CN201562317U - Three-phase three-wire CPU card intelligent electric energy meter - Google Patents

Abstract

The utility model relates to electric meter field, especially relates to a three-phase three-wire CPU card intelligent electric meter, including MCU, an electric energy metering module, a CPU card read circuit, a radio frequency card cipher key analysis circuit, a data storage module, a clock module, a LED display module, an alarm and a peripheral circuit thereof, an infrared communication module, a card read chip and a peripheral circuit thereof, a check circuit, a push-shaped wheel circuit, a MAX13085 full duplex transceiver module and a power supply module for supplying power for the whole inner functional circuits. When a user goes to an administration sector to buy power bya non-contact intelligent CPU card, the administration sector writes purchased amount into the CPU card by a special-purpose card write machine, then the user may reuse the card. During a power supply period, when there are conditions of phase lack, over load, insufficient amount, the electric energy meter may alarm in time, when the balance amount of the card is used up, the electric energy meter is switching off by an AC contactor, the user need buy power to recover the electric energy meter to supply power again.

Description

A kind of phase three-wire three CPU card intelligent electric energy meter

(1), technical field

The utility model relates to the ammeter field, particularly a kind of phase three-wire three CPU card intelligent electric energy meter.

(2), background technology

Human manual labor and brainwork have been saved in the discovery of electricity and application greatly, make human strength length go up wing, and human information feeler is constantly extended.Electricity has two aspects to human lives's influence: obtaining of energy transforms and transmission the basis of electronic information technology.The device that is used for writing down the electricity consumption number of degrees belongs to known article, be commonly referred to as ammeter, at present, the ammeter great majority of Shi Yonging are mechanical in the world, and the mechanical type ammeter has power stealing of causing easily and fornication staff to cause the various managerial disappearance of the huge loss of Utilities Electric Co. in the use.Be used to measure the lambda line of the ammeter of power consumption by live wire, outlet and zero line and current coil, potential winding is formed, current coil is serially connected between live wire lambda line and the live wire outlet, potential winding is serially connected between live wire lambda line and the zero line, electric current during by current coil ammeter record user's power consumption, the method of user's stealing is to unscrew the fixedly stationary pipes screw of live wire lambda line and live wire outlet, take off live wire lambda line and live wire outlet again, with both position transposings, fixing respectively again, during electricity consumption since current coil in the electric current reverse flow, the ammeter counter-rotating, how shown the more power consumption of electricity consumption be more little, homemade property is incurred loss, and manual metering wastes time and energy, can not avoid the generation of this kind " power stealing " behavior.Nowadays, intelligent ammeter has been widely used in family and the industry, generally, the intelligent ammeter that is used for family is the single-phase intelligent ammeter, what be used for industry then is the three-phase intelligent ammeter, for intelligent electric meter, a kind of new meter reading method arises at the historic moment, the corresponding stipulations of the management system that the irrigation and drainage that my company puts into effect according to Utilities Electric Co. of part provinces and cities are measured, the spy develops a kind of phase three-wire three CPU card intelligent electric energy meter, and this kind electric energy meter has advantages such as simple, reliable, easy to use, anti-electricity-theft.

(3), utility model content

Do not measure, count card etc. and influence the phenomenon that electric energy meter normally measures in order to solve drawback that existing manual metering brings and the thunderbolt of IC-card prepayment intelligent ammeter; the utility model provides a kind of easy to use, dependable performance, band overload protection, pernicious load identification, anti-electricity-theft phase three-wire three CPU card intelligence prepayment meter, has fully satisfied the social demand of current power cause develop rapidly.

The technical solution of the utility model:

A kind of phase three-wire three CPU card intelligent electric energy meter contains MCU microcontroller, electric energy metrical module, CPU Card Reader circuit, radio-frequency card key analysis circuit, data memory module, clock module, LED display module, warning and peripheral circuit, infrared communication module, Card Reader chip and peripheral circuit thereof, calibration circuit, pushes away the character wheel circuit, MAX13085 full duplex transceiver module and the power module of giving whole inner function circuit power supply.

Power supply department brush before the formal use of ammeter is revised key card (formal key) and is revised key, zero clearing card, the parameter of brushing formal key then are provided with the various parameters that card is provided with electric energy meter, the user holds contactless smart CPU and snaps into administrative authority and pay dues and purchase, administrative authority writes the purchasing amount of money in the contactless smart CPU card with special-purpose writer, and the user can use this card.Because the key of CPU radio-frequency card is the random key by three grades of affirmations of ESAM module the existing incomparable safe reliability of other radio-frequency cards is arranged.

