CN204631125U - A kind of three-phase LCD Multi-functional digital display electrical measuring meter - Google Patents
A kind of three-phase LCD Multi-functional digital display electrical measuring meter Download PDFInfo
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- CN204631125U CN204631125U CN201520171547.8U CN201520171547U CN204631125U CN 204631125 U CN204631125 U CN 204631125U CN 201520171547 U CN201520171547 U CN 201520171547U CN 204631125 U CN204631125 U CN 204631125U
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Abstract
The utility model discloses a kind of three-phase LCD Multi-functional digital display electrical measuring meter, it comprises metering module circuit, control module circuit, power module circuitry, one end of metering module circuit connects electric current input interface, the other end is connected with control module circuit, the other end of control module circuit connects power module circuitry, the input end of power module circuitry is provided with power input and voltage input end, and the output terminal of power module circuitry is also provided with meritorious pulse output interface and communicates with RS485 output interface; The utility model metering module circuit, control module circuit and power module circuitry can make three pieces of independently circuit boards respectively, and modular board structure of circuit is suitable for Installation and Debugging and repair and maintenance, ensure sampled measurements precision; Microprocessor in control module circuit is shown by built-in LCD driver module Direct driver LCD device, and not needing increases LCD Liquid Crystal Module, decreases the quantity of device, reduces the cost of product.
Description
Technical field
The utility model relates to electric energy meter technical field, particularly relates to a kind of three-phase LCD Multi-functional digital display electrical measuring 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.
Summary of the invention
For overcoming the deficiencies in the prior art, the utility model provides a kind of modular construction, cycle accurate, three-phase LCD Multi-functional digital display electrical measuring meter that cost is low.
The utility model for the technical scheme reaching above-mentioned technical purpose and adopt is: a kind of three-phase LCD Multi-functional digital display electrical measuring meter, comprise metering module circuit, control module circuit, power module circuitry, one end of described metering module circuit connects electric current input interface, the other end is connected with control module circuit, the other end of described control module circuit connects power module circuitry, the input end of described power module circuitry is provided with power input and voltage input end, the output terminal of described power module circuitry is also provided with meritorious pulse output interface and communicates with RS485 output interface, wherein:
Described metering module circuit has been used for sampling metering, comprises the voltage employing circuit that current sampling circuit, metering circuit and described power module circuitry export;
Described control module circuit control system runs, and comprises control circuit, clock circuit, data storage circuitry, infrared communication circuit, function button circuit and LCD liquid crystal display circuit;
Described power module circuitry provides power supply for system, comprises power circuit, RS485 telecommunication circuit, impulse output circuit, and outputs to the voltage sampling circuit in described metering module circuit.
By 3, independently resistance pressure-dividing network, filtering circuit form voltage sampling circuit in described metering module circuit, current sampling circuit by 3 independently current transformer, sampling resistor, filtering circuit form, metering circuit is made up of computation chip ATT7022C/PT and peripheral circuit; Described voltage sampling circuit converts voltage signal Ua, Ub, Uc to low-voltage and is input to computation chip, and voltage sampling circuit provides voltage signal for system; Current sampling circuit converts current signal Ia, Ib, Ic to voltage signal and is input to computation chip, and current sampling circuit provides current signal for system; 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 for system.
Control circuit in described control module circuit is made up of MICROCHIP microprocessor PIC18F86J90 and peripheral circuit, clock circuit is made up of the clock chip RX8025AC with temperature compensation and peripheral circuit, store electricity router chip 24LC04 and peripheral circuit composition, infrared communication circuit is made up of infrared receiving circuit and infrared transmitting circuit, and infrared communication circuit provides UART communication interface, 38kHz modulation interface; Function button circuit is made up of 2 reading buttons, 1 program switch button and peripheral circuit, and LCD liquid crystal display circuit is made up of LCD display part and peripheral circuit, and microprocessor is by built-in LCD driver module Direct driver LCD display part; Described microprocessor completes continuous data process, data display, serial communication, data storage, clock circuit provides system clock data for microprocessor, storage chip is used for supplemental characteristic, the service data of saved system, infrared communication circuit completes data communication and carrier modulation demodulation, the GPIO mouth of function button circuit connection control circuit microprocessor, completes LCD liquid crystal display and turns over screen, program enable switch.
Power circuit in described power module circuitry is made up of reduction voltage circuit, rectification circuit, filtering circuit, mu balanced circuit, reserve battery and peripheral 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 module circuit, metering module circuit, 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, photoelectrical coupler, 485 protection circuits, and impulse output circuit is made up of photoelectrical coupler and peripheral circuit.
