Cooking appliance

Abstract

The invention relates to a cooking appliance (26a-e), particularly an induction cooking appliance, having: at least one output unit (30a-e), which is intended, in an operating mode, to provide a heat output for a heating unit; at least one power supply unit (40a-e); a secondary filter (60a-e), which filters at least the power supply unit (40a-e) in an inactive mode; and a main filter (50a-e), which filters at least the output unit (30a-e) in the operating mode. According to the invention, in order to provide an appliance of the type in question with improved characteristics in respect of costs, the main filter (50a-e) additionally filters at least the power supply unit (40a-e) in the operating mode.

Description

[0001] The invention relates to a cooking appliance according to the preamble of claim 1 and a method for operating a cooking appliance according to the preamble of claim 15.

[0002] A cooking appliance device with a main filter and a secondary filter is already known from the prior art, wherein the main filter only filters a power unit and the secondary filter is permanently connected to a power supply unit.

[0003] WO 2014 / 033580 A1 (BSH BOSCH SIEMENS HAUSGERAETE [DE]) March 6, 2014 (2014-03-06) discloses a household appliance device with at least two consumers and at least one switching unit having at least one first multiple switching component.

[0004] The object of the invention is, in particular, to provide a generic device with improved properties in terms of cost. This object is achieved according to the invention by the features of claims 1 and 15, while advantageous embodiments and further developments of the invention can be found in the subclaims.

[0005] The invention is based on a cooking appliance, in particular an induction cooking appliance, having at least one power unit which is intended to provide a heating power for a heating unit in an operating mode, having at least one power supply unit, having a secondary filter which filters at least the power supply unit in an inactive mode, and having a main filter which filters at least the power unit in the operating mode.

[0006] It is proposed that the main filter in the operating mode, in particular in addition to the power unit, filters at least the power supply unit.

[0007] Such a configuration makes it possible to achieve a cost-effective design. In particular, a cooking appliance device that is easy to implement can be provided. Furthermore, the time during which the main filter, in particular an X2 capacitor, is connected to the power supply network can advantageously be reduced. In addition, a circuit that synchronizes the power supply unit and the power unit can advantageously be dispensed with, since a sigma-delta modulation in particular can perform this function. Since insulation of the power supply unit in particular can be dispensed with, low costs in particular can be achieved. Furthermore, a choke in particular can be reduced, since the secondary filter only carries an electrical current in the inactive mode.

[0008] A "cooking appliance device," in particular an "induction cooking appliance device," is understood to mean at least one part, in particular a subassembly, of a cooking appliance, in particular an induction cooking appliance. For example, the cooking appliance could comprise at least one oven, in particular at least one baking oven and / or at least one stove, and could in particular be designed as an oven. The cooking appliance could, for example, be designed as a grill and / or as a microwave. Preferably, the cooking appliance is designed as a hob, and particularly preferably as an induction hob.

[0009] In particular, the power unit performs frequency conversion in the operating mode and, in particular, converts a low-frequency AC voltage on the input side into a high-frequency AC voltage on the output side. A "low-frequency AC voltage" is understood, in particular, to mean an AC voltage with a frequency of no more than 100 Hz. A "high-frequency AC voltage" is understood, in particular, to mean an AC voltage with a frequency of at least 1000 Hz. In particular, the power unit is intended to adjust the electrical power of the heating unit at least by adjusting the high-frequency AC voltage. In particular, the power unit comprises at least one rectifier. In particular, the power unit has at least one heating frequency element, which could, in particular, be designed as an inverter. The power unit has, in particular, at least one inverter.A "heating frequency element" is understood in particular to mean an electrical unit that generates an oscillating electrical current, preferably with a frequency of at least 15 kHz, in particular of at least 17 kHz, and advantageously of at least 20 kHz, for operating the heating units. In particular, the inverter comprises at least two bipolar transistors with insulated gate electrodes and, particularly advantageously, at least one damping capacitor. A "heating unit" is understood in particular to mean a unit that is intended to supply energy to at least one cooking utensil in at least one operating state for the purpose of heating the cooking utensil. For example, the heating unit could be designed as a resistance heating unit and, in particular, be intended to convert energy into heat and supply this heat to the cooking utensil for the purpose of heating the cooking utensil.Alternatively or additionally, the heating unit could be designed in particular as an induction heating unit and in particular be provided to supply energy in the form of an alternating electromagnetic field to the cooking utensil, wherein the energy supplied to the cooking utensil could be converted into heat in the cooking utensil in particular.

[0010] A "power supply unit" is understood, in particular, to be an electrical and / or electronic unit intended to supply at least one further unit with electrical energy, which in particular requires a voltage other than that provided by a power supply network. According to the invention, the power supply unit provides at least one DC voltage at at least one output of the power supply unit in the operating mode and / or in the inactive mode. In particular, the power supply unit has at least two, in particular at least three, and advantageously several outputs, at which, in particular, different electrical voltages, preferably DC voltages, can be tapped.In particular, the power supply unit is provided for supplying energy to at least one control unit and / or at least one driver unit of the power unit and / or a user interface and / or at least one measuring unit, in particular a temperature and / or voltage and / or current measuring unit, and / or at least one cooling fan.

