CN208833815U - Electric energy meter - Google Patents
Electric energy meter Download PDFInfo
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- CN208833815U CN208833815U CN201820871393.7U CN201820871393U CN208833815U CN 208833815 U CN208833815 U CN 208833815U CN 201820871393 U CN201820871393 U CN 201820871393U CN 208833815 U CN208833815 U CN 208833815U
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- 239000003990 capacitor Substances 0.000 claims abstract description 33
- 238000005070 sampling Methods 0.000 claims abstract description 29
- 238000012545 processing Methods 0.000 claims abstract description 17
- 230000001052 transient effect Effects 0.000 claims abstract description 14
- 230000001629 suppression Effects 0.000 claims abstract description 12
- 238000005259 measurement Methods 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 2
- 230000001681 protective effect Effects 0.000 abstract description 3
- 230000005611 electricity Effects 0.000 description 15
- 238000010586 diagram Methods 0.000 description 3
- 230000006837 decompression Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 206010037660 Pyrexia Diseases 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002085 persistent effect Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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Abstract
A kind of electric energy meter, including current sampling module, voltage sample module, electric energy metering module and power supply processing module for electric energy metering module and voltage sample module for power supply, power supply processing module includes capacitance-resistance voltage reduction circuit, capacitance-resistance potential circuit includes resistance R10, the front end of resistance R10 is connect by step-down capacitor C10 with zero curve, the front end of step-down capacitor C10 is equipped with the varistor RV1 being connected between zero curve and firewire, the Transient Suppression Diode D4 being connected between zero curve and firewire is equipped between step-down capacitor C10 and resistance R10, the other end of resistance R10 passes through diode D2 and firewire connect and ground, protection device is placed on the low-pressure end of power circuit, Transient Suppression Diode D4 is set in the front end resistance R1 of capacitance-resistance voltage reduction circuit simultaneously, it will by Transient Suppression Diode D4 In a section, protective resistance R1 is burnt the voltage clamping of the front end resistance R1 from overheat.
Description
Technical field
The utility model relates to fields of measurement, more particularly to a kind of electric energy meter.
Background technique
Resistance-capacitance depressurization has many advantages and disadvantage as very widely used power source design, and electric energy meter is transported at the scene
During row, some special electrical equipments have been accessed in rear end, and it is humorous that these equipment bring high order to power grid in use
Wave pollution, as powered inside electric energy meter using resistance-capacitance depressurization mode, most of supply voltage under which concentrates on capacitor two
End, according to the calculation formula Xc=1/ (2 π fC) of capacitive reactance, wherein capacitance C is usually fixed, humorous when being mixed into high order in power grid
The frequency values f that will lead in formula when wave and higher content becomes larger, and so as to cause capacitor capacitive reactance reduction, voltage is got at capacitor both ends
It can reduce, the current-limiting resistance both end voltage of rear end will increase, and after being more than its rated power, resistance can be burnt because of persistent fever
It ruins, to the phenomenon that electric energy meter is burnt occur, traditional resistance-capacitance depressurization scheme is caused to can no longer meet requirement at this time, so
Many electronic products all use transformer or Switching Power Supply instead as power source design.
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 sampling module, voltage sample module, electric energy metering module and be electrical energy measurement mould
The power supply processing module of block and voltage sample module for power supply, power supply processing module include capacitance-resistance voltage reduction circuit, capacitance-resistance potential circuit
Including resistance R10, the front end of resistance R10 is connect by step-down capacitor C10 with zero curve, and the front end of step-down capacitor C10 is equipped with connection
Varistor RV1 between zero curve and firewire, be equipped between step-down capacitor C10 and resistance R10 be connected to zero curve and firewire it
Between Transient Suppression Diode D4, the other end of resistance R10 passes through diode D2 and firewire connect and ground.
Optionally, the power supply processing module further includes rectification circuit, filter circuit and voltage regulator circuit, resistance-capacitance depressurization electricity
The output end and rectification circuit on road, rectification circuit are connect with filter circuit, and filter circuit is connect with voltage regulator circuit, voltage regulator circuit
Output end is connect with electric energy metering module.
