CN106154030A - A kind of intelligent electric meter and data encryption and transmission method thereof - Google Patents
A kind of intelligent electric meter and data encryption and transmission method thereof Download PDFInfo
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Abstract
The invention discloses a kind of intelligent electric meter and data encryption and transmission method thereof, intelligent electric meter includes MCU module and power module, and what MCU module connected has display module, key-press module, communication module, current acquisition module, voltage acquisition module and temperature sensing module.MCU module comprises STC12C5A40AD, has EEPROM function inside it.Display module is made up of with audion LED charactron, key-press module is microswitch composition, communication module uses MAX485 conversion, current acquisition module is made up of current transformer/sampling resistor and RC filter network, voltage acquisition module is made up of voltage transformer/divider resistance and RC filter network, sends into ATT7053BU process after voltage, current signal collection.Reliable design of the present invention, precision are high, multiple functional, can be used for measuring reading instument and relevant auxiliary unit.
Description
Technical field
The present invention relates to electric-power metering field, especially relate to a kind of intelligent electric meter and data encryption and transmission method thereof.
Background technology
In electric instrument industry, tradition motor meter is eliminated by electronic electricity meter.Electronic instrument skill in the market
Art is ripe, and precision is high, good reliability, can telecommunication, be widely used space, along with power industry and the demand in market,
Instrument just towards intelligent, in high precision, multi-functional, radio meter register direction develops.Exist all in all fields due to electronic instrument
Many advantages, especially can telecommunication, it is possible to realizing electric power monitoring centralization, therefore electronic instrument substitutes tradition vicarious
Instrument is inexorable trend.
Now with electronic instrument be usually data directly uploaded with form in plain text, safe coefficient is not high enough, exists
The risk that data are trapped, distort.
Summary of the invention
The present invention mainly solves the technical problem that intelligence degree is not high enough, safety is more weak existing for prior art,
A kind of precision height, good reliability, the intelligent electric meter of high safety and data encryption and transmission method thereof are provided.
The present invention is directed to what above-mentioned technical problem was mainly addressed by following technical proposals: a kind of intelligent electric meter, bag
Include MCU module, display module, key-press module, communication module, current acquisition module, voltage acquisition module, electric-power metering
Module and the power module powered for whole intelligent electric meter, described display module, key-press module, communication module and electric-power metering mould
Block is all connected with MCU module, and described current acquisition module and voltage acquisition module are connected to electric-power metering module.
MCU module is to control the work of other modules.The parameter of display module display intelligent electric meter and state.Key-press module
For being set control.Communication module realizes the communication between intelligent electric meter and host computer.Current acquisition module gathers current electricity
Stream, voltage acquisition module gathers current voltage, the electric-power metering module output data to current acquisition module and voltage acquisition module
MCU module it is sent to after processing.Whole electric-power metering process is completed by intelligent electric meter completely, it is not necessary to manually participate in.
As preferably, described MCU module includes STC12C5A40AD chip.STC12C5A40AD chip internal is certainly
Band data storage, power down can preserve data.STC12C5A40AD is 8051 kernel MCU, more traditional 8051 kernel fortune
Scanning frequency rate is fast, and disposal ability is higher.
As preferably, described display module include two 3 Digital sum pipes, 7 models be the audion of S9012,7 send out
Optical diode and several resistance；8 feet of 3 Digital sum pipes, 9 feet and 12 feet respectively connect the colelctor electrode of an audion, remaining
Foot is all connected to MCU module by resistance；The positive pole of 7 light emitting diodes is all connected to the colelctor electrode of an audion；Negative
Pole is all connected to MCU module by resistance；The emitter stage of audion all connects power supply+5V, and base stage is all connected to by resistance
MCU module.
MCU module drives 3 Digital sum pipe and light emitting diodes by audion.
As preferably, described key-press module includes 5 microswitch and 5 pull-up resistors, the first of each microswitch
End is all connected to MCU module, the second end all ground connection, and the first end of each pull-up resistor each connects the of a microswitch
One end, the second end of pull-up resistor all connects power supply+5V.
Display module and key-press module coordinate can show different parameters intuitively, uses charactron to show with LED light
Show that temperature influence is little.
