it is necessary to start the non-ionizing energy loss element in Microcomputer Protection, is realized tripping operation, therefore it is required that reliability is high, is otherwise drawn
Play malfunction.In actual applications, using long wire, remote switching value is attached.Because wire has distribution capacity,
AC driven power (exchange 220v, 50hz) voltage passes through distribution capacity inductive coupling to switching value input, and generation can
Reach tens volts of induced voltages to upper hectovolt, drive photoelectric coupled circuit, cause switching value to judge by accident, cause malfunction.
Content of the invention
For this reason, the invention solves the problems that the switching value in the time in power supply complete period cannot be realized in prior art, and
To when judging non-ionizing energy loss switching value, there is the situation occurring judging by accident because of interference voltage, thus propose one kind growing
Suppress the switching quantity detection circuit of interference voltage in line switching amount measure loop.
For solving above-mentioned technical problem, the present invention employs the following technical solutions realization:
A kind of microcomputer protecting device anti-interference switch amount testing circuit, including at least one switching value unit, and outer
Portion's power supply and switching value node connect, the switching value of detection switch amount node, and output switch amount detection signal；
Also include line lock and enable circuit, it is parallel on described external power source with described switching value unit, its
Output external power source synchronous enabled signal, described switching value signal is synchronized, by with its with frequency homophase detection
Signal enables output, by nonsynchronous signal shielding；
Level shifting circuit, enables the defeated of circuit with the output of described switching value unit and described line lock respectively
Go out to connect, the signal that both are exported is converted to low and high level signal；
Filter circuit, the output with described level shifting circuit is connected, and filtering in described detection signal is synchronously made with described
The energy nonsynchronous detection signal of signal, the signal after filtration is sent to microprocessor.
Preferably, in parallel being connected with external power source, each described switching value between multiple described switching value units
Detector unit is connected with corresponding described level shifting circuit and described filter circuit.
Preferably, described filter circuit is low-pass filter circuit.
Preferably, also include driving intensifier circuit, it enables circuit and described switching value list with described line lock
Unit connects.
Preferably, described switching value unit includes photoelectrical coupler un, wherein n >=1, described photoelectrical coupler un with
Resistance rn1 and external switch amount kn are sequentially connected in series between the zero line and live wire of power supply, and described photoelectrical coupler un sends out
Optical diode two ends are also parallel with resistance rn2.
Preferably, described line lock enable circuit includes photoelectrical coupler u0, described photoelectrical coupler u0 and resistance r01
It is sequentially connected in series between the zero line and live wire of power supply, the two ends of the light emitting diode of described photoelectrical coupler u0 are also parallel with
Resistance r02, described line lock enables circuit and described in parallel being connected on power supply of switching value unit.
Preferably, described photoelectrical coupler is two-way photoelectric coupling.
Preferably, described low-pass filter circuit includes resistance rln, wherein n >=1, and one end of described resistance rln is described low
The input of bandpass filter circuit, the other end is connected with microprocessor, between described resistance rl1 and microprocessor junction point also with
One end of electric capacity cln connects, the other end ground connection of described electric capacity cln.
Preferably, described level shifting circuit includes resistance rn3, and described resistance rn3 one end is connected with external power supply vcc,
The other end is connected with the colelctor electrode of phototriode in described photoelectrical coupler un, phototriode in described photoelectrical coupler un
Colelctor electrode be also connected with the input of described low-pass filter circuit, the emitter stage of the phototriode of described photoelectrical coupler un
It is connected with the colelctor electrode of described photoelectrical coupler u0, the grounded emitter of described photoelectrical coupler u0.
Preferably, described driving intensifier circuit includes resistance r03 and audion q1, and the base stage of described audion q1 passes through electricity
Resistance r03 is connected with the emitter stage of the phototriode of described photoelectrical coupler u0, and the grounded emitter of described audion q1 is described
The colelctor electrode of audion q1 is connected with the emitter stage of the phototriode of described photoelectrical coupler un, the light of described electric coupler u0
The colelctor electrode external power supply vcc of quick audion.
