CN107070259A - Power circuit for electric energy meter - Google Patents
Power circuit for electric energy meter Download PDFInfo
- Publication number
- CN107070259A CN107070259A CN201611146135.4A CN201611146135A CN107070259A CN 107070259 A CN107070259 A CN 107070259A CN 201611146135 A CN201611146135 A CN 201611146135A CN 107070259 A CN107070259 A CN 107070259A
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- Prior art keywords
- pin
- circuit
- coil
- voltage stabilizing
- stabilizing chip
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Rectifiers (AREA)
Abstract
Power circuit on intelligent electric energy meter, power circuit includes transformer, rectification circuit and mu balanced circuit, and mu balanced circuit includes the first mu balanced circuit and the second mu balanced circuit, and transformer is sequentially connected with rectification circuit, mu balanced circuit；The primary coil of transformer includes first coil, the second coil, two ends of the live wire L, zero line N of power line respectively with the first coil of transformer are connected, and the second coil other end of node, transformer between second coil one end of transformer and the zero line N of the power line is connected with the second mu balanced circuit respectively；The secondary coil of transformer includes tertiary coil and the 4th coil, and the two ends of tertiary coil are connected with rectification circuit circuit；The two ends of 4th coil are connected with the first mu balanced circuit.This power circuit defencive function such as there is lightning protection, anti-zero line grounding or zero line not to connect, anti-interference is stronger；Electric current is more stablized, and improves electric energy meter reliability；Stable operating voltage is provided for each functional circuit or communication mode of electric energy meter.
Description
Technical field
The invention belongs to electronic electricity meter technical field, and in particular to a kind of power circuit on electric energy meter.
Background technology
In daily life, what ordinary residence user installation was used is all two grades of electric energy meters, and conventional Household electric energy table is mostly
Function is relatively simple, in order to reduce the area occupied for taking pcb board, reduces the wiring framework in electric energy meter, circuit construction of electric power
It is mostly fairly simple, therefore stability and antijamming capability are all poor, and the quality of power-supply system directly determines electronic type electricity
The quality of energy table.Moreover, with the development and popularization of microelectric technique and single-chip microcomputer, novel intelligent observation and control technology is sent out rapidly
Exhibition, the electronic electric energy meter using single-chip microcomputer as core shows its obvious advantage, and traditional single power supply pattern realizes single letter
The ammeter of number communication, function is also relatively simple, it is impossible to meet the demand of existing social development.
The content of the invention
Poor the invention aims to solve current power circuit stability, function is single, there is electromagnetism between circuit
There is provided a kind of power circuit on electric energy meter for interference problem.
In order to reach foregoing invention purpose, the present invention uses following technical scheme：
Power circuit on intelligent electric energy meter, the power circuit includes transformer, rectification circuit and mu balanced circuit,
The mu balanced circuit includes the first mu balanced circuit and the second mu balanced circuit, and the transformer and rectification circuit, mu balanced circuit are successively
Connection；The primary coil of transformer includes first coil, the second coil, live wire L, the zero line N of power line respectively with transformer
The two ends of first coil are connected, the node, transformer between second coil one end of transformer and the zero line N of the power line
The second coil other end is connected with the second mu balanced circuit respectively；The secondary coil of transformer includes tertiary coil and the 4th coil,
The two ends of the tertiary coil are connected with rectification circuit circuit；The two ends of 4th coil are connected with the first mu balanced circuit.
Further, the rectification circuit includes rectifier bridge stack BD1 and electrochemical capacitor EC1,6 pin of tertiary coil, 7 pin difference
It is connected with rectifier bridge stack the BD1 pin of input 3,4 pin, rectifier bridge stack BD1 output head anode connects with electrochemical capacitor EC1 positive pole
Connect, rectifier bridge stack BD1 negative pole of output end is connected with electrochemical capacitor EC1 negative pole, rectifier bridge stack BD1 output head anode and electricity
Solve the node output power supply VDCC between electric capacity EC1 positive pole, rectifier bridge stack BD1 negative pole of output end and electrochemical capacitor
The node ground connection of both EC1 negative poles.The power supply VDCC of rectification circuit output is carrier communication circuit and on-load switch electricity
Road is powered.
