EP2380397B1 - Household appliance for inductive transmission of energy - Google Patents

Description

The invention relates to a household attachment with a power coil for inductive tapping of energy from an electromagnetic excitation field, a household operating device for operating a household attachment with a power coil for generating the electromagnetic excitation field and a system comprising a household attachment and a household operating device.

For example, from DE 103 43 011 A1 . DE 10 2005 022 352 A1 . DE 10 2006 017 800 A1 and DE 10 2006 017 801 A1 A power transmission from a work zone of an operating device to an add-on device by means of inductive coupling is known. An inductive coupling is understood to mean the coupling of a primary coil of the operating device and a secondary coil of the add-on device via an alternating magnetic field which is generated by the primary coil and is tapped by the secondary coil. An induction voltage is generated in the secondary coil by means of the alternating magnetic field, which can be used to operate the attachment. The primary coil and secondary coil can also be regarded as two halves of a separable transformer, which is why this type of coupling and power transmission is also called "transformer coupling".

Out: Kiefer, A .; Reindl, LM, "Inductively Coupled Sensor / Actuator System for Closed-Loop Control Applications at High Temperatures and in Aggressive Environments", Sensors, 2007 IEEE, October 28-31, 2007, pages 1396 to 1399 , or off Kiefer, A .; Reindl, LM "Inductively Coupled Sensor / Actuator System for Digital Closed-Loop Control Applications at High Operating Temperatures", 2nd WSEAS Int. Conf. on CIRCUITS, SYSTEMS, SIGNAL and TELECOMMUNICATIONS (CISST'08), Acapulco, Mexico, January 25-27, 2008 , a sensor / actuator system for high-temperature applications is known in which the complete measuring electronics and the sensors are integrated in the actuator. The data transmission is implemented as a point-to-point "Power Line Communication" (PLC) between the sensor / actuator system and its control unit. A separable transformer serves as an inductively coupled, contactless connection for both power transmission and bidirectional PLC data, which enables a perfect hermetic seal.

Out JP 2003284264 A A contactless power supply system is known in which energy is transmitted from an operating device to an add-on device by means of transformer coupling via corresponding power coils. To detect the attachment, signals are transmitted to an opposite signal reception circuit of the operating device via a signal generation device of the attachment, which has an oscillating circuit.

US 3,742,178 A discloses an induction cooker with a working area which carries a food-containing cooking vessel which can be heated inductively by eddy current. The cooking vessel is heated by the induction coil. Furthermore, a temperature detection unit is described, which comprises a temperature sensor and a temperature reception unit. The temperature sensor is installed in the cooking vessel, while the temperature receiving unit is arranged away therefrom in the working area of the induction cooker. The temperature receiving unit receives temperature data from the temperature sensor via radio. The temperature sensor in the cooking vessel is supplied with current by the main field generated by the induction coil, specifically for this purpose the temperature sensor is operated electrically with a fraction of a radiated power. A power coil is only shown in connection with the induction cooker.

WO 2007/122049 A1 discloses an energy transmission unit comprising a primary unit, which has a field generating means which is provided for transmitting energy to a field receiving means of a secondary unit by means of a transmission field flow, and a detection means for detecting a secondary voltage parameter. In order to reduce the manufacturing costs in particular, it is proposed that the detection means be provided for detecting the secondary voltage parameter by means of a detection field flow linked to at least the detection means and the field receiving means. For this purpose, the primary unit has a power coil and a coil, which are arranged in a common recess in a coil core. In contrast, the coil core of the secondary unit has only one power coil.

It is the object of the present invention to provide a possibility for particularly space-saving and inexpensive data transmission between an attachment device and an operating device, which supplies the attachment device with power by means of transformer or inductive coupling.

This object is achieved by means of a household attachment, a household operating device and a system according to the respective independent claim. Preferred embodiments can be found in particular in the dependent claims.

The household attachment is electrically operated and has at least one coil, each with at least one turn ("power turn") for inductive tapping of energy from an electromagnetic excitation field ("power coil"). The power turns lie in a common power turn level. By means of the inductive tap, an induction voltage caused by the electromagnetic excitation field can be generated on the coil for the operation of the household attachment, which has at least one load as an electrical consumer. Such energy transfer to the household appliance is often referred to as transformer energy transfer or coupling. A load can be operated directly with an induction AC voltage. For this purpose, the power coil is connected to a resistance heating conductor for its electrical supply. In addition, a load can be operated after rectification with a DC voltage, e.g. B. electronics with a low-voltage DC voltage in the range of up to 50 V. The electromagnetic excitation field is preferably an alternating magnetic field.

