CN206300999U - A kind of metering circuit for being applied to multichannel ac digital electric energy meter - Google Patents
A kind of metering circuit for being applied to multichannel ac digital electric energy meter Download PDFInfo
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- CN206300999U CN206300999U CN201621380965.9U CN201621380965U CN206300999U CN 206300999 U CN206300999 U CN 206300999U CN 201621380965 U CN201621380965 U CN 201621380965U CN 206300999 U CN206300999 U CN 206300999U
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Abstract
The utility model discloses a kind of metering circuit for being applied to multichannel ac digital electric energy meter, input is connected with loop to be measured, output end is connected with the data input pin of main control chip, control end selects terminal to be connected with the piece of main control chip, it is connected with power module, including 12 road voltage acquisition units, 12 road current acquisition units and four computation chips, 12 road voltage acquisition units gather the voltage signal in 12 tunnels loop to be measured, 12 road current acquisition units gather the current signal in 12 tunnels loop to be measured, input per a piece of computation chip is connected with the output end of three road voltage acquisition units and the output end of three road current acquisition units respectively；The drawbacks of overcoming existing multiloop electric energy meter time-sharing measurement, substantially increases certainty of measurement, active to reach 0.1S, idle 0.2S.
Description
Technical field
The utility model is related to a kind of digital electric meter, especially a kind of metering for being applied to multichannel ac digital electric energy meter
Circuit.
Background technology
In the prior art, intelligent electric meter includes multiple electric energy metering modules, and existing multiloop electric energy meter is multiple using timesharing
With technology, certainty of measurement is not high, additionally, multichannel is powered for same power supply, is broken down in power circuit, can cause intelligence
Energy ammeter cannot carry out normal voltage x current data acquisition.
Utility model content
The purpose of this utility model is to provide a kind of metering circuit for being applied to multichannel ac digital electric energy meter, input
It is connected with loop to be measured, output end is connected with the data input pin of main control chip, control end selects terminal to connect with the piece of main control chip
Connect, be connected with power module, including 12 road voltage acquisition units, 12 road current acquisition units and four computation chips, ten
Two road voltage acquisition units gather the voltage signal in 12 tunnels loop to be measured, and it is to be measured that 12 road current acquisition units gather 12 tunnels
The current signal in loop, per a piece of computation chip input respectively with the output end and three road electric currents of three road voltage acquisition units
The output end connection of collecting unit；
Voltage acquisition unit includes voltage transformer, and the input of voltage transformer is connected with loop to be measured all the way, voltage
One lead-out terminal of transformer is grounded after being connected with first voltage resistance, and the lead-out terminal is defeated after being connected with second voltage resistance
Go out voltage signal, be grounded after second voltage resistance and the first capacitance connection；Another output end of voltage transformer and the 3rd electricity
Be grounded after piezoresistance connection, the lead-out terminal be connected with the 4th voltage resistance after output voltage signal, the 4th voltage resistance and the
It is grounded after two capacitance connections；
Current acquisition unit includes current transformer, the input terminal 1 of current transformer, input terminal 2 with it is to be measured all the way
Loop connects, and the lead-out terminal 3 of current transformer is grounded after being connected with the first current resistor, the electric current of lead-out terminal 3 and second electricity
Output voltage signal after resistance connection, is grounded after the second current resistor and the 3rd capacitance connection；The lead-out terminal 4 of voltage transformer with
3rd current resistor connection after be grounded, lead-out terminal 4 be connected with the 4th current resistor after output voltage signal, the 4th current resistor
It is grounded with after the 4th capacitance connection；
Computation chip uses high-precision measuring chip ATT7022EU, 6 tunnels that high-precision measuring chip ATT7022EU is included
Acquisition channel is connected with the output end of three road voltage acquisition units and the output end of three road current acquisition units successively, and high accuracy is counted
The chip selection signal of amount chip ATT7022EU selects end to be connected with the computation chip piece of main control chip, high-precision measuring chip
The output end of ATT7022EU is connected with the continuous data input of main control chip.
