U.S. Philips Corporation

Whirlpool International B.v.

Mats G Idebro

Franciscus Kokkeler

Mario Fioroli

Enzo Cigarini

Per O Risman

Liliana Vigano

Bo G Joelsson

A method and device for determining when a food (9) has thawed in a microwave oven (1) are provided. The food (9) is placed above an element (14) constructed of a microwave sensitive material and shields the element (14) from the microwaves to a different extent according to its degree of thawing. The temperature increase in the material resulting from its absorption of the microwaves is measured by a transducer (18) which receives a signal operationally related to the temperature and which on the basis for the signal halts the thawing when the temperature has reached a suitable value. The element (14) is associated with a food support (8) which thermally isolates it from the food (9), the element being in direct or indirect contact with the transducer (18). The transducer (18) can be disposed either in the food support (8) or in the bottom wall (7) of the oven thawing chamber (4) below the support (8).

Method and device for determining when a food has thawed in a microwave

A microwave oven for heating food, in which power control is by pulsing a microwave source during a sequence of operation periods. The start moment of the microwave source is sensed during each operation period, and the switch on time of the microwave source during each operation period is calculated from the sensed start moment. Start moment related variations in supplied average power level are eliminated.

Microwave oven with improved microwave power control

A microwave oven is shown which has a defrosting mode the length of which is determined solely by the humidity in the air in the oven provided by moisture from a frozen article, particularly frozen food, being defrosted in the oven.

Microwave oven with improved defrosting mode

Growing community of inventors

Norrkoping, Sweden

Mats G Idebro