CN202330551U - Metering circuit of single-phase three-wire keyboard electric energy meter - Google Patents

Metering circuit of single-phase three-wire keyboard electric energy meter Download PDF

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Publication number
CN202330551U
CN202330551U CN2011204830446U CN201120483044U CN202330551U CN 202330551 U CN202330551 U CN 202330551U CN 2011204830446 U CN2011204830446 U CN 2011204830446U CN 201120483044 U CN201120483044 U CN 201120483044U CN 202330551 U CN202330551 U CN 202330551U
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China
Prior art keywords
circuit
phase
electric energy
current transformer
metering
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Active
Application number
CN2011204830446U
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Chinese (zh)
Inventor
贾燕生
龙志进
马超
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Wasion Group Co Ltd
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Wasion Group Co Ltd
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Priority to CN2011204830446U priority Critical patent/CN202330551U/en
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Publication of CN202330551U publication Critical patent/CN202330551U/en
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Abstract

The utility model provides a single-phase three-wire metering circuit of a keyboard electric energy meter. The single-phase three-wire metering circuit comprises an intra-meter singlechip, a CT (Current Transformer) and a metering chip, wherein two live wires L1 and L2 share one CT and one metering chip; a secondary output lead of the CT is connected with the metering chip through a matching and anti-aliasing filter circuit; the two live wires pass through the same CT; and the two live wires pass through the CT along opposite directions, an isolation circuit is not needed any more, and components used by the whole circuit is reduced by a half, so that the volume is also reduced, the PCB (Printed Circuit Board) layout is more convenient, and the cost is also lowered; and in addition, the CT is adopted, so that under the condition of a heavy current, heating is reduced, the increase of intra-meter temperature is not high, the components are not easily be subjected to ageing failure, the reliability of the electric energy meter is improved, simultaneously, the precision is also relatively stable, and the procedure also can be concise and stable.

Description

The metering circuit of single-phase three-wire keyboard table
Technical field
The utility model relates to a kind of metering circuit of keyboard prepayment meter.
Background technology
Along with the requirement of power department for the management of power use improves day by day; Each Development and Production manufacturer has constantly released new the intelligent electric energy meter; The keyboard-type prepayment meter has obtained increasing application, and in the area that single-phase keyboard-type prepayment meter uses, power supply mode is single-phase three-wire a bit; Two live wires get into ammeter, and corresponding continuous data all will be analyzed, record.
In order to satisfy this application scenario; Some electric energy meter exploitation, manufacturing enterprise have released the electric energy meter that can adapt to this metering method; Schematic block circuit diagram is seen shown in Figure 2, and sort circuit mainly is to have adopted two cover metering circuits, the voltage and current of sample respectively two-way live wire L1 and L2; Carry out computing through each self-corresponding computation chip, in single-chip microcomputer, carry out subsequent analysis, record again.But sort circuit has certain limitation, needs buffer circuit, and the components and parts that whole metering circuit uses are more; Volume is bigger, and cost is also higher, in addition because adopted copper-manganese; Therefore heating easily under big electric current, it is too high to cause showing interior temperature rise, and the components and parts easy ageing lost efficacy; Reduced the ammeter reliability, precision is also drifted about easily simultaneously.
The utility model content
The purpose of the utility model is to the deficiency of existing electric energy meter for the single-phase three-wire metering, provides a kind of and can effectively reduce cost, improve the ammeter measuring accuracy, prolongs the metering circuit of the single-phase three-wire keyboard table in components and parts serviceable life.
The metering circuit of this single-phase three-wire keyboard table that the utility model provides; Comprise single-chip microcomputer, computation chip in the table; Also comprise a current transformer CT, coupling and anti-aliasing filter circuit; The two-way live wire of being sampled penetrates said current transformer CT with opposite direction, and the secondary output lead of current transformer is connected with computation chip with the anti-aliasing filter circuit through coupling.
The utility model compared with prior art no longer needs buffer circuit, and the components and parts that entire circuit is used have reduced a greater part of, and volume has also reduced; The PCB layout is convenient, and cost has also reduced, in addition because adopted current transformer CT; Under big electric current, heating has reduced, and temperature rise is not high in the table; Components and parts are not easy ageing failure, have improved the ammeter reliability, and precision is also more stable simultaneously.
Description of drawings
Fig. 1 is the schematic block circuit diagram of the utility model single-phase three-wire metering.
Fig. 2 is the schematic block circuit diagram of existing electric energy meter single-phase three-wire metering.
Embodiment
Can know from Fig. 1; The utility model single-phase three-wire metering circuit comprises single-chip microcomputer, current transformer CT, computation chip in the table; Shared same current transformer CT of two-way live wire L1 and L2 and computation chip, the secondary output lead of current transformer is connected with computation chip.The two-way live wire all passes same current transformer CT, and the two-way live wire passes the in the opposite direction of current transformer CT.The current sampling signal of current transformer CT is input to computation chip through coupling and anti-aliasing filter circuit, and single-chip microcomputer reads, writes down each continuous data through computation chip.
The concrete working method of the utility model is following:
Two-way live wire L1 and L2 receive on the corresponding primary input terminal of electric energy meter, and live wire L2 penetrates from the back of current transformer CT, pass from the front of current transformer CT, receive on the corresponding main lead-out terminal of electric energy meter again.Live wire L1 also passes current transformer CT, but the threading direction is just in time opposite with L2, and L1 penetrates from the front of current transformer CT, passes from the back of current transformer CT, receives on the corresponding main lead-out terminal of electric energy meter again.The electric current phase place when current transformer CT superposition that has so just guaranteed the two-way live wire is identical; Receive coupling and the anti-aliasing filter circuit of current transformer CT through the secondary output lead of current transformer CT; Get into the current sample input end of computation chip U102 afterwards; The voltage signal of two-way live wire L1 and L2 gets into the voltage sample input end of computation chip U102 through voltage sampling circuit; Computation chip U102 carries out high-speed computation to the voltage and current signal of input again, produces relevant continuous data, and the output terminal of computation chip U102 no longer needs buffer circuit; Can directly receive the interrupting input end mouth P102 of single-chip microcomputer, single-chip microcomputer and then can carry out pulse analysis and computing such as add up.Because no longer need two interrupting input end mouths, program also can simplify, stablize in addition.

