Abstract: A device for frothing milk with a base element including a container for receiving milk to be frothed and a removable lid including a motor for driving a circular annular spring for frothing milk, the latter being driven by a motor in the lid. To this end, electrical energy needs to be transferred to the motor. This is done using inductive coupling. This removes the need for providing bare electrical contacts thus removing disadvantages like risk of short circuit and electrical shock hazards. To achieve this, both the base element and the lid are fitted with windings for transferring electrical energy. To improve the effectiveness of inductive coupling, frequency conversion means are provided to supplying an alternating current at a relatively high frequency to the first winding. The first winding is used as an inductive element for an oscillator as well.

Abstract: A device for frothing milk with a base element including a container for receiving milk to be frothed and a removable lid including a motor for driving a circular annular spring for frothing milk, the latter being driven by a motor in the lid. To this end, electrical energy needs to be transferred to the motor. This is done using inductive coupling. This removes the need for providing bare electrical contacts thus removing disadvantages like risk of short circuit and electrical shock hazards. To achieve this, both the base element and the lid are fitted with windings for transferring electrical energy. To improve the effectiveness of inductive coupling, frequency conversion means are provided to supplying an alternating current at a relatively high frequency to the first winding. The first winding is used as an inductive element for an oscillator as well.