The household attachment also has at least one coil, each with at least one turn (“signal turn”) for data transmission between the household attachment and an operating device (“signal coil”). The signal turns lie in a common signal turn level. The power winding level is essentially parallel to the signal winding level. This allows a particularly space-saving, in particular flat, and inexpensive data transmission unit (transmitter, receiver or transceiver) to be implemented with this signal coil. In contrast to the common data transmission via a combined power / signal coil, a simpler generation of a data signal and an easier reading of the data signal result.

The at least one power coil and the at least one signal coil of the household attachment have a common coil core or transformer core for data and power transmission. The at least one power turn is in a recess of the coil core is arranged and lies there in a power winding plane. The at least one signal turn of the signal coil is arranged in the same recess in the coil core as the signal coil.

The data transmission unit can be used as a transmitter, a receiver and / or z. B. be designed as a transceiver. A separate signal coil can then be provided for the transmitter and the receiver or for the transmission branch and the reception branch of the transceiver. Alternatively, a combined transmit / receive signal coil can be provided for this, which is preferred. In the case of a design for bidirectional communication between the household add-on device and the domestic operating device, the signal coil can thus serve as a transmit / receive signal coil, and in the case of unidirectional communication from the household add-on device to the household operating device as a transmit signal coil or receive signal coil. The implement advantageously has at least one transmitter for implementing a control circuit, while the operating device then has at least one receiver. The transmitter or transceiver of the attachment and the receiver or transceiver of the control gear are matched to one another so that they can communicate. In particular, the transmitter and the receiver can work with the same or the same data protocol (s) and use the same frequency band or frequency bands.

The at least one power coil is connected to the data transmission unit for its electrical supply. The data transmission unit can in particular be set up to be supplied with current by means of the induction current tapped off at the secondary coil, possibly after rectification. This means that the data transmission unit can only send if the attachment can draw energy from the transformer coupling. The energy can be stored in an optional energy store, e.g. B. a supercapacitor. To operate the data transmission unit, a switching regulator can be connected downstream of the power coil, which rectifies energy extracted from the power supply to a voltage level suitable for operating low-voltage components. Since the transformer coupling is typically a near-field or short-range coupling, the data transmission unit will only be able to work when the attachment is already close to the work zone. An effective vertical distance of the attachment from the working zone, within which there is preferably one for the operation of the data transmission unit sufficient power is still transmitted, less than 2 cm, preferably not more than 0.75 mm. A lateral offset, within which a power which is still sufficient for the operation of the data transmission unit is transmitted, is preferably not more than 3 cm.

The attachment can have at least one integrated circuit for processing data and for outputting and / or receiving data to or from the data transmission unit. The integrated circuit may e.g. B. process data, e.g. B. read, change, link, buffer, format, etc., and output this data or data derived therefrom to the data transmission unit for transmission to the operating device or received by the operating device via the data transmission unit. Data to be processed can be obtained from another unit, e.g. B. a sensor, delivered data or data stored in or on the integrated circuit, z. B. an identifier (serial number, etc.) or a property of the attachment. The data transmission unit can be at least partially integrated into the integrated circuit. This results in a particularly compact design. Alternatively, the data transmission unit is a component or assembly that is different from the integrated circuit.

The data transmission unit can have a modulator as a transmitter and a signal coil connected downstream of the modulator, a demodulator downstream of the signal coil as a receiver and / or a modem connected to the signal coil as a transmitter-receiver. Then the modulator, the demodulator and / or the modem may be integrated into the integrated circuit, but the signal coil may not.

The powered or powered top unit may independently send or receive data to the control gear, e.g. B. cyclically within predetermined time intervals, e.g. B. every 100 ms, whereby an optimal data rate can be set. In particular, measurement data, e.g. B. independently transmits a temperature, air humidity or pressure to the control gear, as this can prevent a memory overflow.

A household add-on device can in particular be any electrically operated device for treating food, such as a small household device (coffee machine, waffle iron, etc.) or cookware (pot, pan, etc.).

The household operating device (base station) has at least one work zone for operating an add-on device at the work zone, e.g. B. by essay on the work zone. For this purpose, the operating device has at least one coil per working zone, each with at least one power winding located in a power winding plane for generating an electromagnetic excitation field, in particular an alternating magnetic field, at the working zone (“power coil”). By means of the generation of an electromagnetic excitation field, an attachment device arranged at the working zone can be operated by means of inductive or "transformer" energy transmission or coupling. In the context of a hob, the work zone can also be referred to as a cooking zone, but the present invention is not restricted to this.

The household operating device can be present, for example, as a compact unit or can be equipped with at least one separate working zone which can be operated via a control device (common in the case of several working zones).

