Intelligent railway signal power source switching module

Abstract

An intelligent power supply switching module for the railway signalling can automatically perform the switching between two power supplys when the undervoltage, overvoltage, or phase lost occurs. It is composed of primary circuit, the overvoltage, undervoltage and phase lost detector, switching circuit and drive circuit. Its primary circuit has two input power supplys and a switch circuit consisting of serially or parallelly connected two IGBTs for output. Its advantages are high detecting and switching speed (less than 2 ms).

Description

technical field [0001] The invention relates to the technical field of railway traffic management and guaranteeing railway traffic safety, in particular to the technical field of automatic switching of railway signal dual-way power supplies. Background technique [0002] The intelligent power supply panel for the centralized power supply of Railway Electric is used to provide AC and DC power supplies for signal flashing power supply, track circuit, electric switch machine, centralized dispatching, microcomputer interlocking, relays, consoles and display panels, in order to ensure railway transportation Safety, the external grid power supply must be powered by two power sources, so it is necessary to have a two-way power switching device, which is used to switch to another power supply in a very short time when one power supply fails or when a certain power supply is routinely overhauled To ensure the normal power supply of the smart power panel, the standard switching time e...

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Problems solved by technology

[0002] The intelligent power supply panel for the centralized power supply of Railway Electric is used to provide AC and DC power supplies for signal flashing power supply, track circuit, electric switch machine, centralized dispatching, microcomputer interlocking, relays, consoles and display panels, in order to ensure railway transportation Safety, the external grid power supply must be powered by two power sources, so it is necessary to have a two-way power switching device, which is used to switch to another power supply in a very short time when one power supply fails or when a certain power supply is routinely overhauled To ensure the normal power supply of the smart power panel, the standard switching time established by the Ministry of Railways is 150ms, and the ideal state should be zero-time switching; most of the existing two-way power switching is achieved by mechanical contactors. On the one hand, it is difficult for the contactor to achieve switching with a switching time of less than 40ms. On the other hand, because of the frequent occurrence of failures such as coil burnout, contact bonding, and mechanical jamming during operation, the power failure accident at the signal point has seriously interfered with the normal operation. Driving order; for solving the above problems, China's utility model patent discloses a "dual-way power supply automatic switching solid-state controller" (patent number: 02204997.5), which consists of main road and backup road input circuit, rectification absorption circuit, DC excitation circuit, Composed of a controlled power switch circuit and a switching control circuit, the switching time is 20-30ms. Although it can meet the requirements of the Ministry of Railways for a switching time of less than 150ms, there is still a big gap with the ideal zero-time switching

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