CN203658438U - Electric current sampling circuit topology used for electrical parameter harmonic wave analyzer - Google Patents
Electric current sampling circuit topology used for electrical parameter harmonic wave analyzer Download PDFInfo
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- CN203658438U CN203658438U CN201320658423.3U CN201320658423U CN203658438U CN 203658438 U CN203658438 U CN 203658438U CN 201320658423 U CN201320658423 U CN 201320658423U CN 203658438 U CN203658438 U CN 203658438U
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- 238000005070 sampling Methods 0.000 title claims abstract description 24
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- 238000013461 design Methods 0.000 abstract description 6
- 238000002955 isolation Methods 0.000 abstract description 3
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- 238000000926 separation method Methods 0.000 abstract 3
- 230000002457 bidirectional effect Effects 0.000 abstract 1
- 238000012423 maintenance Methods 0.000 abstract 1
- 230000002265 prevention Effects 0.000 abstract 1
- 238000013480 data collection Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
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Abstract
The utility model relates to an electric current sampling circuit topology used for an electrical parameter harmonic wave analyzer. The electric current sampling circuit topology used for an electrical parameter harmonic wave analyzer comprises an electric current acquisition chip and a three-phase electric current acquisition circuit connected with the electric current acquisition chip, and the model of the electric current acquisition chip is ADE7880. Thus, the electric current sampling circuit topology used for an electrical parameter harmonic wave analyzer is advantaged by 1 reasonable design, simple structure and practicality; 2 separation of a main control circuit board and a module acquisition board, separation of high voltage and low voltage, precision mutual inductor adopted for isolation sampling operation of electric current signal acquisition, adoption of anti-surge bidirectional clamping diodes, adoption of a reversal-connection-proof circuit, current limiting design, protection effects exerted to the maximum degree, and convenience of maintenance; 3 separation of an analog circuit and a digital circuit which are supplied with electric power through individual power sources, analog and digital sites that are each grounded through one point, and effective prevention of signal interference; 4, advanced sampling chip ADE 7880, and adoption of the ADE 7880 special-purpose sampling chip.
Description
Technical field
The utility model relates to a kind of current sampling circuit topology, especially relates to a kind of current sampling circuit topology for electrical quantity harmonic analysis instrument.
Background technology
Electrical quantity frequency analysis equipment has a lot of families to do at home, and still more complete in function, should not a lot of based on this principle framework, because ADE7880 chip is up-to-date electric energy computation chip, and carry frequency analysis function, but can ensure by accuracy and reliability that this chip has measurement to a certain extent.The framework major part that realizes is in the past all that DSP adds adc data collection, the pattern of utilizing fft algorithm to calculate.
Utility model content
Above-mentioned technical matters of the present utility model is mainly solved by following technical proposals:
For a current sampling circuit topology for electrical quantity harmonic analysis instrument, it is characterized in that bag
The three-phase current Acquisition Circuit of drawing together a current acquisition chip and being connected with current acquisition chip.
At above-mentioned a kind of current sampling circuit topology for electrical quantity harmonic analysis instrument, the signal dividing potential drop filtering circuit that described described three-phase current Acquisition Circuit includes a current detecting mutual inductor and is connected with current detecting mutual inductor.
In above-mentioned a kind of current sampling circuit topology for electrical quantity harmonic analysis instrument, after described signal dividing potential drop filtering circuit comprises two series connection, two ends are connected to the divider resistance at current detecting mutual inductor the two poles of the earth, and are connected to the filter assemblies at current detecting mutual inductor the two poles of the earth.
In above-mentioned a kind of current sampling circuit topology for electrical quantity harmonic analysis instrument, described filter assemblies comprises the series circuit of two groups of resistance and electric capacity, every group of series circuit includes resistance and the electric capacity of series connection successively, resistance one end of every group of series circuit connects respectively current detecting mutual inductor the two poles of the earth, after electric capacity one end of every group of series circuit is connected to each other, is connected and ground connection with the connected node of divider resistance.
In above-mentioned a kind of current sampling circuit topology for electrical quantity harmonic analysis instrument, described current acquisition chip model is ADE7880.
Therefore, the utlity model has following advantage: 1. reasonable in design, complete practicality simple in structure; 2.
Separately, separately, current signal collection adopts precision transformer isolation sampling for high voltage and low-voltage for main control board and module collection plate; adopt the two-way clamp diode of Anti-surging; adopt reverse-connection preventing circuit design and current limliting design, played to greatest extent protective effect, maintain easily simultaneously.3.. separately design of mimic channel and digital circuit, adopts independent power supply to power respectively, in analog and digitally single-point grounding, effectively avoids the interference of signal.4. advanced person's sampling A/D chip ADE7880; Adopt the special sampling A/D chip of ADE7880.
Brief description of the drawings
Fig. 1 is circuit topological structure schematic diagram of the present utility model.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, the technical solution of the utility model is described in further detail.
Embodiment:
The three-phase current Acquisition Circuit that the utility model comprises a current acquisition chip and the model that is connected with current acquisition chip is ADE7880.The signal dividing potential drop filtering circuit that described three-phase current Acquisition Circuit includes a current detecting mutual inductor and is connected with current detecting mutual inductor.
Signal dividing potential drop filtering circuit comprises that two ends after two series connection are connected to the divider resistance at current detecting mutual inductor the two poles of the earth, and be connected to the filter assemblies at current detecting mutual inductor the two poles of the earth, filter assemblies comprises the series circuit of two groups of resistance and electric capacity, every group of series circuit includes resistance and the electric capacity of series connection successively, resistance one end of every group of series circuit connects respectively current detecting mutual inductor the two poles of the earth, after electric capacity one end of every group of series circuit is connected to each other, is connected and ground connection with the connected node of divider resistance.
