Hot plugging (hot plugging or hot swap), that is, hot plugging, refers to the technology of connecting or removing the equipment board or module from the working system without affecting the system operation. According to the degree of influence on devices and signals when the circuit is plugged in and out, the protection design of live plugging can be divided into four levels.
Level 1.0 protection
The circuit board with Class 0 protection design can be safely plugged and unplugged with power only when the main power supply is turned off. It has no suppression and protection of transient current or sudden voltage, and the circuit board interface cannot enter the high resistance state during plugging. If the circuit board is plugged in and unplugged with power when the system is not powered off, the interface devices or other components on the board are likely to be damaged. The circuit board that can only reach the level 0 protection design cannot be plugged or unplugged with power.
Class 2.1 protection (Partial Power Down)
The circuit board with Level 1 protection design can limit the current between the live bus and the interface of the plug-in circuit board in case of power failure, so as to prevent the plug-in circuit board from being damaged. This transient current limit can ensure that the circuit board can be plugged and unplugged without interrupting the main power supply, but the main system must suspend signal transmission during the plugging and unplugging.
Level 3.2 protection (Hot Insertion)
The circuit board with the level 2 protection design has the live plugging performance, which can prevent the drive conflict when inserting the circuit board. In addition to the ability of Level 1 protection design, Level 2 protection design can also maintain the high resistance state at the signal end before the power supply voltage rises to the specified value, and will output according to the set state after the power supply voltage exceeds the specified value.
Level 4.3 protection (Live Insertion)
The circuit board with three-level protection design has no other restrictions, restrictions and requirements on the system power supply and signal when it is plugged in and out. Live plugging and data exchange can be carried out synchronously, that is, plugging and unplugging operations under any circumstances will not damage data, and of course will not damage devices.
At present, connectors that support hot-swapping basically follow the design method of "on first and then off". The power-off sequence of different terminals is controlled by different terminal lengths to achieve convenient hot-swap function. TXGA is one of the leading domestic connector manufacturers with professional and mature production process. You only need to put forward the final application requirements and budget, and TXGA can provide a complete one-stop solution for your product research and development. Go to TXGA [Product Center] to learn more.