The household operating device also has at least one signal coil per working zone, each with at least one signal turn in a signal turn level, the power turn level being essentially parallel (i.e., exactly parallel or with insignificant deviations) to the signal turn level. This also makes it possible to implement a particularly space-saving, in particular flat, and inexpensive data transmission unit using this signal coil. The at least one signal coil is provided for data transmission between the household operating device and a household attachment.

The at least one power coil and the at least one signal coil of the household operating device also have a common coil core or transformer core for data and power transmission. The at least one power turn is arranged in a recess in the coil core and lies there in a power turn plane. The at least one signal turn of the signal coil is arranged in the same recess in the coil core as the signal coil.

The data transmission unit can also be a receiver, a transmitter and / or z. B. a transceiver. Then can a separate signal coil can be provided for the transmitter and the receiver or for the transmission branch and the reception branch of the transceiver. Alternatively, a combined transmit / receive signal coil can be provided for this, which is preferred.

In the case of the household attachment and the household operating device, the winding level of the respective power turns and signal turns can be the same or substantially the same, or can be offset with respect to one another. If the winding level is the same or essentially the same, no additional overall height is required. In the case of a staggered arrangement, the associated power turn (s) and the signal turn (s) can also be arranged one above the other, as a result of which a lateral expansion is minimized.

At least one power coil with at least one power turn each can be used, e.g. B. in the form of separate concentrically arranged turns. For simple control, however, a power coil is preferred which is designed as a spiral coil with one or more turns. The spiral coil can have continuously curved windings, angular windings or freely designed windings.

Since the power winding level and the signal winding level are parallel to one another, in particular even if the power winding level and signal winding level match, the at least one signal winding of the signal coil can circulate around the outside of the at least one power coil. The outside arrangement can in particular ensure a sufficient conductor length for a wide range of transmission frequencies even with only one turn. Alternatively, the at least one signal winding can circulate around the inside of the at least one power coil. With an internal arrangement, the number of turns may be increased to ensure a sufficient conductor length.

The at least one power coil and the at least one signal coil of a device can have a common coil core or transformer core for data and power transmission, which saves components in contrast to a separate arrangement. The coil core advantageously consists of an iron core, in particular a ferrite core. The ferrite core preferably has an outer diameter between 1 cm and 20 cm, especially between 6 cm and 15 mm. Alternatively, one of the coils or both coils can also be air coils. For a simple configuration of the coil core, the at least one power turn and the at least one signal turn are arranged in the same recess in the coil core. It is preferred to provide only one signal coil per device. A winding diameter of the coils can preferably be between 1 cm and 20 cm, in particular between 6 cm and 12 cm, especially between 8 cm and 10 cm.

The number of turns of a coil is not limited and can be, for example, between 1 and 100. A number of turns of a signal coil of one and / or a number of turns of a power coil between four and ten are preferred. The signal windings can advantageously consist of HF braid or enamelled wire, the power windings can advantageously consist of HF braid. The diameter of the conductor (e.g. HF strand 30 x 0.05) of the signal winding can advantageously be thinner than the diameter of the HF strand (e.g. HF strand 840 x 0.07) of the power winding. For simple arrangement and ensuring a maximum conductor length, it is preferred if the signal winding is guided along a side wall of the recess.

Non-return-to-zero or Manchester code methods (including a differential Manchester code method) are preferred as data transmission methods, but the invention is not restricted to this.

To suppress crosstalk between a power signal transmitted via the power coil and a data signal transmitted via the signal coil, it is preferred if a minimum frequency of the power signal or the data signal is at least ten times higher than a maximum frequency of the data signal or the power signal. The signal winding can preferably be operated in the MHz range or higher, preferably in the range from a frequency of 4 MHz or z. B. at a frequency in the frequency range between 4 MHz and 32 MHz.

To avoid heating of the attachment, it is preferred if a power of not more than 10 watts is used for data communication, especially not more than 5 watts, in particular not more than 3 watts. The power can also be required to operate electronics of the attachment, which uses the signal coil as an antenna.

The power coil can advantageously be operated at a frequency of not more than 400 kHz, in particular in the frequency range between 100 kHz and 400 kHz. Alternatively or additionally, data about the signal turn (s) at frequencies are transmitted, which are below the frequency band for the power transmission.

The system has at least one such household appliance and a household operating device, which can be coupled to one another by means of transformers. Only one of the transformer-coupled household appliances may be equipped with a dedicated signal coil; the other of the household appliances may also use the power coil for data transmission. A combined signal / power coil is simpler and more compact in construction, but the signal processing is more complex due to the superimposition of the power signal with the data signal. It is therefore preferred if both devices have a dedicated signal coil.

