CN2179589Y - Electronic card pre-paying watt-hour meter - Google Patents

Abstract

The utility model relates to an electronic card prepayment electric meter, which is used for field measurement and has the functions of prepayment of the power rate and management, wherein, a voltage sampler and a current sampler are composed of a voltage sensor or a thick film resistor network and a current sensor or a manganese copper resistance shunt circuit, the utility model is integrated with an A/D converter, the microcontroller of an ROM and a calendar clock chip, and the electronic card is a piece of E<2>PROM chip. The indirect management function of all electric energy can be realized by the utility model, and the data transmission between an electric meter and a management department via an electronic card can be realized. The utility model has the advantages of compact structure, high reliability, good confidentiality, falsification prevention, imitation prevention and electric larceny prevention. The utility model can meet the long life requirement of the field measurement.

Description

Electronic card pre-paying watt-hour meter

The utility model relates to a kind of electron watt-hour meter, and particularly a kind of in-site measurement that is used for has and collects charges for electricity in advance and the electronics cassette pre payment watthour meter of management function.

Watt-hour meter has in-site measurement, collect charges for electricity in advance and the function of managing is modern requirement of electric industry management and needs, electron watt-hour meter of the prior art is above-mentioned other function of tool only, show that through the Searches of Patent Literature mainly there is following problem in present electron watt-hour meter:

One. used circuits such as analog multiplier, frequency changer and frequency divider to carry out the electric energy conversion, because these circuits are made up of many separating components, integrated level is low, poor anti jamming capability, reliability is low, can not satisfy the requirement of in-site measurement.

Two. unnecessary unnecessary circuit is arranged, if any many amplifiers of usefulness and relative trigger device go to measure power angle, the low chip of many integrated levels of having used that has is that electronic cards is encrypted, and has promptly reduced reliability, does not more bring into play the due effect of single-chip microcomputer.

Three. the technology that collects charges for electricity in advance of use is easily forged, or the technology of having eliminated, as insert coins, magnetic card etc.

Four. lack the electric energy management function.

The purpose of this utility model is to provide a kind of circuit person's part integrated level to change, and good reliability can guarantee that in-site measurement is required long-life, and the electron watt-hour meter with multiple indirect control function.

According to above-mentioned purpose, the utility model has adopted such structure, be that it is by voltage, current sample pretreatment unit, data processing unit, electronic cards, display circuit, key are formed by reaching operation circuit, and the pretreatment unit that it is characterized in that sampling is crossed by electric current, voltage sampling circuit and amplification impact damper; Data processing unit is made of the calendar clock chip of microcontroller chip, analog switch, band random memory and DLL (dynamic link library) device etc.; Sampling and pretreatment unit are with six groups of analog input data signal processing units, six groups of simulating signals are received on the analog input mouth of A/D converter by the analog switch timesharing ground of microcontroller chip control, by microcontroller chip the analog quantity of signal is transformed into digital quantity, and calculates the required various amounts of electric energy indirect control thus; Microcontroller chip deposits the various amounts of computing machine gained in the calendar clock chip of band random memory in, and calculates electricity charge consumption by its readout time; Described data processing unit is connected communication with electronic cards and display circuit with key circuit by the DLL (dynamic link library) device, and is connected with operation circuit by sealing in and going out device, and electronic cards is a slice E ²PROM, it is connected with described circuit by web member.

Said structure of the present utility model can further specify by accompanying drawing.Shown in the drawings is a three-phase and four-line watt-hour meter, and it exchanges at the rated voltage 100V that mutual inductor uses later, electric current 5A exchanges.

The utility model has following accompanying drawing:

Accompanying drawing 1 is a structured flowchart of the present utility model;

Accompanying drawing 2 is the wiring diagram of sampling and pretreatment unit;

Accompanying drawing 3 is the wiring diagram of data processing unit;

Accompanying drawing 4 is electronic cards and shows conversion line figure.

