CN204008832U - A kind of sampling A/D chip and the sample circuit of built-in AD to same passage of measuring - Google Patents
A kind of sampling A/D chip and the sample circuit of built-in AD to same passage of measuring Download PDFInfo
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- CN204008832U CN204008832U CN201420302337.3U CN201420302337U CN204008832U CN 204008832 U CN204008832 U CN 204008832U CN 201420302337 U CN201420302337 U CN 201420302337U CN 204008832 U CN204008832 U CN 204008832U
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Abstract
The utility model discloses a kind of sampling A/D chip and the sample circuit of built-in AD to same passage of measuring, comprise current transformer, sample resistance, anti-aliasing filtering circuit, filter straight electric capacity, amplifying circuit, metering sampling A/D chip, the CPU of built-in AD, the input end of current transformer is external by electric line, sample resistance is connected in parallel on the output terminal of current transformer, sample resistance is provided with two-way output, one tunnel output is connected with the input end of anti-aliasing filtering circuit, another road output is connected with one end of the straight electric capacity of filter, the output terminal of anti-aliasing filtering circuit is connected with the sampled signal input end of metering sampling A/D chip, the other end of filtering straight electric capacity is connected with the sampled signal input end of the CPU of built-in AD by amplifying circuit.The utility model, can realize two AD Acquisition Circuit and gather a passage simultaneously, realizes information about power, protects loop to gather simultaneously, and isolation is good, does not disturb mutually, ensures acquisition precision, has a good application prospect.
Description
Technical field
The utility model relates to a kind of metering sampling A/D chip and the sample circuit of built-in AD to same passage of realizing protection loop Real-time Collection for electric energy meter, belongs to electric energy meter field of measuring technique.
Background technology
In electric system, in order to improve the security of operation of power networks, often will measure two kinds of devices of ammeter information and relay protection function separately, use separately, but, in certain applications, need a device in conjunction with two kinds of functions, in electric energy meter, increase real time protection, traditional mode, to adopt to increase outside TA, TV(foreign current mutual inductor, external voltage mutual inductor) protect loop Real-time Collection, but, cost of manufacture is larger, be inconvenient to produce in batches, how not increase outside TA, in TV situation, to same sampling channel, realize measuring circuit and real-time guard loop gathers in real time simultaneously, and ensure acquisition precision, it is the current problem that needs solution.
Utility model content
The purpose of this utility model is to overcome the existing real time protection that increases in electric energy meter, need to increase outside TA, and TV protects loop Real-time Collection, and cost of manufacture is larger, the problem of being inconvenient to produce in batches.The metering sampling A/D chip that the utility model provides and the sample circuit of built-in AD to same passage; can realize two AD Acquisition Circuit and gather a passage simultaneously; realize information about power collection, protection loop Real-time Collection; without increasing outside TA, TV; do not increase cost, isolation is good, does not disturb mutually; ensure acquisition precision, have a good application prospect.
In order to achieve the above object, the technical solution used in the present invention is:
A kind of sampling A/D chip and the sample circuit of built-in AD to same passage of measuring, it is characterized in that: comprise current transformer, sample resistance, anti-aliasing filtering circuit, filter straight electric capacity, amplifying circuit, metering sampling A/D chip, the CPU of built-in AD, the input end of described current transformer is external by electric line, described sample resistance is connected in parallel on the output terminal of current transformer, described sample resistance is provided with two-way output, one tunnel output is connected with the input end of anti-aliasing filtering circuit, another road output is connected with one end of the straight electric capacity of filter, the output terminal of described anti-aliasing filtering circuit is connected with the sampled signal input end of metering sampling A/D chip, the other end of the straight electric capacity of described filter is connected with the sampled signal input end of the CPU of built-in AD by amplifying circuit.
Aforesaid metering sampling A/D chip and the sample circuit of built-in AD to same passage, it is characterized in that: described anti-aliasing filtering circuit comprises the first resistance R 1, the second resistance R 2, the first capacitor C 1, the second capacitor C 2 and the 3rd capacitor C 3, described the first resistance R 1 is connected with one end of sample resistance, described the second resistance R 2 is connected with the other end of sample resistance, described the second capacitor C 2 is connected in parallel on the two ends of sample resistance, described the first capacitor C 1, the 3rd capacitor C 3 is in series, and be connected in parallel on the two ends of sample resistance, described the first capacitor C 1, the 3rd capacitor C 3 junctions be digitally connected.
Aforesaid metering sampling A/D chip and the sample circuit of built-in AD to same passage, is characterized in that: the resistance of described sample resistance is 36 Ω, and the capacitance of the straight electric capacity of described filter is 10uf.
