Electronic apparatus capable of automatically choosing power supply source

Abstract

An electronic device capable of automatically selecting power supplies can automatically select a power supply from a plurality of power supplies to supply power to the electronic device. Three optional power supplies include one internal battery and two external power supplies, wherein the two external power supplies can be a DC power supply converted from a city power supply by an adapter and an interface power supply or other external power supplies. The battery voltage is larger than the voltage at least one of the external power supplies, and a power selection module is arranged between the interface of the external power supply having a voltage smaller than the battery voltage and the battery. Three one-way conduction components are respectively arranged in the output paths of the voltage positive electrode ends of the three power supplies, wherein a path switch is also arranged between the voltage positive electrode end of the battery and the one-way conduction components. Through the action of the one-way conduction components, the power selection module and the path switch, the three power supplies can be selected in the following sequence: the external power supply with higher voltage, the external power supply with lower voltage and the internal battery.

Description

technical field [0001] The invention relates to an electronic device, in particular to an electronic device capable of automatically selecting a power supply. Background technique [0002] At present, general electronic devices such as mobile phones, MP3 players and other handheld devices mostly have multiple power supply methods, such as battery power supply, power supply through the mains adapter, and power supply through the USB interface. When there is an external power supply, the external power supply can be used For example, supply power through a commercial power adapter, USB interface, etc., which can increase the options for power supply of the handheld device, so as to avoid the problem of no power in the handheld device as much as possible. [0003] However, when several power ports are connected at the same time, only one power supply can supply power, otherwise voltage abnormalities will occur. In a patent document with the patent number "CN2838129Y" and the t...

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Problems solved by technology

[0004] In view of this, a device for automatically selecting a power supply through a simple circuit structure is provided to solve the problem in the prior art that the previous power supply needs to be removed to select the next power supply and the flexibility of the shrapnel switch will be reduced due to long use time. falling problem

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