A system is preferred in which the power coils and / or the signal windings of the household operating device and at least one household add-on device are designed to be the same or substantially the same (i.e. with only minor deviations). Alternatively, for example, the signal turns of the household operating device and the household attachment can be configured differently, e.g. B. with a gear ratio of 10: 1 to 1:10, but preferably with 1: 1.

The coil cores of household operating device and household attachment can be designed differently, for. B. in terms of diameter, shape, height, material, etc. However, it is preferred if the coil cores are of the same or substantially the same design, since it is particularly inexpensive to manufacture on a single production line.

Overall, it is preferred if the transformer halves of the household operating device and household attachment, which are each composed of the coils and - if present - the coil core, are of the same or substantially the same design.

Fig. 1

zeigt ein System aus einem Betriebsgerät zum Betreiben eines Aufsatzgeräts mittels transformatorischer Energieübertragung und einem darauf angeordneten Topf als Aufsatzgerät;

Fig. 2

zeigt eine Skizze einer vereinfachten Regelstruktur des Systems aus Fig. 1;

Fig. 3

zeigt in einer Schnittdarstellung das Betriebsgerät und das Aufsatzgerät mit konstruktiver Ausgestaltung von Transformatorhälften eines trennbaren Transformators;

Fig. 4

zeigt in Aufsicht eine Anordnung von Elementen einer Transformatorhälfte aus Fig. 3.

In the following figures, the invention is schematically described in more detail using exemplary embodiments. For better clarity, elements that are the same or have the same effect can be provided with the same reference numerals, the first digit indicating the reference to the figure in which the element is located.

Fig. 1

shows a system of an operating device for operating an attachment device by means of transformer energy transfer and a pot arranged thereon as an attachment device;

Fig. 2

shows a sketch of a simplified control structure of the system Fig. 1 ;

Fig. 3

shows in a sectional view the operating device and the top unit with a structural design of transformer halves of a separable transformer;

Fig. 4

shows in supervision an arrangement of elements of a transformer half Fig. 3 ,

Fig. 1 shows an attachment device in the form of an intelligent pot 101, which represents an electrical consumer. The pot 101 has a base body 102 with a lid and handles and a secondary coil 114 designed as a drive unit as a power coil. The pot 101 is arranged for operation on a surface of a worktop 105 of an operating device 106. An energy transmission unit 107 is mounted under the worktop 105. This has a housing 108 with an actuating element 109 for switching the energy transmission unit 107 on and off. Furthermore, the energy transmission unit 107 comprises a primary coil 111 as a power coil and a power generation unit 112 for supplying the primary coil 111 with an alternating current. In this exemplary embodiment, the power generation unit 112 is designed as an inverter. The primary coil 111 is wound in the form of a flat spiral winding. During the operation of the energy transmission unit 107 and the pot 101, the primary coil 111 is fed with the alternating current and generates an alternating magnetic field. By means of a field flow of this alternating field, the primary coil 111 transmits energy by induction to the secondary coil 114, which is arranged on a work zone (energy transfer area) 113a drawn on the surface of the work plate 105. No attachment is arranged on an adjacent working zone 113b. The secondary coil 114 is designed as a flat spiral winding. The working zones 113a and 113b are drawn on the worktop 105 by means of a respective line 115a, 115b. A secondary voltage is induced in the secondary coil 114 by the magnetic field flux, which is used as the operating voltage for operating the pot 101. The pot 101 can be from the working zone 113 are removed, whereby the secondary coil 114 is separated from the primary coil 111. Additional attachments can then be brought to the working zone 113, such as, for. B. a coffee maker, a mixer, a charger, a deep fryer, a toaster, a kettle etc. (also referred to as 'small household appliances'), each having one or more secondary coils and from a wireless interaction of the respective secondary coil with the primary coil 111 ( "transformer coupling") refer to operating energy.

A control panel in the form of a touch-sensitive screen 104 is also embedded in the worktop 105, on which display elements and actuating elements are freely programmable. The touch-sensitive screen 104 can be, for example, a liquid crystal or LED screen which is covered by a touch-sensitive film, e.g. B. an ITO film is covered. As a result, a large number of different actuating elements, such as buttons, circular sliders, linear sliders, can essentially be displayed as desired on the control panel, which allows very flexible operator guidance. By means of the control panel 104, in particular the two working zones 113a and 113b can be controlled independently of one another, e.g. B. activated (switched on) and deactivated (switched off) and operating parameters of the attachment 101 arranged there can be set. An operating sequence of a respective attachment 101 can also be started.

