CN106685383A - Switch value input voltage control circuit - Google Patents
Switch value input voltage control circuit Download PDFInfo
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- CN106685383A CN106685383A CN201611257176.0A CN201611257176A CN106685383A CN 106685383 A CN106685383 A CN 106685383A CN 201611257176 A CN201611257176 A CN 201611257176A CN 106685383 A CN106685383 A CN 106685383A
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- optocoupler
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- 230000005611 electricity Effects 0.000 claims description 5
- 230000003287 optical effect Effects 0.000 abstract description 5
- 239000003990 capacitor Substances 0.000 abstract description 4
- 230000000630 rising effect Effects 0.000 abstract 1
- 230000008859 change Effects 0.000 description 7
- 230000008901 benefit Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000000087 stabilizing effect Effects 0.000 description 3
- 230000007257 malfunction Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
- H03K17/081—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit
- H03K17/08112—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit in bipolar transistor switches
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Abstract
The invention discloses a switch value input voltage control circuit. The circuit comprises a positive electrode input end input1, a negative electrode input end input 2, an output end DI1, an optical coupler H1, a current regulative diode D1, a voltage regulator diode Z1, a rectifier diode D2, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C1 and a capacitor C2; the positive electrode input end input1 is electrically connected with the resistor R1, and the second end of the resistor R1 is electrically connected with the first end of the current regulative diode D1, the first end of the capacitor C1 and the first end of the resistor R2. According to the scheme, by utilizing the characteristics of the voltage regulator diode, it is guaranteed that the optical coupler is connected when the Ui is increased to a certain value, and therefore the optical coupler can work after reaching a certain voltage; meanwhile, by means of the characteristics of the current regulative diode, it is guaranteed that the front-end current IF of the optical coupler is limited within a certain range and cannot be increased along with rising of the input voltage, and therefore the low power consumption requirement is met; accordingly, it is guaranteed that the maloperation condition cannot occur when the switch value is used in the industrial field.
Description
Technical field
The present invention relates to field of industrial automation control, and in particular to a kind of On-off signal voltage control circuit.
Background technology
In industrial control process, On-off signal signal usually needs to be provided by external power supply Ui, so as to basis is opened
The change of pass amount state is realizing Industry Control.In order to ensure the reliable, stable of control, input circuit and single-chip microcomputer are usually required that
Processing unit is isolated, to prevent broken ring of the big voltage to single-chip microcomputer, so light-coupled isolation is generally adopted,
Mainly using circuit realiration as shown in Figure 1, its operation principle is existing technical scheme：Input voltage Ui is in R1 resistance
On pressure drop produce optocoupler conducting electric current If, drive optocoupler H1.When Ui voltages be 0 when, optocoupler secondary side voltage be high level, Ui
Increase, If increases；After If exceedes optocoupler conducting electric current, optocoupler conducting, optocoupler secondary side signal conjugates low level by high level,
So as to realize the change of on-off state.
The interference of Industry Control scene is strong, and the interference voltage on On-off signal line normally all reaches tens volts, due to optocoupler
It is current mode Sensitive Apparatus, that is, the value of If directly affects optocoupler secondary side level, if using the decision circuitry of Fig. 1,
It is possible to because the interference voltage at scene causes the unreliable of circuit.In addition, If increases as Ui increases, do not take to If
Restriction, so judge the power consumption in loop also by rapid increase.
The content of the invention
The purpose of the present invention is exactly, in order to solve the above-mentioned problems in the prior art, to propose a kind of anti-interference and low work(
Consumption can be with the switch amount input voltage whether On-off signal voltage control circuit judged more than voltage.
The purpose of the present invention is achieved through the following technical solutions：On-off signal voltage control circuit, the circuit includes
Electrode input end input1, negative input input2, output end DI1, optocoupler H1, commutation diode D2, resistance R1, resistance
R2, resistance R3, resistance R4, electric capacity C1, electric capacity C2；Electrode input end input1 is electrically connected with resistance R1 first ends, resistance R1
Two ends electrically connect with current regulator diode D1 first ends, electric capacity C1 first ends, resistance R2 first ends, optocoupler H1 input cathodes and electricity
Second end of resistance R2, the second end electrical connection of electric capacity C1, negative input input2 is electrically connected with the first end of resistance R3, resistance
Second end of R3 and first end, the electric capacity of the second end electrical connection of commutation diode D2, optocoupler H1 output head anodes and resistance R4
The first end electrical connection of C2, optocoupler H1 negative pole of output end is connected ground connection with second end of electric capacity C2.