[0011] A "control unit" is understood, in particular, to be an electronic unit that comprises a computing unit and, in particular, in addition to the computing unit, a memory unit with a control program stored therein. In particular, the control unit is intended at least to control and / or regulate at least the power unit using control signals.

[0012] In particular, the cooking appliance is intended for connection to at least two conductors of a power supply network, and advantageously to exactly two conductors of a power supply network. The phrase "the cooking appliance is intended for connection to at least two conductors of a power supply network" is intended to mean, in particular, that the cooking appliance is connected to at least two conductors of a power supply network, and advantageously to exactly two conductors of a power supply network, in at least one operating state. For example, the cooking appliance could be connected to an outer conductor and a neutral conductor and / or to two outer conductors of a power supply network, in at least one operating state.

[0013] An "operating mode" is to be understood in particular as a mode in which the control unit controls and in particular operates the power unit, in particular the inverter of the power unit. According to the invention, the power unit and / or the power supply unit is connected to the power grid in the operating mode. According to the invention, an "inactive mode" is to be understood as a

[0014] This mode is understood to mean a mode in which an electrical supply to the power unit, in particular an electrical connection between the power supply network and the power unit, is interrupted. In particular, in the inactive mode, at least the power supply unit, and advantageously only the power supply unit, is electrically connected to the power supply network. In the inactive mode, in particular, an electrical connection between the power supply network and the power unit is separated and / or interrupted.

[0015] For example, the inactive mode could be a standby mode. In the inactive mode, for example, the control unit could wait for at least one action by an operator and / or for at least one operating input and / or for at least one cooking utensil to be set up. For example, in the inactive mode, the control unit could be provided with at least one action to check and / or monitor an operator's action, particularly at regular intervals.

[0016] In particular, alternatively or additionally, the inactive mode could, for example, be a locked state in which, for example, at least one operator input and / or at least one operator action could be locked and / or blocked. For example, a child lock and / or a timer function could be activated in the inactive mode, due to which, in particular, the operator input and / or the operator action could be locked and / or blocked.

[0017] A "main filter" is understood, in particular, to be a filter that performs at least one filter function, preferably a low-pass filter function for minimizing high-frequency noise, in at least one operating mode. In particular, the main filter has at least one fuse that opens a circuit in the event of a short circuit. In particular, the main filter has at least one X2 capacitor, which is particularly intended to reduce electromagnetic interference (EMC). In particular, the main filter has at least one X2 discharge, which discharges the X2 capacitor in the inactive mode. The main filter, in particular, performs an overvoltage protection function, in particular by means of at least one varistor of the main filter.The main filter comprises, in particular, at least one choke, in particular a current-compensated choke, and / or at least one capacitor and / or at least one varistor, in particular at least the varistor. In particular, the main filter is intended to filter the power unit and / or power supply unit.

[0018] A "secondary filter" is understood, in particular, to be a filter that performs at least one filtering function in at least one inactive mode, in particular for reducing electromagnetic interference. In particular, the secondary filter in the inactive mode has a significantly lower power consumption than the main filter in the operating mode. For example, the secondary filter in the inactive mode could have a power consumption of, in particular, a maximum of 200 mW, advantageously a maximum of 150 mW, particularly advantageously a maximum of 100 mW, and preferably a maximum of 50 mW. The main filter in the operating mode could, in particular, have a power consumption of, in particular, 5 W to 10 W.

[0019] In particular, a maximum current in the inactive mode is in particular a maximum of 200 mA and preferably a maximum of 100 mA. In particular, the secondary filter has at least one, and advantageously exactly one, coil, in particular an SMD coil. In particular, the coil has an inductance of in particular 0.01 mH to 100 mH, advantageously from 0.1 mH to 10 mH, particularly advantageously from 0.5 mH to 5 mH, and preferably of at least substantially 1 mH. "At least substantially" is to be understood in particular as meaning that a deviation from a predetermined value is in particular a maximum of 25%, preferably a maximum of 10%, and particularly preferably a maximum of 5% of the predetermined value.

[0020] "Intended" should be understood in particular to mean specifically programmed and / or designed and / or equipped. The fact that an object is intended for a specific function should be understood in particular to mean that the object fulfills and / or performs this specific function in at least one application and / or operating state.

[0021] It is further proposed that the cooking appliance device comprise a switching unit which, upon switching from inactive mode to operating mode, changes the assignment of the power supply unit from the secondary filter to the main filter. In particular, upon switching from operating mode to inactive mode, the switching unit changes the assignment of the power supply unit from the main filter to the secondary filter. The switching unit is provided, particularly upon switching between inactive mode and operating mode, for a reversible change in the assignment of the power supply unit between the secondary filter and the main filter. An "assignment" of a unit to another unit is to be understood as meaning, in particular, an electrical connection, in particular a direct connection, between the unit and the other unit.A "switching unit" should be understood, in particular, as a unit designed to change a current conducting property when a switching position is changed. The switching unit could, for example, have at least one switching element, which could, for example, have at least one relay and / or at least one transistor and, in particular, be designed as such. In particular, the switching unit could, in a first switching position of the switching element, interrupt a first conducting path and, in particular, prevent a current flow via the first conducting path. In a second switching position of the switching element, the switching unit could, for example, interrupt a second conducting path, which could, in particular, be different from the first conducting path, and, in particular, prevent a current flow via the second conducting path.In particular, the switching unit could have at least one diode and, in particular by means of the diode and / or the switching element, influence at least one current flow characteristic of at least one conduction path, such as blocking it in at least one direction and / or allowing it to pass unhindered in at least one direction. A "conduction path" is to be understood in particular as an electrically conductive connection between two points. An "electrically conductive" object and / or an "electrically conductive" connection is to be understood in particular as an object and / or a connection with a specific electrical resistance of at most 10 -4 < Ωm, in particular of at most 10 -5 < Ωm, advantageously of at most 10 -6 < Ωm, and particularly advantageously of at most 10 -7 < Ωm at a temperature of 20°C.In particular, the switching unit at least partially and advantageously completely bypasses the main filter in the inactive mode. This advantageously allows for easy switching between the operating mode and the inactive mode, in particular between the main filter and the secondary filter.

