CN103941132A - 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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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 testing circuit.
Background technology
Microcomputer relay protector progressively replaces traditional old-fashioned relay at present, be widely used in electric system secondary protection system, it is core that microcomputer protecting device adopts Embedded microprocessor, realize electric current and voltage analog quantity, and the collection of switching value information, enter data processing, protection judgement, and by the relay outlet loop in device, drive the divide-shut brake coil of isolating switch, realize a circuit failure removal protection; Therefore the essence of microcomputer protecting device is one and has electric current and voltage information acquisition, switching value monitoring, the embedded computer of the functions such as data processing protection control.
For microcomputer protecting device; the detection of switching value is very important; switching value refers to that microprocessor obtains deciliter state of primary equipment in the switch cubicle of microcomputer protecting device place by testing circuit; and the abnormality of the isallobaric device motor apparatus of high temperature gas; therefore the feature of switching value is two value informations; open or close, zero or one, and finally convert the low and high level input quantity that microprocessor I.O pin can read to.
Switching quantity detection circuit is connected with the switch synchronization node of primary equipment, and this node deciliter state is reflected into the level signal that microprocessor can be identified, and is that forceful electric power information becomes the process of sending to light current information.Therefore switching value generally adopts optocoupler to realize switching information conversion, and realizes isolation.Typical primary side switching quantity detection circuit is made up of switching value driving power, switching value node, current-limiting resistance, optocoupler emitting diode input end.Through photoelectric conversion, optocoupler receiving end converts the discernible level signal of microprocessor to by pull-up resistor or pull down resistor.
Prior art has the circuit of some detector switch amounts, as Chinese patent literature CN203056577U, name is called has announced a kind of universal switch quantity acquisition circuit in " universal switch quantity acquisition circuit ", between positive polarity and voltage negative pole, be in series with successively external switch amount K, resistance R 1 and photoelectrical coupler, the two ends of described photoelectrical coupler have been arranged in parallel resistance R 2, input power is connected with Micro-processor MCV through the photodiode of photoelectrical coupler, described photoelectrical coupler is bipolarity photoelectrical coupler, between described bipolarity photoelectrical coupler and Micro-processor MCV, be provided with filtering circuit.Solve auxiliary reclay of the prior art and gathered that the real-time of switching value is poor, rreturn value is large and coil is fragile, common optoelectronic coupler Acquisition Circuit is fragile, debounce kinetic force is poor, be not suitable for AC power and gather the distance technical matters such as short, provides that a kind of debounce kinetic force is strong, AC/DC universal and gather the universal switch quantity acquisition circuit of distance.
Switching quantity detection circuit in this patent, when in actual applications, while using external communication driving power, there are the following problems:
1) problem that the driving power that uses alternating current 220V/110V power supply to do switching value brings.The excess current of only having that is one-way only operation due to common optical coupler flows to negative pole from optocoupler diode cathode, could work.Therefore use common optical coupler under alternating-current switch amount driving power, only have the positive half cycle of ac power supply to there is the ability of switching value, cannot realize the switching value in the time in AC power complete period, on time, there is the blind area of switching value, therefore occur switching value not in time or undetected situation.
2) distance switch amount test problems: the switching value that exists some to directly act on signal outlet and tripping operation in distribution system, as the node of the non-electrical sensor such as temperature, the gas output of primary power distribution transformer equipment.These nodes are distributed in transformer body, and with power distribution cabinet distant (can reach hundreds of rice), and electromagnetic environment is severe, is easily disturbed.Once these nodes are closed, will start the non electrical quantity protecting component in Microcomputer Protection simultaneously, realize tripping operation, therefore require reliability high, otherwise cause malfunction.In actual applications, use long lead to connect remote switching value.Because wire exists distributed capacitance, AC driven power (alternating current 220V, 50Hz) voltage passes through distributed capacitance inductive coupling to switching value input end, generation can reach tens volts of induced voltages to upper hectovolt, drive photoelectric coupled circuit, cause switching value erroneous judgement, cause malfunction.
