CN100549702C - Supply voltage and electric bridge voltage sample circuit structure - Google Patents
Supply voltage and electric bridge voltage sample circuit structure Download PDFInfo
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- CN100549702C CN100549702C CNB2007101912527A CN200710191252A CN100549702C CN 100549702 C CN100549702 C CN 100549702C CN B2007101912527 A CNB2007101912527 A CN B2007101912527A CN 200710191252 A CN200710191252 A CN 200710191252A CN 100549702 C CN100549702 C CN 100549702C
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- 238000005070 sampling Methods 0.000 claims abstract description 31
- 238000006243 chemical reaction Methods 0.000 claims abstract description 11
- 238000005259 measurement Methods 0.000 claims abstract description 9
- 230000009466 transformation Effects 0.000 claims abstract description 4
- 238000002955 isolation Methods 0.000 abstract description 8
- 239000012530 fluid Substances 0.000 abstract description 2
- 238000012544 monitoring process Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
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Abstract
The present invention relates to isolation, high precision, the great dynamic range voltage sample circuit structure of a kind of 220V electric pressure power supply and bridge voltage, feature is to adopt second contact of first contact to the, three relays of first sample resistance to the, nine sample resistances and first relay, and first, second, third bridge resistor, composition supply voltage and electric bridge voltage sample circuit.A/D change-over circuit three road lead-out terminals, positive source sampling voltage, second bridge resistor sampling voltage, power cathode sampling voltage over the ground over the ground over the ground, deliver to the A/D analog to digital conversion circuit, by the A/D analog to digital conversion circuit transformation result with binary data, send and handle in the computing machine and store, finish measurement.The present invention can satisfy the occasion demand of different electric pressure isolation, high precision, the measurement of great dynamic range plurality of voltages; Owing to adopt each sampling voltage to output to the A/D analog to digital conversion circuit separately, isolate easily and realize that it is little to interact, for fluid drive provides convenience.
Description
Technical field
The present invention relates to isolation, high precision, the great dynamic range voltage sample circuit structure of a kind of 220V electric pressure power supply and bridge voltage, specifically be used for the online high speed of high sensitivity straight-flow system insulation monitoring and warning devices such as transformer station or generating plant measure the active and standby supply voltage of 220V straight-flow system, total loop electric bridge voltage and each minute the loop electric bridge voltage.
Background technology
At present, carry out insulating monitoring in the known straight-flow system insulation monitoring and warning device and all will carry out voltage measurement with searching earth fault, the resistive arm of a wherein useful electric bridge changes the dc measurement of little main electric bridge, measures the method for the stake resistance of total DC loop.In order not only to measure the stake resistance of total DC loop, also want the stake resistance of each duplexure of energy measurement, two resistive arms all adjustable and dynamic range and precision and the high voltage circuit that need electric bridge to taking a sample, and the isolation between the A/D analog to digital conversion circuit is had higher requirement.
The production scene is badly in need of when straight-flow system is normally moved, and the voltage that should be able to change accurate electric bridge to active and standby supply voltage and active and standby two resistive arms of straight-flow system is measured; And active and standby supply voltage and active and standby bridge voltage will have the mutual isolation features of megaohm resistance.Present general sample circuit all can not satisfy active and standby power supply and active and standby electric bridge isolation, high precision, great dynamic range are taken a sample automatically.
Summary of the invention
The objective of the invention is to overcome above-mentioned weak point, thereby a kind of supply voltage and electric bridge voltage sample circuit structure are provided, can produce and satisfy active and standby power supply and active and standby electric bridge isolation, high precision, great dynamic range are taken a sample automatically.
