CN206331038U - Electric energy metering circuit of single-phase intelligent electric meter - Google Patents
Electric energy metering circuit of single-phase intelligent electric meter Download PDFInfo
- Publication number
- CN206331038U CN206331038U CN201621336760.0U CN201621336760U CN206331038U CN 206331038 U CN206331038 U CN 206331038U CN 201621336760 U CN201621336760 U CN 201621336760U CN 206331038 U CN206331038 U CN 206331038U
- Authority
- CN
- China
- Prior art keywords
- circuit
- resistance
- electric capacity
- sampling circuit
- metering
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000005070 sampling Methods 0.000 claims abstract description 31
- 238000002955 isolation Methods 0.000 claims description 5
- 230000005611 electricity Effects 0.000 claims description 4
- 239000003990 capacitor Substances 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 3
- 238000012795 verification Methods 0.000 description 3
- 101001074567 Chamaecyparis formosensis Alpha pinene synthase, chloroplastic Proteins 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 241001274660 Modulus Species 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The utility model discloses a single-phase smart electric meter's electric energy measurement circuit, including current sampling circuit, voltage sampling circuit, metering circuit and pulse output circuit, current sampling circuit, voltage sampling circuit and pulse output circuit all are connected with the metering circuit, current sampling circuit includes shunt and sampling circuit, sampling circuit includes resistance, electric capacity and electric capacity, positive input is connected to the one end of resistance, and the other end is connected with the shunt, the negative input is connected to the one end of resistance, and the other end is connected with the shunt, electric capacity one end is connected with positive input, and the other end passes through electric capacity and is connected with the negative input, the junction of electric capacity and electric capacity still ground connection, voltage sampling circuit adopts the voltage sampling circuit of check-up decay network type. The utility model discloses a circuit structure is simple, detect the convenient and precision of measurement is high.
Description
Technical field
The utility model is related to intelligent electric meter technical field, more specifically, more particularly to a kind of single-phase intelligent ammeter
Ic for energy metering.
Background technology
Intelligent electric meter is based on MCU computation chip technologies, using current newest integrated circuit technique, according to electric energy meter
About international (IEC) standard and China electric power standard GB/T17215.301-2007《Multifunctional electric energy meter-particular/special requirement》、GB/
T15284-2002《Multi-rate electric energy meter-particular/special requirement》、DL/T614-2007《Multifunctional electric energy meter》、DL/T645-2007《It is many
Function electric energy meter communication protocol》、Q/GDW354-2009《Intelligent electric energy meter functional specification》、Q/GDW356-2009《Three-phase intelligent
Electric energy meter pattern specification》Etc. the ammeter manufactured and designed, including three-phase intelligent ammeter and single-phase intelligent ammeter.
At present for single-phase intelligent ammeter, influenceed by electric current, voltage detecting precision, how to design a kind of structure
Simply, ic for energy metering easy to detect and high measuring accuracy is necessary.
Utility model content
The purpose of this utility model is to provide a kind of electric energy metrical of single-phase intelligent ammeter simple in construction, easy to detect
Circuit.
In order to achieve the above object, the technical solution adopted in the utility model is as follows：
A kind of ic for energy metering of single-phase intelligent ammeter, including current sampling circuit, voltage sampling circuit, metering circuit
And impulse output circuit, the current sampling circuit, voltage sampling circuit and impulse output circuit be connected with metering circuit, institute
Stating current sampling circuit includes current divider and sample circuit, and the sample circuit includes resistance, resistance, electric capacity and electric capacity, described
One end connection positive input terminal of resistance, the other end be connected with current divider, and one end of the resistance connects negative input end, the other end and
Current divider is connected, and described electric capacity one end is connected with positive input terminal, and the other end is connected by electric capacity with negative input end, the electric capacity with
The junction of electric capacity is also grounded, and the voltage sampling circuit is using the voltage sampling circuit for verifying attenuation network type.
