CN111426873A - Electronic AC sensor sampling and metering circuit - Google Patents
Electronic AC sensor sampling and metering circuit Download PDFInfo
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- CN111426873A CN111426873A CN202010405071.5A CN202010405071A CN111426873A CN 111426873 A CN111426873 A CN 111426873A CN 202010405071 A CN202010405071 A CN 202010405071A CN 111426873 A CN111426873 A CN 111426873A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2506—Arrangements for conditioning or analysing measured signals, e.g. for indicating peak values ; Details concerning sampling, digitizing or waveform capturing
- G01R19/2509—Details concerning sampling, digitizing or waveform capturing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/30—Structural combination of electric measuring instruments with basic electronic circuits, e.g. with amplifier
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/04—Voltage dividers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/142—Arrangements for simultaneous measurements of several parameters employing techniques covered by groups G01R15/14 - G01R15/26
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
- G01R22/10—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods using digital techniques
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The invention discloses an electronic type alternating current sensor sampling and metering circuit, which comprises a signal isolation, amplification and sampling circuit, a signal reduction, following and metering circuit, an AD chip and a metering chip, wherein the signal isolation, amplification and sampling circuit is connected with the signal reduction, following and metering circuit; the signal isolation amplification sampling circuit amplifies a small-amplitude alternating current signal output by an external electronic sensor into an intermediate signal within rated AC7V, and the intermediate signal is acquired through an AD chip; the intermediate signal is reduced to within the rated AC0.5V by the signal reduction following metering circuit pair, and the alternating current signal obtained by the electronic alternating current sensor is measured by the metering chip. The sampling metering circuit designed by the invention improves the metering precision, meets the precision requirement of a sampling chip and can finish the accurate metering of the power parameters.
Description
Technical Field
The invention relates to a signal measuring circuit, in particular to an electronic type alternating current sensor sampling and metering circuit.
Background
In recent years, the distribution network primary and secondary fusion technology is rapidly developed, an electronic alternating current sensor is gradually replaced in a primary switch, an output alternating current signal is reduced to be within 5V, but the existing alternating current sampling circuits of secondary terminals are all suitable for AC220V voltage and AC5A current levels, the power consumption of the existing circuits is high, and the accuracy requirement of the electronic alternating current sensor cannot be met.
Disclosure of Invention
The purpose of the invention is as follows: in order to solve the above problems, the present invention provides a high-precision electronic ac sensor sampling and metering circuit, which can be used in conjunction with an electronic ac sensor to realize sampling and accurate metering of power parameters.
The technical scheme is as follows: the technical scheme adopted by the invention is an electronic type alternating current sensor sampling and metering circuit, which is used for sampling and metering signals of an electronic type alternating current sensor and comprises a signal isolation, amplification and sampling circuit, a signal reduction, following and metering circuit, an AD chip and a metering chip; the signal isolation amplification sampling circuit amplifies a small-amplitude alternating current signal output by an external electronic sensor into an intermediate signal within rated AC7V, and the intermediate signal is acquired through an AD chip; the intermediate signal is reduced to within the rated AC0.5V by the signal reduction following metering circuit pair, and the alternating current signal obtained by the electronic alternating current sensor is measured by the metering chip.
The signal isolation amplification sampling circuit comprises a voltage converter, an operational amplifier and a resistor, wherein the input end of the voltage converter is connected with the output end of an external electronic sensor, the output end of the voltage converter is connected with the first input end of the operational amplifier through a first resistor, the second input end of the operational amplifier is grounded through a second resistor, a third resistor is connected between the second input end of the operational amplifier and the output end of the operational amplifier, and the output end of the operational amplifier is the output of the signal isolation amplification sampling circuit.
Preferably, the voltage converter transformation ratio is 3.25V/3.25V. The resistance values of the first resistor, the second resistor and the third resistor are all 1k omega level. The model of the operational amplifier U1 adopts SGM8270, the model of the AD chip IC1 adopts AD7606, and the model of the voltage converter adopts TR11116-1 CA.
The utility model provides a scheme of signal is dwindled and is followed measurement circuit is, including fourth resistance, fifth resistance and voltage follower, the first input of voltage follower pass through the fourth resistance with the output of signal isolation amplification sampling circuit links to each other, the first input of voltage follower passes through fifth resistance ground connection, the second input of voltage follower and its output short circuit, the output of voltage follower does the output of signal is dwindled and is followed measurement circuit.
In order to ensure high precision of the metering circuit, the model of the metering chip adopts ATT 7022.
Preferably, the fourth resistor and the fifth resistor have resistance values of 10k Ω. The voltage follower is model SGM 8270.
Has the advantages that: compared with the prior art, the invention has the following advantages: (1) according to the invention, a small-amplitude alternating current signal output by an external electronic sensor is amplified to be within a rated AC7V through an isolation amplifying circuit, and then is reduced to be within a rated AC0.5V through resistance voltage division, so that the metering precision is improved, and meanwhile, the precision requirement of a sampling chip is met; (2) the impedance is increased through the voltage follower, and the output impedance of the front stage is not influenced; (3) a unique three-phase electric energy metering chip ATT7022 is used as the core of a signal metering part, and the advantages of high precision and multiple functions are fully utilized to finish accurate metering of electric parameters.