As preferably, described communication module includes opto-coupler chip, MAX485 chip and Transient Suppression Diode, described light
Coupling chip is TLP521-3-D chip, and 2 feet of opto-coupler chip and 6 feet connect MCU module by resistance, and 10 feet directly connect
Connecing MCU module, 1 foot and 5 feet connect power supply VCC, and 3 feet connect power supply VCC_D, and 4 feet are connected by resistance
1 foot of MAX485 chip；12 feet of opto-coupler chip connect 4 feet of MAX485 chip, and 8 feet of opto-coupler chip connect
2 feet of MAX485 chip and 3 feet；7 feet of opto-coupler chip and 11 feet connect power supply GND_D, 9 foot ground connection；Optocoupler core
12 feet of sheet connect power supply VCC_D also by resistance, and 10 feet connect power supply VCC also by resistance, and 8 feet are also by resistance
Connect power supply VCC_D；8 feet of MAX485 chip connect power supply VCC_D, and 7 feet and 6 feet are the outfan of communication module
Mouthful, 5 feet connect power supply GND_D；Transient Suppression Diode is connected across between 6 feet of MAX485 chip and 7 feet,
Resistance R22 also it is serially connected with between 6 feet and 7 feet of MAX485 chip；8 feet of MAX485 chip are also by electric capacity C23
Connecting power supply GND_D, 7 feet connect power supply GND_D also by resistance R24, and 6 feet connect power supply also by resistance R21
VCC_D；Resistance R25 one end connects power supply GND_D, other end ground connection.
Communicated by RS485 agreement between communication module and host computer.
As preferably, described current acquisition module includes current transformer, resistance R27, resistance R31, resistance R35, electricity
Resistance R36, resistance R38, resistance R40, resistance R43, resistance R46, variable resistance R28, electric capacity C32, electric capacity C34
With electric capacity C35, described current transformer is HWCT-20A/20mA transformer, and 5 feet of current transformer and 6 feet are exchange
Electric current incoming end, 2 feet connect convertible tip and the first definite value end of variable resistance R28, and 1 foot is connected by resistance R35 can power transformation
The second definite value end of resistance R28；First end of resistance R31 connects 2 feet of current transformer, the second end ground connection；Resistance R36
First end connect current transformer 1 foot, the second end ground connection；First end of resistance R27 connects 2 feet of current transformer；
Resistance R38 first end connect current transformer 1 foot, second end of resistance R27 with second end of resistance R38 for exchanging
Current output terminal；First end of electric capacity C32 connects second end of resistance R27, the second end ground connection of electric capacity C32；Electric capacity
First end of C35 connects second end of resistance R38, the second end ground connection of electric capacity C35；Electric capacity C34 is connected across resistance R27
The second end and second end of resistance R38 between；The two ends of resistance R43 are DC current incoming end, the first of resistance R40
End connects first end of resistance R43；First end of resistance R46 connects second end of resistance R43, second end of resistance R40
It is DC current outfan with second end of resistance R46.
As preferably, described voltage acquisition module includes voltage transformer, resistance R26, resistance R30, resistance R32, electricity
Resistance R33, resistance R34, resistance R37, resistance R39, resistance R41, resistance R42, resistance R44, resistance R45, can
Power transformation resistance R29, electric capacity C31, electric capacity C33 and electric capacity C36, described voltage transformer is TV1005 transformer；Voltage is mutual
2 feet of sensor are the first alternating voltage incoming end, and 1 foot connects the second alternating voltage incoming end by resistance R32；Mutual induction of voltage
4 feet of device connect convertible tip and the first definite value end of variable resistance R29, and 3 feet connect variable resistance R29 by resistance R33
The second definite value end；First end of resistance R30 connects 4 feet of voltage transformer, the second end ground connection；The first of resistance R34
End connects 3 feet of voltage transformer, the second end ground connection；First end of resistance R26 connects 4 feet of voltage transformer,；Resistance
First end of R37 connects 3 feet of voltage transformer, and second end of resistance R26 and second end of resistance R37 are alternating voltage
Outfan；First end of electric capacity C31 connects second end of resistance R26, the second end ground connection of electric capacity C31；Electric capacity C36's
First end connects second end of resistance R37, the second end ground connection of electric capacity C36；Electric capacity C33 is connected across the second of resistance R26
Between end and second end of resistance R37；First end of resistance R39 is the first DC voltage incoming end, and the second end passes through resistance
R41 connects first end of resistance R42；First end of resistance R45 is the second DC voltage incoming end, the second of resistance R42
Second end of end and resistance R45 is DC voltage output end；Resistance R44 is connected across the first end and the resistance R45 of resistance R42
The first end between.
