Cold backup switching method and circuit for redundant power supply, and redundant power supply

Abstract

The invention is applicable to the field of power supplies, and provides a cold backup switching method and circuit for a redundant power supply, and the redundant power supply. The cold backup switching method comprises the steps of sampling output total current, an determining the redundant power supply efficiency according to the current sampling value; judging whether the redundant power supply efficiency is lower than half load; if so, outputting a first cold backup control signal or a second cold backup control signal; disconnecting a first branch circuit according to the first cold backup control signal or the second cold backup control signal, and controlling the power supply to be output through a second branch circuit; or otherwise, outputting a first working control signal or a second working control signal; closing the first branch circuit according to the first working control signal or the second working control signal, and controlling the power supply to be output through the first branch circuit, wherein the output voltage of the second branch circuit is less than that of the first branch circuit. When the power supply efficiency is lower than the half load, the power supply is controlled to enter the cold backup state to improve the efficiency of the power supply; and when the normal power supply is switched to the backup power supply, voltage output is always kept without requiring a large capacitor for buffering, so that the redundant power supply is high in reliability and low in cost.

Description

technical field [0001] The invention belongs to the field of power supplies, and in particular relates to a cold backup switching method, a circuit and a redundant power supply for a redundant power supply. Background technique [0002] At present, redundant power supplies with PMBus function are widely used in high-reliability fields such as servers and communication power supplies. Since these servers basically work 24 hours a day, in fact, due to the sharp drop in data processing during idle hours (such as late at night), these The power consumption of servers often works below half load, but the working efficiency of the power supply is usually low when below half load, resulting in energy waste. [0003] In the prior art, in order to save energy consumption, one of the power modules of the redundant power supply is usually controlled to enter the cold backup state, so that one power module does not output DC voltage, but the normal working power module is switched to th...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the embodiments of the present invention is to provide a cold backup switching method for redundant power supplies, aiming at solving the problem that the current redundant power supply has no current output when switching between the working power supply and the cold backup power supply, resulting in low reliability and high cost of the redundant power supply question

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