Preferably, the circuit also includes a current regulator diode D1, the of the first end of current regulator diode D1 and resistance R1
One end electrically connects, and the second end of the current regulator diode electrically connects with the input anode of optocoupler.
Preferably, a Zener diode Z1 is also associated between the optocoupler H1 and commutation diode, the pole of voltage stabilizing two
The first end of pipe Z1 is electrically connected with optocoupler H1 input cathodes, and the second end electrically connects with the first end of commutation diode D2.
Preferably, second end of the resistance R4 electrically connects with out-put supply VCC.
Preferably, electrode input end input1 and negative input input2 input rated voltage be AC22V or
DC220V or DC110V.
The advantage of technical solution of the present invention is mainly reflected in：The technical program make use of the characteristic of Zener diode, it is ensured that
Optocoupler conducting, is worked with meeting optocoupler after certain voltage after Ui increases to certain value；Simultaneously the characteristic of current regulator diode is protected
Card optocoupler front end electric current If is limited within the specific limits, will not be increased as input voltage is raised, and meets low-power consumption requirement；From
These two aspects ensure that the switching value will not occur the situation of malfunction in industry spot use, and then switch amount input voltage is
It is no to be judged more than voltage, there is anti-interference and low-power consumption.
Description of the drawings
Fig. 1 is the circuit diagram of prior art switching value input circuit；
Fig. 2 is the circuit diagram of switching value input circuit of the present invention.
Specific embodiment
The purpose of the present invention, advantage and feature, by by the non-limitative illustration of preferred embodiment below carry out diagram and
Explain.These embodiments are only the prominent examples using technical solution of the present invention, it is all take equivalent or equivalent transformation and
The technical scheme of formation, all falls within the scope of protection of present invention.
Fig. 2 is the circuit diagram of switching value input circuit, and On-off signal voltage control circuit, the circuit includes that positive pole is input into
End input1, negative input input2, output end DI1, driving optocoupler H1, the current regulator diode of generation optocoupler driving current
D1, zener diode Z1, commutation diode D2, resistance R1, resistance R2, resistance R3, resistance R4, electric capacity C1, electric capacity C2.In this reality
In applying example, the resistance R1 and resistance R3 is current-limiting resistance, and the resistance R2 is anti-interference resistance, and the resistance R4 is pull-up electricity
Resistance, the electric capacity C1 and electric capacity C2 is filter capacitor, and output end VCC is the working power of H1 output ends.The optocoupler H1 is light
Electric coupler, in the present embodiment, the model of the photoelectrical coupler H1 is preferably PC817, and the optocoupler has small volume, life-span
Long, contactless, strong antijamming capability between input and output the advantages of insulation, one-way transmission signal, can transmit consecutive variations
Analog voltage or current signal, as the strong and weak change of input signal can produce corresponding optical signal, so that photosensitive crystal
The conducting degree of pipe is also different, and the voltage or electric current of output is also different therewith.
Electrode input end input1 is electrically connected with resistance R1 first ends, the ends of resistance R1 second and current regulator diode D1 first
End, the electrical connection of electric capacity C1 first ends, resistance R2 first ends, second end of current regulator diode D1 and the first end of optocoupler H1 inputs
Electrical connection.Second end of optocoupler H1 inputs and second end of resistance R2, second end of electric capacity C1, the first of Zener diode Z1
End electrical connection, negative input input2 inputs electrically connect with the first end of resistance R3, second end of resistance R3 and rectification two
The second end electrical connection of pole pipe D2, the first end of commutation diode D2 is electrically connected with second end of zener diode Z1.Optocoupler H1
3rd end of output end electrically connects with the first end of resistance R4, the first end of electric capacity C2, the 4th end and the electricity of optocoupler H1 output ends
Hold the second end connection ground connection of C2, second end of electric capacity C2 is grounded, and the second end and the out-put supply VCC of the resistance R4 are electrically connected
Connect.
