Power-saving type USB charging structure

Abstract

The invention discloses a power-saving type USB charging structure. The power-saving type USB charging structure comprises a power supply, a first current conversion module and a second current conversion module; the first current conversion module is used for converting the power supply current into low current for supplying power; the second current conversion module is used for converting the power supply current into high current for supplying power; the power-saving type USB charging structure also comprises a USB charging interface, a trigger circuit and a charging switch circuit; and the charging switch circuit comprises a first current output node, a second current output node, a USB current output node, a gating module, a first on-off module and a second on-off module. According to the power-saving type USB charging structure, a portable external device can be powered by switching the second current conversion module in a shutdown state, so that the problems that the current obtained by switching the first current conversion module is low and the low current cannot meet the demands of supplying power and charging at the same time is solved; and in addition, the problem of overhigh power consumption caused in charging external devices by the system in the shutdown state is solved as well.

Description

technical field [0001] The invention relates to the technical field of USB charging, in particular to a power-saving USB charging structure. Background technique [0002] Currently, notebooks and tablet computers are equipped with USB charging ports, through which external devices can be charged. [0003] At present, the design of notebooks and tablet computers contains two kinds of electricity, one kind of electricity can provide a large current, but the conversion efficiency of this kind of electricity is low, and the other kind of electricity provides a small current, but the conversion of this kind of electricity high efficiency. The former is defined as a first current conversion module, and the latter is defined as a second current conversion module. [0004] At present, most systems can still charge external devices when they are turned off, and most of them use the first current conversion module to convert the system power into 5V to charge external devices. Alth...

AI Technical Summary

Problems solved by technology

Imagine that if the system is only powered by batteries at this time, the battery life of the system will be greatly reduced.

[0005] In addition, there are still some systems that only supply power through the second current conversion module in the shutdown state. At this time, if charging external devices, the efficiency is slow, and it may not be able to meet the needs of system power supply and charging at the same time.

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