Summary of the invention
For this reason; the present invention will solve in prior art cannot realize the switching value in the time in power supply complete period; and in the time judging non electrical quantity protection switch amount; there is the situation that occurs erroneous judgement because of interference voltage, thereby propose a kind of switching quantity detection circuit that suppresses interference voltage in long transmission line switching value loop.
For solving the problems of the technologies described above, realization by the following technical solutions of the present invention:
A kind of microcomputer protecting device anti-interference switch amount testing circuit, comprises at least one switching value unit, is connected the switching value of detector switch amount node, and output switch amount detection signal with external power source and switching value node;
Also comprise the synchronous enabled circuit of power supply, itself and described switching value unit are parallel on described external power source, and the synchronous enabled signal of its output external power source, carries out synchronously described switching value signal, by enabling output with its detection signal with frequency homophase, by nonsynchronous signal shielding;
Level shifting circuit, is connected with the output of described switching value unit and the output of the synchronous enabled circuit of described power supply respectively, and both signals of output are converted to low and high level signal;
Filtering circuit, is connected with the output of described level shifting circuit, filters in described detection signal and the nonsynchronous detection signal of described synchronous enabled signal, and the signal after filtration sends to microprocessor.
Preferably, in parallel being connected with external power source between multiple described switching values unit, each described switching value unit is connected with corresponding described level shifting circuit and described filtering circuit.
Preferably, described filtering circuit is low-pass filter circuit.
Preferably, also comprise driving intensifier circuit, it is connected with the synchronous enabled circuit of described power supply and described switching value unit.
Preferably, described switching value unit comprises photoelectrical coupler Un, wherein n >=1, described photoelectrical coupler Un and resistance R n1 and external switch amount Kn are connected in series between the zero line and live wire of power supply successively, and the light emitting diode two ends of described photoelectrical coupler Un are also parallel with resistance R n2.
Preferably, the synchronous enabled circuit of described power supply comprises photoelectrical coupler U0, described photoelectrical coupler U0 and resistance R 01 are connected in series between the zero line and live wire of power supply successively, the two ends of the light emitting diode of described photoelectrical coupler U0 are also parallel with resistance R 02, the synchronous enabled circuit of described power supply and in parallel being connected on power supply in described switching value unit.
Preferably, described photoelectrical coupler is bi-directional light electric coupling.
Preferably, described low-pass filter circuit comprises resistance R Ln, wherein n >=1, one end of described resistance R Ln is the input end of described low-pass filter circuit, the other end is connected with microprocessor, between described resistance R L1 and microprocessor tie point, be also connected the other end ground connection of described capacitor C Ln with one end of capacitor C Ln.
Preferably, described level shifting circuit comprises resistance R n3, described resistance R n3 one end is connected with external power supply Vcc, the other end is connected with the collector of phototriode in described photoelectrical coupler Un, in described photoelectrical coupler Un, the collector of phototriode is also connected with the input end of described low-pass filter circuit, the emitter of the phototriode of described photoelectrical coupler Un is connected with the collector of described photoelectrical coupler U0, the grounded emitter of described photoelectrical coupler U0.
Preferably, described driving intensifier circuit comprises resistance R 03 and triode Q1, the base stage of described triode Q1 is connected with the emitter of the phototriode of described photoelectrical coupler U0 by resistance R 03, the grounded emitter of described triode Q1, the collector of described triode Q1 is connected with the emitter of the phototriode of described photoelectrical coupler Un, the collector external power supply Vcc of the phototriode of described electric coupler U0.
Preferably, described level shifting circuit also comprises resistance R n3, described resistance R n3 one end is connected with the emitter of phototriode in described photoelectrical coupler Un, other end ground connection, in described photoelectrical coupler Un, the emitter of phototriode is also connected with the input end of described low-pass filter circuit, the collector of the phototriode of described photoelectrical coupler Un is connected with the emitter of phototriode in described photoelectrical coupler U0, and the collector of described photoelectrical coupler U0 connects power Vcc.