Main solution of the present invention is achieved in that
Supply voltage of the present invention and electric bridge voltage sample circuit components and parts annexation are as follows:
The first contact J1-1 series connection of the first sample resistance RQ1 and first relay, one terminates at a QY1 tie point, and the other end is connected on the 2nd QY2 tie point; The second contact J1-2 series connection of the second sample resistance RQ2 and first relay, one terminates at the 2nd QY2 tie point, and the other end is connected on the ground potential GND point; The 3rd sample resistance RQ3 one terminates at the 2nd QY2 tie point, and the other end the sampling voltage on the positive source, is delivered to an A/D input end SR1 of A/D change-over circuit by the 7th QY7 tie point; The first bridge resistor Rz1 one terminates at a QY1 tie point, and the other end is connected on the 3rd QY3 tie point; The first contact J2-1 series connection of the second bridge resistor Rz2 and second relay, one terminates at the 3rd QY3 tie point, and the other end is connected on the ground potential GND point; The 4th sample resistance RQ4 and second relay, second contact J2-2 series connection, one terminates at the 3rd QY3 tie point, and the other end is connected on the 4th QY4 tie point; The 5th sample resistance RQ5 one terminates at the 4th QY4 tie point, and the other end is connected on the ground potential GND point; The 6th sample resistance RQ6 one terminates at the 4th QY4 tie point, and the other end the sampling voltage on the second bridge resistor Rz2, is delivered to the 2nd A/D input end SR2 of A/D change-over circuit by the 8th QY8 tie point; The 3rd bridge resistor Rz3 one terminates at the 3rd QY3 tie point, and the other end is connected on the 5th QY5 tie point; The first contact J3-1 series connection of the 7th sample resistance RQ7 and the 3rd relay, one terminates at the 5th QY5 tie point, and the other end is connected on the 6th QY6 tie point; The 8th sample resistance RQ8 and the 3rd relay second contact J3-2 series connection, one terminates at the 6th QY6 tie point, and the other end is connected on the ground potential GND point; The 9th sample resistance RQ9 one terminates at the 6th QY6 tie point, and the other end is delivered to the sampling voltage on the power cathode the 3rd A/D input end SR3 of A/D change-over circuit by the 9th QY9 tie point; The 3rd A/D input end SR3 three road lead-out terminals of the one A/D input end SR1 of described A/D change-over circuit, the 2nd A/D input end SR2 of A/D change-over circuit, A/D change-over circuit, positive source sampling voltage, second bridge resistor Rz2 sampling voltage, power cathode sampling voltage over the ground over the ground over the ground, deliver to the A/D analog to digital conversion circuit, by the A/D analog to digital conversion circuit transformation result with binary data, send and handle in the computing machine and store, finish measurement.
Compared with the prior art the present invention has the following advantages:
The present invention is simple, compact and reasonable for structure; Can satisfy the occasion demand of different electric pressure isolation, high precision, the measurement of great dynamic range plurality of voltages; Owing to adopt each sampling voltage to output to the A/D analog to digital conversion circuit separately, isolate easily and realize that it is little to interact, for fluid drive provides convenience.
Description of drawings
Fig. 1 is components and parts catenation principle figure of the present invention.
Embodiment
Following the present invention will be in conjunction with the accompanying drawings embodiment in 1 be further described:
The present invention mainly adopts power source for relay control sampling and electric bridge voltage sample circuit, by an A/D input end SR1 of described A/D change-over circuit, the 2nd A/D input end SR2 of A/D change-over circuit, the 3rd A/D input end SR3 three road lead-out terminals of A/D change-over circuit, to positive source sampling voltage, Rz2 resistance sampling voltage, power cathode sampling voltage over the ground over the ground over the ground, deliver to the A/D analog to digital conversion circuit.By the A/D analog to digital conversion circuit, transformation result sent with binary data handle in the computing machine and store, finish measurement.When this circuit is used for primary power and main electric bridge, just measure the voltage of primary power and main electric bridge, when this circuit is used for stand-by power source and power backup bridge, just measure the voltage of stand-by power source and power backup bridge.
As shown in Figure 1: supply voltage and electric bridge voltage sample circuit components and parts annexation are as follows:
The second contact J3-2 of the first contact J1-1 to the, three relays of the first sample resistance RQ1 to the, the nine sample resistance RQ9 and first relay, and first, second, third bridge resistor Rz1, Rz2, Rz3 composition supply voltage and electric bridge voltage sample circuit.The first contact J1-1 series connection of the first sample resistance RQ1 and first relay, one terminates at a QY1 tie point, and the other end is connected on the 2nd QY2 tie point.The second contact J1-2 series connection of the second sample resistance RQ2 and first relay, one terminates at the 2nd QY2 tie point, and the other end is connected on the ground potential GND point.The 3rd sample resistance RQ3 one terminates at the 2nd QY2 tie point, and the other end the sampling voltage on the positive source, is delivered to an A/D input end SR1 of A/D change-over circuit by the 7th QY7 tie point.The first bridge resistor Rz1 one terminates at a QY1 tie point, and the other end is connected on the 3rd QY3 tie point.The first contact J2-1 series connection of the second bridge resistor Rz2 and second relay, one terminates at the 3rd QY3 tie point, and the other end is connected on the ground potential GND point.The 4th sample resistance RQ4 and second relay, second contact J2-2 series connection, one terminates at the 3rd QY3 tie point, and the other end is connected on the 4th QY4 tie point.The 5th sample resistance RQ5 one terminates at the 4th QY4 tie point, and the other end is connected on the ground potential points.The 6th sample resistance RQ6 one terminates at the 4th QY4 tie point, and the other end the sampling voltage on the second bridge resistor Rz2, is delivered to the 2nd A/D input end SR2 of A/D change-over circuit by the 8th QY8 tie point.The 3rd bridge resistor Rz3 one terminates at the 3rd QY3 tie point, and the other end is connected on the 5th QY5 tie point.The first contact J3-1 series connection of the 7th sample resistance RQ7 and the 3rd relay, one terminates at the 5th QY5 tie point, and the other end is connected on the 6th QY6 tie point.The 8th sample resistance RQ8 and the 3rd relay second contact J3-2 series connection, one terminates at the 6th QY6 tie point, and the other end is connected on the ground potential GND point.The 9th sample resistance RQ9 one terminates at the 6th QY6 tie point, and the other end is delivered to the sampling voltage on the power cathode the 3rd A/D input end SR3 of main A/D change-over circuit by the 9th QY9 tie point.Voltage on the first bridge resistor Rz1: the voltage that can deduct by the voltage on the positive source on the second bridge resistor Rz2 obtains.Voltage on the 3rd bridge resistor Rz3: the voltage that can deduct on the power cathode by the voltage on the second bridge resistor Rz2 obtains.
