Automatic device high-precision time keeping method

An automatic device, high-precision technology, applied in clocks driven by synchronous motors, electronic timers, electromechanical clocks, etc., can solve problems such as reducing operating efficiency, increasing CPU load, and large frequency deviation, reducing production costs, The effect of improving punctuality accuracy

Active Publication Date: 2016-11-23
NANJING GUODIAN NANZI POWER GRID AUTOMATION CO LTD
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Problems solved by technology

Solution C directly uses the CPU to interpolate and smooth the main frequency clock for compensation. Since the CPU main frequency uses an ordinary crystal oscillator, the freq

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  • Automatic device high-precision time keeping method
  • Automatic device high-precision time keeping method

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Embodiment Construction

[0026] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0027] The technical problem to be solved by the present invention is after the external GPS timing pulse is lost, how to carry out the system timekeeping with high precision, the specific realization principle is as follows:

[0028] see Figure 4 , FPGA counts the 32.768kHz pulse of RTC, counting from 0 to 32767 is 1s, then FPGA A generates an interrupt request Irq to the CPU, and the CPU records its own counter value in the interrupt (in I.MAX6, use 64bit Timebase value), and then interpolate the counter to smoothly record the time deviation from the CPU interrupt to the reading of the FPGA time information, and calculate the phase relationship between the CPU count value and the 32.768kHz of the RTC, so as to achieve the frequency synchronizat...

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Abstract

The invention discloses an automatic device high-precision time keeping method. The automatic device high-precision time keeping method specifically includes the following steps that when an FPGA has GPS timing pulses, RTC pulses are subjected to frequency and phase correction; the corrected RTC pulses are used for counting to generate an interrupt signal with synchronous GPS timing frequency and phases, and a CPU carries out interpolation smoothing on an internal counter after receiving an interrupt request to obtain accurate nanosecond time information; after the GPS timing pulses are lost, the CPU carries out system time keeping through the time information obtained after interpolation smoothing. On the basis of not changing original RTC circuit topology, the RTC pulses are used for time keeping, and the requirements of a power station secondary automatic equipment device on time keeping precision can be met while the design cost is reduced.

Description

technical field [0001] The invention relates to a high-precision timekeeping method for an automatic device (automatic equipment such as a microcomputer protection device, a fault recording device, a data concentrator device, and an electric energy metering device), and belongs to the technical field of electric power system automation. Background technique [0002] Most of the power stations now use automation devices, microcomputer protection devices, fault recording devices, electric energy metering devices, computer monitoring systems, etc. from different manufacturers. With the deepening of the construction of intelligent substations, there are further requirements for the time accuracy index of intelligent automation devices. For example, the wave recording device and the data concentrator device can meet the synchronization accuracy requirement of ±1s at least within 24 hours after the external synchronization signal disappears. This requires that the secondary autom...

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Application Information

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IPC IPC(8): G04G7/00
CPCG04G7/00
Inventor 陈新之叶品勇韩春江陈庆旭潘可霍银龙
Owner NANJING GUODIAN NANZI POWER GRID AUTOMATION CO LTD
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