CN202522657U - Ground wire monitoring circuit and system - Google Patents
Ground wire monitoring circuit and system Download PDFInfo
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- CN202522657U CN202522657U CN2012201851801U CN201220185180U CN202522657U CN 202522657 U CN202522657 U CN 202522657U CN 2012201851801 U CN2012201851801 U CN 2012201851801U CN 201220185180 U CN201220185180 U CN 201220185180U CN 202522657 U CN202522657 U CN 202522657U
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Abstract
The utility model discloses an earth connection monitoring circuit and system, this circuit includes: the device comprises an in-phase proportional operational amplifier circuit and a differential operational amplifier circuit, wherein the negative input end of the in-phase proportional operational amplifier circuit is connected to a grounding wire, and the positive input end of the in-phase proportional operational amplifier circuit inputs a first voltage value; the negative input end of the differential operational amplification circuit is connected to the output end of the in-phase proportional operational amplification circuit, the positive input end of the differential operational amplification circuit inputs a second voltage value, and the output end of the differential operational amplification circuit outputs a monitoring result of the grounding wire. The utility model discloses a two operational amplification circuit gather the earth connection signal, output monitoring result to realize the real time monitoring of earth connection, eliminated the unreliability of artifical monitoring.
Description
Technical field
The utility model relates to the communications field, in particular to a kind of ground wire observation circuit and system.
Background technology
Along with the integrated degree of present electronic product is increasingly high, static is also increasing to its harm that causes, and whether static can in time release, and has influenced the quality of product.Static electricity release generally realizes through the static line effective grounding.Therefore need the conducting situation of static line be detected.
General multimeter or other equipment of using of detection management about static line carries out the manual testing at present, and real-time is relatively poor, and controlled degree is very low, and can not realize remote monitoring.
The utility model content
The utility model provides a kind of ground wire observation circuit and system, and to solve at least in the correlation technique, the monitoring of static line uses multimeter or other equipment to carry out the manual testing, can not realize the problem of monitoring in real time.
An aspect according to the utility model; A kind of ground wire observation circuit is provided, has comprised in-phase proportion operational amplification circuit and calculus of differences amplifying circuit, wherein; The negative input of in-phase proportion operational amplification circuit is connected to ground wire, and positive input is imported first magnitude of voltage; The negative input of calculus of differences amplifying circuit is connected to the output terminal of in-phase proportion operational amplification circuit, and positive input is imported second magnitude of voltage, the monitoring result of output terminal output ground wire.
Preferably, the in-phase proportion operational amplification circuit comprises: first operational amplifier; First resistance is connected between the negative input of the ground wire and first operational amplifier; Second resistance is connected between the output terminal of negative input and first operational amplifier of first operational amplifier.
Preferably, the in-phase proportion operational amplification circuit also comprises: the 3rd resistance is connected to the positive input of first operational amplifier, and imports first magnitude of voltage through the 3rd resistance.
Preferably, the calculus of differences amplifying circuit comprises: second operational amplifier; The 4th resistance is connected to the output terminal of first operational amplifier and the negative input of second operational amplifier; The 5th resistance, be connected to second operational amplifier positive input and ground; The 6th resistance is connected to the positive input of second operational amplifier, and imports second magnitude of voltage through the 6th resistance; The 7th resistance is connected to the negative input of second operational amplifier and the output terminal of second operational amplifier.
According to another aspect of the utility model, a kind of ground wire monitoring system is provided, comprise ground wire observation circuit and warning circuit, wherein, the ground wire observation circuit is above-mentioned any ground wire observation circuit; Warning circuit is connected to the output terminal of ground wire observation circuit, is used for reporting to the police according to the monitoring result of ground wire.
Preferably, in the monitoring result of ground wire during greater than the driving voltage of warning circuit, warning circuit produces light through pilot lamp and reports to the police and/or produce acoustic alarm through hummer.
Preferably, the ground wire monitoring system also comprises voltage conversion circuit, is used for the 220V voltage transitions is become the required voltage of ground wire observation circuit.
