| 摘要 |
The present invention relates to a fire sensing apparatus having a self-diagnosis function which senses a fault of a sensing sensor itself constituting the fire sensing apparatus for itself, and transmits the result to a receiver. The fire sensing apparatus of the present invention comprises: a sensing sensor for sensing a fire situation by being designed to increase an inrush current in case a fire is sensed; a current sensing part for sensing a current flowing in from the sensing sensor; a state judgment part which receives the current sensed in the current sensing part, and judges a normal state, outbreak of a fire and a fault of the sensor according to the level of the current; a signal converting part for generating one sensing signal among a normal signal, a fire outbreak signal or a sensing sensor fault signal according to the result of the state judgment part; a bridge circuit which receives a DC electricity and a call signal from a fire receiver by being connected to a DC line, and delivers a response signal to the DC line; a call signal receiving part for outputting a designated code by receiving the call signal included in the DC line; a multiplexing part for multiplexing the sensing signal of the signal converting part to the designated code inputted through the call signal receiving part; a response signal transmitting part for converting the signal multiplexed by the multiplexing part and then transmitting a response signal; and a power source chip for stabilizing an input voltage of the bridge circuit and providing a Vcc voltage required in a printed circuit board. |
