CN206300979U - A kind of multichannel ac digital electric energy meter - Google Patents
A kind of multichannel ac digital electric energy meter Download PDFInfo
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- CN206300979U CN206300979U CN201621378356.XU CN201621378356U CN206300979U CN 206300979 U CN206300979 U CN 206300979U CN 201621378356 U CN201621378356 U CN 201621378356U CN 206300979 U CN206300979 U CN 206300979U
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Abstract
The utility model discloses a kind of multichannel ac digital electric energy meter, including metering module, power module, main control module, communication module and human-computer interaction module；Loop to be measured is connected with power module and metering module respectively, and power module is connected with metering module, main control module, communication module and human-computer interaction module respectively；Metering module includes 12 road voltage x current collecting units and four computation chips, 12 road voltage x current collecting units gather the voltage and current signal in 12 tunnels loop to be measured, and output end of the input per a piece of computation chip respectively with three road voltage x current collecting units is connected.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 electricity meter, especially a kind of comprising multiple separate electric energy metering modules
With the ac digital electric energy meter of power module.
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 multichannel ac digital electric energy meter, including metering module, power module,
Main control module, communication module and human-computer interaction module；Loop to be measured is connected with power module and metering module respectively, power module
It is connected with metering module, main control module, communication module and human-computer interaction module respectively；
Metering module includes 12 road voltage x current collecting units and four computation chips, and 12 road voltage x current collections are single
Unit collection 12 tunnels loop to be measured voltage and current signal, per a piece of computation chip input respectively with three road voltage x currents
The output end connection of collecting unit；
Power module includes ten two-way power supply power subsystems, ten two-way power supply power supplys and 12 road voltage x current collecting units
Connect one to one, often power supply unit includes rectification circuit, lightning protection circuit, excessively overvoltage circuit, current circuit, change piezoelectricity all the way
Road, switch power integrated circuit and photoelectric coupled circuit, with switch power integrated circuit after the rectified circuit in loop to be measured, transforming circuit
An input connection, with an input of switch power integrated circuit after the rectified circuit in loop to be measured, lightning protection circuit
Connection a, output end of transforming circuit is connected with the input for crossing current circuit, exports supply voltage, crosses the output end of current circuit
Be connected with photoelectric coupled circuit, another output end of transforming circuit be connected with photoelectric coupled circuit after with switch power integrated circuit
Input is connected；
Main control module include main control chip, clock chip and storage chip, clock chip, storage chip respectively with master control core
Piece is connected；The output end of computation chip is connected with the voltage x current data terminal of main control chip, the control end of computation chip and master control
The computation chip piece of chip selects end to connect, and the teledata end of main control chip is connected with the input/output terminal of communication unit.
Further, voltage x current collecting unit includes voltage acquisition unit and current acquisition unit, voltage acquisition unit
Including voltage transformer, the input of voltage transformer is connected with loop to be measured all the way, a lead-out terminal of voltage transformer
After being connected with first voltage resistance be grounded, the lead-out terminal be connected with second voltage resistance after output voltage signal, second voltage
It is grounded after resistance and the first capacitance connection；Another output end of voltage transformer is grounded after being connected with tertiary voltage resistance, should
Lead-out terminal be connected with the 4th voltage resistance after output voltage signal, after the 4th voltage resistance and the second capacitance connection be grounded；
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.
Further, computation chip uses high-precision measuring chip ATT7022EU, high-precision measuring chip ATT7022EU
Comprising 6 road acquisition channels connect with the output end of the output end of three road voltage acquisition units and three road current acquisition units successively
Connect, 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-precision measuring
The output end of chip ATT7022EU is connected with the continuous data input of main control chip.
