Method for operating an electrical appliance and electrical appliance

Abstract

In a method for operating an electrical device with a rotary control device of an operating device having a rotatable control element, a setting value can be changed or operating modes for the electrical device can be selected depending on the rotation path or angle of the control element. By selecting the first rotation to the left or right, one of two different operating modes is selected. In this selected operating mode, a setting value can then be selected and set for operation of the electrical device by further rotating the control element.

Description

Area of application and state of the art

[0001] The invention relates to a method for operating an electrical appliance and to such an electrical appliance, in particular an electric cooking appliance. The electrical appliance has an operating device with at least one rotary operating device with a rotatable operating element as a handle. This rotary operating device or the rotatable operating element can be rotated in both opposite directions. Depending on a rotational path and / or a rotational angle of the rotary operating device or the operating element, a setting value, for example a power setting for a cooking zone of a hob or an oven muffle, or an operating mode for the electrical appliance, for example automatic operation or grill operation of an oven, can be selected.

[0002] Such rotary control devices are generally known from EP 797 227 A2, DE 10 2009 001 740 A1, EP 2 330 386 A2, or EP 2 693 290 A1. By turning a rotatable control element in the form of a rotary knob, a corresponding setting can be made or operation is performed. Task and solution

[0003] The invention is based on the object of creating a method as mentioned above and an electrical device designed to carry out this method, with which problems of the prior art can be solved and, in particular, a simple and advantageous operation of the electrical device is possible.

[0004] This object is achieved by a method having the features of claim 1 and by an electrical device having the features of claim 13. Advantageous and preferred embodiments of the invention are the subject of the further claims and are explained in more detail below. Some of the features are described only for the method or only for the electrical device. However, they are intended to be able to apply independently and independently of one another to both such a method and such an electrical device. The wording of the claims is incorporated into the content of the description by express reference.

[0005] In this method, the rotary control device of the electrical device's operating mechanism has a rotatable control element. This control element can be rotated in opposite directions, i.e., clockwise and counterclockwise. Depending on the rotational path and / or angle of the rotary control device or control element, a setting value can be changed or an operating mode for operating the electrical device can be selected. The control element does not necessarily have to be connected to the rotary control device via a rotary shaft; other signal transmission methods, such as those known from DE 10212954 A1 or DE 10 2006 054 764 A1, are also possible.

[0006] According to the invention, the electrical device can be operated in at least two different operating modes. An operating mode, but not necessarily every operating mode, can have a number of at least two setting values. These setting values, like the operating mode, can be selected by turning the rotary control. This also applies to selecting an operating mode for the operation of the electrical device. An operating mode can be selected from the group of power mode, temperature mode, fine adjustment mode, coarse adjustment mode, program mode, or the like. A setting value can be selected from the group of power levels or power levels that can be selected and set in a power adjustment, fine adjustment, or coarse adjustment mode. Such a fine adjustment or coarse adjustment mode can also be used to select and set temperature levels or temperatures.A temperature mode, i.e., more generally a temperature setting, can also be used for this. Furthermore, the group can have cooking programs, cooking programs, automatic programs, performance profiles or temperature profiles in a program mode or pause function, operating lock, child safety lock, which can also be selected as the aforementioned setting values. In a first or preceding step of the method, the operating mode is selected and set by a first rotation of the operating element from an off position or from a zero state in one direction of rotation or in the other, opposite direction of rotation, depending on the direction of rotation of the operating element. Advantageously, this operating mode can be selected from two possible operating modes, and the first selected direction of rotation determines which of these two operating modes is selected. It is particularly advantageous if the two operating modes are different.

[0007] At the same time, in the first step of defining the operating mode, an initial setting value is selected for this operating mode. This setting value then naturally corresponds to this operating mode. In subsequent steps after the first rotation of the control element in one direction or the other, this specified operating mode remains fixed and does not automatically change. Subsequent rotation in any direction cycles through the possible settings for this operating mode in order to select and specify a setting value for subsequent operation of the electrical device.