Preferably, described driving intensifier circuit comprises resistance R 03 and triode Q1, the base stage of described triode Q1 is connected with the collector of the phototriode of described photoelectrical coupler U0 by resistance R 03, the grounded emitter of the phototriode of described photoelectrical coupler U0, the emitter external power supply Vcc of described triode Q1.
Technique scheme of the present invention has the following advantages compared to existing technology,
(1) microcomputer protecting device anti-interference switch amount testing circuit of the present invention, comprises at least one switching value unit, is connected the switching value of detector switch amount node, and output detection signal with external power source and switching value node; Also comprise the synchronous enabled circuit of power supply, itself and described switching value unit are parallel on described external power source, the synchronous enabled signal of its output external power source, and described synchronous enabled signal is synchronizeed with described detection signal; Level shifting circuit, is connected with the output of described switching value unit and the output of the synchronous enabled circuit of described power supply respectively, and both signals of output are converted to low and high level signal; Filtering circuit, is connected with the output of described level shifting circuit, filters in described detection signal and the nonsynchronous detection signal of described synchronous enabled signal, and the signal after filtration sends to microprocessor; Realize the synchronous enabled output of other each way switch amount detection signals.Under synchronous enabled signal function, the only effectively output in the situation that synchronizeing with AC driven power of the detection signal of each switching value unit output.And it is asynchronous owing to responding to the switch output producing under (capacitive sensing or inductance induction) or other disturbed conditions in AC power, due to capacitive character or electro-induction induced voltage, conventionally asynchronous with AC driven power, there is phase differential, therefore under synchronous enabled circuit function, output is not enabled.By synchronous enabled, can distinguish normal switch amount output, or the switch misoperation that causes of other interference or induced voltage.Improve the accuracy that switching value antijamming capability and switching value are confirmed, reach and reduce the especially misoperation of non electrical quantity protection of switching value, improve the reliability of microcomputer protecting device.
(2) in microcomputer protecting device anti-interference switch amount testing circuit of the present invention, described level shifting circuit also comprises driving intensifier circuit, can promote and enable driving force.
(3) in microcomputer protecting device anti-interference switch amount testing circuit of the present invention, the photoelectrical coupler that this programme uses, preferred two-way optocoupler, makes under AC power drives, and positive-negative half-cycle, can realize the monitoring of switching value under all-wave state.Use unidirectional optocoupler also can meet circuit requirement, but will the input end of unidirectional optocoupler and connect one with the protection diode of optocoupler light emitting diode opposite direction, as shown in drawings.Use unidirectional optocoupler, can only realize and exchanging under driving, the just monitoring of the switching value in half time-of-week.
Brief description of the drawings
For content of the present invention is more likely to be clearly understood, below according to a particular embodiment of the invention and by reference to the accompanying drawings, 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 the other embodiment of the present invention.
Embodiment
The embodiment of microcomputer protecting device anti-interference switch amount testing circuit of the present invention is provided below.
embodiment 1
Microcomputer protecting device anti-interference switch amount testing circuit of the present invention; as shown in Figure 1; comprise at least one switching value unit; be connected with external power source and switching value node; the switching value of detector switch amount node, and output detection signal, because need to detect the switching values of many groups when detector switch amount in practical application; concrete described switching value unit arranges number and arranges according to actual needs, and described external power source is AC power in the present embodiment.
In addition, also comprise the synchronous enabled circuit of power supply, itself and described switching value unit are parallel in described external ac power source, the synchronous enabled signal of its output external ac power source, described synchronous enabled signal can be synchronizeed with described detection signal, in described detection signal, can synchronize with it with the signal of homophase frequently with described synchronous enabled signal, other can not synchronize with it.
