CN201965170U - Voltage and current acquisition device - Google Patents
Voltage and current acquisition device Download PDFInfo
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- CN201965170U CN201965170U CN2011200262754U CN201120026275U CN201965170U CN 201965170 U CN201965170 U CN 201965170U CN 2011200262754 U CN2011200262754 U CN 2011200262754U CN 201120026275 U CN201120026275 U CN 201120026275U CN 201965170 U CN201965170 U CN 201965170U
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Abstract
The utility model relates to a voltage and current acquisition device which comprises a voltage and current acquisition system and a hose; the voltage and current acquisition system comprises a current signal module, a voltage signal module, an isolation chip, an analog control switch, a high-precision acquisition chip and a central processing unit (CPU) which are sequentially connected, and a temperature probe; the input end of the temperature probe is connected with the input end of the high-precision acquisition chip; the current signal module is connected with the voltage signal module through a shunt; the voltage signal module is a resistance voltage dividing network; and the output end of the CPU is connected with the input end of the hose through an RS485 bus mechanism. The voltage and current acquisition device samples direct current voltage and current with high precision and has strong anti-interference performance.
Description
Technical field
The utility model relates to a kind of electric current and voltage harvester, is specifically related to a kind of transformer station station electric current and voltage harvester.
Technical background
Widespread use along with multiplexe electric technology, the transformer station station requires also accordingly more and more higher to the power supply combination property with direct supply, stand with the several important remote measurement analog quantitys of direct supply at present to closing female voltage, controlling voltage, close mother current, the control mother current, battery voltage, battery current, positive bus-bar insulation resistance to earth, negative busbar insulation resistance to earth, thus the quality of above-mentioned analog acquisition performance has been determined the performance of whole straight-flow system, and determine that the topmost factor of performance is an acquisition precision.Traditional voltage, electric current utilization are isolated amplifier and are realized high-low pressure electrical isolation and signal sampling, the weak signal of sampling is through linear amplification with after compensating, be converted to d. c. voltage signal, directly deliver to the distribution monitor box and handle, the voltage accuracy of Cai Jiing is low like this, interference is big.
The utility model content
Technical problem to be solved in the utility model is to provide a kind of dc voltage and current sampling with high precision at above-mentioned deficiency of the prior art, the electric current and voltage harvester of strong interference immunity.
In order to realize this purpose, the utility model has adopted following technical scheme:
A kind of electric current and voltage harvester, comprise electric current and voltage acquisition system and main frame, described electric current and voltage acquisition system comprises current signal module, voltage signal module, isolating chip, simulation gauge tap, high precision collecting chip and the CPU that connects successively, also comprise temp probe, described temp probe input end is connected with high precision collecting chip input end, described current signal module is connected with the voltage signal module by shunt, described voltage signal module is a resistance pressure-dividing network, and described CPU output terminal is connected with the main frame input end by RS485 bus mechanism.
The resistance of described resistance pressure-dividing network is the high-precision metal film resistance, can reduce error, strengthens acquisition precision.
Described isolating chip is the integrated buffer circuit chip of following of PO07, because voltage ratio to be measured is bigger, the metering circuit sampled voltage is smaller, adds the integrated buffer circuit of following in circuit under test and metering circuit, the interference of getting rid of two circuit networks is effectively avoided the circuit interference.
Described high precision collecting chip is an ICL7135 high precision collecting chip, and this chip precision height, cost are low, functional good.
Described CPU is STC12C5A16AD CPU.
This use is novel when work, current signal converts voltage signal to by shunt, carry out voltage acquisition again, voltage analog signal is isolated voltage circuit to be measured and measuring voltage loop by isolating chip, suppressing circuit network disturbs, from 1 road to 2 tunnel circulation of simulation gauge tap is switched, electric current wherein to be measured carries out the primary voltage conversion, temp probe collecting temperature signal is input to ICL7135 high precision collecting chip, and also from 1 road to 2 road circle collection switching of ICL7135 high precision collecting chip, ICL7135 high precision collecting chip is gathered current value, magnitude of voltage and temperature value convert the digit pulse ripple to and are sent to STC12C5A16AD CPU, STC12C5A16AD CPU combines closely by high level collection and counter 1 and calculates the digit pulse ripple, and the pulsating wave number converts voltage to be measured to by special processing, electric current to be measured, temperature to be measured.STC12C5A16AD CPU receives by serial ports and interrupts, receive the bus data bag and deposit send buffer in, send buffer is processed processing, examine correct back voltage to be measured, electric current to be measured, temperature to be measured are sent to main frame, main frame is diagnosed collection voltage, electric current, temperature, the investigation potential safety hazard improves the security of system performance.
