CN104502695B - Zero power consumption energy meter read by radio frequency - Google Patents
Zero power consumption energy meter read by radio frequency Download PDFInfo
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- CN104502695B CN104502695B CN201410851206.5A CN201410851206A CN104502695B CN 104502695 B CN104502695 B CN 104502695B CN 201410851206 A CN201410851206 A CN 201410851206A CN 104502695 B CN104502695 B CN 104502695B
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Abstract
The invention discloses a zero power consumption energy meter read by radio frequency. The energy meter comprises a main control circuit, an EEPROM (Electrically Erasable Programmable Read-Only Memory) module circuit and a radio frequency antenna, wherein the main control circuit of the energy meter is regarded as the core part of the energy meter and comprises a microprocessor module, a metering module, a 485 communicating module, a liquid crystal display module, and a relay control module; metering, communicating, displaying and controlling functions are achieved by the main control circuit of the energy meter; a memory is provided to the energy meter by the EEPROM module circuit and a microprocessor communicates with an EEPROM through an I2C bus to achieve the data access function; external RF signals are received by the radio frequency antenna and input to the EEPROM module circuit, and radio frequency signals are converted into read-write commands by the EEPROM which obtains electric energy from an RF system, thus the energy meter can normally operate without depending on the electric energy of an intelligent ammeter. The data in the energy meter can be read by a wireless way when the energy meter is under different environmental conditions such as normal operation, malfunction, damage, normal power supply and power supply failure.
Description
Technical field
The invention belongs to electromagnetic measurement field, be specifically related to a kind of intelligent electric energy meter, particularly relate to the electric energy meter of a kind of zero-power radio frequency meter reading, it can (comprise working properly under electric energy meter is in different conditions, fault, damage, power supply is normal, under power supply inefficacy waits environment) by non-contacting mode reading power meters data.
Background technology
Along with the development of science and technology, the application of various intelligent electric energy meter is popularized, and kilowatt meter reading-out system can by wired or wireless mode by measurement data acquisition, analysis, process.
Such as a kind of remote single-phase charge control intelligent electric energy meter disclosed in No. 201110399711st, Chinese patent application, it comprises microprocessor, electric energy meter metering units, voltage sampling unit, current sampling unit and power circuit; Described voltage sampling unit is connected the signal input part of electric energy meter metering units with the signal output part of current sampling unit; The data output end of electric energy meter metering units connects the data input pin of microprocessor; The output terminal of described microprocessor be connected with LCD display module, Control output interface, second signal output interface, electrical energy pulse output interface; Microprocessor-based control input end is connected with button; Microprocessor is also connected with clock circuit, storer, infrared communication circuit and serial communication circuit; The power input of described power circuit is connected with accumulator, and the power output end of power circuit connects the power input of the power input of electric energy meter metering units, the power input of microprocessor and serial communication circuit respectively.The technical program has independently infrared and RS485 communication interface, supports remote bill control function.
In the electric energy meter system of remote meter reading, data, as the most important information of whole system, are the objects of whole system service.The situations such as in actual use, electric energy meter probably breaks down, damage, cause electric quantity data normally to read, and what bring to power office is huge loss.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides the electric energy meter of a kind of zero-power radio frequency meter reading.Working properly at electric energy meter, the data under the varying environments such as fault, damages, and power supply is normal, power supply inefficacy wirelessly in reading power meters.
According to a first aspect of the present invention, the electric energy meter of a kind of zero-power radio frequency meter reading is provided, it comprises electric energy meter governor circuit, EEPROM module circuit and radio-frequency antenna, electric energy meter governor circuit is the core of electric energy meter, comprise microprocessor module, metering module, 485 communication modules, LCD MODULE, relay control module, electric energy meter governor circuit completes metering, communication, display, controlling functions; EEPROM module circuit provides storer for electric energy meter, and microprocessor is communicated with EEPROM by I2C bus, realizes the access facility of data; Radio-frequency antenna receives external RF signals, and be input to EEPROM module circuit, radiofrequency signal is converted into read write command by EEPROM, and obtains electric energy, so do not rely on the electric energy of intelligent electric energy meter also can normally work from RF system.
