CN103885381A - Wide-voltage PLC input circuit - Google Patents
Wide-voltage PLC input circuit Download PDFInfo
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- CN103885381A CN103885381A CN201410101517.XA CN201410101517A CN103885381A CN 103885381 A CN103885381 A CN 103885381A CN 201410101517 A CN201410101517 A CN 201410101517A CN 103885381 A CN103885381 A CN 103885381A
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Abstract
The invention discloses a wide-voltage PLC input circuit. The wide-voltage PLC input circuit comprises a constant current circuit (10) and an optocoupler circuit (20) connected with the constant current circuit (10), wherein the input side of the optocoupler circuit (20) is connected to the constant current circuit (10), the output side of the optocoupler circuit (20) is connected to a PLC internal processing circuit (30), the constant current circuit (10) is connected with a PLC signal input port used for receiving external input pulse signals, and the constant current circuit (10) is used for keeping the current at the input side of the optocoupler circuit (20) constant when the external input pulse signals are positive pulse and the voltage changes. The wide-voltage PLC input circuit has the advantages of supporting wide-voltage input, effectively protecting the maximum current of an optocoupler, and prolonging the service life of the optocoupler.
Description
Technical field
The present invention relates to PLC technical field, more particularly, relate to a kind of PLC input circuit that can realize wide pressure input.
Background technology
PLC(programmable logic controller (PLC)) be the electronic installation of the digital operation operation of a kind of special application under industrial environment and design.It adopts the storer that can program, be used for storing the instruction that actuating logic computing, sequential operation, timing, counting and arithmetical operation etc. operate therein, and can, by digital or analog input and output, control various types of machinery or production run.
The application of PLC is very extensive, and PLC input circuit is the pith in PLC, and PLC input circuit is mainly used in PLC external input signal to be sent to PLC inter-process circuit, and Fig. 1 shows existing typical PLC input circuit.As shown in Figure 1, this PLC input circuit adopts the resistor network of resistance R 1 ' and resistance R 2 ' composition to realize current limliting in the luminotron part of optocoupler U1, when the outside input pulse signal V1 receiving at PLC signal input port is positive pulse, optocoupler U1 conducting, send 30 1 electronegative potentials of PLC inter-process circuit to, represent that the signal input port of this PLC has signal input.But there is following defect in existing PLC input circuit:
1) due to the restriction of resistor network, in order to ensure the minimum current of optocoupler luminotron part, input voltage can not be too low, otherwise cannot allow the reliable conducting of optocoupler; Input voltage can not be too high, otherwise cause luminotron electric current excessive and easily cause optocoupler damage;
2) in the time of its maximum input voltage, optocoupler luminotron electric current is large, can cause the optocoupler life-span to decline.
Summary of the invention
The technical problem to be solved in the present invention is, for above-mentioned wide pressure input and the short defect of optocoupler life-span do not supported of prior art, provides a kind of wide pressure PLC input circuit, the photoelectric coupled circuit that comprises constant-current circuit and be connected with described constant-current circuit; Wherein: the input side of described photoelectric coupled circuit accesses described constant-current circuit, outgoing side is connected with PLC inter-process circuit; Described constant-current circuit is connected with the PLC signal input port for receiving outside input pulse signal, and for keep the current stabilization of photoelectric coupled circuit input side in the time that outside input pulse signal is positive pulse and change in voltage.
In above-mentioned wide pressure PLC input circuit, described photoelectric coupled circuit comprises optocoupler, and described constant-current circuit comprises the first resistance, the second resistance, the 3rd resistance and the first triode and the second triode; Described the 3rd one end of resistance and the first input end of described optocoupler are connected, the other end of described the 3rd resistance is connected with one end of described the first resistance, the other end of described the first resistance is connected with the base stage of described the first triode and the collector of the second triode respectively, the collector of described the first triode is connected with the second input end of described optocoupler, the emitter of described the first triode is connected with the base stage of described the second triode and one end of described the second resistance respectively, the equal ground connection of the other end of the emitter of described the second triode and described the second resistance.
