Real-time clock synchronous error-correcting method for charge-controlled intelligent electric energy meter

Abstract

The invention discloses a real-time clock synchronous error-correcting method for a charge-controlled intelligent electric energy meter, and relates to the technical field of electric energy metering instruments. The real-time clock synchronous error-correcting method comprises the following steps of creating an internal clock in a single chip microcomputer, and defining an array for storing an external clock; performing initial setting on the internal clock after the electric energy meter is electrified and started; generating a second signal through a timer, and adding one second onto the internal clock per second; whenever ten seconds are added onto the internal clock, sequentially performing check operation on the external clock and the internal clock, and performing corresponding synchronous error-correcting treatment on the abnormal clock. The real-time clock synchronous error-correcting method for the charge-controlled intelligent electric energy meter has the advantages that the anti-interference capability of the clock can be enhanced, the accuracy of the real-time clock in the electric energy meter is effectively guaranteed, and the effects of stability and reliability are achieved.

Description

technical field [0001] The invention relates to the technical field of electric energy metering instruments, in particular to a real-time clock synchronous error correction method for a fee-controlled intelligent electric energy meter. Background technique [0002] With the use of single-chip microcomputers and smart chips in electric energy meters, multi-functional cost-controlled intelligent electric energy meters have also been more and more widely used. Since some functions in the cost-controlled smart energy meter require the cooperation of the clock, such as time-of-use measurement, automatic electricity settlement, etc., these functions involve the electricity measurement and settlement of the energy meter, so accuracy is particularly important. The clock plays an important role in it, so it is necessary to ensure the accuracy of the clock. [0003] However, when the existing cost-controlled smart energy meters are running, they need to read the time data from the ex...

AI Technical Summary

Problems solved by technology

[0003] However, when the existing cost-controlled smart energy meters are running, they need to read the time data from the external clock chip in real time

In the frequent communication process, since the communication signal with the external clock chip is transmitted in the physical channel, the random noise caused by the electrical characteristics of the line itself, the attenuation of the signal amplitude, the distortion of the frequency and phase, and the reflection of the electrical signal on the line are caused. Echo effects, crosstalk between adjacent lines, and various other external factors (such as lightning in the atmosphere, flashover of switches, changes in external strong current magnetic fields, fluctuations in power supply, etc.) will cause signal distortion

This will make the binary digits received by the microcontroller inconsistent with the binary digits actually sent by the external clock chip, resulting in errors from "0" to "1" or from "1" to "0".

In this way, the accuracy of the real-time clock will be affected, thus affecting the normal use of functions such as metering and settlement of the fee-controlled smart energy meter

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