CN201615924U - Current voltage sampling circuit - Google Patents
Current voltage sampling circuit Download PDFInfo
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- CN201615924U CN201615924U CN2010201103958U CN201020110395U CN201615924U CN 201615924 U CN201615924 U CN 201615924U CN 2010201103958 U CN2010201103958 U CN 2010201103958U CN 201020110395 U CN201020110395 U CN 201020110395U CN 201615924 U CN201615924 U CN 201615924U
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Abstract
The utility model relates to a current voltage sampling circuit which is applicable to an electric energy metering device. The current voltage sampling circuit comprises a circuit sampling unit and a processor; and the current voltage sampling circuit also comprises a professional electric energy metering chip, and the circuit sampling unit is connected with the interface of the processor through a professional electric energy metering unit. Compared with the prior art, the current voltage sampling circuit increases the measurement accuracy and simplifies the hardware design of the electric energy metering device by adopting the professional electric energy metering chip, thereby not only relieving the processor from complicated mathematical operations and leading the processor to simply take the control task, but also reducing the software programming labor force and increasing the cost performance of the product.
Description
Technical field
The utility model relates to a kind of current-voltage sampling circuit, can be used for electric power meter.
Background technology
In the electric transmission network, the original signal of comprehensive electrical quantity has: Ua, Ub, Uc, Ia, Ib, Ic can get more than 30 electrical quantitys such as outlet voltage, zero-sequence current, frequency, power factor, active power, reactive power, applied power, electric energy in view of the above.Built-in or the A/D change-over circuit that extends out of the current-voltage sampling circuit employ processor of existing electric power meter, the shortcoming of sort circuit is the input circuit complexity, the electric parameter measurement precision is not good enough, cost performance is undesirable, and, processor must carry out lot of data to be handled, mean value, effective value and the cos φ etc. that comprise voltage, electric current, the software programming relative complex.
The utility model content
In view of this, the purpose of this utility model is to provide a kind of measuring accuracy height, cost performance height, the hardware that can make electric power meter, software design simple relatively current-voltage sampling circuit.
In order to realize above purpose, the utility model adopts a kind of like this current-voltage sampling circuit, be used for electric power meter, comprise circuit sampling unit and processor, described current-voltage sampling circuit also comprises special electric energy computation chip, and described circuit sampling unit is connected with the interface of processor through special electric energy metrical unit.The utility model difference with the prior art is: adopt special electric energy computation chip, improved measuring accuracy, simplified the hardware design of electric power meter, processor is freed from numerous and diverse mathematical operation, be engaged in control task simply, and the labour who has reduced software programming, improved the product price ratio.
Especially, described circuit sampling unit comprises phase voltage sampling unit and phase current sampling unit, the input end of described phase voltage sampling unit is through resistance R 101, R102, R103, R104 is connected with the former limit of current mode voltage transformer (VT) T1, behind the two ends and connecting resistance R106 of the secondary of described current mode voltage transformer (VT) T1, the phase voltage passage that passes through rc filter circuit and special electric energy computation chip respectively just, the negative analog input pin connects, the input end of described phase current sampling unit is through current transformer, behind the output terminal of current transformer and the connecting resistance R114, the phase current passage that passes through rc filter circuit and special electric energy computation chip respectively just, the negative analog input pin connects, described phase voltage, the phase current passage just, the negative analog input pin is through being connected with the reference voltage output pin REFOUT of special electric energy computation chip behind the pull-up resistor.The circuit sampling unit of this employing current mode voltage transformer (VT) summation current transformer is kept apart high-pressure delivery circuit and measurement mechanism, has improved safety coefficient.
Especially, described special electric energy computation chip is ATT7022B, supports gain, the phase correction in digital territory, promptly supports the pure software calibration.
Description of drawings
Fig. 1 is a current-voltage sampling circuit schematic diagram of the present utility model.
Embodiment
Shown in Figure 1 is a kind of current-voltage sampling circuit, be used for electric power meter, comprise circuit sampling unit, special electric energy computation chip and processor, circuit sampling unit wherein comprises A, B, C three-phase voltage sampling unit and A, B, C three-phase current sampling unit.Input end J100, the J101 of A phase voltage sampling unit is connected with the former limit of current mode voltage transformer (VT) T1 through resistance R 101, R102, R103, R104, behind the two ends and connecting resistance R106 of current mode voltage transformer (VT) T1 secondary, pass through two groups of rc filter circuits that constitute by R105, C101 and R107, C102 respectively, be connected with positive and negative analog input pin V2P, the V2N of the phase voltage passage of special electric energy computation chip U1, the current mode voltage transformer (VT) generally adopts 2mA/2mA.Input end J102, the J103 of A phase current sampling unit is through current transformer, behind the output terminal of current transformer and the connecting resistance R114, two groups of rc filter circuits through being made of R110, C103 and R111, C104 respectively are connected with positive and negative analog input pin V1P, the V1N of the phase current passage of special electric energy computation chip U1.The positive and negative analog input pin of phase voltage, phase current passage is respectively through being connected with the reference voltage output pin REFOUT of special electric energy computation chip U1 behind pull-up resistor R108, R109, R112, the R113.B, C phase voltage, phase current sample circuit adopt and A phase voltage, circuit structure that phase current is identical.Special electric energy computation chip in the utility model adopts ATT7022B, this chip the is integrated circuit such as digital signal processing of six road second order sigma-deltaADC, reference voltage circuit and all power, energy, effective value, power factor and frequency measurement can fully satisfy the demand of multiple rate multifunction electric meter; Chip is also supported gain, the phase correction in digital territory; This chip has the SPI interface, can make things convenient for and processor between carry out the communication of measuring parameter and calibration parameter.