Further, power circuit includes commutation diode D9, self- recoverage insurance RV1, self- recoverage insurance RV2, self- recoverage
Insurance RV3, transformer, trifocal switch power integrated circuit IC1, optical coupler, the input of commutation diode D9 with treat the survey time
The live wire connection on road, the output end of commutation diode D9 be connected with self- recoverage insurance RV1, indicator lamp all the way after ground connection, all the way with
One end connection of protective tube RF1, the other end of protective tube RF1 insures one end of RV3 and the coil of transformer with self- recoverage respectively
The terminal 6 of TIB is connected, the zero line in loop to be measured be connected with self- recoverage insurance RV2 all the way after ground connection, another road respectively with self- recoverage
Insure RV3 the other end and trifocal switch power integrated circuit IC1 S ends connection, the terminal 8 of the coil T1B of transformer with
The D ends connection of trifocal switch power integrated circuit IC1, the terminal 3 of the coil T1A of transformer is after diode D3, inductance L1
Supply voltage is exported all the way, is connected with one end of resistance R3 and one end of resistance R4 respectively all the way, the other end and light of resistance R3
The terminal 1 of the input U1A of coupling device is connected, the other end of resistance R4 one end, voltage-regulator diode IC2, electricity respectively with electric capacity C12
Hinder one end connection of R5, the input after the other end, voltage-regulator diode, the other end connection of resistance R5 of electric capacity C12 with optical coupler
Hold U1A terminal 2 connect, the terminal 3 of the output end U1B of optical coupler be connected with inductance L2 after with the integrated electricity of trifocal Switching Power Supply
The C-terminal connection of road IC1, the S after the other end and resistance R2, electric capacity C3 of inductance L2 with trifocal switch power integrated circuit IC1
End connection, the terminal 6 of the coil T1C of the terminal 4 of the output end U1B of optical coupler after electric capacity C11 with transformer is connected, transformer
Coil T1C terminal 10 be connected with diode D4 after be connected with the terminal 4 of the output end U1B of optical coupler.
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.
Further, communication unit includes the pin 3 of RS485 transponder chips U10, RS485 transponder chip U10 and master
The pin RC7 connections of control chip U2, the pin 6 of RS485 transponder chips U10 is connected with the pin RC6 of main control chip U2,
RS485 transponder chips U10 pin 4 and pin 5 connection after be connected with the colelctor electrode of triode Q2, the base stage of triode Q2 and
It is connected with the pin RC6 of main control chip U2 after resistance R125 connections, the grounded emitter of triode Q2；RS485 transponder chips
The pin 12 of U10 is connected after being connected with thermistor F5 with the sending and receiving end of the RS485 transponder chips in strange land, RS485 transceivers
The pin 13 of chip U10 is connected after being connected with thermistor F6 with the sending and receiving end of the RS485 transponder chips in strange land.
Further, human-computer interaction module includes push-button unit and display unit, and push-button unit includes key switch S1, presses
Key switch S2, key switch S3, key switch S4, one end of key switch S1, one end of key switch S2, key switch S3
One end, one end pin RD0 successively with main control chip of key switch S4, pin RD1, pin RD3, pin RD2 are connected；Button
Switch the other end of S1, the other end of key switch S2, the other end of key switch S3, key switch S4 the other end successively with
It is grounded after resistance R1, resistance R4, resistance R6, resistance R9；
Display unit includes chip of LCD J2, and the pin 1 of chip of LCD J2 connects with the pin RA1 of main control chip
Connect, pin 2 is connected with the pin RA0 of main control chip U2, and pin 12 is connected with the pin of main control chip, pin 13 and main control chip
Pin VPP connection.
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 multichannel ac digital electric energy meter structure schematic diagram；
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；
Figure 32 is communication unit circuit diagram；
Figure 33 is push-button unit circuit diagram；
Figure 34 is display unit circuit figure.
Specific embodiment
It is as shown in figure 1, a kind of multichannel ac digital electric energy meter including metering module, power module, main control module, logical
Letter module and human-computer interaction module；Loop to be measured is connected with power module and metering module respectively, power module respectively with metering
The connection of module, main control module, communication module and human-computer interaction module.
