EP2592899B1 - Domestic appliance - Google Patents

Description

The invention relates to a household appliance device according to the preamble of claim 1.

From the publication DE 195 46 853 A1 a household appliance device with an annular coupling coil is known, which is arranged coaxially around a circular heating coil and which is provided to provide a lighting unit inductively with energy.

From the publication EP 1 317 164 B1 is a home appliance device with a coupling coil known, which is applied in the form of a conductor on a circuit board. The board is designed as a circular ring sector, so that a plurality of such boards can be arranged around a circular disk-shaped heating coil. The coupling coils are provided to provide a lighting unit inductively with energy.

The object of the invention is, in particular, to provide a generic household appliance device with an advantageously small footprint. The object is achieved by the characterizing feature of claim 1, while advantageous embodiments and modifications of the invention can be taken from the dependent claims.

The invention is based on a household appliance device with at least one heating coil and at least one coupling coil.

It is proposed that the heating coil at least partially surrounds the coupling coil. A "coil" is to be understood in this context, an electrical conductor having at least one turn. Preferably, the conductor has several turns. Under an "electrical conductor" in this context, in particular both a electrical single conductor as well as a Litzenleitung several mutually insulated individual conductors, a so-called high-frequency Litzenleitung understood. A "heating coil" is to be understood as a coil which is intended to be traversed by a high-frequency alternating current of a frequency of at least 1 kHz, in particular of at least 10 kHz and advantageously of at least 20 kHz, and preferably at least partially by means of induced alternating currents ferromagnetic body, preferably an at least partially ferromagnetic cookware, to heat. By "provided" is to be understood here and below in particular specially designed and / or equipped and / or programmed. Preferably, the heating coil is at least largely annular disk-shaped. In particular, the heating coil is intended to provide a maximum heating power of at least 500 W, in particular of at least 750 W, preferably of at least 1000 W and particularly advantageously of at least 1500 W. The heating coil is preferably operated with a voltage amplitude which deviates from a voltage amplitude of a mains voltage by at most 10%, in particular at most by 5% and preferably at most by 1%. The heating coil is in particular part of an induction heating unit which, in addition to the heating coil, additionally has, in particular, at least one ferrite element and / or at least one support unit for the heating coil.

A "coupling coil" is to be understood in this context as a coil which is intended to receive electromagnetic energy. Preferably, the electrical conductor of the coupling coil is coated with an insulating layer, preferably an electrically insulating lacquer. Preferably, the coupling coil is formed differently from a heating coil. The heating coil preferably induces a current in the coupling coil in at least one operating state. The coupling coil may in particular be part of a coupling unit, which in addition to the coupling coil additionally comprises in particular at least one support element for the coupling coil. In particular, the coupling unit itself may be part of the induction heating unit. Furthermore, at least one ferrite element can be provided within the coupling coil. Under that, that "the Heating coil, the coupling coil at least partially surrounds ", it should be understood that in at least one mounted state at least one emanating from a center of gravity of the heating coil beam exists, which passes after passing through at least a portion of the coupling coil again in at least a portion of the heating coil.

By such a configuration, a generic household appliance device can be provided with an advantageously small footprint. In particular, when used in a matrix hob, a high coverage of a cooking plate with heating coils can be achieved. In this case, a "matrix cooktop" should be understood to mean, in particular, a cooktop in which the heating units are arranged in a regular grid under a cooktop panel and a region of the cooktop panel which can be heated by means of the heating units is preferably at least 60%, in particular at least 70%, advantageously at least 80 % and particularly advantageously comprises at least 90% of a total area of the hob plate. In particular, the matrix cooktop comprises at least 8, in particular at least 10, advantageously at least 20 and particularly advantageously at least 30 heating units. Furthermore, an electrical consumer unit, in particular a lighting unit, can be supplied with power without load for a power supply which is provided at least for a power supply to an electronics unit of a domestic appliance, in particular an induction hob. By using a coupling coil, an advantageously small and inexpensive power supply for the power supply of the electronics unit of the household appliance can be maintained. In particular, a power consumption of the electrical consumer unit may exceed a maximum power output of the power supply. As a result, the same power supply can be used in various household appliances, wherein in such household appliances, which have an additional electrical consumer unit, in particular a lighting unit for marking active heating zones and / or for decoration purposes, the energy required for this purpose is provided inductively via the coupling coil can be. As a result, costs can advantageously be reduced.