Preferably, described level shifting circuit also includes resistance rn3, described resistance rn3 one end and described photoelectrical coupler
In un, the emitter stage of phototriode connects, and the other end is grounded, and in described photoelectrical coupler un, the emitter stage of phototriode is also
It is connected with the input of described low-pass filter circuit, the colelctor electrode of phototriode of described photoelectrical coupler un and described photoelectricity
In bonder u0, the emitter stage of phototriode connects, and the colelctor electrode of described photoelectrical coupler u0 meets power supply vcc.
Preferably, described driving intensifier circuit includes resistance r03 and audion q1, and the base stage of described audion q1 passes through electricity
Resistance r03 is connected with the colelctor electrode of the phototriode of described photoelectrical coupler u0, the phototriode of described photoelectrical coupler u0
Grounded emitter, the emitter stage external power supply vcc of described audion q1.
The technique scheme of the present invention has advantages below compared to existing technology,
(1) microcomputer protecting device anti-interference switch amount testing circuit of the present invention, including the inspection of at least one switching value
Survey unit, be connected with external power source and switching value node, the switching value of detection switch amount node, and export detection signal；Also wrap
Include line lock and enable circuit, it is parallel on described external power source with described switching value unit, it exports external power source
Synchronous enabled signal, described synchronous enabled signal and described detection signal synchronize；Level shifting circuit, respectively with described
The output of the output of switching value unit and described line lock enable circuit connects, and the signal that both are exported is converted to height
Low level signal；Filter circuit, the output with described level shifting circuit is connected, with described synchronization in the described detection signal of filtration
Enable the nonsynchronous detection signal of signal, the signal after filtration is sent to microprocessor；Realize other each way switch amount detection letters
Number synchronous enabled output.Under synchronous enabled signal function, the detection signal of each switching value unit output only with
Effectively export in the case of AC driven power synchronization.And in alternating current power supply asynchronous due to sense (capacitive sensing or inductance sense
Should) or other disturbed conditions under the switch output that produces, due to capacitive character or electric induction induced voltage, generally with exchange driving electric
Source is asynchronous, there is phase contrast, and therefore under synchronous enabled circuit function, be not enabled output.By synchronous enabled, can be with area
Do not go out the output of normal switch amount, or the switch misoperation that other interference or induced voltage cause.Improve the anti-interference energy of switching value
Power and the accuracy of switching value confirmation, reach the misoperation reducing switching value especially non-ionizing energy loss, improve Microcomputer Protection dress
The reliability put.
(2), in microcomputer protecting device anti-interference switch amount testing circuit of the present invention, described level shifting circuit is also
Including driving intensifier circuit, enable driving force can be lifted.
(3) in microcomputer protecting device anti-interference switch amount testing circuit of the present invention, the photoelectricity that this programme is used
Bonder, preferably bidirectional optocoupler so that alternating current power supply drive under, positive-negative half-cycle, can realize switching value under all-wave state
Monitoring.Also circuit requirement can be met using unidirectional optocoupler, but will in the input of unidirectional optocoupler and connect one with optocoupler light
Diode protection diode in opposite direction, as shown in drawings.Using unidirectional optocoupler, can only realize under exchange driving, positive half cycle
Switching value monitoring in time.
Brief description
In order that present disclosure is more likely to be clearly understood, specific embodiment below according to the present invention simultaneously combines
Accompanying drawing, the present invention is further detailed explanation, wherein
Fig. 1 is the structured flowchart of one embodiment of the invention；
Fig. 2 Fig. 5 is the circuit structure diagram of another embodiment of the present invention；
Fig. 6, Fig. 7, Fig. 8 are the circuit structure diagrams of additional embodiment of the present invention.
Specific embodiment
The specific embodiment of of the present invention microcomputer protecting device anti-interference switch amount testing circuit is provided below.
Embodiment 1
Microcomputer protecting device anti-interference switch amount testing circuit of the present invention, as shown in figure 1, include at least one open
Close amount detection unit, be connected with external power source and switching value node, the switching value of detection switch amount node, and export detection letter
Number, because needing during detection switch amount in practical application to detect multigroup switching value, specifically described switching value unit setting
Number is configured according to actual needs, and described external power source is alternating current power supply in the present embodiment.
Additionally, also including line lock to enable circuit, it is parallel to described external communication with described switching value unit
On power supply, the synchronous enabled signal of its output external ac power source, described synchronous enabled signal can be carried out with described detection signal
Synchronous, can be synchronous with the signal of frequency homophase with described synchronous enabled signal in described detection signal, others can not be with it
Synchronous.