It optionally, further include pulse output module and register display module, pulse output module and register show mould
Block is connect with electric energy metering module respectively.
Optionally, two sampling ends of the current sampling module and current divider connect, two sampling ends of current divider it
Between connected by resistance R3, and the tie point of a sampling end of current divider and resistance R3 are grounded.
Optionally, the voltage sample module include the first sample circuit and the second sample circuit, the first sample circuit and
One end of second sample circuit is connect with power supply processing module respectively, the other end phase of the first sample circuit and the second sample circuit
The metering chip of Lian Houyu electric energy metering module connects and passes through resistance R4 and is grounded.
Optionally, first sample circuit includes the resistance Ri of multiple series connections, and second sample circuit includes
The all-in resistance of the resistance Rii of multiple series connections, the all-in resistance of the first sample circuit and the second sample circuit is equal.
Optionally, each resistance Ri is identical with the resistance value of each resistance Rii, the quantity of resistance Ri in the first sample circuit
Equal to the quantity of resistance Rii in the second sample circuit.
Optionally, the quantity of the resistance Ri and resistance Rii is 10.
Optionally, one end of first sample circuit and the second sample circuit is connected by varistor RV.
Optionally, the current sampling module 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 the metering chip of electric energy metering module respectively, 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, and resistance R1 and electricity
It is connected with capacitor C1 and capacitor C2 between the resistance R2 other end, the tie point ground connection between capacitor C1 and capacitor C2.
The electric energy meter of the utility model is placed on protection device the low-pressure end of power circuit, while in capacitance-resistance voltage reduction circuit
The front end resistance R1 Transient Suppression Diode D4 is set, by Transient Suppression Diode D4 by the voltage clamping of the front end resistance R1
In a section, so that protective resistance R1 is burnt from overheat, when higher hamonic wave pollution is eliminated, get electricity on capacitor C1
Buckling is more, and resistance R1 both end voltage drops to the reversed blanking voltage of Transient Suppression Diode D4, and circuit restores to operate normally.This
Outside, if conducting wire is reversed in actual use, the high-voltage end of current divider is connect with the 4th connecting terminal 4, low-pressure end with connect
Line terminals 3 connect, then the first sample circuit I is shorted, the second sample circuit II is taken as sampling access access, due to second
Sample circuit II's not only has certain resistance value, and electric energy meter will not be burnt out when being shorted ensure that use is safe, even if in electricity
Can make electric energy meter that can still be measured in the case where table reversal connection, have the characteristics that structure simply, it is high reliablity, at low cost.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model electric energy meter
Fig. 2 is the circuit diagram of the utility model capacitance-resistance voltage reduction circuit；
Fig. 3 is the circuit diagram of the utility model voltage sample module and current sampling module.
Specific embodiment
Below in conjunction with the embodiment that attached drawing 1-3 is provided, 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 Figure 1, a kind of electric energy meter, including current divider, power supply processing module, current sampling module, voltage sample mould
Block, electric energy metering module, pulse output module and register display module, power supply processing module and voltage sample module and electric energy
Metering module connection, and be each section module for power supply in electric energy meter, electric energy metering module is for current signal and voltage signal
Processing, register display module be used for show consumption energy value, pulse output module be used to indicate currently whether electricity consumption and reality
Existing electric energy verification.
A kind of embodiment of power supply processing module as shown in Figure 2, power supply processing module are used for power frequency comprising capacitance-resistance drop
Volt circuit, capacitance-resistance voltage reduction circuit include resistance R10, and the front end of resistance R10 is connect by step-down capacitor C10 with zero curve, decompression electricity
The front end for holding C10 is equipped with the varistor RV1 being connected between zero curve and firewire, sets between step-down capacitor C10 and resistance R10
There is the Transient Suppression Diode D4 being connected between zero curve and firewire, the other end of resistance R10 is connected by diode D2 and firewire
It connects and is grounded.
