CN203012011U - Power measuring device - Google Patents
Power measuring device Download PDFInfo
- Publication number
- CN203012011U CN203012011U CN 201320015787 CN201320015787U CN203012011U CN 203012011 U CN203012011 U CN 203012011U CN 201320015787 CN201320015787 CN 201320015787 CN 201320015787 U CN201320015787 U CN 201320015787U CN 203012011 U CN203012011 U CN 203012011U
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- voltage
- current
- divider
- processor
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Abstract
The utility model relates to a power measuring device, which belongs to the field of electrical measurement, and solves problems of application limitations and high application cost of a current/voltage transformer and a Hall current/voltage sensor which are used for measuring power in the prior art. The power measuring device comprises a current divider, a voltage divider, a current signal conditioning circuit, a voltage signal conditioning circuit, a current A/D conversion circuit, a voltage A/D conversion circuit and a processor, wherein outgoing lines at two ends of a sampling resistor Ri of the current divider are voltage signal output ends of the current divider, and voltage signals are outputted to the processor through the current signal conditioning circuit and the current A/D conversion circuit; outgoing lines at two ends of a divider resistor Rv of the voltage divider are voltage signal output ends of the voltage divider, and voltage signals are outputted to the processor through an input end of the voltage signal conditioning circuit and the voltage A/D conversion circuit; and a synchronous sampling control end of the processor is connected with a current sampling control end of the current A/D conversion circuit and a voltage sampling control end of the voltage A/D conversion circuit simultaneously.
Description
Technical field
The utility model relates to power-measuring device, belongs to the electric measurement field.
Background technology
the result that the power-measuring device of Electrical Measurement System will obtain is active power, reactive power, the phase differential of applied power and voltage signal and current signal, the technological means that mostly adopts at present is synchronous acquisition current signal and voltage signal, utilize current transformer or Hall current sensor to gather current signal, utilize voltage transformer (VT) or Hall voltage sensor to gather voltage signal, but current/voltage mutual inductor, Hall current/voltage sensor is used in Electrical Measurement System has certain limitation, the restriction that the current/voltage mutual inductor is subject to frequency band can only detect near the current/voltage signal of frequency band rated frequency ± 5%, and signal is non-direct current signal, the frequency band that Hall current/voltage sensor uses is 0-100kHz, although can satisfy existing electric measurement frequency band requirement and Current Control precision, it is difficult to satisfy high-precision measurement requirement in whole frequency band and range ability.And their application cost is all very high.
Summary of the invention
The utility model purpose is for the current/voltage mutual inductor that solves present measurement power, Hall current/voltage sensor application limitation and the high problem of application cost, and a kind of power-measuring device is provided.
Power-measuring device described in the utility model, it comprises shunt, voltage divider, current signal conditioning circuit, voltage signal conditioning circuit, electric current A/D change-over circuit, voltage A/D change-over circuit and processor,
The sampling resistor Ri two ends extension line of shunt is the voltage signal output end of shunt, the voltage signal output end of described shunt is connected with the input end of current signal conditioning circuit, the output terminal of current signal conditioning circuit is connected with the analog input end of electric current A/D change-over circuit, and the digital output end of A/D change-over circuit is connected with the current signal input end of processor;
The divider resistance Rv two ends extension line of voltage divider is the voltage signal output end of voltage divider, the voltage signal output end of described voltage divider is connected with the input end of voltage signal conditioning circuit, the output terminal of voltage signal conditioning circuit is connected with the analog input end of voltage A/D change-over circuit, and the digital output end of voltage A/D change-over circuit is connected with the voltage signal input end of processor;
The synchronized sampling control end of processor is connected with the current sample control end of electric current A/D change-over circuit and the voltage sample control end of voltage A/D change-over circuit simultaneously.
Advantage of the present utility model: control shunt/voltage divider acquisition voltage signal of sampling simultaneously by processor, and process on the backstage, the direct result that will use of acquisition at the scene, it is the phase differential of active power, reactive power, applied power and voltage signal and current signal, like this, do not cause line drop in the time of can be because of long Distance Transmission, guaranteed the high precision of measuring.And application cost is very cheap.
Description of drawings
Fig. 1 is the structural representation of power-measuring device described in the utility model.
Fig. 2 is the measuring principle figure of shunt and voltage divider.