Advantageously, the heating coil completely surrounds the coupling coil. Including that "the heating coil completely surrounds the coupling coil", should be understood in particular that in any mounted state for each vertical projection of the heating coil and the coupling coil on any plane an outer edge of the projection of the heating coil an outer edge of the projection of the coupling coil completely encloses. As a result, a space requirement can be further reduced advantageous.

In a preferred embodiment of the invention, it is proposed that a Heizspulenfläche the heating coil and a coupling coil surface of the coupling coil are arranged at an angle of at most 45 °. A "coil surface" is to be understood in this context, in particular a surface which is bounded by an outer edge line of a vertical projection of a coil on a plane, wherein the plane is arranged perpendicular to a direction of a maximum magnetic field of the hypothetical DC through-flow coil. A "heating coil surface" is to be understood in particular a coil surface of the heating coil. A "coupling coil surface" is to be understood in particular a coil surface of the coupling coil. Under that two coil surfaces "are arranged at an angle of at most 45 °," should be understood in particular that a smallest angle between a surface normal of the coupling coil surface and a surface normal of the Heizspulenfläche is not more than 45 °. Preferably, the Heizspulenfläche and the coupling coil surface are arranged at an angle of at most 20 °, in particular of at most 10 ° and preferably of at most 5 ° and particularly advantageously in parallel. As a result, an advantageous energy transfer can be achieved.

In a particularly preferred embodiment of the invention, it is proposed that the heating coil and the coupling coil are arranged at least substantially concentrically. Under that "the heating coil and the coupling coil are arranged at least substantially concentric" should be understood in particular that a center of gravity of the coupling coil and the center of mass the heating coil by at most 20%, in particular by a maximum of 10%, preferably by at most 5% and more preferably by a maximum of 1% of a longitudinal extent of the coupling coil are spaced. A "longitudinal extent" is to be understood in particular a largest extent of the coupling coil surface. In this context, an "extension" of an element should be understood as meaning in particular a maximum distance between two points of a vertical projection of the element onto a plane. As a result, a low space requirement can be achieved particularly advantageous. Furthermore, a particularly advantageous energy transfer can be achieved. In a further embodiment of the invention, it is proposed that at least one longitudinal extension of the coupling coil parallel to a coupling coil surface of the coupling coil is at least twice as large as at least one transverse extension of the coupling coil that is perpendicular to the longitudinal extension and parallel to the coupling coil surface. Preferably, the same facts also apply to the Heizspulenfläche the heating coil. A "transverse extension" is to be understood to mean, in particular, an extension of the coupling coil surface in a direction perpendicular to the longitudinal extent. Preferably, the coupling coil surface is at least substantially oval-shaped. By "at least substantially oval-shaped" should be understood in this context in particular a surface shape, which differs from an oval only to a surface portion of at most 30%, in particular of at most 20%, preferably of at most 10% and more preferably of at most 5%. In this way, a particularly space-saving design can be achieved, in which nevertheless a sufficiently large coupling coil surface can be provided.

According to the invention, the domestic appliance device comprises at least one consumer unit which is supplied with energy in at least one operating state by the coupling coil. In this context, a "consumer unit" is to be understood as meaning an electrical unit which converts an energy delivered by the coupling coil into an electrical energy and / or into another form of energy. Preferably, the electrical consumer unit intended to emit electromagnetic waves and / or sound waves and / or to generate heat and / or work and / or to operate other electrical consumers. As a result, an energy provided by the coupling coil can be used advantageously, which can advantageously increase operating convenience. Since the power required for this is supplied by the coupling coil, can be dispensed with an increase in power of a power supply. Advantageously, a switch controlled by a control and / or regulating unit of the domestic appliance can be provided, which is provided to interrupt a power supply to the electrical load unit as a function of at least one operating state of the domestic appliance. Advantageously, the electrical consumer unit comprises at least one lighting unit. A "lighting unit" is to be understood in particular an electrical consumer unit which is intended to emit visible light. In particular, the lighting unit is intended to illuminate parts of the domestic appliance, in particular parts of a hob plate and preferably a glass ceramic hob plate. Advantageously, the illumination unit comprises at least one light source, in particular a light-emitting diode. In this way, an advantageous optical feedback can be achieved via an operating state of the domestic appliance, in particular a heating unit having the heating coil. Preferably, the illumination unit comprises a plurality of light-emitting means, in particular a plurality of light-emitting diodes, which are advantageously connected so that each current direction delivered by the coupling coil can be used to emit visible light. Advantageously, the illumination unit is provided to make an outline of the heating coil by illumination identified. As a result, ease of use can be increased particularly advantageous.