Principle of work of the present invention and course of action:
Computing machine is by relay J 1, J2, J3, sampling of control power supply and electric bridge voltage sample circuit, when J1 moves, 220V positive source voltage-to-ground is through RQ1 and RQ2 dividing potential drop, because more than the RQ1=1M Ω, below the RQ2=10k Ω, so the voltage that sampling voltage is delivered on the A/D input end SR1 has only below the 2.5V.When J2 moved, the voltage-to-ground on the second bridge resistor Rz2 was through RQ4 and RQ5 dividing potential drop, because more than the RQ4=1M Ω, below the RQ5=10k Ω, so the voltage that sampling voltage is delivered on the 2nd A/D input end SR2 has only below the 2.5V.When J3 moved, 220V power cathode voltage-to-ground was through RQ7 and RQ8 dividing potential drop, because more than the 2RQ7=1M Ω, below the RQ8=10k Ω, so the voltage that sampling voltage is delivered on the 3rd A/D input end SR3 has only below the 2.5V.
Recover the positive source voltage-to-ground, computing machine also will be taken advantage of (RQ1+RQ2)/RQ2 to A/D changing voltage result.Recover the power cathode voltage-to-ground, computing machine also will multiply by (RQ7+RQ8)/RQ8 to A/D changing voltage result.Recover the voltage-to-ground on the electric bridge Rz2, computing machine also will multiply by (RQ4+RQ5)/RQ5 to A/D changing voltage result.
Voltage on the first bridge resistor Rz1: the voltage that can deduct by the voltage on the positive source on the second bridge resistor Rz2 obtains.Voltage on the 3rd bridge resistor Rz3: the voltage that can deduct on the power cathode by the voltage on the second bridge resistor Rz2 obtains.
By the dividing potential drop of 1M Ω and 10k Ω sample resistance, the 220V forceful electric power just changes light current into to be handled, and the power supply of pilot relay and 220V forceful electric power all are to isolate mutually.Because the dynamic range of electric bridge first resistance R z1 and the 3rd resistance R z3 is bigger, change from 10 Ω～250000 Ω, again so the dynamic range of power supply and electric bridge sampling voltage is also bigger.Precision resistance is selected to be got because RQ1～RQ9 adopts again, so the precision height of sampling.Each sampling voltage all is to deliver to the A/D change-over circuit separately, so the influence mutually is also less.
When this circuit is used for primary power and main electric bridge, just primary power and main bridge voltage are taken a sample.When this circuit is used for stand-by power source and power backup bridge, just stand-by power source and power backup bridge voltage are taken a sample.