Claims (2)

1. the metering circuit of a single-phase three-wire keyboard table; Comprise single-chip microcomputer, computation chip in the table; It is characterized in that also comprising a current transformer CT, coupling and anti-aliasing filter circuit; The two-way live wire of being sampled penetrates said current transformer CT with opposite direction, and the secondary output lead of current transformer is connected with computation chip with the anti-aliasing filter circuit through coupling.
2. the metering circuit of single-phase three-wire keyboard table according to claim 1 is characterized in that the current sampling signal of current transformer is input to computation chip through coupling and anti-aliasing filter circuit, and single-chip microcomputer reads, writes down each continuous data through computation chip.
CN2011204830446U 2011-11-29 2011-11-29 Metering circuit of single-phase three-wire keyboard electric energy meter Active CN202330551U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2011204830446U CN202330551U (en) 2011-11-29 2011-11-29 Metering circuit of single-phase three-wire keyboard electric energy meter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2011204830446U CN202330551U (en) 2011-11-29 2011-11-29 Metering circuit of single-phase three-wire keyboard electric energy meter

Publications (1)

Publication Number Publication Date
CN202330551U true CN202330551U (en) 2012-07-11

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN2011204830446U Active CN202330551U (en) 2011-11-29 2011-11-29 Metering circuit of single-phase three-wire keyboard electric energy meter

Country Status (1)

Country Link
CN (1) CN202330551U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102809678A (en) * 2012-08-03 2012-12-05 江苏林洋电子股份有限公司 Device for improving current sampling linear range and electric energy measuring accuracy of electric energy meter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102809678A (en) * 2012-08-03 2012-12-05 江苏林洋电子股份有限公司 Device for improving current sampling linear range and electric energy measuring accuracy of electric energy meter
CN102809678B (en) * 2012-08-03 2014-07-23 江苏林洋电子股份有限公司 Device for improving current sampling linear range and electric energy measuring accuracy of electric energy meter

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