If the consumer unit comprises at least one power converter unit and / or one energy storage unit, an advantageously uniform energy supply for at least one unit of the consumer unit can be achieved. In particular, fluctuations in the induction voltage can be compensated and it can be an at least largely constant voltage for the unit the consumer unit are provided, in particular even if the heating coil is operated pulsed. A "power converter unit" is to be understood, in particular, as a stationary unit for converting an electrical current, in particular an alternating current, into another current, in particular direct current. Preferably, the power converter unit comprises at least one electronic component, in particular a transistor, preferably an IGBT, and / or a diode. Preferably, the power converter unit is designed as a rectifier unit. An "energy storage unit" is to be understood in particular as a unit for the temporary storage of energy, in particular of electrical energy, for later use. Preferably, the energy storage unit comprises at least one capacitor unit. If the consumer unit additionally comprises a control unit for regulating an energy supply to the lighting unit, a light intensity can be advantageously adapted to at least one operating state of the heating coil.

Furthermore, a domestic appliance, in particular a cooking appliance, with a domestic appliance device according to the invention is proposed. Preferably, the cooking appliance comprises an induction heater. Preferably, the cooking appliance is designed as a hob and in particular as an induction hob. If the hob is designed as a matrix hob, the benefits of the invention are particularly advantageous advantage. Further advantages emerge from the following description of the drawing. In the drawing, two embodiments of the invention are shown. The drawing, the descriptions and the claims contain numerous features in combination.

Fig. 1

ein als ein Induktionskochfeld ausgebildetes Hausgerät mit einer Hausgerätevorrichtung in einer schematischen Draufsicht,

Fig. 2

einen Teil der Hausgerätevorrichtung aus Fig. 1 in einer schematischen Draufsicht,

Fig. 3

einen Teil der Hausgerätevorrichtung aus Fig. 1 in einer schematischen Schnittdarstellung entlang einer Linie III-III in Fig. 2,

Fig. 4

ein weiteres als ein Induktionskochfeld ausgebildetes Hausgerät mit einer alternativen Hausgerätevorrichtung in einer schematischen Draufsicht,

Fig. 5

einen Teil des Hausgeräts aus Fig. 4 in einer schematischen isometrischen Darstellung und

Fig. 6

eine Koppeleinheit und deren Anschluss an eine Verbrauchereinheit der Hausgerätevorrichtung aus Fig. 4 in einer schematischen isometrischen Darstellung.

Show it:

Fig. 1

a household appliance designed as an induction hob with a domestic appliance device in a schematic plan view,

Fig. 2

a part of the home appliance device Fig. 1 in a schematic plan view,

Fig. 3

a part of the home appliance device Fig. 1 in a schematic sectional view taken along a line III-III in Fig. 2 .

Fig. 4

another household appliance designed as an induction hob with an alternative domestic appliance device in a schematic plan view,

Fig. 5

a part of the household appliance Fig. 4 in a schematic isometric view and

Fig. 6

a coupling unit and its connection to a consumer unit of the home appliance device Fig. 4 in a schematic isometric view.

FIG. 1 shows a trained as a cooking appliance 32a home appliance 30a. The cooking appliance 32a is a hob 34a, which is provided for inductive heating of cooking utensils placed on a hob plate 36a of the cooking hob 34a (not shown). The hob plate 36a is preferably made of a glass ceramic. On the hob plate 36a heating zones 38a are marked in a known manner, of which in Fig. 1 only one is designated. The hob 34a comprises household appliance devices 28a according to the invention, of which in Fig. 1 again only one is designated. Each home appliance device 28a includes at least one induction heating unit 39a below the cooktop panel 36a associated with a heating zone 38a.

FIG. 2 shows a part of the home appliance device 28a in a plan view. The induction heating unit 39a has a heating coil 10a and a coupling coil 12a (see FIG. Fig. 3 ). In the present case, the induction heating unit 39a has exactly one heating coil 10a. However, it is also conceivable that an induction heating unit comprises two or more heating coils, in particular for the formation of heating zones of variable diameter. Further, the induction heating unit 39a more, in FIGS. 2 and 3 not shown assemblies, in particular at least one ferrite element and at least one support unit for the heating coil 10a. The heating coil 10a is formed annular disc-shaped. A Heizspulenleiter 40a of the heating coil 10a is held by the carrier unit, not shown. The Heizspulenleiter 40a comprises a plurality of mutually insulated individual lines 41a, of which Fig. 3 only one is designated, which in particular can be twisted against each other and which form a high-frequency stranded wire. In alternative embodiments, a Heizspulenleiter may include only a single conductor. The heating coil conductor 40a further comprises an electrically insulating outer shell 42a. The coupling coil 12a is also formed annular disc-shaped. An electrically insulated coupling coil conductor 43a of the coupling coil 12a is wound on a support element 44a of the induction heating unit 39a (cf. Fig. 3 ). A winding number of the coupling coil 12a is six in the present case. The carrier element 44a is preferably made of plastic. The carrier element 44a is at least substantially cylindrical jacket-shaped. The carrier element 44a comprises two mutually opposite holding webs 46a, between which the coupling coil conductor 43a is arranged.