Secondly, also be provided with level shifting circuit, be connected with the output of described switching value unit and the output of the synchronous enabled circuit of described power supply respectively, both signals of output are converted to low and high level signal, be specifically converted to high level signal or low level signal is set according to actual needs; Filtering circuit is also set, be connected with the output of described level shifting circuit, filtering asynchronous from described synchronous enabled signal in described detection signal is the detection signal of different frequency homophases, and the signal after filtration sends to microprocessor, carries out status monitoring 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 values unit, and each described switching value unit is connected with corresponding described level shifting circuit and described filtering circuit.
Under synchronous enabled signal function, the only effectively output in the situation that synchronizeing with AC driven power of the detection signal of each switching value unit output.And it is asynchronous owing to responding to the switch output producing under (capacitive sensing or inductance induction) or other disturbed conditions in AC power, due to capacitive character or electro-induction induced voltage, conventionally asynchronous with AC driven power, there is phase differential, therefore under synchronous enabled circuit function, output is not enabled.By synchronous enabled, can distinguish normal switch amount output, or the switch misoperation that causes of other interference or induced voltage.Improve the accuracy that switching value antijamming capability and switching value are confirmed, reach and reduce the especially misoperation of non electrical quantity protection of switching value, improve the reliability of microcomputer protecting device.
embodiment 2
On the basis of the microcomputer protecting device anti-interference switch amount testing circuit described in embodiment 1; as shown in Fig. 2, Fig. 3, Fig. 4, Fig. 5; in the present embodiment; the synchronous enabled circuit of power supply; comprising that the power supply producing with the synchronizing signal of the same frequency homophase of AC driven power is synchronizeed detects the synchronous enabled circuit of photoelectric coupled circuit and switching value output, sees Fig. 2.Wherein, the circuit for generating synchronous signals of AC driven power, this circuit obtains and the synchronizing signal of output AC driving power, is that power supply wherein synchronously detects photoelectric coupled circuit; As shown in the Block Diagrams part of Fig. 3, the waveform of the position output of wherein irising out as shown in the figure; The synchronous enabled circuit of switching value output, with the synchronizing signal of AC power to switch monitoring export and carry out synchronous enabledly, logically realize logical “and” function, as shown in Fig. 4 Block Diagrams part.
Described switching value unit comprises photoelectrical coupler Un, because described switching value unit at least arranges one, so wherein n >=1, in following symbol, n is corresponding with the n in Un, described photoelectrical coupler Un and resistance R n1 and external switch amount Kn are connected in series between the zero line N and live wire L of power supply successively, the light emitting diode two ends of described photoelectrical coupler Un are also parallel with resistance R n2, resistance R n2 is connected in parallel on optocoupler two input ends, form resistance pressure-dividing network with resistance R n1, make optocoupler input end could start optocoupler thering is certain trigger voltage, this trigger voltage can not arrange excessive, otherwise can lower switching value sensitivity, described light emitting diode is as adopted unidirectional optocoupler, use and use diode Dn oppositely in parallel with the input of optocoupler light emitting diode, make it in the time that alternating voltage is reverse, play the effect of protection optocoupler input end.Also can use two-way optocoupler, make switching value unit all have switching value loop at the positive and negative semiaxis of AC driven power, while using two-way optocoupler, diode Dn can omit.
The synchronous enabled circuit of described power supply comprises photoelectrical coupler U0, described photoelectrical coupler U0 and resistance R 01 are connected in series between the zero line and live wire of power supply successively, the two ends of the light emitting diode of described photoelectrical coupler U0 are also parallel with resistance R 02, the light emitting diode of described photoelectrical coupler U0 is as adopted unidirectional optocoupler, its input both sides need be parallel with diode D0, as while using two-way optocoupler, diode D0 can omit, what the synchronous enabled circuit of described power supply was in parallel with described switching value unit is connected on power supply, just can output AC power source with frequently, the synchronous enabled signal of homophase.
