CN204631123U - A kind of three phase electronic multifunctional electric energy meter - Google Patents
A kind of three phase electronic multifunctional electric energy meter Download PDFInfo
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- CN204631123U CN204631123U CN201520171330.7U CN201520171330U CN204631123U CN 204631123 U CN204631123 U CN 204631123U CN 201520171330 U CN201520171330 U CN 201520171330U CN 204631123 U CN204631123 U CN 204631123U
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- energy meter
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Abstract
The utility model discloses a kind of three phase electronic multifunctional electric energy meter, it comprises power circuit, voltage sampling circuit, current sampling circuit, metering circuit, control circuit, telecommunication circuit, liquid crystal display circuit and protection circuit, power circuit comprises reduction voltage circuit, rectification circuit, filtering circuit, mu balanced circuit and reserve battery, metering circuit processes voltage, current signal, there is provided the continuous datas such as voltage, electric current, power, power factor, electric energy for system, telecommunication circuit comprises RS485 telecommunication circuit and infrared communication circuit; System protection circuit comprises the first protection circuit and the second protection circuit; The utility model arranges the power circuit providing dual power supply, two telecommunication circuits and two protection circuits in three phase electronic multifunctional electric energy meter, and when having a power failure, data are not lost, clock do not stop, and can meet the request for utilization under varying environment; When thunderbolt and forceful electric power misconnection, energy available protecting electric energy meter and telecommunication circuit are not damaged.
Description
Technical field
The utility model relates to electric energy meter technical field, particularly relates to a kind of three phase electronic multifunctional electric energy meter.
Background technology
The design proposal of existing Multi-functional digital display electric energy meter both domestic and external has single-chip and multi-chip two kinds:
Wherein single chip solution (SOC), computation chip and MCU are integrated in chip piece, and its advantage is that the simple cost of circuit is low, shortcoming is that measuring accuracy and clock accuracy are low, poor reliability, does not reach the technical requirement of state's net intelligent electric energy meter, can only be used for designing easy data acquisition instrument;
Wherein multi-chip scheme (combined type scheme), the data such as voltage, electric current, power factor relevant with electric energy metrical by the sampling of special-purpose multifunctional electric energy computation chip, the meritorious forward and reverse electricity of metering; By the management of computing of chip microcontroller data, display, communication, storage and revenue insurance, realize the measuring requirement of tou power price and gradient electricity price.The advantage of multi-chip scheme is that metering and clock accuracy are high, and reliability is high, can meet the technical requirement of State Grid Corporation of China to intelligent electric meter; Shortcoming is that circuit is slightly complicated, and cost is slightly high, is applicable to the senior measuring instrument of design.
On the communication modes of electric energy meter, for being applicable to the different application scenarios such as rural area, city, factory, the technical scheme that there is the electric energy meter comprising the meter reading methods such as infrared communication, RS485 serial communication, power communication, GPRS communication exists.But above-mentioned electric energy meter lacks anti-lightning strike and forceful electric power misconnection design, when thunderbolt and forceful electric power misconnection, easily causes communicating circuit to damage, affects electric energy metrical.
Summary of the invention
For overcoming the deficiencies in the prior art, the utility model provides a kind of three phase electronic multifunctional electric energy meter showing accurately, have multiple protection functions.