According to a second aspect of the present invention, provide the electric energy meter of a kind of zero-power radio frequency meter reading, the electric energy meter of zero-power radio frequency meter reading comprises master controller, electric energy metering module, communication module and memory module; Wherein master controller is the core of electric energy meter, plays the effect of logical operation and control in whole system; Metering module is for gathering current and voltage signals and metering user electricity; Communication module is used for the telecommunication of electric energy meter and host computer; Memory module is used for storing electricity and event data.
Preferably, master controller comprises CPU and minimum system circuit thereof, is composed in series reset circuit by resistance R1 and C1, and the VCC port of resistance R1 mono-termination+5V power supply and CPU, the resistance R1 other end connect the RESET port of electric capacity C1 and CPU; The VSS port of the RESET port of electric capacity C1 mono-terminating resistor R1 and CPU, other end ground connection and CPU.
Preferably, electric energy metering module comprises computation chip U2, crystal oscillating circuit, electric current and voltage sampling circuit, flashlight circuit; MMD1, DVDD, MMD0 port of computation chip all connects metering power supply V_Msr end, and DGND, AGND port all connects metered voltage GND end; The sample rate current of outside live wire actual current is converted into voltage signal (being connected to relay see the I 1+/I 1-end in Fig. 2) after the copper-manganese sheet of relay, sample rate current, after the difference rc filter circuit be made up of resistance R2, R3, R4, R5, electric capacity C2, C3, is input to computation chip current sample port I 1N, I 1P; Hot voltage is input to computation chip voltage sample port VP and holds after R7 electric resistance partial pressure, ground connection after VN end resistance in series R8; Crystal oscillator X2 two ends connect computation chip OSCO, OSCI port, for computation chip provides clock source; The pulse output end CF1 connecting computation chip after resistance R6 and LED1 connects holds, and realizes the display of electric pulse; In difference rc filter circuit, resistance R3 mono-termination I 1+, resistance R3 other end contact resistance R4 and ground end; Resistance R4 mono-termination I 1-, resistance R4 other end contact resistance R3 and ground end; Resistance R2 mono-termination I 1+, the resistance R2 other end connect the I 1N of electric capacity C2 and computation chip; Resistance R5 mono-termination I 1-, the resistance R5 other end connect the I 1P of electric capacity C3 and computation chip; The I 1N of electric capacity C2 mono-terminating resistor R2 and computation chip, another termination capacitor C3 of electric capacity C2 and ground end; The I 1P of electric capacity C3 mono-terminating resistor R5 and computation chip, another termination capacitor C2 of electric capacity C3 and ground end.
Preferably, communication module comprises 485 chip U4 and protection circuits thereof, and the R port of 485 chip U4 connects the RXD port of CPU, RE and the DE port of 485 chip U4 all connects the TXD port of CPU, and the D port of 485 chip U4 connects the P04 port of CPU; The VCC port of electric capacity C4 mono-termination 485 modular power source end and 485 chip U4, another termination 485 modular power source ground end of electric capacity C4; The A port of another termination 485 chip U4 of resistance R10 mono-termination 485 modular power source end and electric capacity C4, resistance R10 and transient voltage suppressor TVS; Another termination 485 bus B port of thermistor F4 mono-termination transient voltage suppressor TVS and resistance R9, thermistor F4; The other end connecting resistance R10 of transient voltage suppressor TVS mono-termination thermistor F4, transient voltage suppressor TVS and 485 bus A ports; The GND port of another termination 485 chip U4 of the B port of resistance R9 mono-termination 485 chip U4 and electric capacity thermistor F4, resistance R9 and 485 modular power sources ground end.
Preferably, memory module comprises eeprom chip U3 and radio-frequency antenna, the SCL port of eeprom chip U3 connects the P60 port of CPU, the SDA port of eeprom chip U3 connects the P61 port of CPU, the VCC port of eeprom chip U3 connects the P122 port of CPU, E1, E0 and VSS port of eeprom chip U3 all connects earth terminal, AC0 with the AC1 port of eeprom chip U3 is connected radio-frequency antenna two ends.
