公开(公告)号：US20210267020A1

公开(公告)日：2021-08-26

申请号：US17255023

申请日：2019-06-13

Applicant: ELECTROLUX APPLIANCES AKTIEBOLAG

Inventor： Laurent JEANNETEAU ,  Alex VIROLI ,  Massimo NOSTRO ,  Federico BALEST

IPC: H05B6/06 ,  H05B6/12

Abstract: The invention relates to a method for operating an induction hob (1), the induction hob (1) comprising a power circuit portion (2) with at least one switching element adapted to provide pulsed electric power to an induction coil (3) and a control entity (4) for controlling operating parameters of the switching element, the method comprising the steps of: performing a control loop with control cycles in order to detect coupling changes between the induction coil (3) and a piece of cookware, said control cycles comprising the steps of: o receiving frequency information (fcurr) and power information (Pcurr) at said control entity (4); o calculating at least one relation coefficient (Ds′, Ds″) based on said frequency information (fcurr) and said power information (Pcurr); and o comparing said relation coefficient (Ds′, Ds″) with a relation coefficient boundary, thereby de-riving a comparison result; deciding, based on the comparison result, whether to: o perform a new control cycle of said control loop or whether to o stop said control loop and said provision of pulsed electric power to the induction coil (3) and re-start said control loop after updating an operating parameter of the switching element.

公开(公告)号：US20210410237A1

公开(公告)日：2021-12-30

申请号：US17469977

申请日：2021-09-09

Applicant: ELECTROLUX APPLIANCES AKTIEBOLAG

Inventor： Laurent JEANNETEAU ,  Alex VIROLI ,  Massimo NOSTRO ,  Federico BALEST

IPC: H05B6/06 ,  H05B6/12

Abstract: The invention relates to a method for operating an induction hob (1), the induction hob (1) comprising a power circuit portion (2) with at least one switching element adapted to provide pulsed electric power to an induction coil (3) and a control entity (4) for controlling operating parameters of the switching element, the method comprising the steps of: performing a control loop with control cycles in order to detect coupling changes between the induction coil (3) and a piece of cookware, said control cycles comprising the steps of: receiving frequency information (fcurr) and power information (Pcurr) at said control entity (4); calculating at least one relation coefficient (Ds′, Ds″) based on said frequency information (fcurr) and said power information (Pcurr); and comparing said relation coefficient (Ds′, Ds″) with a relation coefficient boundary, thereby deriving a comparison result; deciding, based on the comparison result, whether to: perform a new control cycle of said control loop or whether to stop said control loop and said provision of pulsed electric power to the induction coil (3) and restart said control loop after updating an operating parameter of the switching element.