Metering module includes 12 road voltage x current collecting units and four computation chips, and 12 road voltage x current collections are single
Unit collection 12 tunnels loop to be measured voltage and current signal, per a piece of computation chip input respectively with three road voltage x currents
The output end connection of collecting unit.
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 circuit include commutation diode D9, self- recoverage insurance RV1, self- recoverage insurance RV2, from extensive
Double insurance RV3, transformer, trifocal switch power integrated circuit IC1, optical coupler, the input of commutation diode D9 with it is to be measured
The live wire connection in loop, the output end of commutation diode D9 is grounded after being connected with self- recoverage insurance RV1, indicator lamp all the way, all the way
One end with protective tube RF1 is connected, and the other end of protective tube RF1 insures one end of RV3 and the line of transformer with self- recoverage respectively
The terminal 6 for enclosing TIB is connected, the zero line in loop to be measured be connected with self- recoverage insurance RV2 all the way after ground connection, another road respectively with from extensive
The S ends connection of the other end and trifocal switch power integrated circuit IC1 of double insurance RV3, the terminal 8 of the coil T1B of transformer
D ends with trifocal switch power integrated circuit IC1 are connected, and the terminal 3 of the coil T1A of transformer is through diode D3, inductance L1
Export supply voltage all the way afterwards, be connected with one end of resistance R3 and one end of resistance R4 respectively all the way, the other end of resistance R3 with
The terminal 1 of the input U1A of optical coupler is connected, the other end of resistance R4 one end respectively with electric capacity C12, voltage-regulator diode IC2,
One end connection of resistance R5, it is defeated with optical coupler after the other end, voltage-regulator diode, the other end connection of resistance R5 of electric capacity C12
Enter to hold the terminal 2 of U1A to connect, the terminal 3 of the output end U1B of optical coupler is integrated with trifocal Switching Power Supply after being connected with inductance L2
The C-terminal connection of IC circuit 1, with trifocal switch power integrated circuit IC1's after the other end and resistance R2, electric capacity C3 of inductance L2
S ends connect, and the terminal 6 of the coil T1C of the terminal 4 of the output end U1B of optical coupler after electric capacity C11 with transformer is connected, transformation
The terminal 10 of the coil T1C of device is connected after being connected with diode D4 with the terminal 4 of the output end U1B of optical coupler.
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.
As shown in figure 32, the pin 3 of communication unit including RS485 transponder chips U10, RS485 transponder chip U10 with
The pin RC7 connections of main control chip U2, the pin 6 of RS485 transponder chips U10 is connected with the pin RC6 of main control chip U2,
RS485 transponder chips U10 pin 4 and pin 5 connection after be connected with the colelctor electrode of triode Q2, the base stage of triode Q2 and
It is connected with the pin RC6 of main control chip U2 after resistance R125 connections, the grounded emitter of triode Q2；RS485 transponder chips
The pin 12 of U10 is connected after being connected with thermistor F5 with the sending and receiving end of the RS485 transponder chips in strange land, RS485 transceivers
The pin 13 of chip U10 is connected after being connected with thermistor F6 with the sending and receiving end of the RS485 transponder chips in strange land.
As shown in figure 33, push-button unit includes key switch S1, key switch S2, key switch S3, key switch S4, presses
One end of key switch S1, one end of key switch S2, one end of key switch S3, key switch S4 one end successively with master control core
The pin RD0 of piece, pin RD1, pin RD3, pin RD2 connections；The other end of key switch S1, key switch S2 it is another
End, the other end of the other end of key switch S3, key switch S4 are followed by with resistance R1, resistance R4, resistance R6, resistance R9 successively
Ground.
As shown in figure 34, display unit includes chip of LCD J2, the pin 1 and main control chip of chip of LCD J2
Pin RA1 connections, pin 2 is connected with the pin RA0 of main control chip U2, and pin 12 is connected with the pin of main control chip, pin
13 are connected with the pin VPP of main control chip.
