CN203503062U

CN203503062U - Electric energy meter

Info

Publication number: CN203503062U
Application number: CN201320664561.2U
Authority: CN
Inventors: 涂柏生; 朱锌铧; 周德贵
Original assignee: HUNAN JIUTIAN TECHNOLOGY Co Ltd
Current assignee: HUNAN JIUTIAN TECHNOLOGY Co Ltd
Priority date: 2013-10-25
Filing date: 2013-10-25
Publication date: 2014-03-26
Anticipated expiration: 2023-10-25

Abstract

The utility model provides an electric energy meter. The electric energy meter comprises a sampling module (100), a current measuring chip (200), an MCU single chip microcomputer (300) and an LCD display module (400), wherein the sampling module (100) is used for conducting sampling on a voltage and a current, the current measuring chip (200) is electrically connected with the sampling module (100) and used for processing voltage and current signals, the MCU single chip microcomputer (300) is electrically connected with the current measuring chip (200) and used for processing active power pulse signals generated by the current measuring chip (200), the LCD display module (400) is electrically connected with the MCU single chip microcomputer (300) and used for displaying electric energy data, and the MCU single chip microcomputer (300) comprises an EEPROM storage module (310). According to the electric energy meter, electric energy data are stored in real time within the range of the service life of the EEPROM storage module (310), the error correction capacity for reading the EEPROM storage module (310) is high, and the defect that the EEPROM storage module (310) cannot store or accurately read data in real time is overcome.

Description

A kind of electric energy meter

Technical field

The utility model relates to appliance field, relates in particular to a kind of electric energy meter.

Background technology

In prior art, the precision of electric energy meter is not only relevant with the precision of detection chip, and more important have much relations with its storage mode, if the electric quantity data detecting can not write reservoir or ablation process is made mistakes, can cause electrical energy meter accuracy greatly to reduce.The erasable number of times of the every byte of EEPROM memory module using in conventional electric energy meter is 1,000,000 times, and general electric energy meter 1 degree electricity 3200 pulses in location, if often carry out the just storage mode routinely EEPROM memory module of writing direct of a pulse, EEPROM memory module ratio is easier to damage, so current disposal route is by the SRAM storer of the temporary MCU single-chip microcomputer of each pulse, isopulse is metered into certain value (such as 1 degree electricity) or has arrived certain hour (such as 1 hour) and again data write to EEPROM memory module, but, because data can not write in real time, if met with while having a power failure, the electric weight that MCU single-chip microcomputer stores (in SRAM, why the electric weight of metering has 25060 pulses approximately 0.8 degree electricity) will be lost, if no matter system is power-down conditions, the precision of electric energy meter is very low so, and when data are in ablation process, meet with to have a power failure, data may not complete the loss that storage causes current electric quantity (0.8 degree), the possible write error data that situation is serious, and causing powers on again reads the serious consequence of wrong energy data.

The erasable number of times of the every byte of existing EEPROM memory module is 1,000,000 life-spans, and electric energy meter storage data amount is very large, storing frequencies is also very high, if user uses 31.25 degree electric energy (constant of electric energy meter according to 3200 calculates) just can reach 1,000,000 storage lifes of EEPROM, such product can not drop into practical application certainly.

Therefore, one of current disposal route is by the SRAM storer of the temporary MCU single-chip microcomputer of each pulse, and isopulse is metered into certain value (such as 1 degree electricity) or has arrived certain hour (such as 1 hour) and again data write to EEPROM memory module; And the content of storage data group and reading out data group does not comprise the check code of this energy data, once like this by accidental cause (as having a power failure suddenly or voltage instability in storage data process, as the bit of storage of certain address in EEPROM memory module is damaged) cause data storage or read error, the accuracy of electric energy metrical and precision just can not be protected completely.

Utility model content

In prior art, the energy data of electric energy meter can not store in real time, and power failure may cause electric energy meter loss of data, cause electric energy meter measuring accuracy hydraulic performance decline, error correction can not be strong not, and the defect that easily causes electric energy measurement data to be made mistakes the utility model proposes a kind of electric energy meter.