According to another aspect of the utility model, a kind of ground wire monitoring system is provided,, comprise ground wire observation circuit and communication module, wherein, the ground wire observation circuit is above-mentioned any ground wire observation circuit; Communication module is connected to the output terminal of ground wire observation circuit, is used for the monitoring result of ground wire is transferred to the user.
Preferably, communication module comprises: voltage comparator, be connected to the output terminal of ground wire observation circuit, and be used for converting the monitoring result of ground wire to voltage signal that single-chip microcomputer can be gathered; Single-chip microcomputer is connected to voltage comparator, is used to gather voltage signal; 485 change 232 communication modules, are connected to single-chip microcomputer, and being used for converting voltage signal to host computer can identified signal, and is transferred to host computer.
Preferably, the ground wire monitoring system also comprises voltage conversion circuit, is used for the 220V voltage transitions is become ground wire observation circuit and the required voltage of communication module.
The utility model is gathered ground line signals through two operational amplification circuits, exports monitoring result, thereby is grounded the real-time monitoring of line, has eliminated personal monitoring's unreliability.
Description of drawings
Accompanying drawing described herein is used to provide the further understanding to the utility model, constitutes the application's a part, and illustrative examples of the utility model and explanation thereof are used to explain the utility model, do not constitute the improper qualification to the utility model.In the accompanying drawings:
Fig. 1 is the synoptic diagram according to the ground wire observation circuit of the utility model embodiment;
Fig. 2 is the synoptic diagram according to the ground wire observation circuit of the utility model preferred embodiment;
Fig. 3 is the synoptic diagram one according to the ground wire monitoring system of the utility model embodiment;
Fig. 4 is the synoptic diagram two according to the ground wire monitoring system of the utility model embodiment;
Fig. 5 is the principle schematic according to the ground wire observation circuit of the utility model preferred embodiment;
Fig. 6 is the circuit diagram according to the ground wire monitoring system of the utility model preferred embodiment;
Fig. 7 is the module diagram according to the ground wire monitoring system of the utility model preferred embodiment;
Fig. 8 is the synoptic diagram according to the voltage conversion circuit of the utility model preferred embodiment;
Fig. 9 is the synoptic diagram according to the pipe that takes a policy of the utility model preferred embodiment.
Embodiment
Need to prove that under the situation of not conflicting, embodiment and the characteristic among the embodiment among the application can make up each other.Below with reference to accompanying drawing and combine embodiment to specify the utility model.
In the correlation technique, the monitoring of static line uses multimeter or other equipment to carry out the manual testing, can not realize real-time monitoring.For this reason, the utility model embodiment provides a kind of ground wire observation circuit, has realized the real-time monitoring of ground wire.
Fig. 1 is the synoptic diagram according to the ground wire observation circuit of the utility model embodiment; As shown in Figure 1; This ground wire observation circuit comprises in-phase proportion operational amplification circuit and calculus of differences amplifying circuit; Wherein, the negative input of in-phase proportion operational amplification circuit is connected to ground wire, and positive input is imported first magnitude of voltage (V1); The negative input of calculus of differences amplifying circuit is connected to the output terminal of in-phase proportion operational amplification circuit, and positive input is imported second magnitude of voltage (V2), the monitoring result of output terminal output ground wire.
In the foregoing description, gather ground line signals, export monitoring result, thereby be grounded the real-time monitoring of line, eliminated personal monitoring's unreliability through two operational amplification circuits.
Below in conjunction with Fig. 2 in-phase proportion operational amplification circuit and calculus of differences amplifying circuit are described.
The in-phase proportion operational amplification circuit comprises: first operational amplifier (U1); First resistance (R1) is connected between the negative input of ground wire and first operational amplifier (U1); Second resistance (R3) is connected between the output terminal of negative input and first operational amplifier (U1) of first operational amplifier (U1).Wherein, the power end input voltage value V3 of first operational amplifier (U1).
