Protection circuit for interface signal hot-plug

A technology for protecting circuits and interface signals, which is applied in the field of communication and can solve problems such as no design scheme, high cost, and complicated design of hot-swapping technology

Inactive Publication Date: 2008-04-02
北京英华达电力电子工程科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are ready-made chips and solutions for the hot-swapping technology of the power supply. The number of interface signals cannot be predicted for sign...

Method used

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  • Protection circuit for interface signal hot-plug
  • Protection circuit for interface signal hot-plug

Examples

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Embodiment Construction

[0014] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0015] Fig. 1 is a schematic diagram of the connection relationship of an interface signal hot-swappable circuit in an embodiment of the present invention; Fig. 2 is a schematic diagram of the internal structure and truth table of a tri-state driver 74HC244 in an embodiment of the present invention, wherein L in the truth table Indicates low level low level, H indicates high level high level, Z indicates high impedance high impedance. In this embodiment, the three-state control chip must have a high-impedance state, specifically the three-state driver 1, the model is 74HC244. It can be seen from Figure 1 that pins 1 and 9 are cont...

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PUM

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Abstract

The invention relates to the communication field, in particular to an interface signal hot plug protective circuit, comprising a tristate control chip, a hot plug connecting piece, a hot plug control line and a pull-up resistor R1, wherein, a signal output pin of the tristate control chip is connected with a long needle in the hot plug connecting piece; a control pin of the tristate control chip is connected with one end of the hot plug control line; the other end of the hot plug control line is connected with the pull-up resistor R1 and a short needle in the hot plug connecting piece; the other end of the pull-up resistor R1 is connected with a 5V power source on an inserted module; the tristate control chip comprises high resistance state. The invention is capable of realizing hot plug of fault board on the premise that the power is not cut off, guarantees of normal operation of the device, improves working efficiency, and reduces the maintenance cost at the same time.

Description

technical field [0001] The invention relates to the communication field, in particular to an interface signal hot swap protection circuit. Background technique [0002] In some electronic systems, if there is a circuit board hardware failure or software failure, it is usually necessary to turn off the system power first and then repair or replace the faulty device. In some systems with very high reliability requirements, it is not allowed to shut down for maintenance and replacement For the faulty board, the faulty board must be hot-swapped at this time, but when the faulty board is hot-swapped, the power supply current spike will impact the hot-swapped device circuit, causing work confusion, reset, or even burning the circuit. , The level of the interface signal line will jitter when it is inserted, which will affect the normal operation of other working circuits in the entire system. Therefore, there must be a hot-swap protection circuit to ensure the normal operation of ...

Claims

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Application Information

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IPC IPC(8): H02H9/02H01R24/00H04B1/00
Inventor 严可国潘勇
Owner 北京英华达电力电子工程科技有限公司
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