The utility model for the technical scheme reaching above-mentioned technical purpose and adopt is: a kind of three phase electronic multifunctional electric energy meter; comprise power circuit, voltage sampling circuit, current sampling circuit, metering circuit, control circuit, telecommunication circuit, liquid crystal display circuit and protection circuit, wherein:
Described power circuit provides power supply for system, comprises reduction voltage circuit, rectification circuit, filtering circuit, mu balanced circuit and reserve battery, and described reduction voltage circuit comprises 3 independently transformers, and each transformer arranges 1 primary coil and 2 secondary coils;
Described voltage sampling circuit comprises 3 independently resistance pressure-dividing network, filtering circuits;
Described current sampling circuit comprises 3 independently current transformer, sampling resistor, filtering circuits;
Described metering circuit processes voltage, current signal, exports meritorious, idle pulse signal, provides the continuous datas such as voltage, electric current, power, power factor, electric energy, comprise measurement IC ATT7022B/C and peripheral circuit for system;
Described control circuit control system is run, and comprises MICROCHIP microprocessor PIC18F6622 and peripheral circuit;
Described telecommunication circuit comprises RS485 telecommunication circuit and infrared communication circuit;
Described liquid crystal display circuit is made up of 2 lcd drive chip PCF8562 and liquid crystal display and peripheral circuit;
Described system protection circuit comprises the first protection circuit and the second protection circuit, and described first protection circuit is located at the input end of power circuit, voltage collection circuit, and described second protection circuit is located at the output terminal of RS485 telecommunication circuit.
Described power circuit exports the separate power supply in two-way road: the first power supply and second source, first power supply provides power supply to control circuit, metering circuit, clock circuit, memory circuit, function button circuit and infrared communication circuit, and second source provides power supply to RS485 telecommunication circuit; During normal work, clock circuit is by the first power source, provides power supply during power failure by reserve battery.
Described RS485 telecommunication circuit is made up of 485 chips and peripheral circuit, and RS485 telecommunication circuit is connected by the UART mouth of 3 photoelectrical couplers and control circuit, I/O port, completes data communication and transmitting-receiving control.
Described infrared communication circuit is made up of infrared receiving circuit and infrared transmitting circuit, and UART mouth, the I/O port of infrared communication circuit and control circuit are connected, and complete data communication and carrier modulation demodulation.
Described first protection circuit comprises 3 independently voltage dependent resistor (VDR), 3 independently thermistors; Under system suffers thunderbolt, superpressure situation, protection system is not destroyed.
Described second protection circuit comprises TVS pipe, thermistor; 485 communication lines are protected not to be damaged when thunderbolt and forceful electric power misconnection.
Data storage circuitry, clock circuit, function button circuit, LED indicating circuit and peripheral circuit is also comprised in described three phase electronic multifunctional electric energy meter.
The beneficial effects of the utility model are: adopt said structure, the power circuit of dual power supply, two telecommunication circuits and two protection circuits can be provided by arranging in three phase electronic multifunctional electric energy meter, and adopt the special metering IC and microprocessor composition measuring accuracy is high, display data and informative multifunctional electric energy meter, and when having a power failure, data are not lost, clock do not stop, and can meet the request for utilization under varying environment; The utility model is when thunderbolt and forceful electric power misconnection, and energy available protecting electric energy meter and telecommunication circuit are not damaged.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is described in further detail.Wherein:
Fig. 1 is the system architecture diagram of the utility model three phase electronic multifunctional electric energy meter;
Fig. 2 is the circuit theory diagrams of the utility model power circuit;
Fig. 3 is the circuit theory diagrams of the utility model voltage sampling circuit;
Fig. 4 is the circuit theory diagrams of the utility model current sampling circuit;
Fig. 5 is the circuit theory diagrams of the utility model metering circuit;
Fig. 6 is the circuit theory diagrams of the utility model first protection circuit;
Fig. 7 is the circuit theory diagrams of the utility model second protection circuit.
Embodiment
By describing technology contents of the present utility model, structural attitude in detail, realized object and effect, accompanying drawing is coordinated to describe in detail below in conjunction with embodiment.
