CN208283460U - Electric energy meter - Google Patents
Electric energy meter Download PDFInfo
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- CN208283460U CN208283460U CN201820575561.8U CN201820575561U CN208283460U CN 208283460 U CN208283460 U CN 208283460U CN 201820575561 U CN201820575561 U CN 201820575561U CN 208283460 U CN208283460 U CN 208283460U
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- resistance
- sample circuit
- electric energy
- energy meter
- current divider
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- 238000005070 sampling Methods 0.000 claims abstract description 43
- 239000003990 capacitor Substances 0.000 claims description 14
- 230000005611 electricity Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 2
- 238000002788 crimping Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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Abstract
A kind of electric energy meter, including current divider and metering chip, including metering chip, current divider, and the current sampling circuit being connected between current divider and metering chip and the voltage sampling circuit being connected between power supply and metering chip；Voltage sampling circuit includes the first sample circuit and the second sample circuit, one end of first sample circuit and the second sample circuit is connect with third connecting terminal and the 4th connecting terminal respectively, the other end of first sample circuit and the second sample circuit connect with metering chip after being connected and passes through resistance R4 and is grounded, two terminals of current divider are connect with third connecting terminal and the 4th connecting terminal respectively, two sampling ends of current divider are connect with current sampling circuit respectively, even if making electric energy meter still in the case where electric energy meter reversal connection can be measured, it is simple with structure, high reliablity, feature at low cost.
Description
Technical field
The utility model relates to Low Voltage Electrical Apparatus, more particularly to a kind of electric energy meter.
Background technique
Electric energy meter is the instrument for measuring electric energy, and traditional electric energy meter voltage sampling plan is all using multiple electricity all the way
The mode of resistance partial pressure completes voltage sample, current sample be all using current divider, the low-pressure end of electric energy meter builtin voltage network and
Current channel is Equipotential network, so will lead to voltage short circuit in table when external electrical crimping is reversed, it is abnormally dangerous.
Summary of the invention
The purpose of the utility model is to overcome the defect of the prior art, provide that a kind of structure is simple, electricity of high reliablity
It can table.
To achieve the above object, the utility model adopts the technical scheme that
A kind of electric energy meter, including current divider and metering core in: including metering chip, current divider, and be connected to current divider
Current sampling circuit between metering chip and the voltage sampling circuit being connected between power supply and metering chip；Voltage sample
Circuit includes that one end of the first sample circuit I and the second sample circuit II, the first sample circuit I and the second sample circuit II is distinguished
With for connecting to power supply third connecting terminal 3 and the 4th connecting terminal 4 connect, the first sample circuit I and second sampling electricity
The other end of road II connect with metering chip after being connected and passes through resistance R4 and is grounded, two terminals of current divider respectively with third
Connecting terminal 3 and the connection of the 4th connecting terminal 4, two sampling ends of current divider are connect with current sampling circuit respectively.
Preferably, the current sampling circuit passes through two of the first connecting terminal 1 and the second connecting terminal 2 and current divider
Sampling end connection, is connected between first connecting terminal 1 and the second connecting terminal 2 by resistance R3, and the second terminals
The tie point of son 2 and resistance R3 is grounded.
Preferably, the first sample circuit I includes the resistance Ri of multiple series connections, the second sample circuit II packet
Include the resistance Rii of multiple series connections, the all-in resistance of the all-in resistance of the first sample circuit I and the second sample circuit II are equal.
Preferably, each resistance Ri is identical with the resistance value of each resistance Rii, the quantity of resistance Ri in the first sample circuit I
Equal to the quantity of resistance Rii in the second sample circuit II.
Preferably, the quantity of the resistance Ri and resistance Rii is 10.
Preferably, one end of the first sample circuit I and the second sample circuit II are connected by varistor RV.
Preferably, the current sampling circuit includes resistance R1 and resistance R2, one end of resistance R1 and resistance R2 respectively with
The other end of current divider connection, resistance R1 and resistance R2 are connect with metering chip respectively, and resistance R1 and resistance R2 and current divider connect
The one end connect is connected by resistance R3, and the tie point ground connection of resistance R2 and R3, and between resistance R1 and the resistance R2 other end
It is connected with capacitor C1 and capacitor C2, the tie point ground connection between capacitor C1 and capacitor C2.
Preferably, the current sampling circuit includes resistance R1 and resistance R2, and one end of resistance R1 and resistance R2 lead to respectively
Cross the first connecting terminal and the second connecting terminal connect with current divider, the other end of resistance R1 and resistance R2 respectively with metering chip
Connection.
The electric energy meter of the utility model, metering chip are connected to by the first sample circuit I and the second sample circuit II
On three connecting terminals 3 and the 4th connecting terminal 4, and two terminals of current divider are connected respectively to, if actually using
Conducting wire is reversed in journey, and the high-voltage end of current divider is connect with connecting terminal 4, and low-pressure end is connect with connecting terminal 3, then the first sampling
Circuit I is shorted, and the second sample circuit II is taken as sampling access access, since not only having for the second sample circuit II is certain
Resistance value, electric energy meter will not be burnt out when being shorted ensure that using safe, even if making electric energy meter in the case where electric energy meter reversal connection
It can still be measured, have the characteristics that structure simple, high reliablity, at low cost.