[0008] In simple terms, the invention can be described as follows: the first rotation of the control element in one direction or the other, i.e. the first direction of rotation after the start of the method, selects and, so to speak, establishes the operating mode. The operating mode can be changed further by further rotation or by turning back. The operating mode is then selected and established, usually by stopping the control element. After the operating mode has been established, a setting value can be selected from a group of possible setting values for this operating mode, again by turning the control element. Thus, it can advantageously be provided that, in a hob, a power mode is selected as the operating mode by turning the control element in one direction, for example, low boiling, medium boiling, high boiling, or the like.However, if the control element is turned in the opposite direction from a neutral or off position, different power levels for the cooking zone can be set in a power mode while a program mode was previously selected. After the first rotation of the control element in one direction or in the other opposite direction, the respective operating mode, i.e., either program mode or power mode, remains active, regardless of whether the control element is rotated in one direction or the other. This rotation serves to select a corresponding setting from the respective operating mode.

[0009] Advantageously, the two initially selectable operating modes can be fundamentally different, for example, one for a power setting and another for a program mode. This allows different settings to be made quickly.

[0010] Alternatively, the two initially selectable operating modes can be of essentially the same type, i.e., both for a power setting, for example. One can then be a fine-tuning mode, the other a coarse-tuning mode.

[0011] In one embodiment of the invention, it can be provided that the setting of the operating mode is canceled as soon as the control element is turned to the off position for a predetermined time, or as soon as a selected program from the program mode has ended. Even if the entire electrical device is put into an off state, i.e. switched off, the setting of the operating mode is canceled. In this way, in particular by turning the control element to the off position for a predetermined time, an operating mode that is possibly no longer desired or has been incorrectly selected can be deleted. Such a predetermined time can be in the range of a few seconds, for example between 0.5 seconds and 10 seconds, in particular between 1 second and 5 seconds.

[0012] In a further embodiment of the invention, it can be provided that the setting value within the previously defined operating mode can always be changed by rotating the control element. By rotating the control element in this way, regardless of whether the rotation is in one direction or the other, a new setting value can be set in this operating mode. This is particularly advantageous in the case of an operating mode for setting a power output. A setting value in this operating mode can advantageously be selected and set in the same way as the first time, advantageously by rotating the control element to a specific position corresponding to the desired new setting value and then leaving it there.

[0013] In an advantageous embodiment of the invention, it can be provided that after the first rotation of the control element in one of the two rotational directions and after the subsequent selection and definition of an operating mode or selection of a setting value, a specific rotational position or a specific rotational angle range is provided by the method again leaving the selection of an operating mode or the definition of a setting value. In this way, an incorrect operation can be canceled or corrected. The time for remaining in the specified rotational position or in the specified rotational angle range can be between 0.5 seconds and 10 seconds, advantageously between 1 second and 5 seconds.

[0014] As an alternative to the aforementioned possibility, an additional control element on the control device can be operated to select and specify an operating mode or to specify a setting value after setting by turning. This can then be a selection or confirmation control element, so to speak. The additional control element responsible for this can be arranged on the control element of the rotary control device or separately on the control device. For example, it can be a general additional control element that is responsible for or can operate several rotary control devices of the control device that can be designed and operated according to the invention.

[0015] In a similar way to the previously defined method for selecting and setting, a corresponding additional control element on the control device can also be operated to exit the selection of an operating mode or to set a setting value. This additional control element can also be arranged on the rotatable control element itself or separately from it on the control device. It can be the aforementioned selection or confirmation element. Alternatively, it can also be designed separately as a delete or cancel control element.

[0016] As an alternative to selecting and specifying an operating mode or setting value, as well as exiting or canceling it, each using an additional control element, it can be provided that a setting value or an operating mode is specified by the control element remaining in a specific rotary position corresponding to this setting value for more than 0.5 seconds. Advantageously, the time can even be more than 3 seconds, particularly advantageously a maximum of 10 seconds or even only a maximum of 5 seconds. The electrical device can then be operated with this setting value as soon as the specification has been made, in this case as soon as the corresponding time has elapsed.

[0017] In a further development of the invention, it can be provided that when rotating the control element, a change in operating mode or the changing, increasing, or decreasing of a setting does not depend exclusively on the rotational distance traveled or a rotational angle covered. Advantageously, this can also depend on a rotational speed, i.e., it can occur at different speeds depending on the rotational distance or rotational angle covered. Particularly advantageously, a greater change can occur at higher rotational speeds than at lower rotational speeds. A linear relationship can be provided here, or alternatively, a progressive relationship, i.e., a change that is significantly more than twice as high or greater can occur at twice the rotational speed.