More preferably, add light-coupled isolation at CPU and 485 chip chambers, the stability of system can be increased; Light-coupled isolation chip OP9 inputs a terminating resistor R15, inputs the R port of another termination 485 chip; Light-coupled isolation chip OP9 export terminating resistor R11 and CPU RXD end, export the other end hold; The output of another termination light-coupled isolation chip OP9 of resistance R11 mono-termination cpu power end VCC, resistance R11; The input of another termination light-coupled isolation chip OP9 of resistance R15 mono-termination 485 power end, resistance R15; Light-coupled isolation chip OP10 inputs a termination cpu power end VCC, input other end connecting resistance R12; Light-coupled isolation chip OP10 exports termination 485 power end, exports RE, DE port of other end connecting resistance R16 and 485 chips; The P04 port of the one termination CPU of resistance R12, the input of another termination light-coupled isolation chip OP10; The output of resistance R16 mono-termination light-coupled isolation chip OP10 and RE, DE port of 485 chips, the other end earth terminal of resistance R16; Light-coupled isolation chip OP11 inputs a termination cpu power end VCC, input other end connecting resistance R13; Light-coupled isolation chip OP11 exports the D port of a terminating resistor R14 and 485 chips, the other end earth terminal of light-coupled isolation chip OP11 output; The TXD port of the one termination CPU of resistance R13, the input of another termination light-coupled isolation chip OP11; The output of resistance R14 mono-termination light-coupled isolation chip OP11 and the D port of 485 chips, another termination 485 power end of resistance R14.
According to a third aspect of the present invention, provide the method for work of the electric energy meter of above-mentioned zero-power radio frequency meter reading, it comprises step below:
The first step, electric energy meter adds after 220V voltage powers on starts working, and completes parameter initialization work (power-up initializing);
Second step, judges electric energy meter whether power down, battery-powered after electric energy meter power down, enters power failure data process sub-step, enters low power mode of operation after preserving real time data; If the non-power down of electric energy meter, continue metering electric energy;
3rd step, judges that electric energy meter is the need of access data, and when needing access data, first CPU control I/O pin exports high level, for EEPROM powers on, then completes access data, recording events operation; After electric energy meter receives external RF signals, EEPROM obtains electric being activated, and completes the operation of data access, logout too;
4th step, judges whether to need communication, and when needing communication, CPU, according to long-range 485, infrared or carrier system, selects different UART mouth to communicate respectively;
5th step, electric energy meter completes other programs, comprises liquid crystal display, drives relay, ESAM safety certification, event detection and warning.
Beneficial effect: after using the present invention, electric energy meter is when dead electricity, fault are even damaged, the EEPROM that radio-frequency card reader can be electric energy meter by radiofrequency signal is used to power, and read and write data, read data and the logouts such as the electricity of electric energy meter, for breakdown maintenance provides more information, avoid information about power simultaneously and lose the electricity charge caused and cannot collect, decrease the economic loss of power office.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the electric energy meter according to zero-power radio frequency of the present invention meter reading;
Fig. 2 is the electrical schematic diagram of the electric energy meter of zero-power radio frequency meter reading;
Fig. 3 is the communication module electrical schematic diagram of the electric energy meter of zero-power radio frequency meter reading;
Fig. 4 is the carrier module protection circuit schematic diagram of the electric energy meter of zero-power radio frequency meter reading;
Fig. 5 is that rfid interrogator reads ammeter data process schematic;
Fig. 6 is the software flow pattern of the electric energy meter of zero-power radio frequency meter reading.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only a part of embodiment of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.Additionally, protection scope of the present invention only should be limited to following concrete structure or parts or design parameter.
The electric energy meter of zero-power radio frequency of the present invention meter reading, under specifically referring to that electric energy meter is in different conditions, comprise working properly, fault, damage, power supply is normal, under power supply inefficacy waits environment, can by non-contacting mode reading power meters data.
Apply rfid system in the present invention, namely provide a kind of technology reading passive label, if using the storage unit of passive label as electric energy meter.Just can effectively solve electric energy meter in fault, cannot the problem of sense data in the situations such as damage.The precondition addressed these problems be storage unit not only there is RF interface but also can with instrument communication, stores meter data.RFID (radio-frequency (RF) identification: radio frequency identification) is a kind of contactless automatic identification technology, it automatically identifies destination object by radiofrequency signal and obtains related data, identification work need not manual intervention, as the wireless version of bar code, RFID technique has waterproof not available for bar code, antimagnetic, high temperature resistant, long service life, reading distance are large, on label data can encrypt, store that data capacity is larger, the storage information change advantage such as freely.
