CN203838237U - Voltage sampling circuit topology for electrical parameter harmonic analyzer - Google Patents
Voltage sampling circuit topology for electrical parameter harmonic analyzer Download PDFInfo
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- CN203838237U CN203838237U CN201320658424.8U CN201320658424U CN203838237U CN 203838237 U CN203838237 U CN 203838237U CN 201320658424 U CN201320658424 U CN 201320658424U CN 203838237 U CN203838237 U CN 203838237U
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Abstract
The utility model relates to a voltage sampling circuit topology for an electrical parameter harmonic analyzer, and the circuit topology comprises a voltage collection chip, and a three-phase voltage collection circuit which is connected with the voltage collection chip. The type of the voltage collection chip is ADE7880. Accordingly, the circuit topology is advantageous in that the design is reasonable; the structure is simple, safe and practical; a main control circuit board is separated from a module collection plate; a high voltage is separated from a low voltage; a precise mutual inductor is employed for isolated sampling of voltage signal collection; a surge-prevention bidirectional-clamping diode is employed; the design of a reversion-connection prevention circuit and a design of current limiting are employed, thereby achieving the protection effect to maximum degree, and bringing convenience to maintenance; an analog circuit and a digital circuit are designed to be separated from each other, employ independent power supplies, and are respectively grounded in analog and digital manners, thereby effectively avoiding signal interference; and the circuit topology employs an advanced sampling chip ADE7880, and employs the dedicated sampling chip ADE 7880.
Description
Technical field
The utility model relates to a kind of voltage sampling circuit topology, especially relates to a kind of voltage 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 voltage sampling circuit topology for electrical quantity harmonic analysis instrument, it is characterized in that bag
The three-phase voltage Acquisition Circuit of drawing together a voltage acquisition chip and being connected with voltage acquisition chip.
In above-mentioned a kind of voltage sampling circuit topology for electrical quantity harmonic analysis instrument, described three-phase voltage Acquisition Circuit includes the damping resistance of at least six series connection, the voltage detecting mutual inductor being connected with the output terminal of damping resistance, and the signal dividing potential drop filtering circuit being connected with voltage detecting mutual inductor.
In above-mentioned a kind of voltage sampling circuit topology for electrical quantity harmonic analysis instrument, described signal dividing potential drop filtering circuit comprises that two ends are connected to the divider resistance at voltage detecting mutual inductor the two poles of the earth, and is connected to the filter assemblies at voltage detecting mutual inductor the two poles of the earth.
In above-mentioned a kind of voltage sampling circuit topology for electrical quantity harmonic analysis instrument, described filter assemblies is the series circuit of resistance and electric capacity, and the resistance two ends of series circuit connect respectively voltage detecting mutual inductor the two poles of the earth.
In above-mentioned a kind of voltage sampling circuit topology for electrical quantity harmonic analysis instrument, also comprise a bi-directional voltage stabilizing pipe that filtered voltage signal is carried out to voltage stabilizing, described bi-directional voltage stabilizing pipe is connected in parallel on the two ends of electric capacity in filter assemblies.
In above-mentioned a kind of voltage sampling circuit topology for electrical quantity harmonic analysis instrument, described voltage acquisition chip model is ADE7880.
Therefore, the utlity model has following advantage: 1. reasonable in design, complete practicality simple in structure; 2.
Separately, separately, voltage signal acquisition 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 utility model comprises the voltage acquisition chip that a model is ADE7880 and the three-phase voltage Acquisition Circuit being connected with voltage acquisition chip.
Three-phase voltage Acquisition Circuit includes the damping resistance of at least six series connection, the voltage detecting mutual inductor being connected with the output terminal of damping resistance, and the signal dividing potential drop filtering circuit being connected with voltage detecting mutual inductor; Signal dividing potential drop filtering circuit comprises that two ends are connected to the divider resistance at voltage detecting mutual inductor the two poles of the earth, and is connected to the filter assemblies at voltage detecting mutual inductor the two poles of the earth; Filter assemblies is the series circuit of resistance and electric capacity, and the resistance two ends of series circuit connect respectively voltage detecting mutual inductor the two poles of the earth.
