Induction cook-top system

H - Electricity – 05 – B

Patent

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327/19

H05B 1/02 (2006.01) H03K 17/00 (2006.01) H05B 6/06 (2006.01) H05B 6/12 (2006.01)

Patent

CA 1108704

INDUCTION COOK-TOP SYSTEM AND CONTROL ABSTRACT OF THE DISCLOSURE This specification discloses an induction heating cook-top including touch controls for controlling the operation thereof. The cook-top includes a source of direct current voltage and a first heating unit having a first induction heating coil connected to the direct current voltage source and an SCR having an anode coupled to the coil and a cathode connected to AC circuit ground. The system further includes a second heating unit including a second induction heating coil and a second SCR connected between the second coil and the source of direct current voltage. The second SCR includes a cathode connected to AC circuit ground. Circuitry is provided to apply gating pulses to both of the SCRs in order to control the heating of the induction heating coils. A touch control system is provided to control the heating level of the induction heating coils and includes heat control touch pads for increasing or decreasing the energization of the coils. Lock circuitry inhibits the heat control touch pads to prevent energization of the coils, unless an unlock switch is actuated for a predetermined time interval. The system further includes a bar graph display for indicating the amount of heat being generated by the coils and includes circuitry for increasing the length of the bar graph at a relatively high rate and decreasing the length of the bar graph at a reduced rate in order to facilitate accurate setting of the heat level of the coils.

306460

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