In the present invention, the groundwork flow process of rfid system is: read write line sends the radiofrequency signal of certain frequency by inner radio-frequency antenna, when passive label enters the radio-frequency antenna perform region of read write line, utilize wave beam power supply technique, the radiofrequency signal received is converted into direct supply, in passive label, circuit is powered, passive label obtains energy and is activated, the radiofrequency signal of response read write line, by the information in label, utilizes carrier signal to send to read write line by the antenna of passive label.
The M24LR64 used in the present invention is the eeprom memory of a built-in standard I 2C serial ports, can with most of micro-controller communications, in addition, RF (radio frequency) interface of an ISO15693 standard is also provided, radio communication can be carried out with RFID reader.ISO15693 is a kind of passive RFID standard, can obtain electric energy and data from RF system simultaneously.In rf mode, read-write M24LR64 does not need power supply, thus saves on board supply, easily, radio access electronic product parameter easily.I2C (Inter-Integrated Circuit) bus is a kind of twin wire universal serial bus developed by PHILIPS company, for connecting microcontroller and peripherals thereof.I2C has become a kind of comparatively conventional serial interface standard, has that agreement is perfect, supporting chip is more and take the advantages such as I/O port is few.Have at present in a lot of SIC (semiconductor integrated circuit) and be all integrated with I2C interface.Method provided by the invention is by above combine with technique, by non-contacting mode under various circumstances, and reading power meters data.
The electric energy meter technology of zero-power radio frequency of the present invention meter reading is the technology that a kind of field data of guarantee is not to greatest extent lost, and especially when electric energy meter breaks down, initiatively or under the condition of passive uploading data more cannot can play its vital role.Existing read-write technology, all by waking CPU up, reads EEPROM data by CPU by I2C bus, then realizes data transmission by communication modules such as infrared and 485.This programme directly reads the data of EEPROM, can reduce electric energy meter hardware maintenance cost, improves system stability, extends the electric energy meter life-span.
Design proposal of the present invention is: intelligent electric energy meter increases the double nip EEPROM having I2C interface and RF interface on original circuit structure, MCU and the EEPROM of intelligent electric energy meter is connected by I2C interface, and in accordance with the stipulations of I2C communication protocol, data is stored to RF-EEPROM.EEPROM, by the built-in aerial on RF interfacing circuitry plate, can receive the instruction from rfid interrogator, and obtains electric energy from RF system, makes EEPROM not rely on the electric energy of intelligent electric energy meter also can normally work.Rfid interrogator can be connected to host computer by USB interface, and PC control rfid interrogator sends instruction and write or reading data to EEPROM.
Below in conjunction with accompanying drawing, by embodiment, the invention will be further described.
With reference to accompanying drawing 1, specifically provide the structured flowchart of the electric energy meter of zero-power radio frequency meter reading, the electric energy meter of zero-power radio frequency meter reading can be divided into electric energy meter governor circuit, EEPROM module circuit, radio-frequency antenna three part to form.Electric energy meter governor circuit is the core of electric energy meter, and comprise microprocessor module, metering module, 485 communication modules, LCD MODULE, relay control module etc., electric energy meter governor circuit completes the functions such as metering, communication, display, control.EEPROM module circuit provides storer for electric energy meter, and microprocessor is communicated with EEPROM by I2C bus, realizes the access facility of data.Radio-frequency antenna receives external RF signals, and be input to EEPROM module circuit, radiofrequency signal is converted into read write command by EEPROM, and obtains electric energy, so do not rely on the electric energy of intelligent electric energy meter also can normally work from RF system.
With reference to accompanying drawing 2, provide the electrical schematic diagram of the electric energy meter of zero-power radio frequency meter reading further, the electric energy meter of zero-power radio frequency of the present invention meter reading comprises master controller, electric energy metering module, communication module and memory module.Wherein master controller is the core of electric energy meter, plays the effect of logical operation and control in whole system; Metering module is for gathering current and voltage signals and metering user electricity; Communication module is used for the telecommunication of electric energy meter and host computer; Memory module is used for the data such as storing electricity and event.
Master controller comprises CPU and minimum system circuit thereof, is composed in series reset circuit by resistance R1 and C1, and the VCC port of resistance R1 mono-termination+5V power supply and CPU, the resistance R1 other end connect the RESET port of electric capacity C1 and CPU; The VSS port of the RESET port of electric capacity C1 mono-terminating resistor R1 and CPU, other end ground connection and CPU.