Described filtering circuit is low-pass filter circuit in the present embodiment, described low-pass filter circuit comprises resistance R Ln, wherein n >=1, one end of described resistance R Ln is the input end of described low-pass filter circuit, the other end is connected with microprocessor, between described resistance R L1 and microprocessor tie point, be also connected the other end ground connection of described capacitor C Ln with one end of capacitor C Ln.
Described level shifting circuit comprises resistance R n3, described resistance R n3 one end is connected with external power supply Vcc, the other end is connected with the collector of phototriode in described photoelectrical coupler Un, in described photoelectrical coupler Un, the collector of phototriode is also connected with the input end of described low-pass filter circuit, the emitter of the phototriode of described photoelectrical coupler Un is connected with the collector of described photoelectrical coupler U0, the grounded emitter of described photoelectrical coupler U0.
The optocoupler output of the unit of switching value described in the present embodiment, adopt the way of output of Low level effective, in the time that the synchronous enabled signal of AC power is effective, the photoelectrical coupler output conducting ground connection of the synchronous enabled circuit of power supply, if now switching value unit inspection is to switching value closure, its photoelectrical coupler output conducting, and by the optocoupler output ground connection of the synchronous enabled circuit of power supply, form low level, carry out status monitoring through low-pass filter circuit access microprocessor again, and enabling invalid in the situation that, the output conductively-closed of switching value unit, all the time export high level.
Therefore under the synchronous effect of synchronous enabled signal, only in switching value node normally closed situation, AC power is conducting to switching value unit, the detection signal of its optocoupler output is to synchronize with the synchronous enabled signal of the synchronous enabled circuit output of described power supply, therefore can be under synchronous enabled effect, form level signal and send into microprocessor.
embodiment 3
On the basis of the microcomputer protecting device anti-interference switch amount testing circuit described in embodiment 2, as shown in Figure 6, also be provided with driving intensifier circuit, described driving intensifier circuit is connected with the optocoupler output terminal of the synchronous enabled circuit of described power supply and described switching value unit, described driving intensifier circuit comprises resistance R 03 and triode Q1, described resistance R n3 one end is connected with external power supply Vcc, the other end is connected with the collector of phototriode in described photoelectrical coupler Un, in described photoelectrical coupler Un, the collector of phototriode is also connected with the input end of described low-pass filter circuit, the base stage of described triode Q1 is connected with the emitter of the phototriode of described photoelectrical coupler U0 by resistance R 03, the grounded emitter of described triode Q1, the collector of described triode Q1 is connected with the emitter of the phototriode of described photoelectrical coupler Un, the collector external power supply Vcc of the phototriode of described electric coupler U0, described driving intensifier circuit can strengthen the synchronous enabled signal of the synchronous enabled circuit output of described power supply.
embodiment 4
On the basis of the microcomputer protecting device anti-interference switch amount testing circuit described in embodiment 1, as shown in Figure 7, described switching value unit comprises photoelectrical coupler Un, because described switching value unit at least arranges one, so wherein n >=1, in following symbol, n is corresponding with the n in Un, described photoelectrical coupler Un and resistance R n1 and external switch amount Kn are connected in series between the zero line N and live wire L of power supply successively, the light emitting diode two ends of described photoelectrical coupler Un are also parallel with resistance R n2, resistance R n2 is connected in parallel on optocoupler two input ends, form resistance pressure-dividing network with resistance R n1, make optocoupler input end could start optocoupler thering is certain trigger voltage, this trigger voltage can not arrange excessive, otherwise can lower switching value sensitivity, described light emitting diode is as adopted unidirectional optocoupler, use and use diode Dn oppositely in parallel with the input of optocoupler light emitting diode, make it in the time that alternating voltage is reverse, play the effect of protection optocoupler input end.Also can use two-way optocoupler, make switching value unit all have switching value loop at the positive and negative semiaxis of AC driven power, while using two-way optocoupler, diode Dn can omit.。
The synchronous enabled circuit of described power supply comprises photoelectrical coupler U0, described photoelectrical coupler U0 and resistance R 01 are connected in series between the zero line and live wire of power supply successively, the two ends of the light emitting diode of described photoelectrical coupler U0 are also parallel with resistance R 02, what the synchronous enabled circuit of described power supply was in parallel with described switching value unit is connected on power supply, just can the output AC power source synchronous enabled signal of frequency, homophase together.
