Multiple output power supply time sequence control device and method

Abstract

The invention discloses a multiple output power supply time sequence control device and a method, and the method comprises at least one power supply circuit, wherein each power supply output circuit consists of a DC-DC switch power supply module and a voltage tracking module; the voltage tracking module is used for comparing the output voltage value of the DC-DC switch power supply module and thevoltage value of a given voltage tracking signal in the power-on or power-off process of the DC-DC switch power supply module, and feeding back the regulating signal for indicating increase or decrease of the voltage to the DC-DC switch power supply module; and the DC-DC switch power supply module is used for enabling the output voltage value to be consistent with the voltage value of the voltagetracking signal according to the feedback regulating signal. The invention uses the voltage tracking module controlled by the same voltage tracking signal to feedback the first voltage signal output by the DC-DC switch power supply module so as to lead the power-on time sequence of the DC-DC switch power supply module to be consistent with the power-off time sequence thereof.

Description

technical field [0001] The invention relates to the field of multiple output power supplies, in particular to a sequence control device and method for multiple output power supplies. Background technique [0002] The power supply is the energy source of electronic products, and a stable and reliable power supply is a prerequisite for ensuring the stable and reliable operation of electronic products. The complexity of integrated circuit chips used in modern electronic products is getting higher and higher, the number of integrated circuit chips used is increasing, and the demand for power supply voltage of products is becoming more and more stringent. During the power-on and power-off process of the product, for devices with multiple power inputs on a single board, each input power supply is generally required to comply with a strict and consistent power-on sequence and power-off sequence. If the power-on sequence and power-off sequence of the multi-output power supply canno...

AI Technical Summary

Problems solved by technology

There are some disadvantages in the above-mentioned method of using the power supply in series with the electronic switch to control the power-on sequence: for example, a dedicated power-on sequence control chip is required. Such a sequence control chip is generally expensive, which greatly increases the cost of the whole machine, and is generally used in DC -The MOS tube used as an electronic switch is connected in series between each output terminal of the DC switching power supply and the load, which also greatly increases the circuit complexity and the cost of the whole machine

In addition, the series connection of MOS tubes in the power circuit will also bring a certain turn-on loss, introduce additional voltage drop, deteriorate the load response characteristics of the power supply, and increase the heat loss of the motherboard, etc.

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