Further, first mu balanced circuit includes diode D3, voltage stabilizing chip IC1, electric capacity C51, the 9 of the 4th coil
Positive pole, the voltage stabilizing chip IC1 pin of earth terminal 2 of pin, 10 pin respectively with diode D3 are connected, diode D3 negative pole and voltage stabilizing core
The piece IC1 pin of input 3 connection, a capacitance C51, institute are concatenated between the voltage stabilizing chip IC1 pin of earth terminal 2, the pin of output end 1
State output supply voltage+12V485, the voltage stabilizing chip between diode D3 negative pole and the voltage stabilizing chip IC1 pin of input 3
The pin of earth terminal 2 of node output supply voltage V485, the voltage stabilizing chip IC1 between the IC1 pin of output end 1 and electric capacity C51
Node ground connection between electric capacity C51.(ground connection is digitally entirely isolated with others with the various regions on simulation ground.Get
The anti-safety effect artificially attacked.) first mu balanced circuit by diode D3 rectification and the pressure stabilization function of voltage stabilizing chip after
Output voltage is powered to RS485 telecommunication circuits.First mu balanced circuit is connected with RS485 telecommunication circuits.
Further, parallel connection is set between the pin of earth terminal 2 of the voltage stabilizing chip IC1, the voltage stabilizing chip IC1 pin of input 3
Electrochemical capacitor EC3, electric capacity C44 are equipped with, electrochemical capacitor EC3 positive pole is connected with the voltage stabilizing chip IC1 pin of input 3.EC3、C44
There are filtering decoupling effect, stabilized power supply circuit.
Further, the rectification circuit, three circuits of the first mu balanced circuit and the second mu balanced circuit are not altogether.Potential circuit
The voltage stabilization of offer and with good Electro Magnetic Compatibility.
Further, second mu balanced circuit includes diode D4, voltage stabilizing chip IC2, electric capacity C60, the 9 of the 4th coil
Positive pole, the voltage stabilizing chip IC2 pin of earth terminal 2 of pin, 10 pin respectively with diode D3 are connected, diode D4 negative pole and voltage stabilizing core
The piece IC2 pin of input 3 connection, it is in parallel provided with string electrochemical capacitor between the voltage stabilizing chip IC2 pin of earth terminal 2, the pin of output end 1
EC5, electric capacity C60, electrochemical capacitor EC5 positive pole are connected with the voltage stabilizing chip IC2 pin of output end 1, and the voltage stabilizing chip IC2's is defeated
The node output supply voltage DVDD gone out between 1 pin of end and electric capacity C60, voltage stabilizing chip the IC2 pin of earth terminal 2, electrochemical capacitor
Node ground connection between EC5, electric capacity C60 three.Supplied by being exported after diode D3 rectification and the pressure stabilization function of voltage stabilizing chip
Piezoelectric voltage DVDD supplies smart circuit meter amount chip circuit and MCU chip partial circuit.
Further, it has been arranged in parallel between the voltage stabilizing chip IC2 pin of earth terminal 2, the voltage stabilizing chip IC2 pin of input 3
Electrochemical capacitor EC4, electric capacity C58, electrochemical capacitor EC4 positive pole are connected with the voltage stabilizing chip IC2 pin of input 3.Electrochemical capacitor
EC4, electric capacity C58 use electric capacity of different sizes, there is filtering decoupling effect, stabilized power supply circuit.
Further, the power circuit also includes power protecting circuit, and the power protecting circuit includes piezo-resistance
RR1, thermistor RT1, concatenate a piezo-resistance RR1 between live wire L lines and zero line N lines, piezo-resistance RR1 two ends connect respectively
5 pin, 1 pin of the first coil of transformer, thermistor RT1 is further connected between piezo-resistance RR1 and 1 pin of first coil.
Further, to be additionally provided with one between 5 pin of the first coil of the transformer, 1 pin in parallel with piezo-resistance RR1
Piezo-resistance Ra.Thermistor RT1 can also be less than first device of thermistor RT1 piezo-resistance Ra three legs of formation with resistance
Part, the power protecting circuit more consolidated with piezo-resistance RR1 formation.Especially for lightning protection, anti-zero line grounding or zero line are not
Connect situation, protection transformer and whole power circuit.Thermistor RT1 selects 1~215RM/10 of MZ1106E15 D3 91 3
Pin.
Compared with prior art, beneficial effect is the present invention：The power circuit of this programme have lightning protection, anti-zero line grounding or
Zero line such as does not connect at the defencive function, and anti-interference is stronger；Electric current is more stablized, and improves electric energy meter reliability；For electric energy meter
Each functional circuit or communication mode stable operating voltage is provided.
