E.g.o. Elektro-geraetebau Gmbh

Oliver Gremm

Wilfried Schilling

Christian Egenter

Elmar Herweg

Wilhelm Perrin

Alfred Fischer

Juergen Katzenmayer

The invention provides according to one example a display device for a domestic electric heating appliance, such as for example a glass ceramic hob, the electric heating appliance having at least one heating device. The latter is subdivided into several flat heating areas, which can be activated at least partly independently of one another and/or singly for heating operation. The display device optically displays the heating operation or the activation of individual heating areas. For this purpose it has individually activatable illuminating devices. The illuminating devices are constructed as separate segments of a geometrical basic shape, such as a rectangle or preferably a circle. For each display device there are two basic shapes of the same nature, but different size and having a concentric arrangement.

Display device with illuminating device for a domestic electric heating apparatus

A touch switch layout for a hob having several hotplates is described. For said hotplates is in each case provided a separate selection switch with which the power can be selected in each case. There is also a single, common touch switch for power reduction for all the hotplates. According to the associated operating method, on operating the common power control switch only the power of a selected hotplate is modified or reduced. The power of a hotplate is increased by briefly operating a selection button as selection and renewed operation of the selection button as an increase. This then functions as a power increase switch. It is obvious that the function can also be reversed.

Touch switch layout and method for the control of a touch switch

A description is given of a temperature detection device for an electric radiant heater, with which is associated an active sensor for detecting the positioning of a cooking vessel on a hotplate, particularly a glass ceramic plate, covering the radiant heater. This sensor is part of an inductive resonant circuit of a control means and preferably has a single sensor loop of electrically conductive material located in the vicinity of at least one heating zone heatable by electric radiant elements and preferably partly overlapping the same. According to the invention, with at least one portion the sensor loop forms a functional element of a temperature sensor of the temperature detection device. For example, a tubular sensor loop portion can serve as a supporting or protective jacket of a jacket thermocouple.

Temperature detection device for an electric radiant heater

The invention in one embodiment provides a circuit arrangement for a sensor element of a contact switch, in which a high frequency control signal ( ) is applied to the sensor element ( ). The circuit arrangement ( ) has a signal source ( ) for the control signal ( ), a transistor (T), to whose base (B) is applied across a pass filter (R C ) and a voltage divider (C ) the control signal ( ), a resistor (R ) applied to ground ( ) ensuring a certain base current, the transistor collector (C), to which the output signal ( ) is applied, is connected to ground across a capacitor (C ), whilst between the transistor base (B) and ground is located a capacitive sensor element ( ). A preferred application field of the invention is a touch contact switch of a glass ceramic hotplate of an electric cooker.

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Kuernbach, Germany

Oliver Gremm