Refer to shown in Fig. 1 to Fig. 7; the utility model three phase electronic multifunctional electric energy meter comprises power circuit 1, voltage sampling circuit 2, current sampling circuit 3, metering circuit 4, control circuit 5, telecommunication circuit 6, liquid crystal display circuit 7 and protection circuit 8, wherein:
Described power circuit 1 provides power supply for system, comprises reduction voltage circuit, rectification circuit, filtering circuit, mu balanced circuit and reserve battery, and described reduction voltage circuit comprises 3 independently transformers, and each transformer arranges 1 primary coil and 2 secondary coils;
Described voltage sampling circuit 2 comprises 3 independently resistance pressure-dividing network, filtering circuits;
Described current sampling circuit 3 comprises 3 independently current transformer, sampling resistor, filtering circuits;
Described metering circuit 4 pairs of voltages, current signals process, and export meritorious, idle pulse signal, provide the continuous datas such as voltage, electric current, power, power factor, electric energy, comprise measurement IC ATT7022B/C and peripheral circuit for system;
Described control circuit 5 control system is run, and comprises MICROCHIP microprocessor PIC18F6622 and peripheral circuit;
Described telecommunication circuit 6 comprises RS485 telecommunication circuit and infrared communication circuit;
Described liquid crystal display circuit 7 is made up of 2 lcd drive chip PCF8562 and liquid crystal display and peripheral circuit;
Described system protection circuit 8 comprises the first protection circuit 81 and the second protection circuit 82, and described first protection circuit 81 is located at the input end of power circuit, voltage collection circuit, and described second protection circuit 82 is located at the output terminal of RS485 telecommunication circuit.
In the present embodiment, the input end of voltage sampling circuit 2 connects Ua, Ub, Uc, Un, the output terminal of voltage sampling circuit 2 connects metering circuit 4, and voltage U a, Ub, Uc are converted to low-voltage and are input to computation chip by voltage sampling circuit 2, complete the collection of voltage signal.Voltage sampling circuit 2 provides voltage signal for system.
The input end of current sampling circuit 3 connects Ia, Ib, Ic, and the output terminal of current sampling circuit 3 connects metering circuit 4, and electric current I a, Ib, Ic are converted to voltage signal and are input to computation chip by current sampling circuit 3, complete the collection of current signal.Current sampling circuit 3 provides current signal for system.
External crystal-controlled oscillation connects the input end of clock of computation chip, for computation chip provides clock.
The I/O port of the microprocessor of SPI data output end DOUT, DIN, SCLK, CS connection control circuit 5 of the measurement IC ATT7022B/C of metering circuit 4, data communication and control is completed by spi bus and related protocol, the I/O port of the microprocessor of the RESET port connection control circuit 5 of the measurement IC ATT7022B/C of metering circuit 4,2 pulse output ends of computation chip connect 2 independently photoelectrical couplers, export meritorious pulse signal and idle pulse signal.
The clock I/O port of the microprocessor PIC18F6622 of control circuit 5 connects external crystal-controlled oscillation, and external crystal-controlled oscillation provides clock to control circuit; The SPI port of the microprocessor PIC18F6622 of control circuit connects the SPI port of the computation chip of metering circuit.
The I2C port of the microprocessor PIC18F6622 of control circuit 5 connects the I2C port of the lcd drive chip of liquid crystal display circuit, the display data of liquid crystal display are exported by the microprocessor of control circuit 5, the continuous datas such as voltage, electric current, power, power factor, electricity, requirement, requirement time can be shown, can the status information such as display time interval, rate, decompression, defluidization.
Described power circuit 1 exports the separate power supply in two-way road: the first power supply and second source, first power supply provides power supply to control circuit 5, metering circuit 4, clock circuit, memory circuit, function button circuit and infrared communication circuit, and second source provides power supply to RS485 telecommunication circuit; During normal work, clock circuit is by the first power source, provides power supply during power failure by reserve battery; The input end of power circuit connects Ua, Ub, Uc, Un.
Described RS485 telecommunication circuit is made up of 485 chips and peripheral circuit, and RS485 telecommunication circuit is connected by the UART mouth of 3 photoelectrical couplers and control circuit, I/O port, completes data communication and transmitting-receiving control; Be provided with two independently RS485 telecommunication circuits in circuit, the power input of RS485 telecommunication circuit connects the second source of power circuit, and RS485 telecommunication circuit output terminal is connected to pull-up resistor, pull down resistor, pull-up resistor respectively.
