CN114545076B - Single-phase guide rail type intelligent electric energy meter supporting index management - Google Patents
Single-phase guide rail type intelligent electric energy meter supporting index management Download PDFInfo
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- CN114545076B CN114545076B CN202210190211.0A CN202210190211A CN114545076B CN 114545076 B CN114545076 B CN 114545076B CN 202210190211 A CN202210190211 A CN 202210190211A CN 114545076 B CN114545076 B CN 114545076B
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- 238000004891 communication Methods 0.000 claims abstract description 54
- 238000005259 measurement Methods 0.000 claims abstract description 21
- 230000005540 biological transmission Effects 0.000 claims abstract description 3
- 239000003990 capacitor Substances 0.000 claims description 54
- 238000004804 winding Methods 0.000 claims description 23
- 238000006243 chemical reaction Methods 0.000 claims description 18
- 230000003287 optical effect Effects 0.000 claims description 18
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 8
- 229910052710 silicon Inorganic materials 0.000 claims description 8
- 239000010703 silicon Substances 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 7
- 230000000087 stabilizing effect Effects 0.000 claims description 7
- 102100028680 Protein patched homolog 1 Human genes 0.000 claims description 3
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- 238000012545 processing Methods 0.000 abstract description 4
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- 230000005611 electricity Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 9
- 238000005265 energy consumption Methods 0.000 description 5
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
- G01R22/10—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods using digital techniques
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02B90/20—Smart grids as enabling technology in buildings sector
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Abstract
The invention provides a single-phase guide rail type intelligent electric energy meter supporting index management, which comprises: the power supply circuit, the power measurement module, the SOC chip circuit, the communication circuit and the LCD control unit are connected with the output end of the power supply circuit, the communication circuit and the LCD control unit, and are used for supplying power to the modules; the power measurement module inputs commercial power and the output end of the power measurement module is connected with the SOC chip circuit; the utility model provides a system and a method for measuring electric power of a user side commercial power, the electric power measuring module is used for measuring the electric signal of the user side commercial power, the electric signal is uploaded to an SOC chip circuit for processing and electric energy metering, the output end of the SOC chip circuit is connected with a storage unit, data are stored in the storage chip, the SOC chip circuit is connected with an LCD control unit, the LCD control unit is driven to realize basic information display, the SOC chip circuit is also connected with a communication unit to realize data transmission, the remote ammeter reading is realized by adopting the system and the method, the manpower consumption of manual ammeter reading is reduced, and a user can freely select intelligent experience of controlling the electric power consumption, so that conscious energy saving and electricity saving are achieved.
Description
Technical Field
The invention relates to the field of intelligent electric meters, in particular to a single-phase guide rail type intelligent electric energy meter supporting index management.
Background
The electric energy meter is called an electric meter for measuring electric energy, and the traditional electric meter adopts a manual meter reading mode, so that the manual consumption is high, hysteresis exists in data, and a user cannot monitor and manage and acquire real-time electric quantity.
Summary of the invention
The invention provides a single-phase guide rail type intelligent electric energy meter supporting index management, which can realize the functions of metering electric energy of a user and remote ammeter reading, and has the specific technical scheme that: comprising the following steps: the power supply circuit, the power measurement module, the SOC chip circuit, the communication circuit and the LCD control unit, wherein the output end of the power supply circuit is connected with the SOC chip circuit, the communication circuit and the LCD control unit and is used for supplying power to each module; the power measurement module inputs commercial power and the output end of the power measurement module is connected with the SOC chip circuit; the SOC chip circuit is used for measuring electric energy, the output end of the SOC chip circuit is connected with the LCD control unit and the storage unit, and the SOC chip circuit is also connected with the communication unit to realize data transmission.