Detailed description of the invention
Fig. 1 is the wiring diagram of the utility model electric energy meter；
Fig. 2 is the circuit diagram of the utility model electric energy meter.
Specific embodiment
Below in conjunction with the embodiment that attached drawing 1 to 2 provides, the specific embodiment party of the electric energy meter of the utility model is further illustrated
Formula.The electric energy meter of the utility model is not limited to the following description.
As shown in Figs. 1-2, the electric energy meter of the utility model includes metering chip and current divider, and be connected to current divider with
Current sampling circuit between metering chip and the voltage sampling circuit being connected between power supply and metering chip, electric energy meter pass through
Third connecting terminal 3 and the 4th connecting terminal 4 connect to power supply.
Voltage sampling circuit includes the sampling of the first sample circuit I and the second sample circuit II, the first sample circuit I and second
One end of circuit I I respectively with for connecting to power supply third connecting terminal 3 and the 4th connecting terminal 4 connect, first sampling electricity
The other end of road I and the second sample circuit II connect with metering chip after being connected and pass through resistance R4 and is grounded, and two of current divider
Terminals are connect with third connecting terminal 3 and the 4th connecting terminal 4 respectively, two sampling ends of current divider respectively with current sample
Circuit connection.
When the normal wiring of electric energy meter, refering to fig. 1, the first sample circuit I is connected by third connecting terminal 3 and high direct voltage end
It connects, the 4th connecting terminal 4 is connect with DC low-voltage end, and it is all signal that the second connecting terminal 2 and the 4th connecting terminal 4, which are shorted,
Low side, i.e. signal are with reference to ground；Referring to Fig.2, the 4th connecting terminal 4 is grounded, the end of resistance R4 is also grounded, and second is adopted at this time
Sample circuit I I is shorted, and is not involved in sampling metering, and metering chip passes through the first sample circuit I sampling metering.And when electric energy meter is incited somebody to action
When third connecting terminal 3 and reversed the 4th connecting terminal 4, third connecting terminal 3 is grounded at this time, and the 4th connecting terminal 4 is high pressure
End, the second sample circuit II are connect with high direct voltage end, and the first sample circuit I is connect with DC low-voltage end, the end of resistance R4
Also it is grounded, the first sample circuit I is shorted, and metering chip will not influence point by the second sample circuit II sampling metering
Therefore stream device and current sampling circuit when the extra- portion's pressure-wire of the electric energy of the utility model is reversed, can not only avoid voltage
The low side short circuit of network, plays the role of protection, but also will not influence the voltage sample and current sample of electric energy meter.
It is specific as shown in Fig. 2, voltage sampling circuit include the first sample circuit I being connected in series by multiple resistance Ri and
The second sample circuit II being connected in series by multiple resistance Rii.Preferably, the first sample circuit I and the second sample circuit II
All-in resistance is equal, and the resistance Ri is identical with the resistance value of resistance Rii, and the quantity of resistance Ri is equal to second in the first sample circuit I
The quantity of resistance Rii in sample circuit II.Certain resistance value or resistance quantity can also be different.First sample circuit I and second is adopted
One end of sample circuit I I is connected by varistor RV, and respectively with the third connecting terminal 3 for connecting high direct voltage end
With the 4th connecting terminal 4 connection for connecting DC low-voltage end, the other end of the first sample circuit I and the second sample circuit II
Passing through V3P ' terminal after being connected and connect with metering chip and pass through resistance R4 and is grounded, varistor RV can absorb lightning surge,
Protect the first sample circuit I and the second sample circuit II of rear end.
Further, the resistance Ri is identical with resistance Rii, and the quantity of resistance Ri is equal to second in the first sample circuit I
The quantity of resistance Rii in sample circuit II, preferably 10, and resistance Ri and resistance Rii are preferably precision resister, resistance
For Ri as resistance Rii resistance value, partial pressure is impartial, single ohmically maximum voltage can be reduced, in this way can be maximum
The error of total resistance value between the first sample circuit I and the second sample circuit II is reduced in degree, reduction connects in external pressure-wire
The error of inverse time metering, and prevent a resistance both end voltage big, another smaller situation.Resistance R4 is adopted for determination
Sample input signal, the resistance of preferably small resistance value.