Referring to Fig. 1: the utility model is mainly by sampling and pretreatment unit U ₁, data processing unit U ₂, electronic cards U ₃, display and keyboard U ₄, operation circuit U ₅Form Deng five unit.

Fig. 2 is sampling and pretreatment unit U ₁It is made up of six sampling thiefs and six amplification impact dampers, the listed V in left side among the figure _A, V _BAnd V _CRepresent that respectively A phase, B reach the input of C phase voltage mutually.V _ABe input to R ₁With R ₂On the thick film resistor network of forming, adopt to such an extent that ac voltage signal outputs to IC at a point after the dividing potential drop ₁(amplifier LM/224).IC ₁Work the voltage signal process level translation circuit (R that amplifies after buffer action is amplified ₄And R ₅) by the output of b point, V _BAnd V _CSampling circuit and V _AThe person is identical, respectively by e point and the output of g point.

I _A, I _BAnd I _CRepresent that respectively A phase, B reach the input of C phase current mutually.I _ABe input to testing circuit R ₃With shunt resistance R ₈On the diverting route of forming, adopt to such an extent that AC signal outputs to IC at the c point ₂(amplifier LM/224).Detect resistance R ₃Be copper-manganese resistance, 0.01.IC ₂Rise and amplify buffer action, after it amplifies signal, through level translation circuit (R ₆And R ₇) by the output of d point, I _BAnd I _CSampling circuit and I _AThe person is identical, respectively by f point and the output of h point.

Fig. 3 is singlechip data processing unit U ₂, it is by analog switch IC ₃(AD7503), microcontroller IC ₄(8398), address latch IC ₅(74LS373), calendar clock and RAMIC ₆(DS1216 and RAM6116), interface device IC ₇(8255), reach serial-in parallel-out register IC ₈(74LS164) wait composition.

U ₁Six tunnel simulating signal b, d, e, f, g and the h of output are connected respectively to IC ₃Input pin on, IC ₃The control pin be connected respectively to IC ₄Three high-speed output hso .0, HSO.1 and HSO.2 go up, IC ₃Acceptance is by IC ₄The control signal of high speed output output is switched to IC one by one with six tunnel simulating signals to timesharing ₄The analog input mouth ACH4 of A/D converter on.

Be solidificated in IC ₄ROM in instruction, it control A/D in real time six tunnel analog signal conversion are become V _A, I _A, V _B, I _B, V _CAnd I _CDigital quantity, and calculate the required various amounts of electric energy indirect control (active power, reactive power, applied power, active energy, reactive energy and apparent power consumption etc.) thus.

IC ₄The address/data bus P3 mouth (8) and the P4.0～P4.2 of P4 mouth be connected respectively to IC ₅, IC ₆And IC ₇On, read and write pin (RD and WR) to be connected to IC ₆And IC ₇, the ALE address latch allows to be connected to address latch IC ₅On, P _4.6And P _4.7Receive IC respectively ₆And IC ₇Sheet select CE end, by these lines IC ₄To calculate the above-mentioned various amount outputs of gained and deposit IC in ₆6116 in (DS1216 has lithium battery can preserve data), IC ₄Also from DS1216 readout time, and calculate electricity charge consumption thus, also output in 6116 and preserve.

IC ₄Also, export various control signals in case of necessity according to the result of above various amounts and the contrast of various electric energy management index.

U ₂With U ₃, U ₄Connection, communication be to pass through IC ₇Realize IC ₇I/O port PA, PB and PC respectively directly and U ₃And U ₄Be connected, and IC ₄By its P ₃, P ₄Mouth reaches

,

Pin control IC ₇Read/write, IC in addition ₄High speed input pin HS1.0 and outer interrupt pin EXTINT also directly respectively with U ₃And U ₄Be connected to accept their interrupt request singal.