The varistor RV1 can play the role of Anti-surging, and resistance R10 is used to absorb the peak value electricity of powered on moment
Stream is equipped with the step-down capacitor C10 of decompression in the front end of resistance R10, presses down if also not needing setting transient state without step-down capacitor
Diode D4 processed.
The electric energy meter of the utility model is by being placed on protection device the low-pressure end of power circuit, while in resistance-capacitance depressurization electricity
Transient Suppression Diode D4 is arranged in the front end resistance R10 on road, when higher hamonic wave pollution is more in power grid, on capacitor C10 partial pressure compared with
It is few, when power resistor R10 both end voltage increases to certain value, acted by Transient Suppression Diode D4 by the front end resistance R10
Voltage clamping in a section, thus protective resistance R10 from overheat burn, when higher hamonic wave pollution be eliminated when (such as certain
A little electrical equipments are out of service), get voltage on capacitor C10 and become more, resistance R10 both end voltage drops to two poles of transient state inhibition
When the reversed blanking voltage of pipe D4, Transient Suppression Diode D4 is failure to actuate at this time, and circuit restores to operate normally.
Further, the power supply processing module further includes rectification circuit, filter circuit and voltage regulator circuit, resistance-capacitance depressurization electricity
The output end and rectification circuit on road, rectification circuit are connect with filter circuit, and filter circuit is connect with voltage regulator circuit, voltage regulator circuit
Output end is connect with electric energy metering module.
If Fig. 3 shows a kind of embodiment of voltage sample module, voltage sample module includes the first sample circuit I and the
One end of two sample circuit II, the first sample circuit and the second sample circuit is connect with power supply processing module respectively, the first sampling
The other end of circuit and the second sample circuit connect with the metering chip of electric energy metering module after being connected and passes through resistance R4 and is grounded.
Specifically, one end of the first sample circuit I and the second sample circuit II respectively with the third connecting terminal for connecting to power supply
3 and the 4th connecting terminal 4 connect, the other end of the first sample circuit I and the second sample circuit II be connected after with metering chip company
It connecing and passes through resistance R4 and be grounded, two terminals of current divider are connect with third connecting terminal 3 and the 4th connecting terminal 4 respectively,
Two sampling ends of current divider are connect with current sampling module respectively.
When the normal wiring of electric energy meter, the first sample circuit I is connect by third connecting terminal 3 with high direct voltage end, and the 4th
Connecting terminal 4 is connect with DC low-voltage end, and it is all the low side of signal, i.e., that the second connecting terminal 2 and the 4th connecting terminal 4, which are shorted,
Signal is with reference to ground；4th connecting terminal 4 is grounded, and the end of resistance R4 is also grounded, and the second sample circuit II is shorted at this time,
It is not involved in sampling metering, metering chip passes through the first sample circuit I sampling metering.And when electric energy meter by third connecting terminal 3 with
When 4th connecting terminal 4 is reversed, third connecting terminal 3 is grounded at this time, and the 4th connecting terminal 4 is high-voltage end, the second sample circuit
II is connect with high direct voltage end, and the first sample circuit I is connect with DC low-voltage end, and the end of resistance R4 is also grounded, the first sampling
Circuit I is shorted, and metering chip will not influence current divider and current sample mould by the second sample circuit II sampling metering
Therefore block when the extra- portion's pressure-wire of the electric energy of the utility model is reversed, can not only avoid the low side short circuit of voltage network,
Play the role of protection, but also will not influence the voltage sample and current sample of electric energy meter.
Specifically, voltage sample module includes the first sample circuit I being connected in series by multiple resistance Ri and by multiple electricity
The second sample circuit II that resistance Rii is connected in series.Preferably, the all-in resistance phase of the first sample circuit I and the second sample circuit II
Deng, the resistance Ri is identical with the resistance value of resistance Rii, in the first sample circuit I the quantity of resistance Ri be equal to the second sample circuit
The quantity of resistance Rii in II.Certain resistance value or resistance quantity can also be different.First sample circuit I and the second sample circuit II
One end connected by varistor RV, and respectively with the third connecting terminal 3 for connecting high direct voltage end and for connecting
The 4th connecting terminal 4 for connecing DC low-voltage end connects, and the other end of the first sample circuit I and the second sample circuit II lead to after being connected
It crosses V3P ' terminal and is connect with metering chip and pass through resistance R4 and be grounded, varistor RV can absorb lightning surge, protect rear end
The first sample circuit I and the second sample circuit II.
