Patent ID: 7109447

Claim:
A convection cooking appliance comprising: a cabinet including top, bottom rear and opposing side walls; a cooking chamber including top, bottom, rear, opposing side walls and a frontal opening; a door movably mounted relative to the cooking chamber for selectively closing the frontal opening; a heating device provided in the cabinet for performing a portion of a cooking operation; a convection fan arranged in the cabinet to direct a convective air flow into the cooking chamber; and a control system for regulating a speed of the convection fan and an intensity of the heating device during a cooking operation by altering an AC waveform provided to the convection fan and the heating device, said control system including a triac, as well as a controller for turning on the triac at select points in the AC waveform to create a delay from a zero point crossing of the AC waveform, thereby simultaneously altering an amount of power sent to each of the convection fan and the heating device.