The heating coil 10a completely surrounds the coupling coil 12a (cf. Fig. 3 ). A heating coil surface 14a of the heating coil 10a and a coupling coil surface 16a of the coupling coil 12a are arranged at least substantially parallel to each other. Furthermore, the heating coil 10a and the coupling coil 12a are at least substantially concentric with each other (see. FIGS. 2 and 3 ).

The home appliance device 28a comprises an in Fig. 2 only schematically indicated consumer unit 22a, which is supplied in at least one operating state by the coupling coil 12a with energy. In operation of the induction heating unit 39a, the heating coil 10a is supplied with high-frequency alternating current through supply lines 47a. The heating coil 10a thereby induces an induction voltage in the coupling coil 12a. The induction voltage is tapped via connecting lines 48a on the coupling coil 12a. The consumer unit 22a has at least one power converter unit 24a and a Energy storage unit 26a on. The power converter unit 24a is a rectifier unit 49a. The energy storage unit 26a is a capacitor unit 50a. The induction voltage is rectified by the power converter unit 24a. The rectified induction voltage is smoothed in a known manner by means of the energy storage unit 26a. The consumer unit 22a further comprises a lighting unit 52a. The lighting unit 52a is provided to indicate an outline of the operated induction heating unit 39a for an operator. For this purpose, the lighting unit 52a comprises a multiplicity of lighting elements, preferably light-emitting diodes, which are arranged below the hob plate 36a along a circumference of the heating zone 38a. During operation of the induction heating unit 39a associated with the heating zone 38a, the circumference of the heating zone 38a is illuminated by the lighting unit 52a, so that it is immediately possible for an operator to see which heating zone 38a is in operation. It is ensured by the power converter unit 24a and in particular by the energy storage unit 26a that a constant power supply is available for the lighting unit 52a, even if the heating coil 10a is operated pulsed. Alternatively or additionally, a consumer unit may also have further electrical consumers, for example a loudspeaker unit or a display unit.

In Fig. 4-6 a further embodiment of the invention is shown. The following description is essentially limited to the differences between the embodiments, with respect to the same components, features and functions on the description of the other embodiment, in particular the description of Fig. 1-3 , can be referenced. To distinguish the embodiments, the letter a in the reference numerals of the embodiment in Fig. 1-3 by the letter b in the reference numerals of the embodiment according to Fig. 4-6 replaced. With respect to like-named components, in particular with regard to components with the same reference numerals, can in principle also to the drawing and / or the description of the embodiment according to Fig. 1-3 to get expelled.

FIG. 4 shows another, designed as a cooking appliance 32b home appliance 30b with alternative home appliance devices 28b, of which in Fig. 4 for clarity's sake only one is indicated. The cooking appliance 32b is a hob 34b, with induction heating units 39b arranged in a matrix-like manner below a hob plate 36b. To heat a cooking utensil, this can be placed on any mounting position on the hob plate 36b (not shown). By means of a method known to a person skilled in the art, the installation position is determined and the induction heating unit 39b situated below the installation position or the induction heating units 39b located below the installation position are operated to heat the cooking utensil.

FIG. 5 shows a schematic isometric view of a portion of the hob 34b, wherein the hob plate 36b has been omitted in a region above one of the induction heating units 39b. The induction heating units 39b each have a heating coil 10b whose heating coil surface 14b is oval. The induction heating units 39b furthermore each have a coupling unit 54b (cf. Fig. 6 ). The coupling unit 54b comprises a coupling coil 12b whose coupling coil conductor 43b is wound on a carrier element 44b of the coupling unit 54b. A parallel to a coupling coil surface 16b of the coupling coil 12b longitudinal extent 18b of the coupling coil 12b is at least twice as large as at least one perpendicular to the longitudinal extension 18b and parallel to the coupling coil surface 16b transverse extension 20b of the coupling coil 12b. The carrier element 44b is oval and tapered on both sides in the direction of the longitudinal extension 18b. A winding number of the coupling coil 12b is ten. In the present embodiment, the coupling coil 12b can be introduced into the heating coil 10b in a particularly space-saving manner. In particular, advantageously, a large surface area can be achieved for the coupling coil surface 16b, whereby a relatively large induction voltage can be induced in the coupling coil 12b.

