Method and apparatus for controlling a heat source

Details Method and apparatus for controlling a heat source Method and apparatus for controlling a heat source

2006-03-14

2006-03-14

Van, Quang (Department: 3742)

Electric heating

Heating devices

With power supply and voltage or current regulation or...

C219S619000, C399S067000, C399S069000

Reexamination Certificate

active

07012222

ABSTRACT:
An apparatus and method of controlling the driving of a heat source using an AC voltage. If the temperature of the heat source is lower than a reference temperature and the level of the AC voltage is greater than a reference level, the level of a sensing signal is changed. Then, it is determined whether a predetermined period of time has lapsed from the moment when the level of the sensing signal has been changed. Thereafter, if it is determined that the predetermined period of time has lapsed from the moment when the level of the sensing signal has been changed, the heat source is driven when the level of the AC voltage is a zero level. Accordingly, if the frequency of a received AC voltage is not fixed to a specific frequency, but varies, or if the driving control signal is delayed and generated while the AC voltage has a constant frequency, the driving control signal is generated after the lapse of a predetermined period of time after the level of a sensing signal is transited from a high logic level to a low logic level. Thus, an AC voltage is supplied to a heat source at a regular duty cycle, thereby stably controlling the heat source and preventing occurrence of flickering.

REFERENCES:
patent: 5669038 (1997-09-01), Kishimoto
patent: 6301454 (2001-10-01), Nishida et al.
patent: 9-80961 (1997-03-01), None
patent: 2000-330653 (2000-11-01), None
patent: 1998-72500 (1998-11-01), None
patent: 2000-40693 (2000-07-01), None

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