Further, the power supply circuit adopts an alternating current-direct current conversion switch power supply circuit, the input end of the power supply circuit is connected with the mains supply, and the power supply circuit comprises: the power conversion chip U5, the transformer TR1 and the voltage stabilizing chip U6, wherein the power conversion chip U5 adopts PN8175, an S pin of the power conversion chip U5 is grounded and is connected with an output end emitter of the optocoupler OP6, an EN/UV pin is connected with an output end collector of the optocoupler OP6, and a D pin is connected with a 3 end of a primary winding end of the transformer TR 1; the 4 end of the primary winding end of the transformer TR1 is input with the commercial power signal processed by the rectifying and filtering circuit, the 1 end of the primary winding end of the transformer TR1 is grounded, the 2 end of the primary winding end of the transformer TR1 is connected with the anode of the diode D3, the cathode of the diode D3 is connected with 3.6v voltage, the anode of the capacitor E3 and the inductor RS0, the cathode of the capacitor E3 is grounded, the other end of the capacitor E3 is connected with the capacitor C7, the other end of the inductor RS0 is connected with the Vin pin of the voltage stabilizing chip U6, and the Vo pin of the voltage stabilizing chip U6 outputs 3.3v voltage; the secondary winding end 6 end of the transformer TR1 outputs a voltage G485, the end 5 is connected with a diode rectifying circuit, the output end of the rectifying circuit is connected with a resistor R12, the anode of a capacitor E5 and an inductor RS1, the voltage V485 is output, the cathode of the capacitor E5 outputs the voltage G485, and a capacitor C9 is connected between the cathode of the capacitor E5 and the inductor RS 1; the other end of the resistor R12 is connected with the positive electrode of the input end of the optocoupler OP6, the resistor R13 is connected between the positive electrode and the negative electrode of the input end of the optocoupler OP6, the negative electrode of the input end of the optocoupler OP6 is connected with the K electrode of the silicon controlled rectifier Q1 and one end of the resistor R26, the A electrode of the silicon controlled rectifier Q1 is connected with the voltage G485, the R electrode is connected with the resistor R29, the resistor R36 and the resistor R37, the other end of the resistor R29 is connected with the voltage V485, the resistors R36 and R37 are connected in parallel, and the other ends of the resistors R36 and R37 are connected with the voltage G485.
Further, the rectifying and filtering circuit connected to the 4-terminal of the primary winding terminal of the transformer TR1 includes: the positive electrode of the diode D1 is connected with the positive electrode of the capacitor E1, the negative electrode of the capacitor E1 is grounded, and the fuse PTC1 is connected to the line L of the mains supply.
Furthermore, a protection circuit is further connected between the D pin of the power conversion chip U5 and the 4 end of the primary winding end of the transformer TR1, the protection circuit includes a diode D2, a capacitor C5, and resistors R11 and R16 connected in series, the anode of the diode D2 is connected to the D pin of the power conversion chip U5, the cathode is connected to one end of the capacitor C5 and the resistor R11, and the other end of the capacitor C5 is connected to the other end of the resistor R16 and the 4 end of the primary winding end of the transformer TR 1.
Furthermore, a chip U1 of the SOC chip circuit adopts a G80F923 chip, a VDD pin of the chip U1 inputs 3.3v working voltage, I1N, I P, VN and VP pins are connected with the power measurement module, RX and TX pins are connected with the communication unit, the chip U1 drives the LCD control unit through SEG and COM pins, the chip U1 is also connected with the memory chip U2 through SCL and SDA pins, and the chip U1 is also connected with the metering pulse circuit through PF pins.
Further, the power measurement module includes: an inductor RS2 positioned on a mains supply N line, a resistor string formed by connecting a plurality of resistors in series, and an RC filter circuit, wherein one end of the resistor string is connected with the inductor in series, the other end of the resistor string is connected with the RC filter circuit and a VP pin, and the other end of the RC filter circuit is grounded; the resistor R8 is connected with the capacitor C4 in parallel, one end of the resistor R is grounded, and the other end of the resistor R is connected with the VN pin; the commercial power I-line is connected with an I1P pin after being filtered by a resistor R9 and a capacitor C1; the commercial power I+ line is connected with an I1N pin after passing through a resistor R10 and a capacitor C2.