[0018] In a further development of the invention, it can be provided that, upon first turning the control element in one direction, various operating modes of the electrical device provided with the control device can be selected. The selection of an operating mode or a setting value can then be confirmed by turning the control element in the opposite direction, possibly after a short pause. Following this actuation, a setting value can then be decreased or increased again by turning in one direction or in the opposite direction. This direction of rotation can be varied as desired. The setting of this setting value is always retained; the operating mode itself is therefore no longer changed.The electrical device equipped with the control device can then be started by not turning the control element for a period of at least 0.5 seconds or at least 3 seconds, preferably up to a maximum of 10 seconds or up to a maximum of 5 seconds.

[0019] In one embodiment of the invention, the power of a heating device of the electrical appliance can be adjusted in one operating mode in both directions of rotation. In one direction of rotation, a power level can be set as a numerical value or as a proportion of the maximum power for the heating device. In the other direction of rotation, a temperature to be achieved with the heating device can be set. This can be done either entirely or partially as a numerical value, or alternatively as a qualitative value such as "parboil," "sear," "continue cooking," or "keep warm."

[0020] In yet another possible embodiment of the invention, it can be provided that when the control element is rotated at a rotational speed that exceeds a predetermined rotational speed limit, the power of all active heating devices of the electrical device is reduced or even switched off. It may also be possible to switch off the entire electrical device. This then serves as a type of alarm function or emergency stop. Such a rotational speed limit can be approximately one rotation per second or even higher. Furthermore, it can be provided that a certain rotational angle range must be simultaneously and additionally exceeded for this to happen. Such a rotational angle range can be 180° or at least 90°. This serves as an additional safeguard to ensure that this function is not performed accidentally or inconsistently with the actual operating process or operation of the electrical device.

[0021] Advantageously, the aforementioned function can also apply only to a specific angle of rotation that exceeds a predetermined angle of rotation range. Such an angle of rotation range can be between 90° and 360°, preferably between 90° and 180°. In this case, a previously described rotation speed that exceeds a certain rotation speed limit may also be necessary.

[0022] These and other features emerge not only from the claims but also from the description and the drawings. The individual features may be implemented individually or in combination in an embodiment of the invention and in other fields, and may represent advantageous and individually protectable embodiments for which protection is claimed here. The division of the application into subheadings and individual sections does not limit the generality of the statements made therein. Brief description of the drawings

[0023] Embodiments of the invention are illustrated schematically in the drawings and explained in more detail below. The drawings show: Fig. 1 a schematic sectional view through an electrical device according to the invention with an operating device with a rotary operating device including a rotatable operating element, Fig. 2 a plan view of an operating device according to Fig. 1 with different power levels, which can be adjusted by turning the control element to the left in a fine adjustment mode and to the right in a coarse adjustment mode, Fig. 3 a further plan view of a control device according to Fig. 1with a control element, the turning of which to the right selects a power level in the usual way and the turning of which to the left selects one of several programs for heating up a cooking zone, Fig. 4 a further modification of a control device according to Fig. 1 with a control element, which can be turned to the right in a similar way to Fig. 3 a power level as a numerical value and turning it to the left selects a preset temperature, and Fig. 5 shows a further embodiment of an operating device according to Fig. 1 , in which turning a rotary control element to the right results in a usual selection of a power level, and turning it to the left selects one of several programs with a safety function, Fig. 6 a program sequence for the Fig. 4 , how turning the control element to the left or right moves one step forward or one step back. Detailed description of the implementation examples

[0024] In the Fig. 1 is a schematic side view in section through a hob 11 as an electrical appliance according to the invention. The hob 11, which is only shown in detail here, has a hob plate 13 with a top side 14 and a bottom side 15. A heating device 17, which can be pressed against the bottom side 15 of the hob plate 13, is arranged below the hob plate 13 (shown on the right). This heating device can in principle be of any type, for example it can be a radiant heating device or an induction heating device. Any number of these can in principle be provided. A power supply 18 is provided for the heating device 17, which is specifically tailored to it. The power supply 18 can possibly also supply power to or control other heating devices of the hob 11.

[0025] The hob 11 has an operating device 20 with which it can be operated and, in particular, the operation and power of the heating device 17 can be adjusted. The operating device 20 has a controller 22, advantageously a microcontroller. This can be provided for the entire hob 11, as here, and can therefore also control the power supply 18 to operate the heating device 17 in accordance with input commands.

