CN202929099U - Bus shielding layer potential monitoring apparatus - Google Patents
Bus shielding layer potential monitoring apparatus Download PDFInfo
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- CN202929099U CN202929099U CN 201220646440 CN201220646440U CN202929099U CN 202929099 U CN202929099 U CN 202929099U CN 201220646440 CN201220646440 CN 201220646440 CN 201220646440 U CN201220646440 U CN 201220646440U CN 202929099 U CN202929099 U CN 202929099U
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- 238000012544 monitoring process Methods 0.000 title abstract description 12
- 238000012806 monitoring device Methods 0.000 claims description 22
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- 230000004224 protection Effects 0.000 claims description 4
- 238000012545 processing Methods 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 abstract 2
- 239000003990 capacitor Substances 0.000 description 15
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Abstract
Provided is a bus shielding layer potential monitoring apparatus, comprising a resistance voltage-dividing unit, an instrument amplifier unit, a programmable amplifier unit, a reference voltage unit, and an AD conversion unit, wherein the first end of the resistance voltage-dividing unit is connected to a bus shielding layer, comprises multiple serially connected resistors, and carries out voltage division of the bus shielding layer; the input terminal of the instrument amplifier unit is connected to the second terminal of the resistance voltage-dividing unit, and filters the voltage-dividing signals and carries out 1 time gaining for outputting; the input terminal of the programmable amplifier unit is connected to the output terminal of the instrument amplifier, and carries out 1-200 times of gaining processing of the signals output by the instrument amplifier unit for outputting; the reference voltage unit simultaneously provides bias voltage for the instrument amplifier unit and the programmable amplifier unit; and the AD conversion unit is connected to the output terminal of the programmable amplifier and transforms the output analog potential value into the digital potential value to facilitate the following control. The bus shielding layer potential monitoring apparatus can monitor the potential value between the shielding layer and the ground in a real-time manner, reduce the electromagnetic interference of the cable bus with the electronic devices, prevent the shielding layer from being burned, and avoid the maloperation of the electronic device and the like. The bus shielding layer potential monitoring apparatus of the utility model secures the safety of the related personnel and devices.
Description
Technical field
The utility model relates to a kind of potential monitoring device, particularly relates to a kind of bus shield layer potential monitoring device.
Background technology
Along with the expansion of electric system, the raising of electric pressure, the increase of unit capacity, the electronic equipments such as computing machine have been widely used in power plant's production monitoring and control.And the frequency band of electronic equipment is widened day by day, and power strengthens gradually, and sensitivity requires progressively to improve.The working environment of electronic equipment and monitoring target itself are exactly a very strong alternating electromagnetic field, are large interference sources.In such electromagnetic environment, electronic installation will inevitably be subject to the electromagnetic interference (EMI) that the interference voltage that electrostatic induction, electromagnetic coupled, ground wire potential rise, control loop self produce etc. causes, these electromagnetic interference (EMI) can cause that gently the reliability of electronic installation reduces, and are heavy cause equipment normally not move.
And in the electric power transfer process, cable is exactly main interference source, and it is the main generator of interference, is also main receiver.Cable is as generator, to the space radiation electromagnetic noise; As absorber, can receive sensitively the electromagnetic noise of launching from the near-by interference source.
In order effectively to improve the anti-electromagnetic interference capability of power transmission system and other signal transduction system, guarantee electronic equipment reliability service under complex electromagnetic environment of being attached thereto, often use the cable bus with screen layer, the cable bus innermost layer is the conduction cable core, conduction cable core skin is insulation course, is screen layer outside insulation course.Cable master heart yearn provides electric current, and outside main heart yearn, screen layer needs to connect with ground is reliable, and screen layer and main heart yearn are insulated from each other.Shielding layer grounding has guaranteed that screen layer and the earth at same current potential, have reduced electromagnetic interference (EMI), can also guarantee related personnel's life and device security when meeting accident touching.