U ₂And U ₅Connection be by sealing in and going out device IC ₈Realize IC ₄Serial port RXD and TXD receive IC respectively ₈Input pin A and clock pin CLK.IC ₄Give IC by RXD and TXD output control signal ₈, and IC ₈Then with the D of this signal by its delivery outlet ₀～D ₇Pin outputs to U ₅

IC among Fig. 4 ₉Be electronic cards, it only comprises a slice E ²PROM2186, it links to each other with ammeter by web member D, and when electronic cards was inserted D, 2 winding points of D upper end were connected, and make IC ₄HS1.0 pin level step-down, just to IC ₄Imported an interrupt request singal, in view of the above, IC ₄Just export a control signal, through IC ₈To U ₅Power supply (IC with electronic cards ₉V _CCPin) connects.

IC ₉Address mouth A _0～7And A _8～10Respectively with IC ₇PA mouth and C _0～2Link to each other data port D _0～7With IC ₇The PB mouth connect IC ₉Read ( Promptly

), write (

) and the sheet choosing (

) pin is subjected to IC respectively ₇C ₄, C ₅And C ₆The output of pin is controlled.

When need sense data from electronic cards, during as the management parameters of user's payment in advance number or power supply unit, IC ₄The output control signal is given IC ₇, IC ₇Pass through C ₄, C ₅, C ₆The order that output is read is also passed through PA mouth OPADD and is given IC ₉, IC ₉In data promptly pass through D _0～7Output to IC ₇The PB mouth, and by IC ₇Export to IC again ₄, IC ₄Be about to data output, deposit IC in ₆(6116) in.

When need to the electronic cards write data when (, comprising various power, power consumption and electricity charge surplus etc.) as the user power utilization situation, IC ₄The output control signal is given IC ₇, IC ₇By C ₄, C ₅, C ₆, the order write of output and give IC by PA mouth OPADD ₉, IC ₄Promptly from IC ₆6116 in read corresponding data one by one, output to IC ₄In, pass through IC again ₄The PB mouth output to IC ₉D _0～7Thereby, deposit IC ₉In, as for when needing read/write then by U ₄In button control.

Electronic cards plays the effect of Data transmission between power supply unit and ammeter in a word, so do not need other communication apparatus.

Remove IC among Fig. 4 ₉Outward, other all belong to display circuit and push-button unit U ₄, IC wherein ₁₀Be demonstration/keyboard translation interface 8279, IC ₁₁Be address latch 74ls373, IC ₁₂Be eight to select a device 74LS138, IC ₁₀Read (

Or

), write (

) and the sheet choosing (

) pin respectively with IC ₇C ₄, C ₅And C ₇Link to each other and be subjected to the control of its output, IC ₁₀Data select pin A ₀With IC ₇The PA.O pin link to each other and controlled by it, its data output/input port D _0～7Then with IC ₇The PB mouth be connected.IC ₁₀Segment encode delivery outlet OutA and OutB by address latch IC ₁₁Receive (eight) on each charactron scanning output line SL _0～2Select a device to receive each digital reaching by eight by strong (column selection), the capable signal RL that selects of its button of going up ₀Receive on three buttons.

When showing demand, IC ₄Be about to display command and data and output to IC ₇, IC ₇Promptly pass through C ₄, C ₅, C ₇And A ₀Pin outputs to IC with order ₁₀, and data are outputed to IC by the PB mouth ₁₀D _0～7, IC ₁₀Promptly can be automatically by OutA and OutB and SL _0～2Export corresponding signal and on charactron, show.

When button is pressed (a kind of instruction of this expression user), IC ₁₀Can automatically the position of button be preserved and by its look-at-me of interrupt request pin IRQ output to IC ₄Outer interruption EXTINI pin.IC ₄Can output read IC after receiving this request ₁₀Order give IC ₇, IC ₇Promptly pass through C ₄, C ₅, C ₇And A ₀Pin is to IC ₁₀Send the order of reading, and from D _0～7User instruction is read in the PB mouth, and then output to IC ₄(P3 mouth), IC ₄Promptly according to the execution such as the read/write electronic cards of the instruction of receiving, or show operation such as electricity consumption situation.