In above-mentioned wide pressure PLC input circuit, described constant-current circuit also comprises diode, and the anode of described diode is connected with described PLC signal input port, and the negative electrode of described diode is connected with the tie point of the first input end of described the 3rd resistance and described optocoupler.
In above-mentioned wide pressure PLC input circuit, described diode is low pressure drop schottky diode.
In above-mentioned wide pressure PLC input circuit, described constant-current circuit also comprises the electric capacity being connected in parallel with described the 3rd resistance.
In above-mentioned wide pressure PLC input circuit, described the first triode and described the second triode are NPN type triode.
In above-mentioned wide pressure PLC input circuit, described photoelectric coupled circuit also comprises the 4th resistance, one end of described the 4th resistance is connected with PLC internal logic power supply, and the other end of described the 4th resistance is connected with the first output terminal of described optocoupler, the second output head grounding of described optocoupler.
Implement wide pressure PLC input circuit of the present invention, there is following beneficial effect: in certain input voltage range, optocoupler electric current remains unchanged substantially, thereby realize wide pressure input and effectively protect optocoupler maximum current, improve the life-span of optocoupler.And in this PLC input circuit, the value of optocoupler electric current can be set by resistance R 2, is therefore applicable to the optocoupler of various different models, and owing to having adopted constant-current circuit, as long as at the multiple diodes of diode D1 place series connection, minimum input voltage can be set.In addition, resistance R 3 shunt capacitance C1 in input biasing resistor R1, R3, and R1<<R3, can accelerate the conducting of triode, thereby can be suitable for the situation of input at a high speed.
Brief description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the circuit diagram of existing PLC input circuit;
Fig. 2 is the schematic diagram of the wide pressure of the present invention PLC input circuit embodiment;
Fig. 3 is the circuit diagram of wide pressure PLC input circuit in Fig. 2;
Fig. 4 is the curve map that the optocoupler electric current of the wide pressure of the present invention PLC input circuit embodiment changes with input voltage.
Embodiment
Understand for technical characterictic of the present invention, object and effect being had more clearly, now contrast accompanying drawing and describe the specific embodiment of the present invention in detail.
As shown in Figure 2, be the schematic diagram of the wide pressure of the present invention PLC input circuit embodiment.In the PLC of the present embodiment input circuit, comprise constant-current circuit 10 and photoelectric coupled circuit 20.The input end of constant-current circuit 10 is connected with PLC signal input port, this signal input port is used for receiving outside input pulse signal V1, the output terminal of constant-current circuit 10 is connected with the input end of photoelectric coupled circuit 20, and the output terminal of photoelectric coupled circuit 20 is connected with PLC inter-process circuit 30.Constant-current circuit 10 for keeping optocoupler current stabilization in the time that outside input pulse signal V1 is positive pulse and change in voltage.Photoelectric coupled circuit 20 comprises optocoupler U1 and pull-up resistor R4 thereof, and one end of resistance R 4 is PLC equipment itself with PLC internal logic power vd D() be connected, the other end of resistance R 4 is connected with the first output terminal of optocoupler U1.In the time that outside input pulse signal is positive pulse, optocoupler conducting, sends 30 1 electronegative potentials of PLC inter-process circuit to, represents that signal input port has signal input.
PLC input circuit of the present invention can be realized wide pressure input, simultaneously in the voltage range of regulation, can make the electric current of photoelectric coupled circuit input side substantially remain unchanged by constant-current circuit 10, the input voltage of this PLC input circuit can possess very large scope, improve the scope of application of PLC input, therefore realized wide pressure input.
In addition, PLC input circuit is for improving antijamming capability, by adopting the optocoupler U1 can isolating exterior input pulse signal V1 and the transmission of PLC inter-process circuit 30, therefore, outside input pulse signal drives the interior light emitting diodes conducting of optocoupler by constant-current circuit 10, photoelectric tube by optocoupler receives, and can make outside input pulse signal transmitting.