This intelligent electric meter can measure alternating current or unidirectional current.When measuring alternating current, the alternating current of current acquisition module
Incoming end accesses test line, and alternating current outfan is connected to electric-power metering module, and DC current incoming end and DC current are defeated
Go out to hold unsettled；First alternating voltage incoming end of voltage measurement module and the second alternating voltage incoming end access test line, exchange
Voltage output end connects electric-power metering module, the first DC voltage incoming end, the second DC voltage incoming end and direct voltage output
Hold the most unsettled.When measuring unidirectional current, the DC current incoming end of current acquisition module accesses test line, and DC current exports
It is unsettled that end is connected to electric-power metering module, alternating current incoming end and alternating current outfan；First direct current of voltage measurement module
Voltage incoming end and the second DC voltage incoming end access test line, DC voltage output end connection electric-power metering module, first
Alternating voltage incoming end, the second alternating voltage incoming end and ac voltage output are the most unsettled.
As preferably, described electric-power metering module includes ATT7053BU chip, 6 feet of ATT7053BU chip and 7
Foot connects ac voltage output or the DC voltage output end of voltage acquisition module, 10 feet and 11 feet and connects current acquisition module
Alternating current outfan or DC current outfan.
Current acquisition module and voltage acquisition module share ATT7053BU.Described MCU module and described ATT7053BU
Use SPI serial communication, described current acquisition module and the output of the voltage acquisition module transformer difference letter after capacitance-resistance filter
Number send a day ATT7053BU chip pin.
ATT7053BU be specialty electric energy computation chip, can realize alternating voltage, electric current, active power, reactive power,
Apparent merit, power factor and electric energy also can realize the measurement of DC voltage, electric current and power, and this chip detection precision is high, steady
Qualitative good, reliability is high, external devices is few so that circuit design is greatly simplified.
Data read-out in ATT7053BU, by connecting ATT7053BU computation chip, can be calculated by MCU module
The parameters such as voltage, electric current, power.
As preferably, intelligent electric meter also includes that temperature sensing module, described temperature sensing module are connected with MCU module.
Temperature sensing module collecting temperature information is sent to MCU module.
A kind of data encryption and transmission method based on above-mentioned intelligent electric meter, comprises the following steps:
A, host computer generate random integers N of 0 to 8, are sent to intelligent electric meter；
B, intelligent electric meter store and upload the maximum temperature K1 detected the previous day, at No. 11+N No. 2+N of this metering cycle
Store and upload the maximum temperature K2 detected the previous day, store and upload, at No. 20+N, the maximum temperature detected the previous day
K3, the destination end uploaded is host computer；
C, intelligent electric meter be maximum current I1 in the electricity consumption number of degrees W1 read day of checking meter in this metering cycle and this metering cycle, by two
The packing of individual data is encrypted later, and key is the electricity consumption number of degrees W0 of a upper metering cycle, the maximum of a upper metering cycle
K1, K2 and the K3 uploaded in electric current I0 and this metering cycle；
Data after encryption are uploaded to host computer by D, intelligent electric meter；
E, host computer use the data key deciphering of correspondence after receiving data, and the data after deciphering are stored, then
Enter step A.
Each ingredient of key is in a different manner (, in plain text, WO and I0 is encryption data for K1, K2 and K3)
Uploading, and uplink time is to determine at random, be trapped difficulty very big, safety is high.
The intelligent electric meter of this programme can measure when using transformer input the voltage of alternating current, electric power, power, power because of
Number, active power and reactive power, use pure resistance can measure DC voltage when inputting, electric current can support 485 communications, firmly
The versatility of part has obtained good utilization.
The substantial effect that the present invention brings is, intelligence degree and precision are high, good reliability, the data uploaded be difficult to by
Cracking, safety coefficient is high.