Further, power module includes ten two-way power supply power subsystems, ten two-way power supply power supplys and 12 road voltage electricity
Stream collecting unit is connected one to one, and rectification circuit, lightning protection circuit, overvoltage circuit, excessively stream are included per power supply unit all the way
Circuit, transforming circuit, switch power integrated circuit and photoelectric coupled circuit, with switch after the rectified circuit in loop to be measured, transforming circuit
One input connection of power IC, with switch power integrated circuit after the rectified circuit in loop to be measured, lightning protection circuit
The connection of an input, an output end of transforming circuit is connected with the input for crossing current circuit, output supply voltage, excessively stream
The output end of circuit is connected with photoelectric coupled circuit, another output end of transforming circuit be connected with photoelectric coupled circuit after with Switching Power Supply collection
An input into circuit is connected.
Further, the pin RA4 of main control chip U2, pin RA5, pin RE0, pin RE1 successively with four metering cores
The chip select pin connection of piece, pin RA2, pin RA3, pin RC1, the pin RC0 of main control chip U2 successively with four metering cores
The output end connection of piece；
The pin 2 of clock chip U4 one end respectively with crystal oscillator chip Y2, one end of electric capacity C31 are connected, pin 3 and crystal oscillator
One end connection of the other end, electric capacity C32 of chip Y2, the pin 5 of clock chip U4 is connected with the pin NC of main control chip U2, when
The pin 6 of clock chip U4 is connected with the pin RB7 of main control chip U2, the pin 7 of clock chip U4 and the pin of main control chip U2
RB6 is connected；
The pin 1 of storage chip U7 is connected with the pin RD4 of main control chip U2, pin 2 and the master control core of storage chip U7
The pin RD5 connections of piece U2, the pin 5 of storage chip U7 is connected with the pin RB0 of main control chip U2, the pin of storage chip U7
6 are connected with the pin RD7 of main control chip U2, and the pin 3 of storage chip U7 is connected with the pin RD6 of main control chip U2；
The pin RB2 of main control chip U2 is connected after being connected with resistance R12 with the base stage of triode Q1, the current collection of triode Q1
Extremely external power supply module output voltage, the emitter stage of triode Q1 is connected after being connected with resistance Rb1 with the pin 1 of backlight B1,
The pin 2 of backlight B1 is grounded.
The beneficial effects of the utility model are,
1st, the utility model electric energy metering module includes four separate AC ammeter computation chips, respectively with multichannel
Current sampling circuit and voltage sample loop connect, and each loop is detected and measured simultaneously simultaneously, each chip power independence, measurement essence
Degree reaches 0.1 grade.The drawbacks of overcoming existing multiloop electric energy meter time-sharing measurement, substantially increases certainty of measurement, active to reach
0.1S, idle 0.2S.
2nd, the design of power source special, when load become weight or loop voltage to be measured it is too low and when causing 5V voltages to decline, flow through
Optical coupler electric current reduces, and photosensitive tube internal resistance increase, the G electrode potentials of WS175 decline, through WS175 internal circuits relatively after make switch
Pipe frequency is raised, and output voltage rises；Vice versa.If load short circuits cause switching tube serious excessively stream, internal excessively stream
Protection circuit will be acted, and Switching Power Supply failure of oscillation, whole machine are protected by controlling circuit.Electrical stability is improved, work(is improved
Rate conversion ratio, it is low in energy consumption.