As shown in Figure 3, be the circuit diagram of wide pressure PLC input circuit in Fig. 2, wherein, resistance R 1, resistance R 2, resistance R 3 and triode Q1 and triode Q2 form the constant-current circuit 10 for light emitting diode in optocoupler U1.One end of resistance R 3 is connected with the first input end of optocoupler U1, the other end of resistance R 3 is connected with one end of resistance R 1, the other end of resistance R 1 is connected with the base stage of triode Q1 and the collector of triode Q2 respectively, the collector of triode Q1 is connected with the second input end of optocoupler U1, the emitter of triode Q1 is connected with the base stage of triode Q2 and one end of resistance R 2 respectively, the equal ground connection of the other end of the emitter of triode Q2 and resistance R 2.
Above-mentioned constant-current circuit 10 also comprises diode D1, and the anodic bonding PLC signal input port of diode D1, receives outside input pulse signal, and the negative electrode of diode D1 is connected with the tie point of the first input end of resistance R 3 and optocoupler U1.This diode D1 is anti-reverse diode, be preferably low pressure drop schottky diode, because low pressure drop schottky diode forward voltage only needs 0.3V, and the forward voltage of general diode is 0.7V, therefore selects low pressure drop schottky diode can realize wider voltage input.In addition, owing to adopting this constant-current circuit to realize when the PLC wide range input, also can keep optocoupler electric current basicly stable, multiple diodes of can connecting at diode D1 place, can arrange minimum input voltage.
Above-mentioned constant-current circuit 10 also comprises that the capacitor C 1(being connected in parallel with resistance R 3 is equivalent to speed-up capacitor), resistance R 1 and R3 form the biasing resistor of triode Q1, can select higher value, only need make R1<<R3, in the situation that having pulse input, can accelerate the base stage of electric signal arrival triode Q1, if input pulse signal is positive pulse, can accelerate the conducting of triode Q1, thereby can be suitable for the situation of high-speed pulse input.
Above-mentioned optocoupler U1 comprises first input end and the second input end and the first output terminal and the second output terminal, first input end is the anode of light emitting diode in optocoupler U1, the second input end is the negative electrode of light emitting diode in optocoupler U1, the first output terminal is the collector of triode in optocoupler U1, and the second output terminal is the emitter of triode in optocoupler U1.
The specific works principle of now introducing in detail the wide pressure of the present invention PLC input circuit is as follows:
1) in the time that the outside input pulse signal of PLC V1 is positive pulse, suppose that input voltage is enough high, triode Q1 and triode Q2 are all in positively biased conducting, while making triode Q1 and triode Q2 conducting, voltage between base stage b and the emitter e of triode Q1 is Vbe1 (on), voltage between base stage b and the emitter e of triode Q2 is Vbe2 (on), taking silicone tube as example, can draw the voltage between collector and the emitter of triode Q2 according to this circuit
Vce2=Vbe1(on)+Vbe2(on)≈1.2V>Vce2(sat)=0.3V;
Wherein, Vce2 (sat) is the saturation conduction voltage between triode Q2 collector and emitter, therefore learns that it is amplification region that triode Q2 is operated in linear zone.
And voltage between collector c and the emitter e of triode Q1
Vce1=Vin-Vd1(on)-Vled-Vbe2(on)；
Wherein, Vin is the voltage magnitude of the outside input pulse signal of PLC V1, Vd1 (on) is the forward voltage of diode D1, Vled is the forward voltage of light emitting diode in optocoupler U1, therefore require Vce1>Vce1 (sat), be that voltage Vce1 between collector c and the emitter e of triode Q1 is greater than the saturation conduction voltage between triode Q1 collector and emitter, only need the outside input pulse signal of regulation PLC V1 amplitude can realize triode Q1 and be operated in linear zone.
2) when triode Q1 and triode Q2 are all operated in linear zone, Ic1 ≈ β
1ib1, Ic2 ≈ β
2ib2, wherein, Ib1 and Ic1 are respectively base current and the collector current of triode Q1, and Ib2 and Ic2 are respectively base current and the collector current of triode Q2, and β
1and β
2be respectively the current amplification factor of triode Q1 and Q2, generally, more than 30 times, therefore can draw Ib1<<Ic1, Ib2<<Ic2.
