Hot plug method and hot plug circuit suitable for heavy working current

Abstract

The invention discloses a hot plug method suitable for heavy working current, which comprises the steps that a device is split into a key circuit and a secondary circuit; real-time current flowing through the key circuit of the device is acquired; the real-time current is compared with a preset value; when the real-time current is greater than the preset value, a switch control signal is generated, and the key circuit and the secondary circuit of the device are turned off; and if the real-time current is less than the preset value, the switch control signal is released, and the key circuit and the secondary circuit of the device are triggered to work synchronously. According to the hot plug method, the device is split into the key circuit and the secondary circuit, so that hot plug can be performed on the device safely under the heavy working current. The invention further discloses a hot plug circuit suitable for the heavy working current.

Description

technical field [0001] The invention relates to the technical field of hot plugging, and more specifically relates to a hot plugging method and circuit suitable for large operating current. Background technique [0002] Hot-swapping, that is, hot-swapping, allows users to take out or replace damaged hard drives, power supplies, or a single board in the system without shutting down the system or cutting off the power supply, thereby improving the system's ability to recover from disasters in a timely manner and system scalability and flexibility. [0003] When replacing or installing a new hard disk, power supply or single board, the entire working system cannot be completely powered off, so it is necessary to plug and unplug the hard disk, power supply or single board while the power is on. Take the live plugging and unplugging of a single board as an example. For example, figure 1 As shown, the dotted line box indicates the backplane, the backplane is connected to the pow...

AI Technical Summary

Problems solved by technology

[0007] A general hot-swap circuit is composed of an integrated IC chip and its peripheral circuits. The value of U is limited by the process of the IC chip itself, and most of the value ranges from 50 to 100mV. When the current threshold is 1A, the value of Rs ranges from 50 to 100mΩ. Resistance values ​​in this range are more common, and hot-swappable circuits of this specification are easier to implement. However, when the current of the circuit exceeds 10A during normal operation, the current threshold should exceed 10A to ensure the normal use of the circuit. At this time, the value range of Rs will be changed to 5. ~10mΩ, the resistance value in this range is expensive, and the PCB board wiring itself also has a certain resistance value (mΩ level). It can be seen that to realize this specification of hot-swappable circuits not only need expensive high-precision low-resistance resistors but also Additional considerations should be taken during PCB layout and wiring, and the trace resistance between the hot-swap circuit and Rs should be kept as small as possible to prevent the hot-swap threshold current from deviating from the set value

[0008] From the above analysis, it can be seen that using the above-mentioned design to realize the hot-swap function under high-current conditions puts forward very high requirements in terms of cost and PCB technology, and the above-mentioned requirements cannot be realized in many cases.

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