The utility model also comprises a bi-directional voltage stabilizing pipe that filtered voltage signal is carried out to voltage stabilizing, and described bi-directional voltage stabilizing pipe is connected in parallel on the two ends of electric capacity in filter assemblies.
When work, as shown in Figure 1, the outside three-phase alternating voltage signal to be measured UAIN of map interlinking 1 respectively, UAAN, UBIN, UBAN, UCIN, UCAN, terminal, connecing 6 precision resistances by these terminals decays to outside voltage signal again, the signal that makes to enter voltage transformer (VT) is smaller, because selected voltage transformer (VT) is current mode voltage transformer (VT) in this circuit, the current signal can bear is MA rank, voltage transformer (VT) signal is out through the filtering of electric resistance partial pressure and RC circuit, can reach the receptible voltage range of ADE7880 sampling A/D chip, in this circuit, we have adopted bi-directional voltage stabilizing pipe in addition, filtered voltage signal is carried out to voltage stabilizing, make its clamper in some values, the large I of institute's clamp voltage signal is determined according to selected bi-directional voltage stabilizing pipe.The object of clamper is mainly to prevent that the voltage signal gathering from suddenling change, thereby its voltage is raise, acquisition chip ADE7880 is caused to damage, and the signal after dividing potential drop, filtering, clamper is sent into ADE7880 and carried out signals collecting.
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 (4)
1. for a voltage sampling circuit topology for electrical quantity harmonic analysis instrument, it is characterized in that the three-phase voltage Acquisition Circuit that comprises a voltage acquisition chip and be connected with voltage acquisition chip;
Described three-phase voltage Acquisition Circuit includes the damping resistance of at least six series connection, the voltage detecting mutual inductor being connected with the output terminal of damping resistance, and the signal dividing potential drop filtering circuit being connected with voltage detecting mutual inductor;
Described voltage acquisition chip model is ADE7880.
2. a kind of voltage sampling circuit topology for electrical quantity harmonic analysis instrument according to claim 1, it is characterized in that, described signal dividing potential drop filtering circuit comprises that two ends are connected to the divider resistance at voltage detecting mutual inductor the two poles of the earth, and is connected to the filter assemblies at voltage detecting mutual inductor the two poles of the earth.
3. a kind of voltage sampling circuit topology for electrical quantity harmonic analysis instrument according to claim 2, is characterized in that, described filter assemblies is the series circuit of resistance and electric capacity, and the resistance two ends of series circuit connect respectively voltage detecting mutual inductor the two poles of the earth.
4. a kind of voltage sampling circuit topology for electrical quantity harmonic analysis instrument according to claim 3, it is characterized in that, also comprise a bi-directional voltage stabilizing pipe that filtered voltage signal is carried out to voltage stabilizing, described bi-directional voltage stabilizing pipe is connected in parallel on the two ends of electric capacity in filter assemblies.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320658424.8U CN203838237U (en) | 2013-10-24 | 2013-10-24 | Voltage sampling circuit topology for electrical parameter harmonic analyzer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320658424.8U CN203838237U (en) | 2013-10-24 | 2013-10-24 | Voltage sampling circuit topology for electrical parameter harmonic analyzer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203838237U true CN203838237U (en) | 2014-09-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320658424.8U Expired - Fee Related CN203838237U (en) | 2013-10-24 | 2013-10-24 | Voltage sampling circuit topology for electrical parameter harmonic analyzer |
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| CN (1) | CN203838237U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105425030A (en) * | 2015-12-25 | 2016-03-23 | 福建顺昌虹润精密仪器有限公司 | Three-phase digital electric quantity transmitter |
-
2013
- 2013-10-24 CN CN201320658424.8U patent/CN203838237U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105425030A (en) * | 2015-12-25 | 2016-03-23 | 福建顺昌虹润精密仪器有限公司 | Three-phase digital electric quantity transmitter |
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| Date | Code | Title | Description |
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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 |
Granted publication date: 20140917 Termination date: 20161024 |
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| CF01 | Termination of patent right due to non-payment of annual fee |