Protection system for foreign exchange office

A technology of external switching office and protection system, applied in the direction of telephone communication, relay circuit, electrical components, etc., can solve the problem of power line lapping and V/I performance curve poor performance, difficult to meet surge protection and power line induction And other issues

Active Publication Date: 2016-12-07
SHENZHEN GONGJIN ELECTRONICS CO LTD
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Problems solved by technology

The existing interface protection technology of external switching office cannot meet the requirements of surge...

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  • Protection system for foreign exchange office
  • Protection system for foreign exchange office

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Embodiment Construction

[0034] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the associated drawings. Preferred embodiments of the invention are shown in the accompanying drawings. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0035] It should be noted that when an element is referred to as being “fixed” to another element, it can be directly on the other element or there can also be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and similar expressions are used herein for purposes ...

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Abstract

The invention relates to a protection system for a foreign exchange office. Voltage division is carried out when outside continuous high voltage appears on the protection system; a first-level surge protection module is adopted to bleed outside instant high voltage interference emerging in the protection system; a difference mode filtering module and a common mode filtering module are adopted to carry out difference mode filtering and common mode filtering on output signals of the foreign exchange office; finally a rectifier module converts the alternating-current signals into direct-current signals for work of a backward stage circuit. Most voltage of the whole circuit can be divided by adopting a current limiting module, and the first-level surge protection module bleeds surge high pressure in the circuit. The anti-interference capacity of the circuit can be improved, and the requirement for 4-level surge protection is met. After difference mode filtering and common mode filtering, it can be ensured that the power curve of the output signals meets the requirement, and good radiation performance is achieved.

Description

technical field [0001] The invention relates to protection circuits, in particular to a protection system for external exchanges. Background technique [0002] FXO (Foreign Exchange Office, foreign exchange office), simple understanding, it is the interface used to connect with the public telephone network on the PBX (PrivateBranch Exchange, user-level switchboard). That is, a trunk-side connection between the central office switch and the digital telephone switching system. Compared with the central office, it simulates a PABX extension, which can realize the connection between an ordinary telephone set and a multiplexer. The existing external exchange interface protection technology cannot meet the requirements of surge protection and power line induction, and the performance of power line lapping and V / I performance curve is not good. Contents of the invention [0003] Based on this, it is necessary to provide a protection system for external exchanges with strong ant...

Claims

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Application Information

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IPC IPC(8): H04M7/00
CPCH04M7/009H04M7/0096
Inventor 张绪坤刘圣文吴奎元袁庆壮汪火根连铭仁
Owner SHENZHEN GONGJIN ELECTRONICS CO LTD
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