A kind of embodiment of current sampling circuit as shown in Figure 2, current sampling circuit pass through the first connecting terminal 1 and the
Two connecting terminals 2 are connect with two sampling ends of current divider, two terminals of current divider respectively with third connecting terminal 3 and
The connection of four connecting terminals 4.Current sampling circuit includes resistance R1 and resistance R2, and one end of resistance R1 and resistance R2 pass through respectively
One connecting terminal 1 and the second connecting terminal 2 are connect with two sampling ends of current divider.It is of special importance that in resistance R1 and electricity
One end that resistance R2 is connect with current divider is connected by resistance R3, and the tie point ground connection of resistance R2 and R3, by the way that resistance R3 is arranged
Can prevent current sample line from surprisingly disconnecting, one end floating and cause electricity to fly away, the other end of resistance R1 and resistance R2 difference
It is connect, and is connected between resistance R1 and the other end of resistance R2 concatenated with metering chip by VIP terminal and VIN terminal
Capacitor C1 and capacitor C2, the tie point ground connection between capacitor C1 and capacitor C2, resistance R1 and capacitor C1 and resistance R2 and capacitor
C2 separately constitutes filter network, for filtering out the high frequency spurious signal on route.
It, cannot the above content is specific preferred embodiment further detailed description of the utility model is combined
Assert that the specific implementation of the utility model is only limited to these instructions.For example, third connecting terminal 3 and the 4th connecting terminal 4
It is the title for representing connecting terminal, not indicates third and the 4th connecting terminal.Voltage sampling circuit can also use it
Its physical circuit.For the utility model person of an ordinary skill in the technical field, the utility model is not being departed from
Under the premise of design, a number of simple deductions or replacements can also be made, all shall be regarded as belonging to the protection scope of the utility model.
Claims (8)
1. a kind of electric energy meter, including current divider and metering chip, it is characterised in that: including metering chip, current divider, and connection
Current sampling circuit between current divider and metering chip and the voltage sampling circuit being connected between power supply and metering chip；
Voltage sampling circuit includes the first sample circuit and the second sample circuit, one end point of the first sample circuit and the second sample circuit
Not with for connecting to power supply third connecting terminal and the 4th connecting terminal connect, the first sample circuit and the second sample circuit
The other end be connected after connect with metering chip and pass through resistance R4 and be grounded, two terminals of current divider respectively with third wiring
Terminal and the connection of the 4th connecting terminal.
2. electric energy meter according to claim 1, it is characterised in that: two samplings of the current sampling circuit and current divider
End connects, and is connected between two sampling ends of current divider by resistance R3, and a sampling end of current divider is with resistance R3's
Tie point ground connection.
3. electric energy meter according to claim 1, it is characterised in that: first sample circuit includes multiple series connections
Resistance Ri, second sample circuit include the resistance Rii of multiple series connections, and the all-in resistance of the first sample circuit and second is adopted
The all-in resistance of sample circuit is equal.
4. electric energy meter according to claim 3, it is characterised in that: each resistance Ri is identical with the resistance value of each resistance Rii,
The quantity of resistance Ri is equal to the quantity of resistance Rii in the second sample circuit in first sample circuit.
5. electric energy meter according to claim 3, it is characterised in that: the quantity of the resistance Ri and resistance Rii is 10.
6. electric energy meter according to claim 1, it is characterised in that: the one of first sample circuit and the second sample circuit
End is connected by varistor RV.
7. electric energy meter according to claim 1, it is characterised in that: the current sampling circuit includes resistance R1 and resistance
One end of R2, resistance R1 and resistance R2 are connect with current divider respectively, the other end of resistance R1 and resistance R2 respectively with metering chip
Connection, one end that resistance R1 and resistance R2 are connect with current divider are connected by resistance R3, and the tie point ground connection of resistance R2 and R3,
And capacitor C1 and capacitor C2 are connected between resistance R1 and the resistance R2 other end, the tie point between capacitor C1 and capacitor C2 connects
Ground.
8. electric energy meter according to claim 1, it is characterised in that: the current sampling circuit includes resistance R1 and resistance
One end of R2, resistance R1 and resistance R2 pass through the first connecting terminal respectively and the second connecting terminal is connect with current divider, resistance R1
It is connect respectively with metering chip with the other end of resistance R2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820575561.8U CN208283460U (en) | 2018-04-20 | 2018-04-20 | Electric energy meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820575561.8U CN208283460U (en) | 2018-04-20 | 2018-04-20 | Electric energy meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208283460U true CN208283460U (en) | 2018-12-25 |
Family
ID=64751865
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820575561.8U Active CN208283460U (en) | 2018-04-20 | 2018-04-20 | Electric energy meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208283460U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
-
2018
- 2018-04-20 CN CN201820575561.8U patent/CN208283460U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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Legal Events
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP02 | Change in the address of a patent holder | ||
| CP02 | Change in the address of a patent holder |
Address after: Zhengtai Instrument Measurement Industrial Park, No.1 Liangce Road, Beibaixiang Town, Leqing City, Wenzhou City, Zhejiang Province, 325603 Patentee after: ZHEJIANG CHINT INSTRUMENT & METER Co.,Ltd. Address before: 325603 Wenzhou Bridge Industrial Zone, Zhejiang, Yueqing Patentee before: ZHEJIANG CHINT INSTRUMENT & METER Co.,Ltd. |