Further, the communication unit includes: 485 communication unit, GPRS communication unit, 485 communication unit is connected with RXD1, TXD1 pin of chip U1; the GPRS communication unit is connected with RXD0 and TXD0 pins of the chip U1.
Still further, the 485 communication unit includes: the optocouplers OP2, OP3 and 485 communication chip U4, the 485 communication chip U4 adopts HYM3085, and the VCC pin is connected with voltage V485;
the positive electrode of the input end of the optical coupler OP2 is connected with a voltage V485, the negative electrode of the input end of the optical coupler OP2 is connected with an RO pin of a 485 communication chip U4, the collector electrode of the output end of the optical coupler OP2 is connected with a voltage of 3.3V through a resistor R30, and the collector electrode of the output end of the optical coupler OP2 is connected with an RXD1 pin of a chip U1 and the emitter electrode of the output end of the optical coupler OP2 is grounded; the positive electrode of the input end of the optical coupler OP3 is connected with 3.3V voltage through a pull-up resistor R31, the negative electrode of the input end is connected with the TXD1 pin of the chip U1, the collector electrode of the output end is connected with the voltage V485, and the emitter electrode of the output end is connected with the DI pin of the communication chip U4; the resistor R34 is connected between the A pin and the VCC pin of the 485 communication chip U4, the B pin of the 485 communication chip U4 is grounded, and the TVS tube is connected between the A, B pins.
Still further, the GPRS communication unit comprises: the positive electrode of the input end of the 6-pin optocoupler OP4 and the 6-pin optocoupler OP5 of the optocoupler OP4 is connected with 3.3V voltage through a resistor R27, the negative electrode of the input end of the optocoupler OP4 is connected with a TXD0 pin signal of the chip U1, the 6-pin voltage V485 of the output end of the optocoupler OP4 and the 5-pin output W-RXD signal are grounded; the positive pole of the input end of the optical coupler OP5 is connected with a voltage V485 through a resistor R45, the negative pole is input with a W-RXD signal, the 6 pin of the output end is connected with a 3.3V voltage, and the 5 pin outputs the signal to the RXD0 pin and the 4 pin of the chip U1 to be grounded.
Further, the memory chip U2 adopts a 24C256 chip, where the VCC pin is connected to a 3.3v voltage, the SCL pin is connected to the pull-up resistor R24 and the SCL pin of the chip U1, and the SDA pin is connected to the pull-up resistor R25 and the SDA pin of the chip U1.
Further, the metering pulse circuit includes: the anode of the pulse lamp D7 is connected with 3.3v voltage through a resistor R23, the cathode is connected with the PF pin of the chip U1 and a resistor R38, the other end of the resistor R38 is connected with the cathode of the input end of the optocoupler OP1, the anode of the input end of the optocoupler OP1 is connected with 3.3v voltage, and the output end of the optocoupler OP1 outputs pulse metering signals.
Compared with the prior art, the invention has the following beneficial effects: by adopting the power supply circuit, the power supply to each module is realized through the power supply circuit, the electric signal of the commercial power of the user side is measured by the electric power measurement module, the electric signal is uploaded to the SOC chip circuit for processing and electric energy metering, the data can be stored in the storage chip, the SOC chip circuit drives the LCD control unit to realize the display of basic information, the verification is realized through the metering pulse circuit, meanwhile, the data is remotely read through the communication unit, the intelligent experience of remote ammeter reading and free selection control of the electric consumption is realized, and the manpower consumption of manual ammeter reading is reduced.
Drawings
FIG. 1 is a schematic diagram of the framework of the present patent;
FIG. 2 is a circuit diagram of the power circuit module of the present patent;
FIG. 3 is a schematic circuit diagram of the present patent with respect to a power measurement module;
FIG. 4 is a schematic diagram of an SOC chip circuit;
fig. 5 is a circuit diagram of a 485 communication unit;
fig. 6 is a schematic circuit diagram of a GPRS communication unit
FIG. 7 is a schematic circuit diagram of an LCD control unit;
FIG. 8 is a schematic circuit diagram of a memory chip;
fig. 9 is a schematic diagram of a metering pulse circuit.