Preferably, the in-phase proportion operational amplification circuit can also comprise: the 3rd resistance (R2) is connected to the positive input of first operational amplifier (U1), and passes through the 3rd resistance (R2) input first magnitude of voltage (V1).
The calculus of differences amplifying circuit comprises: second operational amplifier (U2); The 4th resistance (R4) is connected to the output terminal of first operational amplifier (U1) and the negative input of second operational amplifier (U2); The 5th resistance (R5), be connected to second operational amplifier (U2) positive input and ground; The 6th resistance (R6) is connected to the positive input of second operational amplifier (U2), and passes through the 6th resistance (R6) input second magnitude of voltage (V2); The 7th resistance (R7) is connected to the negative input of second operational amplifier (U2) and the output terminal of second operational amplifier (U2).Wherein, the power end input voltage value V4 of second operational amplifier (U2).
From the above, the ground wire observation circuit of the utility model embodiment is fairly simple, and can realize real-time monitoring.The inherent characteristic of utilizing operational amplifier and empty short empty disconnected principle can be through choosing certain resistance, the voltage of control output end output, thus reflect the break-make of ground wire.
The utility model embodiment also provides a kind of ground wire monitoring system, and is as shown in Figure 3, and this system comprises ground wire observation circuit and warning circuit, and wherein, the ground wire observation circuit is above-mentioned ground wire observation circuit; Warning circuit is connected to the output terminal of ground wire observation circuit, is used for reporting to the police according to the ground wire monitoring result of ground wire observation circuit output.
In the present embodiment; Can guarantee output different voltages with different signal when ground wire conducting and the not conducting through selecting the suitable amplifier and the size of adjustment resistance for use; Whether the decision of this voltage signal can drive warning circuit is reported to the police, and can let the user know whether conducting of ground wire more intuitively.
In the monitoring result of ground wire during greater than the driving voltage of warning circuit, warning circuit produces light through pilot lamp and reports to the police and/or produce acoustic alarm through hummer.
Owing to the voltage that the ground wire observation circuit is required is less, need be required voltage with the 220V voltage transitions.So the preferred implementation of the utility model embodiment is following: above-mentioned ground wire monitoring system also comprises voltage conversion circuit, be used for the 220V voltage transitions is become the required voltage of ground wire observation circuit.
In order to realize remote monitoring; The utility model embodiment also provides another kind of ground wire monitoring system; Fig. 4 is the synoptic diagram two according to the ground wire monitoring system of the utility model embodiment, and is as shown in Figure 4, and this system comprises ground wire observation circuit and communication module; Wherein, the ground wire observation circuit is above-mentioned ground wire observation circuit; Communication module is connected to the output terminal of ground wire observation circuit, is used for the monitoring result of ground wire is transferred to the user.
In the present embodiment, the information that the user can upload according to communication module, the situation of remote monitoring ground wire.
Wherein, communication module comprises: voltage comparator, be connected to the output terminal of ground wire observation circuit, and be used for converting the monitoring result of ground wire to voltage signal that single-chip microcomputer can be gathered; Single-chip microcomputer is connected to voltage comparator, is used to gather voltage signal; 485 change 232 communication modules, are connected to single-chip microcomputer, and being used for converting voltage signal to host computer can identified signal, and is transferred to host computer.
Above-mentioned communication module can adopt wireless and wired two kinds, and the signal that single-chip microcomputer receives after the processing can be transferred to host computer with signal through wireless or wired mode, on computer monitor, demonstrates the conducting situation of ground wire then through upper computer software.
Because the required voltage of ground wire observation circuit and communication module is less, need be required voltage with the 220V voltage transitions.The ground wire monitoring system also comprises voltage conversion circuit, is used for the 220V voltage transitions is become ground wire observation circuit and the required voltage of communication module.
Certainly, the ground wire monitoring system of the utility model also can comprise warning circuit and communication module simultaneously, promptly can report to the police and realizes remote monitoring.