Accompanying drawing explanation
Fig. 1 is a kind of system module figure of the present invention；
Fig. 2 is the circuit structure diagram of a kind of MCU module of the present invention；
Fig. 3 is the circuit structure diagram of a kind of display module of the present invention；
Fig. 4 is the circuit structure diagram of a kind of key-press module of the present invention；
Fig. 5 is the circuit structure diagram of a kind of communication module of the present invention；
Fig. 6 is the circuit structure diagram of a kind of current acquisition module of the present invention；
Fig. 7 is the circuit structure diagram of a kind of voltage acquisition module of the present invention；
Fig. 8 is the circuit structure diagram of a kind of electric-power metering module of the present invention；
In figure: 1, MCU module, 2, power module, 3, display module, 4, key-press module, 5, communication module, 6, electric current
Acquisition module, 7, voltage acquisition module, 8, electric-power metering module, 9, temperature sensing module.
Detailed description of the invention
Below by embodiment, and combine accompanying drawing, technical scheme is described in further detail.
Embodiment: a kind of intelligent electric meter of the present embodiment, as it is shown in figure 1, comprise MCU module 1, power module 2,
Display module 3, key-press module 4, communication module 5, current acquisition module 6, voltage acquisition module 7, electric-power metering module 8
With temperature sensing module 9.Display module 3, key-press module 4, communication module 5, electric-power metering module 8 and temperature sensing module
9 are all connected with MCU module 1, and current acquisition module 6 and voltage acquisition module 7 are connected to electric-power metering module 8.
MCU module comprises STC12C5A40AD chip, and inside carries data storage.Electric-power metering module includes
ATT7053BU chip.Current acquisition module includes single-phase current transformer and copper-manganese sampling resistor, and current transformer is used for
Detection alternating current, copper-manganese sampling resistor is used for detecting DC current, installs copper-manganese sampling resistor when gathering DC current,
Installing current transformer during detection alternating current, the current signal collected is through capacitance-resistance filter access corresponding with difference sample circuit
10～11 feet of ATT7053BU chip.Voltage acquisition module includes single-phase potential transformer and divider resistance, single in detection
Installing voltage transformer during cross streams voltage, install divider resistance during detection DC voltage, the voltage signal collected passes through capacitance-resistance
Corresponding 6～7 feet accessing ATT7053BU chip after filtering.
ATT7053BU integrated chip electric energy metrical, reliable operation, superior performance, with low cost, module is enriched, internal
Integrated high-precision A/D and RMS-DC converter coordinate the detection that can realize the signal such as electric current, voltage easily with MCU.
Comprising EEPROM function inside STC12C5A40AD, power failure data can continue to preserve；ATT7053BU is connected
Electric current, voltage acquisition module will be saved in internal register after the signal processing of detection, MCU is read by SPI serial line interface
Depositor within ATT7053BU can obtain the data such as electric current, voltage, and the data processed through MCU can pass through order wire
Communicate with PC, PC monitors parameters of electric power.
Power module be designed as by single-phase voltage through step-down transformer blood pressure lowering, rectification, filtering, voltage stabilizing again give system power supply.
For simplifying Power Management Design, MCU module and electric current, voltage acquisition module all select 5V power supply chip, STC12C5A40AD
Power pins 38 adds C26 filter capacitor, and ATT7053BU digital power pin 1 adds C17 filter capacitor, and analog power adds
R19, C24 constitute RC wave filter, the simulation of ATT7053BU ground with digitally carry out single-point altogether.
Fig. 3 is display module, uses S9012 to drive CPS05631BR model LED charactron and light emitting diode, electricity
Road is simple and reliable, can show when doing ac power meter electric current, voltage, active power, reactive power, apparent energy, power because of
Number, and what data of thing of display can be found out on charactron intuitively so that use convenient, LED light
Can display instrument table status, can simply determine and be automatic/hand range and be presently in range ability.
Fig. 4 is key-press module, uses microswitch, adds external pull-up resistor to improve interference free performance.
Fig. 5 is communication module, uses MAX485 to carry out electric stipulations conversion, and MAX485 uses independent power supply, MCU
Serial Port Line RX/TX realizes being connected with MAX485 by light-coupled isolation, and MAX485 differential lines A/B uses P6KE6.8CA
Protecting, RS485 communication uses single MCU pin to control data transfer direction, to ensure to cut in reception/transmission data mode
Certain time-delay is done, it is ensured that data transmission is reliable and stable when changing.Use RS485 communication can realize reading instrumented data at a distance,
On data wire can multiple instrument in parallel, the address of each instrument can be set.