Brief description of the drawings
Fig. 1 is the metering circuit figure for being applied to multichannel ac digital electric energy meter；
Fig. 2 is first via voltage acquisition unit circuit diagram；
Fig. 3 is first via current acquisition element circuit figure；
Fig. 4 is the second road voltage acquisition unit circuit diagram；
Fig. 5 is the second road current acquisition element circuit figure；
Fig. 6 is the 3rd road voltage acquisition unit circuit diagram；
Fig. 7 is the 3rd road current acquisition element circuit figure；
Fig. 8 is the 4th road voltage acquisition unit circuit diagram；
Fig. 9 is the 4th road current acquisition element circuit figure；
Figure 10 is the 5th road voltage acquisition unit circuit diagram；
Figure 11 is the 5th road current acquisition element circuit figure；
Figure 12 is the 6th road voltage acquisition unit circuit diagram；
Figure 13 is the 6th road current acquisition element circuit figure；
Figure 14 is the 7th road voltage acquisition unit circuit diagram；
Figure 15 is the 7th road current acquisition element circuit figure；
Figure 16 is the 8th road voltage acquisition unit circuit diagram；
Figure 17 is the 8th road current acquisition element circuit figure；
Figure 18 is the 9th road voltage acquisition unit circuit diagram；
Figure 19 is the 9th road current acquisition element circuit figure；
Figure 20 is the tenth road voltage acquisition unit circuit diagram；
Figure 21 is the tenth road current acquisition element circuit figure；
Figure 22 is the 11st road voltage acquisition unit circuit diagram；
Figure 23 is the 11st road current acquisition element circuit figure；
Figure 24 is the 12nd road voltage acquisition unit circuit diagram；
Figure 25 is the 12nd road current acquisition element circuit figure；
Figure 26 is first piece computation chip circuit diagram；
Figure 27 is second computation chip circuit diagram；
Figure 28 is the 3rd computation chip circuit diagram；
Figure 29 is the 4th computation chip circuit diagram；
Figure 30 is power circuit diagram；
Figure 31 is main control chip circuit diagram.
Specific embodiment
As shown in figure 1, a kind of metering circuit for being applied to multichannel ac digital electric energy meter, input connects with loop to be measured
Connect, output end is connected with the data input pin of main control chip, control end selects terminal to be connected with the piece of main control chip, with power module
Connection, including 12 road voltage acquisition units, 12 road current acquisition units and four computation chips, 12 road voltage acquisition lists
The voltage signal in unit's collection 12 tunnels loop to be measured, the electric current letter in 12 road current acquisition unit collection 12 tunnels loops to be measured
Number, input per a piece of computation chip is defeated with the output end of three road voltage acquisition units and three road current acquisition units respectively
Go out end connection.
As shown in Fig. 2 voltage acquisition unit includes voltage transformer, the input of voltage transformer and loop to be measured all the way
Connection a, lead-out terminal of voltage transformer is grounded after being connected with resistance R127, and the lead-out terminal is defeated after being connected with resistance R17
Go out voltage signal V2P, resistance R17 is grounded after being connected with electric capacity C18；Another output end of voltage transformer connects with resistance R128
After connecing be grounded, the lead-out terminal be connected with resistance R18 after output voltage signal V2N, resistance R18 be connected with electric capacity C22 after ground connection.
As shown in figure 3, current acquisition unit include current transformer, the input terminal of current transformer with treat the survey time all the way
Road connects, the lead-out terminal 3 of current transformer be connected with resistance R23 after ground connection, lead-out terminal 3 is defeated after being connected with resistance R29
Go out voltage signal V1N, resistance R29 is grounded after being connected with electric capacity C30；After the lead-out terminal 4 of voltage transformer is connected with resistance R24
Ground connection, lead-out terminal 4 be connected with resistance R30 after output voltage signal V1P, resistance R30 be connected with electric capacity C31 after ground connection.
As shown in Fig. 4 to Figure 25,11 road voltage acquisition units and 11 road current acquisition units are completed to other 11
The voltage signal and current signal in road loop to be measured are gathered, and described in circuit diagram principle same Fig. 2, Fig. 3, be will not be repeated here.
As shown in figure 26, computation chip uses high-precision measuring chip ATT7022EU, high-precision measuring chip
The 6 road acquisition channels that ATT7022EU is included successively with the output end of three road voltage acquisition units and three road current acquisition units
Output end is connected, and the chip selection signal of high-precision measuring chip ATT7022EU selects end to be connected with the computation chip piece of main control chip, high
The output end of precision computation chip ATT7022EU is connected with the continuous data input of main control chip.
As shown in Figure 27 to Figure 29, three computation chips and nine road voltage acquisition units and nine road current acquisition units it is defeated
Go out end connection, the same Figure 26 of principle will not be repeated here.