[0026] The operating device 20 comprises, on the one hand, a rotary control device 24, of which several can also be provided on the cooktop 11. The rotary control device 24 is not a single structural unit or a single housing, but consists of several functional units. The rotary control device 24 has two Hall sensors 26a and 26b, which are offset from one another or spaced apart on the underside 15 of the cooktop plate 13. They can, but do not necessarily have to, rest on the underside 15. Furthermore, a holding magnet 28 is provided below the cooktop plate 13, which advantageously rests on the underside 15, but this is not mandatory.

[0027] Above the holding magnet 28 and the Hall sensors 26a and 26b, a rotary knob 30 is provided as the aforementioned rotatable control element. It is removably mounted and supported and can be rotated. For this purpose, the rotary knob 30 has a knob housing 31 and, within it, a centering magnet 33. This interacts with the holding magnet 28, forming a kind of magnetic rotation axis, which is known from the prior art according to EP 797 227 A2. In this way, the rotary knob 30 is held and centered even during rotation.

[0028] Furthermore, signal magnets 34 are arranged in the toggle housing 31 at a distance from the centering magnet 33, which are then moved in a circular path over the two Hall sensors 26a and 26b when rotated. By moving due to the rotation of the rotary toggle 30, the Hall sensors 26a and 26b detect this rotation and a corresponding angle of rotation and path of rotation. For this purpose, a plurality of such signal magnets 34 can be provided in the toggle housing 31. Alternatively, this can also be achieved by other means that generate a locally different magnetic field. Not shown, but also advantageously provided, is a type of magnetic locking device, as is also known from the prior art mentioned above. Locking distances can be assigned to defined rotation angle ranges and correspond, for example, to 10°, 15°, or 30°.

[0029] To the right of the rotary control device 24, an additional switch 36 is located on the underside 15 of the hob plate 13, which is also connected to the control unit 22. This additional switch can advantageously be formed by a capacitive sensor element that can be actuated by placing a finger on the upper side 14 of the hob plate 13. This is also known from the prior art, see, for example, EP 859 467 A1.

[0030] In the Fig. 2 to 5Schematically similar processes are shown, such as how, by turning the rotary knob 30 either clockwise or counterclockwise, the control device 20 can be switched to a different operating mode, where a selection and, if necessary, a determination is made, and subsequently also setting values. The recognizable numbers or letters are of course not printed on the upper side 14 of the hob plate 13, and are actually not visible in any way either; they only correspond to the individual operating modes or setting values that are reached when a certain rotation position is reached or after traveling a certain rotation path or angle. They can advantageously be shown on a display 38 arranged next to the rotary knob 30, either as a seven-segment display or as a display for a detailed representation.

[0031] If the rotary knob 30 is first turned clockwise, i.e. to the right, a power mode can be selected as the operating mode, for example starting from an off state of the heating device 17. Within this power mode, power levels can then be selected or set in the order 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, P1 and P2. P1 and P2 are particularly high power levels or so-called booster levels. This operating mode is therefore for a normal power setting. For every 30° angle of rotation to the right, the power level is increased by one, or, if turned to the left, decreased by one. The gradation of the actual power levels corresponding to the power levels is not linear, but this is known and is not important here.

[0032] Because the first turn of the rotary knob 30 was to the right, the operating mode is selected as the power mode, and then power levels are set according to a specific pattern within this power mode. Subsequent turning clockwise or counterclockwise does not change this at first; only the named and shown power levels 0 to P2 can be set. Once a desired power level has been set, which can be shown on the display 38, this can be automatically adopted for subsequent operation of the heating device 17 by means of the power supply 18 either after a specific period of time between 0.5 seconds and 10 seconds or between 1 second and 5 seconds. Alternatively, the additional switch 36 can be actuated as a takeover so that operation of the heating device 17 begins immediately at this power level.

[0033] This power mode operating mode can be exited, for example, by returning the rotary knob 30 to the zero position. Alternatively, the zero state can be set using another auxiliary switch or by repeatedly pressing the auxiliary switch 36.

