EP3123816B1 - Cooking appliance device having a self-controlling bypassing unit - Google Patents

Cooking appliance device having a self-controlling bypassing unit Download PDF

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Publication number
EP3123816B1
EP3123816B1 EP15715445.1A EP15715445A EP3123816B1 EP 3123816 B1 EP3123816 B1 EP 3123816B1 EP 15715445 A EP15715445 A EP 15715445A EP 3123816 B1 EP3123816 B1 EP 3123816B1
Authority
EP
European Patent Office
Prior art keywords
unit
cooking appliance
bridging
switch
control
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP15715445.1A
Other languages
German (de)
French (fr)
Other versions
EP3123816A1 (en
Inventor
Nicolas Blasco Rueda
Alvaro Cortes Blanco
Oscar GARCIA-IZQUIERDOGANGO
Pablo Jesus Hernandez Blasco
Diego Puyal Puente
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BSH Hausgeraete GmbH
Original Assignee
BSH Hausgeraete GmbH
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Publication date
Application filed by BSH Hausgeraete GmbH filed Critical BSH Hausgeraete GmbH
Publication of EP3123816A1 publication Critical patent/EP3123816A1/en
Application granted granted Critical
Publication of EP3123816B1 publication Critical patent/EP3123816B1/en
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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/12—Cooking devices
    • H05B6/1209—Cooking devices induction cooking plates or the like and devices to be used in combination with them
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0227—Applications
    • H05B1/0252—Domestic applications
    • H05B1/0258—For cooking
    • H05B1/0261—For cooking of food
    • H05B1/0266—Cooktops
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/06—Control, e.g. of temperature, of power
    • H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like