When work, as shown in Figure 1, AIAP, AIAN, BIBP, BIBN, CICP, CICN terminal in outside three-phase alternating current signal difference map interlinking to be measured, by these terminals, foreign current signal is entered to current detecting mutual inductor, the effect of current detecting mutual inductor is transformed to little electric current pro rata large electric current outside to be measured, the object that is transformed to little electric current is mainly convenient to enter sampling A/D chip and is carried out current detecting, because adopting the receptible signal voltage range of sampling terminal of chip ADE7880 is ± 500mv to be secondly the isolation of high-low pressure signal.Through current detecting mutual inductor signal out, may be also larger, exceed the receptible scope of employing chip, therefore also need resistance to carry out dividing potential drop, the divider resistance that we adopt in this circuit is 62 ohm, mutual inductor signal out may, also with the noise signal of different frequency, therefore adopt RC (series circuit of resistance and electric capacity) to carry out filtering in circuit in addition, filtered signal is sent into ADE7880 sampling A/D chip and carry out current data collection.
ADE7880 is the three-phase high-accuracy multifunctional electric energy computation chip that ADI company of the U.S. releases, and built-in dsp chip, for complicated calculating, has surmounted industrial to the precision of 0.2 grade of table of electric energy metrical and dynamic requirement.The voltage and current passage of ADE7880 is 24bit ∑-△ type ADC, and voltage and current effective value is 1000:1 in dynamic range is less than 0.1% under dynamically, and electric energy is dynamically being less than 0.1% under 1000:1, dynamically under 3000:1, is being less than 0.2%.ADE7880 can also carry out signal harmonic collection calculating.
ADE7880 provides I2C, SPI, HSDC several data interface and 3 outputs of pulse flexibly, ADE7880 can provide first-harmonic to gain merit and reactive power simultaneously, always (first-harmonic+harmonic wave) gains merit and reactive power, apparent electric energy metrical, and first-harmonic is meritorious to be calculated with reactive energy measurement and RMS.
ADE7880 is applicable to measuring under various three phase arrangement meritorious, idle and apparent electric energy, as phase three-wire three (corner connection), three-phase and four-line (star) and other metering method, also support current transformer (CT) and differential coil current sensor simultaneously, support the Wave data output of all passages.
ADE7880 supports multiple calibration mode, each phase stage, namely effective value offset correction, phase alignment and gain calibration.This CF1, CF2 and the output of CF3 logic provide multiple available: gain merit/reactive power of total/first-harmonic, total applied power, or total current effective value.
Specific embodiment described herein is only to the explanation for example of the utility model spirit.The utility model person of ordinary skill in the field can make various amendments or supplements or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present utility model or surmount the defined scope of appended claims.
Claims (3)
1. for a current sampling circuit topology for electrical quantity harmonic analysis instrument, it is characterized in that the three-phase current Acquisition Circuit that comprises a current acquisition chip and be connected with current acquisition chip;
Described current acquisition chip model is ADE7880;
The signal dividing potential drop filtering circuit that described three-phase current Acquisition Circuit includes a current detecting mutual inductor and is connected with current detecting mutual inductor.
2. a kind of current sampling circuit topology for electrical quantity harmonic analysis instrument according to claim 1, it is characterized in that, after described signal dividing potential drop filtering circuit comprises two series connection, two ends are connected to the divider resistance at current detecting mutual inductor the two poles of the earth, and are connected to the filter assemblies at current detecting mutual inductor the two poles of the earth.
3. a kind of current sampling circuit topology for electrical quantity harmonic analysis instrument according to claim 3, it is characterized in that, described filter assemblies comprises the series circuit of two groups of resistance and electric capacity, every group of series circuit includes resistance and the electric capacity of series connection successively, resistance one end of every group of series circuit connects respectively current detecting mutual inductor the two poles of the earth, after electric capacity one end of every group of series circuit is connected to each other, is connected and ground connection with the connected node of divider resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320658423.3U CN203658438U (en) | 2013-10-24 | 2013-10-24 | Electric current sampling circuit topology used for electrical parameter harmonic wave analyzer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320658423.3U CN203658438U (en) | 2013-10-24 | 2013-10-24 | Electric current sampling circuit topology used for electrical parameter harmonic wave analyzer |
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| CN203658438U true CN203658438U (en) | 2014-06-18 |
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| CN201320658423.3U Expired - Fee Related CN203658438U (en) | 2013-10-24 | 2013-10-24 | Electric current sampling circuit topology used for electrical parameter harmonic wave analyzer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111007311A (en) * | 2019-12-31 | 2020-04-14 | 山东计保电气有限公司 | Micro-current apparent power sensing method and device |
| CN116359662A (en) * | 2022-12-16 | 2023-06-30 | 江苏联宏智慧能源股份有限公司 | An anomaly detection and wave recording system for power grid and its implementation method |
-
2013
- 2013-10-24 CN CN201320658423.3U patent/CN203658438U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111007311A (en) * | 2019-12-31 | 2020-04-14 | 山东计保电气有限公司 | Micro-current apparent power sensing method and device |
| CN116359662A (en) * | 2022-12-16 | 2023-06-30 | 江苏联宏智慧能源股份有限公司 | An anomaly detection and wave recording system for power grid and its implementation method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140618 Termination date: 20161024 |