Electric quantity data storage method for electric energy meter

Abstract

The invention relates to an electric quantity data storage method for an electric energy meter. The method is characterized by comparing a check code obtained through calculation with an initial check code pre-stored in a nonvolatile memory when the electric energy meter is energized; and when the electric energy meter is not energized, verifying and storing the current electric quantity data, and performing accumulative updating for the electric quantity data during the operation process of the electric energy meter, and also verifying the electric quantity data during every process for storing the updated electric quantity data, thus guaranteeing the accuracy of the electric quantity data. Besides, the electric quantity data storage method also utilizes the nonvolatile memory to store and back up the electric quantity data at regular intervals, thus preventing loss of data and being more reliable in storage.

Description

technical field [0001] The invention relates to the technical field of electric energy metering, in particular to a method for storing electric quantity data of an electric energy meter. Background technique [0002] The energy meter includes an MCU and a metering chip. The MCU obtains power data through the metering chip. In order to ensure that the power data is not lost, the power meter usually needs a non-volatile memory to store the power data. The existing power data storage method of the power meter is in the above When powering on, the MCU reads the current power data in its own RAM memory, calculates the check code based on the current power data, and compares whether the calculated check code is consistent with the initial check code stored in the non-volatile memory in advance. , it means that the energy meter is working normally. If it is not consistent, the power data will be restored from the non-volatile memory to the RAM memory of the MCU. When the energy me...

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Problems solved by technology

[0003] There are the following problems in the above-mentioned existing energy data storage method of the electric energy meter: only when the electric energy meter is powered on, the calculated check code is compared with the initial check code pre-stored in the non-volatile memory, and when the electric energy meter During the operation, only the power data is accumulated, and the check code is not calculated for the power data. The check code is only updated when the power is turned off. In this way, although the power is turned on and off normally, the calculated check code can be guaranteed to be equal to that stored in the non-volatile memory in advance. However, once the power meter resets abnormally, it is easy to store the wrong power data and check code in the non-volatile memory because the power level is very unstable, and at this time the RAM memory of the MCU The power data is also easily rewritten, resulting in the inconsistency between the check code calculated when the power is turned on again and the check code stored in the non-volatile memory in advance, data abnormality, and even the power data is directly reset to zero, resulting in serious inaccurate measurement , and because data backup is not performed during the operation of the energy meter, it is easy to cause data loss

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