[0022] It is further proposed that the switching unit comprise at least one switching element that selectively connects the main filter to a power supply network in the operating mode and disconnects it from the power supply network in the inactive mode. In particular, the switching element selectively connects the main filter to a power supply network in the operating mode and disconnects the main filter from the power supply network in the inactive mode. The phrase "at least partially connects" a filter to a power supply network in one mode is intended to mean, in particular, that the switching element selectively connects at least part of the filter to the power supply network in that mode. For example, the switching element could be a bidirectional unipolar switch.The switching element could, for example, enable a current flow, in particular through the switching element, along the conduction path in both directions and, in particular, short-circuit an electrical voltage in at least one polarity direction. In particular, the switching element is directly connected to a conductor of the power supply network. In particular, the switching element changes an electrical connection based on at least one control signal from the control unit. This can advantageously optimize the service life of the main filter, since the main filter is not permanently connected to the power supply network.

[0023] It is further proposed that the switching element selectively connects the main filter in the operating mode and the secondary filter in the inactive mode to the power supply network, at least partially. In particular, the switching element selectively connects the main filter in the operating mode and the secondary filter in the inactive mode to the power supply network. For example, the switching element connects at least part of the main filter in the operating mode, in particular permanently, to the power supply network. For example, the switching element connects at least part of the secondary filter in the inactive mode, in particular permanently, to the power supply network. When switching between the inactive mode and the operating mode, the switching element could, in particular only, for example, connect at least part of the main filter and / or the secondary filter to the power supply network.This advantageously allows the cost of the cooking appliance to be further optimized, since the secondary filter is particularly adapted to an inactive mode and thus a significantly lower current flows at least through the power supply unit in the inactive mode.

[0024] It is further proposed that the switching unit switches a current flow through the main filter and the secondary filter when switching between the operating mode and the inactive mode. In particular, the switching unit switches an electrical connection between the main filter and the power supply network and an electrical connection between the secondary filter and the power supply network, which in particular results in a current flow through the entire main filter or the entire secondary filter. In particular, the switching unit switches between the operating mode and the inactive mode in particular in a region of a zero crossing of a voltage, in particular provided by the power supply network, in particular in order to reduce voltage peaks in the switching element, in particular in the relay of the switching element. This makes it possible, in particular, to further simplify a switching arrangement of the cooking appliance device.

[0025] It is also proposed that the switching unit connect the secondary filter to the power supply unit in the inactive mode. In particular, in the inactive mode, the power supply unit is connected to the power grid via the secondary filter. In particular, the secondary filter has a high resistance, in particular a high inductive resistance, especially compared to the main filter. In particular, a current at the secondary filter in the inactive mode is significantly lower than a current at the main filter in the operating mode. In this context, "significantly lower" should be understood to mean in particular at least 10 times, preferably at least 100 times, and particularly preferably at least 500 times. As a result, a current, in particular at the power supply unit, can be significantly reduced in the inactive mode.This can reduce costs in particular, since there is no need to insulate the power supply unit.

[0026] It is further proposed that the switching unit at least partially bypass the secondary filter in the operating mode. In particular, the switching unit bypasses the secondary filter in the operating mode. The phrase "at least partially bypasses" the secondary filter in the operating mode is to be understood in particular to mean that the switching unit interrupts a conduction path between the power supply unit and the secondary filter in the operating mode. The phrase "at least partially" bypasses the secondary filter in the operating mode is to be understood in particular to mean that the switching unit bypasses at least part of the secondary filter in the operating mode. In particular, a current and / or power at the secondary filter is at least approximately zero. This can advantageously reduce interference currents in the operating mode.

[0027] It is further proposed that the switching unit comprise at least one flow control valve, which electrically connects the main filter to the power supply unit in the operating mode. In particular, the flow control valve is designed separately from the switching element. A "flow control valve" is to be understood, in particular, as a valve that influences a current flow direction. The current flow control valve could, for example, comprise a diode and / or a relay and / or a transistor. In particular, the flow control valve is arranged between the main filter and / or the secondary filter and the power supply unit and / or the power unit. In particular, the flow control valve is provided to electrically connect the main filter to the power unit and the power supply unit in the operating mode and, in particular, to connect the secondary filter to the power supply unit in the inactive mode.This makes it possible, in particular, to provide filtering of the power supply unit in the inactive mode and filtering of the power supply unit and the power unit in the operating mode.