[0034] If, however, the rotary knob 30 is first turned counterclockwise, i.e. to the left, a fine adjustment mode is selected as the operating mode. In this fine adjustment mode, a power level can be set just like in the power mode, but with finer increments or in a different range. In this fine adjustment mode, the displayed power levels W1, W2, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5 and 5 are cycled through. The power levels W1 and W2 are, almost mirrored to the booster levels P1 and P2, two different keep-warm levels with very low power and low power for keeping a pot warm, including the food inside, placed above the heating device 17 on the hob plate 13. Thus, in this fine adjustment mode, a power level can be set with finer increments, especially in the lower range where a finer adjustment makes a greater difference.As previously described for the normal power setting operating mode, the corresponding power level value can also be set within the fine adjustment mode by turning the rotary knob 30 to the left or right. This value is currently shown on the display 38. This value can then be set using the additional switch 36 or by timing and adopted for the operation of the heating device 17.

[0035] In the Fig. 3Further options are shown in simplified form. If the rotary knob 30 is first turned clockwise, a power mode is selected and set as the operating mode. Different power levels can be set by turning left or right in the order W, 1, 2, 3, 4, 5, 6, 7, 8, 9, and P. W is a single warming level with particularly low power, while P is a single booster level with particularly high power. This setting is therefore slightly different from the one previously described.

[0036] If the rotary knob 30 is first turned counterclockwise, a program mode is selected and set as the operating mode. Within this program mode, different cooking programs can be selected as setting values by turning left or right. In this exemplary embodiment, these cooking programs are at least partially arranged by ascending power level, but this is not necessary. The order is low boil, medium boil, high boil, sear, pasta water, egg boil, CSF7, CSF8, CSF9, CSF10, and CSF11. The setting values CSF7 to CSF11 can be freely programmed.

[0037] Even in the procedures according to Fig. 3 The corresponding setting values can be displayed on a display (not shown). The setting is made using the additional switch 36 (not shown).

[0038] In the Fig. 4Another possibility for different operating modes is shown. If the rotary knob 30 is first turned clockwise, a power mode is selected and set as the operating mode with power levels as setting values that correspond to those of the Fig. 3 They are also configured exactly as described there.

[0039] If, however, the rotary knob 30 is first turned counterclockwise to the left, a temperature mode is selected and set as the operating mode. Within this temperature mode, different temperatures or temperature levels can be selected and set. These run in the following sequence: 40°C, 60°C, 80°C, 100°C, 120°C, 140°C, 160°C, 180°C, 200°C, 220°C, and 240°C. Thus, eleven different rotary positions are available for specific values other than zero, with the increase occurring in steps of 20°C. In this way, temperature-controlled cooking can be achieved using the heating device 17. A temperature sensor is also required for this, but this is known from the prior art; it can be arranged in a pot, for example. Especially with this temperature mode, it is obviously also possible to provide for a non-linear setting.For example, 60°C could be selected as the first temperature level, but then a finer subdivision could be provided in the lower temperature range. For example, 10°C levels could be provided at least in some areas, which would then, of course, have corresponding locking levels.

[0040] In the Fig. 5 Another example is shown for different operating modes. If the rotary knob 30 is first turned clockwise, the Figs. 3 and 4 A power mode is selected as the operating mode. Different power levels can then be set in this mode.

[0041] If the rotary knob 30 is first turned counterclockwise, special functions such as child safety lock, operating lock, pause function, and wipe protection can be set in a program mode as the operating mode. Switching off is also possible in the fourth rotary position. Here, too, the additional switch 36 can be operated to select and start the set value or the corresponding program.

[0042] In the Fig. 6 is based on the example of Fig. 4A type of flow chart for the method according to the invention is shown once again. Starting from the zero position with an off state as the zero state, a first turn of the rotary knob 30 to the right (as R) leads to the power mode as the operating mode, which here represents a type of right-hand branch. The first turn to the right sets a power level W. A further turn to the right sets power level 1, and so on. A turn starting from power level W to the left (as L) sets the off state again.

[0043] If you keep turning the knob to the right, you will eventually reach booster level P. From here, you can turn the knob to the left to reduce the power level. From here, you can turn the knob to the right again, as shown in the figure. Fig. 4 can be detected, the off state is set again or the cooking zone is switched off.

[0044] This can be done in reverse for the temperature mode as the operating mode, which is selected by first turning the rotary knob 30 to the left, simultaneously with the first setting value of 40°C. By continuing to turn it to the left, the set temperature increases in 20°C increments up to a temperature of 240°C. Turning it further to the left then returns the device to the off state.

[0045] From the Fig. 6 It can also be seen that switching from one operating mode to the other is only possible by passing through the off state. Alternatively, this off state could of course also be achieved in other ways, for example, by using another auxiliary switch. However, doing this by turning the rotary knob 30 is considered easier.