Electric energy metering module comprises computation chip U2, crystal oscillating circuit, electric current and voltage sampling circuit, flashlight circuit.MMD1, DVDD, MMD0 port of computation chip all connects metering power supply V_Msr end, and DGND, AGND port all connects metered voltage GND end.The sample rate current of outside live wire actual current is converted into voltage signal (being connected to relay see the I 1+/I 1-end in Fig. 2) after the copper-manganese sheet of relay, sample rate current, after the difference rc filter circuit be made up of resistance R2, R3, R4, R5, electric capacity C2, C3, is input to computation chip current sample port I 1N, I 1P.Hot voltage is input to computation chip voltage sample port VP and holds after R7 electric resistance partial pressure, ground connection after VN end resistance in series R8.Crystal oscillator X2 two ends connect computation chip OSCO, OSCI port, for computation chip provides clock source.The pulse output end CF1 connecting computation chip after resistance R6 and LED1 connects holds, and realizes the display of electric pulse.In difference rc filter circuit, resistance R3 mono-termination I 1+, resistance R3 other end contact resistance R4 and ground end; Resistance R4 mono-termination I 1-, resistance R4 other end contact resistance R3 and ground end; Resistance R2 mono-termination I 1+, the resistance R2 other end connect the I 1N of electric capacity C2 and computation chip; Resistance R5 mono-termination I 1-, the resistance R5 other end connect the I 1P of electric capacity C3 and computation chip; The I 1N of electric capacity C2 mono-terminating resistor R2 and computation chip, another termination capacitor C3 of electric capacity C2 and ground end; The I 1P of electric capacity C3 mono-terminating resistor R5 and computation chip, another termination capacitor C2 of electric capacity C3 and ground end.
Communication module comprises 485 chip U4 and protection circuits thereof, and the R port of 485 chip U4 connects the RXD port of CPU, RE and the DE port of 485 chip U4 all connects the TXD port of CPU, and the D port of 485 chip U4 connects the P04 port of CPU; The VCC port of electric capacity C4 mono-termination 485 modular power source end and 485 chip U4, another termination 485 modular power source ground end of electric capacity C4; The A port of another termination 485 chip U4 of resistance R10 mono-termination 485 modular power source end and electric capacity C4, resistance R10 and transient voltage suppressor TVS; Another termination 485 bus B port of thermistor F4 mono-termination transient voltage suppressor TVS and resistance R9, thermistor F4; The other end connecting resistance R10 of transient voltage suppressor TVS mono-termination thermistor F4, transient voltage suppressor TVS and 485 bus A ports; The GND port of another termination 485 chip U4 of the B port of resistance R9 mono-termination 485 chip U4 and electric capacity thermistor F4, resistance R9 and 485 modular power sources ground end.
Memory module comprises eeprom chip U3 and radio-frequency antenna, the SCL port of eeprom chip U3 connects the P60 port of CPU, the SDA port of eeprom chip U3 connects the P61 port of CPU, the VCC port of eeprom chip U3 connects the P122 port of CPU, E1, E0 and VSS port of eeprom chip U3 all connects earth terminal, AC0 with the AC1 port of eeprom chip U3 is connected radio-frequency antenna two ends.
With reference to accompanying drawing 3, provide another communication module further, it is better than above-mentioned communication module.Add light-coupled isolation at CPU and 485 chip chambers, the stability of system can be increased.Light-coupled isolation chip OP9 inputs a terminating resistor R15, inputs the R port of another termination 485 chip; Light-coupled isolation chip OP9 export terminating resistor R11 and CPU RXD end, export the other end hold; The output of another termination light-coupled isolation chip OP9 of resistance R11 mono-termination cpu power end VCC, resistance R11; The input of another termination light-coupled isolation chip OP9 of resistance R15 mono-termination 485 power end, resistance R15; Light-coupled isolation chip OP10 inputs a termination cpu power end VCC, input other end connecting resistance R12; Light-coupled isolation chip OP10 exports termination 485 power end, exports RE, DE port of other end connecting resistance R16 and 485 chips; The P04 port of the one termination CPU of resistance R12, the input of another termination light-coupled isolation chip OP10; The output of resistance R16 mono-termination light-coupled isolation chip OP10 and RE, DE port of 485 chips, the other end earth terminal of resistance R16; Light-coupled isolation chip OP11 inputs a termination cpu power end VCC, input other end connecting resistance R13; Light-coupled isolation chip OP11 exports the D port of a terminating resistor R14 and 485 chips, the other end earth terminal of light-coupled isolation chip OP11 output; The TXD port of the one termination CPU of resistance R13, the input of another termination light-coupled isolation chip OP11; The output of resistance R14 mono-termination light-coupled isolation chip OP11 and the D port of 485 chips, another termination 485 power end of resistance R14; VCC, B, A, GND port of 485 chips is connected same Fig. 2 with the circuit between 485 bus ports.
