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Intelligent ammeter clock calibration method

A clock calibration, smart meter technology, applied in electronic timers, clocks, timing pulses, etc., can solve problems such as increasing procurement difficulty and raw material costs, to prevent temporary unreliability, high precision, and solve the impact of clock timing errors Effect

Active Publication Date: 2013-06-26
HEXING ELECTRICAL
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Problems solved by technology

However, for high-volume production needs, it increases the difficulty of procurement and the cost of raw materials

Method used

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Embodiment Construction

[0021] The perpetual calendar clock system counts and accumulates according to the 60-base system of time through the 1Hz second-based signal, so the accuracy of timekeeping, fast walking and slow walking are directly related to the accuracy and stability of the 1Hz second-based signal. In the electronic system, the watch crystal is usually used as the oscillator (32768Hz), and then the 1Hz second base signal is obtained through 32768 times of frequency division. In the process of signal frequency division, due to the use of high-speed semiconductor devices, almost no delay error is introduced, so in the end The source of the daily timing error mainly depends on whether the oscillation frequency of the watch crystal oscillator is accurate and stable.

[0022] For crystals, the frequency is most obviously affected by temperature, and presents a quadratic function relationship between frequency deviation and temperature. The long-term crystal application experience shows that th...

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Abstract

The invention relates to an intelligent ammeter clock calibration method aims at utilizing conventional resources of a single chip microcomputer to realize wide-range high-precision error correction. The technical scheme includes: a, measuring frequency deviation values of different temperature points, and simulating a temperature-frequency deviation curve; b, determining a minimum correction value of coarse tuning, and utilizing a formula obtained in step a to calculate out frequency deviation at current temperature as a compensation value; c, if the compensation value is smaller than the minimum correction value of the coarse tuning, executing step g, or executing step d; d, if M is 2, 3, 4 or 5, executing step e, or executing step f; e, using an internal pulse counter to perform pulse counting to signals output by a crystal oscillator, coarse tuning, and executing step g; f, performing frequency multiplication or frequency demultiplication to the signals output by the crystal oscillator to obtain a signal Ft; and g, arranging a controllable capacitor array at an output end of the crystal oscillator.

Description

technical field [0001] The invention relates to a clock deviation correction method, in particular to a smart meter clock calibration method, which is mainly applicable to a perpetual calendar clock system based on an internal timer of a single-chip microcomputer. Background technique [0002] With the development of science and technology and the progress of society, higher requirements are put forward for instruments and equipment, and the application of intelligent instruments and meters is born. Intelligent instruments and meters must include a perpetual calendar clock system. At present, the high-precision perpetual calendar clock system mainly uses ASICs to meet the design requirements of intelligent instruments, such as RX8025 (T) in Japan and DS3231 in the United States. However, it increases procurement difficulty and raw material costs for mass production needs. To this end, based on the high-precision perpetual calendar clock system of the general-purpose timer o...

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Application Information

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IPC IPC(8): G04G3/00G04G3/04G04G5/00G01R35/04
Inventor 周良璋舒元康郑有波
Owner HEXING ELECTRICAL
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