PURPOSE: To secure proper combustion of a burner at all times, by a method wherein, in a system for controlling combustion of the burner through driving of an electromagnetic pump according to a pulse signal, a pulse signal is controlled in consideration of a change in the airflow of a blast fan due to variation in a power voltage.
CONSTITUTION: During operation, a difference between the outputs of hot blast temperature and desired temperature input circuits 1 and 2 is determined by a differential amplifying circuit 3, and according to the difference, an output signal is generated. The output signal is inputted through a V/F converting circuit 4 to a control pulse output circuit 5 to control ON and OFF operation of the drive power for an electromagnetic pump 6. In which case, when variation in a voltage is produced at the drive power, a control pulse signal, increased or decreased in ON-time width, is outputted from a control pulse output circuit 5 so that the fuel, adjusted so as to provide the proper amount of fuel according to a change in the airflow of a blast fan caused resulting from variation in a voltage, is supplied to a burner. Namely, when a power voltage is higher (or lower) than a set voltage, a pulse signal. increased (or decreased) in ON-time width, is outputted.
HARUNA MITSUAKI
NAGAI TAKASHI
FUJIOKA SADAKAZU
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