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Hot plugging process

Hot plugging process
The hot-swap process is shown in the figure below. The left side represents the system and its power supply. There is a capacitor at the output of the power supply. There are two cards on the right side. The input terminals of these cards also have capacitors. Before the card is inserted into the system, the input capacitor is not charged; when the card is inserted into the system, there is a large instantaneous current charging the input capacitor. Such a large instantaneous current is likely to cause the system supply voltage to be abnormal.
The hot-swap implementation is shown in the figure below by connecting a MOS transistor and a current-sense resistor between the supply and the load. The purpose of the current detecting resistor is to transmit a signal flowing through the MOS tube to the control line, and the control line controls the conduction of the MOS tube according to the current setting and timing circuit.
Hot swap benefits
The benefits of adding hot plugging to your system include:
The damaged module is removed when the system is powered on, and can be updated or expanded without being affected by the system operation.
Due to the increased reliability of hot-swappable parts, they can also be used as breakers, and because hot-swap can be automatically recovered, there are many hot-swappable chips that provide signals for the system to provide power to the system for fault analysis. Reduced costs.

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