But it is inadequate relying on merely cable shield, because the shielding layer grounding of cable bus, when ground connection went wrong, earth point resistance will become greatly, thereby made screen layer not in zero potential; Entail dangers to related personnel's life security when accident is touched; When occurring short-circuit current or thunder-strike current on grounded screen, the current potential of each earth point of screen layer is different, makes current flowing in screen layer, may cause screen layer to burn; When in screen layer during current flowing, will produce undesired signal to each heart yearn, the screen layer electric current produces to disturb to heart yearn and might make apparatus generation malfunction.
The heavy-current bus-bars screen layer need to have good protection and insulation measures, guarantees screen layer and the earth equipotential, on the one hand, can reduce cable bus self to the electromagnetic interference (EMI) of electronic equipment, guarantees the reliability service of electronic equipment; On the other hand, also guaranteed the safety of related personnel's life and equipment.Therefore, need to carry out Real-Time Monitoring and control to bus shield layer current potential.
The utility model content
The shortcoming of prior art in view of the above, the purpose of this utility model is to provide a kind of bus shield layer potential monitoring device, be used for Real-Time Monitoring cable bus screen layer current potential, when solving the bus shield layer as non zero potential cable bus to electromagnetic interference (EMI), the screen layer of electronic equipment burn, the problem such as related personnel's life and device security are affected.
Reach for achieving the above object other relevant purposes, the utility model provides a kind of bus shield layer potential monitoring device, be connected in the bus shield layer, measure the current potential of described bus shield layer, described screen layer potential monitoring device comprises at least: the electric resistance partial pressure unit, its first end is connected in described bus shield layer, comprises the resistance of a plurality of series connection, exports after the voltage dividing potential drop with described bus shield layer; Instrument amplifier unit, its input end are connected in the second end of described electric resistance partial pressure unit, and the electric potential signal that gathers after described electric resistance partial pressure unit dividing potential drop is carried out exporting after filtering protection and 1 times of gain process; The programmable amplifier unit, its input end is connected in the output terminal of described instrument amplifier, and the electric potential signal of described instrument amplifier unit output is carried out exporting after 1 ~ 200 times of gain process; Reference voltage unit is connected with the programmable amplifier unit with described instrument amplifier unit simultaneously, and bias voltage is provided for it; The AD converting unit is connected in the output terminal of described programmable amplifier, and the analog electrical place value that described programmable amplifier unit is exported after gain process is converted to digital potential value.
Preferably; described instrument amplifier unit is comprised of signal filtering protected location and instrument amplifier; described signal filtering protected location is comprised of a plurality of resistance, Transient Voltage Suppressor; input end is connected with described electric resistance partial pressure unit; output terminal is connected with described instrument amplifier, and provides bipolar difference input for it.
Preferably, the twin-stage differential input signal that the described signal filtering protected location of described instrument amplifier input end access provides, output terminal connect an external resistor and are connected with described programmable amplifier unit, and a port is connected with described reference voltage unit in addition.
Preferably, described programmable amplifier unit is comprised of a plurality of resistance, electric capacity and programmable amplifier, the input end input is from the electric potential signal of described instrument amplifier unit output, and output terminal is connected with described AD converting unit, also has a port to be connected with described reference voltage unit.
As mentioned above, bus shield layer potential monitoring device described in the utility model has following beneficial effect:
1, realized the Real-Time Monitoring of bus shield layer current potential;
2, reduced the electromagnetic interference (EMI) of cable bus to electronic installation;
3, equipment reliability of operation and security have been improved;
4, guaranteed the safety of related personnel's life and property.
Description of drawings
Fig. 1 is shown as the structural representation of the utility model bus shield layer potential monitoring device always to scheme.
Fig. 2 is shown as electric resistance partial pressure unit and the instrument amplifier cellular construction schematic diagram of the utility model bus shield layer potential monitoring device.
Fig. 3 is shown as the programmable amplifier cellular construction schematic diagram of the utility model bus shield layer potential monitoring device.
Fig. 4 is shown as the reference voltage unit structural representation of the utility model bus shield layer potential monitoring device.
Embodiment
Below by specific instantiation explanation embodiment of the present utility model, those skilled in the art can understand other advantages of the present utility model and effect easily by the disclosed content of this instructions.The utility model can also be implemented or be used by other different embodiment, and the every details in this instructions also can be based on different viewpoints and application, carries out various modifications or change under spirit of the present utility model not deviating from.
