Circuit system for heat adjustment in fan module

Abstract

When fan module is hot plugging to an application system, a soft start up circuit module included in the circuit system is in charge of starting up power supply for the fan module. The soft start up circuit module includes a capacitor and a field effect transistor. When input voltage of the soft start up circuit module is switched from non-zero value to zero value, the capacitor releases electric charge, and the field effect transistor is turned off.

Description

technical field [0001] The present invention mainly relates to a circuit system of a fan module, in particular to a circuit system for hot swap of a fan tray module. Background technique [0002] At the moment of hot plugging a fan module into an application system and starting the fan module, the application system will generate a voltage spike and an inrush current ( inrush current) and cause sparks. These voltage surges and inrush currents often easily cause overvoltage protection and over current protection devices at the power supply end of the system to malfunction, thereby causing the shutdown of the application system. [0003] In order to avoid the above-mentioned problems, the fan module is usually equipped with a hot-swappable circuit, so that the fan module is hot-swapped into an application system and the startup is a soft start (soft start), so as to prevent the fan module from starting. The resulting voltage surge and inrush current. [0004] As shown in FI...

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Problems solved by technology

[0005] However, such an approach has the following disadvantages: first, the design cost of the analog controller IC 11 is high and expensive; second, the voltage supply range of the analog controller IC 11 is not large enough, and the maximum negative voltage value is only 0.3 Volts, it is easy for the fan module 16 to be damaged by the instantaneous negative voltage (negative voltage) at the moment of hot-plugging; thirdly, the driving ability of the analog controller IC 11 for the transistor switch 12 is not good; and the second 4. The thermal swapping circuit 1 has limited suppression effect on voltage shock and inrush current in the application of high current and high voltage circuit of the fan module

[0006] In addition, the heat exchange circuit 1 lacks a proper discharge loop, so that part of the inrush current will accumulate in the heat exchange circuit 1, and the accumulated inrush current will The flow will trigger the current protection device of the application system (not shown) and cause the shutdown of the entire application system (not shown)

For example, when the application system recovers power quickly after a trip caused by natural thunder and lightning, it is often because the charge in the capacitor bank 15 of the heat-swapping circuit 1 has not been discharged completely, resulting in an excessive inrush current and shutting down the system

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