Design method for restraining surge current
A technology of inrush current and design method, applied in the field of server power supply, can solve the problems of system downtime and large inrush current, and achieve the effect of clear display
Inactive Publication Date: 2014-08-13
LANGCHAO ELECTRONIC INFORMATION IND CO LTD
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- Description
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AI Technical Summary
Problems solved by technology
In the actual debugging process, you will encounter: when the node is turned on, the +5V power supply on the power board for the hard disk will appear due to the instantaneous surge current, which will cause the line from +12V to +5V to trigger OCP (Over Current Protection). overcurrent protection), which will eventually lead to system downtime
Method used
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Embodiment Construction
[0037] 1) Add an RC series line to the GATE pole of the MOS tube;
[0038] 2) Refer to the SOA (i.e. safe operating area curve) in the MOS transistor datasheet to determine the time allowed for the MOS transistor to be in a semi-conducting state;
[0039] 3) Determine the values of R and C according to the time and the conduction voltage of the MOS transistor. According to the following formula:
[0040]
[0041] Wherein, is the allowable turn-on time of the MOS transistor, is the final discharge voltage of the G pole of the MOS transistor, is the initial voltage of the G pole of the MOS transistor, and is the voltage of the G pole when the MOS transistor is fully turned on.
[0042] In this way, a simple circuit to suppress the inrush current can be realized.
[0043] Except for the technical features described in the instructions, all are known technologies by those skilled in the art.
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The invention provides a design method for restraining surge current. Slow connection of an MOS switching tube is controlled to restrain the surge current at the starting up moment; an RC delay circuit is additionally arranged at the Gate electrode of the MOS switching tube so that control voltage at the Gate electrode can rise slowly until the MOS switching tube is opened; the MOS switching tube is an N type MOS switching tube; +5 V voltage input through VR is applied to the left end of the MOS switching tube; +5 V_HDD at the right end of the MOS switching tube is +5 V voltage used for supplying electricity to a hard disk; the RC delay circuit is additionally arranged at the G electrode of the MOS switching tube, a starting up signal PSON is processed through the delay circuit, and a signal of slow voltage rising is generated at the G electrode of the MOS switching tube.
Description
technical field [0001] The present invention relates to the technical field of server power supply, in particular to a design method for suppressing surge current. Background technique [0002] With the rapid development of the Internet and the continuous rise of cloud computing technology, the online business volume continues to increase. Higher requirements are put forward for the data processing capability and storage capacity of the server in the computer room. The general large-scale data center computer room costs every inch of land. Whether it is a rented computer room or a self-built computer room, the rent and cost are very expensive. In order to save floor space and make full use of space, RACK cabinet products for high-density deployment came into being. Such products generally have three characteristics: centralized power supply, centralized heat dissipation, and centralized management. In order to improve the data processing capability and storage capacity o...
Claims
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Login to View More IPC IPC(8): H02H9/02G06F1/28
Inventor 罗嗣恒吴福宽
Owner LANGCHAO ELECTRONIC INFORMATION IND CO LTD