Method for improving clock precision in electric energy meter

Abstract

The invention provides a method for improving clock precision in an electric energy meter. The method for improving the clock precision in the electric energy meter is achieved by arranging a TCXO crystal oscillating unit in a single chip microcomputer of the electric energy meter. The method for improving the clock precision in the electric energy meter comprises the first step that an RTC clock of the single chip microcomputer is configured through an outer RTC source or an inner RTC source; the second step that interruption function second pulse output is arranged on the TCXO crystal oscillating unit; the third step that the current time of the TCXO crystal oscillating is set; and the forth step that the current time is calculated through a counter in the single chip microcomputer.

Description

Technical field [0001] The invention involves a improved design of the electric energy meter clock system based on TCXO crystal. Background technique [0002] As an important function of the electronic intelligent power meter, clocks are very necessary to ensure the accuracy and security of the clock. The application for the creation of the present invention is a method of designing an electrical meter clock., Improved the reliability of the clock. [0003] At present, there are two main clocks used on our electrical meters, soft clocks and hard clocks.Soft clock: The so -called soft clock is the internal RTC clock of the STM32 single -chip microcontroller. Use an external 32.768kHz non -active crystal vibration as the clock base. Although it is the internal resources of the single -chip microcomputer, it is convenient and safe to use, but its accuracy is not very highEssenceHard clock: The so -called hard clock is the clock chip outside the single -chip microcomputer, such as DS...

AI Technical Summary

Problems solved by technology

Soft clock: The so-called soft clock is the internal RTC clock of the stm32 single-chip microcomputer, which uses an external 32.768KHz passive crystal oscillator as its clock reference. Although it is an internal resource of the single-chip microcomputer, it is very convenient and safe to use, but its accuracy is not very high

Hard clock: The so-called hard clock is the clock chip outside the microcontroller, such as DS3231, RX8025T, etc. Most of these clock chips have a built-in high-stability 32.768KHz crystal oscillator. Although the accuracy of the hard clock can be guaranteed, the system will be excessively occupied by real-time communication. resources, so the system clock cannot completely rely on the hard clock

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