The pot 101 is equipped with an integrated circuit 116 for processing data and for outputting data to a transmitter. A temperature sensor 127 for determining a temperature on the pot 116 is connected to an input of the integrated circuit 116. The integrated circuit 116 cyclically senses the temperature sensor 127, processes the sensed temperature signals into a predetermined data and protocol structure and transmits the temperature data processed in this way to a transmitter. The transmitter has a modulator and a downstream transmission signal coil (not shown). A signal winding separate from the secondary coil 114 serves as the transmission signal coil. The data signals emitted by the transmission signal coil are picked up by a reception signal coil of the operating device 106 (not shown), demodulated in a demodulator of the operating device 106 (not shown) and forwarded to a control unit 110 of the operating device 106. Among other things, by means of of the temperature data controls or regulates the control unit (“stove electronics”) 110, which here comprises a microcontroller, the power generation unit 112.

Although only two working zones 113a, 113b are shown on the operating device, fewer or more working zones can also be realized, in particular four or five working zones.

Fig. 2 shows a sketch of a simplified control structure of a system comprising an intelligent pot 201 and an operating device 206.

The intelligent pot 201 has a base body 202, which is closed at the bottom by a pot base 220 and can be filled into the food 221. A heating track 222 in the form of a tortuous resistance thick-film track runs on an underside of the pot bottom 220, which is heated when energized and thus heats the pot bottom 220 to heat the food 221. For its power supply, the heating track 222 is connected to a secondary coil 214 in the form of a spiral-shaped secondary winding and represents its load. From the secondary coil 214, an electrical power for supplying top electronics 223 is also branched off. For this purpose, the top electronics 223 has a switching regulator 224, which converts the AC power output from the secondary coil 214 into a low-voltage DC voltage. The remaining parts of the top electronics 223 are operated by means of the low-voltage DC voltage, of which an analog measuring electronics 225, an integrated circuit 216 and a modulator 226 are shown here. Measuring signals from various sensors of the pot 201 are sensed by means of the analog measuring electronics 225. To simplify the illustration, only three temperature sensors 227 attached to the underside of the pot base 220 are shown. However, other sensors can also be connected to the analog measuring electronics 225, e.g. B. pressure sensors or moisture sensors. Furthermore, an inherent temperature sensor 217 is present directly at a measuring input of the analog measuring electronics 225. This therefore measures the temperature in the area of this measuring input of the analog measuring electronics 225; Since the top electronics 223 are housed comparatively compactly on a common circuit board (not shown), the temperature at this measurement input is also considered to be representative of the temperature at the integrated circuit 216.

The analog measuring electronics 225 is connected on the output side to an input side of the integrated circuit 216, so that temperature data are forwarded from the analog measuring electronics 225 to the integrated circuit 216 for subsequent processing. The integrated circuit 216 has an A / D converter (not shown) for processing the temperature data transmitted analogously by the measuring electronics 225. In the integrated circuit 216, the digital "raw data" supplied by the analog measuring electronics 225 are reformatted into a format compatible for communication with the operating device 206. In particular, raw data are converted into a predetermined data format and protocol format. The formatted measurement data is then cyclically, e.g. B. every 10 ms, forwarded to the modulator 226, where they are modulated onto a carrier signal, in order to then be transmitted from the modulator 226 to the operating device 206 via a signal coil 228. The signal coil 228 is configured here as a signal winding running parallel to the pot base 220. However, other measurement data can also be processed by the integrated circuit 216 and forwarded to the modulator 226, such as a measurement signal of a secondary-side power voltage. Other data can also be processed by the integrated circuit 216 and forwarded to the modulator 226, such as identification data (identity code, etc.) and operating data, cyclically or - in the case of bidirectional communication - on request. The operating device 206 has a received signal coil 229, which is also designed as a signal winding, which is essentially opposite the signal winding of the transmitted signal coil 228 of the pot 201. The received signal coil 229 receives the modulated carrier signal emitted by the transmitted signal coil 228 and forwards it to a demodulator 230, in which the data modulated onto the carrier signal is extracted and output again as readable digital data. Thus, both the data sensed by the analog measuring electronics 225 and the identification data and operating data supplied by the integrated circuit 216 are now present in the operating device 206. This data is further processed in a control unit (“stove electronics”) 210 and evaluated for the operation of the pot 201. Due to the coil-like design and the opposite arrangement of the transmission signal coil 228 and the reception signal coil 229, near-field data transmission is achieved, which does not emit significantly laterally and is therefore not picked up by other receivers in other work zones. This prevents crosstalk and a clear assignment of pot 201 and operating device 206 is achieved only on the basis of the data transmission as such and without other means.

