Induction cookers are extremely energy efficient. EPCOS supplies a full range of components, including film capacitors, chokes, transformers, thermistors and varistors.

Induction cookers are the true king among cookers. Their high efficiency, increasingly important in times of rapidly rising energy costs, greatly distinguishes them from their conventional counterparts. With an efficiency rate of close to 90 percent, they are far *ior to gas cookers (40 percent) or conventional electric cookers (50 to 60 percent). Leading European manufacturers of kitchen appliances such as BSH Bosch Siemens Hausgeraete, Fagor and Arcelik now manufacture these high-tech appliances in series.

Induction cookers achieve this high efficiency by means of a sophisticated technology that heats up only special cookware that has a ferromagnetic base. The induction cooker itself produces no heat, but generates an alternating magnetic field in the cooking zone via a coil operated at a frequency of 20 to 50 kHz. This field in turn generates eddy currents in the base of the cookware, thus producing the required heat. This effect is further reinforced by hysteresis losses that generate more heat. The cookware acts like a short-circuited secondary winding of a transformer. Figure 1 shows the basic configuration of the power circuit of an induction cooker.

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