Further, the impulse output circuit includes resistance, pulse indicator lamp, isolation optocoupler and decoupling capacitance, described
One end of resistance is connected with metering circuit, and the other end is connected with the negative pole of pulse indicator lamp, the positive pole and optocoupler of pulse indicator lamp
Input cathode connection, optocoupler input anode ground connection, the output end colelctor electrode connection+5V power supplys of optocoupler, decoupling capacitance
It is in parallel with pulse indicator lamp.
Further, the metering circuit uses ADE7755 computation chips.
Compared with prior art, the utility model has the advantage of：Circuit structure of the present utility model is simple, easy to detect
And the high precision of metering.
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
Or the accompanying drawing to be used needed for description of the prior art is briefly described, it should be apparent that, drawings in the following description are only
It is some embodiments of the present utility model, for those of ordinary skill in the art, is not paying the premise of creative work
Under, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the circuit diagram of the ic for energy metering of single-phase intelligent ammeter described in the utility model.
Embodiment
Preferred embodiment of the present utility model is described in detail below in conjunction with the accompanying drawings, so that advantage of the present utility model
It can be easier to be readily appreciated by one skilled in the art with feature, so as to make protection domain of the present utility model apparent clear and definite
Define.
Refering to shown in Fig. 1, the utility model provides a kind of ic for energy metering of single-phase intelligent ammeter, including current sample
Circuit 1, voltage sampling circuit 2, metering circuit 3 and impulse output circuit 4.
The current sampling circuit 1, voltage sampling circuit 2 and impulse output circuit 4 are connected with metering circuit 3, described
Current sampling circuit 1 includes current divider and sample circuit, and the sample circuit includes resistance R56, resistance R57, electric capacity C21 and electricity
Hold C22, one end connection positive input terminal of the resistance R56, the other end is connected with current divider, one end connection of the resistance R57
Negative input end, the other end is connected with current divider, and described electric capacity C21 one end is connected with positive input terminal, the other end by electric capacity C22 with
Negative input end is connected, and the junction of the electric capacity C21 and electric capacity C22 are also grounded.
Wherein resistance R56, resistance R57 are sampling resistor, and electric capacity C21, electric capacity C22 are sampling capacitance, are that sampling channel is carried
Sampled voltage signal is supplied, the size of sampled voltage signal is determined by the resistance of current divider with the electric current flowed through thereon.Electric current is adopted
Sample passage is using complete differential input, and V1P is positive input terminal, and V2P is negative input end, current sample passage maximum differential peak value electricity
Pressure should be less than 470mV, and its gain of the PGA of current sample passage can be selected by ADE7755 G1 and G0.
The voltage sampling circuit 2 is using the voltage sampling circuit for verifying attenuation network type.
The sampled signal of control source passage is obtained by the line voltage that decays, wherein resistance R11, resistance R13, resistance
R47~R49, resistance R55, resistance R60, resistance R75~R78, resistance R80, resistance R81 are verification attenuation network, pass through short circuit
Wire jumper S5 to S13 can be by sampled signal regulation to the sampled value of needs, and when electric energy meter is fundamental current, voltage sample value is
The error of a reference source 8% in 174.2mV, the tolerance and piece in order to allow current divider, decay verification network should allow at least
30% verification scope.- 3dB the frequencies of this attenuation network are determined by resistance R80 and electric capacity C33, resistance R54, resistance
R73, resistance R74 ensure that this point, even if whole wire jumper is all connected, resistance R54, resistance R73, resistance R74 resistance value still
It is far longer than resistance R80.
Choosing for resistance R80 and electric capacity C33 will be matched with resistance R57, the electric capacity C21 of current sample passage, such ability
Ensure that the phase of two passages carries out appropriate matching, eliminate the error influence that phase detuning is brought.
The impulse output circuit 4 includes resistance R59, pulse indicator lamp D9, isolation optocoupler U1 and decoupling capacitance C28, institute
The one end for stating resistance R59 is connected with metering circuit 3, and the other end is connected with pulse indicator lamp D9 negative pole, pulse indicator lamp D9's
Positive pole is connected with optocoupler U1 input cathode, optocoupler U1 input anode ground connection, and optocoupler U1 output end colelctor electrode connection+
5V power supplys, decoupling capacitance C28 is in parallel with pulse indicator lamp D9.