Definitions

  • the invention is based on a cooking device device according to the preamble of claim 1.
  • Cooking hobs are known from the prior art, which comprise a relay and a driver circuit which is provided for driving the relay, wherein the driver circuit comprises a surge protection circuit comprising a freewheeling diode and a zener diode, and a switch bridging the zener diode. Furthermore, a control unit is provided to control the switch in at least one operating state directly by a control signal in order to bridge the Zener diode.
  • a hob is known with at least one inductor, at least one inverter, a switching device and a detection circuit for detecting cookware, wherein the switching device is arranged in a circuit between the inductor and the inverter, so that the switching device in a first switching position a connection between the inverter and the inductor and breaks the connection between the inverter and the inductor in at least a second switching position.
  • the switching device is connected to the detection circuit in such a way that the switching device in the at least one second switching position connects the inductor to the detection circuit.
  • the international patent application WO 2012/063159 A1 discloses a heating device, in particular a cooktop heating device, with at least one heating connection for at least one heating element and at least one frequency unit.
  • the heater includes a protection unit configured to detect existence of a conduction path between the frequency unit and the heater terminal.
  • a Kochmuldenvorraum in particular a Indu Vietnameseskochmuldenvorraum, with at least one switching unit, by means of which at least one power supply line can be interrupted and produced, through which at least one operating operation generates a current generated by means of a power supply voltage and which leads to a first switching element, and with at least one control device which controls the switching unit in such a way in the operating process, in that the switching unit interrupts the power supply line during at least a first entire time interval, and which causes the power supply to be established immediately before and immediately after the first time interval, and which causes a switching of the first switching element that starts during the first time interval and ends.
  • the first time interval is less than half the period of the mains voltage.
  • the object of the invention is in particular to provide a generic Garellavorraum with improved properties in terms of efficiency and / or a control.
  • the object is solved by the characterizing features of claim 1, while advantageous embodiments and further developments of the invention can be taken from the dependent claims.
  • the invention is based on a cooking device device, in particular a cooktop device, preferably an induction cooktop device, with at least one mechanical switch, at least one driver circuit, which is provided for driving the at least one mechanical switch and which comprises a protection unit and a bridging unit, which in at least one Operating state is provided to the protection unit at least partially, in particular at least one, preferably discrete, component of the protection unit to bridge.
  • a cooking device device in particular a cooktop device, preferably an induction cooktop device, with at least one mechanical switch, at least one driver circuit, which is provided for driving the at least one mechanical switch and which comprises a protection unit and a bridging unit, which in at least one Operating state is provided to the protection unit at least partially, in particular at least one, preferably discrete, component of the protection unit to bridge.
  • the bridging unit is designed to be self-controlling.
  • a "cooking appliance device” is to be understood in particular as meaning at least one part, in particular a sub-assembly, of a cooking appliance, in particular a cooktop and preferably an induction cooktop.
  • the cooking appliance device may also comprise the entire cooking appliance, in particular the entire hob and preferably the entire induction hob.
  • the cooking appliance device comprises at least one inverter and at least one inductor, which is provided to be supplied by the at least one inverter with a high-frequency heating current.
  • the high-frequency heating current is provided in particular for heating, in particular cooking utensils, in particular by eddy current and / or magnetic reversal effects.
  • the cooking appliance device has a control unit.
  • the at least one mechanical switch is designed, in particular, as a contactor and / or preferably as a relay, and comprises in particular at least one drive coil and at least one armature element which is movable, in particular, by means of a magnetic field generated by the at least one driver coil.
  • the at least one mechanical switch can be used as a power switch, in particular SPST switch, DPST switch, SPCO switch and / or SPTT switch, and / or as a changeover switch, in particular SPDT switch, DPDT switch and / or DPCO switch be trained.
  • the at least one mechanical switch is preferably arranged between the at least one inverter and the at least one inductor and, in particular in at least one operating state, intended to interrupt and / or produce at least one conduction path between the at least one inverter and the at least one inductor.
  • a "conduction path" should be understood to mean in particular an electrically conductive connection between at least two points.
  • a "driver circuit” is to be understood in particular as a circuit which is provided to provide at least one switching current and / or at least one switching voltage for the at least one mechanical switch, in particular the at least one driver coil of the at least one mechanical switch.
  • the at least one driver circuit may only discrete components and in particular is free of ICs.
  • a "protective unit” is to be understood in particular as a unit and / or a circuit which is provided for at least one component, in particular of the at least one driver circuit, in particular in at least one fault operating state and / or in at least one switching state, in particular in at least one a shutdown of the at least one mechanical switch, in particular against an overcurrent and / or preferably to protect against overvoltage.
  • the protection unit may include at least one switch, at least one resistor, preferably a temperature-dependent resistor, in particular an NTC resistor and / or a PTC resistor, at least one fuse, at least one bimetallic element, at least one RC element, in particular a snubber element and or a sacredrot member, at least one varistor and / or preferably at least one diode.
  • the protection unit is provided to survive at least one switching operation, preferably each switching operation, of the at least one mechanical switch without damage.
  • a "switching operation” should be understood to mean, in particular, a process in which the at least one armature element of the at least one mechanical switch undergoes a movement and in which the at least one mechanical switch in particular changes its switch state.
  • the at least one mechanical switch is in a non-conductive and / or bouncing state during the at least one switching operation.
  • the at least one switching operation may comprise releasing at least one electrically conductive connection, which the switch has in at least one operating state, and / or one, in particular complete, producing at least one, in particular further, electrically conductive connection.
  • a "switching state” is to be understood as meaning, in particular, a state of the at least one mechanical switch and / or at least one control signal of the at least one mechanical switch, in particular at least one idle state, at least one on state, at least one hold state, and / or at least one turn off state.
  • the at least one idle state is defined in particular by a normal state, in particular an NC (normally closed) state and / or a NO (normally open) state.
  • the at least one switch-on state comprises, in particular, at least one supply of a voltage and / or a current for the at least one driver coil and / or supplying the at least one driver coil with energy, in particular with one Voltage and / or current, and / or at least one, preferably exactly one, switching operation, which preferably converts the at least one mechanical switch from a normal operating state to a working mode, in particular, the at least one anchor element of a normally closed contact merges into a normally open contact.
  • the at least one holding state comprises in particular a holding of the at least one mechanical switch, in particular of the at least one anchor element, preferably in the working operating state.
  • the at least one switch-off state comprises in particular at least one, preferably exactly one, switching operation, which preferably converts the at least one mechanical switch from a working operating state into a normal operating state, wherein in particular the at least one armature element transitions from a normally open contact into a normally closed contact, and / or at least one Dismantling an energy stored in the at least one drive coil, in particular a current and / or a voltage.
  • a "bridging unit” should be understood to mean, in particular, a unit and / or a circuit which is provided to bypass an object, in particular at least one, preferably discrete, component by means of an electrical connection.
  • the bridging unit in at least one operating state, provides at least one low-impedance conduction path, at least one low-resistance component and / or at least one component which is provided in at least one operating state to assume a low-resistance state.
  • the bridging unit can have at least one, preferably voltage-controlled, bypass switch, in particular a thyristor and / or a transistor, in particular a bipolar transistor and / or a MOSFET, which can be connected in parallel to the object.
  • the at least one bypass switch is designed as a unipolar switch and / or unidirectional switch.
  • the at least one bypass switch may also be bidirectional.
  • the expression "low resistance” should be understood as meaning, in particular, an electrical resistance of at most 10 ⁇ , advantageously of not more than 5 ⁇ , preferably of not more than 100 m ⁇ and particularly preferably of not more than 10 m ⁇ .
  • the fact that the at least one bridging unit is designed to be "self-controlling" is to be understood in particular to mean that the at least one bridging unit automatically and automatically, in particular depends on, at least one operating state a, in particular momentary, voltage value and / or current value of the at least one driver circuit changes.
  • the at least one bridging unit is free from a, in particular direct, connection to the control unit.
  • the bridging unit has at least two, preferably exactly two, bridging connections and at least one, preferably exactly one, control connection.
  • a "bridging connection” is to be understood as meaning, in particular, a connection, in particular an input and / or output, of the bridging unit, which is connected to at least one connection of at least one object to be bridged.
  • the at least two bridging connections are connected to one another in a low-resistance manner, at least in an operating state, in particular a bridging state.
  • the at least two bridging connections are connected to each other in a high-impedance manner, at least in a further operating state, in particular a different operating state, in particular the bypass state, in particular a blocking state.
  • the term "high-resistance” should be understood as meaning in particular an electrical resistance of at least 500 ⁇ , advantageously of at least 1 k ⁇ , preferably of at least 5 k ⁇ and particularly preferably of at least 10 k ⁇ .
  • a "control connection” should be understood to mean, in particular, a connection, in particular an input, of the bridging unit, which is provided, depending on at least one applied signal, in particular an electrical potential and / or a current, a state of the at least one bridging unit in particular, a presence and / or a nonexistence of a low-resistance connection between the at least two bridging terminals to change.
  • the at least one Control connection free from a, in particular direct, connection to the control unit.
  • the at least one control connection can be embodied identically, in particular, with at least one of the bridging connections. In this way, in particular, a cost-effective and compact bridging unit can be achieved, which in particular can be mounted quickly and easily.
  • the bridging unit is designed to be current-controlled, a simple and, in particular, autonomous control of the bridging unit can advantageously be achieved.
  • the bridging unit is intended to at least partially bridge the protective unit.
  • An "at least substantially vanishing current intensity” should be understood to mean in particular a current intensity of at most 500 mA, in particular of at most 100 mA, preferably of at most 10 mA and particularly advantageously of not more than 1 mA. In this way, in particular, a control of the bridging unit can be further simplified.
  • the bridging unit has at least one energy storage unit which, in at least one operating state, defines at least one, in particular temporal, parameter of a bridging of the protection unit.
  • an "energy storage unit” should be understood to mean in particular a unit which is provided in at least one operating state, in particular to store electrical energy.
  • the at least one energy storage unit can be designed, for example, as a battery, as an accumulator, as an inductance and / or advantageously as a capacitor. In this way, advantageously, a state of the bridging unit can be adapted to different control options.
  • the at least one parameter could, for example, be a bridging inertia.
  • a "bridging inertia” is to be understood in particular as meaning a time duration between a control and a start of the bridging.
  • the at least one parameter is given by a duration of the bridging.
  • the duration of the bridging is in particular maximum 500 ⁇ s, advantageously at most 100 ⁇ s, preferably at most 50 ⁇ s and particularly preferably at most 20 ⁇ s. In this way, in particular an adaptation of the bridging unit to different control variants can be simplified.
  • control unit is provided to provide at least one, preferably exactly one, control signal for controlling a switching state of the at least one mechanical switch.
  • control signal for controlling a switching state of the at least one mechanical switch.
  • the at least one control signal is at least partially a pulse width modulated signal.
  • the pulse width modulated signal may have different duty cycles for different time periods.
  • a "duty cycle” is to be understood as meaning in particular a ratio of a time duration in which a, preferably periodic, control signal of the control unit assumes a switch-on value, in particular a high level, to a period duration of the control signal. In this way, in particular a simple and advantageously efficient control of the at least one mechanical switch can be achieved.
  • an efficiency can be increased and a turn-off can be improved.
  • the protection unit comprises at least one consumer unit, in particular a resistor and / or preferably a Zener diode.
  • a shutdown of the at least one mechanical switch can be accelerated.
  • a temperature dependence of the at least one mechanical switch can be minimized.
  • bridging unit is provided to bridge the at least one consumer unit, a switch-off process of the at least one mechanical switch can advantageously be accelerated easily.
  • FIG. 1 shows an exemplary designed as an induction hob cooking device 32 in a schematic plan view.
  • the cooking appliance 32 has a hob plate with four heating zones 34 in the present case. Each heating zone 34 is intended to heat exactly one cookware element (not shown).
  • the cooking appliance 32 comprises a cooking appliance device.
  • the cooking appliance device has an operating unit 36.
  • the operating unit 36 serves to input and / or select a power level by a user.
  • the cooking device device comprises a control unit 28.
  • the control unit 28 has a computing unit, a memory unit and an operating program stored in the memory unit, which is intended to be executed by the computing unit.
  • FIG. 2 shows a schematic diagram of the cooking appliance device.
  • the cooking appliance device has four inductors 38, 40, 42, 44. Each inductor 38, 40, 42, 44 is associated with one of the heating zones 34.
  • the cooking appliance device comprises two Inverters 46, 48.
  • the inverters 46, 48 are formed identical to each other.
  • Each inverter 46, 48 has two semiconductor switches 50, 52, in particular IGBTs.
  • the control unit 28 is connected to control terminals of the semiconductor switches 50, 52 (not shown).
