Method for implementing high-performance clock system in telemechanical device

A telecontrol device and clock system technology, applied in the direction of generating/distributing signals, etc., can solve the problem of only tens of pp, and achieve the effect of improving accuracy and resolution, and precise clock service

Active Publication Date: 2011-04-13
GUODIAN NANJING AUTOMATION
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Problems solved by technology

In terms of the clock system of the telecontrol devices commonly used at present, affected by the interrupt service time of the respective system clocks, the clock resolution that can be obtained can only reach the order of milliseconds or even 10 milliseconds, and the clock accuracy is not connected to the external In the case of timing signals, it is often only a few tens of ppm

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  • Method for implementing high-performance clock system in telemechanical device
  • Method for implementing high-performance clock system in telemechanical device

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Embodiment Construction

[0015] The present invention as shown in FIG. 1 provides a reliable method for realizing a high-precision and high-resolution clock suitable for telecontrol devices. The method includes the following steps:

[0016] 1, in the present invention, when designing telecontrol device embedded system, adopted PowerPC series MPC8247CPU, and RTC clock chip DS3231. The DS3231 clock chip used in this system has an accuracy of 2ppm because it integrates a temperature-compensated crystal oscillator (TCXO), and it also has a 32kHz pulse output signal. Therefore, in order to obtain a high-resolution and high-precision clock signal during system operation, we connect the 32KHz pulse output signal of DS3231 to a CLOCK input pin of the CPU. In this way, a 16-bit register can be used to save the value, and every time the value increases by 1, it represents the elapse of time (1000000 / 32K≈31) microseconds; at the same time, the 32KHz pulse signal is also used to drive another 32-bit register, so...

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Abstract

The invention relates to a realization method of a high precision and high resolution clock in remote control device, belonging to the automation manufacturing technical field of electric power system. The invention adopts a high precision clock chip on the hardware to produce a high frequency impulse output signal to drive a counter, the reading of the counter stands for an absolute time; on thesoftware, aiming at the absolute time characterized by the counter and depending on the way of respectively calculating the relative time difference, a plurality of sets of clocks are realized. The invention has the advantages that the precision of the clock of the device reaches 2 ppm; the resolution ratio reaches 31Mus, and thus the requirements of a power automatic system to the clock can be fully met.

Description

technical field [0001] The invention relates to a method for realizing a high-precision and high-resolution clock in a telecontrol device. The invention belongs to the technical field of power system automation manufacturing. Background technique [0002] The telecontrol device mainly realizes the forwarding function of data information between the power system plant automation system and remote dispatching. At the dispatching end, in order to ensure the uniformity of the information sending time of each plant station under its jurisdiction, the dispatching system often needs to issue a unified clock time synchronization command to the remote control device of each plant station, and the remote control device of each station is responsible for sending the time synchronization command to the station's The intelligent electronic device performs time synchronization, or converts the local time of the slave station into the time of the master station. Therefore, the quality of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F1/04G06F1/06G06F1/12
Inventor 胡道徐佘登明丁泉
Owner GUODIAN NANJING AUTOMATION
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