Patent ID: 11968765
Assignee: THE VOLLRATH COMPANY, L.L.C.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A circuit for inductively heating cookware, the circuit comprising:
a series resonant inverter circuit comprising a plurality of switches and one or more induction coils structured to inductively couple to the cookware to heat the cookware, the inverter circuit comprising a current sensor configured to sense a coil current signal across the one or more induction coils and generate a first sensed voltage signal corresponding to one of a positive portion or a negative portion of the coil current signal and a second sensed voltage signal corresponding to the other of the positive portion or the negative portion of the coil current signal; and
a control circuit configured to control switching of a first set of one or more of the plurality of switches based on the first sensed voltage signal and a second set of one or more of the plurality of switches based on the second sensed voltage signal, wherein the control circuit comprises:
a comparator module configured to compare the first sensed voltage signal and the second sensed voltage signal to a calculated bias voltage and provide a comparator output, the calculated bias voltage calculated based on a target current wherein the target current is the current at which the control circuit turns off or turns on one or more of the plurality of switches to implement zero current switching and/or zero voltage switching; and
a pulse width modulation module configured to implement the zero current switching and/or zero voltage switching using the comparator output by providing a control signal to the plurality of switches based on the comparator output.