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 (7)
1. a kind of multichannel ac digital electric energy meter, it is characterised in that including metering module, power module, main control module, communication
Module and human-computer interaction module；Loop to be measured is connected with power module and metering module respectively, power module respectively with metering mould
The connection of block, main control module, communication module and human-computer interaction module；
Metering module includes 12 road voltage x current collecting units and four computation chips, and 12 road voltage x current collecting units are adopted
Collect the voltage and current signal in 12 tunnels loop to be measured, the input per a piece of computation chip is gathered with three road voltage x currents respectively
The output end connection of unit；
Power 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 one by one
Correspondence connection, include per power supply unit all the way rectification circuit, lightning protection circuit, overvoltage circuit, cross current circuit, transforming circuit,
Switch power integrated circuit and photoelectric coupled circuit, with switch power integrated circuit after the rectified circuit in loop to be measured, transforming circuit
One input connection a, input after the rectified circuit in loop to be measured, lightning protection circuit with switch power integrated circuit connects
Connect, an output end of transforming circuit be connected with the input for crossing current circuit, export supply voltage, cross current circuit output end and
Photoelectric coupled circuit is connected, and another output end of transforming circuit is defeated with one of switch power integrated circuit after being connected with photoelectric coupled circuit
Enter end connection；
Main control module includes main control chip, clock chip and storage chip, and clock chip, storage chip connect with main control chip respectively
Connect；The output end of computation chip is connected with the voltage x current data terminal of main control chip, the control end and main control chip of computation chip
Computation chip piece select end to connect, the teledata end of main control chip is connected with the input/output terminal of communication unit.
2. a kind of multichannel ac digital electric energy meter as claimed in claim 1, it is characterised in that voltage x current collecting unit bag
Include voltage acquisition unit and current acquisition unit, voltage acquisition unit includes voltage transformer, the input of voltage transformer with
Loop connection to be measured all the way a, lead-out terminal of voltage transformer is grounded after being connected with first voltage resistance, the lead-out terminal
It is grounded after output voltage signal after being connected with second voltage resistance, second voltage resistance and the first capacitance connection；Voltage transformer
Another output end be connected with tertiary voltage resistance after be grounded, the lead-out terminal be connected with the 4th voltage resistance after output voltage
Signal, is grounded after the 4th voltage resistance and the second capacitance 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.
3. a kind of multichannel ac digital electric energy meter as claimed in claim 1, it is characterised in that computation chip is using high accuracy
The 6 road acquisition channels that computation chip ATT7022EU, high-precision measuring chip ATT7022EU are included successively with three road voltage acquisitions
The output end connection of the output end of unit and three road current acquisition units, the chip selection signal of high-precision measuring chip ATT7022EU
End is selected to be connected with the computation chip piece of main control chip, the output end of high-precision measuring chip ATT7022EU and the meter of main control chip
Amount data input pin connection.
