| 摘要 |
An external power supply (1, 1a, 1b) and a system connection detection unit (12, 12a, 12b) applied thereto are provided. For providing DC power, the external power supply (1, 1a, 1b) separably connects with a positive input terminal (Tc) and a negative input terminal (Td) of a system (2) through a positive output terminal (Ta) and a negative output terminal (Tb) respectively. When the positive output terminal (Ta) and the negative output terminal (Tb) are respectively connected to the positive input terminal (Tc) and the negative input terminal (Td), a system detection terminal (DETa) connects with a system connection terminal (DETb) of the system (2), and a connection status signal (CS) generated by the system connection detection unit (12, 12a, 12b) switches the operation of the external power supply (1, 1a, 1b) from deep sleeping mode to normal operation mode. The system connection terminal (DETb) is electrically connected to one of the positive input terminal (Tc) and the negative input terminal (Td) through at least a first resistive element (Rs). |