  • Each of the inverters 46, 48 is intended to convert a pulsed rectified mains voltage of a power source 54 into a high frequency heating current and in particular to supply at least one of the inductors 38, 40, 42, 44.
  • the cooking appliance device has a plurality of line paths 56.
  • each of the inverters 46, 48 is connected to the inductors 38, 40, 42, 44 via conductive paths 56.
  • the cooking appliance device further comprises two resonance units 58.
  • Each of the resonance units 58 is part of an electrical resonant circuit and can be charged via the associated inverter 46, 48.
  • the cooking appliance device has a switching arrangement 60.
  • the switch assembly 60 includes a plurality of mechanical switches 10, 12.
  • the mechanical switches 10, 12 are designed to interrupt and / or establish the conductive paths 56 between the inverters 46, 48 and the inductors 38, 40, 42, 44.
  • the switching arrangement 60 comprises six mechanical switches 10, 12.
  • the mechanical switches 10, 12 are identical.
  • the mechanical switches 10, 12 are designed as a changeover switch.
  • the mechanical switches 10, 12 are formed in the present case as a relay.
  • Each of the conductive paths 56 is interruptible by two mechanical switches 10, 12.
  • Two first mechanical switches 10 are each connected to a heating current output 62, 64 of the inverters 46, 48.
  • the two first mechanical switches 10 are each connected to two second mechanical switches 12.
  • the two second mechanical switches 12 are each connected to one of the inductors 38, 40, 42, 44.
  • the cooking appliance device has a plurality of driver circuits 14.
  • Each driver circuit 14 is provided for driving one of the mechanical switches 10, 12.
  • the driver circuits 14 are formed identical to one another in the present case.
  • Each of the mechanical switches 10, 12 is associated with one of the driver circuits 14.
  • Each of the mechanical switches 10, 12 is connected to one of the driver circuits 14.
  • at least one Driver circuit form differently.
  • at least two mechanical switches could be assigned a single driver circuit.
  • the cooking appliance device may comprise further units, in particular rectifiers, filters, detectors, in particular current detectors and / or voltage detectors, and / or voltage transformers.
  • FIG. 3 shows an exemplary schematic circuit diagram of one of the mechanical switches 10, 12 and one of the driver circuits 14 FIG. 2 , The following description is exemplary of one of the mechanical switches 10, 12 and can in particular be transferred to the other mechanical switches 10, 12.
  • the mechanical switch 10, 12 has an anchor element 70.
  • the anchor element 70 is made of a ferromagnetic material.
  • the mechanical switch 10, 12 has a driver coil 72.
  • the driver coil 72 has a ferromagnetic core.
  • a driver coil may also be formed without a ferromagnetic core and / or have a core of a different material.
  • the drive coil 72 is provided in at least one operating state to attract the anchor member 70, in particular by a magnetic force.
  • the mechanical switch 10, 12 has three contacts.
  • a first contact is designed as a switching contact 74.
  • the switching contact 74 is indirectly and / or directly connected to one of the two Walkerstromaus réelle 62, 64.
  • a second contact is designed as a normally closed contact 76.
  • the normally closed contact 76 is indirectly and / or directly connected to one of the inductors 38, 40, 42, 44.
  • a third contact is designed as a normally open contact 78.
  • the normally open contact 78 is indirectly and / or directly connected to one of the inductors 38, 40, 42, 44.
  • the driver circuit 14 comprises a driver unit 66.
  • the driver unit 66 is used to drive the driver circuit 14.
  • the driver unit 66 is provided to control a function of the driver circuit 14.
  • the driver unit 66 has three terminals.
  • the driver circuit 14 has a protection unit 16.
  • the protection unit 16 is intended to protect the mechanical switch 10, 12 from overvoltage.
  • the protection unit 16 is provided to protect the driver unit 66 from overvoltage.
  • the protection unit 16 has three Connections on.
  • the driver circuit 14 further includes a bypass unit 18.
  • the bridging unit 18 has three terminals 20, 22, 24. In the present case, the bridging unit 18 has two bridging connections 20, 22 and a control connection 24.
  • the cooking appliance device has a supply unit (not shown).
  • the supply unit is provided to provide a supply voltage for the driver circuit 14.
  • a supply connection 68 is connected to the driver circuit 14.
  • the mechanical switch 10, 12 is connected to the driver circuit 14.
  • the mechanical switch 10, 12 has two connections.
  • the supply terminal 68 is connected to a first terminal of the drive coil 72.
  • the supply terminal 68 is connected to a first terminal of the protection unit 16. Furthermore, the supply connection 68 is connected to the control connection 24 of the bridging unit 18.
  • the first terminal of the driver coil 72 is connected to a first terminal of the protection unit 16. Furthermore, the first terminal of the driver coil 72 is connected to the control terminal 24 of the bridging unit 18. A second terminal of the driver coil 72 is connected to a first terminal of the driver unit 66. The second terminal of the driver coil 72 is connected to a third terminal of the protection unit 16. Furthermore, the second terminal of the driver coil 72 is connected to the second bridging terminal 22 of the bridging unit 18.
  • the first terminal of the protection unit 16 is connected to the control terminal 24 of the bridging unit 18.
  • a second terminal of the protection unit 16 is connected to the first bridging terminal 20 of the bridging unit 18.
  • the third terminal of the protection unit 16 is connected to the second bridging terminal 22 of the bridging unit 18. Furthermore, the third terminal of the protection unit 16 is connected to the first terminal of the driver unit 66.
  • the second bridging terminal 22 of the bridging unit 18 is further connected to the first terminal of the driver unit 66.
  • a second terminal of the driver unit 66 is connected to the control unit 28.
  • a third one Connection of the driver unit 66 connected to a ground fault.
  • a third terminal of a driver unit may also be grounded.
  • the driver unit 66 has at least one control switch 80.
  • the control switch 80 is formed in the present case as a bipolar transistor.
  • the control switch 80 is connected to a base contact via a resistor to the second terminal of the driver unit 66. Further, the control switch 80 is connected to the ground terminal with an emitter contact.
  • the control switch 80 is connected to a collector contact with the first terminal of the driver unit 66.
  • the driver unit 66 may have at least one further component, in particular at least one electrical resistance and / or at least one capacitor.
  • the protection unit 16 has a freewheeling diode 82. Furthermore, the protection unit 16 has a load unit 30.
  • the consumer unit 30 is formed in the present case as a Zener diode.
  • the freewheeling diode 82 is connected to a cathode contact with the first terminal of the protection unit 16.
  • the freewheeling diode 82 is connected to the second terminal of the protection unit 16 with an anode contact.
  • the consumer unit 30 is connected to the third terminal of the protection unit 16 with a first contact, in particular a cathode contact.
  • the consumer unit 30 is connected to the second terminal of the protection unit 16 with a second contact, in particular an anode contact.
  • the consumer unit 30 is connected to the second contact, in particular the anode contact, with the anode contact of the freewheeling diode 82.
  • the bridging unit 18 has at least one bridging switch 84 in the present case. Furthermore, the bridging unit 18 has an energy storage unit 26. The energy storage unit 26 is formed in the present case as a capacitor. The energy storage unit 26 is in operative connection with the bridging switch 84. Furthermore, the bridging unit 18 can have at least one further component, in particular at least one electrical resistance and / or at least one capacitor.
  • the bridging unit 18 is intended to at least partially bridge the protection unit 16 in at least one operating state.
  • the bridging unit 18 is designed to be self-controlling. Accordingly, the bridging unit 18 is free of direct connections to the control unit 28.
  • the bridging unit 18 is provided to bridge the load unit 30 in the at least one operating state.
  • the bypass switch 84 is provided to bypass the load unit 30 in the at least one operating state.
  • the bridging unit 18 is designed to be current-controlled. In this case, a bridging state of the bridging unit 18 may be changed depending on a current flowing through the control terminal 24 of the bridging unit 18.
  • control unit 28 is provided to provide a control signal for controlling a switching state of the mechanical switch 10, 12.
  • the control signal of the control unit 28 is applied to the second terminal of the driver unit 66.
  • FIG. 4 shows a schematic diagram of the control signal for controlling a switching state of the mechanical switch 10, 12 and associated switching operations of the mechanical switch 10, 12.
  • an abscissa axis 86 the time is shown.
  • An ordinate axis 88 is shown as a size axis.
  • a curve 90 shows the control signal provided by the control unit 28.
  • the control signal is given in the present case, at least partially by a pulse width modulated signal. Accordingly, the control signal can assume at least a high level and at least a low level.
  • a curve 92 illustrates the switching operations.
  • a "1" level defines a conductive connection between the switch contact 74 and the normally closed contact 76 of the mechanical switch 10, 12.
  • a "-1" level defines a conductive connection between the switch contact 74 and the make contact 78 of the mechanical switch 10, 12.
  • a "0" level defines a non-conductive state.
  • the control signal has the low level.
  • the control switch 80 is open and therefore non-conductive. In this case, no current flows into the control connection 24 of the bridging unit 18 In this case, the bridging terminals 20, 22 are connected with high resistance.
  • the bypass switch 84 is non-conductive.
  • the drive coil 72 is current-free.
  • the switching contact 74 of the mechanical switch 10, 12 is conductively connected to the normally closed contact 76.
  • the control signal changes.
  • the control signal has the high level.
  • the control switch 80 is closed and therefore conductive.
  • a partial current flows into the control terminal 24 of the bridging unit 18.
  • the bridging terminals 20, 22 are connected to low resistance.
  • the bypass switch 84 is conductive.
  • the split current may flow through the bypass switch 84 and the control switch 80 to the ground terminal.
  • the partial flow can flow to the ground connection through the consumer unit 30, which is connected in particular in the forward direction, and the control switch 80.
  • the partial flow which flows through the bridging unit 18 is further provided to charge the energy storage unit 26.
  • a switching current flows through the driving coil 72.
  • the switching current flows through the driving coil 72 and the control switch 80 to the ground terminal.
  • a maximum average current flows through the driver coil 72.
  • the anchor member 70 changes its position, so that the switching contact 74 is conductively connected to the normally open contact 78.
  • the second time interval t 2 has a time duration of 100 ms in the present case.
  • the switching process begins at a time T S1 .
  • the switching process ends at a time T S2.
  • a switching operation in the present case has a duration of 10 ms.
  • the control unit 28 is provided to deactivate the inverters 46, 48 at least during the switching operation.
  • the control signal changes. From the time T 2 , the control signal is given by a pulse width modulated signal. A duty cycle of the control signal has a value of 0.7. During an entire third time interval t 3 , the control signal has the duty cycle with the value 0.7. Furthermore, the control signal has a frequency of 25 kHz. In this hold state, the control signal causes the control switch 80 to be alternately closed and opened is. At a high level of the control signal, an operation analogous to the on state takes place. At a low level of the control signal, the control switch 80 is opened and therefore non-conductive. In this case, no current flows into the control terminal 24 of the bridging unit 18.
  • the bridging unit 18 is provided in this case, in particular a case of a vanishing current through the control terminal 24, to at least partially bridge the protection unit 16.
  • the bridging unit 18 is provided to bridge the consumer unit 30.
  • a charge of the energy storage unit 26 ensures that the bypass switch 84 is conductive.
  • the bridging terminals 20, 22 are connected to low resistance.
  • the energy storage unit 26 is provided to define a parameter of a bypass of the protection unit 16.
  • the parameter is given by a period of bridging.
  • the duration of the bridging corresponds to the maximum time duration in which the bridging terminals 20, 22 are connected to low impedance at vanishing current intensity at the control terminal 24.
  • the duration of the bridging corresponds in the present case just a time duration of the low level of the pulse width modulated signal.
  • the bridging time corresponds to 12 ⁇ s in the present case.
  • Due to the sudden switching off of the current a high induction voltage occurs through the driver coil 72.
  • the protection unit 16 and / or the bridging unit 18 are intended to reduce this induction voltage.
  • a loop current caused by the induction voltage flows through the bypass unit 18, the flywheel diode 82, and the drive coil 72. In this case, the circulating current flows through the bypass switch 84, the flywheel diode 82, and the drive coil 72.
  • a mean current flows through the driver coil 72.
  • the average current corresponds to a, in particular minimal, required holding current.
  • the anchor element 70 can be held on the working contact 78.
  • the switching contact 74 is conductively connected to the normally open contact 78. This can increase efficiency and self-heating of the mechanical switch 10, 12 can be reduced.
  • the control signal changes.
  • the control signal has the low level.
  • the Control switch 80 is opened and therefore non-conductive.
  • an analog operation takes place relative to the low level of the hold state.
  • the bypass switch 84 changes to a non-conductive state.
  • the bridging terminals 20, 22 are connected with high resistance.
  • the bypass switch 84 is non-conductive.
  • the protection unit 16 is intended to reduce the resulting induction voltage. A circulating current caused by the induction voltage flows through the load unit 30, the freewheeling diode 82 and the drive coil 72.
  • FIG. 5 shows the schematic diagram FIG. 3 with an exemplary embodiment of the bridging unit 18. In the following, only the design of the bridging unit 18 will be described.
  • the bypass switch 84 is formed in the present case as a bipolar transistor.
  • the designed as a capacitor energy storage unit 26 has in the present case has a capacity of about 200 nF.
  • the control terminal 24 of the bridging unit 18 is connected to a first contact of a first resistor 94 of the bridging unit 18.
  • a second contact of the first resistor 94 is connected to a base contact of the bypass switch 84.
  • the second contact of the first resistor 94 is connected to a first contact of the energy storage unit 26.
  • the second contact of the first resistor 94 is connected to a first contact of a second resistor 96 of the bridging unit 18.
  • the first contact of the energy storage unit 26 is connected to the first contact of the second resistor 96.
  • the first contact of the energy storage unit 26 is connected to the base contact of the bypass switch 84.
  • the first contact of the second resistor 96 is connected to the base contact of the bypass switch 84.
  • a second contact of the energy storage unit 26 is connected to a second contact of the second resistor 96.
  • the second contact of the energy storage unit 26 is further connected to the first bridging terminal 20.
  • the second contact of the energy storage unit 26 is connected to an emitter contact of the bypass switch 84.
  • the second contact of the second resistor 96 is connected to the first bypass terminal 20.
  • the second contact of the second resistor 96 is connected to an emitter contact of the bypass switch 84.
  • a collector contact of the bypass switch 84 is connected to the second bypass terminal 22.
  • the second resistor 96 is connected in parallel with the energy storage unit 26. Further, the bypass switch 84 is connected in parallel to the load unit 30.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Electronic Switches (AREA)
  • Relay Circuits (AREA)
  • Inverter Devices (AREA)

Description

Die Erfindung geht aus von einer Gargerätevorrichtung nach dem Oberbegriff des Anspruchs 1.The invention is based on a cooking device device according to the preamble of claim 1.

Aus dem Stand der Technik sind Kochfelder bekannt, die ein Relais sowie einen Treiberschaltkreis, welcher zu einer Ansteuerung des Relais vorgesehen ist, umfassen, wobei der Treiberschaltkreis eine Überspannungsschutzbeschaltung, welche eine Freilaufdiode sowie eine Zenerdiode umfasst, und einen die Zenerdiode überbrückenden Schalter aufweist. Ferner ist eine Steuereinheit dazu vorgesehen, den Schalter in zumindest einem Betriebszustand direkt durch ein Steuersignal anzusteuern, um die Zenerdiode zu überbrücken.Cooking hobs are known from the prior art, which comprise a relay and a driver circuit which is provided for driving the relay, wherein the driver circuit comprises a surge protection circuit comprising a freewheeling diode and a zener diode, and a switch bridging the zener diode. Furthermore, a control unit is provided to control the switch in at least one operating state directly by a control signal in order to bridge the Zener diode.

Aus der internationalen Patentanmeldung WO 2010/069788 A1 ist ein Kochfeld bekannt mit zumindest einem Induktor, wenigstens einem Wechselrichter, einer Schaltvorrichtung und einem Detektionsschaltkreis zum Detektieren von Kochgeschirr, wobei die Schaltvorrichtung in einem Stromkreis zwischen dem Induktor und dem Wechselrichter angeordnet ist, sodass die Schaltvorrichtung in einer ersten Schaltstellung eine Verbindung zwischen dem Wechselrichter und dem Induktor herstellt und die Verbindung zwischen dem Wechselrichter und dem Induktor in wenigstens einer zweiten Schaltstellung unterbricht. Die Schaltvorrichtung ist derart mit dem Detektionsschaltkreis verbunden, dass die Schaltvorrichtung in der wenigstens einen zweiten Schaltstellung den Induktor mit dem Detektionsschaltkreis verbindet.From the international patent application WO 2010/069788 A1 a hob is known with at least one inductor, at least one inverter, a switching device and a detection circuit for detecting cookware, wherein the switching device is arranged in a circuit between the inductor and the inverter, so that the switching device in a first switching position a connection between the inverter and the inductor and breaks the connection between the inverter and the inductor in at least a second switching position. The switching device is connected to the detection circuit in such a way that the switching device in the at least one second switching position connects the inductor to the detection circuit.

Die internationale Patentanmeldung WO 2012/063159 A1 offenbart eine Heizvorrichtung, insbesondere eine Kochfeldheizvorrichtung, mit wenigstens einem Heizanschluss für zumindest ein Heizelement und wenigstens einer Frequenzeinheit. Die Heizvorrichtung umfasst eine Schutzeinheit, die dazu vorgesehen ist, eine Existenz eines Leitungspfads zwischen der Frequenzeinheit und dem Heizanschluss zu ermitteln.The international patent application WO 2012/063159 A1 discloses a heating device, in particular a cooktop heating device, with at least one heating connection for at least one heating element and at least one frequency unit. The heater includes a protection unit configured to detect existence of a conduction path between the frequency unit and the heater terminal.

Aus der internationalen Patentanmeldung WO 2011/135470 A1 ist eine Kochmuldenvorrichtung, insbesondere eine Induktionskochmuldenvorrichtung, mit zumindest einer Schalteinheit, mittels der wenigstens eine Stromzuleitung unterbrechbar und herstellbar ist, durch die bei wenigstens einem Betriebsvorgang ein mittels einer Stromnetzspannung generierter Strom fließt und die zu einem ersten Schaltelement führt, und mit zumindest einer Steuervorrichtung, welche bei dem Betriebsvorgang die Schalteinheit derart steuert, dass die Schalteinheit die Stromzuleitung während wenigstens eines ersten gesamten Zeitintervalls unterbricht, und welche bei dem Betriebsvorgang veranlasst, dass unmittelbar vor und unmittelbar nach dem ersten Zeitintervall die Stromzuleitung hergestellt ist, und welche ein Schalten des ersten Schaltelements veranlasst, das während des ersten Zeitintervalls beginnt und endet. Das erste Zeitintervall ist kleiner als eine halbe Periodendauer der Stromnetzspannung.From the international patent application WO 2011/135470 A1 is a Kochmuldenvorrichtung, in particular a Induktionskochmuldenvorrichtung, with at least one switching unit, by means of which at least one power supply line can be interrupted and produced, through which at least one operating operation generates a current generated by means of a power supply voltage and which leads to a first switching element, and with at least one control device which controls the switching unit in such a way in the operating process, in that the switching unit interrupts the power supply line during at least a first entire time interval, and which causes the power supply to be established immediately before and immediately after the first time interval, and which causes a switching of the first switching element that starts during the first time interval and ends. The first time interval is less than half the period of the mains voltage.

Die Aufgabe der Erfindung besteht insbesondere darin, eine gattungsgemäße Gargerätevorrichtung mit verbesserten Eigenschaften hinsichtlich einer Effizienz und/oder einer Ansteuerung bereitzustellen. Die Aufgabe wird durch die kennzeichnenden Merkmale des Patentanspruchs 1 gelöst, während vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung den Unteransprüchen entnommen werden können.The object of the invention is in particular to provide a generic Gargerätevorrichtung with improved properties in terms of efficiency and / or a control. The object is solved by the characterizing features of claim 1, while advantageous embodiments and further developments of the invention can be taken from the dependent claims.

Die Erfindung geht aus von einer Gargerätevorrichtung, insbesondere einer Kochfeldvorrichtung, vorzugsweise einer Induktionskochfeldvorrichtung, mit zumindest einem mechanischen Schalter, zumindest einem Treiberschaltkreis, welcher zu einer Ansteuerung des zumindest einen mechanischen Schalters vorgesehen ist und welcher eine Schutzeinheit und eine Überbrückungseinheit umfasst, welche in zumindest einem Betriebszustand dazu vorgesehen ist, die Schutzeinheit zumindest teilweise, insbesondere zumindest ein, vorzugsweise diskretes, Bauteil der Schutzeinheit, zu überbrücken.The invention is based on a cooking device device, in particular a cooktop device, preferably an induction cooktop device, with at least one mechanical switch, at least one driver circuit, which is provided for driving the at least one mechanical switch and which comprises a protection unit and a bridging unit, which in at least one Operating state is provided to the protection unit at least partially, in particular at least one, preferably discrete, component of the protection unit to bridge.

Es wird vorgeschlagen, dass die Überbrückungseinheit selbststeuernd ausgebildet ist.It is proposed that the bridging unit is designed to be self-controlling.

Unter einer "Gargerätevorrichtung" soll insbesondere zumindest ein Teil, insbesondere eine Unterbaugruppe, eines Gargeräts, insbesondere eines Kochfelds und vorzugsweise eines Induktionskochfelds, verstanden werden. Insbesondere kann die Gargerätevorrichtung auch das gesamte Gargerät, insbesondere das gesamte Kochfeld und vorzugsweise das gesamte Induktionskochfeld, umfassen. Vorzugsweise umfasst die Gargerätevorrichtung zumindest einen Wechselrichter und zumindest einen Induktor, welcher dazu vorgesehen ist, von dem zumindest einen Wechselrichter mit einem hochfrequentem Heizstrom versorgt zu werden. Der hochfrequente Heizstrom ist insbesondere zu einem Erhitzen, insbesondere von Gargeschirr, insbesondere durch Wirbelstrom- und/oder Ummagnetisierungseffekte, vorgesehen. Insbesondere weist die Gargerätevorrichtung eine Steuereinheit auf. Unter "vorgesehen" soll insbesondere speziell programmiert, ausgelegt und/oder ausgestattet verstanden werden. Darunter, dass ein Objekt zu einer bestimmten Funktion vorgesehen ist, soll insbesondere verstanden werden, dass das Objekt diese bestimmte Funktion in zumindest einem Anwendungs- und/oder Betriebszustand erfüllt und/oder ausführt. Der zumindest eine mechanische Schalter ist insbesondere als Schütz und/oder vorzugsweise als Relais ausgebildet und umfasst insbesondere zumindest eine Treiberspule und zumindest ein insbesondere mittels eines durch die zumindest eine Treiberspule erzeugten Magnetfelds bewegbares Ankerelement. Insbesondere kann der zumindest eine mechanische Schalter dabei als Einschalter, insbesondere SPST-Schalter, DPST-Schalter, SPCO-Schalter und/oder SPTT-Schalter, und/oder als Wechselschalter, insbesondere SPDT-Schalter, DPDT-Schalter und/oder DPCO-Schalter, ausgebildet sein. Der zumindest eine mechanische Schalter ist dabei vorzugsweise zwischen dem zumindest einen Wechselrichter und dem zumindest einen Induktor angeordnet und insbesondere in zumindest einem Betriebszustand dazu vorgesehen, wenigstens einen Leitungspfad zwischen dem zumindest einen Wechselrichter und dem zumindest einen Induktor zu unterbrechen und/oder herzustellen. In diesem Zusammenhang soll unter einem "Leitungspfad" insbesondere eine elektrisch leitende Verbindung zwischen wenigstens zwei Punkten verstanden werden. Ferner soll unter einem "Treiberschaltkreis" insbesondere ein Schaltkreis verstanden werden, der dazu vorgesehen ist, zumindest einen Schaltstrom und/oder zumindest eine Schaltspannung für den zumindest einen mechanischen Schalter, insbesondere die zumindest eine Treiberspule des zumindest einen mechanischen Schalters, bereitzustellen. Insbesondere kann der zumindest eine Treiberschaltkreis lediglich diskrete Bauteile aufweisen und ist insbesondere frei von ICs. Unter einer "Schutzeinheit" soll insbesondere eine Einheit und/oder ein Schaltkreis verstanden werden, welche/welcher dazu vorgesehen ist, zumindest ein Bauteil, insbesondere des zumindest einen Treiberschaltkreises, insbesondere in zumindest einem Fehlerbetriebszustand und/oder in zumindest einem Schaltzustand, insbesondere in zumindest einem Abschaltzustand des zumindest einen mechanischen Schalters, insbesondere vor einem Überstrom und/oder vorzugsweise vor einer Überspannung, zu schützen. Die Schutzeinheit kann dabei zumindest einen Schalter, zumindest einen Widerstand, vorzugsweise einen temperaturabhängigen Widerstand, insbesondere einen NTC-Widerstand und/oder einen PTC-Widerstand, zumindest eine Schmelzsicherung, zumindest ein Bimetallelement, zumindest ein RC-Glied, insbesondere ein Snubber-Glied und/oder ein Boucherot-Glied, zumindest einen Varistor und/oder vorzugsweise zumindest eine Diode umfassen. Vorzugsweise ist die Schutzeinheit dazu vorgesehen, zumindest einen Schaltvorgang, vorzugsweise jeden Schaltvorgang, des zumindest einen mechanischen Schalters unbeschadet zu überstehen. In diesem Zusammenhang soll unter einem "Schaltvorgang" insbesondere ein Vorgang verstanden werden, in welchem das zumindest eine Ankerelement des zumindest einen mechanischen Schalters eine Bewegung erfährt und in welchem der zumindest eine mechanische Schalter insbesondere seinen Schalterzustand ändert. Insbesondere befindet sich der zumindest eine mechanische Schalter während des zumindest einen Schaltvorgangs in einem nicht-leitenden und/oder in einem prellenden Zustand. Insbesondere kann der zumindest eine Schaltvorgang ein Lösen wenigstens einer elektrisch leitenden Verbindung, welche der Schalter in wenigstens einem Betriebszustand aufweist, und/oder ein, insbesondere vollständiges, Herstellen zumindest einer, insbesondere weiteren, elektrisch leitenden Verbindung umfassen. Ferner soll unter einem "Schaltzustand" insbesondere ein Zustand des zumindest einen mechanischen Schalters und/oder zumindest eines Steuersignals des zumindest einen mechanischen Schalters, insbesondere zumindest ein Ruhezustand, zumindest ein Einschaltzustand, zumindest ein Haltezustand und/oder zumindest ein Abschaltzustand, verstanden werden. Der zumindest eine Ruhezustand ist dabei insbesondere durch einen Normalzustand, insbesondere einen NC (normally closed)-Zustand und/oder einen NO (normally open)-Zustand, definiert. Der zumindest eine Einschaltzustand umfasst insbesondere zumindest ein Bereitstellen einer Spannung und/oder eines Stroms für die zumindest eine Treiberspule und/oder ein Versorgen der zumindest einen Treiberspule mit Energie, insbesondere mit einer Spannung und/oder einem Strom, und/oder zumindest einen, vorzugsweise genau einen, Schaltvorgang, welcher vorzugsweise den zumindest einen mechanischen Schalter von einem Normalbetriebszustand in einen Arbeitsbetriebszustand überführt, wobei insbesondere das zumindest eine Ankerelement von einem Ruhekontakt in einen Arbeitskontakt übergeht. Der zumindest eine Haltezustand umfasst insbesondere ein Halten des zumindest einen mechanischen Schalters, insbesondere des zumindest einen Ankerelements, vorzugsweise in dem Arbeitsbetriebszustand. Ferner umfasst der zumindest eine Abschaltzustand insbesondere zumindest einen, vorzugsweise genau einen, Schaltvorgang, welcher vorzugsweise den zumindest einen mechanischen Schalter von einem Arbeitsbetriebszustand in einen Normalbetriebszustand überführt, wobei insbesondere das zumindest eine Ankerelement von einem Arbeitskontakt in einen Ruhekontakt übergeht, und/oder zumindest ein Abbauen einer, insbesondere in der zumindest einen Treiberspule gespeicherten, Energie, insbesondere eines Stroms und/oder einer Spannung. Ferner soll unter einer "Überbrückungseinheit" insbesondere eine Einheit und/oder ein Schaltkreis verstanden werden, welche/welcher dazu vorgesehen ist, ein Objekt, insbesondere zumindest ein, vorzugsweise diskretes, Bauteil durch eine elektrische Verbindung zu umgehen. Insbesondere stellt die Überbrückungseinheit in zumindest einem Betriebszustand zumindest einen niederohmigen Leitungspfad, zumindest ein niederohmiges Bauteil und/oder zumindest ein Bauteil, welches in zumindest einem Betriebszustand dazu vorgesehen ist, einen niederohmigen Zustand einzunehmen, bereit. Vorteilhaft kann die Überbrückungseinheit zumindest einen, vorzugsweise spannungsgesteuerten, Überbrückungsschalter, insbesondere einen Thyristor und/oder einen Transistor, insbesondere einen Bipolartransistor und/oder einen MOSFET, aufweisen, welcher insbesondere parallel zu dem Objekt geschaltet sein kann. Vorzugsweise ist der zumindest eine Überbrückungsschalter als unipolarer Schalter und/oder unidirektionaler Schalter ausgebildet. Alternativ kann der zumindest eine Überbrückungsschalter jedoch auch bidirektional ausgebildet sein. Unter dem Ausdruck "niederohmig" soll in diesem Zusammenhang insbesondere ein elektrischer Widerstand von maximal 10 Ω, vorteilhaft von maximal 5 Ω, vorzugsweise von maximal 100 mΩ und besonders bevorzugt von maximal 10 mΩ verstanden werden. Darunter, dass die zumindest eine Überbrückungseinheit "selbststeuernd" ausgebildet ist, soll insbesondere verstanden werden, dass die zumindest eine Überbrückungseinheit in zumindest einem Betriebszustand, ihren Zustand automatisch und selbsttätig, insbesondere abhängig von einem, insbesondere momentanen, Spannungswert und/oder Stromwert des zumindest einen Treiberschaltkreises, ändert. Insbesondere ist die zumindest eine Überbrückungseinheit frei von einer, insbesondere direkten, Verbindung zu der Steuereinheit. Durch diese Ausgestaltung kann eine gattungsgemäße Gargerätevorrichtung mit verbesserten Eigenschaften hinsichtlich einer Effizienz sowie einer Ansteuerung bereitgestellt werden. Ferner können vorteilhaft Überspannungen insbesondere an dem zumindest einen mechanischen Schalter vermieden und somit insbesondere sensible Bauteile geschützt werden. Insbesondere kann ein Abschaltvorgang des zumindest einen mechanischen Schalters beschleunigt und vorteilhaft eine Temperaturabhängigkeit des zumindest einen mechanischen Schalters minimiert werden. Des Weiteren kann eine verringerte Selbsterwärmung des zumindest einen mechanischen Schalters erreicht und Kosten minimiert werden.
Vorzugsweise weist die Überbrückungseinheit zumindest zwei, vorzugsweise genau zwei, Überbrückungsanschlüsse und zumindest einen, vorzugsweise genau einen, Steueranschluss auf. Unter einem "Überbrückungsanschluss" soll in diesem Zusammenhang insbesondere ein Anschluss, insbesondere ein Eingang und/oder Ausgang, der Überbrückungseinheit verstanden werden, welcher mit zumindest einem Anschluss zumindest eines zu überbrückenden Objekts verbunden ist. Insbesondere sind die zumindest zwei Überbrückungsanschlüsse zumindest in einem Betriebszustand, insbesondere einem Überbrückungszustand, niederohmig miteinander verbunden. Ferner sind die zumindest zwei Überbrückungsanschlüsse zumindest in einem weiteren, insbesondere von dem zumindest einen Betriebszustand, insbesondere dem Überbrückungszustand, verschiedenen Betriebszustand, insbesondere einem Sperrzustand, hochohmig miteinander verbunden. Unter dem Ausdruck "hochohmig" soll in diesem Zusammenhang insbesondere ein elektrischer Widerstand von zumindest 500 Ω, vorteilhaft von zumindest 1 kΩ, vorzugsweise von zumindest 5 kΩ und besonders bevorzugt von zumindest 10 kΩ verstanden werden. Unter einem "Steueranschluss" soll in diesem Zusammenhang insbesondere ein Anschluss, insbesondere ein Eingang, der Überbrückungseinheit verstanden werden, welcher dazu vorgesehen ist, abhängig von zumindest einem anliegenden Signal, insbesondere einem elektrischen Potential und/oder einem Strom, einen Zustand der zumindest einen Überbrückungseinheit, insbesondere ein Vorhandensein und/oder ein Nichtvorhandensein einer niederohmigen Verbindung zwischen den zumindest zwei