CN201336059Y

CN201336059Y - Multifunctional prepaid electric energy meter

Info

Publication number: CN201336059Y
Application number: CNU2008202067928U
Authority: CN
Inventors: 骆勇强
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-12-31
Filing date: 2008-12-31
Publication date: 2009-10-28
Anticipated expiration: 2018-12-31

Abstract

The utility model relates to a prepaid electric energy meter used in an electric power system. The electric energy meter comprises a singlechip circuit, a memorizer, an electric energy-impulse acquisition circuit, a switch control circuit, data transfer circuits, a CPU card interface circuit, a display circuit and the like, wherein, the memorizer, the electric energy-impulse acquisition circuit, the switch control circuit, the data transfer circuits, the CPU card interface circuit, the display circuit and the like are connected with the singlechip circuit; the data transfer circuits comprise at least two of an RS 485 circuit, an infrared circuit, a power line carrier circuit and a radio-circuit; and the CPU card interface circuit adopts a plug-in type IC card interface circuit or a radio frequency card type interface circuit. The electric energy meter has the advantages of stable property and various functions; and as the electric energy meter conducts data exchange with a control master station by adopting various uplink communication modes, the condition that the background acquisition data is incomplete caused by the generation of any communication failure when a single channel is adopted is avoided efficiently. Therefore, the utility model enables to improve the work efficiency of an electric energy information acquisition system of a power consumer, and has very high utility value and well market prospect; and as the electric energy meter is further provided with a dedicated ESAM embedded-type security module and a power-off detection module, the use is safe and reliable.

Description

A kind of multi-functional prepayment meter

Technical field

The utility model relates to a kind of prepayment meter.

Background technology

Power supply department measures each user power utilization amount by ammeter, and traditional electricity charge mode of manually pressing for payment of has increased the power department handling cost, can utilize remote meter reading technology and pre-paying kilowatt-hour meter to solve this problem now.Existing prepayment meter also has various ways, and for example the patent No. is to mention the pre-paying kilowatt-hour meter that utilizes paging control among the CN99116904.2, and the patent No. is the code type pre-payment ammeter of mentioning in 200520090889.3.But existing pre-paying kilowatt-hour meter function singleness often aspect metering and communication can not satisfy user's actual request for utilization fully.

The utility model content

Shortcoming at prior art, the purpose of this utility model provides a kind of multi-functional prepayment meter, this ammeter possesses a plurality of dissimilar communication interfaces and upper layer device communicates, the bad situation of communication that may occur when adopting single channel in order to overcome; Have the time-sharing measurement function, overcome the single shortcoming of ammeter function of measuring in the past, adapt to the situation of the nervous count by time sharing of current electric energy; Have special encrypting module, safe and reliable.

For achieving the above object, the technical scheme taked of the utility model is:

A kind of multi-functional prepayment meter is provided, and this ammeter comprises: governor circuit, form by the storer of single-chip microcomputer and storage single-chip microcomputer supplemental characteristic; The electrical energy pulse Acquisition Circuit, the signal of its input end sampling power circuit, output terminal output electric energy measurement data is to single-chip microcomputer; Drawing lock control circuit, its input end receives the outage control signal of single-chip microcomputer, and the relay of output terminal control ammeter inside and then control are communicated with electric line or disconnect; Display circuit is directly driven by single-chip microcomputer, is used to show ammeter parameters data; Power circuit is used to provide power supply to each functional circuit in single-chip microcomputer and the ammeter; Be characterized in increasing and a plurality of the connection be used for the data transfer circuit of upstream data collecting device communication and be used for carrying out the CPU card interface circuit that on-the-spot electric weight is supplemented with money to ammeter with single-chip microcomputer.Described data transfer circuit comprises RS485 circuit, infrared circuit, electrical power carrier circuit and radio-circuit; Described CPU card interface circuit can adopt plug-in type IC-card interface circuit or frequency card type interface circuit.

Described prepayment meter also comprises the ESAM embedded safety module that is used for the data of CPU card are carried out encryption and decryption that is connected with single-chip microcomputer.