Described 485 protection circuits comprise TVS pipe, thermistor; 485 communication lines are protected not to be damaged when thunderbolt and forceful electric power misconnection.
Described metering module circuit, control module circuit and power module circuitry form three pieces of independently board structure of circuit respectively.
The beneficial effects of the utility model are: adopt said structure, metering module circuit, control module circuit and power module circuitry can make three pieces of independently circuit boards respectively, this modular board structure of circuit is suitable for Installation and Debugging and repair and maintenance, can effectively ensure sampled measurements precision; The utility model control module circuit directly arranges LCD liquid crystal display circuit, and microprocessor is shown by built-in LCD driver module Direct driver LCD device, and not needing increases LCD Liquid Crystal Module, decreases the quantity of device, thus reduces the cost of product.
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 LCD Multi-functional digital display electrical measuring meter;
Fig. 2 is the system principle diagram of the utility model three-phase LCD Multi-functional digital display electrical measuring meter;
Fig. 3 is the circuit theory diagrams of the utility model metering module circuit;
Fig. 4 is the circuit theory diagrams of the utility model control module circuit;
Fig. 5 is the circuit theory diagrams of the utility model power module circuitry;
Fig. 6 is the circuit theory diagrams of the utility model RS485 telecommunication 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 and Fig. 6, the utility model three-phase LCD Multi-functional digital display electrical measuring meter comprises metering module circuit 1, control module circuit 2, power module circuitry 3, one end of described metering module circuit 1 connects electric current input interface, the other end is connected with control module circuit 2, the other end of described control module circuit 2 connects power module circuitry 3, the input end of described power module circuitry 3 is provided with power input and voltage input end, the output terminal of described power module circuitry 3 is also provided with meritorious pulse output interface and communicates with RS485 output interface, wherein:
Described metering module circuit 1, for completing sampling metering, comprises the voltage sampling circuit that current sampling circuit, metering circuit and described power module circuitry 3 export;
Described control module circuit 2 control system is run, and comprises control circuit, clock circuit, data storage circuitry, infrared communication circuit, function button circuit and LCD liquid crystal display circuit;
Described power module circuitry 3 provides power supply for system, comprises power circuit, RS485 telecommunication circuit, impulse output circuit, and outputs to the voltage sampling circuit in described metering module circuit 1.
In the present embodiment, one end of metering module circuit 1 connects electric current input interface Ia+, Ia-, Ib+, Ib-, Ic+, Ic-, the other end is by interface AGND, VDD2, RESET, CS, SCLK, DIN, DOUT, YM_LED2, VAIN, VBIN, VCIN, VN link control module circuit 2, control module circuit 2 other end is by interface GND, VDD1, VCC, TXD485, RXD485, YM_LED1, V2PI, V4PI, V6PI, VN1 connects power module circuitry 3, power module circuitry 3 other end connects power input POW_N, POW_L, 485 communication output interface B, A, meritorious pulse output interface YG-, YG+, voltage input interface Ua, Ub, Uc, Un.
By 3, independently resistance pressure-dividing network, filtering circuit form voltage sampling circuit in described metering module circuit 1, current sampling circuit by 3 independently current transformer, sampling resistor, filtering circuit form, metering circuit is made up of computation chip ATT7022C/PT and peripheral circuit; Described voltage sampling circuit converts voltage signal Ua, Ub, Uc to low-voltage and is input to computation chip, and voltage sampling circuit provides voltage signal for system; Current sampling circuit converts current signal Ia, Ib, Ic to voltage signal and is input to computation chip, and current sampling circuit provides current signal for system; 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 for system.
Input end connecting interface Ua, Ub, Uc, Un of voltage sampling circuit, output terminal connects the voltage sample I/O port of the computation chip ATT7022C/PT of metering circuit.Described voltage sampling circuit connects described control circuit printed circuit board (PCB) by described voltage sampling circuit interface printed circuit board V2PI, V4PI, V6PI, VN1, described control circuit printed circuit board (PCB) connects described metering circuit printed circuit board (PCB) by interface VAIN, VBIN, VCIN, VN, and the output terminal of voltage sampling circuit is connected the voltage sample I/O port of the computation chip ATT7022C/PT of metering circuit by described metering circuit printed circuit board (PCB).