Described filtering circuit is low-pass filter circuit in the present embodiment, described low-pass filter circuit comprises resistance R Ln, wherein n >=1, one end of described resistance R Ln is the input end of described low-pass filter circuit, the other end is connected with microprocessor, between described resistance R L1 and microprocessor tie point, be also connected the other end ground connection of described capacitor C Ln with one end of capacitor C Ln.
Described level shifting circuit also comprises resistance R n3, described resistance R n3 one end is connected with the emitter of phototriode in described photoelectrical coupler Un, other end ground connection, in described photoelectrical coupler Un, the emitter of phototriode is also connected with the input end of described low-pass filter circuit, the collector of the phototriode of described photoelectrical coupler Un is connected with the emitter of phototriode in described photoelectrical coupler U0, and the collector of described photoelectrical coupler U0 connects power Vcc.
The wiring of high level effective means is pressed in the output of switching value unit and the synchronous enabled circuit of power supply by the present embodiment, in synchronous enabled effective situation, the output conducting of photoelectrical coupler U0, Vcc is loaded into the output terminal of the optocoupler of each switching value unit, now switching value output is enabled, if switching value input block detects the switching value node of closed loop, the optocoupler output conducting of this switching value unit, Vcc drives the on-off state output that produces high level, through low-pass filter, send into microprocessor.Enable invalid in the situation that in switching value, switching value unit remains low level output.
embodiment 5
On the basis of the microcomputer protecting device anti-interference switch amount testing circuit described in embodiment 4, as shown in Figure 8, also be provided with driving intensifier circuit, described driving intensifier circuit is connected with the optocoupler output terminal of the synchronous enabled circuit of described power supply and described switching value unit, described driving intensifier circuit comprises resistance R 03 and triode Q1, described resistance R n3 one end is connected with the emitter of phototriode in described photoelectrical coupler Un, other end ground connection, in described photoelectrical coupler Un, the emitter of phototriode is also connected with the input end of described low-pass filter circuit, in described photoelectrical coupler Un, the collector of phototriode is connected with the collector of described triode Q1, the base stage of described triode Q1 is connected with the collector of the phototriode of described photoelectrical coupler U0 by resistance R 03, the grounded emitter of the phototriode of described photoelectrical coupler U0, the emitter external power supply Vcc of described triode Q1, described driving intensifier circuit can promote driving force.
Obviously, above-described embodiment is only for example is clearly described, and the not restriction to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here without also giving exhaustive to all embodiments.And the apparent variation of being extended out thus or variation are still among the protection domain in the invention.
Claims (10)
1. a microcomputer protecting device anti-interference switch amount testing circuit, comprises at least one switching value unit, is connected the switching value of detector switch amount node, and output switch amount detection signal with external power source and switching value node;
It is characterized in that, also comprise the synchronous enabled circuit of power supply, itself and described switching value unit are parallel on described external power source, the synchronous enabled signal of its output external power source, described switching value signal is carried out synchronously, by enabling output with its detection signal with frequency homophase, by nonsynchronous signal shielding;
Level shifting circuit, is connected with the output of described switching value unit and the output of the synchronous enabled circuit of described power supply respectively, and both signals of output are converted to low and high level signal;
Filtering circuit, is connected with the output of described level shifting circuit, filters in described detection signal and the nonsynchronous detection signal of described synchronous enabled signal, and the signal after filtration sends to microprocessor.