A kind of phase three-wire three CPU of the utility model card intelligent electric energy meter has the open-phase protection function, and when in the three-phase during a certain phase phase shortage, (D3) is bright for the phase shortage pilot lamp; the original closed contact of relay disconnects; the coil losing electricity of external A.C. contactor, electric energy meter outage tripping operation stops to power to the load.System at first provides stable 3V operating voltage to the MCU microcontroller behind the external power source process rectifying and voltage-stabilizing during operate as normal, tested three-phase voltage, electric current is sent into metering module (ADE7758) behind mutual inductor and signal conditioning circuit, the voltage and current signal that metering module is handled the mutual inductor transmission through internal module converts thereof into pulse signal, the MCU microprocessor is gathered the electrical energy pulse of metering module and is stored in ferroelectric memory module (FM24C04), then according to the unit price that is provided with in the table electricity consumption amount of money of examining and making cuts, and the record of swiping the card of recording user, comprise card number, the beginning electricity consumption time, finish the electricity consumption time, the electricity consumption amount of money, information stores such as remaining sum are in data memory module (24C256), the electricity consumption amount of money shows by display module, Card Reader chip (FM1702SL) and peripheral circuit are welded on the antenna plate in addition, when the card operation, can pass through the accurate Card Reader of Card Reader circuit, phase three-wire three CPU card intelligent electric energy meter possesses the infrared communication interface, can with the meter-copy device communication of special use, also support the RS-485 full duplex communication, when remaining sum carries out sound and light alarm when presetting the warning amount of money, and the demonstration remaining sum, the prompting user in time purchases; When power load surpassed table meter maximum allowable power, (D4) was bright for overload light, the outage of ammeter tripping operation simultaneously, and restoring electricity or swipe the card after three minutes restores electricity again; When control section fault or electricity filching behavior appear in electric energy meter, can show error code, count the total failare amount, simultaneously the lock table.After electricity consumption finishes, again contactless CPU card is placed on the card induction zone of electric energy meter, electric energy meter is to sticking into the capable operation of triping, the electricity consumption amount of money that electric energy meter is concluded the business need sends to card, card is the deduction electricity consumption amount of money from wallet automatically, trip after the success, the electric energy meter outage of operating a switch automatically, remaining sum can continue to use in the card.Remaining sum is when using up in card, and electric energy meter is by the A.C. contactor outage of operating a switch, and the user must hold once more and purchase electricity, can restore electricity.

The beneficial effects of the utility model:

(1) the utility model uses contactless CPU card as data transmission media, by the ESAM key module in the table CPU that the user uses is sticked into capable key authentication, makes data transmission have high security, is one of radio-frequency card technology development in future direction.

(2) the utility model adopts advanced electric energy metrical module (ADE7758), has accurate measurement, the advantage of strong interference immunity.

(3) the utlity model has amount of money warning function, open-phase protection function, qualification power defencive function.

(4) description of drawings

Accompanying drawing 1 is the circuit structure block diagram of a kind of phase three-wire three CPU of the utility model card intelligent electric energy meter

Accompanying drawing 2 is the electric energy metrical schematic diagram of a kind of phase three-wire three CPU of the utility model card intelligent electric energy meter

(5) embodiment

A kind of phase three-wire three CPU card intelligent electric energy meter contains MCU microcontroller, electric energy metrical module, CPU Card Reader circuit, radio-frequency card key analysis circuit, data memory module, clock module, LED display module, warning and peripheral circuit, infrared communication module, Card Reader chip and peripheral circuit thereof, calibration circuit, pushes away the character wheel circuit, MAX13085 full duplex transceiver module and the power module of giving whole inner function circuit power supply.

The reset terminal of Card Reader chip (FM1702SL), synchronous clock end, data terminal, sheet select port to be connected to RE0, RE1, RG4, RG3, the RF7 pin of MCU microcontroller respectively, computation chip adopts advanced ADE7758, the chip accurate measurement, and having good antijamming capability, its voltage sample port VAP, VBP, VCP are connected with RA14, RB14, RC14 respectively; Current sample port IAP/IAN, IBP/IBN, ICP/ICN are connected with RA3/RA4, RB3/RB4, RC3/RC4 respectively, metering module has independently clock circuit, guarantee the accuracy of measuring, sheet choosing, data I/O, synchronous clock are connected respectively at the RE5/4/3/2 port of microcontroller, microcontroller is gathered the electrical energy pulse of metering module, and be stored in the ferroelectric memory (FM24C04), the WP of ferroelectric memory circuit, SCL, SDL are connected with the RD2/3/1 port of microcontroller through pull-up resistor R43, R45, R46; Information behind the user card punching, comprise card number, beginning electricity consumption time, finish the electricity consumption time, the electricity consumption amount of money, remaining sum, with information stores such as electricity conditions in data memory module (24C256), remaining sum shows that by display module memory circuit is connected with RE7, RD0, the RD1 port of microcontroller through pull-up resistor R2, R3, R4; The clock of display part circuit is connected with RA1, the RA2 port of microcontroller with data input pin, and infrared transmission module is connected with the asynchronous communication serial ports of microcontroller with the RS-485 communication module.The data terminal of ESAM module, reset terminal, clock end are connected with RD4, RD5, the RD6 port of microcontroller.

Claims (3)

1. a phase three-wire three CPU card intelligent electric energy meter contains the MCU microcontroller, the electric energy metrical module, CPU Card Reader circuit, radio-frequency card key analysis circuit, data memory module, clock module, the LED display module, report to the police and peripheral circuit, the infrared communication module, Card Reader chip and peripheral circuit thereof, the calibration circuit, push away the character wheel circuit, MAX13085 full duplex transceiver module and the power module of giving whole inner function circuit power supply, it is characterized in that: phase three-wire three CPU card intelligent electric energy meter possesses the infrared communication interface, can with the meter-copy device communication of special use, also support the RS-485 full duplex communication.

2. a kind of phase three-wire three CPU card intelligent electric energy meter according to claim 1 is characterized in that: the WP of ferroelectric memory circuit, SCL, SDL are connected with the RD2/3/1 port of microcontroller through pull-up resistor R43, R45, R46.

3. a kind of phase three-wire three CPU card intelligent electric energy meter according to claim 1 and 2, it is characterized in that: electric energy metrical module voltage sample port VAP, VBP, VCP are connected with RA14, RB14, RC14 respectively; Current sample port IAP/IAN, IBP/IBN, ICP/ICN are connected with RA3/RA4, RB3/RB4, RC3/RC4 respectively.

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