Detailed Description
The invention will now be further described with reference to the accompanying drawings.
As shown in fig. 1, the present patent includes: comprising the following steps: the power supply circuit, the power measurement module, the SOC chip circuit, the communication circuit, the LCD control unit and the key are connected with the output end of the power supply circuit, the communication circuit and the LCD control unit, and the power supply circuit is used for supplying power to each functional module; the power measurement module inputs commercial power which is the commercial power input of the user side, and the output end of the power measurement module is connected with the SOC chip circuit and is used for sampling the electric signal of the commercial power of the user side in real time and feeding back to the SOC chip circuit; the SOC chip circuit realizes operation starting, resetting and zero clearing through keys, receives data fed back by the power measurement module and performs signal conversion and electric energy measurement; the output end of the SOC chip circuit is connected with the LCD control unit, and the LCD display screen is used for displaying the information such as the electricity consumption, the residual quantity and the like; the output end of the SOC chip circuit is connected with the storage unit, and history data can be stored in the storage unit; the SOC chip circuit is also connected with the communication unit to realize remote ammeter reading.
As shown in fig. 2, the power supply circuit adopts an ac/dc conversion switch power supply circuit, the input end of the power supply circuit is connected with the mains supply of the user terminal, and the power supply circuit comprises: rectifying and filtering circuit, power conversion chip U5, transformer TR1, steady voltage chip U6 are connected with fuse PTC1 on the commercial power L line, and the commercial power is input to transformer TR1 primary end after rectifying and filtering circuit handles, and rectifying and filtering circuit includes: the diode D1, the diode D6 and the capacitor E1 are connected in series, the anode of the diode D1 is connected with the mains supply L line, the cathode of the diode D6 is connected with the anode of the capacitor E1 and the 4 end of the primary winding end of the transformer TR1, and the cathode of the capacitor E1 is grounded.
The power conversion chip U5 adopts PN8175, the S pin of the power conversion chip U5 is grounded and is connected with the output end emitter of the optocoupler OP6, the EN/UV pin is connected with the output end collector of the optocoupler OP6, the D pin is connected with the 3 end of the primary winding end of the transformer TR1 and the anode of the diode D2, the cathode of the diode D2 is connected with the resistors R11 and R16 which are connected in series, the resistors R11 and R16 are connected in parallel with the capacitor C5 after being connected in series, and the diode D2, the resistors R11 and R16 and the capacitor C5 form a protection circuit which is arranged between the D pin of the power conversion chip U5 and the 4 end of the primary winding end of the transformer TR 1.
The utility model discloses a voltage stabilizing circuit, including transformer TR 1's primary winding end 4 end input through rectifier filter circuit processing's commercial power, transformer TR 1's primary winding end 1 ground connection, 2 termination diode D3's positive electrode, diode D3's negative electrode connects 3.6v voltage, electric capacity E3 positive electrode and inductance RS0, electric capacity E3's negative electrode ground connection, and connect electric capacity C7 with RS 0's the other end, electric capacity RS 0's the Vin pin of termination steady voltage chip U6, steady voltage chip U6's Vo pin connects electric capacity C8 and electric capacity E4 positive electrode to output 3.3v voltage, electric capacity C8's the other end and electric capacity E4's negative electrode are connected and ground connection, steady voltage chip U6 adopts HT7533 steady voltage chip, can step down 3.6v voltage steady voltage output 3.3v voltage.
