A safe lightning protection module

Abstract

The invention provides a security lightning protection module, and relates to a security lightning protection module applied in railway signal system lightning protection. In order to overcome defects in the prior art that a lightning protection module has short circuit after breaking down, the security lightning protection module comprises a housing, a bottom board, and more than one group of lightning protection circuits. Each group of the lightning protection circuit is respectively arranged on an inner cover. Two ends of a trip connecting piece are respectively welded with one electrode of a piezoresistor and one electrode of a discharge tube by a low-temperature soldering-tin material. A spring is arranged between the inner cover and the discharge tube. When the lightning protection module has faults, a failure mode of the module is in a high impedance state, the module performs full lightning protection on a protected circuit and a device thereof, and protects the lightning protection circuit from short circuit faults. The module is high in security, and is especially suitable to be used in the field of railway signal lightning protection. After the module has faults, normal operation of a signal circuit and the device thereof is not influenced.

Description

technical field [0001] The invention relates to a lightning protection module, in particular to a safe lightning protection module used for lightning protection of railway signal systems. Background technique [0002] Today, electronic equipment has higher and higher requirements for lightning or surge protection. The lightning protection module is usually used to protect electronic equipment and its signal system, and has achieved a certain lightning protection effect. The discharge tube and or varistor are usually used as the core components of the lightning protection module in the lightning protection module, but the varistor usually deteriorates gradually with time, and the degraded varistor is usually in short-circuit mode; the discharge tube is damaged due to various factors , may also cause a short circuit after damage. The short circuit of the lightning protection device in the lightning protection module will connect the protected equipment to the ground, resulti...

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Problems solved by technology

Therefore, the lightning protection module used for the protection of the railway signal system is also required to be able to fall to the safe side after a failure, that is, the lightning protection module must be in an open circuit mode after a failure, so as to avoid connecting the signal to the ground and causing the fault to escalate, preventing the lightning protection module The failure affects the normal operation of the signal equipment and affects the train operation

Although the lightning protection module of the prior art adopts some failure follow-up guarantee methods, there are still cases where the lightning protection module fails to cause the train to run. Currently, there is a lack of a safe lightning protection module that does not affect the train after a failure occurs. run

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