Described infrared communication circuit is made up of infrared receiving circuit and infrared transmitting circuit, and UART mouth, the I/O port of infrared communication circuit and control circuit are connected, and complete data communication and carrier modulation demodulation; Infrared communication circuit can receive and send the infrared communication data of 38kHz modulation.
Described first protection circuit 81 comprises 3 independently voltage dependent resistor (VDR), 3 independently thermistors; First protection circuit 81 connects Ua, Ub, Uc, power circuit 1 input end, voltage collection circuit 2 input end, and under system suffers thunderbolt, superpressure situation, protection system is not destroyed.
Described second protection circuit 82 comprises TVS pipe, thermistor, and 2 road RS485 telecommunication circuits connect all separately the second protection circuit 82; Protection RS485 communication line is not damaged when thunderbolt and forceful electric power misconnection.
Described second protection circuit 82 input end connects RS485 telecommunication circuit output terminal, output terminal connectivity port A1, B1, A2, B2.
Data storage circuitry, clock circuit, function button circuit, LED indicating circuit and peripheral circuit is also comprised in described three phase electronic multifunctional electric energy meter.
Described data storage circuitry is made up of 3 pin-saving chip 24LC512 and peripheral circuit, the storage chip of data storage circuitry is connected with control circuit by I2C bus, memory circuit preserves supplemental characteristic, the service data of electric energy meter, and after energising, data are not lost.
Described clock circuit is made up of the real-time timepiece chip ISL12022 with temperature compensation and peripheral circuit, the power supply of clock circuit connects power supply 1 and the battery 2 of power circuit, the clock chip ISL12022 of clock circuit is connected with the microprocessor of control circuit by I2C bus, microprocessor reads clock chip by I2C bus protocol and obtains system clock data, when clock continues to walk during power failure.
Described function button circuit is made up of 2 reading buttons, 1 program switch button, 1 uncap alarm key and peripheral circuit, the GPIO mouth of function button circuit connection control circuit microprocessor, function button circuit completes that liquid crystal turns over screen, program enable switch, the functions such as warning of uncapping, reading button realizes the page turn over operation of liquid crystal display, programming button realizes the switch of program enable, and alarm key of uncapping realizes record and the warning of event of uncapping.
The I2C port of the microprocessor PIC18F6622 of control circuit 5 connects the I2C port of the clock chip of clock circuit, the I2C port of the microprocessor PIC18F6622 of control circuit 5 connects the I2C port of the clock chip of memory circuit, I/O port linkage function key circuit, LED indicating circuit, the buzzer circuit of the microprocessor PIC18F6622 of control circuit 5.
The foregoing is only embodiment of the present utility model; not thereby the scope of the claims of the present utility model is limited; every equivalent structure transformation utilizing the utility model instructions and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (7)
1. a three phase electronic multifunctional electric energy meter, is characterized in that: comprise power circuit, voltage sampling circuit, current sampling circuit, metering circuit, control circuit, telecommunication circuit, liquid crystal display circuit and protection circuit, wherein:
Described power circuit provides power supply for system, comprises reduction voltage circuit, rectification circuit, filtering circuit, mu balanced circuit and reserve battery, and described reduction voltage circuit comprises 3 independently transformers, and each transformer arranges 1 primary coil and 2 secondary coils;
Described voltage sampling circuit comprises 3 independently resistance pressure-dividing network, filtering circuits;
Described current sampling circuit comprises 3 independently current transformer, sampling resistor, filtering circuits;
Described metering circuit processes voltage, current signal, exports meritorious, idle pulse signal, provides the continuous datas such as voltage, electric current, power, power factor, electric energy, comprise measurement IC ATT7022B/C and peripheral circuit for system;
Described control circuit control system is run, and comprises MICROCHIP microprocessor PIC18F6622 and peripheral circuit;
Described telecommunication circuit comprises RS485 telecommunication circuit and infrared communication circuit;
Described liquid crystal display circuit is made up of 2 lcd drive chip PCF8562 and liquid crystal display and peripheral circuit;
Described system protection circuit comprises the first protection circuit and the second protection circuit, and described first protection circuit is located at the input end of power circuit, voltage collection circuit, and described second protection circuit is located at the output terminal of RS485 telecommunication circuit.
