Electric heating – Heating devices – With power supply and voltage or current regulation or...
Patent
1986-06-05
1988-05-17
Paschall, M. H.
Electric heating
Heating devices
With power supply and voltage or current regulation or...
219497, 219501, 219506, 323236, H05B 102
Patent
active
047452625
ABSTRACT:
A control system for controlling the supply of electrical power to a heating element associated with an electrical appliance such as a frypan. The application of power to the heating element is controlled in two distinct modes, a first mode for simmering and a second mode for cooking. The two modes are characterized by a control signal which exhibits control periods having a relatively short duration during the simmer mode and a relatively long duration during the cooking mode. The present invention also delays actuation of a switching element responsive to the control signal in order to compensate for inertial delays caused by the opening and closing of the switching element. The switching element is thus actuated at a time delayed from a zero crossover of an alternating current power supply by an amount corresponding to the opening or closing delay time associated with the switching element such that switching occurs at times which coincide with the zero crossover points of the alternating current power. As a result, a more rapid response and improved control are achieved at relatively low temperature settings while the control of temperature over a broad range is maintained.
REFERENCES:
patent: 3959692 (1976-05-01), Wetzel
patent: 4086466 (1978-04-01), Scharlack
patent: 4243875 (1981-01-01), Chang
patent: 4276603 (1981-06-01), Beck et al.
patent: 4337388 (1982-06-01), July
patent: 4546239 (1985-10-01), Sugimori
Appliance Control Systems (Holdings) Pty. Ltd.
Paschall M. H.
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