FIG. 6 shows a schematic isometric view of the coupling unit 54b and its connection to a consumer unit 22b. Connecting lines 48b, by means of which the induction voltage is tapped at the coupling coil 12b, are led out of a region of the induction heating unit 39b in a cable duct 56b. The cable channel 56b is formed as a tubular member. The cable channel 56b is preferably made of plastic. At an end of the cable channel 56b facing the carrier element 44b, the latter comprises a joint extension 58b, which is held in a corresponding joint recess 60b of the carrier element 44b. The articular extension 58b is at least substantially cylindrical. Preferably, the articular process 58b is locked in the joint recess 60b. The cable channel 56b can be pivoted about a joint 62b formed by the joint extension 58b and the joint recess 60b and can thus be brought into a desired rotational position in particular. In the vicinity of the joint extension 58b, the cable channel 56b comprises a passage for the connection lines 48b (in FIG Fig. 6 not shown).

The consumer unit 22b comprises a lighting unit 52b by means of which the active induction heating units 39b are marked in an operating state on the hob plate 36b. The illumination unit 52b comprises a plurality of illumination elements, which are arranged in particular along an outer edge of the heating coil surface 14b (not illustrated). Thus, an optical identification of the heating coils 10b active in the operating state can be achieved particularly advantageously. reference numeral 10 heating coil 54 coupling unit 12 coupling coil 56 Cabel Canal 14 Heizspulenfläche 58 Articular process 16 Coupling coil area 60 joint recess 18 longitudinal extension 62 joint 20 transverse extension 22 consumer unit 24 Converter unit 26 Energy storage unit 28 Home appliance device 30 household appliance 32 Cooking appliance 34 hob 36 Hotplate 38 heating zone 39 induction heating 40 Heizspulenleiter 41 Single line 42 outer shell 43 Coupling coil conductor 44 support element 46 holding web 47 supply line 48 connecting line 49 Rectifier unit 50 condenser unit 52 lighting unit

Claims (8)

1. Domestic appliance device with at least one heating coil (10a; 10b) and at least one coupling coil (12a; 12b) and with at least one load unit (22a; 22b), which, in at least one operating state, is supplied with energy by the coupling coil (12a; 12b), characterised in that the heating coil (10a; 10b) at least partially surrounds the coupling coil (12a; 12b), wherein at least one beam originating from a centre of mass of the heating coil (10a; 10b) exists in at least one assembled state, which, after passing through at least one subarea of the coupling coil (12a; 12b), once again runs in at least one subarea of the heating coil (10a; 10b).
2. Domestic appliance device according to claim 1, characterised in that the heating coil (10a; 10b) completely surrounds the coupling coil (12a; 12b).
3. Domestic appliance device according to one of the preceding claims, characterised in that a heating coil surface (14a; 14b) of the heating coil (10a; 10b) and a coupling coil surface (16a; 16b) of the coupling coil (12a, 12b) are arranged at an angle of at most 45°.
4. Domestic appliance device according to one of the preceding claims, characterised in that a centre of mass of the coupling coil (12a; 12b) and the centre of mass of the heating coil (10a; 10b) are arranged at a distance by at most 20% of a longitudinal extension of the coupling coil (12a; 12b).
5. Domestic appliance device according to one of the preceding claims, characterised in that the heating coil (10a; 10b) and the coupling coil (12a; 12b) are arranged at least essentially concentrically.
6. Domestic appliance device according to one of the preceding claims, characterised in that at least one longitudinal extension (18b) of the coupling coil (12b) that is parallel to a coupling coil surface (16b) of the coupling coil (12b) is at least twice as large as at least one transverse extension (20b) of the coupling coil (12b) that is vertical to the longitudinal extension (18b) and parallel to the coupling coil surface (16b).
7. Domestic appliance device according to one of the preceding claims, characterised in that the load unit (22a; 22b) comprises at least one converter unit (24a; 24b) and/or one energy storage unit (26a; 26b).
8. Domestic appliance (30a; 30b), in particular cooking appliance (32a; 32b), with a domestic appliance device according to one of claims 1 to 7.

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