The technical scheme that the utility model solution prior art problem adopts is a kind of electric energy meter of structure, the electric current computation chip for the treatment of voltage and current signal that this electric energy meter comprises sampling module for electric current and voltage is sampled, be electrically connected with described sampling module, the MCU single-chip microcomputer for the treatment of the active power pulse signal being generated by described computation chip being electrically connected with described computation chip and with described MCU single-chip microcomputer be electrically connected for showing the LCD display module of energy data, wherein

Described MCU single-chip microcomputer comprises EEPROM memory module, described EEPROM memory module comprises energy data storage unit for storage of electrical energy data, for the umber of pulse storage unit of storage pulse number and find out maximum energy data for all energy datas in described energy data cell stores, and the energy data of described maximum is recorded as to the checking data storage unit of energy data.

Described sampling module comprises for to the resistor network of voltage sample and for the manganese copper diverter to current sample.

Described computation chip comprises for the current sampling data of the voltage sample data of resistor network generation and manganese copper diverter generation is processed to digital multiplier, low-pass filter, integrating circuit and the numerical frequency converter calculating.

Described MCU single-chip microcomputer also comprises for the computing module of metrical pulse and electric energy conversion, for driving described LCD display module to show the LCD driver module of energy data.

Described computing module is electrically connected with described EEPROM memory module and described LCD driver module respectively.

Implement electric energy meter of the present utility model, in EEPROM memory module real-time store electrical energy data within the scope of serviceable life, and it is strong to read the error correcting capability of EEPROM memory module, overcomes the EEPROM memory module shortcoming of storage data and accurate reading out data in real time.

Accompanying drawing explanation

Below in conjunction with drawings and Examples, the utility model is described in further detail, in accompanying drawing:

Fig. 1 is the structured flowchart of a kind of electric energy meter of providing of the utility model preferred embodiment;

Fig. 2 is the internal storage structure schematic diagram of the memory module of EEPROM shown in Fig. 1.

Embodiment

The structured flowchart of a kind of electric energy meter of providing of the utility model preferred embodiment as shown in Figure 1.This electric energy meter has the function in EEPROM memory module real-time store electrical energy data within the scope of 310 serviceable lifes, and have that to read the error correcting capability of EEPROM memory module 310 strong, storage data and the accurately feature of reading out data in real time in EEPROM memory module 310.

This electric energy meter comprises the sampling module 100 for electric current and voltage is sampled, the electric current computation chip 200 for the treatment of voltage and current signal being electrically connected with above-mentioned sampling module 100, the MCU single-chip microcomputer 300 for the treatment of the active power pulse signal being generated by above-mentioned computation chip 200 being electrically connected with above-mentioned computation chip 200 and with above-mentioned MCU single-chip microcomputer 300 be electrically connected for showing the LCD display module 400 of energy data.

In this electric energy meter, sampling module 100 comprises for the resistor network 110 to voltage sample and for the manganese copper diverter 120 to current sample.

When above-mentioned resistor network 110 completes respectively voltage sample and current sample with above-mentioned manganese copper diverter 120, and after formation voltage sampled data and current sampling data, computation chip 200 in this electric energy meter is processed calculating according to above-mentioned voltage sample data and current sampling data, by the processing of digital multiplier 210, low-pass filter 220, integrating circuit 230 and numerical frequency converter 240, generate active power pulse signal successively.

Above-mentioned active power pulse signal is transferred to after MCU single-chip microcomputer 300, by 320 pairs of active power pulse signals of computing module for metrical pulse and electric energy conversion in MCU single-chip microcomputer 300, carry out analyzing and processing, and result is transferred to the EEPROM memory module 310 in MCU single-chip microcomputer 300.This EEPROM memory module 310 comprises energy data storage unit 311 for storage of electrical energy data, for the umber of pulse storage unit 312 of storage pulse number and for finding out maximum energy data at all energy datas of described energy data storage unit 311 storages, and the energy data of described maximum is recorded as to the checking data storage unit 313 of energy data.

Meanwhile, this MCU single-chip microcomputer 300 also comprises for driving described LCD display module 400 to show the LCD driver module 330 of energy data.

When 300 pairs of active power pulse signals of MCU single-chip microcomputer complete after analyzing and processing, by above-mentioned LCD driver module 330, drive described LCD display module 400 to show energy data.

In order to overcome in prior art, electric energy meter is storage data and the accurate shortcoming of reading out data in real time, adopt 256KB to store the EEPROM memory module 310 of specification, with this, guarantee that Data Dynamic writes full energy data and surpass after 999999.9 degree electric energy, the erasable number of times of storage element of each EEPROM does not surpass 10,000,000,000.

