Flash operation method suitable for intelligent electric meter load curve storage

Abstract

The invention discloses a flash operation method suitable for intelligent electric meter load curve storage, which realizes cyclic storage and data reading of load curve data in flash and data operation of forward time point modification by establishing a mirror image area, a data storage pointer and a data segmented cache. According to the invention, the design logic of the load curve applicationlayer is greatly simplified, the data loss caused by erasing the whole vector is avoided, the RAM overhead is reduced, the service life of the flash is prolonged, and the service life requirement iscompletely met under the extreme condition.

Description

technical field [0001] The invention relates to a flash operation method suitable for storing load curves of intelligent electric meters. Background technique [0002] With the promotion of smart meters, users have put forward higher and higher requirements for its functions. Load curve storage is a very common and very important function. The meter records the voltage, current, electricity and other information during the operation of the meter at a fixed interval (such as 1 minute, 5 minutes, 10 minutes, etc.), and then draws these information into a load curve in chronological order. [0003] The storage space occupied by the load curve is very large. Assuming that the load information is recorded every 15 minutes, more than 1M space is required to record 90 days of data. Therefore, flash is generally used as a storage device for load curves in the design of smart meters. [0004] The erasing operation of flash is generally carried out according to the sector, that is,...

AI Technical Summary

Problems solved by technology

[0007] 1) When the load curve data is cyclically stored, the data of the entire sector will be erased each time it is erased, resulting in data loss;

[0008] 2) If the user modifies the time of the smart meter forward, a sector-sized RAM area (generally 4K bytes) needs to be opened in the single-chip microcomputer of the smart meter to cache the data in the sector where the time point to be modified is located. In the opened cache area, the data before the modified time point is retained, the data after the time point is cleared, and then the data is written back to the corresponding sector. This is a huge overhead for single-chip microcomputers with small RAM, such as 51 series single-chip microcomputers.

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