In electric control system, AC220V, DC220V, DC110V are frequently used as the specified electricity of On-off signal
Pressure, the circuit is in use by the change of single-chip microcomputer detection switch amount state and then to realize Industry Control.Generally, it is right
The circuit is defined as：When input voltage is less than 50%, circuit is reliably not responding to；When more than 70%, circuit reliable response, institute
Being 65% voltage for being set to action message by input voltage.
The technical scheme is to ensure optocoupler front end electric current If not with input voltage using Zener diode and current regulator diode
Change and change, so as to stablize optocoupler output.Concrete operating principle is as follows, it is assumed that：Ue is the rated value of On-off signal voltage,
U i are On-off signal voltage, and U1e is On-off signal voltage reliably working voltage, and U2e is the specified voltage stabilizing value of voltage-stabiliser tube.
Assume that Ui is stepped up reaching Ue by 0, in the process, this circuit experiences three states：0<Ui<U2e、U2e <Ui<U1e、
U1e <Ui<Ue.When 0<Ui<During U2e, from the characteristic of Zener diode, current regulator diode D1, Zener diode Z1 are flowed through,
Spacing resistance R1, the loop current of spacing resistance R3 compositions is almost 0, optocoupler H1 front ends electric current If=0, and now optocoupler H1 does not lead
It is logical.Work as U2e<Ui<During U1e, Zener diode Z1 starts voltage stabilizing, and current regulator diode D1 is also not up to operating point, flows through constant current
The electric current of diode D1 is almost 0, and with the increase of Ui, optocoupler H1 front ends electric current If starts to increase, when If is sufficiently large, now
Optocoupler H1 is turned on.Work as U1e<Ui<During Ue, current regulator diode D1 starts constant current, and therefore optocoupler H1 front ends electric current If also keeps permanent
It is fixed, it is achieved thereby that constant current.
The technical program make use of the characteristic of Zener diode, it is ensured that the optocoupler conducting after Ui increases to certain value, with full
Sufficient optocoupler works after certain voltage；Simultaneously the characteristic of current regulator diode ensures that optocoupler front end electric current If is limited in certain limit
It is interior, will not increase as input voltage is raised, meet low-power consumption requirement；Ensure that the switching value is existing in industry from these two aspects
Field use will not occur the situation of malfunction, and then whether switch amount input voltage is judged more than voltage, with anti-interference
With the advantage of low-power consumption.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, Er Qie
In the case of spirit and essential characteristics without departing substantially from the present invention, the present invention can be in other specific forms realized.Therefore, no matter
From the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the present invention is by appended power
Profit is required rather than described above is limited, it is intended that all in the implication and scope of the equivalency of claim by falling
Change is included in the present invention, should not be considered as any reference in claim and be limited involved claim.
Moreover, it will be appreciated that although this specification is been described by according to embodiment, not each embodiment is only wrapped
Containing an independent technical scheme, this narrating mode of specification is only that for clarity those skilled in the art should
Using specification as an entirety, the technical scheme in each embodiment can also Jing it is appropriately combined, form those skilled in the art
Understandable other embodiment.
Claims (5)
1. On-off signal voltage control circuit, it is characterised in that：The circuit includes electrode input end input1, negative input
Input2, output end DI1, optocoupler H1, commutation diode D2, resistance R1, resistance R2, resistance R3, resistance R4, electric capacity C1, electric capacity
C2；Electrode input end input1 is electrically connected with resistance R1 first ends, the ends of resistance R1 second and current regulator diode D1 first ends, electric capacity
C1 first ends, second end of the electrical connection of resistance R2 first ends, optocoupler H1 input cathodes and resistance R2, the second end electricity of electric capacity C1
Connection, negative input input2 is electrically connected with the first end of resistance R3,
Second end of resistance R3 and the second end electrical connection of commutation diode D2, optocoupler H1 output head anodes and the first of resistance R4
End, the first end electrical connection of electric capacity C2, optocoupler H1 negative pole of output end is connected ground connection with second end of electric capacity C2.