Claims

1. A method for operating an electrical device with a rotary control device of an operating device, wherein the rotary control device has a rotatable operating element which can be rotated in opposite directions of rotation, wherein a setting value can be changed or operating modes for the operation of the electrical device can be selected depending on a rotational path and / or angle of rotation of the rotary control device or the operating element, characterized in that: - the electrical appliance can be operated in at least two different operating modes, which can be selected using the rotary control device, - an operating mode has a number of at least two setting values that can be selected using the rotary control device, preferably each operating mode, - wherein an operating mode can be selected from the group: power mode, temperature mode, fine adjustment mode, coarse adjustment mode, program mode, or the like, - wherein setting values can be selected from the group: + power levels or powers in a power, fine adjustment, coarse adjustment mode; + temperature levels or temperatures in a temperature, fine adjustment or coarse adjustment mode; + cooking programs, cooking programs, automatic programs, power profiles, temperature profiles in a program mode, pause function, operating lock, child lock;- wherein in a first step the operating mode is selected and set by a first rotation of the control element from an OFF position or from a ZERO state in one direction of rotation or in the other direction of rotation depending on the direction of rotation of the control element, wherein different operating modes can be selected in different directions of rotation, - wherein at the same time as the operating mode is set in the first step a first setting value for this operating mode is selected, - wherein in subsequent steps after the first rotation of the control element in one of the two directions of rotation this set operating mode remains set and a subsequent rotation in any direction of rotation goes through the possible setting values of this operating mode to select and set a setting value for a subsequent operation of the electrical device.; 2. Method according to claim 1, characterized in thatthe operating mode is canceled as soon as the control element is turned to the OFF position for a predetermined time, or as soon as a selected program from the program mode is completed, or as soon as the entire electrical appliance is put into an OFF state.

3. Method according to claim 1 or 2, characterized in that a setting of the setting value within the defined operating mode can always be changed by turning the control element and thus setting a new setting value in this operating mode, preferably in the same way and in the same manner as the first time.

4. Method according to one of the preceding claims, characterized in thatafter the first rotation of the control element in one of the two directions of rotation and the subsequent selection and definition of an operating mode or selection of a setting value, there is a specific rotational position or a specific rotational angle range in which, preferably if the control element remains in this rotational position or in this rotational angle range for more than a time between 0.5 seconds and 10 seconds, the process again leaves the selection of an operating mode or the definition of a setting value.

5. Method according to one of the preceding claims, characterized in that To select and specify an operating mode or to specify a setting value, an additional control element on the control device is operated.

6. Method according to one of the preceding claims, characterized in that To exit the selection of an operating mode or the definition of a setting value, an additional control element on the control device is operated.

7. Method according to one of claims 1 to 4, characterized in that the setting of a setting value is effected by the control element remaining in a specific rotary position corresponding to this setting value for more than 0.5 seconds, preferably for more than 3 seconds, whereby in particular the electrical device is operated with this setting value as soon as the setting has been made.

8. Method according to one of the preceding claims, characterized in that When turning the control element, changing the operating mode or increasing or decreasing a setting value does not depend exclusively on the travelled rotational distance or the angle of rotation covered, but also on the rotational speed.

9. Method according to claim 8, characterized in that at higher rotational speeds, a greater change occurs per angle or distance travelled than at lower rotational speeds.

10. Method according to one of the preceding claims, characterized in that in one operating mode, the power of a heating device can be adjusted in both directions of rotation, whereby in one direction of rotation a power level can be adjusted as a numerical value for the heating device and in the other direction of rotation a temperature to be achieved with the heating device can be adjusted.

11. Method according to one of the preceding claims, characterized in that If the control element is rotated at a speed that exceeds a predetermined speed limit, all active heating devices are reduced in power or switched off, or the entire electrical device is switched off.

12. Method according to one of the preceding claims, characterized in thatIf the control element is turned at an angle that exceeds a predetermined angle range, all active heating devices are reduced in power or switched off, or the entire electrical device is switched off.

13. Electrical appliance with an operating device having at least one rotary operating device, wherein the rotary operating device has a rotatable operating element which can be rotated in opposite directions of rotation, wherein a setting value can be changed or operating modes for the operation of the electrical appliance can be selected depending on a rotational path and / or angle of rotation of the operating element, characterized in that the operating device is designed to carry out the method according to one of the preceding claims.

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