The secondary winding end 6 of the transformer TR1 outputs voltages G485 and 5 ends of the voltage G485 are connected with a diode rectifying circuit, the rectifying circuit comprises two diodes D5 and D6 which are connected in parallel, anodes of the diodes D5 and D6 are connected with the secondary winding end 6 of the transformer TR1, cathodes of the diodes D5 and D6 are connected with one end of a resistor R12, the positive electrode of a capacitor E5 and one end of an inductor RS1, the other end of the inductor RS1 is connected with a capacitor C9, the output voltage V485 is output, and the negative electrode of the capacitor E5 and the capacitor C9 are connected with the output voltage G485;
one end of a resistor R12 is also input with 5v voltage, the other end of the resistor R12 is connected with the positive electrode of the input end of an optocoupler OP6, a resistor R13 is connected between the positive electrode and the negative electrode of the input end of the optocoupler OP6, the negative electrode of the input end of the optocoupler OP6 is connected with the K electrode of a silicon controlled rectifier Q1, and the A electrode of the silicon controlled rectifier Q1 is connected with a voltage G485; the negative electrode of the input end of the optical coupler OP6 is also connected with one end of a resistor R26, two ends of the resistor R26 are respectively connected with one ends of a capacitor C10 and a capacitor C11, and the other end of the capacitor C10 and one end of the capacitor C11 are connected with the R electrode of the silicon controlled rectifier Q1; the R pole of the controlled silicon Q1 is also connected with one end of a resistor R29, a resistor R36 and a resistor R37, the other end of the resistor R29 is connected with a voltage V485, the resistors R36 and R37 are connected in parallel, and the other ends of the resistors R36 and R37 are connected with a voltage G485.
The power supply circuit is adopted to convert the alternating current commercial power of the user side into 3.3V voltage and voltage V485 so as to meet the power supply requirements of a plurality of modules.
As shown in fig. 3, the power measurement module includes: the resistor string comprises resistors R1, R2, R3, R4, R5, R6, R14, R15, R17, R18 and R19 which are sequentially connected in series, wherein the resistor R1 is connected with the inductor RS2, the other end of the resistor R19 is connected with the RC filter circuit and the SOC chip circuit, the RC filter circuit comprises a resistor R7 and a capacitor C3, and the resistor R7 and the capacitor C3 are connected in parallel; the resistor R8 is connected with the capacitor C4 in parallel, one end of the resistor R is grounded, and the other end of the resistor R is connected with the SOC chip circuit; the commercial power I-line is connected with an SOC chip circuit after being filtered by a resistor R9 and a capacitor C1; the commercial power I+ line is connected with the SOC chip circuit after passing through the resistor R10 and the capacitor C2, and the circuit is used for sampling the current or voltage signal of the commercial power at the user side and feeding back to the SOC chip circuit.
In fig. 4, a chip U1 of the SOC chip circuit adopts a G80F923 chip embedded with an 8051 core, a VDD pin of the chip U1 inputs a 3.3v working voltage filtered by a C12, AGND pins and DGND pins are grounded, an AVCC pin is grounded after passing through a capacitor C15, a VOUT pin output signal is filtered by a capacitor C27, and the VOUT pin is connected with a resistor R21 and a capacitor C13 in series, and the other end of the capacitor is grounded; and a crystal oscillator X1 is connected between the XTAL2 and the XTAL 1; the RESET pin is connected with the other end of the resistor R21, and the chip U1 is RESET when the RESET pin is kept at a low level; the external voltage 3.6v is divided by resistors R20 and R22 which are connected in series in sequence, the other end of the resistor R22 is grounded, the resistor R22 is connected with a capacitor C19 in parallel, and the pin P2.3 of the chip U1 is connected with the potential voltage at the joint point of the resistors R20 and R22.
The chip U1 is also connected with other functional modules: I1N, I P, VN and VP pins are connected with the power measurement module, RX and TX pins are connected with the communication unit, the chip U1 drives the LCD control unit shown in FIG. 7 through SEG and COM pins, the chip U1 is also connected with the memory chip U2 through SCL and SDA pins, and the chip U1 is also connected with the metering pulse circuit through PF pins.