[0028] It is also proposed that the flow control valve have at least one main filter diode, via which a current flows from the main filter to the power supply unit in the operating mode. In particular, the main filter diode is provided to block a current flow to the power unit in the inactive mode. In particular, the flow control valve has a further main filter diode, via which the current flows from the main filter to the power supply unit during a phase change. This allows, in particular, a switching arrangement of the cooking appliance to be further simplified.

[0029] It is further proposed that the flow control valve have at least one secondary filter diode, via which a current flows from the secondary filter to the power supply unit in the inactive mode. In particular, the secondary filter diode is provided to block the current flow from the main filter to the secondary filter in the operating mode. This advantageously allows a switching arrangement of the cooking appliance to be further optimized.

[0030] Alternatively or additionally, it is proposed that the flow control valve has at least one changeover switch, by means of which the power supply unit can be electrically connected selectively to the main filter and / or the secondary filter. The changeover switch is designed in particular as a changeover switch and / or as a changeover contact. In particular, the changeover switch has at least two, advantageously at least three and preferably at least four switching positions. The changeover switch opens at least a first conduction path and closes, in particular simultaneously, at least a second conduction path when a switching position of the changeover switch changes from a first switching position of the changeover switch to a second switching position of the changeover switch. The changeover switch could, for example, have at least one relay and / or at least one transistor and / or at least one MOSFET and / or at least one IGBT and / or be designed as such.This can particularly increase flexibility in the arrangement of the filters.

[0031] It is also proposed that the main filter and / or the secondary filter be / are arranged at least partially downstream of the switching unit. In particular, the main filter and / or the secondary filter are arranged at least partially downstream of the switching element. Preferably, the main filter and / or the secondary filter are firmly connected to the switching unit, in particular to the switching element and / or the flow control valve. This allows, in particular, the service life of the cooking appliance to be further optimized, since, in particular, the main filter and / or the secondary filter are only connected to the power supply network in the operating mode and / or in the inactive mode.

[0032] It is further proposed that the main filter and the power unit be permanently electrically connected. The phrase "permanently electrically connected" between a first object and a second object should be understood to mean, in particular, that the first object and the second object are connected to one another by means of a direct electrical connection, in particular by means of a single conduction path, in particular independently of the switching positions of a switching unit and / or avoiding a switching unit connected between the first object and the second object. In particular, when the main filter is electrically supplied, the power unit is also electrically supplied. This can, in particular, increase safety, since the power unit, in particular, is always filtered via the main filter.

[0033] It is also proposed that the cooking appliance device has at least one pre-filter which is connected upstream of the main filter and the secondary filter. In particular, the pre-filter is electrically permanently connected to the power supply network. In particular, the pre-filter at least partially forms the main filter and / or the secondary filter. In the operating mode and / or the inactive mode, the pre-filter particularly assumes a filtering function for the main filter and / or for the secondary filter, in particular of the power unit and / or the power supply unit. In particular, the pre-filter has at least one filter element which is intended to assume at least one filtering function in the operating mode and / or in the inactive mode, for example a fuse and / or overvoltage protection.This can further reduce costs, since important filter functions, which are particularly necessary in the operating mode and / or in the inactive mode, can be carried out in the pre-filter.

[0034] It is further proposed that the switching element, particularly in the operating mode, be arranged between the pre-filter and the main filter. In particular, the switching element, particularly in the inactive mode, is arranged between the pre-filter and the secondary filter. The switching element is preferably provided to selectively connect, particularly at least partially, the main filter in the operating mode and the secondary filter in the inactive mode to the pre-filter. This can further reduce costs.

[0035] It is further proposed that the secondary filter and a power supply network be permanently electrically connected. In particular, the switching element is provided, in particular solely, to electrically connect the main filter to the power supply network. In particular, the changeover switch disconnects an electrical connection between the secondary filter and the power supply unit in the operating mode. In particular, the changeover switch is provided to selectively connect the main filter in the operating mode and the secondary filter in the inactive mode to the power supply network, in particular at least partially. This makes it possible, in particular, to reduce the circuit complexity of the switching element.

[0036] Furthermore, a cooking appliance, in particular an induction cooking appliance, with a cooking appliance device according to the invention is proposed. In particular, the cooking appliance has at least the heating unit. Preferably, the cooking appliance has at least one heating zone, which is provided for the placement of at least one item of cooking utensil. In particular, the cooking appliance has at least one user interface for inputting and / or outputting at least one operating parameter, for example at least one control parameter for controlling the heating unit. This makes it possible, in particular, to provide a cooking appliance with lower cost. Furthermore, the service life of the cooking appliance can be improved, in particular.

[0037] Furthermore, the invention is based on a method for operating a cooking appliance according to the invention, in particular an induction cooking appliance, having at least one power unit that provides heating power for a heating unit in an operating mode, and having at least one power supply unit that is filtered by a secondary filter in an inactive mode, wherein in the operating mode, at least the power unit is filtered by a main filter. It is proposed that in the operating mode, at least the power supply unit be filtered by the main filter.