Input end connecting interface Ia, Ib, Ic of current sampling circuit, output terminal connects the current sample I/O port of the computation chip ATT7022C/PT of metering circuit.
Power input connecting interface AGND, VDD2 of metering circuit, SPI communication I/O port connecting interface CS, SCLK, DIN, DOUT of computation chip ATT7022C/PT, the resetting pin of computation chip ATT7022C/PT connects the pulse output I/O port connecting interface YM_LED1 of RESET, computation chip ATT7022C/PT.
Control circuit in described control module circuit 2 is made up of MICROCHIP microprocessor PIC18F86J90 and peripheral circuit, clock circuit is made up of the clock chip RX8025AC with temperature compensation and peripheral circuit, store electricity router chip 24LC04 and peripheral circuit composition, infrared communication circuit is made up of infrared receiving circuit and infrared transmitting circuit, and infrared communication circuit provides UART communication interface, 38kHz modulation interface; Function button circuit is made up of 2 reading buttons, 1 program switch button and peripheral circuit, and LCD liquid crystal display circuit is made up of LCD display part and peripheral circuit, and microprocessor is by built-in LCD driver module Direct driver LCD display part; Described microprocessor completes continuous data process, data display, serial communication, data storage, clock circuit provides system clock data for microprocessor, storage chip is used for supplemental characteristic, the service data of saved system, infrared communication circuit completes data communication and carrier modulation demodulation, the GPIO mouth of function button circuit connection control circuit microprocessor, completes LCD liquid crystal display and turns over screen, program enable switch; The reading button arranged in function button circuit realizes the page turn over operation of LED digital-scroll technique, and programming button realizes the switch of program enable.
The clock chip RX8025AC of clock circuit is connected with SCL, SDA port of the microprocessor PIC18F86J90 of control circuit by SCL, SDA port, the I2C bus that adopts microprocessor reads clock chip and obtains system clock data, when after energising, clock chip continues to walk.
The chip 24LC04 of data storage circuitry is connected with SCL, SDA port of the microprocessor PIC18F86J90 of control circuit by SCL, SDA port, microprocessor adopts the data of I2C bus read-write storage chip, storage chip is used for supplemental characteristic, the service data of saved system, and when being energized after power-off, data are not lost again.
UART mouth, the GPIO mouth of infrared communication circuit and control circuit are connected, and complete data communication and carrier modulation demodulation, and infrared communication can receive and send the infrared communication data of 38kHz modulation.
The GPIO mouth of function button circuit connection control circuit microprocessor.
LCD liquid crystal display circuit is made up of LCD display part and peripheral circuit, and microprocessor is by the direct LCD display part of I/O port, and microprocessor is shown by built-in LCD driver module Direct driver LCD device, decreases the quantity of device.
Microprocessor PIC18F86J90 is the core component of whole control circuit, microprocessor drives port, UART mouth to connect peripheral components by I/O port, I2C bus, spi bus, LCD, completes the functions such as continuous data process, data display, serial communication, data storage.
Power circuit in described power module circuitry 3 is made up of reduction voltage circuit, rectification circuit, filtering circuit, mu balanced circuit, reserve battery and peripheral 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 module circuit, metering module circuit, 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.
Connectivity port, power circuit one end POW_N, POW_L, other end connectivity port connects AGND, VDD2, VCC.
RS485 telecommunication circuit in described power module circuitry 3 is made up of 485 chips, photoelectrical coupler, 485 protection circuits, and impulse output circuit is made up of photoelectrical coupler and peripheral circuit.
Described 485 protection circuits comprise TVS pipe, thermistor; 485 communication lines are protected not to be damaged when thunderbolt and forceful electric power misconnection.
RS485 telecommunication circuit, through photoelectrical coupler, has been connected 485 communications through port TXD485, RXD485 with the UART mouth of the microprocessor of control module, and 485 telecommunication circuit output terminals are through 485 protection circuit connectivity port B, A of TVS pipe, thermistor composition.
Impulse output circuit one end connectivity port YM_LED1, the other end connectivity port YG-, YG+.
Described metering module circuit 1, control module circuit 2 and power module circuitry 3 form three pieces of independently board structure of circuit respectively.