The utility model provides a kind of bus shield layer potential monitoring device, be used for Real-Time Monitoring cable bus screen layer current potential, when solving the bus shield layer as non zero potential cable bus to electromagnetic interference (EMI), the screen layer of electronic equipment burn, the problem such as related personnel's life and device security are affected.Below will elaborate principle and the embodiment of a kind of bus shield layer potential monitoring device of the present utility model, and make those skilled in the art not need creative work can understand a kind of bus shield layer of the utility model potential monitoring device.
Need to prove, the diagram that provides in the present embodiment only illustrates basic conception of the present utility model in a schematic way, satisfy only show in graphic with the utility model in relevant assembly but not component count, shape and size drafting when implementing according to reality, during its actual enforcement, kenel, quantity and the ratio of each assembly can be a kind of random change, and its assembly layout kenel also may be more complicated.
See also Fig. 1, bus shield layer potential monitoring device of the present utility model is comprised of electric resistance partial pressure unit 21, instrument amplifier unit 22, programmable amplifier unit 23, reference voltage unit 24 and AD converting unit 25.
See also Fig. 2, in the present embodiment, described electric resistance partial pressure unit 21 first ends are connected in described bus shield layer 1, comprise the high precision 20M Ω resistance of 10 series connection, export after voltage dividing potential drop with described bus shield layer 1, output terminal i.e. the second end is connected with instrument amplifier unit 22.If the current potential of bus shield layer 1 is at 0 ~ 200V, after dividing potential drop, the current potential of instrument amplifier unit 22 input ends is reduced to 0 ~ 4V.
In the present embodiment, described instrument amplifier unit 22 is comprised of signal filtering protected location 221 and instrument amplifier 222.Described signal filtering protected location 221 is comprised of 7 resistance R 1 ~ R7,2 Transient Voltage Suppressor TVS1 and TVS2; described signal filtering protected location 221 1 ends are connected with described electric resistance partial pressure unit 21; the electric potential signal that will obtain after described electric resistance partial pressure unit 21 dividing potential drops carries out filtering; the other end is connected with described instrument amplifier 222, and provides bipolar difference input for it.
In described signal filtering protected location 221, resistance R 1 first end is connected with described electric resistance partial pressure unit 21 output terminals, the second end ground connection; Resistance R 2 first ends are connected with resistance R 1 first end, are connected to equally described electric resistance partial pressure unit 21 output terminals, and described resistance R 2 second ends are connected with resistance R 3 first ends and Transient Voltage Suppressor TVS2 first end; Described resistance R 3 second ends are connected with resistance R 6 first ends, simultaneously also as the electrode input end of described instrument amplifier 222; Resistance R 4 first ends are connected with resistance R 1 second end and ground connection, and described resistance R 4 second ends are connected with resistance R 5 first ends and Transient Voltage Suppressor TVS1 first end; Described Transient Voltage Suppressor TVS1 the second end ground connection is formed in parallel by capacitor C 1 and voltage stabilizing diode ZD1, and voltage stabilizing diode ZD1 negative pole is connected in resistance R 4 second ends and capacitor C 1 first end, positive pole and the ground connection that is connected with capacitor C 1 second end; Described Transient Voltage Suppressor TVS2 is formed in parallel by capacitor C 2 and voltage stabilizing diode ZD2, and voltage stabilizing diode ZD2 negative pole is connected in resistance R 2 second ends and capacitor C 2 first ends, the anodal ground connection that is connected with capacitor C 2 second ends; In the present embodiment, described voltage stabilizing diode ZD1 and ZD2 adopt the TVS-P6KE10CA Transient Suppression Diode; Described resistance R 6 first ends are connected with described resistance R 3 second ends, described resistance R 6 second end ground connection; Described resistance R 5 first ends are connected with described resistance R 4 second ends, and the second end is connected with resistance R 7 first ends, simultaneously also as the negative input of described instrument amplifier 222; In the present embodiment, described capacitor C 1, C2, voltage stabilizing diode ZD1, ZD2, the second end ground connection of resistance R 6, R7.
