| 摘要 |
A double power sources switching circuit comprises a detection unit utilizing a detection chip to detect a voltage state of a first power input terminal to provide a stable and accurate voltage level and output a corresponding signal; a power source switching circuit respectively electronically connected to a power output terminal, a second power input terminal and the detection unit and adapted to output a signal depending on the detection unit to determine whether to switch the second power input terminal to be electrically connected and transmit power to an electronic product using double power sources, therefore, the electronic product can be prevent from being reset or locked in the process of power source switching and the stability of a double power sources switching system can be elevated.
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