The electric energy meter can be connected with electric quantity control equipment through a communication unit, and an energy consumption index early warning value of each month are set in the electric quantity control equipment;
the communication unit can adopt 485 communication units and GPRS communication units, remote ammeter reading can be realized by adopting 485 communication or GPRS communication, energy consumption indexes can be monitored in time, when the energy consumption reaches an early warning value set by the indexes, for example, the energy consumption reaches 80% of the indexes, and the electric energy meter can send out relevant reminding; when the energy consumption exceeds the index set value, the electric quantity charging of the exceeding part can be automatically counted according to the set electric quantity data, and the index metering is automatically restarted at the beginning of each month and month, so that the method is suitable for places needing index management, such as schools.
As shown in fig. 5, the 485 communication unit includes: the optocouplers OP2, OP3 and 485 communication chips U4 and the 485 communication chip U4 adopt HYM3085, the VCC pin of the optocoupler OP2, OP3 and 485 communication chip U4 is grounded through a voltage V485 pin and an SGND pin, the A pin and the B pin of the 485 communication chip U4 are differential signal ends for receiving and transmitting respectively, a TVS tube is connected between A, B pins, and a resistor R34 is connected between the A pin and the VCC pin and the B pin is grounded through a resistor R35; the RO pin DI pin of the 485 communication chip U4 is respectively the output of the receiver and the input end of the driver, wherein the RO pin is connected with the negative electrode of the input end of the optical coupler OP2, the positive electrode of the input end of the optical coupler OP2 is connected with the voltage V485 after passing through the resistor R32, the collector of the output end of the optical coupler OP2 is connected with the voltage of 3.3V through the resistor R30, the collector of the output end is connected with the RXD1 pin of the chip U1, and the emitter of the output end is grounded; the DI pin is connected with one end of a resistor R33, the other end of the resistor R33 is connected with an emitter of an output end of an optocoupler OP3, a collector of the output end of the optocoupler OP3 is connected with a voltage V485, an anode of an input end of the optocoupler OP3 is connected with 3.3V voltage through a pull-up resistor R31, and a cathode of the input end of the optocoupler OP3 is connected with a TXD1 pin of a chip U1; the RE pin and the DE pin are respectively the enabling ends for receiving and transmitting and are respectively connected with the other end of the resistor R33.
As shown in fig. 6, the GPRS communication unit includes: the positive electrode of the input end of the 6-pin optocoupler OP4 and the 6-pin optocoupler OP5 of the optocoupler OP4 is connected with 3.3V voltage through a resistor R27, the negative electrode of the input end of the optocoupler OP4 is connected with a TXD0 pin signal of a chip U1, a resistor R44 is connected between the 6-pin voltage V485 and the 5-pin of the output end of the optocoupler OP4 and the 6-pin, and the 5-pin outputs a W-RXD signal and a 4-pin voltage G485; the positive pole of the input end of the optical coupler OP5 is connected with a voltage V485 through a resistor R45, the negative pole is input with a W-RXD signal, the 6 pin of the output end is connected with a 3.3V voltage, and a resistor R28 and a 5 pin are connected between the 6 pin and the 5 pin to output signals to RXD0 pin and 4 pin of the chip U1 to be grounded.
As shown in fig. 8, the memory chip U2 adopts a 24C256 chip, the VCC pin is connected to a 3.3v voltage, the SCL pin is connected to the pull-up resistor R24 and the SCL pin of the chip U1, the SDA pin is connected to the pull-up resistor R25 and the SDA pin of the chip U1, and the other ends of the resistor R24 and the resistor R25 are respectively connected to the 3.3v voltage.
The metering pulse circuit shown in fig. 9 includes: the anode of the pulse lamp D7 is connected with 3.3v voltage through a resistor R23, the cathode is connected with the PF pin of the chip U1 and a resistor R38, the other end of the resistor R38 is connected with the cathode of the input end of the optocoupler OP1, the anode of the input end of the optocoupler OP1 is connected with 3.3v voltage, and the output end of the optocoupler OP1 outputs pulse metering signals, so that the pulse lamp can be used for verification, and meanwhile, the LED is used for playing the role of active and reactive output prompt.
