| 摘要 |
A fire monitoring circuit is provided to reduce a manufacture cost by simplifying a circuit unit to improve monitoring efficiency. An ultraviolet monitoring sensor(10) monitors an ultraviolet band to generate a flame. A rail to rail OP AMP(OPerational AMPlifier)(20) is connected to the ultraviolet monitoring sensor and normally performs amplification without deformation of an output waveform even when input seriously swings. An amplification stage(30) amplifies output of the rail to rail OP AMP. An AND circuit(40) is connected to an output stage of the amplification stage. A noise determining clock signal unit(50) transmits a clock signal(5) by being connected to the AND circuit. An A/D converter(60) converts an amplification stage signal into a digital signal by being connected to the output stage of the amplification stage. A control unit(70) compares output of the AND circuit with the clock signal to determine a fire and receives output of the A/D converter to determines a size of the fire, thus outputting the determination result with a control signal. |