[0038] Such a method advantageously provides a cost-effective circuit device that is particularly advantageously simple to implement. Furthermore, the time during which the main filter, in particular the X2 capacitor, is connected to the power supply network can be reduced. Furthermore, a circuit that synchronizes the power supply unit and the power unit can be omitted, since sigma-delta modulation performs this function. Furthermore, costs can be further reduced, since insulation of the power supply unit can be omitted. Furthermore, the choke can be reduced, since the secondary filter only carries an electrical current in the inactive mode.

[0039] The cooking appliance device is not intended to be limited to the application and embodiment described above. In particular, the cooking appliance device may have a number of individual elements, components, and units that differs from the number stated herein to fulfill a functionality described herein.

[0040] Further advantages will become apparent from the following description of the drawings. The drawings illustrate exemplary embodiments of the invention. The drawings, the description, and the claims contain numerous features in combination. Those skilled in the art will also expediently consider the features individually and combine them into useful further combinations.

[0041] They show: Fig. 1 shows a cooking appliance designed as an induction hob with a cooking appliance device in a schematic plan view, Fig. 2 shows the cooking appliance device with a switching unit in an operating mode in a schematic representation, Fig. 3 shows the cooking appliance device with the switching unit in an inactive mode in a schematic representation, Fig. 4 shows an alternative cooking appliance device with a switching unit and a pre-filter in an inactive mode in a schematic representation, Fig. 5 shows a further alternative cooking appliance device with a switching unit in an inactive mode in a schematic representation, Fig. 6 shows the cooking appliance device from Fig. 5 in an operating mode in a schematic representation, Fig. 7 a further alternative cooking appliance device with a switching unit in an operating mode in a schematic representation, Fig. 8 the cooking appliance device from Fig.7in an inactive mode in a schematic representation, Fig. 9 a further alternative cooking appliance device with a switching unit in an operating mode in a schematic representation and Fig. 10 the cooking appliance device from Fig.9 in an inactive mode in a schematic representation.

[0042] Figure 1shows a cooking appliance 10a configured as an induction hob 12a. The induction hob 12a comprises a hob plate 14a, in particular made of glass ceramic, on which heating zones 24a are marked in a known manner. When the induction hob 12a is in an operational state, the hob plate 14a is arranged horizontally and is provided for placing cooking utensils. Furthermore, touch-sensitive operating elements 20a and display elements 18a of a user interface 16a of the induction hob 12a are marked in a known manner on the hob plate 14a. The induction hob 12a has four independent heating units 22a configured as inductor coils. Only one of the heating zones and one of the heating units is described below.

[0043] The heating units 22a can be controlled and / or regulated using the user interface 16a. The heating unit 22a is arranged below the heating zone 24a. The induction hob 12a further comprises a cooking device 26a for controlling and / or regulating the heating units 22a. The cooking device 26a is designed as an induction cooking device.

[0044] Figure 2 shows the cooking appliance 26a in an operating mode in a simplified representation. The cooking appliance 26a is connected to at least one power supply network 100a. The cooking appliance 26a is connected to two conductors of the power supply network 100a. The cooking appliance 26a is connected to at least one phase conductor and to one neutral conductor of the power supply network 100a. In the Figure 2 , as well as in the other figures only the outer conductor is shown.

[0045] The cooking appliance 26a has at least one power unit 30a. The power unit 30a is intended to provide heating power for the heating unit 22a in the operating mode. The power unit 30a performs frequency conversion in the operating mode. The power unit 30a converts a low-frequency AC voltage on the input side into a high-frequency AC voltage on the output side. The power unit 30a has a rectifier. The rectifier is designed as a full-bridge diode. The power unit 30a has at least one inverter for frequency conversion. In the operating mode, the power unit 30a is electrically connected to the power supply network 100a. The cooking appliance 26a has at least one power supply unit 40a. In the operating mode, the power supply unit 40a is connected to the power supply network 100a. The cooking appliance 26a has at least one control unit 70a.The power supply unit 40a is provided to supply power to the control unit 70a. The control unit 70a is provided at least to control and / or regulate the power unit 30a using control signals.

[0046] The cooking appliance 26a has a main filter 50a. In the operating mode, the main filter 50a filters at least the power unit 30a. In the operating mode, the main filter 50a filters at least the power unit 30a. In the operating mode, the main filter 50a filters the power supply unit 40a in addition to the power unit 30a. In the operating mode, the main filter 50a is electrically connected to the power supply network 100a. In the operating mode, the main filter 50a is electrically connected to the power unit 30a. The main filter 50a and the power unit 30a are permanently electrically connected. In the operating mode, the main filter 50a is electrically connected to the power supply unit 40a. The main filter 50a has at least one fuse. The fuse is designed to open a line in the event of a short circuit. The main filter 50a has at least one X2 capacitor. The main filter 50a has at least one overvoltage protection.The main filter 50a has at least one common-mode choke. The main filter 50a has at least one differential-mode choke. The cooking appliance 26a has a secondary filter 60a. In an inactive mode, the secondary filter 60a filters at least the power supply unit 40a. In the inactive mode, the secondary filter 60a is separated from the power supply network 100a. In the inactive mode, the secondary filter 60a is electrically separated from the power unit 30a. In the operating mode, the secondary filter 60a is electrically separated from the power supply unit 40a. The secondary filter 60a is merely a coil. The coil has an inductance of 1 mH.

