Digital control circuit

Details Digital control circuit Digital control circuit

1983-01-17

1985-06-11

Wayner, William E.

Automatic temperature and humidity regulation

With timing element

Timer other than clock

307269, 307351, 431 69, F23N 520, H03K 513

Patent

active

045223378

ABSTRACT:
In a digital control circuit, a clock pulse is counted so that when a predetermined timing is reached the driving of a load is controlled. The digital control circuit may preferably be an integrated circuit for controlling the combustion of a burner for a combustion apparatus such as a water heater or an air heater. The combustion control circuit performs the igniting operation for a predetermined period of time and the supply of fuel is stopped if the ignition can not be attained within the predetermined period. In the digital control circuit, a clock pulse having a predetermined bias voltage is counted by a time measuring circuit and whether the clock pulse has the predetermined bias voltage or not is judged by a detecting circuit so that the igniting operation is stopped when the clock pulse has the predetermined bias voltage, thereby avoiding a risk that, if the input of the clock pulse is interrupted within the predetermined period, the predetermined period may be prolonged indefinitely and the supply of fuel may be continued even though ignition has not been attained.

REFERENCES:
patent: 4145179 (1979-03-01), Tanaka et al.
patent: 4216517 (1980-08-01), Takahash
patent: 4245150 (1981-01-01), Driscoll et al.
patent: 4291357 (1981-09-01), Hong

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