Input power supply health detection and management circuit in power supply parallel redundancy system

Abstract

The invention provides an input power supply health detection and management circuit in a power supply parallel redundancy system. The input power supply health detection and management circuit in a power supply parallel redundancy system includes an input anti reversal connection unit, an input over-current short circuit protection unit and an input overvoltage protection unit, wherein the inputanti reversal connection unit includes a resistor R18, a resistor R19, and an N type MOS transistor Q2; the input overvoltage protection unit includes a resistor R4, a resistor R11, a PNP triode V3 and an N type MOS transistor Q1; and the input over-current short circuit protection unit includes a power supply circuit, a resistor R8, a resistor R16, a Hall current sensor U1, a capacitor C4, a comparator U2, a diode D1 and a diode D2. The input power supply health detection and management circuit in a power supply parallel redundancy system has the advantages of being simple in structure, beingindependent in the device, being reasonable in design, being able to realize over-current short circuit protection, overvoltage protection and anti reversal connection protection at the same time.

Description

technical field [0001] The invention relates to the protection of a power input end of a power parallel redundant system, in particular to an input power supply health detection and management circuit in the power parallel redundant system. Background technique [0002] In order to ensure the normal operation of the system, the power supply system of some key equipment such as servers and switches often adopts a redundant structure to eliminate single point failures of the power system. In the power supply parallel redundant power supply system, when one of the power boards fails, the system needs to automatically remove the power board, and the other power boards share the extra system load, so as to ensure the normal operation of other devices in the system. And if there is an abnormality in the input source, in order to protect the downstream circuit of the power board from damage, it is necessary to take protective measures such as anti-overvoltage and anti-reverse conne...

AI Technical Summary

Problems solved by technology

The methods for implementing these protections in the prior art include: ①Input overcurrent and short circuit protection: the input overcurrent and short circuit protection of the power supply is carried out by connecting a fuse at the input end of the power supply, so as to realize the input redundancy requirements in the redundant power supply system; In some cases where the input current is relatively large, after derating the rated current parameters of the fuse, it is necessary to select a fuse with a relatively large current specification, which is difficult to select, and this protection method cannot be restored

②Input over-voltage protection circuit: In the case of high-voltage input, the varistor is generally used to realize input over-voltage protection; but in the case of low-voltage input, there is no varistor with suitable specifications for selection, and this protection method is also not available. recover

③Input anti-reverse connection circuit: The power input anti-reverse connection protection is implemented by connecting an anti-reverse connection diode on the input bus, and when the input current is relatively large, the ordinary diode has a relatively large tube voltage drop, so it is The power consumption of the power supply during normal operation is relatively large, which will reduce the working efficiency of the power supply, and also need to take heat dissipation measures for the diode, which increases the difficulty of engineering design

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