To combine accompanying drawing and instantiation that the implementation procedure of the utility model embodiment is described in detail below.
The ground wire observation circuit adopts modular design, can promptly can realize the multichannel monitoring according to how many arbitrarily interpolations of the antistatic aids of monitoring.
As shown in Figure 5, be input as 5V with the forward of U1, it is example that the forward of U2 is input as 12V.X3 links to each other with earth point on the antistatic aids (like the equipment of need ground connection such as electrostatic prevention mat applying, ESD-preventive wrist strap) through lead, thereby X4 passes through the lead formation detection loop that links to each other with total ground wire.The signal that collects from X3 amplifies (U1 is the two-way operational amplifier) back output 2OUT signal through two-stage calculation.If it is intact that the monitoring point ground wire connects; Resistance sizes through the adjustment operational amplification circuit can make the driving voltage of the voltage of 2OUT port output less than warning circuit so; The optocoupler U2 of warning circuit can not be driven like this, its not conducting of output stage, and the sound and light alarm lamp just can not be triggered, and (for example driving voltage is 10V; Output voltage is not just reported to the police less than 10V so; Can set a threshold value less than driving voltage, output voltage does not produce warning during less than threshold value yet).If monitoring point not conducting of ground wire, the voltage of 2OUT mouth output can drive optocoupler U2 greater than the driving voltage of warning circuit so, makes the conducting of optocoupler output stage, thereby triggers the alarm lamp sound and light alarm.
Fig. 6 is the circuit diagram according to the ground wire monitoring system of the utility model preferred embodiment; As shown in Figure 6; X1 links to each other with earth point on the antistatic aids (like the equipment of need ground connection such as electrostatic prevention mat applying, ESD-preventive wrist strap) through lead, thereby X2 passes through the lead formation detection loop that links to each other with total ground wire.The detection principle of this system is: the inherent characteristic of utilizing operational amplifier is (when the theory that calculates is exported greater than the supply voltage (being 12V in this preferred embodiment) of amplifier; Actual output size is exactly the supply voltage of amplifier), and combine " empty short empty disconnected " principle design to go out the two-stage amplifying circuit.In this preferred embodiment, the power end input voltage of U1 and U2 is 12V.
Previous stage is the in-phase proportion operational amplification circuit, and output voltage calculates according to following formula: Vout1=(1+R3/R1) * Vi, wherein Vi=5v.Back one-level is a differential amplifier circuit, and output voltage calculates according to following formula: Vout2=Vi2*R5* (R4+R7)/[(R6+R5) R4]-Vi1*R7/R4, and Vi1=Vout1 wherein, Vi2=12V gets R4=R6, R7=R5, then Vout2=(Vi2-Vi1) * R5/R6.Among the utility model embodiment, R1, R3, R5, R6 confirm through the actual verification that repeats, and wherein, need satisfy certain proportionate relationship (greater than 1.4) between R1 and the R3.In this preferred embodiment, R1 selects bigger resistance (mega-ohms) for use.
In this preferred embodiment, when the ground wire conducting of monitoring point, Vout1=(1+R3/R1) * Vi; According to R1 and R3, calculate Vout1=12V, Vi1=Vout1 again; Vi2=12V, Vout2=(Vi2-Vi1) * R5/R6 is not difficult to find out Vout2=0V this moment; Optocoupler U3 circuit is not worked, i.e. system's alarm free.In addition, the negative input voltage of U1 is received power supply through R1, and electric current is about I1=Vi/R1, and wherein Vi=5v so I1 is a microampere order, does not have influence to circuit.
If fracture of the ground wire of monitoring point or not conducting, the negative input that is equivalent to U1 so connects infinitely-great resistance, and promptly R1 is infinitely great.This moment Vout1 ≈ Vi=5V, Vi1=Vout1 again, Vi2=12V, Vout2=(Vi2-Vi1) * R5/R6.Need to prove, can choose certain resistance value R5 and R6 arbitrarily during design circuit, make the size of Vout2 can drive optocoupler work and get final product.For example, in this preferred embodiment, finally calculate Vout2=12V, can drive optocoupler U3 work this moment, secondary output 12V drives and reports to the police, and pilot lamp sends the light warning and/or hummer sends acoustic alarm.