Resistance R59 is current-limiting resistance, and when examining, the signal that can be sent with conventional photo method acquisition pulse indicator lamp is carried out
Error checking, decoupling capacitor C28, it is the influence for filtering high-frequency interferencing signal to LED that it, which acts on one, and two be in hot and humid environment
Under, the interference signal to the input pin for the isolation optocoupler U1 that is added to plays a part of a discharge path, prevents isolation optocoupler
U1 misleads.
Preferably, the metering circuit 3 uses ADE7755 computation chips.ADE7755 uses+5V, power consumption 15mV list
Power supply is powered, after power-up, and ADE7755 chips are started working after being initialised, and the signal of current channel and voltage channel is amplified
After device amplification, two ways of digital signals is converted to by internal analog-digital converter.When carrying out power measurement, current path signal
Also need to by high-pass filter to remove the direct current biasing in passage, may now cause the phase of two passages inconsistent, it is right
This, can be compensated by phase-adjusting circuit to phase angle change amount, and two paths of signals then is added into digital multiplier simultaneously, then
By low pass filter, finally enter numeral/frequency converter, obtain the high-frequency impulse proportional to instantaneous power and with it is average
The proportional low-frequency pulse of power, and exported respectively at CF, F1, F2 end, obtained from power network sampling on voltage signal feeding passage 2
V2P and V2N after, digital analog converter is directly entered, subsequently into multiplier to provide 2 moduluses in power calculation, chip
Converter shares 1 2.5V reference power supply.
Operation principle of the present utility model is, first load current by current divider again by filter circuit after be converted into closing
Suitable voltage signal is sent to electric energy computation chip ADE7755 current channel, i.e. V1P and V1N ends；And 220V phase voltages are then led to
Cross after the step-down of precision resistance attenuation network, then electric energy computation chip ADE7755 voltage channel is sent into by filter circuit, i.e.,
Both V2P and V2N ends are converted into active power by ADE7755 and are exported in high-frequency impulse form from CF ends and then be linked into monolithic
Machine AT89C52 external interrupt signal input, i.e. single chip machine controlling circuit pass through processing from ADE7755 CF ends acquisition pulse
The data obtained afterwards are sent to LCD display circuit and shown, and transfer data to host computer by long-distance communication circuit.CF pin
It is connected on through photoelectrical coupler on the T0 counters of single-chip microcomputer, the pulse exported by single-chip microcomputer to CF pin is counted, further according to
ADE7755 principle, calculates power institute power scale.
Metering circuit structure of the present utility model it is by a relatively simple, easy to detect and metering high precision.
Although being described in conjunction with the accompanying embodiment of the present utility model, patent owner can want in appended right
Various deformations or amendments are made within the scope of asking, as long as no more than the protection model described by claim of the present utility model
Enclose, all should be within protection domain of the present utility model.
Claims (3)
1. a kind of ic for energy metering of single-phase intelligent ammeter, it is characterised in that：Including current sampling circuit, voltage sample electricity
Road, metering circuit and impulse output circuit, the current sampling circuit, voltage sampling circuit and impulse output circuit with metering
Circuit is connected, and the current sampling circuit includes current divider and sample circuit, and the sample circuit includes resistance, resistance, electric capacity
And electric capacity, one end connection positive input terminal of the resistance, the other end is connected with current divider, and one end of the resistance connects negative input
End, the other end is connected with current divider, and described electric capacity one end is connected with positive input terminal, and the other end is connected by electric capacity and negative input end
Connect, the junction of the electric capacity and electric capacity is also grounded, the voltage sampling circuit is using the voltage sample for verifying attenuation network type
Circuit.
2. the ic for energy metering of single-phase intelligent ammeter according to claim 1, it is characterised in that：The pulse output electricity
Road includes resistance, pulse indicator lamp, isolation optocoupler and decoupling capacitor, and one end of the resistance is connected with metering circuit, the other end
It is connected with the negative pole of pulse indicator lamp, the positive pole of pulse indicator lamp and the input cathode of optocoupler are connected, the input of optocoupler is rectified
Pole is grounded, and the output end colelctor electrode connection+5V power supplys of optocoupler, decoupling capacitor is in parallel with pulse indicator lamp.