IC ₁₀Power supply (pin V _CC) also be by IC ₄Pass through IC ₇(the IC of control ₇Pin C ₃), just connect in case of necessity, to reduce the energy consumption of ammeter itself.

Fig. 5 is operation circuit unit U ₅, it mainly is some driving circuits, wherein IC ₁₃Be buffering/driving element 74LS07, its input port and U ₂Middle IC ₈D ₄, D ₅, D ₇Output pin links to each other, the output of its three solid-state relay SSR of delivery outlet control and three SSR respectively with the power switch SW of load _A, SW _BAnd SW _CBe connected.So IC where necessary ₄Can be by control IC ₈D ₅, D ₆And D ₇Cut off the power supply of load.

U ₅In other four triode driver circuits, be subjected to U from top to bottom respectively ₂Middle IC ₈D ₁, D ₀, D ₂Promptly

And IC ₇C ₃Pin promptly

Control, they are operate as normal indication (light emitting diode), acoustic alarm, IC ₉Power supply and IC ₁₀The operation circuit of power supply.

Except that the above-mentioned three-phase and four-line ammeter that is used for high pressure, as the three-phase and four-line ammeter that 380V exchanges being used for, then at the U of Fig. 2 ₁Sampling thief part (dividing potential drop and shunt) in the unit changes electrical quantity sensor-WBGII-JG type voltage sensor into and WBHL-TG type current sensor gets final product, and the circuit of other unit is identical.

From the above mentioned as can be known, such ammeter itself just can be realized whole electric energy indirect control functions and not need to add in addition other equipment.In addition, each ammeter all has special-purpose number to write on the electronic cards, after running through, promptly wipes automatically prepaid data, data on the card are taked double-encryption, prevent the function of copying, palming off reliably so have, moreover the ammeter watchcase is with the steel plate that shielding action is arranged, the reverse supervisory role of power is arranged, also can prevent stealing effectively, in a word, the utility model has following characteristics:

One. realize whole electric energy indirect control functions by ammeter itself, do not need external miscellaneous equipment;

Two. do not need communication apparatus with electronic cards Data transmission between ammeter and administrative authority.

Three. compact conformation, reliability height, can satisfy the long-life needs of in-site measurement.

Four. good confidentiality, can prevent to forge, personation, can be anti-electricity-theft.

Claims (1)

1, a kind of electronic cards pre payment watthour meter comprises electric current, voltage sample and pretreatment unit U ₁, the first U of data processing electricity ₂, electronic cards U ₃, display circuit and button U ₄, operation circuit unit U ₅, it is characterized in that:

(1), U ₁The voltage sample device constitute by voltage sensor or by thick film resistor network, current sampler constitutes by current sensor or by copper-manganese shunt resistance circuit;

(2), U ₂Comprise the microcontroller IC that is integrated with analog to digital converter (A/D) and ROM (read-only memory) ₄, address latch IC ₅, calendar clock and random access memory IC ₆And interface device IC ₇, U ₁Six groups of simulating signal V of middle voltage sample device output _A, V _B, V _CI _A, I _B, I _CIn voltage analog signal connect and amplify impact damper IC ₁, current analog signal meets IC ₂, be connected to analog switch IC then respectively ₃B～h input end, IC ₃Control pin be connected respectively to IC ₄Three high-speed output hso O, HSO.1 and HSO.2 on, IC ₄Address/data bus P3 mouth and P4 mouth be connected on IC respectively ₅, IC ₆, IC ₇On, read and write pin (RD and WR) to be connected to IC ₆And IC ₇, ALE meets IC ₅, P4.6 and P _4.7Receive IC respectively ₆And IC ₇Sheet select CE end;

(3), described U ₂By DLL (dynamic link library) IC ₇With U ₃And U ₄Connect, communication, and seal in and go out device IC by one ₈With U ₅Connect U ₃Be a slice E ²PROM is connected with described circuit by web member D.

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