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

Abstract

The invention is applicable to the field of power supply, and provides a cold backup switching method, circuit and redundant power supply of a redundant power supply. The method includes: sampling the total output current, and determining the efficiency of the redundant power supply according to the current sampling value; judging the redundant power supply Whether the efficiency is lower than half load; if so, output the first or second cold backup control signal; disconnect the first branch according to the first or second cold backup control signal, and control the power output through the second branch; if not, Then output the first and second work control signals; close the first branch according to the first or second work control signal, and control the power output through the first branch; the voltage output by the second branch is lower than the voltage output by the first branch . The present invention controls a power supply to enter the cold backup state when the power supply efficiency is lower than half load, so as to improve the power supply efficiency, and when the normal power supply is switched to the cold backup power supply, the voltage output is always maintained, no need for a large capacitor buffer, and the reliability is high. low 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

Images