Clock synchronization circuit applied to DCS (distributed control systems)
A clock synchronization and circuit technology, applied in electrical components, multiplexing communication, time division multiplexing systems, etc., can solve the problems of high clock synchronization cost, unsuitable for popularization and low precision, etc.
Active Publication Date: 2013-03-13
HANGZHOU DIANZI UNIV
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[0003] The present invention is a real-time precise clock synchronization circuit proposed for the high cost of clock synchronization in the current distributed network system, relatively low precision and unsuitable for popularization and use.
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[0020] The present invention will be further described below in conjunction with the accompanying drawings.
[0021] Such as figure 1 As shown, the present invention includes a power management module 1 , a communication module 2 and a control module 3 . Each module adopts the existing mature technology, among which, the power management module is a 3.3V voltage conversion circuit with AMS1117 as the core, and the communication module 2 includes serial communication module 2-1, JTAG interface 2-2 and Ethernet interface module 2-3 , the 3.3V voltage conversion circuit with AMS1117 as the core provides 3.3V voltage for the RS232 interface 2-1, JTAG interface 2-2 and RJ45 network port 2-3 in the communication module. The RS232 interface and the JTAG interface in the communication module 2 are used to transmit data with an external computer, and the RJ45 interface is used to transmit data with other network nodes.
[0022] The working process of the clock synchronization system ...
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The invention discloses a clock synchronization circuit applied to DSC (distributed control systems). The clock synchronization circuit comprises a power module, a communication module and a control module, wherein the power module is mainly a 3.3V voltage conversion circuit taking a power management chip AMS1117 as a core, and the communication module consists of a serial network communication module, a JTAG interface and an Ethernet communication module; 3.3V voltage is provided via the JTAG interface, the Ethernet communication module and the serial network communication module in the communication module by taking the 3.3V voltage conversion circuit taking a voltage conversion chip AMS1117 as a core as a control module; and the RS232 interface and the JTAG interface in the communication module are used for data transmission with external computers, and the RJ45 interface is used for data transmission among distributed systems. The clock synchronization circuit is low in circuit power consumption, high in precision and applicable to precise clock synchronization of an industrial field.
Description
technical field [0001] The invention belongs to the technical field of industrial control and relates to a clock synchronization circuit applied to DCS. Background technique [0002] In the field of industrial control, more and more application systems are built in a distributed network environment, but as the scope of the system becomes larger, in view of the need for real-time scheduling control, time synchronization between control nodes becomes more and more important . The current NTP (Network Time Protocol) and SNTP (Simple Network Time Protocol) can no longer meet the synchronization accuracy required by industrial systems. At present, most of the communication devices used by the public use software to add time stamps in terms of clock synchronization. In this way, the execution of programs and the transmission between network layers will affect the synchronization accuracy of the upper and lower computers. At the end of 2002, the IEEE Standards Committee passed th...
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Inventor 孔亚广孙祥祥薛安克徐哲
Owner HANGZHOU DIANZI UNIV