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Design method for preventing upper MOS of VR from being broken down to burn up CPU

A design method, P12V technology, applied in the protection of under-voltage or no-voltage, data processing power supply, etc., can solve the problems of burning the CPU, burning the CPU, and using it for a long time.

Inactive Publication Date: 2015-04-29
LANGCHAO ELECTRONIC INFORMATION IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A problem that cannot be avoided whether it is a digital power supply or an analog power supply is: in a set of VR lines powered by multiple phases, once the upper MOS of one of the VR phases burns out, the 12V voltage on the motherboard will pass through the inductor in an instant. Directly connected to the CPU, causing the CPU to be burned due to overvoltage
At present, in the production line test and actual application of traditional servers, due to poor production line process or long-term use, the upper MOS of VR is broken down and the CPU is burned, resulting in secondary losses, and the server CPU is expensive.
This imposes enormous costs on the business

Method used

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  • Design method for preventing upper MOS of VR from being broken down to burn up CPU
  • Design method for preventing upper MOS of VR from being broken down to burn up CPU

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Embodiment Construction

[0011] Refer to the attached figure 1 , 2 , the present invention is further described by means of specific embodiments:

[0012] like figure 1 The schematic diagram of the VR principle before improvement is shown: it can be seen that if the upper MOS of VR is broken down, P12V_CPU0 will be directly connected to PV_VCCP_CPU0 through the upper MOS, and PV_VCCP_CPU0 is the power supply of the CPU, so once the upper MOS is hit wear, it is equivalent to the CPU directly connected to 12V, causing MOS to burn;

[0013] like figure 2 Shown is the improved design method (that is, proposed in this paper), which is realized by adding a PMOS at both ends of the input capacitor; in this way, when the upper MOS of VR breaks down, the voltage at both ends of the input capacitor will decrease, once The reduced voltage value is less than 3.3V (if the G electrode voltage is set higher, the trigger will be earlier), the VGS of the PMOS is less than 0, the PMOS will be turned on, and P12V_C...

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Abstract

The invention provides a design method for preventing an upper MOS of a VR from being broken down to burn up a CPU, and relates to the field of server DC power supply. PMOSs are added to two ends of an input capacitor; whether the upper MOS of the VR is broken down or not is judged by sensing voltage at two ends of the VR input capacitor; once the upper MOS is broken down, P12V is immediately pulled down, and short circuit protection of input voltage is triggered, so that power failure of the overall system is achieved; and the CPU is prevented from being burnt out.

Description

technical field [0001] The invention relates to the field of server DC power supply design, in particular to a design method for preventing CPU from being burned due to upper MOS breakdown of VR. Background technique [0002] In the current server motherboard power supply system, the VR (Voltage Regulator) design of the CPU power supply part is the most important. A problem that cannot be avoided whether it is a digital power supply or an analog power supply is: in a set of VR lines powered by multiple phases, once the upper MOS of one of the VR phases burns out, the 12V voltage on the motherboard will pass through the inductor in an instant. Directly connected to the CPU, causing the CPU to be burned due to excessive voltage. At present, in the production line test and actual application of traditional servers, due to poor production line process or long-term use, the upper MOS of VR is broken down and the CPU is burned, resulting in secondary losses, and the server CPU is...

Claims

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Application Information

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IPC IPC(8): G06F1/28H02H3/24
CPCG06F1/28H02H3/24
Inventor 吴福宽武宁
Owner LANGCHAO ELECTRONIC INFORMATION IND CO LTD
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