Claims (1)
1, a kind of supply voltage and electric bridge voltage sample circuit structure is characterized in that the components and parts annexation is as follows:
Adopt first contact (J1-1) series connection of first sample resistance (RQ1) and first relay, one terminates at first (QY1) tie point, and the other end is connected on second (QY2) tie point; Second contact (J1-2) series connection of second sample resistance (RQ2) and first relay, one terminates at second (QY2) tie point, and the other end is connected on earth potential (GND) point; The 3rd sample resistance (RQ3) one terminates at second (QY2) tie point, and the other end the sampling voltage on the positive source, is delivered to an A/D input end (SR1) of A/D change-over circuit by the 7th (QY7) tie point; First bridge resistor (Rz1) one terminates at first (QY1) tie point, and the other end is connected on the 3rd (QY3) tie point; First contact (J2-1) series connection of second bridge resistor (Rz2) and second relay, one terminates at the 3rd (QY3) tie point, and the other end is connected on earth potential (GND) point; The 4th sample resistance (RQ4) and second relay, second contact (J2-2) series connection, one terminates at the 3rd (QY3) tie point, and the other end is connected on the 4th (QY4) tie point; The 5th sample resistance (RQ5) one terminates at the 4th (QY4) tie point, and the other end is connected on earth potential (GND) point; The 6th sample resistance (RQ6) one terminates at the 4th (QY4) tie point, and the other end the sampling voltage on second bridge resistor (Rz2), is delivered to the 2nd A/D input end (SR2) of A/D change-over circuit by the 8th (QY8) tie point; The 3rd bridge resistor (Rz3) one terminates at the 3rd (QY3) tie point, and the other end is connected on the 5th (QY5) tie point; First contact (J3-1) series connection of the 7th sample resistance (RQ7) and the 3rd relay, one terminates at the 5th (QY5) tie point, and the other end is connected on the 6th (QY6) tie point; The 8th sample resistance (RQ8) and the 3rd relay second contact (J3-2) series connection, one terminates at the 6th (QY6) tie point, and the other end is connected on earth potential (GND) point; The 9th sample resistance (RQ9) one terminates at the 6th (QY6) tie point, and the other end is delivered to the sampling voltage on the power cathode the 3rd A/D input end (SR3) of A/D change-over circuit by the 9th (QY9) tie point; The 3rd A/D input end (SR3) three road lead-out terminals of the one A/D input end (SR1) of described A/D change-over circuit, the 2nd A/D input end (SR2) of A/D change-over circuit, A/D change-over circuit, positive source sampling voltage, second bridge resistor (Rz2) sampling voltage, power cathode sampling voltage over the ground over the ground over the ground, deliver to the A/D analog to digital conversion circuit, by the A/D analog to digital conversion circuit transformation result with binary data, send and handle in the computing machine and store, finish measurement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101912527A CN100549702C (en) | 2007-12-12 | 2007-12-12 | Supply voltage and electric bridge voltage sample circuit structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101912527A CN100549702C (en) | 2007-12-12 | 2007-12-12 | Supply voltage and electric bridge voltage sample circuit structure |
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| CN101178416A CN101178416A (en) | 2008-05-14 |
| CN100549702C true CN100549702C (en) | 2009-10-14 |
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| CN103018510B (en) * | 2012-07-10 | 2015-11-18 | 郭建国 | Isolation spi bus electric energy metering module and APLC ammeter thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3048745B2 (en) * | 1992-04-13 | 2000-06-05 | 三菱電機株式会社 | Analog input device |
| EP0827266B1 (en) * | 1996-08-29 | 2001-06-27 | Mitsubishi Denki Kabushiki Kaisha | High-side type motor current detecting circuit |
| CN2524248Y (en) * | 2002-02-06 | 2002-12-04 | 保定浪拜迪电气股份有限公司 | Computer D.C. voltage and isolation monitor and wire selecting device |
| EP1324013B1 (en) * | 2001-12-26 | 2006-12-13 | Seiko Instruments Inc. | Pressure measuring apparatus |
| CN201156055Y (en) * | 2007-12-12 | 2008-11-26 | 江苏省电力公司无锡供电公司 | Sample circuit construction for main voltage and electric bridge voltage |
-
2007
- 2007-12-12 CN CNB2007101912527A patent/CN100549702C/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3048745B2 (en) * | 1992-04-13 | 2000-06-05 | 三菱電機株式会社 | Analog input device |
| EP0827266B1 (en) * | 1996-08-29 | 2001-06-27 | Mitsubishi Denki Kabushiki Kaisha | High-side type motor current detecting circuit |
| EP1324013B1 (en) * | 2001-12-26 | 2006-12-13 | Seiko Instruments Inc. | Pressure measuring apparatus |
| CN2524248Y (en) * | 2002-02-06 | 2002-12-04 | 保定浪拜迪电气股份有限公司 | Computer D.C. voltage and isolation monitor and wire selecting device |
| CN201156055Y (en) * | 2007-12-12 | 2008-11-26 | 江苏省电力公司无锡供电公司 | Sample circuit construction for main voltage and electric bridge voltage |
Non-Patent Citations (2)
| Title |
|---|
| EP 0 827 266 B1 2001.06.27 |
| EP 1 324 013 B1 2006.12.13 |
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| CN101178416A (en) | 2008-05-14 |
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Owner name: STATE ELECTRIC NET CROP. JIANGSU ELECTRIC POWER CO Effective date: 20121019 |
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Effective date of registration: 20121019 Address after: 214061 Jiangsu province Binhu District of Wuxi City Liangxi Road No. 12 Patentee after: Wuxi Power Supply Co., Ltd, Jiangsu Electric Power Co. Patentee after: State Grid Corporation of China Patentee after: Jiangsu Electric Power Company Address before: 214061 Jiangsu province Binhu District of Wuxi City Liangxi Road No. 12 Patentee before: Wuxi Power Supply Co., Ltd, Jiangsu Electric Power Co. |