Brief description of the drawings
Fig. 1 is the power circuit diagram of the present invention.
Embodiment
Explanation is further described to technical scheme below by specific embodiment.
As illustrated, power circuit includes power protecting circuit, transformer, rectification circuit and the first mu balanced circuit, second
Mu balanced circuit, live wire L, zero line N and transformer input first coil connection, the coil of input second of transformer and second
Mu balanced circuit is connected, and the tertiary coil of transformer output end, the 4th coil are connected with rectification circuit, the first mu balanced circuit respectively.
Rectification circuit, three circuits of the first mu balanced circuit and the second mu balanced circuit are not altogether.Power protecting circuit located at live wire, zero line with
Between transformer inputs.
In rectification circuit, 6 pin, 7 pin of tertiary coil are connected with rectifier bridge stack the BD1 pin of input 3,4 pin respectively, rectification
Bridge heap BD1 output head anode is connected with electrochemical capacitor EC1 positive pole, rectifier bridge stack BD1 negative pole of output end and electrochemical capacitor
EC1 negative pole connection, the node output power supply electricity between rectifier bridge stack BD1 output head anode and electrochemical capacitor EC1 positive pole
The node of source VDCC, rectifier bridge stack BD1 negative pole of output end and both electrochemical capacitor EC1 negative poles is grounded.
In first mu balanced circuit, 9 pin of the 4th coil, 10 pin positive poles respectively with diode D3, voltage stabilizing chip IC1 connect
The pin of ground terminal 2 is connected, and diode D3 negative pole is connected with the voltage stabilizing chip IC1 pin of input 3, voltage stabilizing chip IC1 earth terminal 2
The negative pole of capacitance a C51, the diode D3 and the voltage stabilizing chip IC1 pin of input 3 are concatenated between pin, the pin of output end 1
Between output supply voltage+12V485, the voltage stabilizing chip IC1 the pin of output end 1 and electric capacity C51 between node output power supply
Node ground connection between voltage V485, the voltage stabilizing chip IC1 pin of earth terminal 2 and electric capacity C51.Voltage stabilizing chip IC1 ground connection
Electrochemical capacitor EC3, electric capacity C44 are arranged in parallel between the pin of input 3 for holding 2 pin, voltage stabilizing chip IC1, electrochemical capacitor EC3 is just
Pole is connected with the voltage stabilizing chip IC1 pin of input 3.
In second mu balanced circuit, 9 pin of the 4th coil, 10 pin positive poles respectively with diode D3, voltage stabilizing chip IC2 connect
The pin of ground terminal 2 is connected, and diode D4 negative pole is connected with the voltage stabilizing chip IC2 pin of input 3, voltage stabilizing chip IC2 earth terminal 2
It is in parallel provided with string electrochemical capacitor EC5, electric capacity C60, electrochemical capacitor EC5 positive pole and voltage stabilizing chip IC2 between pin, the pin of output end 1
The pin of output end 1 connection, between the pin of output end 1 and electric capacity C60 of the voltage stabilizing chip IC2 node output supply voltage
Node ground connection between DVDD, the voltage stabilizing chip IC2 pin of earth terminal 2, electrochemical capacitor EC5, electric capacity C60 three (is electric energy meter
The simulation of computation chip.).It is arranged in parallel between the voltage stabilizing chip IC2 pin of earth terminal 2, the voltage stabilizing chip IC2 pin of input 3
There are electrochemical capacitor EC4, electric capacity C58, electrochemical capacitor EC4 positive pole is connected with the voltage stabilizing chip IC2 pin of input 3.
Power protecting circuit includes piezo-resistance RR1, thermistor RT1, and a pressure is concatenated between live wire L lines and zero line N lines
Quick resistance RR1, piezo-resistance RR1 two ends connect 5 pin, 1 pin of the first coil of transformer, piezo-resistance RR1 and first respectively
Thermistor RT1 is further connected between 1 pin of coil.