Secondly, it is additionally provided with level shifting circuit, same with the output of described switching value unit and described power supply respectively
The output that step enables circuit connects, and the signal that both are exported is converted to low and high level signal, is specifically converted to high level signal
Or low level signal is set according to actual needs；Also set up filter circuit, the output with described level shifting circuit is connected, mistake
Filter the detection signal of i.e. different frequency homophases asynchronous from described synchronous enabled signal in described detection signal, the signal after filtration is sent out
Give microprocessor, status monitoring is carried out by microprocessor；Realize the synchronous enabled output of other each way switch amount detection signals.
In the present embodiment, in parallel being connected with external power source between multiple described switching value units, and each institute
State switching value unit and be connected with corresponding described level shifting circuit and described filter circuit.
Under synchronous enabled signal function, the detection signal of each switching value unit output is only driving electricity with exchanging
Effectively export in the case of the synchronization of source.And in alternating current power supply asynchronous due to sensing (capacitive sensing or inductance sensing) or other are dry
The switch output producing in the case of disturbing, due to capacitive character or electric induction induced voltage, generally asynchronous with AC driven power, deposit
In phase contrast, therefore under synchronous enabled circuit function, be not enabled output.By synchronous enabled, it is possible to distinguish go out just normally opened
Pass amount output, or the switch misoperation that other interference or induced voltage cause.Improve switching value capacity of resisting disturbance and switching value
The accuracy confirming, reaches the misoperation reducing switching value especially non-ionizing energy loss, improves the reliability of microcomputer protecting device.
Embodiment 2
On the basis of microcomputer protecting device anti-interference switch amount testing circuit described in embodiment 1, such as Fig. 2, Fig. 3, figure
4th, shown in Fig. 5, in the present embodiment, line lock enables circuit, including the synchronizing signal with the same frequency homophase of AC driven power
The line lock producing detects the synchronous enabled circuit of photoelectric coupled circuit and output switch parameter, sees Fig. 2.Wherein, AC driven power
Circuit for generating synchronous signals, that is, this circuit obtain and output AC driving power supply synchronizing signal, be line lock therein
Detection photoelectric coupled circuit；Block Diagrams as Fig. 3 are partly shown, and the waveform of the position output wherein irised out is as shown in the figure；Switching value is defeated
The synchronous enabled circuit going out, synchronizes enable with the synchronizing signal of alternating current power supply to switch monitors output, logically realizes
Logical "and" function, as partly shown in Fig. 4 Block Diagrams.
Described switching value unit includes photoelectrical coupler un, because described switching value unit is at least provided with one,
So wherein n >=1, in following symbol, n is corresponding with the n in un, described photoelectrical coupler un and resistance rn1 and external switch amount kn
It is sequentially connected in series between the zero line n and live wire l of power supply, the light emitting diode two ends of described photoelectrical coupler un are also parallel with
Resistance rn2, resistance rn2 are connected in parallel on optocoupler two input, constitute resistance pressure-dividing network so that optocoupler input exists with resistance rn1
There is certain startup voltage and could start optocoupler, this startup voltage can not arrange excessive, otherwise can lower switching value spirit
Sensitivity, described light emitting diode as using unidirectional optocoupler, then uses with to use diode dn reversely defeated with optocoupler light emitting diode
Enter parallel connection so as to play the effect of protection optocoupler input when alternating voltage is reverse.Can also be using two-way optocoupler so that opening
Close amount detection unit, in the positive and negative semiaxis of AC driven power, all there is switching value loop, during using two-way optocoupler, two poles
Pipe dn can omit.
Described line lock enables circuit and includes photoelectrical coupler u0, and described photoelectrical coupler u0 and resistance r01 goes here and there successively
Connection is connected between the zero line of power supply and live wire, and the two ends of the light emitting diode of described photoelectrical coupler u0 are also parallel with resistance
As using unidirectional optocoupler, then it inputs both sides and need to be parallel with diode d0 the light emitting diode of r02, described photoelectrical coupler u0,
As during using two-way optocoupler, then diode d0 can omit, and described line lock enables circuit and described switching value unit
In parallel is connected on power supply it is possible to output AC power source is with frequency, the synchronous enabled signal of homophase.