Fig. 6 is current acquisition module, makes Current Transformer for alternating current detection, the output signal of current transformer
Filtering garbage signal through a RC filter network, after filtering, the signal of output is differential signal, and differential signal is connected to
The pin 10～11 of ATT7053BU, can realize the adjustment of output signal size by the adjustable resistance of regulation RC filter network,
Calibration time by regulate this potentiometer can realize easily calibration；Detection for DC current uses the inspection of copper-manganese sampling resistor
Surveying, resistance sampling signal accesses the pin 10～11 of ATT7053BU, the data collected through the filtered differential signal of RC
Automatically process inside ATT7053BU as virtual value；Collection for alternating current with DC current signal can only choose one of two,
Selective Soldering need to be carried out time the most hard-wired.
Fig. 7 is voltage acquisition module, uses voltage transformer, the output signal of voltage transformer for alternating voltage detection
Filtering garbage signal through a RC filter network, after filtering, the signal of output is differential signal, and differential signal is connected to
The pin 6～7 of ATT7053BU, can realize the adjustment of output signal size by the adjustable resistance of regulation RC filter network,
Calibration time by regulate this potentiometer can realize easily calibration；Detection for DC voltage uses R39, R41, R44
Metalfilmresistor carries out dividing potential drop detection, and potential-divider network makes input impedance ＞ 1Mohm, and R34 resistance sampling signal filters through RC
After differential signal access ATT7053BU pin 6～7, the data collected automatically process inside ATT7053BU into
Virtual value；Collection for alternating current with d. c. voltage signal can only choose one of two, and need to select time the most hard-wired
Selecting property is welded.
Fig. 8 is electric-power metering module, and the reset of described ATT7053BU uses outside RC electrification reset, digital power
DVCC and analog power AVCC use RC wave filter is connected, internal reference output pin VREF use 10uF and
The electric capacity of 0.1uF is filtered increasing the reliability of benchmark.The digital circuits section of ATT7053BU and mould in the present embodiment
Intend part (containing electric current, power supply acquisition module) and use single-point altogether, to improve system stability.
The data encryption and transmission method of intelligent electric meter comprises the following steps:
A, host computer generate random integers N of 0 to 8, are sent to intelligent electric meter；
B, intelligent electric meter store and upload the maximum temperature K1 detected the previous day, at No. 11+N No. 2+N of this metering cycle
Store and upload the maximum temperature K2 detected the previous day, store and upload, at No. 20+N, the maximum temperature detected the previous day
K3, the destination end uploaded is host computer；
C, intelligent electric meter be maximum current I1 in the electricity consumption number of degrees W1 read day of checking meter in this metering cycle and this metering cycle, by two
The packing of individual data is encrypted later, and key is the electricity consumption number of degrees W0 of a upper metering cycle, the maximum of a upper metering cycle
K1, K2 and the K3 uploaded in electric current I0 and this metering cycle；
Data after encryption are uploaded to host computer by D, intelligent electric meter；
E, host computer use the data key deciphering of correspondence after receiving data, and the data after deciphering are stored, then
Enter step A.
Generate random number after host computer data after receiving encryption successful decryption and be sent to intelligent electric meter.Such as copy
Table day is No. 10 of every month, and host computer receives intelligent electric meter after March 10 reading and encrypted the data uploaded, logarithm
According to deciphering, successful decryption then generates random number, if the random number generated is 4, then intelligent electric meter uploaded 3 March 15
The maximum temperature K2 of the moon 14, uploaded the maximum temperature K3 on March 23, uploaded April April 6 March 24
The maximum temperature K1 of No. 5.Temperature data is collected by temperature sensing module.
One metering cycle is two adjacent times checking meter between day, and intelligent electric meter reads this metering cycle after terminating
Terminate, enter next metering cycle.
During to April 10, intelligent electric meter reads after checking meter March 10 to electricity used when currently checking meter, and this
Maximum current in the section time, then uses key encryption.Encryption can make to complete with the following methods: by W0, I0, K1,
K2 and K3 cascade, character string cascade obtained carries out MD5 computing, take operation result front 56 as secondary key,
Secondary key is used to be packed by des encryption algorithm April 10 the was checked meter electricity consumption number of degrees W1 obtained and maximum current I1
After data be encrypted.