Remote monitoring for ease; Can in the ground wire monitoring system, add communication module; Be connected to and detect processing module (being above-mentioned ground wire observation circuit); Also drawn among Fig. 7 voltage transformation module and alarm module, as shown in Figure 7, this communication module comprises: voltage comparator, single-chip microcomputer and 485 change 232 communication modules.At first, the voltage signal Vout2 that exports through voltage comparator butt joint ground-wire monitoring circuit carries out level conversion and Filtering Processing, and what make its output is the level signal that single-chip microcomputer can collect.Then; Voltage signal the sample monitoring of single-chip microcomputer after to conversion, collect signal after, signal data is sent to host computer through 485 commentaries on classics, 232 communication modules; After host computer is received signal data; Through software processes, can testing result be presented on the interface with certain form, and preserve data.Managerial personnel can not go out office and just can monitor like this, and the record before can inquiring about at any time.
In addition, because the required voltage of ground wire observation circuit and communication module is less, so need utilize transformer and voltage conversion circuit (specifically referring to Fig. 8) to convert ambient voltage 220V into required voltage.Be example with circuit shown in Figure 6 below, introduce the process of voltage transitions.The required voltage of ground wire observation circuit is 12V; The communication module required voltage is 5V; Particularly, the transformer input end can meet 220V/230V, the 50Hz/60Hz alternating voltage; Output terminal is 12.5V 400mA and 8.5V 100mA alternating voltage, and (D9～D16) rectifier bridge of composition converts DC voltage into through diode then.12.5V and after the voltage stabilizing of the DC voltage of 8.5V through voltage stabilizing chip 7812,7805 and electric capacity, become the normal voltage of 12V and 5V.As shown in Figure 9, the pipe that can also between zero live wire, take a policy, the security that can improve the ground wire monitoring system like this.
In sum, according to the foregoing description of the utility model, a kind of ground wire observation circuit and system are provided.The utility model has not only been realized the real-time of ground wire monitoring, and has eliminated the unreliability of bringing owing to manual detection, and control circuit is more simple simultaneously, and can realize remote monitoring.The utility model is realized the real-time monitoring of multichannel ground conductive situation, can find the ground conductive condition of poor timely, reminding employees in time safeguards, has reduced that static that the ground thread breakage causes can't be released and the electrostatic damage that brings.
The preferred embodiment that the above is merely the utility model is not limited to the utility model, and for a person skilled in the art, the utility model can have various changes and variation.All within the spirit and principle of the utility model, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection domain of the utility model.
Claims (10)
1. a ground wire observation circuit is characterized in that, comprises in-phase proportion operational amplification circuit and calculus of differences amplifying circuit, wherein,
The negative input of said in-phase proportion operational amplification circuit is connected to ground wire, and positive input is imported first magnitude of voltage;
The negative input of said calculus of differences amplifying circuit is connected to the output terminal of said in-phase proportion operational amplification circuit, and positive input is imported second magnitude of voltage, and output terminal is exported the monitoring result of said ground wire.
2. ground wire observation circuit according to claim 1 is characterized in that, said in-phase proportion operational amplification circuit comprises:
First operational amplifier (U1);
First resistance (R1) is connected between the negative input of said ground wire and said first operational amplifier (U1);
Second resistance (R3) is connected between the output terminal of negative input and said first operational amplifier (U1) of said first operational amplifier (U1).
3. ground wire observation circuit according to claim 2; It is characterized in that; Said in-phase proportion operational amplification circuit also comprises: the 3rd resistance (R2) is connected to the positive input of said first operational amplifier (U1), and passes through said first magnitude of voltage of said the 3rd resistance (R2) input.