Drawings
FIG. 1 is a circuit diagram of an electronic AC sensor sampling and metering circuit according to the present invention.
Detailed Description
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
The sampling and metering circuit of the electronic alternating current sensor disclosed by the invention is shown in figure 1 and mainly comprises a signal isolation, amplification and sampling circuit, a signal reduction, following and metering circuit, an AD chip and a metering chip. The signal isolation amplification sampling circuit amplifies a small-amplitude alternating current signal output by an external electronic sensor into an intermediate signal within a rated AC7V range, the intermediate signal is collected by an AD chip for subsequent analysis, the intermediate signal is reduced to within a rated AC0.5V range by a signal reduction following metering circuit, and the alternating current signal obtained by the electronic alternating current sensor is measured by the metering chip.
The signal isolation amplification sampling circuit isolates a small-amplitude alternating current signal output by an external electronic sensor through a voltage converter T1 and amplifies the small-amplitude alternating current signal to be within rated AC7V through an operational amplifier U1. The signal isolation amplification sampling circuit comprises a voltage converter T1, a first resistor R1, a second resistor R2, a third resistor R3 and an operational amplifier U1, and output signals of the signal isolation amplification sampling circuit are acquired through an AD chip IC 1. The input end of the voltage converter T1 is connected with the output end of an external electronic sensor, the output end of the voltage converter T1 is connected with the first input end (anode) of the operational amplifier U1 through a first resistor R1, the second input end (cathode) of the operational amplifier U1 is grounded through a second resistor R2, and a third resistor R3 is connected between the second input end (cathode) of the operational amplifier U1 and the output end of the operational amplifier U1.
The voltage converter T1 is used for converting an external electronic AC voltage signal uiIsolated from the internal circuitry. The ratio of the resistance of the first resistor R1 is related to the signal amplification factor. The transformation ratio of the voltage converter T1 is 3.25V/3.25V, the model is TR11116-1CA, and the resistance values of the first resistor R1, the second resistor R2 and the third resistor R3 are all 1k omega level. The signal is amplified by 1+ R3/R2 times through a first resistor R1, a second resistor R2, a third resistor R3 and an operational amplifier U1 to obtain a signal Uo1。uo1And the measurement range of the AD chip is met. In this embodiment, the operational amplifier U1 is of model SGM8270, and the AD chip IC1 is of model AD 7606.
The signal reduction following metering circuit comprises a fourth resistor R4, a fifth resistor R5 and a voltage follower U2. The first input end (positive pole) of the voltage follower U2 is connected with the output of the preceding stage circuit through a fourth resistor R4, the first input end (positive pole) of the voltage follower U2 is grounded through a fifth resistor R5, and the second input end (negative pole) of the voltage follower U2 is in short circuit with the output end of the voltage follower U2. The signal reduction following metering circuit firstly reduces the front-stage alternating current signal uo1 by the times of R5/(R4+ R5) through a fourth resistor R4, a fifth resistor R5 and a voltage follower U2 to obtain uo2, reduces the signal to be within AC0.5V of rated value, and meters power parameters through a three-phase power metering chip ATT7022 series. The signal uo2 is matched with the measurement range of the measurement chip IC2, and the signal reduction following measurement circuit does not affect the output impedance of the front stage. The resistance values of the fourth resistor R4 and the fifth resistor R5 are both 10k omega levels, and the model of the voltage follower U2 adopts SGM 8270.
Claims (9)
1. The utility model provides an electronic type interchange sensor sampling and measurement circuit for sampling and measurement of electronic type interchange sensor signal which characterized in that: the device comprises a signal isolation, amplification and sampling circuit, a signal reduction, following and metering circuit, an AD chip and a metering chip; the signal isolation amplification sampling circuit amplifies a small-amplitude alternating current signal output by an external electronic sensor into an intermediate signal within rated AC7V, and the intermediate signal is acquired through an AD chip; the intermediate signal is reduced to within the rated AC0.5V by the signal reduction following metering circuit pair, and the alternating current signal obtained by the electronic alternating current sensor is measured by the metering chip.
2. The electronic ac sensor sampling and metering circuit of claim 1, wherein: the signal isolation amplification sampling circuit comprises a voltage converter, an operational amplifier and a resistor, wherein the input end of the voltage converter is connected with the output end of an external electronic sensor, the output end of the voltage converter is connected with the first input end of the operational amplifier through a first resistor, the second input end of the operational amplifier is grounded through a second resistor, a third resistor is connected between the second input end of the operational amplifier and the output end of the operational amplifier, and the output end of the operational amplifier is the output of the signal isolation amplification sampling circuit.
3. The electronic ac sensor sampling and metering circuit of claim 2, wherein the voltage converter transformation ratio is 3.25V/3.25V.