3. the ic for energy metering of single-phase intelligent ammeter according to claim 1, it is characterised in that：The metering circuit is adopted
Use ADE7755 computation chips.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621336760.0U CN206331038U (en) | 2016-12-07 | 2016-12-07 | Electric energy metering circuit of single-phase intelligent electric meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621336760.0U CN206331038U (en) | 2016-12-07 | 2016-12-07 | Electric energy metering circuit of single-phase intelligent electric meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206331038U true CN206331038U (en) | 2017-07-14 |
Family
ID=59289658
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621336760.0U Active CN206331038U (en) | 2016-12-07 | 2016-12-07 | Electric energy metering circuit of single-phase intelligent electric meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206331038U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111413541A (en) * | 2020-04-22 | 2020-07-14 | 上海国泉科技有限公司 | Metering circuit of ammeter and ammeter |
| CN113834969A (en) * | 2021-08-12 | 2021-12-24 | 国网浙江省电力有限公司营销服务中心 | Direct access type direct current electric energy meter |
| CN114545076A (en) * | 2022-02-28 | 2022-05-27 | 无锡市恒通电器有限公司 | Single-phase guide rail type intelligent electric energy meter supporting index management |
-
2016
- 2016-12-07 CN CN201621336760.0U patent/CN206331038U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111413541A (en) * | 2020-04-22 | 2020-07-14 | 上海国泉科技有限公司 | Metering circuit of ammeter and ammeter |
| CN113834969A (en) * | 2021-08-12 | 2021-12-24 | 国网浙江省电力有限公司营销服务中心 | Direct access type direct current electric energy meter |
| CN114545076A (en) * | 2022-02-28 | 2022-05-27 | 无锡市恒通电器有限公司 | Single-phase guide rail type intelligent electric energy meter supporting index management |
| CN114545076B (en) * | 2022-02-28 | 2023-12-05 | 无锡市恒通电器有限公司 | Single-phase guide rail type intelligent electric energy meter supporting index management |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104569902B (en) | Digital type electric energy meter power consumption measuring device and method | |
| CN202794334U (en) | Wide-range direct current standard electric energy meter | |
| CN204008845U (en) | A kind of single-phase electric energy meter metering circuit | |
| CN206331038U (en) | Electric energy metering circuit of single-phase intelligent electric meter | |
| CN104330621A (en) | Electric appliance energy consumption tester | |
| CN202372569U (en) | Power parameter measuring device | |
| CN207164235U (en) | A kind of power consumption test unit of electric energy meter communication module | |
| CN208636355U (en) | SCM Based single-phase double copper-manganese anti-electricity-theft electric energy meters | |
| CN204758693U (en) | A electrical measurement device for building intelligent electric system of using | |
| CN204439712U (en) | Based on the hollow coil current transformer of Novel DC negative feedback integrator | |
| CN114744777A (en) | Passive surface-mounted current measurement wireless micro-power consumption sensing system | |
| CN2754103Y (en) | Illegal-use-proof electric-energy meter capable of monitoring CT state | |
| CN206331037U (en) | Three-phase self-adaptation smart electric meter | |
| CN105091962A (en) | Low-power-consumption electromagnetic flow converter | |
| CN203433041U (en) | An electric energy meter provided with a communication function | |
| CN204556810U (en) | A kind of calibration information harvester of intelligent electric power multifunctional meter | |
| CN205958641U (en) | Current detection circuit | |
| CN202393824U (en) | Arrester signal acquisition device for protecting series compensation capacitor | |
| CN104977465B (en) | remote electrical parameter measuring system | |
| CN204203382U (en) | The uneven remote monitoring circuit of threephase load | |
| CN103487626A (en) | Measuring circuit | |
| CN201637780U (en) | Single-phase electronic dual-loop electric energy meter | |
| CN202362363U (en) | Wide range single-phase electric energy meter | |
| CN107102201A (en) | A kind of integrated high-pressure electric power meter | |
| CN203909130U (en) | High precision multipath AC current true virtual value detection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |