| 摘要 |
The present invention relates to a power supply system for video cameras (2) and for protection cases (1) for video cameras. The system comprises a first device (13), called as powered device since it receives power from a remote device, able to split a supply voltage (131) and a data signal (130) from a power supply input line (18). A plurality of power supply lines (14a-14e) are connected to a first output of the powered device (13) and they supply a plurality of electric components (7, 8, 9,10) via the supply voltage (131) extracted by the powered device (13). The system further comprises a power supply equipment (19) connected to the powered device (13) so as to receive as input the supply voltage and the data signal split by the powered device. The power supply equipment (19) supplies on an output line (20) an output voltage and the data signal, and it informs a control circuit (16) about the electric power requested on the output line (20), that is by the video camera connected to this line. The control circuit (16) is operatively connected to the power supply lines (14a-14e) of the electric components (7, 8, 9,10) and it stops or reduces power absorption from one or more power supply lines (14a-14e) in case the electric power requested by the electric components and by the power supply equipment exceeds a predetermined value. A case and a method for powering it are also described. |