2. On-off signal voltage control circuit according to claim 1, it is characterised in that：The circuit also includes a constant current
Diode D1, the first end of current regulator diode D1 is electrically connected with the first end of resistance R1, the second end of the current regulator diode with
The input anode electrical connection of optocoupler.
3. On-off signal voltage control circuit according to claim 1, it is characterised in that：Described
A Zener diode Z1, the first end and optocoupler of Zener diode Z1 are also associated between optocoupler H1 and commutation diode
H1 input cathodes are electrically connected, and the second end electrically connects with the first end of commutation diode D2.
4. On-off signal voltage control circuit according to claim 1, it is characterised in that：Second end of the resistance R4
Electrically connect with out-put supply VCC.
5. On-off signal voltage control circuit according to claim 1, it is characterised in that：Electrode input end input1 and
The rated voltage of negative input input2 inputs is AC22V or DC220V or DC110V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611257176.0A CN106685383A (en) | 2016-12-30 | 2016-12-30 | Switch value input voltage control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611257176.0A CN106685383A (en) | 2016-12-30 | 2016-12-30 | Switch value input voltage control circuit |
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| Publication Number | Publication Date |
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| CN106685383A true CN106685383A (en) | 2017-05-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611257176.0A Pending CN106685383A (en) | 2016-12-30 | 2016-12-30 | Switch value input voltage control circuit |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201726315U (en) * | 2010-07-15 | 2011-01-26 | 杨一宁 | Novel constant-current optically-coupled interface device |
| CN102097787A (en) * | 2011-03-15 | 2011-06-15 | 卫斌鹏 | Motor phase sequence default phase protector adopting resistive-capacitive (RC) phase-shift circuit |
| CN202072362U (en) * | 2011-04-01 | 2011-12-14 | 南通普拉尼克机电制造有限公司 | Switching value input interface circuit for elevator control system |
| CN102739235A (en) * | 2012-07-11 | 2012-10-17 | 南车株洲电力机车研究所有限公司 | Switching value acquisition insulating circuit |
| CN202931282U (en) * | 2012-11-29 | 2013-05-08 | 江苏省电力公司南京供电公司 | A general remote signaling acquisition module for distribution network terminals |
| CN105577169A (en) * | 2015-12-11 | 2016-05-11 | 中国北方发动机研究所(天津) | Vehicle-used wide-range voltage switching quantity input circuit |
| CN106199123A (en) * | 2016-08-26 | 2016-12-07 | 广州智光自动化有限公司 | A kind of wide-voltage switch amount collection isolation circuit |
-
2016
- 2016-12-30 CN CN201611257176.0A patent/CN106685383A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201726315U (en) * | 2010-07-15 | 2011-01-26 | 杨一宁 | Novel constant-current optically-coupled interface device |
| CN102097787A (en) * | 2011-03-15 | 2011-06-15 | 卫斌鹏 | Motor phase sequence default phase protector adopting resistive-capacitive (RC) phase-shift circuit |
| CN202072362U (en) * | 2011-04-01 | 2011-12-14 | 南通普拉尼克机电制造有限公司 | Switching value input interface circuit for elevator control system |
| CN102739235A (en) * | 2012-07-11 | 2012-10-17 | 南车株洲电力机车研究所有限公司 | Switching value acquisition insulating circuit |
| CN202931282U (en) * | 2012-11-29 | 2013-05-08 | 江苏省电力公司南京供电公司 | A general remote signaling acquisition module for distribution network terminals |
| CN105577169A (en) * | 2015-12-11 | 2016-05-11 | 中国北方发动机研究所(天津) | Vehicle-used wide-range voltage switching quantity input circuit |
| CN106199123A (en) * | 2016-08-26 | 2016-12-07 | 广州智光自动化有限公司 | A kind of wide-voltage switch amount collection isolation circuit |
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Application publication date: 20170517 |
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| RJ01 | Rejection of invention patent application after publication |