Claims (3)
1. current-voltage sampling circuit, be used for electric power meter, comprise circuit sampling unit and processor, it is characterized in that: described current-voltage sampling circuit also comprises special electric energy computation chip, and described circuit sampling unit is connected with the interface of processor through special electric energy metrical unit.
2. current-voltage sampling circuit according to claim 1, it is characterized in that: described circuit sampling unit comprises phase voltage sampling unit and phase current sampling unit, the input end of described phase voltage sampling unit is through resistance (R101, R102, R103, R104) the former limit with current mode voltage transformer (VT) (T1) is connected, behind the two ends of the secondary of described current mode voltage transformer (VT) (T1) and the connecting resistance (R106), the phase voltage passage that passes through rc filter circuit and special electric energy computation chip respectively just, the negative analog input pin connects, the input end of described phase current sampling unit is through current transformer, behind the output terminal of current transformer and the connecting resistance (R114), the phase current passage that passes through rc filter circuit and special electric energy computation chip respectively just, the negative analog input pin connects, described phase voltage, the phase current passage just, the negative analog input pin is through being connected with the reference voltage output pin (REFOUT) of special electric energy computation chip behind the pull-up resistor.
3. current-voltage sampling circuit according to claim 1 and 2 is characterized in that: described special electric energy computation chip is ATT7022B.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201103958U CN201615924U (en) | 2010-01-29 | 2010-01-29 | Current voltage sampling circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201103958U CN201615924U (en) | 2010-01-29 | 2010-01-29 | Current voltage sampling circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201615924U true CN201615924U (en) | 2010-10-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201103958U Expired - Fee Related CN201615924U (en) | 2010-01-29 | 2010-01-29 | Current voltage sampling circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201615924U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102608987A (en) * | 2012-04-05 | 2012-07-25 | 何平 | Monitoring control system for remote radio parameter |
| CN103513091A (en) * | 2013-10-12 | 2014-01-15 | 河南开启电力实业有限公司 | Abnormal overcurrent on-line detection device |
| CN103529280A (en) * | 2013-10-12 | 2014-01-22 | 河南开启电力实业有限公司 | Abnormal overvoltage on-line detection device |
| CN104460455A (en) * | 2014-12-08 | 2015-03-25 | 重庆跃达电力设备有限公司 | Electric power line monitoring sampling reference frequency conversion circuit with power circuit |
| CN105652079A (en) * | 2016-02-29 | 2016-06-08 | 国网山东省电力公司青岛供电公司 | Alternating-current sampling device |
-
2010
- 2010-01-29 CN CN2010201103958U patent/CN201615924U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102608987A (en) * | 2012-04-05 | 2012-07-25 | 何平 | Monitoring control system for remote radio parameter |
| CN103513091A (en) * | 2013-10-12 | 2014-01-15 | 河南开启电力实业有限公司 | Abnormal overcurrent on-line detection device |
| CN103529280A (en) * | 2013-10-12 | 2014-01-22 | 河南开启电力实业有限公司 | Abnormal overvoltage on-line detection device |
| CN104460455A (en) * | 2014-12-08 | 2015-03-25 | 重庆跃达电力设备有限公司 | Electric power line monitoring sampling reference frequency conversion circuit with power circuit |
| CN104460455B (en) * | 2014-12-08 | 2017-05-17 | 重庆跃达电力设备有限公司 | Electric power line monitoring sampling reference frequency conversion circuit with power circuit |
| CN105652079A (en) * | 2016-02-29 | 2016-06-08 | 国网山东省电力公司青岛供电公司 | Alternating-current sampling device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: ZHEJIANG XINDA ELECTRIC CO., LTD. Free format text: FORMER NAME: ZHEJIANG CLION RELAY CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 325604 Station Road, Liushi Town, Zhejiang, Yueqing, No. 173 Patentee after: ZHEJIANG CLION ELECTRIC CO., LTD. Address before: 325604 Station Road, Liushi Town, Zhejiang, Yueqing, No. 173 Patentee before: Zhejiang Clion Relay Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101027 Termination date: 20150129 |
|
| EXPY | Termination of patent right or utility model |