Transformer input is the 220VAC of standard, and the pin of secondary coil the 6th, 7 pin are output as 8V/220MA, secondary
Level coil the 9th pin, 10 pin are output as 11V/20mA.Piezo-resistance RR1 selects the piezo-resistances of S20K 420.Electric capacity EC1 is selected
1000UF/35V/WL 12.5*25, rectifier bridge stack BD1 select MB10S MBS.Diode D3, diode D4 select M7DO-
214AC, electric capacity EC4 select 220UF/35V/WL 10*12.5, electric capacity EC3 to select 100UF/50V/WL 8*11.5, electric capacity EC5
From 100UF//10V/WL 5*11, electric capacity C44, electric capacity C58, electric capacity C51, electric capacity C60 select 100NF 10%0603.Surely
Chip IC 1, voltage stabilizing chip IC2 are pressed from the model of 78L05SOT-89 length electricity.Thermistor RT1 from MZ1106E15 1~
The pin of 215RM/10 D3 91 3.
The rectification circuit of this power circuit is connected with carrier communication module, first mu balanced circuit of this power circuit with
RS485 communication modules are connected, and the second mu balanced circuit is connected with computation chip module.The electric current that computation chip module includes zero line is adopted
The current sampling circuit of sample circuit and live wire.
Carrier communication module, RS485 communication modules, computation chip module described in the present embodiment are mould commonly used in the art
Block.
It is above the preferred embodiment of the present invention, protection scope of the present invention is not limited, for people in the art
Deformation and improvement that member makes according to the mentality of designing of the present invention, should all be considered as within protection scope of the present invention.
Claims (10)
1. for the power circuit on intelligent electric energy meter, it is characterised in that the power circuit include transformer, rectification circuit and
Mu balanced circuit, the mu balanced circuit includes the first mu balanced circuit and the second mu balanced circuit, the transformer and rectification circuit, voltage stabilizing
Circuit is sequentially connected；The primary coil of transformer includes first coil, the second coil, live wire L, the zero line N of power line respectively with
The two ends connection of the first coil of transformer, node between second coil one end of transformer and the zero line N of the power line,
The second coil other end of transformer is connected with the second mu balanced circuit respectively；The secondary coil of transformer includes tertiary coil and the
Four coils, the two ends of the tertiary coil are connected with rectification circuit circuit；The two ends of 4th coil and the first mu balanced circuit
Connection.
2. the power circuit according to claim 1 on intelligent electric energy meter, it is characterised in that the rectification circuit bag
Include rectifier bridge stack BD1 and electrochemical capacitor EC1,6 pin, the pin of input 3,4 pin of 7 pin respectively with rectifier bridge stack BD1 of tertiary coil
Connection, rectifier bridge stack BD1 output head anode is connected with electrochemical capacitor EC1 positive pole, rectifier bridge stack BD1 negative pole of output end and
Electrochemical capacitor EC1 negative pole connection, the node between rectifier bridge stack BD1 output head anode and electrochemical capacitor EC1 positive pole is defeated
Go out power supply VDCC, the node of rectifier bridge stack BD1 negative pole of output end and both electrochemical capacitor EC1 negative poles is grounded.
3. the power circuit according to claim 1 on intelligent electric energy meter, it is characterised in that the first voltage stabilizing electricity
Road includes diode D3, voltage stabilizing chip IC1, electric capacity C51,9 pin of the 4th coil, 10 pin positive pole respectively with diode D3, steady
The pin of earth terminal 2 connection of chip IC 1 is pressed, diode D3 negative pole is connected with the voltage stabilizing chip IC1 pin of input 3, voltage stabilizing chip
The negative pole and voltage stabilizing chip IC1 of capacitance a C51, the diode D3 is concatenated between the IC1 pin of earth terminal 2, the pin of output end 1
The pin of input 3 between output supply voltage+12V485, the voltage stabilizing chip IC1 the pin of output end 1 and electric capacity C51 between
Node ground connection between node output supply voltage V485, the voltage stabilizing chip IC1 pin of earth terminal 2 and electric capacity C51.
4. the power circuit according to claim 3 on intelligent electric energy meter, it is characterised in that the voltage stabilizing chip
Electrochemical capacitor EC3, electric capacity C44, electrolysis electricity have been arranged in parallel between the IC1 pin of earth terminal 2, the voltage stabilizing chip IC1 pin of input 3
The positive pole for holding EC3 is connected with the voltage stabilizing chip IC1 pin of input 3.
5. the power circuit according to claim 1 on intelligent electric energy meter, it is characterised in that the rectification circuit,
Three circuits of first mu balanced circuit and the second mu balanced circuit are not altogether.