And electric current in resistance R 2
IR2=Vbe2 (on)/R2=Ie1-Ib2, obtains
Ie1=IR2+Ib2；
Wherein, Ie1 is the emitter current of triode Q1;
Optocoupler electric current is the electric current that flows through light emitting diode in optocoupler U1
Iled=Ic1=Ie1-Ib1, substitution Ie1 obtains
Iled=IR2-Ib1+Ib2；
And the base current Ib1 of triode Q1 and the base current Ib2 of triode Q2 are all very little, therefore can ignore, i.e. Iled=IR2=Vbe2 (on)/R2.
Voltage Vbe2 (on) when triode Q2 conducting between its base stage and emitter is generally definite value, and for example silicone tube, is approximately 0.6V.Therefore optocoupler current value is not affected by the voltage magnitude Vin of the outside input pulse signal of PLC, is steady state value, even if input voltage changes in wide region, optocoupler current value remains unchanged substantially, has therefore realized wide pressure input.And because of optocoupler electric current only relevant with the resistance of resistance R 2, therefore can be by the resistance of resistance R 2 is set, thus be applicable to the optocoupler of different model.
In addition resistance R 1 and resistance R 3 are triode biasing resistor, can select higher value, make R1<<R3, and in resistance R 3 shunt capacitance C1(speed-up capacitor), therefore in the situation that having pulse signal input, can accelerate the base stage of electric signal arrival triode Q1, if outside input pulse signal is positive pulse, can accelerate the conducting of triode Q1 and Q2, thereby be applicable to the situation of input at a high speed.
As shown in Figure 3, for optocoupler electric current I led in the wide pressure of the present invention PLC input circuit embodiment is the curve map that input voltage vin changes with the voltage magnitude of the outside input pulse signal of PLC, in conjunction with the circuit diagram shown in Fig. 3, correlation parameter is set in the present embodiment as follows: R1=1K Ω, R2=200 Ω, R3=30K Ω, On current Iled (on) >2mA of optocoupler U1, the forward voltage of diode D1 is 0.3V, optocoupler forward voltage is 1.4V, Vbe2 (on) ≈ 0.6V, speed-up capacitor C1=1000pf, draw curve map as shown in Figure 3 through emulation and actual test data, in the time that input voltage vin is 5V, optocoupler starts conducting as we know from the figure, On current is 2.24mA, when input voltage continues to be elevated to 40V, optocoupler electric current is 2.9mA.Therefore; differ from 5V to 40V at input voltage the change in voltage situation of 8 times; optocoupler electric current has only changed 2.9/2.24=1.2 doubly; obviously the wide pressure of the present invention PLC input circuit has effectively been protected the maximum current of optocoupler light emitting diode; in the life-span of also having improved optocoupler, realize optocoupler electric current and changed very little along with the rising of input voltage simultaneously.
Implement the wide pressure of the present invention PLC input circuit, can be in certain input voltage range, optocoupler electric current is protected constant substantially, thereby realizes wide pressure input and effectively protect optocoupler maximum current, improves the life-span of optocoupler.And the value of optocoupler electric current can be set by resistance R 2, go for the optocoupler of various different models, be same as owing to having adopted constant-current circuit, as long as at the multiple diodes of diode D1 place series connection, minimum input voltage can be set, resistance R 3 shunt capacitance C1 in input biasing resistor R1, R3, and R1<<R3, the conducting of triode can be accelerated, thereby the situation of input at a high speed can be suitable for.
By reference to the accompanying drawings embodiments of the invention are described above; but the present invention is not limited to above-mentioned embodiment; above-mentioned embodiment is only schematic; instead of restrictive; those of ordinary skill in the art is under enlightenment of the present invention; not departing from the scope situation that aim of the present invention and claim protect, also can make a lot of forms, within these all belong to protection of the present invention.