As shown in figure 30, power module includes ten two-way power supply power subsystems, ten two-way power supply power supplys and 12 road voltages
Current acquisition unit is connected one to one, and rectification circuit, lightning protection circuit, overvoltage circuit, mistake are included per power supply unit all the way
Current circuit, transforming circuit, switch power integrated circuit and photoelectric coupled circuit, after the rectified circuit in loop to be measured, transforming circuit with open
The input connection of power IC is closed, with the integrated electricity of Switching Power Supply after the rectified circuit in loop to be measured, lightning protection circuit
One input connection on road a, output end of transforming circuit is connected with the input for crossing current circuit, exports supply voltage, mistake
The output end of current circuit is connected with photoelectric coupled circuit, another output end of transforming circuit be connected with photoelectric coupled circuit after with Switching Power Supply
One input connection of integrated circuit.
As shown in figure 31, the pin RA4 of main control chip U2, pin RA5, pin RE0, pin RE1 are measured with four successively
The chip select pin connection of chip, pin RA2, pin RA3, pin RC1, the pin RC0 of main control chip U2 are measured with four successively
The output end connection of chip；
The pin 2 of clock chip U4 one end respectively with crystal oscillator chip Y2, one end of electric capacity C31 are connected, pin 3 and crystal oscillator
One end connection of the other end, electric capacity C32 of chip Y2, the pin 5 of clock chip U4 is connected with the pin NC of main control chip U2, when
The pin 6 of clock chip U4 is connected with the pin RB7 of main control chip U2, the pin 7 of clock chip U4 and the pin of main control chip U2
RB6 is connected；
The pin 1 of storage chip U7 is connected with the pin RD4 of main control chip U2, pin 2 and the master control core of storage chip U7
The pin RD5 connections of piece U2, the pin 5 of storage chip U7 is connected with the pin RB0 of main control chip U2, the pin of storage chip U7
6 are connected with the pin RD7 of main control chip U2, and the pin 3 of storage chip U7 is connected with the pin RD6 of main control chip U2；
The pin RB2 of main control chip U2 is connected after being connected with resistance R12 with the base stage of triode Q1, the current collection of triode Q1
Extremely external power supply module output voltage, the emitter stage of triode Q1 is connected after being connected with resistance Rb1 with the pin 1 of backlight B1,
The pin 2 of backlight B1 is grounded.
It is not new to this practicality although above-mentioned be described with reference to accompanying drawing to specific embodiment of the present utility model
The limitation of type protection domain, one of ordinary skill in the art should be understood that on the basis of the technical solution of the utility model, ability
Various modifications or deform still in protection model of the present utility model that field technique personnel make by need not paying creative work
Within enclosing.
Claims (3)
1. a kind of metering circuit for being applied to multichannel ac digital electric energy meter, it is characterised in that input connects with loop to be measured
Connect, output end is connected with the data input pin of main control chip, control end selects terminal to be connected with the piece of main control chip, with power module
Connection, including 12 road voltage acquisition units, 12 road current acquisition units and four computation chips, 12 road voltage acquisition lists
The voltage signal in unit's collection 12 tunnels loop to be measured, the electric current letter in 12 road current acquisition unit collection 12 tunnels loops to be measured
Number, input per a piece of computation chip is defeated with the output end of three road voltage acquisition units and three road current acquisition units respectively
Go out end connection；
Voltage acquisition unit includes voltage transformer, and the input of voltage transformer is connected with loop to be measured all the way, mutual induction of voltage
One lead-out terminal of device is grounded after being connected with first voltage resistance, and the lead-out terminal exports electricity after being connected with second voltage resistance
Pressure signal, is grounded after second voltage resistance and the first capacitance connection；Another output end of voltage transformer and tertiary voltage electricity
Be grounded after resistance connection, the lead-out terminal be connected with the 4th voltage resistance after output voltage signal, the 4th voltage resistance and second electric
It is grounded after holding connection；
Current acquisition unit includes current transformer, the input terminal 1 of current transformer, input terminal 2 and loop to be measured all the way
Connection, the lead-out terminal 3 of current transformer is grounded after being connected with the first current resistor, and the current resistor of lead-out terminal 3 and second connects
Rear output voltage signal is connect, is grounded after the second current resistor and the 3rd capacitance connection；The lead-out terminal 4 and the 3rd of voltage transformer
Be grounded after current resistor connection, lead-out terminal 4 be connected with the 4th current resistor after output voltage signal, the 4th current resistor and the
It is grounded after four capacitance connections；
Computation chip uses high-precision measuring chip ATT7022EU, the 6 tunnels collection that high-precision measuring chip ATT7022EU is included
Passage is connected with the output end of three road voltage acquisition units and the output end of three road current acquisition units successively, high-precision measuring core
The chip selection signal of piece ATT7022EU selects end to be connected with the computation chip piece of main control chip, high-precision measuring chip ATT7022EU's
Output end is connected with the continuous data input of main control chip.