4. The electronic ac sensor sampling and metering circuit of claim 2, wherein: the resistance values of the first resistor, the second resistor and the third resistor are all 1k omega level.
5. The electronic ac sensor sampling and metering circuit of claim 2, wherein: the model of the operational amplifier U1 adopts SGM8270, the model of the AD chip IC1 adopts AD7606, and the model of the voltage converter adopts TR11116-1 CA.
6. The electronic ac sensor sampling and metering circuit of claim 1, wherein: the signal reduction following metering circuit comprises a fourth resistor, a fifth resistor and a voltage follower, wherein a first input end of the voltage follower is connected with the output of the signal isolation amplification sampling circuit through the fourth resistor, a first input end of the voltage follower is grounded through the fifth resistor, a second input end of the voltage follower is in short circuit with an output end of the voltage follower, and the output end of the voltage follower is used for outputting the signal reduction following metering circuit.
7. The electronic ac sensor sampling and metering circuit of claim 6, wherein: the model of the metering chip adopts ATT 7022.
8. The electronic ac sensor sampling and metering circuit of claim 6, wherein: the resistance values of the fourth resistor and the fifth resistor are both 10k omega levels.
9. The electronic ac sensor sampling and metering circuit of claim 6, wherein: the voltage follower is model SGM 8270.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010405071.5A CN111426873A (en) | 2020-05-13 | 2020-05-13 | Electronic AC sensor sampling and metering circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010405071.5A CN111426873A (en) | 2020-05-13 | 2020-05-13 | Electronic AC sensor sampling and metering circuit |
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| CN111426873A true CN111426873A (en) | 2020-07-17 |
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| CN202010405071.5A Pending CN111426873A (en) | 2020-05-13 | 2020-05-13 | Electronic AC sensor sampling and metering circuit |
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Citations (11)
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|---|---|---|---|---|
| US4876502A (en) * | 1988-05-09 | 1989-10-24 | Westinghouse Electric Corp. | Wide dynamic range current measuring apparatus |
| CN201233423Y (en) * | 2008-07-29 | 2009-05-06 | 奥豪斯仪器（上海）有限公司 | Electric network voltage detection device |
| CN204008832U (en) * | 2014-06-09 | 2014-12-10 | 南京丰道电力科技有限公司 | A kind of sampling A/D chip and the sample circuit of built-in AD to same passage of measuring |
| CN204374297U (en) * | 2015-02-10 | 2015-06-03 | 北京天诚同创电气有限公司 | Three-phase three-wire system voltage detecting circuit |
| CN205157636U (en) * | 2015-10-20 | 2016-04-13 | 佛山市和融数控软件有限公司 | Alternating current acquisition circuit that pottery mechanical equipment used |
| CN106817095A (en) * | 2017-02-23 | 2017-06-09 | 南京海兴电网技术有限公司 | A kind of small-signal isolated amplifier with self-calibration function |
| CN206709988U (en) * | 2017-03-07 | 2017-12-05 | 苏州汇川技术有限公司 | A kind of NTC motor temperatures sample circuit |
| CN207397025U (en) * | 2017-08-09 | 2018-05-22 | 广东技术师范学院 | A kind of safe patch board monitoring system |
| CN207650309U (en) * | 2017-12-27 | 2018-07-24 | 中山德著智能科技有限公司 | A kind of electric energy quality detection device |
| CN209342798U (en) * | 2018-12-12 | 2019-09-03 | 南宁职业技术学院 | A kind of voltage sampling apparatus |
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-
2020
- 2020-05-13 CN CN202010405071.5A patent/CN111426873A/en active Pending
Patent Citations (11)
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| US4876502A (en) * | 1988-05-09 | 1989-10-24 | Westinghouse Electric Corp. | Wide dynamic range current measuring apparatus |
| CN201233423Y (en) * | 2008-07-29 | 2009-05-06 | 奥豪斯仪器（上海）有限公司 | Electric network voltage detection device |
| CN204008832U (en) * | 2014-06-09 | 2014-12-10 | 南京丰道电力科技有限公司 | A kind of sampling A/D chip and the sample circuit of built-in AD to same passage of measuring |
| CN204374297U (en) * | 2015-02-10 | 2015-06-03 | 北京天诚同创电气有限公司 | Three-phase three-wire system voltage detecting circuit |
| CN205157636U (en) * | 2015-10-20 | 2016-04-13 | 佛山市和融数控软件有限公司 | Alternating current acquisition circuit that pottery mechanical equipment used |
| CN106817095A (en) * | 2017-02-23 | 2017-06-09 | 南京海兴电网技术有限公司 | A kind of small-signal isolated amplifier with self-calibration function |
| CN206709988U (en) * | 2017-03-07 | 2017-12-05 | 苏州汇川技术有限公司 | A kind of NTC motor temperatures sample circuit |
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| CN207650309U (en) * | 2017-12-27 | 2018-07-24 | 中山德著智能科技有限公司 | A kind of electric energy quality detection device |
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Application publication date: 20200717 |
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