For example, the temperature data emitted by the pot 201 can be in the form of resistance values of the temperature sensors used, if these are designed as resistance temperature sensors. From this, the actual temperature on the underside of the pan base 220 can be determined in the control unit 210 by looking up corresponding resistance / temperature characteristics in a look-up table, and the temperature of the food to be cooked can be derived therefrom. For example, the temperature on the underside of the pan base 220 can be equated with the temperature of the food, or an empirically determined temperature difference can be added, which can also be dependent on the level of the measured temperature. The control unit 210 also receives inputs from a control panel 204, for example via a target food temperature for a temperature control. For this purpose, an operator has previously set the target food temperature directly on the control panel 204 or via a cooking program. Other control variables such as PID coefficients can also be sent from the control panel 204 to the control unit, unnoticed by the operator. In the case of temperature control, a control deviation between the target food temperature and the actual food temperature can be determined in the control unit 210, as can a manipulated variable of the control circuit, from which a control voltage for controlling a power generation unit 212 in the form of power electronics is in turn calculated and output. The control voltage is in a range between 0 V (switched off) and 4 V (maximum). For this purpose, a digital / analog converter 231 is inserted between the control unit 210 and the power generation unit 212. By means of the power generation unit 212, a primary coil 211 is operated in the form of a spiral-shaped power winding, as already with regard to Figure 1 has been carried out. For this purpose, the power generation unit 212 generates an AC power voltage applied to the primary coil 211, here for example between 10 VAC and 230 VAC at a frequency between 100 KHz and 400 KHz. The primary coil 211 generates an alternating magnetic field, which in turn is absorbed by the secondary coil 214. In other words, an energy transfer based on induction (“transformer coupling”) results between the primary coil 211 and the secondary coil 214.

Is the pot 201 placed on the operating device 206, for example on the in Figure 1 The illustrated working zone 113a of the worktop 105 can transmit energy from the operating device 206 to the pot 201 and data signals from the pot 201 to the operating device 206 become. However, due to the transformer or inductive coupling between the primary coil 211 and the secondary coil 214, the energy transmission is only possible in a near field of the primary coil 211 for the operation of the pot 201. Typical maximum vertical distances (along the z-extent) between control gear 206 and pot 201 are between 0.3 mm and 3 mm. A maximum offset in r-extension from a centered position is up to 3 cm. If the pot 201 is further removed from the primary coil 211, the transmitted power is no longer sufficient to operate the pot 201. Then the transmitted energy is no longer sufficient to operate the top electronics 223, which then stops operating. The power required on the pot 201 for data transmission, including for operating the top electronics 223, is less than 5W, advantageously not more than 3W. An interruption in the data transmission is interpreted as removal of the pot 201 from the operating device 206.

When the pot 201 approaches an operating device 206, it can reenter the near field of the primary coil 211 and can thus be supplied with energy again. In this case, the top electronics 223 again sends signals via the transmitters 226, 228 which are recognized by the operating device 206. Data transmission is interpreted as placing the pot 201 on the operating device 206.

Fig. 3 shows a sectional view of the operating device 306, which has the power generation unit 312, the control unit 310 and the primary coil 311, and also shows the intelligent pot 301 with the secondary coil 314 and the heating track 322. For a clearer illustration, the low-voltage range of the intelligent pot 301 with pot electronics , Sensors, etc. not shown as a load. The primary coil 311 is arranged in a circular recess 332 of an iron core (in particular ferrite core) 333 of the operating device 306, which serves to amplify a field strength generated by the primary coil 311. A further iron core (in particular ferrite core) 334 can be seen in the pot 301, which likewise has a circular recess 335 in which the secondary coil 314 is arranged. The iron core 334 with the secondary coil 314 (secondary transformer half) can be separated from the iron core 333 with the primary coil 331 (primary transformer half), as is indicated schematically by an arrow P. The working surface of the worktop 305 is shown schematically by a dashed line. The primary coil 311 is in the form of a spiral coil (see also Fig. 1 ) wrapped in a power winding plane 336. The secondary coil 314 is also in the form of a spiral coil wrapped in a power winding plane 337. The secondary coil 314 and the primary coil 311 have the same number of windings, namely five here.