6. the power circuit being used for according to claim 1 or 5 on intelligent electric energy meter, it is characterised in that described second is steady
Volt circuit includes diode D4, voltage stabilizing chip IC2, electric capacity C60,9 pin of the 4th coil, 10 pin respectively with diode D3 just
Pole, the voltage stabilizing chip IC2 pin of earth terminal 2 connection, diode D4 negative pole are connected with the voltage stabilizing chip IC2 pin of input 3, voltage stabilizing
In parallel provided with string electrochemical capacitor EC5, electric capacity C60 between the pin of earth terminal 2 of chip IC 2, the pin of output end 1, electrochemical capacitor EC5 is just
Pole is connected with the voltage stabilizing chip IC2 pin of output end 1, the node between the pin of output end 1 and electric capacity C60 of the voltage stabilizing chip IC2
Supply voltage DVDD is exported, the node between the voltage stabilizing chip IC2 pin of earth terminal 2, electrochemical capacitor EC5, electric capacity C60 three connects
Ground.Smart circuit meter amount is supplied by exporting supply voltage DVDD after diode D3 rectification and the pressure stabilization function of voltage stabilizing chip
Chip circuit and MCU chip partial circuit.
7. the power circuit according to claim 6 on intelligent electric energy meter, it is characterised in that voltage stabilizing chip IC2's
Electrochemical capacitor EC4, electric capacity C58, electrochemical capacitor EC4 have been arranged in parallel between the pin of earth terminal 2, the voltage stabilizing chip IC2 pin of input 3
Positive pole be connected with the voltage stabilizing chip IC2 pin of input 3.
8. the power circuit according to claim 1 on intelligent electric energy meter, it is characterised in that the power circuit is also
Including power protecting circuit, the power protecting circuit includes piezo-resistance RR1, thermistor RT1, live wire L lines and zero line N lines
Between concatenate a piezo-resistance RR1, piezo-resistance RR1 two ends connect 5 pin, 1 pin of the first coil of transformer, pressure-sensitive electricity respectively
Thermistor RT1 is further connected between resistance RR1 and 1 pin of first coil.
9. the power circuit according to claim 8 on intelligent electric energy meter, it is characterised in that the of the transformer
A piezo-resistance Ra in parallel with piezo-resistance RR1 is additionally provided between 5 pin of one coil, 1 pin.
10. the power circuit being used on intelligent electric energy meter according to claim 8 or claim 9, it is characterised in that shown temperature-sensitive electricity
Hinder RT1 and select the pin of 1~215RM/10 of MZ1106E15 D3 91 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611146135.4A CN107070259B (en) | 2016-12-13 | 2016-12-13 | Power supply circuit for electric energy meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611146135.4A CN107070259B (en) | 2016-12-13 | 2016-12-13 | Power supply circuit for electric energy meter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107070259A true CN107070259A (en) | 2017-08-18 |
| CN107070259B CN107070259B (en) | 2023-08-25 |
Family
ID=59619306
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611146135.4A Active CN107070259B (en) | 2016-12-13 | 2016-12-13 | Power supply circuit for electric energy meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107070259B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108092529A (en) * | 2017-12-27 | 2018-05-29 | 浙江恒业电子有限公司 | A kind of Three phase electrical energy meter electricity source circuit |
| CN108233722A (en) * | 2018-03-23 | 2018-06-29 | 山东恒德智能装备科技有限公司 | A kind of DC-DC DC voltage-stabilizings multiple power supplies output circuit |
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| CN206650592U (en) * | 2016-12-13 | 2017-11-17 | 浙江恒业电子有限公司 | Power circuit for electric energy meter |
| CN108667292A (en) * | 2018-05-18 | 2018-10-16 | 重庆斯微奇电子技术有限公司 | A kind of input voltage feed forward voltage type PWM control circuit |
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| CN2552047Y (en) * | 2002-06-19 | 2003-05-21 | 深圳市跨宏实业有限公司 | Switch power with wide input voltage range |
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| CN108092529A (en) * | 2017-12-27 | 2018-05-29 | 浙江恒业电子有限公司 | A kind of Three phase electrical energy meter electricity source circuit |
| CN108233722A (en) * | 2018-03-23 | 2018-06-29 | 山东恒德智能装备科技有限公司 | A kind of DC-DC DC voltage-stabilizings multiple power supplies output circuit |
| CN108233722B (en) * | 2018-03-23 | 2024-01-16 | 鲁东大学 | DC-DC direct-current voltage-stabilizing multipath power supply output circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107070259B (en) | 2023-08-25 |
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