Simultaneously, EEPROM memory module 310 adopts and encrypts, dynamic storing data processing: every group of storage data content comprises energy data, pulse data, also comprise the encryption/checking data of a byte, and write after one group of data, storing address increases by 6 byte addresses automatically; When 320 pairs of EEPROM memory modules 310 of computing module read, reading out data and corresponding encryption/checking data, and to calculate according to the algorithm of agreement the enciphered data that the enciphered data of these data relatively reads be equal, if unequal, illustrate that data have problem, and give up; If equate, 6 bytes of the automatic increase of reading address read next group, if lower group of data no problem regards those large group data as energy data, have read in this way the data of all groups of EEPROM memory module 310 the insides, and have obtained electric energy meter data.

This electric energy meter obtains the mode of electric energy meter data:

After this electric energy meter electrification reset, the energy data of storage before reading: first read the content in the address 0000-0005H of EEPROM memory module 310, and calculate the verification of 5 byte datas above and the data that whether read with the 6th byte equate, if equate, these group data are regarded to maximum power data temporarily; Next read the content in the address 0006H-000BH of EEPROM memory module 310, equally first confirm the verification of calculating and whether and the verification of reading and whether equating, if equal, compare second group of data and whether be greater than interim energy data; If be greater than interim energy data, second group of data regarded to interim energy data, if be less than interim energy data, give up this secondary data; And then read the 3rd group of data, in this way, until obtain maximum interim energy data, and these data are regarded to energy data.

In like manner known, when receiving a pulse signal, can directly to EEPROM memory module 310, store, storage format first sends 3 byte energy datas and 2 byte pulse numbers as shown in Figure 2, then according to this 5 byte data, calculate check data, and check data is stored in EEPROM memory module 310 as the 6th byte data; When receiving next pulse signal, first eeprom address is increased to 6 bytes, then store current group of 6 byte datas to EEPROM memory module 310, in this way, when storing address, EEPROM surpasses after 40000H, from 0000H, start storage data.

Implement electric energy meter of the present utility model, in EEPROM memory module real-time store electrical energy data within the scope of 310 serviceable lifes, and the error correcting capability that reads EEPROM memory module 310 is strong, EEPROM memory module 310 storage data and the accurate shortcoming of reading out data have in real time been overcome.

Should be understood that, for those of ordinary skills, can be improved according to the above description or convert, and all these improvement and conversion all should belong to the protection domain of the utility model claims.

Claims

1. an electric energy meter, it is characterized in that, the electric current computation chip (200) for the treatment of voltage and current signal that comprises sampling module (100) for electric current and voltage is sampled, is electrically connected with described sampling module (100), the MCU single-chip microcomputer (300) for the treatment of the active power pulse signal being generated by described computation chip (200) being electrically connected with described computation chip (200) and with described MCU single-chip microcomputer (300) be electrically connected for showing the LCD display module (400) of energy data, wherein

Described MCU single-chip microcomputer (300) comprises EEPROM memory module (310), described EEPROM memory module (310) comprise energy data storage unit (311) for storage of electrical energy data, for store described active power pulse signal umber of pulse umber of pulse storage unit (312) and for finding out maximum energy data at all energy datas of described energy data storage unit (311) storage, and the energy data of described maximum is recorded as to the checking data storage unit (313) of energy data.

2. electric energy meter according to claim 1, is characterized in that, described sampling module (100) comprises for to the resistor network of voltage sample (110) and for to the manganese copper diverter of current sample (120).

3. electric energy meter according to claim 2, it is characterized in that, described computation chip (200) comprises for the current sampling data of the voltage sample data of resistor network (100) generation and manganese copper diverter (120) generation is processed to digital multiplier (210), low-pass filter (220), integrating circuit (230) and the numerical frequency converter (240) calculating.

4. electric energy meter according to claim 3, it is characterized in that, described MCU single-chip microcomputer (300) also comprises for the computing module (320) of metrical pulse and electric energy conversion, for driving described LCD display module (400) to show the LCD driver module (330) of energy data.

5. electric energy meter according to claim 4, is characterized in that, described computing module (320) is electrically connected with described EEPROM memory module (310) and described LCD driver module (330) respectively.