[0047] The cooking appliance 26a has at least one switching unit 80a. When changing from the inactive mode to the operating mode, the switching unit 80a changes the assignment of the power supply unit 40a from the secondary filter 60a to the main filter 50a. The switching unit 80a is designed as a relay. In the operating mode, the switching unit 80a at least partially bridges the secondary filter 60a. In the operating mode, the switching unit 80a connects the power supply network 100a to the main filter 50a. In the operating mode, the switching unit 80a connects the power supply network 100a to the power unit 30a. In the operating mode, the switching unit 80a connects the power supply network 100a to the power supply unit 40a. In the operating mode, the switching unit 80a connects the main filter 50a to the power supply unit 40a. The switching unit 80a has at least one switching element 82a.The switching element 82a selectively connects the main filter 50a to the power supply network 100a in the operating mode. The switching element 82a selectively connects the main filter 50a to the power supply network 100a in the operating mode and the sub-filter 60a to the power supply network 100a in the inactive mode. The switching element 82a connects the power supply network 100a to the main filter 50a in the operating state. The switching element 82a connects the power supply network 100a to the power unit 30a in the operating state. The relay of the switching element 82a is connected to the sub-filter 60a in the open position.

[0048] The switching unit 80a has at least one flow control valve 84a. The flow control valve 84a is arranged between the main filter 50a and the power supply unit 40a. In the operating mode, the flow control valve 84a electrically connects the main filter 50a to the power supply unit 40a. The flow control valve 84a has at least one main filter diode 88a. In the operating mode, a current flows from the main filter 50a to the power supply unit 40a via the main filter diode 88a. The flow control valve 84a has at least one further main filter diode 88a. The further main filter diode 88a is arranged between a connection point 104a and the main filter 50a. The further main filter diode 88a is arranged on the neutral conductor. During a phase change, the current flows through the further main filter diode 88a. Alternatively, the cooking appliance device 26a has at least one capacitor, which is provided to smooth a current curve during a phase change.The flow control valve 84a includes at least one secondary filter diode 86a. In the operating mode, the secondary filter diode 86a blocks current flow from the main filter 50a to the secondary filter 60a. The connection point 104a permanently connects the secondary filter diode 86a to the main filter diode 88a.

[0049] Figure 3shows the cooking appliance 26a in an inactive mode in a simplified representation. In the inactive mode, the power supply unit 40a is electrically connected to the power supply network 100a. In the inactive mode, the secondary filter 60a is electrically connected to the power supply unit 40a. The switching unit 80a connects the power supply network 100a to the secondary filter 60a in the inactive mode. The switching unit 80a connects the power supply network 100a to the power supply unit 40a in the inactive mode. The switching unit 80a connects the secondary filter 60a to the power supply unit 40a in the inactive mode. The switching unit 80a bridges the main filter 50a in the inactive mode. The switching element 82 connects the power supply network 100a to the secondary filter 60a in the inactive mode. The switching element 82a disconnects the main filter 50a from the power supply network 100a in the inactive mode.In the inactive mode, a current flows from the sub-filter 60a to the power supply unit 40a via the sub-filter diode 86a. In the inactive mode, the main filter diode 88a is designed to block a current flow between the sub-filter 60a and the power unit 30a. In the inactive mode, the current can only flow through the cooking appliance device 26a via the outer conductor, since the sub-filter diode 86a blocks the current if it enters through the neutral conductor. In the inactive mode, the relay of the switching element 82a is disconnected from the power supply network 100a. An operator presses an ON / OFF button to bring the cooking appliance 10a out of the inactive mode. The control unit 70a sends a control signal to the power supply unit 40a. The power supply unit 40a supplies the control unit 70a with energy. The control unit 70a sends a control signal to the switching unit 80a.The switching unit 80a changes a switching position, whereby the power supply network 100a is connected to the main filter 50a.

[0050] A method for operating the cooking appliance 26a is proposed. The method is provided for operating the induction cooking appliance. In the operating mode, the main filter 50a is connected to the power supply network 100a. In the operating mode, the main filter 50a is electrically connected to the power supply unit 40a. In the operating mode, the power unit 30a is connected to the power supply network 100a via the main filter 50a. In the operating mode, the main filter 50a is connected to the power supply network 100a via the switching unit 80a. In the operating mode, the power unit 30a and the power supply unit 40a are connected to the power supply network 100a via the switching unit 80a. In the operating mode, the secondary filter 60a is electrically bypassed. In the operating mode, the secondary filter 60a is disconnected from the power supply network 100a. In the inactive mode, the sub-filter 60a is connected to the power supply network 100a.In the inactive mode, the sub-filter 60a is electrically connected to the power supply unit 40a. In the inactive mode, the power supply unit 40a is filtered via the sub-filter 60a. In the inactive mode, the sub-filter 60a is connected to the power supply network 100a via the switching unit 80a. In the inactive mode, the power supply unit 40a is connected to the power supply network 100a via the switching unit 80a. In the inactive mode, the main filter 50a is electrically bypassed. In the inactive mode, the main filter 50a is disconnected from the power supply network 100a.