2. switching quantity detection circuit according to claim 1, it is characterized in that, in parallel being connected with external power source between multiple described switching values unit, each described switching value unit is connected with corresponding described level shifting circuit and described filtering circuit.
3. switching quantity detection circuit according to claim 1 and 2, is characterized in that, described filtering circuit is low-pass filter circuit.
4. according to the switching quantity detection circuit described in claim 1-3 any one, it is characterized in that, also comprise driving intensifier circuit, it is connected with the synchronous enabled circuit of described power supply and described switching value unit.
5. according to the switching quantity detection circuit described in claim 1-4 any one, it is characterized in that, described switching value unit comprises photoelectrical coupler Un, wherein n >=1, described photoelectrical coupler Un and resistance R n1 and external switch amount Kn are connected in series between the zero line and live wire of power supply successively, and the light emitting diode two ends of described photoelectrical coupler Un are also parallel with resistance R n2.
6. according to the switching quantity detection circuit described in claim 1-5 any one, it is characterized in that, the synchronous enabled circuit of described power supply comprises photoelectrical coupler U0, described photoelectrical coupler U0 and resistance R 01 are connected in series between the zero line and live wire of power supply successively, and the two ends of the light emitting diode of described photoelectrical coupler U0 are also parallel with resistance R 02.
7. switching quantity detection circuit according to claim 6, is characterized in that, described photoelectrical coupler is bi-directional light electric coupling.
8. according to the switching quantity detection circuit described in claim 6, it is characterized in that, described low-pass filter circuit comprises resistance R Ln, wherein n >=1, one end of described resistance R Ln is the input end of described low-pass filter circuit, the other end is connected with microprocessor, is also connected the other end ground connection of described capacitor C Ln between described resistance R L1 and microprocessor tie point with one end of capacitor C Ln.
9. switching quantity detection circuit according to claim 8, it is characterized in that, described level shifting circuit comprises resistance R n3, described resistance R n3 one end is connected with external power supply Vcc, the other end is connected with the collector of phototriode in described photoelectrical coupler Un, in described photoelectrical coupler Un, the collector of phototriode is also connected with the input end of described low-pass filter circuit, the emitter of the phototriode of described photoelectrical coupler Un is connected with the collector of described photoelectrical coupler U0, the grounded emitter of described photoelectrical coupler U0.
10. switching quantity detection circuit according to claim 9, it is characterized in that, described driving intensifier circuit comprises resistance R 03 and triode Q1, the base stage of described triode Q1 is connected with the emitter of the phototriode of described photoelectrical coupler U0 by resistance R 03, the grounded emitter of described triode Q1, the collector of described triode Q1 is connected with the emitter of the phototriode of described photoelectrical coupler Un, the collector external power supply Vcc of the phototriode of described electric coupler U0;
According to the switching quantity detection circuit described in claim 1-7 any one, it is characterized in that, described level shifting circuit also comprises resistance R n3, described resistance R n3 one end is connected with the emitter of phototriode in described photoelectrical coupler Un, other end ground connection, in described photoelectrical coupler Un, the emitter of phototriode is also connected with the input end of described low-pass filter circuit, the collector of the phototriode of described photoelectrical coupler Un is connected with the emitter of phototriode in described photoelectrical coupler U0, and the collector of described photoelectrical coupler U0 connects power Vcc;
Switching quantity detection circuit according to claim 11, it is characterized in that, described driving intensifier circuit comprises resistance R 03 and triode Q1, the base stage of described triode Q1 is connected with the collector of the phototriode of described photoelectrical coupler U0 by resistance R 03, the grounded emitter of the phototriode of described photoelectrical coupler U0, the emitter external power supply Vcc of described triode Q1, the collector of described triode Q1 is connected with the collector of the phototriode of described photoelectrical coupler Un.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
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| 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 |
| CN115102387A (en) * | 2022-08-24 | 2022-09-23 | 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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| 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 |
| CN115102387A (en) * | 2022-08-24 | 2022-09-23 | 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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