Mobile power supply

Abstract

The invention provides a mobile power supply, comprising a battery, an inductor L1, a capacitor C2, a first switch, a second switch, a third switch and a charging and power-supplying control circuit, wherein the first switch is connected between a power supply node and a middle node; the inductor L1 is connected between the middle node and a battery node; the capacitor C2 is connected between the battery node and the ground; the second switch is connected between the middle node and the ground; the third switch is connected between the middle node and a charging node; when a charging power supply is connected with the charging node, the charging and power-supplying control circuit controls the first switch to be switched off, and controls the second switch and the third switch to be switched on alternatively; and when the charging power supply is not connected with the charging node, the charging and power-supplying control circuit controls the third switch to be switched off, and controls the first switch and the second switch to be switched on alternatively. The mobile power supply provided by the invention has the advantages that a charging circuit and a power supply circuit reuse partial peripheral devices, so that not only can the high-efficiency charging mode be increased, but also the fewer peripheral devices can be maintained, and the low cost is realized.

Description

【Technical field】 [0001] The invention relates to the field of power supplies, in particular to a mobile power supply. 【Background technique】 [0002] A mobile power supply is a portable charger that integrates power supply and charging functions. It can charge mobile phones and other digital devices anytime, anywhere or standby power. Lithium batteries or dry batteries are generally used as power storage units. The battery that is different from the internal configuration of the product is also called an external battery. It is generally equipped with a variety of power adapters, which usually have the characteristics of large capacity, multi-purpose, small size, long life, safety and reliability. Functional product for power supply or standby charging of the product. [0003] Please refer to figure 1 As shown, it is a schematic circuit diagram of a mobile power supply in the prior art. The mobile power supply includes a battery BAT, a charging circuit 110 and a power ...

AI Technical Summary

Problems solved by technology

[0004] In the prior art, the charging circuit 110 and the power supply circuit 120 are relatively independent, and the charging management circuit 112 mostly adopts a linear charging structure, which has low charging efficiency and severe heat generation, resulting in too small charging current and long charging time under conventional packages.

If a switch-type charging circuit is simply used, additional inductance and too many switching devices are required, and the cost will increase a lot

Images