The utility model contrast prior art has following advantage:
The dc voltage and current sampling with high precision, strong interference immunity, communication can be returned in the time at 2MS, cooperates the real-time monitoring voltage of direct-current supervision device, electric current, temperature.
Description of drawings
Accompanying drawing 1 is a fundamental diagram of the present utility model
Embodiment
Referring now to accompanying drawing, further describe the utility model.
As shown in Figure 1, a kind of electric current and voltage harvester comprises electric current and voltage acquisition system 10 and main frame 2.
Electric current and voltage acquisition system 10 comprises current signal module 11, voltage signal module 12, isolating chip 13, simulation gauge tap 14, high precision collecting chip 15 and the CPU16 that connects successively, also comprise temp probe 17, described temp probe 17 input ends are connected with high precision collecting chip 15 input ends, and current signal module 11 is connected with voltage signal module 12 by shunt.
Voltage signal module 12 is a resistance pressure-dividing network, the resistance of resistance pressure-dividing network is the high-precision metal film resistance, can reduce error, strengthens acquisition precision, battery acquisition channel resistance pressure-dividing network adopts 0.1% high-precision metal film resistance, temperature float coefficient be 30ppm (ppm promptly 1,000,000 it ...).When gathering voltage is (300V), and when divider resistance is maximum (39K Ω), dividing potential drop error maximum: the resistance temperature is floated dividing potential drop maximum error V=300 * 30 * 10
-6* 39 * 10
3/ 39 * 10
3=0.36 * 10
-3=9mv
Because the linear relationship of voltage, electric current, the resistance temperature is floated electric current maximum error: Imax=V/R=9mv/39 * 10
3=0.15uA
B. leakage current error:
Analog switch control leakage current generating error: simulation gauge tap maximum leakage current 0.1uA, leakage current forms error through divider resistance, and is as follows:
Vmax＝Rmax×Imax＝39×10
3×0.1uA＝3.9mv
Imax＝V/R＝3.9mv/39×10
3＝0.1uA
Comprehensively above-mentioned:
The voltage acquisition maximum error is (9mv)+(3.9mv)=12.9mv, has realized the voltage high precision collecting.
The current acquisition maximum error is (0.15uA)+(0.1uA)=0.25uA, has realized the electric current high precision collecting.
Isolating chip 13 is the integrated buffer circuit chip of following of PO07, because voltage ratio to be measured is bigger, the metering circuit sampled voltage is smaller, adds the integrated buffer circuit of following in circuit under test and metering circuit, the interference of getting rid of two circuit networks is effectively avoided the circuit interference.
High precision collecting chip 15 is an ICL7135 high precision collecting chip, and this chip precision height, cost are low, functional good, and the drift of gathering voltage versus temperature is 1 μ V/oC, and the voltage acquisition minimum resolution is 0.1mv, so Acquisition Error is 0 substantially.