In the present embodiment, described instrument amplifier 222 adopts the AD620 amplifier, has 8 pins, and wherein pin 3 is connected with described resistance R 3 second ends, the anodal input of access; Pin 2 is connected with described resistance R 5 second ends, the input of access negative pole; Pin 1 and pin 8 are the gain end; Pin 4 is connected with pin and is connected power supply; Pin 5 is connected with described reference voltage unit 24, is connected in simultaneously described programmable amplifier unit 23; Pin 6 is output terminal, connects an external resistor R8, will carry out exporting after 1 times of gain process through the filtered electric potential signal of described signal filtering protected location 221.Described resistance R 8 other ends are connected with described programmable amplifier unit 23.
See also Fig. 3, in the present embodiment, the programmable amplifier 231 of described programmable amplifier unit adopts PGA113 type gain amplifiers, has 10 pins, and pin 1 connects operating voltage, is connected with capacitor C 4 one ends, described capacitor C 4 other end ground connection; Pin 10 connection circuit voltages are connected with capacitor C 5 one ends, described capacitor C 5 other end ground connection; Pin 6 ground connection; Pin 2 is connected in resistance R 8, introduces the electric potential signal after the unit 22 filtering protections of described instrument amplifier and 1 times of gain process; Pin 3 is vacant; Pin 7,8,9 is contact resistance R11, R12, R13 one end respectively, and the other end of described resistance R 11, R12, R13 is connected with single-chip microcomputer, is used for single-chip microcomputer and further system is controlled; The output potential signal of described programmable amplifier 231 is through pin 5 outputs, and described pin 5 is connected with resistance R 14 1 ends, described resistance R 14 another termination capacitor C 6 first ends, and be connected with described AD converting unit 25 input ends; Described capacitor C 6 second end ground connection.
See also Fig. 4, in the present embodiment, described reference voltage unit 24 is comprised of a MCP1541 reference voltage source, two resistance R 9, R10 and capacitor C 3.described MCP1541 reference voltage source pin 1 ground connection, pin 2 output reference voltage 4.096V, pin 3 meets input voltage 5V, described pin 2 is connected with described resistance R 9 first ends, described resistance R 9 second ends are connected with described resistance R 10 first ends, described resistance R 10 second end ground connection, described capacitor C 3 second end ground connection, first end and described resistance R 9 second ends, described resistance R 10 first ends are connected to same point, this is connected with the pin 4 of described programmable amplifier 231 and the pin 5 of described instrument amplifier 222, voltage is 2.0V, and with its bias voltage as described programmable amplifier 231 and described instrument amplifier 222.
The electric potential signal of described instrument amplifier unit 22 output 23 carries out exporting after 1 ~ 200 times of gain process through described programmable amplifier unit, through AD converting unit 25, the analog voltages of output is converted to digital potential value, becomes the reliable signal of potential measurement.
In the present embodiment, resistance R 1 resistance value is 4M Ω, and the resistance value of resistance R 2, R3, R4, R5, R9, R10 is 10K Ω, and the resistance value of R6, R7 is 1M Ω, and other resistance values are determined according to actual conditions.
In sum, in bus shield layer potential monitoring process, the screen layer current potential is at 0V ~ 200V, when the screen layer current potential surpasses ground potential more than 0V, should first carry out voltage division processing to voltage, after the electric resistance partial pressure unit of the utility model bus shield layer potential monitoring device dividing potential drop, current potential is down to 0V ~ 4V.The weak output signal that gather this moment and be mixed with much noise can't be directly used in analysiss, control, through described instrument amplifier unit, it is carried out that filtering is protected and 1 times of gain process after export, removed signal noise, strengthened signal energy.After carrying out 1 ~ 200 times of gain process to signal, the programmable amplifier unit further strengthens again signal amplitude and energy, through the AD converting unit, the analog electrical place value of exporting is converted to digital potential value, guarantees that the electric potential signal that collects becomes the available signal of potential monitoring.Monitoring device by the utility model bus shield layer electric potential signal carries out acquisition and processing to the screen layer current potential, can be used for next step control, guarantee screen layer and the earth equipotential, reduced the electromagnetic interference (EMI) of cable bus to electronic equipment, avoided screen layer to burn, the generation of the situations such as electronic equipment malfunction has guaranteed the safety of related personnel's life and property.