Aforesaid metering sampling A/D chip and the sample circuit of built-in AD to same passage, it is characterized in that: the straight electric capacity of described filter is connected with the reverse input end of amplifying circuit by the 3rd resistance R 3, is provided with feedback resistance R4 between the output terminal of described amplifying circuit and amplifying circuit.
Aforesaid metering sampling A/D chip and the sample circuit of built-in AD to same passage, is characterized in that: in described amplifying circuit, be provided with AD8608AR operational amplifier.
Aforesaid metering sampling A/D chip and the sample circuit of built-in AD to same passage, is characterized in that: the model of described metering sampling A/D chip is ATT7022 computation chip.
The beneficial effects of the utility model are: metering sampling A/D chip of the present utility model and the sample circuit of built-in AD to same passage; can realize two AD Acquisition Circuit and gather a passage simultaneously; realize information about power collection, protection loop Real-time Collection; without increasing outside TA, TV; do not increase cost, isolation is good, does not disturb mutually; ensure acquisition precision, have a good application prospect.
Brief description of the drawings
Fig. 1 is the system chart of metering sampling A/D chip of the present utility model and the sample circuit of built-in AD to same passage.
Fig. 2 is the circuit diagram of metering sampling A/D chip of the present utility model and the sample circuit of built-in AD to same passage.
Embodiment
Below in conjunction with Figure of description, the utility model is described in further detail.Following examples are only for the technical solution of the utility model is more clearly described, and can not limit protection domain of the present utility model with this.
As shown in Figure 1, a kind of sampling A/D chip and the sample circuit of built-in AD to same passage of measuring, comprise current transformer, sample resistance, anti-aliasing filtering circuit, filter straight electric capacity, amplifying circuit, metering sampling A/D chip, the CPU of built-in AD, the input end of current transformer is external by electric line, sample resistance is connected in parallel on the output terminal of current transformer, sample resistance is provided with two-way output, one tunnel output is connected with the input end of anti-aliasing filtering circuit, another road output is connected with one end of the straight electric capacity of filter, the output terminal of described anti-aliasing filtering circuit is connected with the sampled signal input end of metering sampling A/D chip, the other end of filtering straight electric capacity is connected with the sampled signal input end of the CPU of built-in AD by amplifying circuit, wherein measure sampling A/D chip and can obtain the information about power parameter needing to the sampling of passage, the CPU of built-in AD can obtain the protection loop real-time parameter needing to the sampling of passage, without increasing outside TA, TV, do not increase cost, and, the input signal that anti-aliasing filtering circuit can be good at elimination metering sampling A/D chip disturbs, filter straight electric capacity can be good at the built-in AD of elimination CPU input signal disturb.
The resistance of described sample resistance is 36 Ω, resistance is crossed the sample rate current leakage that conference causes current transformer, affect measuring accuracy, also can cause the output power increase of current transformer time, make coil heating, affect the use longevity of current transformer, the capacitance of the straight electric capacity of described filter is 10uf, can filtering sample resistance be the noise signal after voltage by current conversion.
As shown in Figure 2, described anti-aliasing filtering circuit comprises the first resistance R 1, the second resistance R 2, the first capacitor C 1, the second capacitor C 2 and the 3rd capacitor C 3, described the first resistance R 1 is connected with one end of sample resistance, described the second resistance R 2 is connected with the other end of sample resistance, described the second capacitor C 2 is connected in parallel on the two ends of sample resistance, described the first capacitor C 1, the 3rd capacitor C 3 is in series, and be connected in parallel on the two ends of sample resistance R, the first capacitor C 1, the 3rd capacitor C 3 junctions be digitally connected, sample resistance R is connected in parallel on the output terminal of Current Transmit, filtering straight capacitor C is connected with the reverse input end of amplifying circuit by the 3rd resistance R 3, between the output terminal of amplifying circuit and amplifying circuit, be provided with feedback resistance R4, the 3rd resistance R 3 here, increase the input impedance of amplifying circuit, lower the output impedance of amplifying circuit, to metering sampling A/D chip, two sample circuits of CPU of built-in AD, play buffer action, preventing from interfering with each other can, gather to realize when measure in real time in electrical measurement and protection loop simultaneously, in amplifying circuit, be provided with AD8608AR operational amplifier, AD8608AR is low in energy consumption, amplify precision high, temperature is less than normal, and, low price.
The model of described metering sampling A/D chip is ATT7022 computation chip, and ATT7022 computation chip carries the ADC module of 16bit, and acquisition precision is high, and processing speed is fast.