2. a kind of metering circuit for being applied to multichannel ac digital electric energy meter as claimed in claim 1, it is characterised in that electricity
Source module includes ten two-way power supply power subsystems, and ten two-way power supply power supplys and 12 road voltage x current collecting units are corresponded and connected
Connect, rectification circuit, lightning protection circuit are included per power supply unit all the way, overvoltage circuit, current circuit, transforming circuit, switch electricity is crossed
Source integrated circuit and photoelectric coupled circuit, it is defeated with one of switch power integrated circuit after the rectified circuit in loop to be measured, transforming circuit
Enter end connection, be connected with an input of switch power integrated circuit after the rectified circuit in loop to be measured, lightning protection circuit, transformation
One output end of circuit is connected with the input for crossing current circuit, exports supply voltage, crosses the output end and optocoupler electricity of current circuit
Road connects, and another output end of transforming circuit connects after being connected with photoelectric coupled circuit with an input of switch power integrated circuit
Connect.
3. a kind of metering circuit for being applied to multichannel ac digital electric energy meter as claimed in claim 1, it is characterised in that main
Chip select pins of the pin RA4, pin RA5, pin RE0, pin RE1 of control chip U2 successively with four computation chips is connected, main
Output ends of the pin RA2, pin RA3, pin RC1, pin RC0 of control chip U2 successively with four computation chips is connected；
The pin 2 of clock chip U4 one end respectively with crystal oscillator chip Y2, one end of electric capacity C31 are connected, pin 3 and crystal oscillator chip
One end connection of the other end, electric capacity C32 of Y2, the pin 5 of clock chip U4 is connected with the pin NC of main control chip U2, clock core
The pin 6 of piece U4 is connected with the pin RB7 of main control chip U2, and the pin 7 of clock chip U4 connects with the pin RB6 of main control chip U2
Connect；
The pin 1 of storage chip U7 is connected with the pin RD4 of main control chip U2, pin 2 and the main control chip U2 of storage chip U7
Pin RD5 connections, the pin 5 of storage chip U7 is connected with the pin RB0 of main control chip U2, the pin 6 of storage chip U7 and
The pin RD7 connections of main control chip U2, the pin 3 of storage chip U7 is connected with the pin RD6 of main control chip U2；
The pin RB2 of main control chip U2 is connected after being connected with resistance R12 with the base stage of triode Q1, outside the colelctor electrode of triode Q1
Power supply module output voltage is connect, the emitter stage of triode Q1 is connected after being connected with resistance Rb1 with the pin 1 of backlight B1, backlight
The pin 2 of plate B1 is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621380965.9U CN206300999U (en) | 2016-12-15 | 2016-12-15 | A kind of metering circuit for being applied to multichannel ac digital electric energy meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621380965.9U CN206300999U (en) | 2016-12-15 | 2016-12-15 | A kind of metering circuit for being applied to multichannel ac digital electric energy meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206300999U true CN206300999U (en) | 2017-07-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621380965.9U Active CN206300999U (en) | 2016-12-15 | 2016-12-15 | A kind of metering circuit for being applied to multichannel ac digital electric energy meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206300999U (en) |
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2016
- 2016-12-15 CN CN201621380965.9U patent/CN206300999U/en active Active
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