Überbrückungsanschlüssen, zu verändern. Insbesondere ist der zumindest eine Steueranschluss frei von einer, insbesondere direkten, Verbindung mit der Steuereinheit. Ferner kann der zumindest eine Steueranschluss insbesondere mit zumindest einem der Überbrückungsanschlüsse identisch ausgebildet sein. Hierdurch kann insbesondere eine kostengünstige und kompakte Überbrückungseinheit erreicht werden, welche insbesondere schnell und einfach montiert werden kann.A "cooking appliance device" is to be understood in particular as meaning at least one part, in particular a sub-assembly, of a cooking appliance, in particular a cooktop and preferably an induction cooktop. In particular, the cooking appliance device may also comprise the entire cooking appliance, in particular the entire hob and preferably the entire induction hob. Preferably, the cooking appliance device comprises at least one inverter and at least one inductor, which is provided to be supplied by the at least one inverter with a high-frequency heating current. The high-frequency heating current is provided in particular for heating, in particular cooking utensils, in particular by eddy current and / or magnetic reversal effects. In particular, the cooking appliance device has a control unit. By "provided" is intended to be understood in particular specially programmed, designed and / or equipped. The fact that an object is intended for a specific function should in particular mean that the object fulfills and / or executes this specific function in at least one application and / or operating state. The at least one mechanical switch is designed, in particular, as a contactor and / or preferably as a relay, and comprises in particular at least one drive coil and at least one armature element which is movable, in particular, by means of a magnetic field generated by the at least one driver coil. In particular, the at least one mechanical switch can be used as a power switch, in particular SPST switch, DPST switch, SPCO switch and / or SPTT switch, and / or as a changeover switch, in particular SPDT switch, DPDT switch and / or DPCO switch be trained. The at least one mechanical switch is preferably arranged between the at least one inverter and the at least one inductor and, in particular in at least one operating state, intended to interrupt and / or produce at least one conduction path between the at least one inverter and the at least one inductor. In this context, a "conduction path" should be understood to mean in particular an electrically conductive connection between at least two points. Furthermore, a "driver circuit" is to be understood in particular as a circuit which is provided to provide at least one switching current and / or at least one switching voltage for the at least one mechanical switch, in particular the at least one driver coil of the at least one mechanical switch. In particular, the at least one driver circuit may only discrete components and in particular is free of ICs. A "protective unit" is to be understood in particular as a unit and / or a circuit which is provided for at least one component, in particular of the at least one driver circuit, in particular in at least one fault operating state and / or in at least one switching state, in particular in at least one a shutdown of the at least one mechanical switch, in particular against an overcurrent and / or preferably to protect against overvoltage. The protection unit may include at least one switch, at least one resistor, preferably a temperature-dependent resistor, in particular an NTC resistor and / or a PTC resistor, at least one fuse, at least one bimetallic element, at least one RC element, in particular a snubber element and or a boucherot member, at least one varistor and / or preferably at least one diode. Preferably, the protection unit is provided to survive at least one switching operation, preferably each switching operation, of the at least one mechanical switch without damage. In this context, a "switching operation" should be understood to mean, in particular, a process in which the at least one armature element of the at least one mechanical switch undergoes a movement and in which the at least one mechanical switch in particular changes its switch state. In particular, the at least one mechanical switch is in a non-conductive and / or bouncing state during the at least one switching operation. In particular, the at least one switching operation may comprise releasing at least one electrically conductive connection, which the switch has in at least one operating state, and / or one, in particular complete, producing at least one, in particular further, electrically conductive connection. Furthermore, a "switching state" is to be understood as meaning, in particular, a state of the at least one mechanical switch and / or at least one control signal of the at least one mechanical switch, in particular at least one idle state, at least one on state, at least one hold state, and / or at least one turn off state. The at least one idle state is defined in particular by a normal state, in particular an NC (normally closed) state and / or a NO (normally open) state. The at least one switch-on state comprises, in particular, at least one supply of a voltage and / or a current for the at least one driver coil and / or supplying the at least one driver coil with energy, in particular with one Voltage and / or current, and / or at least one, preferably exactly one, switching operation, which preferably converts the at least one mechanical switch from a normal operating state to a working mode, in particular, the at least one anchor element of a normally closed contact merges into a normally open contact. The at least one holding state comprises in particular a holding of the at least one mechanical switch, in particular of the at least one anchor element, preferably in the working operating state. Furthermore, the at least one switch-off state comprises in particular at least one, preferably exactly one, switching operation, which preferably converts the at least one mechanical switch from a working operating state into a normal operating state, wherein in particular the at least one armature element transitions from a normally open contact into a normally closed contact, and / or at least one Dismantling an energy stored in the at least one drive coil, in particular a current and / or a voltage. Furthermore, a "bridging unit" should be understood to mean, in particular, a unit and / or a circuit which is provided to bypass an object, in particular at least one, preferably discrete, component by means of an electrical connection. In particular, in at least one operating state, the bridging unit provides at least one low-impedance conduction path, at least one low-resistance component and / or at least one component which is provided in at least one operating state to assume a low-resistance state. Advantageously, the bridging unit can have at least one, preferably voltage-controlled, bypass switch, in particular a thyristor and / or a transistor, in particular a bipolar transistor and / or a MOSFET, which can be connected in parallel to the object. Preferably, the at least one bypass switch is designed as a unipolar switch and / or unidirectional switch. Alternatively, however, the at least one bypass switch may also be bidirectional. In this context, the expression "low resistance" should be understood as meaning, in particular, an electrical resistance of at most 10 Ω, advantageously of not more than 5 Ω, preferably of not more than 100 mΩ and particularly preferably of not more than 10 mΩ. The fact that the at least one bridging unit is designed to be "self-controlling" is to be understood in particular to mean that the at least one bridging unit automatically and automatically, in particular depends on, at least one operating state a, in particular momentary, voltage value and / or current value of the at least one driver circuit changes. In particular, the at least one bridging unit is free from a, in particular direct, connection to the control unit. With this embodiment, a generic Gargerätevorrichtung can be provided with improved properties in terms of efficiency and control. Furthermore, it is advantageously possible to avoid overvoltages, in particular at the at least one mechanical switch, and thus, in particular, to protect sensitive components. In particular, a switch-off process of the at least one mechanical switch can be accelerated and, advantageously, a temperature dependence of the at least one mechanical switch can be minimized. Furthermore, a reduced self-heating of the at least one mechanical switch can be achieved and costs can be minimized.
Preferably, the bridging unit has at least two, preferably exactly two, bridging connections and at least one, preferably exactly one, control connection. In this context, a "bridging connection" is to be understood as meaning, in particular, a connection, in particular an input and / or output, of the bridging unit, which is connected to at least one connection of at least one object to be bridged. In particular, the at least two bridging connections are connected to one another in a low-resistance manner, at least in an operating state, in particular a bridging state. Furthermore, the at least two bridging connections are connected to each other in a high-impedance manner, at least in a further operating state, in particular a different operating state, in particular the bypass state, in particular a blocking state. In this context, the term "high-resistance" should be understood as meaning in particular an electrical resistance of at least 500 Ω, advantageously of at least 1 kΩ, preferably of at least 5 kΩ and particularly preferably of at least 10 kΩ. In this context, a "control connection" should be understood to mean, in particular, a connection, in particular an input, of the bridging unit, which is provided, depending on at least one applied signal, in particular an electrical potential and / or a current, a state of the at least one bridging unit in particular, a presence and / or a nonexistence of a low-resistance connection between the at least two bridging terminals to change. In particular, the at least one Control connection free from a, in particular direct, connection to the control unit. Furthermore, the at least one control connection can be embodied identically, in particular, with at least one of the bridging connections. In this way, in particular, a cost-effective and compact bridging unit can be achieved, which in particular can be mounted quickly and easily.