[0051] In Figures 4 to 8 Three further embodiments of the invention are shown. The following descriptions are essentially limited to the differences between the embodiments, whereby with regard to the same components, features and functions, reference is made to the description of the embodiment of the Figures 1 to 3To distinguish the embodiments, the letter a in the reference numerals of the embodiment in the Figures 1 to 3 by the letters b, c and d in the reference numerals of the embodiments of the Figures 4 to 8 With regard to components with the same designation, in particular with regard to components with the same reference numerals, reference can generally also be made to the drawings and / or the description of the embodiment of the Figures 1 to 3 be referred to.

[0052] Figure 4shows an alternative cooking appliance 26b in an inactive mode in a simplified representation. The cooking appliance 26b has a pre-filter 62b. The pre-filter 62b is connected upstream of a main filter 50b and a secondary filter 60b. The cooking appliance 26b has at least one switching unit 80b. The switching unit 80b has at least one switching element 82b. The switching element 82b is arranged between the pre-filter 62b and the main filter 50b. The pre-filter 62b is permanently connected to the power supply network 100b. The pre-filter 62b at least partially forms the main filter 50b and / or the secondary filter 60b. The pre-filter 62b assumes a filtering function for the main filter 50b and / or the secondary filter 60b in an operating mode and / or an inactive mode. The pre-filter 62b assumes a filter function for a power unit 30b and / or a power supply unit 40b in the operating mode and / or inactive mode.The pre-filter 62b has at least one filter element, which is designed to perform a filtering function in the operating mode and the inactive mode. The pre-filter 62b has a fuse 64b. The pre-filter 62b has an overvoltage protection device 66b. The switching element 82b is designed to selectively at least partially connect the main filter 50b to the pre-filter 62b in the operating mode and the secondary filter 60b to the pre-filter 62b in the inactive mode. In the inactive mode, a current flows from the power supply unit 40b through the fuse 64b, through the overvoltage protection 66b, through the switching element 82b, through the sub-filter 60b, through the sub-filter diode 86b, through the power supply unit 40b, through a full-bridge diode of the power unit 30b, through the differential mode choke 54b and the common mode choke 52b of the main filter 50b, through the switching unit 80b and again through the neutral conductor into the power supply network 100b.

[0053] Figure 5shows a further alternative cooking appliance device 26c in an inactive mode in a simplified representation. The cooking appliance device 26c has at least one switching unit 80c. The switching unit 80c has at least one flow control valve 84c. The flow control valve 84c has at least one changeover switch 90c. By means of the changeover switch 90c, a power supply unit 40c is electrically connected optionally to a main filter 50c and / or a secondary filter 60c. In an inactive mode, the changeover switch 90c connects the secondary filter 60c to the power supply unit 40c. In the inactive mode, the power supply unit 40c is connected to the secondary filter 60c via the changeover switch 90c. In the inactive mode, the power supply unit 40c is connected to the sub-filter 60c and a power supply network 100c via the changeover switch 90c and a switching element 82c of the switching unit 80c.

[0054] Figure 6 shows the cooking appliance device 26c from Fig. 5in an operating mode in a simplified representation. In an operating mode, the switch 90c connects the main filter 50c to the power supply unit 40c and a power unit 30c. In the operating state, the power unit 30c and the power supply unit 40c are connected to the main filter 50c via the switch 90c. In the operating mode, the power supply unit 40c and the power unit 30c are connected to the main filter 50c and the power supply network 100c via the switch 90c and the switching element 82c of the switching unit 80c.

[0055] Figure 7shows a further alternative cooking appliance 26d in an operating mode in a simplified representation. The cooking appliance 26d has a main filter 50d. The cooking appliance 26d has a secondary filter 60d. The secondary filter 60d and a power supply network 100d are electrically connected. The cooking appliance 26d has a switching unit 80d. The switching unit 80d has a flow control valve 84d. The flow control valve 84d has a changeover switch 90d. In the operating mode, the changeover switch 90d disconnects an electrical connection between the secondary filter 60d and the power supply unit 40d. The switching element 82d is merely provided to electrically connect the main filter 50d to the power supply network 100d. The switch 90d is provided to selectively connect the main filter 50d in the operating mode and the sub-filter 60d in the inactive mode to the power supply network 100d, at least partially.In the operating mode, the switch 90d bridges the secondary filter 60d.

[0056] Figure 8 shows the cooking appliance device 26d from Fig.7 in an inactive mode in a simplified representation. In the inactive mode, the switch 90d connects the power unit 30d to the power supply network 100d. In the inactive mode, the switch 90d bypasses the main filter 50d.

[0057] Figure 9 shows another alternative cooking appliance device 26e in an operating mode in a simplified representation. Figure 10 shows the cooking appliance device 26e from Fig.7 in an inactive mode in a simplified representation. The Figures 9 and 10 The embodiment shown differs from the one shown in the Figures 7 and 8 illustrated embodiment by a design of a flow control valve 84e. In the Figures 9 and 10In the illustrated embodiment, the cooking appliance device 26e has a switching unit 80e which has the flow valve 84e.

[0058] The flow control valve 84e has a diode circuit. The flow control valve 84e has at least one main filter diode 88e. In the operating mode, a current flows from a main filter 50e to a power supply unit 40e via the main filter diode 88e. The flow control valve 84e has at least one secondary filter diode 86e. The secondary filter diode 86e is electrically connected between a secondary filter 60e and the power supply unit 40e.