Use outside reference source 220V voltage, 0.2A electric current that the collection value is revised, eliminate resistance error and device connecting wire error, V1=a * V2, V1 is for treating measured value 220V, V2 is the actual acquisition value, a=V1/V2 for example: the actual acquisition value is 221, by being multiplied by the coefficient correction to treating measured value.Current signal converts voltage signal to by shunt, carry out voltage acquisition again, voltage analog signal is isolated voltage circuit to be measured and measuring voltage loop by isolating chip 13, suppressing circuit network disturbs, from 1 road to 2 tunnel circulation of simulation gauge tap is switched, electric current wherein to be measured carries out the primary voltage conversion, temp probe collecting temperature signal is input to ICL7135 high precision collecting chip, and also from 1 road to 2 road circle collection switching of ICL7135 high precision collecting chip, ICL7135 high precision collecting chip is gathered current value, magnitude of voltage and temperature value convert the digit pulse ripple to and are sent to STC12C5A16AD CPU 16, STC12C5A16AD CPU 16 combines closely by high level collection and counter 1 and calculates the digit pulse ripple, the pulsating wave number converts voltage to be measured to by special processing, electric current to be measured, temperature to be measured.STC12C5A16AD CPU16 receives by serial ports and interrupts, receive the bus data bag and deposit send buffer in, send buffer is processed processing, examine correct back voltage to be measured, electric current to be measured, temperature to be measured are sent to main frame 2,2 pairs of batteries collections of main frame voltage, electric current, temperature are diagnosed, the investigation potential safety hazard improves the security of system performance.
The electric current and voltage acquisition system realizes that three tunnel collections are voltage acquisition, current acquisition, temperature acquisition, the device type of system is set simultaneously voluntarily, i.e. instrument and meter type, acquisition module type, wherein instrument and meter can be arranged to independent voltage table, reometer, thermometer.
Current acquisition can realize that many gears range is many kinds of electric current gears of 5A 10A 15A 20A 30A 50A 75A 100A 125A 150A200A 250A 300A 400A 500A 600A 750A 800A 1000A 1250A 1500A 2000A 2500A3000A 4000A.
Above-described the utility model embodiment does not constitute the qualification to the utility model protection domain.Any modification of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the claim protection domain of the present utility model.
Claims (5)
1. electric current and voltage harvester, comprise electric current and voltage acquisition system and main frame, it is characterized in that: described electric current and voltage acquisition system comprises the current signal module that connects successively, the voltage signal module, isolating chip, the simulation gauge tap, high precision collecting chip and CPU, also comprise temp probe, described temp probe input end is connected with high precision collecting chip input end, described current signal module is connected with the voltage signal module by shunt, described voltage signal module is a resistance pressure-dividing network, and described CPU output terminal is connected with the main frame input end by RS485 bus mechanism.
2. according to the described a kind of electric current and voltage harvester of claim 1, it is characterized in that the resistance of described resistance pressure-dividing network is the high-precision metal film resistance.
3. according to the described a kind of multichannel input battery logging of claim 1, it is characterized in that described isolating chip is the integrated buffer circuit chip of following of PO07.
4. according to the described a kind of multichannel input battery logging of claim 1, it is characterized in that described high precision collecting chip is an ICL7135 high precision collecting chip.
5. according to the described a kind of multichannel input battery logging of claim 1, it is characterized in that described CPU is STC12C5A16AD CPU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200262754U CN201965170U (en) | 2011-01-25 | 2011-01-25 | Voltage and current acquisition device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200262754U CN201965170U (en) | 2011-01-25 | 2011-01-25 | Voltage and current acquisition device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201965170U true CN201965170U (en) | 2011-09-07 |
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ID=44527716
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200262754U Expired - Fee Related CN201965170U (en) | 2011-01-25 | 2011-01-25 | Voltage and current acquisition device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201965170U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103543353A (en) * | 2013-09-24 | 2014-01-29 | 许继集团有限公司 | Direct-current sampling method in wide-temperature environment |
| CN109490615A (en) * | 2018-12-20 | 2019-03-19 | 中国航空工业集团公司西安飞机设计研究所 | The monitoring method and current collecting device of a kind of pair of airborne equipment electric current |
-
2011
- 2011-01-25 CN CN2011200262754U patent/CN201965170U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103543353A (en) * | 2013-09-24 | 2014-01-29 | 许继集团有限公司 | Direct-current sampling method in wide-temperature environment |
| CN103543353B (en) * | 2013-09-24 | 2016-04-13 | 许继集团有限公司 | Direct current acquisition method under a kind of wide temperature environment |
| CN109490615A (en) * | 2018-12-20 | 2019-03-19 | 中国航空工业集团公司西安飞机设计研究所 | The monitoring method and current collecting device of a kind of pair of airborne equipment electric current |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110907 Termination date: 20120125 |