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 LCD Multi-functional digital display electrical measuring meter, it is characterized in that: comprise metering module circuit, control module circuit, power module circuitry, one end of described metering module circuit connects electric current input interface, the other end is connected with control module circuit, the other end of described control module circuit connects power module circuitry, the input end of described power module circuitry is provided with power input and voltage input end, the output terminal of described power module circuitry is also provided with meritorious pulse output interface and communicates with RS485 output interface, wherein:
Described metering module circuit has been used for sampling metering, comprises the voltage employing circuit that current sampling circuit, metering circuit and described power module circuitry export;
Described control module circuit control system runs, and comprises control circuit, clock circuit, data storage circuitry, infrared communication circuit, function button circuit and LCD liquid crystal display circuit;
Described power module circuitry provides power supply for system, comprises power circuit, RS485 telecommunication circuit, impulse output circuit, and outputs to the voltage sampling circuit in described metering module circuit.
2. a kind of three-phase LCD Multi-functional digital display electrical measuring meter according to claim 1, it is characterized in that: by 3, independently resistance pressure-dividing network, filtering circuit form the voltage sampling circuit in described metering module circuit, current sampling circuit by 3 independently current transformer, sampling resistor, filtering circuit form, metering circuit is made up of computation chip ATT7022C/PT and peripheral circuit; Described voltage sampling circuit converts voltage signal Ua, Ub, Uc to low-voltage and is input to computation chip, and voltage sampling circuit provides voltage signal for system; Current sampling circuit converts current signal Ia, Ib, Ic to voltage signal and is input to computation chip, and current sampling circuit provides current signal for system; Metering circuit processes voltage, current signal, exports meritorious, idle pulse signal, for system provides voltage, electric current, power, power factor, electric energy measurement data.
3. a kind of three-phase LCD Multi-functional digital display electrical measuring meter according to claim 1, it is characterized in that: the control circuit in described control module circuit is made up of MICROCHIP microprocessor PIC18F86J90 and peripheral circuit, clock circuit is made up of the clock chip RX8025AC with temperature compensation and peripheral circuit, store electricity router chip 24LC04 and peripheral circuit composition, infrared communication circuit is made up of infrared receiving circuit and infrared transmitting circuit, and infrared communication circuit provides UART communication interface, 38kHz modulation interface; Function button circuit is made up of 2 reading buttons, 1 program switch button and peripheral circuit, and LCD liquid crystal display circuit is made up of LCD display part and peripheral circuit, and microprocessor is by built-in LCD driver module Direct driver LCD display part.
4. a kind of three-phase LCD Multi-functional digital display electrical measuring meter according to claim 1, is characterized in that: the power circuit in described power module circuitry is made up of reduction voltage circuit, rectification circuit, filtering circuit, mu balanced circuit, reserve battery and peripheral circuit; Described power circuit exports the separate power supply of two-way: the first power supply and second source, the first power supply provides power supply to control module circuit, metering module circuit, and second source provides power supply to RS485 telecommunication circuit.
5. a kind of three-phase LCD Multi-functional digital display electrical measuring meter according to claim 4, is characterized in that: described RS485 telecommunication circuit is made up of 485 chips, photoelectrical coupler, 485 protection circuits; Impulse output circuit is made up of photoelectrical coupler and peripheral circuit.
6. a kind of three-phase LCD Multi-functional digital display electrical measuring meter according to claim 5, is characterized in that: described 485 protection circuits comprise TVS pipe, thermistor.
7. a kind of three-phase LCD Multi-functional digital display electrical measuring meter according to claim 1, is characterized in that: described metering module circuit, control module circuit and power module circuitry form three pieces of independently board structure of circuit respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520171547.8U CN204631125U (en) | 2015-03-25 | 2015-03-25 | A kind of three-phase LCD Multi-functional digital display electrical measuring meter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520171547.8U CN204631125U (en) | 2015-03-25 | 2015-03-25 | A kind of three-phase LCD Multi-functional digital display electrical measuring meter |
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| CN204631125U true CN204631125U (en) | 2015-09-09 |
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| CN201520171547.8U Expired - Fee Related CN204631125U (en) | 2015-03-25 | 2015-03-25 | A kind of three-phase LCD Multi-functional digital display electrical measuring meter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109030935A (en) * | 2018-08-10 | 2018-12-18 | 国网湖南省电力有限公司 | A kind of three-phase and four-line intelligent meter of independent measurement neutral line current |
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2015
- 2015-03-25 CN CN201520171547.8U patent/CN204631125U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109030935A (en) * | 2018-08-10 | 2018-12-18 | 国网湖南省电力有限公司 | A kind of three-phase and four-line intelligent meter of independent measurement neutral line current |
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Legal Events
| Date | Code | Title | Description |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150909 Termination date: 20170325 |