Ist die Überbrückungseinheit stromgesteuert ausgebildet, kann vorteilhaft eine einfache und insbesondere autonome Steuerung der Überbrückungseinheit erreicht werden.If the bridging unit is designed to be current-controlled, a simple and, in particular, autonomous control of the bridging unit can advantageously be achieved.

Ferner wird vorgeschlagen, dass die Überbrückungseinheit im Falle einer zumindest im Wesentlichen verschwindenden Stromstärke durch den zumindest einen Steueranschluss, dazu vorgesehen ist, die Schutzeinheit zumindest teilweise zu überbrücken. Unter einer "zumindest im Wesentlichen verschwindenden Stromstärke" soll dabei insbesondere eine Stromstärke von höchstens 500 mA, insbesondere von maximal 100 mA, vorzugsweise von höchstens 10 mA und besonders vorteilhaft von maximal 1 mA verstanden werden. Hierdurch kann insbesondere eine Steuerung der Überbrückungseinheit weiter vereinfacht werden.It is also proposed that, in the case of an at least substantially vanishing current intensity through the at least one control connection, the bridging unit is intended to at least partially bridge the protective unit. An "at least substantially vanishing current intensity" should be understood to mean in particular a current intensity of at most 500 mA, in particular of at most 100 mA, preferably of at most 10 mA and particularly advantageously of not more than 1 mA. In this way, in particular, a control of the bridging unit can be further simplified.

In einer Ausgestaltung der Erfindung wird vorgeschlagen, dass die Überbrückungseinheit zumindest eine Energiespeichereinheit aufweist, welche in zumindest einem Betriebszustand wenigstens einen, insbesondere zeitlichen, Parameter einer Überbrückung der Schutzeinheit definiert. Dabei soll unter einer "Energiespeichereinheit" insbesondere eine Einheit verstanden werden, welche in zumindest einem Betriebszustand dazu vorgesehen ist, insbesondere elektrische, Energie zu speichern. Die zumindest eine Energiespeichereinheit kann beispielsweise als Batterie, als Akkumulator, als Induktivität und/oder vorteilhaft als Kondensator ausgebildet sein. Hierdurch kann vorteilhaft ein Zustand der Überbrückungseinheit an verschiedene Steuerungsmöglichkeiten angepasst werden.In one embodiment of the invention, it is proposed that the bridging unit has at least one energy storage unit which, in at least one operating state, defines at least one, in particular temporal, parameter of a bridging of the protection unit. In this case, an "energy storage unit" should be understood to mean in particular a unit which is provided in at least one operating state, in particular to store electrical energy. The at least one energy storage unit can be designed, for example, as a battery, as an accumulator, as an inductance and / or advantageously as a capacitor. In this way, advantageously, a state of the bridging unit can be adapted to different control options.

Der wenigstens eine Parameter könnte beispielweise eine Überbrückungsträgheit sein. Unter einer "Überbrückungsträgheit" soll dabei insbesondere eine Zeitdauer zwischen einer Ansteuerung und einem Beginn der Überbrückung verstanden werden. Vorzugsweise ist der wenigstens eine Parameter durch eine Zeitdauer der Überbrückung gegeben. Die Zeitdauer der Überbrückung beträgt insbesondere maximal 500 µs, vorteilhaft maximal 100 µs, vorzugsweise maximal 50 µs und besonders bevorzugt maximal 20 µs. Hierdurch kann insbesondere eine Anpassung der Überbrückungseinheit an verschiedene Steuerungsvarianten vereinfacht werden.The at least one parameter could, for example, be a bridging inertia. A "bridging inertia" is to be understood in particular as meaning a time duration between a control and a start of the bridging. Preferably, the at least one parameter is given by a duration of the bridging. The duration of the bridging is in particular maximum 500 μs, advantageously at most 100 μs, preferably at most 50 μs and particularly preferably at most 20 μs. In this way, in particular an adaptation of the bridging unit to different control variants can be simplified.

Des Weiteren wird vorgeschlagen, dass die Steuereinheit dazu vorgesehen ist, zumindest ein, vorzugsweise genau ein, Steuersignal zur Steuerung eines Schaltzustands des zumindest einen mechanischen Schalters bereitzustellen. Hierdurch kann ein Schaltzustand des zumindest einen mechanischen Schalters vorteilhaft einfach verändert werden.Furthermore, it is proposed that the control unit is provided to provide at least one, preferably exactly one, control signal for controlling a switching state of the at least one mechanical switch. As a result, a switching state of the at least one mechanical switch can advantageously be changed easily.

Ferner wird vorgeschlagen, dass das zumindest eine Steuersignal zumindest teilweise ein pulsweitenmoduliertes Signal ist. Insbesondere kann das pulsweitenmodulierte Signal dabei für verschiedene Zeitbereiche verschiedene Tastgrade aufweisen. Unter einem "Tastgrad" soll insbesondere ein Verhältnis einer Zeitdauer, in der ein, vorzugsweise periodisches, Steuersignal der Steuereinheit einen Einschaltwert, insbesondere einen High-Pegel, annimmt, zu einer Periodendauer des Steuersignals verstanden werden. Hierdurch kann insbesondere eine einfache sowie eine vorteilhaft effiziente Ansteuerung des zumindest einen mechanischen Schalters erreicht werden.It is also proposed that the at least one control signal is at least partially a pulse width modulated signal. In particular, the pulse width modulated signal may have different duty cycles for different time periods. A "duty cycle" is to be understood as meaning in particular a ratio of a time duration in which a, preferably periodic, control signal of the control unit assumes a switch-on value, in particular a high level, to a period duration of the control signal. In this way, in particular a simple and advantageously efficient control of the at least one mechanical switch can be achieved.

Entspricht die Zeitdauer der Überbrückung einer Zeitdauer zumindest eines Low-Pegels des pulsweitenmodulierten Signals, kann insbesondere eine Effizienz gesteigert und ein Abschaltverhalten verbessert werden.Corresponds to the duration of the bridging a period of at least one low level of the pulse width modulated signal, in particular an efficiency can be increased and a turn-off can be improved.

Ferner wird vorgeschlagen, dass die Schutzeinheit zumindest eine Verbrauchereinheit, insbesondere einen Widerstand und/oder vorzugsweise eine Zenerdiode, umfasst. Hierdurch kann insbesondere ein Abschaltvorgang des zumindest einen mechanischen Schalters beschleunigt werden. Ferner kann vorteilhaft eine Temperaturabhängigkeit des zumindest einen mechanischen Schalters minimiert werden.It is further proposed that the protection unit comprises at least one consumer unit, in particular a resistor and / or preferably a Zener diode. In this way, in particular a shutdown of the at least one mechanical switch can be accelerated. Furthermore, advantageously, a temperature dependence of the at least one mechanical switch can be minimized.

Ist die Überbrückungseinheit dazu vorgesehen, die zumindest eine Verbrauchereinheit zu überbrücken, kann ein Abschaltvorgang des zumindest einen mechanischen Schalters vorteilhaft einfach beschleunigt werden.If the bridging unit is provided to bridge the at least one consumer unit, a switch-off process of the at least one mechanical switch can advantageously be accelerated easily.

Weitere Vorteile ergeben sich aus der folgenden Zeichnungsbeschreibung. In der Zeichnung ist ein Ausführungsbeispiel der Erfindung dargestellt. Die Zeichnung, die Beschreibung und die Ansprüche enthalten zahlreiche Merkmale in Kombination.Further advantages emerge from the following description of the drawing. In the drawing, an embodiment of the invention is shown. The drawing, the description and the claims contain numerous features in combination.

Es zeigen:

Fig. 1
ein als Induktionskochfeld ausgebildetes Gargerät mit vier Heizzonen und einer Gargerätevorrichtung in einer Draufsicht,
Fig. 2
ein schematisches Schaltbild der Gargerätevorrichtung mit sechs mechanischen Schaltern,
Fig. 3
ein schematisches Schaltbild eines der mechanischen Schalter und eines Treiberschaltkreises zur Ansteuerung des mechanischen Schalters,
Fig. 4
ein schematisches Schaubild eines Steuersignals zur Steuerung eines Schaltzustands des zumindest einen mechanischen Schalters und
Fig. 5
das schematische Schaltbild aus Figur 3 mit einer beispielhaften Ausgestaltung einer Überbrückungseinheit.
Show it:
Fig. 1
a cooking appliance designed as an induction hob with four heating zones and a cooking appliance device in a plan view,
Fig. 2
a schematic diagram of the cooking appliance device with six mechanical switches,
Fig. 3
a schematic diagram of one of the mechanical switches and a driver circuit for driving the mechanical switch,
Fig. 4
a schematic diagram of a control signal for controlling a switching state of the at least one mechanical switch and
Fig. 5
the schematic diagram FIG. 3 with an exemplary embodiment of a bridging unit.

Figur 1 zeigt ein beispielhaftes als Induktionskochfeld ausgebildetes Gargerät 32 in einer schematischen Draufsicht. Das Gargerät 32 weist im vorliegenden Fall eine Kochfeldplatte mit vier Heizzonen 34 auf. Jede Heizzone 34 ist dazu vorgesehen, genau ein Kochgeschirrelement (nicht dargestellt) zu erhitzen. Darüber hinaus umfasst das Gargerät 32 eine Gargerätevorrichtung. Die Gargerätevorrichtung weist eine Bedieneinheit 36 auf. Die Bedieneinheit 36 dient zur Eingabe und/oder Auswahl einer Leistungsstufe durch einen Benutzer. Zur Steuerung einer Heizleistung umfasst die Gargerätevorrichtung eine Steuereinheit 28. Die Steuereinheit 28 weist eine Recheneinheit, eine Speichereinheit und ein in der Speichereinheit hinterlegtes Betriebsprogramm auf, das dazu vorgesehen ist, von der Recheneinheit ausgeführt zu werden. FIG. 1 shows an exemplary designed as an induction hob cooking device 32 in a schematic plan view. The cooking appliance 32 has a hob plate with four heating zones 34 in the present case. Each heating zone 34 is intended to heat exactly one cookware element (not shown). In addition, the cooking appliance 32 comprises a cooking appliance device. The cooking appliance device has an operating unit 36. The operating unit 36 serves to input and / or select a power level by a user. For controlling a heating power, the cooking device device comprises a control unit 28. The control unit 28 has a computing unit, a memory unit and an operating program stored in the memory unit, which is intended to be executed by the computing unit.