Described filter circuit is low-pass filter circuit in the present embodiment, and described low-pass filter circuit includes resistance rln, its
Middle n >=1, one end of described resistance rln is the input of described low-pass filter circuit, and the other end is connected with microprocessor, in institute
State and be also connected with one end of electric capacity cln between resistance rl1 and microprocessor junction point, the other end ground connection of described electric capacity cln.
Described level shifting circuit includes resistance rn3, and described resistance rn3 one end is connected with external power supply vcc, the other end with
In described photoelectrical coupler un, the colelctor electrode of phototriode connects, the colelctor electrode of phototriode in described photoelectrical coupler un
Also it is connected with the input of described low-pass filter circuit, the emitter stage of phototriode of described photoelectrical coupler un and described light
The colelctor electrode of electric coupler u0 connects, the grounded emitter of described photoelectrical coupler u0.
The optocoupler output of switching value unit described in the present embodiment, using the way of output of Low level effective, works as friendship
When the synchronous enabled signal of stream power supply is effective, line lock enables the photoelectrical coupler output conducting ground connection of circuit, if now
Switching value unit detects switching value closure, the output conducting of its photoelectrical coupler, and enables circuit by line lock
Optocoupler output ground connection, forms low level, more low-pass filtered circuit accesses microprocessor and carries out status monitoring, and invalid enabling
In the case of, the output of switching value unit is shielded, and exports high level all the time.
Therefore under the synchronization of synchronous enabled signal, only in the case of switching value node normally closed, alternating current
Source is conducting to switching value unit, and the detection signal of its optocoupler output is the synchronization enabling circuit output with described line lock
It is synchronous for enabling signal, therefore can form level signal and send into microprocessor under synchronous enabled effect.
Embodiment 3
On the basis of microcomputer protecting device anti-interference switch amount testing circuit described in embodiment 2, as shown in fig. 6, also
It is provided with driving intensifier circuit, described driving intensifier circuit enables circuit and described switching value unit with described line lock
Optocoupler output connect, described driving intensifier circuit includes resistance r03 and audion q1, described resistance rn3 one end with external
Power supply vcc connects, and the other end is connected with the colelctor electrode of phototriode in described photoelectrical coupler un, described photoelectrical coupler un
The colelctor electrode of middle phototriode is also connected with the input of described low-pass filter circuit, and the base stage of described audion q1 passes through electricity
Resistance r03 is connected with the emitter stage of the phototriode of described photoelectrical coupler u0, and the grounded emitter of described audion q1 is described
The colelctor electrode of audion q1 is connected with the emitter stage of the phototriode of described photoelectrical coupler un, the light of described electric coupler u0
The colelctor electrode external power supply vcc of quick audion, described driving intensifier circuit can strengthen described line lock and enable circuit output
Synchronous enabled signal.
Embodiment 4
On the basis of microcomputer protecting device anti-interference switch amount testing circuit described in embodiment 1, as shown in fig. 7, institute
State switching value unit and include photoelectrical coupler un, because described switching value unit is at least provided with one, so wherein n >=
1, in following symbol, n is corresponding with the n in un, and described photoelectrical coupler un and resistance rn1 and external switch amount kn are sequentially connected in series even
It is connected between the zero line n of power supply and live wire l, the light emitting diode two ends of described photoelectrical coupler un are also parallel with resistance rn2, electricity
Resistance rn2 be connected in parallel on optocoupler two input, with resistance rn1 constitute resistance pressure-dividing network so that optocoupler input have certain
Start voltage and could start optocoupler, this startup voltage can not arrange excessive, otherwise can lower switching value sensitivity, described
Optical diode as using unidirectional optocoupler, then use with use diode dn reversely input with optocoupler light emitting diode in parallel so as to
Play the effect of protection optocoupler input when alternating voltage is reverse.Can also be using two-way optocoupler so that switching value list
Unit all has switching value loop in the positive and negative semiaxis of AC driven power, and during using two-way optocoupler, diode dn can save
Slightly..
Described line lock enables circuit and includes photoelectrical coupler u0, and described photoelectrical coupler u0 and resistance r01 goes here and there successively
Connection is connected between the zero line of power supply and live wire, and the two ends of the light emitting diode of described photoelectrical coupler u0 are also parallel with resistance
R02, described line lock enables be connected on power supply on it is possible to output AC electric in parallel with described switching value unit of circuit
Source is with frequency, the synchronous enabled signal of homophase.
