Electricity: power supply or regulation systems – Input level responsive – Phase controlled switching using electronic tube or a three...
Patent
1993-10-28
1996-01-09
Wong, Peter S.
Electricity: power supply or regulation systems
Input level responsive
Phase controlled switching using electronic tube or a three...
323235, 323319, 323322, G05F 502
Patent
active
054831490
ABSTRACT:
This present invention takes advantage of the understanding that the voltage rating associated with resistive heating element can be ignored over the common line voltage range, provided the power dissipation is controlled. This is accomplished by applying a fractional amount of power to a heating element from the power source. The method consists basically of determining, or estimating, a ratio of the amount to be applied to the amount of power available. A control signal is generated with a duty cycle approximately equal to that ratio. A zero crossing switch, under control of the control signal switches half cycles to the heating element. Thus, by applying a portion of the available half cycles to the heating element, the average power dissipation by the heating element can be controlled.
REFERENCES:
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patent: 4629852 (1986-12-01), Andre
patent: 4928055 (1990-05-01), Kaieda et al.
patent: 5138192 (1992-08-01), Hsu
patent: 5329223 (1994-07-01), Riggio
Baca Anthony J.
Berhane Adolf
Hewlett--Packard Company
Wong Peter S.
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