With reference to accompanying drawing 4, provide carrier module protection circuit further, it is for the electrical isolation between carrier module and CPU digital output pin.The collector of the base stage connecting resistance R20 of triode Q1 and resistance R21, triode Q1 connects the reset terminal ZBRESET of carrier module, the emitter connecting resistance R21 of triode Q1 and ground end; The I/O mouth RESERZB port of resistance R20 mono-termination CPU, the other end connecting resistance R21 of resistance R20 and the base stage of triode Q1; The emitter of the base stage of resistance R21 mono-terminating resistor R20 and triode Q1, another termination triode Q1 of resistance R21 and ground end; The collector of the base stage connecting resistance R22 of triode Q2 and resistance R23, triode Q2 connects the time output terminal ZBEVENOUT of carrier module, the emitter connecting resistance R23 of triode Q2 and ground end; The I/O mouth EVENOUT port of resistance R22 mono-termination CPU, the other end connecting resistance R23 of resistance R22 and the base stage of triode Q2; The emitter of the base stage of resistance R23 mono-terminating resistor R22 and triode Q2, another termination triode Q2 of resistance R23 and ground end; The emitter of the base stage connecting resistance R24 of triode Q3 and resistance R25, triode Q3 meets the collector connecting resistance R26 of power end and resistance R24, triode Q3; The base stage of the emitter of resistance R24 mono-termination power end and triode Q3, the other end connecting resistance R25 of resistance R24 and triode Q3; The TXD_Z port of the base stage of resistance R25 mono-terminating resistor R24 and triode Q3, another termination CPU of resistance R25; The collector of the base stage connecting resistance R26 of triode Q4 and resistance R27, triode Q4 connects the transmitting terminal ZBTXD of carrier module, the emitter connecting resistance R27 of triode Q4 and ground end; The collector of resistance R26 mono-termination triode Q3, the other end connecting resistance R27 of resistance R26 and the base stage of triode Q4; The emitter of another termination triode Q4 of the one terminating resistor R26 of resistance R27 and the base stage of triode Q4, resistance R27 and ground end.
With reference to accompanying drawing 5, the data procedures providing RF-EEPROM in RF read write line reading intelligent electric energy meter is further as follows: master controller is PC, and rfid interrogator by USB interface and PC communication, and applies RF transceiver transmitting-receiving RF signal.Electric energy meter receives RF signal by built-in aerial on circuit board, and EEPROM is activated after receiving RF signal, and the work of response read write line also completes the access of data.
With reference to accompanying drawing 6, provide the workflow diagram of the electric energy meter of zero-power radio frequency meter reading further.
Step describes:
The first step, electric energy meter adds after 220V voltage powers on starts working, and completes parameter initialization work (power-up initializing).
Second step, judges electric energy meter whether power down, battery-powered after electric energy meter power down, enters power failure data process sub-step, enters low power mode of operation after preserving real time data.If the non-power down of electric energy meter, continue metering electric energy.
3rd step, judges that electric energy meter is the need of access data, and when needing access data, first CPU control I/O pin exports high level, for EEPROM powers on, then completes access data, recording events operation.After electric energy meter receives external RF signals, EEPROM obtains electric being activated, and completes the operation of data access, logout too.
4th step, judges whether to need communication, and when needing communication, CPU, according to long-range 485, infrared or carrier system, selects different UART mouth to communicate respectively.
5th step, electric energy meter completes other programs, comprises liquid crystal display, drives relay, ESAM safety certification, event detection and warning etc.
6th step, terminates.
