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Synchronous and in-time self-tracking self-compensation method

A self-compensation and self-tracking technology, applied in pulse generation, electrical components, and electrical pulse generation, etc., can solve problems such as inability to guarantee accuracy requirements, synchronous pulse divisibility, and high punctuality accuracy, which is beneficial to large-scale applications and ensures correctness. , the effect of strong anti-interference ability

Inactive Publication Date: 2010-10-13
INTEGRATED ELECTRONICS SYST LAB
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Problems solved by technology

[0003] However, in most designs at present, since the synchronization pulse cannot be divisible by the number of sampling points, a large accumulated error is caused, and the accuracy requirement cannot be guaranteed. Moreover, after the synchronization pulse disappears, due to the discreteness of the crystal oscillator and temperature changes, it is impossible to maintain a relatively high frequency. High time keeping accuracy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0018] A synchronous time-keeping self-tracking and self-compensation method includes a self-tracking step and a self-compensating step.

[0019] When there is an external signal, such as GPS or IRIG-B, the reference clock data acquisition module receives the external signal, and digitizes the received signal, and at the same time performs advanced fault-tolerant judgment on the external input synchronization signal; specifically, first The falling edge of the external input signal is collected, and the absolute time scale of the falling edge change is recorded; secondly, when there are two edges, it is judged whether the time interval between the two edges is a unit time; if it is a unit time, according to the second The first edge generates the third edge through the hardware to prevent possible problems with the external third edge, that is, to perform advanced fault-tolerant judgment on the externally input synchronization signal.

[0020] If the above judgment is correct,...

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Abstract

The invention discloses a synchronous and in-time self-tracking self-compensation method, which is characterized by comprising the following steps that: 1) a reference clock data acquisition module receives an external signal, digitalizes the received signal and simultaneously performs advanced fault tolerance judgment on an externally input synchronization signal; 2) if the externally input synchronization signal is judged to be correct, the reference clock acquisition module generates a corresponding internal pulse and acquires and stores crystal oscillation signals at different temperatures; 3) the reference clock acquisition module performs signal decomposition at an equal interval according to an acquired current value and a sampling interval, divides the number of sampling points ina unit time by the current value, and uniformly distributes a remainder into the sampling interval as a synchronous sampling pulse; and 4) after the step 3) is finished and when external reference time input is invalid, stored reference information is extracted according to temperature information.

Description

technical field [0001] The invention relates to a self-tracking and self-compensating method for synchronous timekeeping. Background technique [0002] In equipment that needs timekeeping, such as MU (merging unit) or IED equipment (measurement, control and protection device) of the smart grid, in our current time synchronization scheme design, it is required that the device or external equipment accept synchronous clock calibration (such as Beidou signal or GPS second pulse input signal), and according to the input synchronous pulse, it is equally divided according to the required number of sampling points, and the synchronous sampling pulse is issued to ensure the time synchronization and punctuality accuracy between devices (or between devices). The sampling pulse synchronization error between the realization devices should not be greater than 1us. After the input sync pulse disappears, the IED or MU should be able to maintain a high timing accuracy. [0003] However, i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K3/011
Inventor 滕兆宏曹刚杜肖功魏欣薛海军
Owner INTEGRATED ELECTRONICS SYST LAB
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