2. a kind of three phase electronic multifunctional electric energy meter according to claim 1, it is characterized in that: described power circuit exports the separate power supply in two-way road: the first power supply and second source, first power supply provides power supply to control circuit, metering circuit, clock circuit, memory circuit, function button circuit and infrared communication circuit, and second source provides power supply to RS485 telecommunication circuit.
3. a kind of three phase electronic multifunctional electric energy meter according to claim 1, it is characterized in that: described RS485 telecommunication circuit is made up of 485 chips and peripheral circuit, RS485 telecommunication circuit is connected by the UART mouth of 3 photoelectrical couplers and control circuit, I/O port.
4. a kind of three phase electronic multifunctional electric energy meter according to claim 1, is characterized in that: described infrared communication circuit is made up of infrared receiving circuit and infrared transmitting circuit, and UART mouth, the I/O port of infrared communication circuit and control circuit are connected.
5. a kind of three phase electronic multifunctional electric energy meter according to claim 1, is characterized in that: described first protection circuit comprises 3 independently voltage dependent resistor (VDR), 3 independently thermistors.
6. a kind of three phase electronic multifunctional electric energy meter according to claim 1, is characterized in that: described second protection circuit comprises TVS pipe, thermistor.
7. a kind of three phase electronic multifunctional electric energy meter according to claim 1, is characterized in that: also comprise data storage circuitry, clock circuit, function button circuit, LED indicating circuit and peripheral circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520171330.7U CN204631123U (en) | 2015-03-25 | 2015-03-25 | A kind of three phase electronic multifunctional electric energy meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520171330.7U CN204631123U (en) | 2015-03-25 | 2015-03-25 | A kind of three phase electronic multifunctional electric energy meter |
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| Publication Number | Publication Date |
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| CN204631123U true CN204631123U (en) | 2015-09-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520171330.7U Expired - Fee Related CN204631123U (en) | 2015-03-25 | 2015-03-25 | A kind of three phase electronic multifunctional electric energy meter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106353583A (en) * | 2016-08-03 | 2017-01-25 | 武汉本杰明自动化设备工程有限公司 | Small infrared power factor monitoring device for high-power industrial equipment |
| CN108761160A (en) * | 2018-08-20 | 2018-11-06 | 贵州电网有限责任公司 | A kind of electric energy meter legality measurement and non-legal system functional hardware separated structure |
| CN114814355A (en) * | 2022-06-28 | 2022-07-29 | 石家庄科林电气股份有限公司 | Three-phase meter based on manganin sampling and metering method |
| CN117269598A (en) * | 2023-11-20 | 2023-12-22 | 青岛鼎信通讯股份有限公司 | Multi-loop electric energy meter and electric energy metering system |
-
2015
- 2015-03-25 CN CN201520171330.7U patent/CN204631123U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106353583A (en) * | 2016-08-03 | 2017-01-25 | 武汉本杰明自动化设备工程有限公司 | Small infrared power factor monitoring device for high-power industrial equipment |
| CN108761160A (en) * | 2018-08-20 | 2018-11-06 | 贵州电网有限责任公司 | A kind of electric energy meter legality measurement and non-legal system functional hardware separated structure |
| CN114814355A (en) * | 2022-06-28 | 2022-07-29 | 石家庄科林电气股份有限公司 | Three-phase meter based on manganin sampling and metering method |
| CN114814355B (en) * | 2022-06-28 | 2022-09-13 | 石家庄科林电气股份有限公司 | Three-phase meter based on manganin sampling and metering method |
| CN117269598A (en) * | 2023-11-20 | 2023-12-22 | 青岛鼎信通讯股份有限公司 | Multi-loop electric energy meter and electric energy metering system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150909 Termination date: 20170325 |
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| CF01 | Termination of patent right due to non-payment of annual fee |