The above; be only the present invention's preferably embodiment, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.This area those skilled in the art are appreciated that when not deviating from the spirit and scope of the present invention of claims definition, can make various amendment in form and details.
Claims (6)
1. an electric energy meter for zero-power radio frequency meter reading, it comprises electric energy meter governor circuit, EEPROM module circuit and radio-frequency antenna, wherein
Electric energy meter governor circuit is the core of electric energy meter, and comprise microprocessor module, metering module, 485 communication modules, LCD MODULE, relay control module, electric energy meter governor circuit completes metering, communication, display, controlling functions; EEPROM module circuit provides storer for electric energy meter, and microprocessor is communicated with EEPROM by I2C bus, realizes the access facility of data; Radio-frequency antenna receives external RF signals, and be input to EEPROM module circuit, radiofrequency signal is converted into read write command by EEPROM, and obtains electric energy, so do not rely on the electric energy of intelligent electric energy meter also can normally work from RF system.
2. an electric energy meter for zero-power radio frequency meter reading, is characterized in that, the electric energy meter of zero-power radio frequency meter reading comprises master controller, electric energy metering module, communication module and memory module; Wherein master controller is the core of electric energy meter, plays the effect of logical operation and control in whole system; Metering module is for gathering current and voltage signals and metering user electricity; Communication module is used for the telecommunication of electric energy meter and host computer; Memory module is used for storing electricity and event data;
Wherein, master controller comprises CPU and minimum system circuit thereof, is composed in series reset circuit by resistance R1 and C1, and the VCC port of resistance R1 mono-termination+5V power supply and CPU, the resistance R1 other end connect the RESET port of electric capacity C1 and CPU; The VSS port of the RESET port of electric capacity C1 mono-terminating resistor R1 and CPU, other end ground connection and CPU;
Memory module comprises eeprom chip U3 and radio-frequency antenna, the SCL port of eeprom chip U3 connects the P60 port of CPU, the SDA port of eeprom chip U3 connects the P61 port of CPU, the VCC port of eeprom chip U3 connects the P122 port of CPU, E1, E0 and VSS port of eeprom chip U3 all connects earth terminal, AC0 with the AC1 port of eeprom chip U3 is connected radio-frequency antenna two ends.
3. according to the electric energy meter of zero-power radio frequency according to claim 2 meter reading, it is characterized in that, electric energy metering module comprises computation chip U2, crystal oscillating circuit, electric current and voltage sampling circuit, flashlight circuit; MMD1, DVDD, MMD0 port of computation chip all connects metering power supply V_Msr end, and DGND, AGND port all connects metered voltage GND end; The sample rate current of outside live wire actual current is converted into voltage signal (being connected to relay see the I 1+/I 1-end in Fig. 2) after the copper-manganese sheet of relay, sample rate current, after the difference rc filter circuit be made up of resistance R2, R3, R4, R5, electric capacity C2, C3, is input to computation chip current sample port I 1N, I 1P; Hot voltage is input to computation chip voltage sample port VP and holds after R7 electric resistance partial pressure, ground connection after VN end resistance in series R8; Crystal oscillator X2 two ends connect computation chip OSCO, OSCI port, for computation chip provides clock source; The pulse output end CF1 connecting computation chip after resistance R6 and LED1 connects holds, and realizes the display of electric pulse; In difference rc filter circuit, resistance R3 mono-termination I 1+, resistance R3 other end contact resistance R4 and ground end; Resistance R4 mono-termination I 1-, resistance R4 other end contact resistance R3 and ground end; Resistance R2 mono-termination I 1+, the resistance R2 other end connect the I 1N of electric capacity C2 and computation chip; Resistance R5 mono-termination I 1-, the resistance R5 other end connect the I 1P of electric capacity C3 and computation chip; The I 1N of electric capacity C2 mono-terminating resistor R2 and computation chip, another termination capacitor C3 of electric capacity C2 and ground end; The I 1P of electric capacity C3 mono-terminating resistor R5 and computation chip, another termination capacitor C2 of electric capacity C3 and ground end.