Data after encryption are uploaded by intelligent electric meter, and host computer transfers W0, I0, K1, K2 and K3 from data base, right
Should be decrypted and obtain W1 and I1, then W1 and I1 be stored, and regenerate random number and be sent to intelligent electric meter, make
For the N to this metering cycle on the 10th in May on the April 10.
Specific embodiment described herein is only to present invention spirit explanation for example.The technical field of the invention
Technical staff described specific embodiment can be made various amendment or supplement or use similar mode to substitute, but
Without departing from the spirit of the present invention or surmount scope defined in appended claims.
Although the most more employing the term such as MCU, electric-power metering, but it is not precluded from using the probability of other term.
Use these terms to be only used to more easily to describe and explain the essence of the present invention；It is construed as what any one was added
It is all contrary with spirit of the present invention for limiting.
Claims (10)
1. an intelligent electric meter, it is characterised in that include that MCU module, display module, key-press module, communication module, electric current are adopted
Collection module, voltage acquisition module, electric-power metering module and the power module powered for whole intelligent electric meter, described display module,
Key-press module, communication module and electric-power metering module are all connected with MCU module, described current acquisition module and voltage acquisition mould
Block is connected to electric-power metering module.
A kind of intelligent electric meter the most according to claim 1, it is characterised in that described MCU module includes
STC12C5A40AD chip.
A kind of intelligent electric meter the most according to claim 1 and 2, it is characterised in that described display module includes two 3 figure places
Code pipe, 7 models are the audion of S9012,7 light emitting diodes and several resistance；8 feet of 3 Digital sum pipes, 9 feet
With the colelctor electrode that 12 feet respectively connect an audion, remaining foot is all connected to MCU module by resistance；7 light emitting diodes
Positive pole be all connected to the colelctor electrode of an audion；Negative pole is all connected to MCU module by resistance；The emitter stage of audion
All connecting power supply+5V, base stage is all connected to MCU module by resistance.
A kind of intelligent electric meter the most according to claim 1, it is characterised in that described key-press module includes 5 microswitch and 5
Individual pull-up resistor, the first end of each microswitch is all connected to MCU module, the second end all ground connection, each pull-up resistor
First end each connects the first end of a microswitch, and the second end of pull-up resistor all connects power supply+5V.
5. according to a kind of intelligent electric meter described in claim 1 or 4, it is characterised in that described communication module include opto-coupler chip,
MAX485 chip and Transient Suppression Diode, described opto-coupler chip is TLP521-3-D chip, 2 feet of opto-coupler chip and 6
Foot connects MCU module by resistance, and 10 feet are directly connected to MCU module, and 1 foot and 5 feet connect power supply VCC, and 3 feet are even
Meeting power supply VCC_D, 4 feet connect 1 foot of MAX485_ chip by resistance；12 feet of opto-coupler chip connect MAX485
4 feet of chip, 8 feet of opto-coupler chip connect 2 feet and 3 feet of MAX485 chip；7 feet of opto-coupler chip and 11 feet are even
Connect power supply GND_D, 9 foot ground connection；12 feet of opto-coupler chip connect power supply VCC_D also by resistance, and 10 feet are also by electricity
Resistance connects power supply VCC, and 8 feet connect power supply VCC_D also by resistance；8 feet of MAX485 chip connect power supply
VCC_D, 7 feet and 6 feet are the output port of communication module, and 5 feet connect power supply GND_D；Transient Suppression Diode bridges
Between 6 feet and 7 feet of MAX485 chip, between 6 feet and 7 feet of MAX485 chip, also it is serially connected with resistance R22；
8 feet of MAX485 chip connect power supply GND_D also by electric capacity C23, and 7 feet connect power supply also by resistance R24
GND_D, 6 feet connect power supply VCC_D: resistance R25 one end also by resistance R21 and connect power supply GND_D, the other end
Ground connection.