Described prepayment meter also comprises the power failure detection circuit that is used to detect ammeter internal relay output end voltage that is connected with single-chip microcomputer.

Described prepayment meter also comprises the indicator light circuit that is connected with single-chip microcomputer, comprises power light, communications status pilot lamp, pulse pilot lamp and drawing lock pilot lamp.

Prepayment meter stable performance described in the utility model, diverse in function, it adopts multiple communication channel and power department control center to carry out exchanges data, receive the control center's instruction or the transferring electric power data that make progress, make that data can be stablized, reliable transmission, in a single day communication failure occurs when effectively having avoided adopting single channel and influence the situation of whole Operation of Electric Systems; It also has special ESAM embedded safety module and outage detection module, and is safe and reliable.

Description of drawings

Fig. 1 forms schematic block diagram for the utility model function.

Embodiment

The utility model is described in further detail below in conjunction with drawings and Examples.

As shown in Figure 1, the utility model comprises single-chip microcomputer and the storer that is connected with single-chip microcomputer, electrical energy pulse Acquisition Circuit, drawing lock control circuit, data transfer circuit, CPU card interface circuit, display circuit, power circuit etc.

Single-chip microcomputer and storer are formed governor circuit, are used for coordinating other each functional circuit module work of control.

That described data transfer circuit is integrated is infrared, RS485, power line carrier and wireless these four kinds of passages, can adopt any one data transmission channel to realize exchanges data.The RS485 telecommunication circuit adopts special-purpose RS485 chip such as SN65LBC184, carries out exchanges data by serial data transmission mouthful RXD, the TXD connection RS485 chip and the outside of single-chip microcomputer; The carrier communication circuit adopts special carrier chip such as PL3201, and these two RXD by single-chip microcomputer, the TXD pin connects carrier chip and exchanges data is carried out in the outside; Radio communication circuit has then adopted the wireless communication module (also can adopt the Zigbee communication module of 2.4G frequency) of 517MHz or 433MHz frequency, controls and exchanges data is carried out in the outside by single-chip microcomputer RXD, TXD pin; The infrared communication circuit has adopted infrared receiving tube and infrared transmitting tube, and it utilizes the serial data of single-chip microcomputer to send the data transmit-receive of a mouthful TXD, RXD controlling and driving infrared receiving tube and infrared transmitting tube.

The utility model can be three-phase or single-phase table, and when being single-phase table, its electrical energy pulse Acquisition Circuit can adopt special-purpose single-phase computation chip such as ADE7755; When being three phase times, can adopt special-purpose three phase metering chip such as ADE7752, ADE7758 or SA9105F computation chip, sample respectively by voltage signal and current signal to power circuit, multiplier by chip internal calculates the electric energy consumption then, convert pulse signal to through A/D, output to single-chip microcomputer.

Described drawing lock control circuit, implementation method can be with the built-in single-phase or three-phase magnetic latching relay of electric energy meter, and single-chip microcomputer is by controlling the closed of this relay or disconnecting energising or the outage of controlling the subscriber's line phase line.Single-chip microcomputer utilizes two IO mouth controls to come the trigger relay action as BL8023 bidirectional relay drive IC or as ULN2003A relay drive IC.

As figure, the utility model also comprises the ESAM embedded safety module, power failure detection circuit, the electrical energy pulse test circuit that are used for the data of CPU card are carried out encryption and decryption that is connected with single-chip microcomputer.

Described ESAM (Embedded Secure Access Module) module can comprise microprocessor and the ROM storer that is connected with microprocessor, eeprom memory, DES/3DES accelerator, ACE superencipherment coprocessor etc.

The ESAM embedded safety module can adopt existing forming module; it supports the key management system of multistage dispersion; support standard DES and triple des algorithm also can support to comprise the file and the protection of cipher key operation communication line of plaintext, encryption and three kinds of modes of MAC according to the automatic selection algorithm of key length.