Described filter circuit is low-pass filter circuit in the present embodiment, and described low-pass filter circuit includes resistance rln, its
Middle n >=1, one end of described resistance rln is the input of described low-pass filter circuit, and the other end is connected with microprocessor, in institute
State and be also connected with one end of electric capacity cln between resistance rl1 and microprocessor junction point, the other end ground connection of described electric capacity cln.
Described level shifting circuit also includes resistance rn3, and described resistance rn3 one end is photosensitive with described photoelectrical coupler un
The emitter stage of audion connects, and the other end is grounded, and in described photoelectrical coupler un, the emitter stage of phototriode is also low with described
Input connection, the colelctor electrode of phototriode of described photoelectrical coupler un and the described photoelectrical coupler u0 of bandpass filter circuit
The emitter stage of middle phototriode connects, and the colelctor electrode of described photoelectrical coupler u0 meets power supply vcc.
The output that switching value unit and line lock enable circuit is pressed high level effective means wiring by the present embodiment,
I.e. synchronous enabled effectively in the case of, the output conducting of photoelectrical coupler u0, vcc is loaded into the optocoupler of each switching value unit
Outfan, now switching value output be enabled, if switching value input block detects the switching value section of closed loop
Point, the optocoupler output conducting of this switching value unit, vcc drives the on-off state output producing high level, through low pass filtered
Ripple device, sends into microprocessor.In the case that switching value enable is invalid, switching value unit remains low level output.
Embodiment 5
On the basis of microcomputer protecting device anti-interference switch amount testing circuit described in embodiment 4, as shown in figure 8, also
It is provided with driving intensifier circuit, described driving intensifier circuit enables circuit and described switching value unit with described line lock
Optocoupler output connect, described driving intensifier circuit includes resistance r03 and audion q1, described resistance rn3 one end with described
In photoelectrical coupler un, the emitter stage of phototriode connects, and the other end is grounded, phototriode in described photoelectrical coupler un
Emitter stage be also connected with the input of described low-pass filter circuit, the colelctor electrode of phototriode in described photoelectrical coupler un
It is connected with the colelctor electrode of described audion q1, the base stage of described audion q1 passes through resistance r03 and described photoelectrical coupler u0's
The colelctor electrode of phototriode connects, the grounded emitter of the phototriode of described photoelectrical coupler u0, described audion q1
Emitter stage external power supply vcc, described driving intensifier circuit can lift driving force.
Obviously, above-described embodiment is only intended to clearly illustrate example, and the not restriction to embodiment.Right
For those of ordinary skill in the art, can also make on the basis of the above description other multi-forms change or
Change.There is no need to be exhaustive to all of embodiment.And the obvious change thus extended out or
Change among still in the protection domain of the invention.
Claims (12)
1. a kind of microcomputer protecting device anti-interference switch amount testing circuit, including at least one switching value unit, with outside
Power supply and switching value node connect, the switching value of detection switch amount node, and output switch amount detection signal；
It is characterized in that, also include line lock and enable circuit, it is parallel to described external electrical with described switching value unit
On source, the synchronous enabled signal of its output external power source, described switching value signal is synchronized, will be with it with frequency homophase
Detection signal enable output, by nonsynchronous signal shielding；
Level shifting circuit, the output enabling circuit with output and the described line lock of described switching value unit respectively is even
Connect, the signal that both are exported is converted to low and high level signal；
Filter circuit, the output with described level shifting circuit is connected, with described synchronous enabled letter in the described detection signal of filtration
Number nonsynchronous detection signal, the signal after filtration is sent to microprocessor.
2. switching quantity detection circuit according to claim 1 is it is characterised in that described switching value unit includes photoelectricity
Bonder un, wherein n >=1, described photoelectrical coupler un and resistance rn1 and external switch amount kn are sequentially connected in series in power supply
Between zero line and live wire, the light emitting diode two ends of described photoelectrical coupler un are also parallel with resistance rn2.
3. switching quantity detection circuit according to claim 2 is it is characterised in that between multiple described switching value unit
It is connected with external power source in parallel, each described switching value unit is connected with corresponding described level shifting circuit and described
Filter circuit.