Claims (7)
1. a wide pressure PLC input circuit, is characterized in that, the photoelectric coupled circuit (20) that comprises constant-current circuit (10) and be connected with described constant-current circuit (10); Wherein: the input side of described photoelectric coupled circuit (20) accesses described constant-current circuit (10), outgoing side is connected with PLC inter-process circuit (30); Described constant-current circuit (10) is connected with the PLC signal input port for receiving outside input pulse signal, and for keep the current stabilization of photoelectric coupled circuit input side in the time that outside input pulse signal is positive pulse and change in voltage.
2. wide pressure PLC input circuit according to claim 1, it is characterized in that, described photoelectric coupled circuit (20) comprises optocoupler (U1), and described constant-current circuit (10) comprises the first resistance (R1), the second resistance (R2), the 3rd resistance (R3) and the first triode (Q1) and the second triode (Q2), one end of described the 3rd resistance (R3) is connected with the first input end of described optocoupler (U1), the other end of described the 3rd resistance (R3) is connected with one end of described the first resistance (R1), the other end of described the first resistance (R1) is connected with the base stage of described the first triode (Q1) and the collector of the second triode (Q2) respectively, the collector of described the first triode (Q1) is connected with the second input end of described optocoupler (U1), the emitter of described the first triode (Q1) is connected with the base stage of described the second triode (Q2) and one end of described the second resistance (R2) respectively, the equal ground connection of the other end of the emitter of described the second triode (Q2) and described the second resistance (R2).
3. PLC input circuit according to claim 2, it is characterized in that, described constant-current circuit (10) also comprises diode (D1), the anode of described diode (D1) is connected with described PLC signal input port, and the negative electrode of described diode (D1) is connected with the tie point of the first input end of described the 3rd resistance (R3) and described optocoupler (U1).
4. PLC input circuit according to claim 3, is characterized in that, described diode (D1) is low pressure drop schottky diode.
5. PLC input circuit according to claim 2, is characterized in that, described constant-current circuit (10) also comprises the electric capacity (C1) being connected in parallel with described the 3rd resistance (R3).
6. PLC input circuit according to claim 2, is characterized in that, described the first triode (Q1) and described the second triode (Q2) are NPN type triode.
7. PLC input circuit according to claim 2, it is characterized in that, described photoelectric coupled circuit (20) also comprises the 4th resistance (R4), one end of described the 4th resistance (R4) is connected with PLC internal logic power supply, the other end of described the 4th resistance (R4) is connected with the first output terminal of described optocoupler (U1), the second output head grounding of described optocoupler (U1).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017147807A1 (en) * | 2016-03-02 | 2017-09-08 | 马骏 | Novel sewage treatment system based on feedback control technology |
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| US20130188752A1 (en) * | 2012-01-20 | 2013-07-25 | Lsis Co., Ltd. | Analog input and output module |
| CN203191768U (en) * | 2013-02-28 | 2013-09-11 | 西门子公司 | Digital signal input circuit |
| CN103576597A (en) * | 2012-07-24 | 2014-02-12 | 施耐德电器工业公司 | Digital quantity input interface device, programmable logic controller comprising digital quantity input interface device and method of digital quantity input interface device |
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2014
- 2014-03-18 CN CN201410101517.XA patent/CN103885381B/en active Active
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| US20040174200A1 (en) * | 2003-02-26 | 2004-09-09 | Mcnutt Alan D. | Pulse output function for programmable logic controller with linear frequency change |
| CN102436211A (en) * | 2011-12-16 | 2012-05-02 | 深圳市合信自动化技术有限公司 | PLC (programmable logic controller) and various input voltage compatibility method thereof |
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| US20130188752A1 (en) * | 2012-01-20 | 2013-07-25 | Lsis Co., Ltd. | Analog input and output module |
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Effective date of registration: 20221123 Address after: 518000 Huichuan technology headquarters building, Guanlan high tech Industrial Park, Longhua New District, Shenzhen City, Guangdong Province Patentee after: SHENZHEN INOVANCE TECHNOLOGY Co.,Ltd. Address before: 518000 room 306, 3rd floor, building 16, Shangsha innovation and Technology Park, Binhe Road, Futian District, Shenzhen City, Guangdong Province Patentee before: Shenzhen Inovance Control Technology Co.,Ltd. |