Embodiment
Embodiment one: present embodiment is described below in conjunction with Fig. 1 and Fig. 2, the described power-measuring device of present embodiment, it comprises shunt 1, voltage divider 2, current signal conditioning circuit 3, voltage signal conditioning circuit 4, electric current A/D change-over circuit 5, voltage A/D change-over circuit 6 and processor 7
The sampling resistor Ri two ends extension line of shunt 1 is the voltage signal output end of shunt 1, the voltage signal output end of described shunt 1 is connected with the input end of current signal conditioning circuit 3, the output terminal of current signal conditioning circuit 3 is connected with the analog input end of electric current A/D change-over circuit 5, and the digital output end of A/D change-over circuit 5 is connected with the current signal input end of processor 7;
The divider resistance Rv two ends extension line of voltage divider 2 is the voltage signal output end of voltage divider 2, the voltage signal output end of described voltage divider 2 is connected with the input end of voltage signal conditioning circuit 4, the output terminal of voltage signal conditioning circuit 4 is connected with the analog input end of voltage A/D change-over circuit 6, and the digital output end of voltage A/D change-over circuit 6 is connected with the voltage signal input end of processor 7;
The synchronized sampling control end of processor 7 is connected with the current sample control end of electric current A/D change-over circuit 5 and the voltage sample control end of voltage A/D change-over circuit 6 simultaneously.
What the utility model device was realized is the measurement of power, and the measurement of power need to gather two signals, a current signal, one is voltage signal, in present embodiment, gathers current signal with shunt 1, gather voltage signal with voltage divider 2,, referring to Fig. 2, its measuring principle is described.
Whole resistance of voltage divider 2 are R
T, be connected in parallel in the loop that needs to measure resistance R
TThe tested voltage in two ends is U, divider resistance R
vIt is resistance R
TA part, divider resistance R
vThe branch pressure voltage at two ends is u
v, gather divider resistance R
vThe branch pressure voltage u at two ends
vFlow to voltage signal conditioning circuit 4, u
v=U * R
T/ R
v, general divider resistance R
vResistance very little, so just can realize the measurement of high pressure.
Give simultaneously processor 7 through current signal and voltage signal after the A/D conversion, obtain power.
Embodiment two: present embodiment is described further embodiment one, and processor 7 adopts the DSP digital signal processor to realize.
Claims (2)
1. power-measuring device, it is characterized in that, it comprises shunt (1), voltage divider (2), current signal conditioning circuit (3), voltage signal conditioning circuit (4), electric current A/D change-over circuit (5), voltage A/D change-over circuit (6) and processor (7)
The sampling resistor Ri two ends extension line of shunt (1) is the voltage signal output end of shunt (1), the voltage signal output end of described shunt (1) is connected with the input end of current signal conditioning circuit (3), the output terminal of current signal conditioning circuit (3) is connected with the analog input end of electric current A/D change-over circuit (5), and the digital output end of A/D change-over circuit 5 is connected with the current signal input end of processor (7);
The divider resistance Rv two ends extension line of voltage divider (2) is the voltage signal output end of voltage divider (2), the voltage signal output end of described voltage divider (2) is connected with the input end of voltage signal conditioning circuit (4), the output terminal of voltage signal conditioning circuit (4) is connected with the analog input end of voltage A/D change-over circuit (6), and the digital output end of voltage A/D change-over circuit (6) is connected with the voltage signal input end of processor (7);
The synchronized sampling control end of processor (7) is connected with the current sample control end of electric current A/D change-over circuit (5) and the voltage sample control end of voltage A/D change-over circuit (6) simultaneously.
2. power-measuring device according to claim 1, is characterized in that, processor (7) adopts the DSP digital signal processor to realize.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320015787 CN203012011U (en) | 2013-01-14 | 2013-01-14 | Power measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320015787 CN203012011U (en) | 2013-01-14 | 2013-01-14 | Power measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203012011U true CN203012011U (en) | 2013-06-19 |
Family
ID=48603593
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320015787 Expired - Fee Related CN203012011U (en) | 2013-01-14 | 2013-01-14 | Power measuring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203012011U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105319437A (en) * | 2014-08-05 | 2016-02-10 | 国家电网公司 | Direct-current power sampling system |
| CN110045181A (en) * | 2019-05-02 | 2019-07-23 | 福建省产品质量检验研究院 | AC/DC contactor coil power dissipation tester |
-
2013
- 2013-01-14 CN CN 201320015787 patent/CN203012011U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105319437A (en) * | 2014-08-05 | 2016-02-10 | 国家电网公司 | Direct-current power sampling system |
| CN110045181A (en) * | 2019-05-02 | 2019-07-23 | 福建省产品质量检验研究院 | AC/DC contactor coil power dissipation tester |
| CN110045181B (en) * | 2019-05-02 | 2021-02-09 | 福建省产品质量检验研究院 | AC/DC contactor coil power consumption tester |
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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: 20130619 Termination date: 20140114 |