Patent ID: 6446624
Filing Date: 2002-09-10
Classification: B08B,F24C,G05B,Y10S

Abstract:
A smart circuit device of a smoke exhauster for cooking, said device comprising:a temperature-sensing component for detecting a variation in temperature and output of a signal responsive thereto; a sealed supersonic transducer for detecting a quantity of smoke and output of a signal responsive thereto; a temperature sensor signal processing circuit connected to said temperature-sensing component and used to amplify and compensate the signal output by said temperature-sensing component, and output a signal corresponding to the temperature detected by said temperature-sensing component; a supersonic transducer signal processing circuit connected to said supersonic transducer and used to amplify and filter the signal output by said supersonic transducer, and output a corresponding signal, said signal output by said supersonic transducer signal processing circuit having a frequency not greater than 7 Hz and varying in both amplitude and slope; a microprocessor control circuit respectively connected to said temperature sensor signal processing circuit and said supersonic transducer signal processing circuit and used to receive the signals from said temperature sensor signal processing circuit and said supersonic transducer signal processing circuit and transfer said signals to a microcomputer database subsequent to an analog-to-digital conversion thereof; a motor-driving circuit connected to said microprocessor control circuit for receiving a signal from said microprocessor control circuit to control rotational speed of a motor of the smoke exhauster responsive to said signals received from at least one of said temperature sensor signal processing circuit and said supersonic transducer signal processing circuit; and a power circuit providing electricity for each said circuit; whereby responsive to detection of smoke or a rise in temperature, said microprocessor control circuit will operate according to a fuzzy control theory so that the motor of the smoke exhauster is automatically adjusted to operate at a proper rotational speed.