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, electricity
Ri is hindered as resistance Rii resistance value, and partial pressure is impartial, single ohmically maximum voltage can be reduced, in this way can be most
The error that total resistance value between the first sample circuit I and the second sample circuit II is reduced in big degree, reduces in external pressure-wire
The error measured when reversed, and prevent a resistance both end voltage big, another smaller situation.Resistance R4 is for determining
Sampled input signal, the resistance of preferably small resistance value.
If Fig. 3 shows a kind of embodiment of current sampling module, current sampling module passes 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 module 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 the ordinary skill of the utility model technical field
For personnel, without departing from the concept of the premise utility, a number of simple deductions or replacements can also be made, should all regard
To belong to the protection scope of the utility model.
Claims (10)
1. a kind of electric energy meter, including current sampling module, voltage sample module, electric energy metering module and be electric energy metering module
With the power supply processing module of voltage sample module for power supply, it is characterised in that: power supply processing module includes capacitance-resistance voltage reduction circuit, capacitance-resistance
Potential circuit includes resistance R10, and the front end of resistance R10 is connect by step-down capacitor C10 with zero curve, the front end of step-down capacitor C10
Equipped with the varistor RV1 being connected between zero curve and firewire, it is equipped between step-down capacitor C10 and resistance R10 and is connected to zero curve
The other end of Transient Suppression Diode D4 between firewire, resistance R10 pass through diode D2 and firewire connect and ground.
2. electric energy meter according to claim 1, it is characterised in that: the power supply processing module further include rectification circuit,
Filter circuit and voltage regulator circuit, the output end and rectification circuit of capacitance-resistance voltage reduction circuit, rectification circuit are connect with filter circuit, filtering
Circuit is connect with voltage regulator circuit, and the output end of voltage regulator circuit is connect with electric energy metering module.
3. electric energy meter according to claim 1, it is characterised in that: further include that pulse output module and register show mould
Block, pulse output module and register display module are connect with electric energy metering module respectively.
4. electric energy meter according to claim 1, it is characterised in that: two samplings of the current sampling module 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.
5. electric energy meter according to claim 1, it is characterised in that: the voltage sample module include the first sample circuit and
One end of second sample circuit, the first sample circuit and the second sample circuit is connect with power supply processing module respectively, the first sampling
The other end of circuit and the second sample circuit connect with the metering chip of electric energy metering module after being connected and passes through resistance R4 and is grounded.
6. electric energy meter according to claim 5, 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.
7. electric energy meter according to claim 6, 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.
8. electric energy meter according to claim 6, it is characterised in that: the quantity of the resistance Ri and resistance Rii is 10.
9. electric energy meter according to claim 5, it is characterised in that: the one of first sample circuit and the second sample circuit
End is connected by varistor RV.
10. electric energy meter according to claim 1, it is characterised in that: the current sampling module 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 electrical energy measurement
The metering chip of module connects, and one end that resistance R1 and resistance R2 are connect with current divider is connected by resistance R3, and resistance R2 and
The tie point of R3 is grounded, and capacitor C1 and capacitor C2, capacitor C1 and capacitor are connected between resistance R1 and the resistance R2 other end
Tie point ground connection between C2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820871393.7U CN208833815U (en) | 2018-06-06 | 2018-06-06 | Electric energy meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820871393.7U CN208833815U (en) | 2018-06-06 | 2018-06-06 | Electric energy meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208833815U true CN208833815U (en) | 2019-05-07 |
Family
ID=66305267
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820871393.7U Active CN208833815U (en) | 2018-06-06 | 2018-06-06 | Electric energy meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208833815U (en) |
-
2018
- 2018-06-06 CN CN201820871393.7U patent/CN208833815U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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. |