By adopting the application, the power supply to each module is realized through the power supply circuit, the electric signal of the commercial power of the user side is measured by the electric power measuring module, the electric signal is uploaded to the SOC chip circuit for processing and electric energy metering, the data can be stored in the storage chip, the SOC chip circuit drives the LCD control unit to realize the display of basic information, the verification is realized through the metering pulse circuit, and meanwhile, the data is remotely read through the communication unit.
The technical principle of the present invention is described above in connection with the specific embodiments. The description is made for the purpose of illustrating the general principles of the invention and should not be taken in any way as limiting the scope of the invention. Other embodiments of the invention will occur to those skilled in the art from consideration of the specification and practice of the invention without the need for inventive faculty, and are within the scope of the claims.
Claims (6)
1. Single-phase guide rail type intelligent electric energy meter supporting index management, which is characterized by comprising: the power supply circuit is connected with the SOC chip circuit, the communication unit and the LCD control unit in output end, and is used for supplying power to the modules; the power measurement module inputs commercial power and the output end of the power measurement module is connected with the SOC chip circuit; the SOC chip circuit is used for measuring electric energy, the output end of the SOC chip circuit is connected with the LCD control unit and the storage unit, and the SOC chip circuit is also connected with the communication unit to realize data transmission;
the communication unit adopts 485 communication unit, 485 communication unit includes: the optocouplers OP2, OP3 and 485 communication chips U4 and 485 communication chip U4 adopt HYM3085, the VCC pin is connected with voltage V485, and the pin 4 and the pin 5 of the 485 communication chip U4 are connected with G485;
the power supply circuit adopts an alternating current-direct current conversion switch power supply circuit, the input end of the power supply circuit is connected with mains supply, and the power supply circuit comprises: the power conversion chip U5, the transformer TR1 and the voltage stabilizing chip U6, wherein the power conversion chip U5 adopts PN8175, an S pin of the power conversion chip U5 is grounded and is connected with an output end emitter of the optocoupler OP6, an EN/UV pin is connected with an output end collector of the optocoupler OP6, and a D pin is connected with a 3 end of a primary winding end of the transformer TR 1; the 4 end of the primary winding end of the transformer TR1 is input with the commercial power signal processed by the rectifying and filtering circuit, the 1 end of the primary winding end of the transformer TR1 is grounded, the 2 end is connected with the anode of the diode D3, the cathode of the diode D3 is connected with 3.6v voltage, the anode of the capacitor E3 is grounded, the cathode of the capacitor E3 is connected with the other end of the inductor RS0 through the capacitor C7, the other end of the inductor RS0 is connected with the Vin pin of the voltage stabilizing chip U6, and the Vo pin of the voltage stabilizing chip U6 outputs 3.3v voltage; the end 6 of the secondary winding end of the transformer TR1 is connected with an output voltage G485, the end 5 of the secondary winding end is connected with a diode rectifying circuit, the output end of the rectifying circuit is connected with a resistor R12, the positive electrode of a capacitor E5 and an inductor RS1, the negative electrode of the capacitor E5 is connected with the output voltage G485, and a capacitor C9 is connected between the negative electrode of the capacitor E5 and the inductor RS 1; the other end of the resistor R12 is connected with the positive electrode of the input end of the optocoupler OP6, a resistor R13 is connected between the positive electrode and the negative electrode of the input end of the optocoupler OP6, the negative electrode of the input end of the optocoupler OP6 is connected with the K electrode of the silicon controlled rectifier Q1 and one end of the resistor R26, the A electrode of the silicon controlled rectifier Q1 is connected with the voltage G485, the R electrode is connected with the resistor R29, the resistor R36 and the resistor R37, the other end of the resistor R29 is connected with the voltage V485, the resistors R36 and R37 are connected in parallel, and the other ends of the resistors R36 and R37 are connected with the voltage G485;
the chip U1 of the SOC chip circuit adopts a G80F923 chip, the VDD pin of the chip U1 inputs 3.3v working voltage, the I1N, I P, VN and VP pins of the chip U1 are connected with the power measurement module, the RX and TX pins of the chip U1 are connected with the communication unit, the chip U1 drives the LCD control unit through SEG and COM pins, the chip U1 is also connected with the memory chip U2 through SCL and SDA pins, and the chip U1 is also connected with the metering pulse circuit through PF pins;
the power measurement module includes: an inductor RS2 positioned on a mains supply N line, a resistor string formed by connecting a plurality of resistors in series, and an RC filter circuit, wherein one end of the resistor string is connected with the inductor in series, the other end of the resistor string is connected with the RC filter circuit and a VP pin, and the other end of the RC filter circuit is grounded; the resistor R8 is connected with the capacitor C4 in parallel, one end of the resistor R is grounded, and the other end of the resistor R is connected with the VN pin; the commercial power I-line is connected with an I1P pin after being filtered by a resistor R9 and a capacitor C1; the commercial power I+ line is connected with an I1N pin after passing through a resistor R10 and a capacitor C2.