Power failure detection circuit by detect ammeter inner magnet guard relay output end voltage size, and then judge the working condition of drawing lock control circuit, guarantee reliably to operate a switch.The electrical energy pulse test circuit produces a default standard-frequency signal and gives single-chip microcomputer, is used for the error of verification electric energy metrical.

The utility model also comprises the indicator light circuit that is connected with single-chip microcomputer, comprises power light, communications status pilot lamp, pulse pilot lamp and drawing lock pilot lamp, and administrative authority and user can be got information about the working condition of ammeter.

Also comprise the infrared communication circuit that is connected with single-chip microcomputer as figure the utility model, convenient and ammeter carries out the field data transmission; Offer the clock circuit of single-chip microcomputer frequency of operation and time parameter, it can adopt real-time timepiece chip, and the inner integrated quartz oscillator of 32.768kHz, has simplified peripheral circuit, and can carry out as required freely being provided with to obtain higher frequency; Be integrated with clock and calendar counter simultaneously; Can select 24 or 12 hours display modes; Clock can carry out 30 seconds adjustment at interval by software mode; And provide the timing pip of 0.1Hz or 1024Hz to export, so that clock accuracy is made regular check in the outside of electric energy meter.

The utility model is directly from the power circuit power taking, and to single-chip microcomputer and the power supply of each functional circuit, other is provided with one road backup battery by No. one power circuit conversion back, to guarantee that when the grid power blackout, the clock circuit that offers the single-chip microcomputer time parameter can also normally move.

Claims

1, a kind of multi-functional prepayment meter comprises:

Governor circuit, it comprises the storer of single-chip microcomputer and storage single-chip microcomputer supplemental characteristic;

The electrical energy pulse Acquisition Circuit, the signal of its input end sampling power circuit, output terminal output electric energy measurement data is to single-chip microcomputer;

Drawing lock control circuit, its input end receives the outage control signal of single-chip microcomputer, and the relay of output terminal control ammeter inside and then control are communicated with electric line or disconnect;

Display circuit is directly driven by single-chip microcomputer, is used to show ammeter parameters data;

Power circuit is used to provide power supply to each functional circuit in single-chip microcomputer and the ammeter;

It is characterized in that: also comprise being connected being used for the data transfer circuit of upstream data collecting device communication and being used for carrying out the CPU card interface circuit that electric weight is supplemented with money to ammeter with single-chip microcomputer; Described data transfer circuit comprises at least two kinds in RS485 circuit, infrared circuit, electrical power carrier circuit and the radio-circuit, and described CPU card interface circuit adopts plug-in type IC-card interface circuit or frequency card type interface circuit.

2, multi-functional prepayment meter according to claim 1 is characterized in that: described RS485 channel can adopt integrated chip SN65LBC184, and this chip controls end sends mouthful RXD, a TXD with the serial data of single-chip microcomputer and is connected.

3, multi-functional prepayment meter according to claim 1, it is characterized in that: described carrier channel can adopt the PL3201 carrier chip, and this chip controls end sends mouthful RXD, a TXD with the serial data of single-chip microcomputer and is connected.

4, multi-functional prepayment meter according to claim 1, it is characterized in that: described radio-circuit can adopt the wireless communication module of 517MHz or 433MHz frequency; Perhaps, adopt the Zigbee communication module of 2.4G frequency.

5, according to each described multi-functional prepayment meter in the claim 1～4, it is characterized in that: this prepayment meter also comprises the ESAM embedded safety module that is used for the data of CPU card are carried out encryption and decryption that is connected with single-chip microcomputer.

6, according to each described multi-functional prepayment meter in the claim 1～4, it is characterized in that: this prepayment meter also comprises the power failure detection circuit that is used to detect ammeter internal relay output end voltage that is connected with single-chip microcomputer.

7, according to each described multi-functional prepayment meter in the claim 1～4, it is characterized in that: this prepayment meter also comprises the indicator light circuit that is connected with single-chip microcomputer, comprises power light, communications status pilot lamp, pulse pilot lamp, alarm lamp and drawing lock pilot lamp.