4. according to zero-power radio frequency according to claim 2 meter reading, it is characterized in that, communication module comprises 485 chip U4 and protection circuits thereof, the R port of 485 chip U4 connects the RXD port of CPU, RE and the DE port of 485 chip U4 all connects the TXD port of CPU, and the D port of 485 chip U4 connects the P04 port of CPU; The VCC port of electric capacity C4 mono-termination 485 modular power source end and 485 chip U4, another termination 485 modular power source ground end of electric capacity C4; The A port of another termination 485 chip U4 of resistance R10 mono-termination 485 modular power source end and electric capacity C4, resistance R10 and transient voltage suppressor TVS; Another termination 485 bus B port of thermistor F4 mono-termination transient voltage suppressor TVS and resistance R9, thermistor F4; The other end connecting resistance R10 of transient voltage suppressor TVS mono-termination thermistor F4, transient voltage suppressor TVS and 485 bus A ports; The GND port of another termination 485 chip U4 of the B port of resistance R9 mono-termination 485 chip U4 and electric capacity thermistor F4, resistance R9 and 485 modular power sources ground end.
5. according to the electric energy meter of zero-power radio frequency according to claim 2 meter reading, it is characterized in that, add light-coupled isolation at CPU and 485 chip chambers, the stability of system can be increased; Light-coupled isolation chip OP9 inputs a terminating resistor R15, inputs the R port of another termination 485 chip; Light-coupled isolation chip OP9 export terminating resistor R11 and CPU RXD end, export the other end hold; The output of another termination light-coupled isolation chip OP9 of resistance R11 mono-termination cpu power end VCC, resistance R11; The input of another termination light-coupled isolation chip OP9 of resistance R15 mono-termination 485 power end, resistance R15; Light-coupled isolation chip OP10 inputs a termination cpu power end VCC, input other end connecting resistance R12; Light-coupled isolation chip OP10 exports termination 485 power end, exports RE, DE port of other end connecting resistance R16 and 485 chips; The P04 port of the one termination CPU of resistance R12, the input of another termination light-coupled isolation chip OP10; The output of resistance R16 mono-termination light-coupled isolation chip OP10 and RE, DE port of 485 chips, the other end earth terminal of resistance R16; Light-coupled isolation chip OP11 inputs a termination cpu power end VCC, input other end connecting resistance R13; Light-coupled isolation chip OP11 exports the D port of a terminating resistor R14 and 485 chips, the other end earth terminal of light-coupled isolation chip OP11 output; The TXD port of the one termination CPU of resistance R13, the input of another termination light-coupled isolation chip OP11; The output of resistance R14 mono-termination light-coupled isolation chip OP11 and the D port of 485 chips, another termination 485 power end of resistance R14.
6. the method for work of the electric energy meter of above-mentioned zero-power radio frequency meter reading, it comprises step below:
The first step, electric energy meter adds after 220V voltage powers on starts working, and completes parameter initialization work (power-up initializing);
Second step, judges electric energy meter whether power down, battery-powered after electric energy meter power down, enters power failure data process sub-step, enters low power mode of operation after preserving real time data; If the non-power down of electric energy meter, continue metering electric energy;
3rd step, judges that electric energy meter is the need of access data, and when needing access data, first CPU control I/O pin exports high level, for EEPROM powers on, then completes access data, recording events operation; After electric energy meter receives external RF signals, EEPROM obtains electric being activated, and completes the operation of data access, logout too;
4th step, judges whether to need communication, and when needing communication, CPU, according to long-range 485, infrared or carrier system, selects different UART mouth to communicate respectively;
5th step, electric energy meter completes other programs, comprises liquid crystal display, drives relay, ESAM safety certification, event detection and warning.
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| CN105467205A (en) * | 2015-05-23 | 2016-04-06 | 李银龙 | Electric energy meter with zero-power RF meter reading |
| CN108717173B (en) * | 2018-05-15 | 2020-12-18 | 黑龙江省电工仪器仪表工程技术研究中心有限公司 | Intelligent electric energy meter data tracing method |
| CN110118897A (en) * | 2019-06-20 | 2019-08-13 | 南方电网科学研究院有限责任公司 | A kind of electric energy meter on-load switch contact resistance detection device |
| CN110517472B (en) * | 2019-09-18 | 2024-03-22 | 湖南农业大学 | Power consumption optimization system based on electric power Internet of things |
| CN112837525A (en) * | 2021-01-20 | 2021-05-25 | 蘑菇物联技术（深圳）有限公司 | RS485 instrument configuration and communication method, system, terminal and storage medium |
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