A single signal winding 338 of a primary-side signal coil 329 is arranged in the primary-side recess 332 of the primary-side iron core 333 with respect to the primary coil 311. This therefore runs around the outside of the flat primary-side power coil 311. The signal winding 338 is fastened to an outer side wall 339 of the recess 332. The power winding level 336 and the signal winding level thus coincide. Analogously, a single signal winding 341 of a secondary-side signal coil 328 is arranged in the recess 335 of the secondary-side iron core 334 on the outside with respect to the secondary-side power coil 314. This therefore runs around the outside of the flat secondary-side power coil 314. The signal winding 341 is also fastened to an outer side wall 342 of the secondary-side recess 335. The power winding level 337 and the signal winding level thus also coincide. The signal windings 338, 341 are both operated at a frequency of 4 MHz or above, while the power coils 311, 314 run at a frequency of no more than 400 KHz. The conductors of the signal windings 338, 341 are wound from HF strands 30 x 0.05, the conductors of the power coils 311, 314 are wound from HF strands 840 x 0.07. The primary-side windings 311 and 338 are potted in the primary-side recess 332 with resin or plastic; likewise, the secondary-side windings 314 and 341 are encapsulated in the secondary-side recess 335 with resin or plastic.

By installing the transformer halves (primary coil 311 and primary-side coil core 333 or secondary coil 311 and secondary-side coil core 334) in a horizontal arrangement, the field direction between them is vertical, which causes only minimal interference emissions (EMC).

Fig. 4 shows in supervision an arrangement of elements of a transformer half Fig. 3 , Only the transformer half for the top unit is described here; the transformer half for the control gear is constructed analogously. In the annular recess 435 of the shell-shaped iron core 434 there are the spiral-shaped secondary-side power coil 414 with here eight windings and a secondary-side signal coil 428 with a single signal winding surrounding them on the outside 441. The secondary-side signal winding 441 is attached to the outer side wall 442 of the secondary-side recess 435 by means of double-sided adhesive tape. The diameter of the signal winding 441 is approximately 9 cm.

Some of the advantages of the described embodiment are that a cost-effective and space-saving arrangement, a minimized interference emission (EMC), a robust construction, no danger to an operator due to the galvanic isolation of the transformer halves and thus also a safe touch, a high degree of design freedom in the device design, a cable-free Power / data transmission, especially for a cable-free kitchen. In addition, no separate power supply (battery, etc.) is required in the attachment.

Of course, the present invention is not limited to the exemplary embodiment shown.

There can also be bidirectional communication between the pot and the operating device. Pot and operating device are then each equipped with a data transmission unit with transmit and receive functions, for. B. a transceiver with a modem and a transmit / receive signal coil. A device that can be operated by the operating device is not restricted to a pot, but can comprise any other electrically operated attachment, such as another cooking utensil (pan, etc.) or a small household appliance.

So the self-temperature sensor can also be positioned at a location other than a measurement input, e.g. B. at another point on the board carrying the top electronics, since the temperatures sensed there can also be representative of a temperature at the top electronics. The self-temperature sensor can also be integrated in a chip, e.g. B. the measuring electronics or a digital circuit. LIST OF REFERENCE NUMBERS 101 Smart pot 228 Transmission signal coil 102 body 229 Received signal coil 104 Control panel 230 demodulator 105 countertop 231 D / A converter 106 control gear 301 Smart pot 107 Power transmission unit 305 countertop 108 casing 306 control gear 109 actuator 310 control unit 110 control unit 311 primary coil 111 primary coil 312 power generation unit 112 power generation unit 314 secondary coil 113 work zone 322 heating track 114 secondary coil 328 Secondary signal coil 115 line 329 Primary signal coil 116 integrated circuit 332 Primary recess 117 Own temperature sensor 333 Primary-sided iron core 201 Smart pot 334 Secondary iron core 202 body 335 Secondary recess 206 control gear 336 the winding plane 210 control unit 337 the winding plane 211 primary coil 338 Sign gyrus 212 power generation unit 339 outer side wall 214 secondary coil 341 Sign gyrus 216 integrated circuit 342 outer side wall 217 Own temperature sensor 414 secondary coil 220 pot base 428 signal coil on the secondary side 221 be cooked 434 iron core 222 heating track 435 recess 223 pot electronics 441 Sign gyrus 224 switching regulators 442 outer side wall 225 analog measuring electronics P arrow 226 modulator V _B secondary voltage 227 temperature sensor V _R Secondary voltage characteristic

Claims (15)

1. Electrically operated household attachment appliance (101; 201; 301), having

   - at least one power coil (114; 214; 314; 414) with in each case at least one power winding for inductively tapping energy from an electromagnetic excitation field, in particular magnetic alternating field, for operating the household attachment appliance (101; 201; 301), at least one signal coil (228; 328; 428) with in each case at least one signal winding (341; 441) and a data transmission unit (226; 228),

   wherein

   - the at least one power coil (114; 214; 314; 414) is connected to the data transmission unit (226, 228) for supplying electricity thereto,

   - the at least one signal winding (341; 441) lies in a signal winding plane (337),

