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A real-time clock calibration method

A calibration method and real-time clock technology, applied in clocks, electronic timers, changing time indications, etc., to achieve the effects of easy implementation, reduced number of clock adjustments, and simple algorithms

Active Publication Date: 2016-05-25
HUIZHOU DESAY SV AUTOMOTIVE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the defects of existing time calibration, the present invention provides a solution for real-time clock calibration

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0012] In order to allow those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described below.

[0013] The invention discloses a real-time clock calibration method. First set a default compensation parameter N, the compensation parameter N is an offset, such as 10ppm (PartsPerMillion, that is, parts per million), and record the time T when the clock is used for the first time or after the last external adjustment and setting of the clock . And use the compensation parameter N to adjust the clock in real time.

[0014] If the clock is adjusted and set externally (manual operation, etc.), record the time parameters of the clock when the clock is adjusted and set, including the time T1 for compensation and adjustment using the compensation parameter N when the external adjustment and setting of the clock is completed. The time T2 for compensation adjustment using the compensation parameter N, and ...

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PUM

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Abstract

The invention discloses a calibration method of a real-time clock, which comprises the following steps: (1) a default compensation parameter N is set, and time T of the clock used for the first time or the time T of the clock adjusted and set for the last time is recorded; (2) if the clock is adjusted and set, a time parameter of the clock during the adjustment and setting of the clock is recorded, and if not, the operation goes to step (4); (3) a corrected parameter is calculated according to the obtained time parameter in the step (2), and is used for correcting the N; and (4) the clock is timely adjusted according to the compensation parameter N. The method has the advantages that the relatively higher accuracy of the clock can be kept during the use of the clock in normal environment or certain special environment for long time; the times of adjusting the clock are reduced; the general application requirements are satisfied; the algorithm is simple; and the operation of calibration is easy to realize.

Description

technical field [0001] The invention relates to a real-time clock calibration method. Background technique [0002] In electronic products, many products have a real-time clock display function, so how to ensure the accuracy of the real-time clock display? Generally, there are two methods as follows. [0003] The first is to calibrate the time through communication, such as GPS and radio wave communication to calibrate the local time. This method is generally used in occasions that require very high clock accuracy, and the cost is very high. It is not suitable for general consumption or occasions that only require general clock accuracy. [0004] The second method is to use the local crystal oscillator as the clock source to display the real-time clock, and the crystal oscillator is used as the clock source. Generally, the crystal oscillator will be affected by some environmental factors such as temperature, humidity, and aging. As the use time becomes longer, It will be ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G04G5/00
Inventor 李端阳杨进超
Owner HUIZHOU DESAY SV AUTOMOTIVE