2. The single-phase guide rail type intelligent electric energy meter supporting index management according to claim 1, wherein: the rectifying and filtering circuit connected to the 4-terminal of the primary winding terminal of the transformer TR1 includes: the positive electrode of the diode D1 is connected with the positive electrode of the capacitor E1, the negative electrode of the capacitor E1 is grounded, and the fuse PTC1 is connected to the line L of the mains supply.
3. The single-phase guide rail type intelligent electric energy meter supporting index management according to claim 1, wherein: the protection circuit is further connected between the D pin of the power conversion chip U5 and the 4 end of the primary winding end of the transformer TR1, and comprises a diode D2, a capacitor C5 and resistors R11 and R16 which are connected in series, wherein the anode of the diode D2 is connected with the D pin of the power conversion chip U5, the cathode of the diode D2 is connected with one end of the capacitor C5 and one end of the resistor R11, and the other end of the capacitor C5 is connected with the other end of the resistor R16 and the 4 end of the primary winding end of the transformer TR 1.
4. The single-phase guide rail type intelligent electric energy meter supporting index management according to claim 1, wherein: the positive electrode of the input end of the optical coupler OP2 is connected with a voltage V485, the negative electrode of the input end of the optical coupler OP2 is connected with an RO pin of a 485 communication chip U4, the collector electrode of the output end of the optical coupler OP2 is connected with a voltage of 3.3V through a resistor R30, and the collector electrode of the output end of the optical coupler OP2 is connected with an RXD1 pin of a chip U1 and the emitter electrode of the output end of the optical coupler OP2 is grounded; the positive electrode of the input end of the optical coupler OP3 is connected with 3.3V voltage through a pull-up resistor R31, the negative electrode of the input end is connected with the TXD1 pin of the chip U1, the collector electrode of the output end is connected with the voltage V485, and the emitter electrode of the output end is connected with the DI pin of the communication chip U4; the resistor R34 is connected between the A pin and the VCC pin of the 485 communication chip U4, the B pin of the 485 communication chip U4 is grounded, and the TVS tube is connected between the A, B pins.
5. The single-phase guide rail type intelligent electric energy meter supporting index management according to claim 1, wherein: the memory chip U2 adopts a 24C256 chip, wherein a VCC pin is connected with 3.3v voltage, an SCL pin is connected with a pull-up resistor R24 and an SCL pin of the chip U1, and an SDA pin is connected with a pull-up resistor R25 and an SDA pin of the chip U1.
6. The single-phase guide rail type intelligent electric energy meter supporting index management according to claim 1, wherein: the metering pulse circuit comprises: the anode of the pulse lamp D7 is connected with 3.3v voltage through a resistor R23, the cathode is connected with the PF pin of the chip U1 and a resistor R38, the other end of the resistor R38 is connected with the cathode of the input end of the optocoupler OP1, the anode of the input end of the optocoupler OP1 is connected with 3.3v voltage, and the output end of the optocoupler OP1 outputs pulse metering signals.
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