A kind of intelligent electric meter the most according to claim 1, it is characterised in that described current acquisition module include current transformer,
Resistance R27, resistance R31, resistance R35, resistance R36, resistance R38, resistance R40, resistance R43, resistance R46,
Variable resistance R28, electric capacity C32, electric capacity C34 and electric capacity C35, described current transformer is HWCT-20A/20mA mutual inductance
Device, 5 feet of current transformer and 6 feet are alternating current incoming end, and 2 feet connect the convertible tip and first of variable resistance R28 to be determined
Value end, 1 foot connects the second definite value end of variable resistance R28 by resistance R35；It is mutual that first end of resistance R31 connects electric current
2 feet of sensor, the second end ground connection；First end of resistance R36 connects 1 foot of current transformer, the second end ground connection；Resistance
First end of R27 connects 2 feet of current transformer；First end of resistance R38 connects 1 foot of current transformer, resistance R27
The second end and second end of resistance R38 be alternating current outfan；First end of electric capacity C32 connects the second of resistance R27
End, the second end ground connection of electric capacity C32；First end of electric capacity C35 connects second end of resistance R38, the second of electric capacity C35
End ground connection；Electric capacity C34 is connected across between second end of resistance R27 and second end of resistance R38；The two ends of resistance R43 are
DC current incoming end, first end of resistance R40 connects first end of resistance R43,；First end of resistance R46 connects resistance
Second end of R43, second end of resistance R40 and second end of resistance R46 are DC current outfan.
A kind of intelligent electric meter the most according to claim 1, it is characterised in that described voltage acquisition module include voltage transformer,
Resistance R26, resistance R30, resistance R32, resistance R33, resistance R34, resistance R37, resistance R39, resistance R41,
Resistance R42, resistance R44, resistance R45, variable resistance R29, electric capacity C31, electric capacity C33 and electric capacity C36, described electricity
Pressure transformer is TV1005 transformer；2 feet of voltage transformer are the first alternating voltage incoming end, and 1 foot passes through resistance R32
Connect the second alternating voltage incoming end；The convertible tip of 4 feet connection variable resistance R29 of voltage transformer and the first definite value end, 3
Foot connects the second definite value end of variable resistance R29 by resistance R33；First end of resistance R30 connects the 4 of voltage transformer
Foot, the second end ground connection；First end of resistance R34 connects 3 feet of voltage transformer, the second end ground connection；The of resistance R26
One end connects 4 feet of voltage transformer,；First end of resistance R37 connects 3 feet of voltage transformer, the second of resistance R26
Second end of end and resistance R37 is ac voltage output；First end of electric capacity C31 connects second end of resistance R26, electricity
Hold the second end ground connection of C31；First end of electric capacity C36 connects second end of resistance R37, the second end ground connection of electric capacity C36；
Electric capacity C33 is connected across between second end of resistance R26 and second end of resistance R37；First end of resistance R39 is first straight
Stream voltage incoming end, the second end connects first end of resistance R42 by resistance R41；First end of resistance R45 is second straight
Stream voltage incoming end, second end of resistance R42 and second end of resistance R45 are DC voltage output end；Resistance R44 bridges
Between first end and first end of resistance R45 of resistance R42.
8. according to a kind of intelligent electric meter described in claim 6 or 7, it is characterised in that described electric-power metering module includes
ATT7053BU chip, 6 feet of described ATT7053BU chip and 7 feet connect the alternating voltage output of voltage acquisition module
End or DC voltage output end, 10 feet and 11 feet connect alternating current outfan or the DC current outfan of current acquisition module.
A kind of intelligent electric meter the most according to claim 1, it is characterised in that also including temperature sensing module, described temperature passes
Sense module is connected with MCU module.
10. a data encryption and transmission method based on the intelligent electric meter described in claim 1, it is characterised in that comprise the following steps:
A, host computer generate random integers N of 0 to 8, are sent to intelligent electric meter；
B, intelligent electric meter store and upload the maximum temperature K1 detected the previous day, at No. 11+N No. 2+N of this metering cycle
Store and upload the maximum temperature K2 detected the previous day, store and upload, at No. 20+N, the maximum temperature detected the previous day
K3, the destination end uploaded is host computer；
C, intelligent electric meter be maximum current I1 in the electricity consumption number of degrees W1 read day of checking meter in this metering cycle and this metering cycle, by two
The packing of individual data is encrypted later, and key is the electricity consumption number of degrees W0 of a upper metering cycle, the maximum of a upper metering cycle
K1, K2 and the K3 uploaded in electric current IO and this metering cycle；
Data after encryption are uploaded to host computer by D, intelligent electric meter；
E, host computer use the data key deciphering of correspondence after receiving data, and the data after deciphering are stored, then
Enter step A.
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