| |
| Wireless sensor networks may be used in the explosion environment, such as underground tunnel in coal mine. In order to assure that nodes work normally, the power of the node must be intrinsic safety. An intrinsic safety power of nodes of which consists of power supply and intrinsic safety protection is developed. The power supply mainly consists of current-mode controller chip LTC1871 which controls the output voltage, can attains a stable output voltage. The intrinsic safety protection consists of a dual-stage electric current monitor chip and a voltage regulator tube, which is combined with an over-voltage protection that was integrated in LTC1871 to make up intrinsic safety protection circuit of double over-voltage and over-current protection. The theory analysis and simulation tests on discharge process of intrinsic safety power are described. The results display that the discharge energy is the nonlinear proportion of the current, increases with the current increasing, and the maximum discharge energy is less than 0.02mJ; the discharge power is the linear proportion of current, increases with the current increasing, and the maximum discharge power is less than 60W, which is within the permissible intrinsic safety standard, therefore the power is the intrinsic safety. |
|
| Keywords:Wireless sensor networks;Node;Power;Intrinsic Safety;Double Protection |
|