[0059] The switching unit 80e has a switching element 82e. The switching element 82e selectively connects the main filter 50e to a power supply network 100e in the operating mode, at least partially. In the inactive mode, the switching element 82e selectively disconnects the main filter 50e from the power supply network 100e. The secondary filter 60e and the power supply network 100e are electrically connected. Reference symbol

[0060] 10 Cooking appliance 12 Induction hob 14 Hob plate 16 User interface 18 Display elements 20 Control elements 22 Heating unit 24 Heating zone 26 Cooking appliance device 30 Power unit 40 Power supply unit 50 Main filter 52 Common mode choke 54 Differential mode choke 60 Secondary filter 62 Pre-filter 64 Fuse 66 Overvoltage protection 70 Control unit 80 Switching unit 82 Switching element 84 Flow valve 86 Secondary filter diode 88 Main filter diode 90 Changeover switch 100 Power supply network 104 Connection point

Claims

1. Cooking appliance apparatus, in particular induction cooking appliance apparatus, having at least one power unit (30a-e), which is provided, in an operating mode, to supply a heating power for a heating unit (22a-e), having at least one power supply unit (40a-e), which, in the operating mode and / or in an inactive mode, supplies a direct voltage to at least one output, wherein in the operating mode the power unit (30a-e) and the power supply unit (40a-e) are connected to a power supply network (100a-e), having an auxiliary filter (60a-e), which, in the inactive mode, in which an electrical connection between the power supply network (100a-e) and the power unit (30a-e) is separated, filters at least the power supply unit (40a-e), and having a main filter (50a-e), which, in the operating mode, filters at least the power unit (30a-e), characterised in that in the operating mode the main filter (50a-e) filters at least the power supply unit (40a-e).

2. Cooking appliance apparatus according to claim 1, characterised by a switching unit (80a-e), which, upon a changeover from inactive mode into the operating mode, changes an assignment of the power supply unit (40a-e) from the auxiliary filter (60a-e) to the main filter (50a-e).

3. Cooking appliance apparatus according to claim 2, characterised in that the switching unit (80a-e) has at least one switching element (82a-e), which optionally at least partially connects the main filter (50a-e) in the operating mode to a power supply network (100a-e) and in the inactive mode separates the same from the power supply network (100a-e).

4. Cooking appliance apparatus according to claim 3, characterised in that the switching element (82a-c) optionally at least partially connects the main filter (50a-c) in the operating mode and the auxiliary filter (60a-c) in the inactive mode to the power supply network (100a-c).

5. Cooking appliance apparatus according to one of claims 2 to 4, characterised in that in the operating mode the switching unit (80a-e) bridges the auxiliary filter (60a-e).

6. Cooking appliance apparatus according to one of claims 2 to 5, characterised in that the switching unit (80a-e) has at least one flow-control valve (84a-e), which, in the operating mode, electrically connects the main filter (50a-e) to the power supply unit (40a-e).

7. Cooking appliance apparatus according to claim 6, characterised in that the flow-control valve (84a-b; 84e) has at least one main filter diode (88a-b; 88e), by way of which in the operating mode a current flows from the main filter (50a-b; 50e) to the power supply unit (40a-b; 40e).

8. Cooking appliance apparatus according to claim 6 or 7, characterised in that the flow-control valve (84a-b; 84e) has at least one auxiliary filter diode (86a-b; 86e), by way of which in the inactive mode a current flows from the auxiliary filter (60a-b; 60e) to the power supply unit (40a-b; 40e).

9. Cooking appliance apparatus according to claim 6, characterised in that the flow-control valve (84c-d) has at least one toggle (90c-d), by means of which the power supply unit (40c-d) can optionally be electrically connected to the main filter (50c-d) and / or the auxiliary filter (60c-d).

10. Cooking appliance apparatus according to one of the preceding claims, characterised in that the main filter (50a-e) and the power unit (30a-e) are permanently electrically connected.

11. Cooking appliance apparatus according to one of the preceding claims, characterised by a prefilter (62b) which is arranged upstream of the main filter (50b) and the auxiliary filter (60b).

12. Cooking appliance apparatus at least according to claims 3 and 11, characterised in that the switching element (82b) is arranged between the prefilter (62b) and the main filter (50b).

13. Cooking appliance apparatus according to one of the preceding claims, characterised in that the auxiliary filter (60d-e) and a power supply network (100d-e) are permanently electrically connected.

14. Cooking appliance, in particular induction cooking appliance, having a cooking appliance apparatus (26a-e) according to one of the preceding claims.

15. Method for operating a cooking appliance apparatus (26a-e), in particular an induction cooking appliance apparatus, in particular according to one of claims 1 to 13, having at least one power unit (30a-e) which, in an operating mode, supplies a heating power for a heating unit (22a-e), having at least one power supply unit (40a-e), which in the operating mode and / or in an inactive mode supplies a direct voltage to at least one output, wherein in the operating mode the power unit (30a-e) and the power supply unit (40a-e) are connected to a power supply network (100a-e), which, in the inactive mode in which an electrical connection between the power supply network (100a-e) and the power unit (30a-e) is separated, is filtered by way of an auxiliary filter (60a-e), wherein in the operating mode at least the power unit (30a-e) is filtered by way of a main filter (50a-e), characterised in that in the operating mode at least the power supply unit (40a-e) is filtered by way of the main filter (50a-e).

Images