4. a kind of multichannel ac digital electric energy meter as claimed in claim 1, it is characterised in that power circuit includes rectification two
Pole pipe D9, self- recoverage insurance RV1, self- recoverage insurance RV2, self- recoverage insurance RV3, transformer, the integrated electricity of trifocal Switching Power Supply
Road IC1, optical coupler, the input of commutation diode D9 are connected with the live wire in loop to be measured, the output end one of commutation diode D9
Road is grounded after being connected with self- recoverage insurance RV1, indicator lamp, and the one end with protective tube RF1 is connected all the way, and protective tube RF1's is another
The terminal 6 of coil TIB of the end respectively with one end and transformer of self- recoverage insurance RV3 is connected, the zero line in loop to be measured all the way with
It is grounded after self- recoverage insurance RV2 connections, the other end and trifocal Switching Power Supply of another road respectively with self- recoverage insurance RV3 are integrated
The S ends connection of IC circuit 1, the terminal 8 of the coil T1B of transformer is connected with the D ends of trifocal switch power integrated circuit IC1,
The terminal 3 of the coil T1A of transformer exports supply voltage all the way after diode D3, inductance L1, all the way respectively with resistance R3's
One end connection of one end and resistance R4, the other end of resistance R3 is connected with the terminal 1 of the input U1A of optical coupler, resistance R4's
Other end one end respectively with electric capacity C12, voltage-regulator diode IC2, one end of resistance R5 are connected, the other end of electric capacity C12, voltage stabilizing
It is connected with the terminal 2 of the input U1A of optical coupler after diode, the other end connection of resistance R5, the output end U1B's of optical coupler
Terminal 3 is connected after being connected with inductance L2 with the C-terminal of trifocal switch power integrated circuit IC1, the other end and resistance of inductance L2
S ends after R2, electric capacity C3 with trifocal switch power integrated circuit IC1 are connected, and the terminal 4 of the output end U1B of optical coupler is through electricity
Hold C11 after be connected with the terminal 6 of the coil T1C of transformer, the terminal 10 of the coil T1C of transformer be connected with diode D4 after and
The terminal 4 of the output end U1B of optical coupler is connected.
5. a kind of multichannel ac digital electric energy meter as claimed in claim 1, it is characterised in that the pin of main control chip U2
The chip select pin of RA4, pin RA5, pin RE0, pin RE1 successively with four computation chips is connected, the pin of main control chip U2
The output end of RA2, pin RA3, pin RC1, pin RC0 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.
6. a kind of multichannel ac digital electric energy meter as claimed in claim 5, it is characterised in that communication unit includes RS485
The pin 3 of transponder chip U10, RS485 transponder chip U10 is connected with the pin RC7 of main control chip U2, RS485 transceivers
The pin 6 of chip U10 is connected with the pin RC6 of main control chip U2, and the pin 4 and pin 5 of RS485 transponder chips U10 are connected
The colelctor electrode with triode Q2 is connected afterwards, the base stage of triode Q2 be connected with resistance R125 after pin RC6 with main control chip U2
Connection, the grounded emitter of triode Q2；The pin 12 of RS485 transponder chips U10 be connected with thermistor F5 after with strange land
RS485 transponder chips sending and receiving end connection, the pin 13 of RS485 transponder chips U10 be connected with thermistor F6 after and
The sending and receiving end connection of the RS485 transponder chips in strange land.
7. a kind of multichannel ac digital electric energy meter as claimed in claim 5, it is characterised in that human-computer interaction module includes pressing
Key unit and display unit, push-button unit include key switch S1, key switch S2, key switch S3, key switch S4, button
Switch one end of S1, one end of key switch S2, one end of key switch S3, key switch S4 one end successively with main control chip
Pin RD0, pin RD1, pin RD3, pin RD2 connection；The other end of key switch S1, the other end of key switch S2,
The other end of key switch S3, the other end of key switch S4 are grounded with after resistance R1, resistance R4, resistance R6, resistance R9 successively；
Display unit includes chip of LCD J2, and the pin 1 of chip of LCD J2 is connected with the pin RA1 of main control chip,
Pin 2 is connected with the pin RA0 of main control chip U2, and pin 12 is connected with the pin of main control chip, pin 13 and main control chip
Pin VPP is connected.
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| CN201621378356.XU CN206300979U (en) | 2016-12-15 | 2016-12-15 | A kind of multichannel ac digital electric energy meter |
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| CN201621378356.XU CN206300979U (en) | 2016-12-15 | 2016-12-15 | A kind of multichannel ac digital electric energy meter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108233957A (en) * | 2017-12-01 | 2018-06-29 | 天地融科技股份有限公司 | Data transmission method for uplink |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108233957A (en) * | 2017-12-01 | 2018-06-29 | 天地融科技股份有限公司 | Data transmission method for uplink |
| CN108233957B (en) * | 2017-12-01 | 2020-06-26 | 天地融科技股份有限公司 | Data transmitting method |
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