   - the signal coil (228; 328; 428) is a signal coil of the data transmission unit (226, 228) for data transmission between the attachment appliance (101; 201; 301) and an operating appliance (106; 206; 306) and

   - the power winding plane (337) lies essentially parallel to the signal winding plane (337),

   characterised in that

   - the at least one power winding is arranged in a cut-out (332; 335; 435) of a coil core (333, 334; 434) and lies there in a power winding plane (337),

   - the power coil (114; 214; 314; 414) and the at least one signal winding (341; 441) of the signal coil (228; 328; 428) are arranged in the same cut-out (335; 435) of the coil core (334; 434) and

   - the at least one power coil (114; 214; 314; 414) is connected to a resistance-heating conductor (222) for supplying electricity thereto.
2. Household operating appliance (106; 206; 306), having

   - at least one working zone (113a, 113b) for operating an attachment appliance (101; 201; 301), wherein the operating appliance (106; 206; 306) per working zone (113a, 113b) has at least one power coil (111; 211; 311) with in each case at least one power winding for generating an electromagnetic excitation field, in particular magnetic alternating field, on the working zone (113a, 113b) and at least one signal coil (229; 329) per working zone (113a; 113b) with in each case at least one signal winding (338),

   wherein

   - the at least one power winding lies in a power winding plane (336), the at least one signal winding (338) lies in a signal winding plane (336),

   - the power winding plane (336) lies essentially parallel to the signal winding plane (336) and

   - the at least one signal coil (229; 329) is provided for data transmission between the operating appliance (106; 206; 306) and an attachment appliance (101; 201; 301),

   characterised in that

   - the at least one power winding is arranged in a cut-out (332) of a coil core (333) and

   - the power coil (111; 211; 311) and the at least one signal winding (338) of the signal coil (229; 329) are arranged in the same cut-out (332) of the coil core (333).
3. Household appliance (101, 106; 201, 206; 301, 306) according to one of claims 1 or 2, in which the power coil (111, 114; 211, 214; 311, 314; 414) is embodied as a spiral coil.
4. Household appliance (101, 106; 201, 206; 301, 306) according to one of the preceding claims, in which the at least one signal winding (338, 341; 441) of the signal coil (228, 229; 328, 329; 428) circulates the at least one power coil (111, 114; 211, 214; 311, 314; 414) externally.
5. Household appliance (101, 106; 201, 206; 301, 306) according to one of the preceding claims, in which the power winding plane (337) and the signal winding plane (337) match.
6. Household appliance (101, 106; 201, 206; 310, 306) according to one of the preceding claims, in which the signal winding (338, 341; 441) is guided along a side wall (339; 342; 442) of the cut-out (332, 335; 435).
7. Household appliance (101, 106; 210, 206; 301, 306) according to one of the preceding claims, in which the signal winding (338, 341; 441) is operated at a frequency of 4 MHz or above.
8. Household appliance (101, 106; 201, 206; 301, 306) according to one of the preceding claims, in which for data communication no more than 10 watts are consumed, especially no more than 5 watts, in particular no more than 3 watts.
9. Household appliance (101, 106; 201, 206; 301, 306) according to one of the preceding claims, in which the power coil (111, 114; 211, 214; 311, 314; 414) is operated at a frequency of no more than 400 KHz.
10. Household appliance (101, 106; 201, 206; 301, 306) according to one of the preceding claims, in which a diameter of the signal winding (338, 341; 441) amounts to between 8 cm and 10 cm.
11. Household appliance (101, 106; 201, 206; 301, 306) according to one of the preceding claims, in which the signal winding (338; 341; 441) is provided for operation in a range from a frequency of 4 MHz.
12. Household appliance according to one of the preceding claims, in which the power coil (111, 114; 211, 214; 311, 314; 414) is provided for operation in the range with a frequency of no more than 400 KHz.
13. Household appliance (101, 106; 201, 206; 301, 306) according to one of the preceding claims, in which for data communication a power of no more than 10 watts is provided, especially no more than 5 watts, in particular no more than 3 watts.
14. System comprising a household operating appliance (106; 206; 306) according to claim 2 with at least one household attachment appliance (101; 201; 301) according to claim 1, in which a minimal frequency of a power signal transmitted between the power coils (111, 114; 211, 214; 311, 314; 414) or a data signal transmitted between the signal coils (228, 229; 328, 329; 428) is at least ten times higher than a maximum frequency of any other signal.
15. System according to claim 14, in which the power coils (111, 114; 211, 214; 311, 314; 414) and/or the signal coils (228, 229; 328, 329; 428) of the household operating appliance (106; 206; 306) and household attachment appliance (101; 201; 301) are embodied to be the same.

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