In sum; metering sampling A/D chip of the present utility model and the sample circuit of built-in AD to same passage; can realize two AD Acquisition Circuit and gather a passage simultaneously; realize information about power collection, protection loop Real-time Collection, without increasing outside TA, TV, do not increase cost; isolation is good; do not disturb mutually, ensure acquisition precision, have a good application prospect.
More than show and described ultimate principle of the present utility model, principal character and advantage.The technician of the industry should understand; the utility model is not restricted to the described embodiments; that in above-described embodiment and instructions, describes just illustrates principle of the present utility model; do not departing under the prerequisite of the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (6)
1. one kind is measured sampling A/D chip and the sample circuit of built-in AD to same passage, it is characterized in that: comprise current transformer, sample resistance, anti-aliasing filtering circuit, filter straight electric capacity, amplifying circuit, metering sampling A/D chip, the CPU of built-in AD, the input end of described current transformer is external by electric line, described sample resistance is connected in parallel on the output terminal of current transformer, described sample resistance is provided with two-way output, one tunnel output is connected with the input end of anti-aliasing filtering circuit, another road output is connected with one end of the straight electric capacity of filter, the output terminal of described anti-aliasing filtering circuit is connected with the sampled signal input end of metering sampling A/D chip, the other end of the straight electric capacity of described filter is connected with the sampled signal input end of the CPU of built-in AD by amplifying circuit.
2. metering sampling A/D chip according to claim 1 and the sample circuit of built-in AD to same passage, it is characterized in that: described anti-aliasing filtering circuit comprises the first resistance R 1, the second resistance R 2, the first capacitor C 1, the second capacitor C 2 and the 3rd capacitor C 3, described the first resistance R 1 is connected with one end of sample resistance, described the second resistance R 2 is connected with the other end of sample resistance, described the second capacitor C 2 is connected in parallel on the two ends of sample resistance, described the first capacitor C 1, the 3rd capacitor C 3 is in series, and be connected in parallel on the two ends of sample resistance, described the first capacitor C 1, the 3rd capacitor C 3 junctions be digitally connected.
3. metering sampling A/D chip according to claim 1 and the sample circuit of built-in AD to same passage, is characterized in that: the resistance of described sample resistance is 36 Ω, the capacitance of the straight electric capacity of described filter is 10uf.
4. metering sampling A/D chip according to claim 1 and the sample circuit of built-in AD to same passage, it is characterized in that: the straight electric capacity of described filter is connected with the reverse input end of amplifying circuit by the 3rd resistance R 3, is provided with feedback resistance R4 between the output terminal of described amplifying circuit and amplifying circuit.
5. metering sampling A/D chip according to claim 1 and the sample circuit of built-in AD to same passage, is characterized in that: in described amplifying circuit, be provided with AD8608AR operational amplifier.
6. metering sampling A/D chip according to claim 1 and the sample circuit of built-in AD to same passage, is characterized in that: the model of described metering sampling A/D chip is ATT7022 computation chip.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420302337.3U CN204008832U (en) | 2014-06-09 | 2014-06-09 | A kind of sampling A/D chip and the sample circuit of built-in AD to same passage of measuring |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420302337.3U CN204008832U (en) | 2014-06-09 | 2014-06-09 | A kind of sampling A/D chip and the sample circuit of built-in AD to same passage of measuring |
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| CN204008832U true CN204008832U (en) | 2014-12-10 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111157783A (en) * | 2019-12-28 | 2020-05-15 | 杭州拓深科技有限公司 | Control system for common acquisition of differential signal and waveform data |
| CN111426873A (en) * | 2020-05-13 | 2020-07-17 | 南京海兴电网技术有限公司 | Electronic AC sensor sampling and metering circuit |
| WO2021184695A1 (en) * | 2020-03-20 | 2021-09-23 | 威胜信息技术股份有限公司 | High-precision direct-current electric energy testing apparatus and method |
-
2014
- 2014-06-09 CN CN201420302337.3U patent/CN204008832U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111157783A (en) * | 2019-12-28 | 2020-05-15 | 杭州拓深科技有限公司 | Control system for common acquisition of differential signal and waveform data |
| WO2021184695A1 (en) * | 2020-03-20 | 2021-09-23 | 威胜信息技术股份有限公司 | High-precision direct-current electric energy testing apparatus and method |
| CN111426873A (en) * | 2020-05-13 | 2020-07-17 | 南京海兴电网技术有限公司 | Electronic AC sensor sampling and metering circuit |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141210 |
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| CF01 | Termination of patent right due to non-payment of annual fee |