Method and device for data storage

Abstract

The invention provides a method and device for data storage. The method and device are applied to the situation that a power failure happens when measurement is conducted through a flow meter. The method includes the steps of firstly, obtaining the voltage value of a power supply; secondly, monitoring whether the voltage value is lower than a preset voltage alarm value or not in real time; thirdly, when the voltage value is lower than the preset voltage alarm value, decreasing the working frequency of a controller in the flow meter, sequentially switching off switches of a converter and a field programmable gate array, and stopping supplying power to the converter and the field programmable gate array; fourthly, sending measurement data to a memorizer to be stored. Whether a power failure happens to an external power supply of the flow meter or not is monitored in real time, when a power failure happens to the flow meter, the working frequency of the controller in the flow meter is decreased, the converter and the field programmable gate array are powered off, and therefore it is ensured that when the controller has insufficient electricity, measurement data are completely written into the memorizer, and the data storage capacity of the flow meter is improved.

Description

technical field [0001] The invention relates to the technical field of data storage, in particular to a method and device for data storage in the case of power failure of a flowmeter during measurement. Background technique [0002] A flowmeter refers to an instrument that measures the flow rate and / or the total amount of fluid within a selected time interval. In simple terms, it is an instrument used to measure the flow of fluid in pipelines or open channels, and the engineering unit is m 3 / h. It can be divided into instantaneous flow rate (FlowRate) and cumulative flow rate (TotalFlow). The instantaneous flow rate is the amount that passes through the effective cross-section of a closed pipe or open channel per unit time. The material that flows through can be gas, liquid, or solid; The cumulative amount of fluid flowing through the effective cross-section of a closed pipe or open channel within a period of time (one day, one week, one month, one year). [0003] Howeve...

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Problems solved by technology

[0003] However, when the existing flowmeter is measuring the object under test, when it is powered off, the operating voltage of the EEPROM is too low due to the large current consumption of the flowmeter as a whole, and it is too late to completely write the measurement data to the external memory. EPPROM, resulting in the loss of metering data storage of the flowmeter; at the same time, in the process of writing to the EEPROM, due to the limit of the number of writes to the EEPROM, it cannot be written at any time, and the metering data is only allowed to be written by the controller when the power is off.

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