4. switching quantity detection circuit according to claim 2 is it is characterised in that described filter circuit is low-pass filtering electricity
Road.
5. switching quantity detection circuit according to claim 4 is it is characterised in that described low-pass filter circuit includes resistance
Rln, wherein n >=1, one end of described resistance rln is the input of described low-pass filter circuit, and the other end is with microprocessor even
Connect, be also connected with one end of electric capacity cln between described resistance rln and microprocessor junction point, the other end of described electric capacity cln
Ground connection.
6. switching quantity detection circuit according to claim 4 includes light it is characterised in that described line lock enables circuit
Electric coupler u0, described photoelectrical coupler u0 and resistance r01 are sequentially connected in series between the zero line and live wire of power supply, described light
The two ends of the light emitting diode of electric coupler u0 are also parallel with resistance r02.
7. switching quantity detection circuit according to claim 6 is it is characterised in that described photoelectrical coupler u0 or described photoelectricity
Bonder un is two-way photoelectric coupling.
8. switching quantity detection circuit according to claim 7 is it is characterised in that described level shifting circuit includes resistance
Rn3, described resistance rn3 one end is connected with external power supply vcc, the collection of phototriode in the other end and described photoelectrical coupler un
Electrode connects, and in described photoelectrical coupler un, the colelctor electrode of phototriode is also connected with the input of described low-pass filter circuit
Connect, the emitter stage of phototriode of described photoelectrical coupler un is connected with the colelctor electrode of described photoelectrical coupler u0, described light
The grounded emitter of electric coupler u0.
9. switching quantity detection circuit according to claim 7 is it is characterised in that described level shifting circuit also includes resistance
Rn3, described resistance rn3 one end is connected with the emitter stage of phototriode in described photoelectrical coupler un, and the other end is grounded, described
In photoelectrical coupler un, the emitter stage of phototriode is also connected with the input of described low-pass filter circuit, described photoelectric coupling
The colelctor electrode of the phototriode of device un is connected with the emitter stage of phototriode in described photoelectrical coupler u0, described smooth thermocouple
The colelctor electrode of clutch u0 meets power supply vcc.
10. switching quantity detection circuit according to claim 9 is it is characterised in that also include driving intensifier circuit, itself and institute
State line lock and enable circuit and the connection of described switching value unit.
11. switching quantity detection circuits according to claim 10 are it is characterised in that described driving intensifier circuit includes resistance
The base stage of r03 and audion q1, described audion q1 passes through sending out of the phototriode of resistance r03 and described photoelectrical coupler u0
Emitter-base bandgap grading connects, the grounded emitter of described audion q1, the light of the colelctor electrode of described audion q1 and described photoelectrical coupler un
The emitter stage of quick audion connects, the colelctor electrode external power supply vcc of the phototriode of described photoelectrical coupler u0.
12. switching quantity detection circuits according to claim 10 are it is characterised in that described driving intensifier circuit includes resistance
The base stage of r03 and audion q1, described audion q1 passes through the collection of the phototriode of resistance r03 and described photoelectrical coupler u0
Electrode connects, the grounded emitter of the phototriode of described photoelectrical coupler u0, the external electricity of emitter stage of described audion q1
Source vcc, the colelctor electrode of described audion q1 is connected with the colelctor electrode of the phototriode of described photoelectrical coupler un.
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| CN104483579A (en) * | 2014-12-26 | 2015-04-01 | 江苏斯菲尔电气股份有限公司 | Switching value acquisition circuit |
| CN105203146A (en) * | 2015-09-23 | 2015-12-30 | 浪潮集团有限公司 | Sensor interconnection device and sensor detection system and method |
| CN105404199A (en) * | 2015-11-12 | 2016-03-16 | 中国南方电网有限责任公司 | Self-detection circuit for implementing digital input circuit based on pulse injection method |
| CN106990352A (en) * | 2017-03-06 | 2017-07-28 | 新华三技术有限公司 | Closing detecting apparatus and communication equipment |
| CN112510665A (en) * | 2020-09-23 | 2021-03-16 | 科大智能电气技术有限公司 | Switching value EMS protection circuit |
| CN115102387B (en) * | 2022-08-24 | 2023-01-17 | 南京国电南自维美德自动化有限公司 | AC/DC input opening loop |
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