| 主权项 |
1. A wireless camera system, comprising:
a plurality of battery-powered, wireless node cameras, each node camera comprising an image sensor for capturing image data, a radio unit for performing wireless communications, at least one processing unit for controlling the image sensor and radio unit, and a battery control unit; and an access point configured to communicate wirelessly with each of the node cameras, and further configured to communicate with a control center that communicatively couples the access point to a computer network, wherein the battery control unit in each node camera, comprises:
a first battery and a second battery coupled to each other in a parallel configuration, each of the first and second batteries having a negative terminal coupled to an electrical ground;a first switch having a first terminal coupled to a positive terminal of the first battery and a second terminal coupled to a power terminal of a respective node camera;a second switch having a third terminal coupled to a positive terminal of the second battery and a fourth terminal coupled to the power terminal;a first voltage sense unit coupled to the positive terminal of the first battery for sensing a voltage at the positive terminal of the first battery;a second voltage sense unit coupled to the positive terminal of the second battery for sensing a voltage at the positive terminal of the second battery;a first control unit coupled to the first switch for controlling the first switch in response to the voltage sensed by the first voltage sense unit; anda second control unit coupled to the second switch for controlling the second switch in response to the voltage sensed by the second voltage sense unit. |