4. ground wire observation circuit according to claim 1 is characterized in that, said calculus of differences amplifying circuit comprises:
Second operational amplifier (U2);
The 4th resistance (R4) is connected to the output terminal of said first operational amplifier (U1) and the negative input of said second operational amplifier (U2);
The 5th resistance (R5), be connected to said second operational amplifier (U2) positive input and ground;
The 6th resistance (R6) is connected to the positive input of said second operational amplifier (U2), and passes through said second magnitude of voltage of said the 6th resistance (R6) input;
The 7th resistance (R7) is connected to the negative input of said second operational amplifier (U2) and the output terminal of said second operational amplifier (U2).
5. a ground wire monitoring system is characterized in that, comprises ground wire observation circuit and warning circuit, wherein,
Said ground wire observation circuit is each described ground wire observation circuit in the claim 1 to 4;
Said warning circuit is connected to the output terminal of said ground wire observation circuit, is used for reporting to the police according to the monitoring result of said ground wire.
6. ground wire monitoring system according to claim 5 is characterized in that, in the monitoring result of said ground wire during greater than the driving voltage of said warning circuit, said warning circuit produces light through pilot lamp and reports to the police and/or produce acoustic alarm through hummer.
7. according to claim 5 or 6 described ground wire monitoring systems, it is characterized in that said ground wire monitoring system also comprises voltage conversion circuit, be used for the 220V voltage transitions is become the required voltage of said ground wire observation circuit.
8. a ground wire monitoring system is characterized in that, comprises ground wire observation circuit and communication module, wherein,
Said ground wire observation circuit is each described ground wire observation circuit in the claim 1 to 4;
Said communication module is connected to the output terminal of said ground wire observation circuit, is used for the monitoring result of said ground wire is transferred to the user.
9. ground wire monitoring system according to claim 9 is characterized in that, said communication module comprises:
Voltage comparator is connected to the output terminal of said ground wire observation circuit, is used for converting the monitoring result of said ground wire to voltage signal that single-chip microcomputer can be gathered;
Single-chip microcomputer is connected to said voltage comparator, is used to gather said voltage signal;
485 change 232 communication modules, are connected to said single-chip microcomputer, and being used for converting said voltage signal to host computer can identified signal, and is transferred to said host computer.
10. according to Claim 8 or 9 described ground wire monitoring systems, it is characterized in that said ground wire monitoring system also comprises voltage conversion circuit, be used for the 220V voltage transitions is become said ground wire observation circuit and the required voltage of said communication module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201851801U CN202522657U (en) | 2012-04-26 | 2012-04-26 | Ground wire monitoring circuit and system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201851801U CN202522657U (en) | 2012-04-26 | 2012-04-26 | Ground wire monitoring circuit and system |
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| CN202522657U true CN202522657U (en) | 2012-11-07 |
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| CN2012201851801U Expired - Lifetime CN202522657U (en) | 2012-04-26 | 2012-04-26 | Ground wire monitoring circuit and system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103353567A (en) * | 2013-06-14 | 2013-10-16 | 苏州天华超净科技股份有限公司 | Online monitor for ESD grounding system |
| CN104393677A (en) * | 2014-11-25 | 2015-03-04 | 国家电网公司 | System and method for centralized management on earth wires |
| CN103376383B (en) * | 2012-04-26 | 2016-03-02 | 珠海格力电器股份有限公司 | Ground wire monitoring circuit and system |
-
2012
- 2012-04-26 CN CN2012201851801U patent/CN202522657U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103376383B (en) * | 2012-04-26 | 2016-03-02 | 珠海格力电器股份有限公司 | Ground wire monitoring circuit and system |
| CN103353567A (en) * | 2013-06-14 | 2013-10-16 | 苏州天华超净科技股份有限公司 | Online monitor for ESD grounding system |
| CN104393677A (en) * | 2014-11-25 | 2015-03-04 | 国家电网公司 | System and method for centralized management on earth wires |
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Granted publication date: 20121107 Effective date of abandoning: 20160302 |
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