Above-described embodiment is illustrative principle of the present utility model and effect thereof only, but not is used for restriction the utility model.Any person skilled in the art scholar all can under spirit of the present utility model and category, modify or change above-described embodiment.Therefore, have in technical field under such as and know that usually the knowledgeable modifies or changes not breaking away from all equivalences of completing under spirit that the utility model discloses and technological thought, must be contained by claim of the present utility model.
Claims (4)
1. a bus shield layer potential monitoring device, be connected in the current potential that the bus shield layer is monitored described bus shield layer, it is characterized in that, described screen layer potential monitoring device comprises at least:
Electric resistance partial pressure unit, its first end are connected in described bus shield layer, comprise the resistance of a plurality of series connection, and the voltage of described bus shield layer is carried out dividing potential drop;
Instrument amplifier unit, its input end are connected in the second end of described electric resistance partial pressure unit, and the electric potential signal that obtains after described electric resistance partial pressure unit dividing potential drop is carried out exporting after filtering protection and 1 times of gain process;
The programmable amplifier unit, its input end is connected in the output terminal of described instrument amplifier unit, and the electric potential signal of described instrument amplifier unit output is carried out exporting after 1 ~ 200 times of gain process;
Reference voltage unit is connected with the programmable amplifier unit with described instrument amplifier unit simultaneously, and bias voltage is provided for it;
The AD converting unit is connected in the output terminal of described programmable amplifier, and the analog electrical place value that described programmable amplifier unit is exported after gain process is converted to digital potential value.
2. bus shield layer potential monitoring device according to claim 1; it is characterized in that: described instrument amplifier unit is comprised of signal filtering protected location and instrument amplifier; described signal filtering protected location is comprised of a plurality of resistance, Transient Voltage Suppressor; input end is connected with described electric resistance partial pressure unit; output terminal is connected with described instrument amplifier, and provides bipolar difference input for it.
3. bus shield layer potential monitoring device according to claim 2; it is characterized in that: the twin-stage differential input signal that the described signal filtering protected location of described instrument amplifier input end access provides; output terminal connects an external resistor and is connected with described programmable amplifier unit, and a port is connected with described reference voltage unit in addition.
4. bus shield layer potential monitoring device according to claim 1, it is characterized in that: described programmable amplifier unit is comprised of a plurality of resistance, electric capacity and programmable amplifier, the input end input is from the electric potential signal of described instrument amplifier unit output, output terminal is connected with described AD converting unit, also has a port to be connected with described reference voltage unit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220646440 CN202929099U (en) | 2012-11-29 | 2012-11-29 | Bus shielding layer potential monitoring apparatus |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220646440 CN202929099U (en) | 2012-11-29 | 2012-11-29 | Bus shielding layer potential monitoring apparatus |
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| CN202929099U true CN202929099U (en) | 2013-05-08 |
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| CN 201220646440 Expired - Fee Related CN202929099U (en) | 2012-11-29 | 2012-11-29 | Bus shielding layer potential monitoring apparatus |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103698589A (en) * | 2013-11-28 | 2014-04-02 | 兰州空间技术物理研究所 | Satellite surface potential monitoring device |
| CN103852629A (en) * | 2012-11-29 | 2014-06-11 | 山东电力集团公司济宁供电公司 | Bus shielding layer potential monitoring device |
-
2012
- 2012-11-29 CN CN 201220646440 patent/CN202929099U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103852629A (en) * | 2012-11-29 | 2014-06-11 | 山东电力集团公司济宁供电公司 | Bus shielding layer potential monitoring device |
| CN103852629B (en) * | 2012-11-29 | 2016-04-27 | 山东电力集团公司济宁供电公司 | A kind of bus shield layer potential monitoring system |
| CN103698589A (en) * | 2013-11-28 | 2014-04-02 | 兰州空间技术物理研究所 | Satellite surface potential monitoring device |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130508 Termination date: 20151129 |