Figur 2 zeigt ein schematisches Schaltbild der Gargerätevorrichtung. Die Gargerätevorrichtung weist vier Induktoren 38, 40, 42, 44 auf. Jeder Induktor 38, 40, 42, 44 ist einer der Heizzonen 34 zugeordnet. Ferner umfasst die Gargerätevorrichtung zwei Wechselrichter 46, 48. Die Wechselrichter 46, 48 sind identisch zueinander ausgebildet. Jeder Wechselrichter 46, 48 weist zwei Halbleiterschalter 50, 52, insbesondere IGBTs, auf. Die Steuereinheit 28 ist mit Steueranschlüssen der Halbleiterschalter 50, 52 verbunden (nicht dargestellt). Jeder der Wechselrichter 46, 48 ist dazu vorgesehen, eine pulsierende gleichgerichtete Netzspannung einer Energiequelle 54 in einen hochfrequenten Heizstrom umzuwandeln und insbesondere zumindest einem der Induktoren 38, 40, 42, 44 zuzuführen. Dazu weist die Gargerätevorrichtung mehrere Leitungspfade 56 auf. Im vorliegenden Fall ist jeder der Wechselrichter 46, 48 mit den Induktoren 38, 40, 42, 44 über Leitungspfade 56 verbunden. Die Gargerätevorrichtung weist ferner zwei Resonanzeinheiten 58 auf. Dabei ist jede der Resonanzeinheiten 58 Bestandteil eines elektrischen Schwingkreises und kann über den zugehörigen Wechselrichter 46, 48 aufgeladen werden. FIG. 2 shows a schematic diagram of the cooking appliance device. The cooking appliance device has four inductors 38, 40, 42, 44. Each inductor 38, 40, 42, 44 is associated with one of the heating zones 34. Furthermore, the cooking appliance device comprises two Inverters 46, 48. The inverters 46, 48 are formed identical to each other. Each inverter 46, 48 has two semiconductor switches 50, 52, in particular IGBTs. The control unit 28 is connected to control terminals of the semiconductor switches 50, 52 (not shown). Each of the inverters 46, 48 is intended to convert a pulsed rectified mains voltage of a power source 54 into a high frequency heating current and in particular to supply at least one of the inductors 38, 40, 42, 44. For this purpose, the cooking appliance device has a plurality of line paths 56. In the present case, each of the inverters 46, 48 is connected to the inductors 38, 40, 42, 44 via conductive paths 56. The cooking appliance device further comprises two resonance units 58. Each of the resonance units 58 is part of an electrical resonant circuit and can be charged via the associated inverter 46, 48.

Ferner weist die Gargerätevorrichtung eine Schaltanordnung 60 auf. Die Schaltanordnung 60 umfasst mehrere mechanische Schalter 10, 12. Die mechanischen Schalter 10, 12 sind dazu vorgesehen, die Leitungspfade 56 zwischen den Wechselrichtern 46, 48 und den Induktoren 38, 40, 42, 44 zu unterbrechen und/oder herzustellen. Im vorliegenden Fall umfasst die Schaltanordnung 60 sechs mechanische Schalter 10, 12. Die mechanischen Schalter 10, 12 sind baugleich. Die mechanischen Schalter 10, 12 sind als Wechselschalter ausgebildet. Die mechanischen Schalter 10 , 12 sind im vorliegenden Fall als Relais ausgebildet. Jeder der Leitungspfade 56 ist durch zwei mechanische Schalter 10, 12 unterbrechbar. Zwei erste mechanische Schalter 10 sind jeweils mit einem Heizstromausgang 62, 64 der Wechselrichter 46, 48 verbunden. Ferner sind die zwei ersten mechanischen Schalter 10 jeweils mit zwei zweiten mechanischen Schaltern 12 verbunden. Die beiden zweiten mechanischen Schalter 12 sind jeweils mit einem der Induktoren 38, 40, 42, 44 verbunden.Furthermore, the cooking appliance device has a switching arrangement 60. The switch assembly 60 includes a plurality of mechanical switches 10, 12. The mechanical switches 10, 12 are designed to interrupt and / or establish the conductive paths 56 between the inverters 46, 48 and the inductors 38, 40, 42, 44. In the present case, the switching arrangement 60 comprises six mechanical switches 10, 12. The mechanical switches 10, 12 are identical. The mechanical switches 10, 12 are designed as a changeover switch. The mechanical switches 10, 12 are formed in the present case as a relay. Each of the conductive paths 56 is interruptible by two mechanical switches 10, 12. Two first mechanical switches 10 are each connected to a heating current output 62, 64 of the inverters 46, 48. Furthermore, the two first mechanical switches 10 are each connected to two second mechanical switches 12. The two second mechanical switches 12 are each connected to one of the inductors 38, 40, 42, 44.

Des Weiteren weist die Gargerätevorrichtung mehrere Treiberschaltkreise 14 auf. Jeder Treiberschaltkreis 14 ist zu einer Ansteuerung eines der mechanischen Schalter 10, 12 vorgesehen. Die Treiberschaltkreise 14 sind im vorliegenden Fall zueinander identisch ausgebildet. Jedem der mechanischen Schalter 10, 12 ist einer der Treiberschaltkreise 14 zugeordnet. Jeder der mechanischen Schalter 10, 12 ist mit einem der Treiberschaltkreise 14 verbunden. Alternativ ist auch denkbar zumindest einen Treiberschaltkreis unterschiedlich auszubilden. Ferner könnte zumindest zwei mechanischen Schaltern ein einziger Treiberschaltkreis zugeordnet sein.Furthermore, the cooking appliance device has a plurality of driver circuits 14. Each driver circuit 14 is provided for driving one of the mechanical switches 10, 12. The driver circuits 14 are formed identical to one another in the present case. Each of the mechanical switches 10, 12 is associated with one of the driver circuits 14. Each of the mechanical switches 10, 12 is connected to one of the driver circuits 14. Alternatively, it is also conceivable at least one Driver circuit form differently. Furthermore, at least two mechanical switches could be assigned a single driver circuit.

Ferner kann die Gargerätevorrichtung weitere Einheiten umfassen, wie insbesondere Gleichrichter, Filter, Detektoren, insbesondere Stromdetektoren und/oder Spannungsdetektoren, und/oder Spannungswandler.Furthermore, the cooking appliance device may comprise further units, in particular rectifiers, filters, detectors, in particular current detectors and / or voltage detectors, and / or voltage transformers.

Figur 3 zeigt ein beispielhaftes, schematisches Schaltbild eines der mechanischen Schalter 10, 12 und eines der Treiberschaltkreise 14 aus Figur 2. Die folgende Beschreibung ist dabei beispielhaft für einen der mechanischen Schalter 10, 12 und kann insbesondere auf die anderen mechanischen Schalter 10, 12 übertragen werden. FIG. 3 FIG. 12 shows an exemplary schematic circuit diagram of one of the mechanical switches 10, 12 and one of the driver circuits 14 FIG. 2 , The following description is exemplary of one of the mechanical switches 10, 12 and can in particular be transferred to the other mechanical switches 10, 12.

Der mechanische Schalter 10, 12 weist ein Ankerelement 70 auf. Das Ankerelement 70 ist aus einem ferromagnetischen Material hergestellt. Ferner weist der mechanische Schalter 10, 12 eine Treiberspule 72 auf. Im vorliegenden Fall weist die Treiberspule 72 einen ferromagnetischen Kern auf. Alternativ kann eine Treiberspule auch ohne ferromagnetischen Kern ausgebildet sein und/oder einen Kern aus einem anderen Material aufweisen. Die Treiberspule 72 ist in zumindest einem Betriebszustand dazu vorgesehen, das Ankerelement 70 anzuziehen, insbesondere durch eine magnetische Kraft. Der mechanische Schalter 10, 12 weist drei Kontakte auf. Ein erster Kontakt ist als Schaltkontakt 74 ausgebildet. Der Schaltkontakt 74 ist mittelbar und/oder unmittelbar mit einem der zwei Heizstromausgänge 62, 64 verbunden. Ein zweiter Kontakt ist als Ruhekontakt 76 ausgebildet. Der Ruhekontakt 76 ist mittelbar und/oder unmittelbar mit einem der Induktoren 38, 40, 42, 44 verbunden. Ein dritter Kontakt ist als Arbeitskontakt 78 ausgebildet. Der Arbeitskontakt 78 ist mittelbar und/oder unmittelbar mit einem der Induktoren 38, 40, 42, 44 verbunden.The mechanical switch 10, 12 has an anchor element 70. The anchor element 70 is made of a ferromagnetic material. Furthermore, the mechanical switch 10, 12 has a driver coil 72. In the present case, the driver coil 72 has a ferromagnetic core. Alternatively, a driver coil may also be formed without a ferromagnetic core and / or have a core of a different material. The drive coil 72 is provided in at least one operating state to attract the anchor member 70, in particular by a magnetic force. The mechanical switch 10, 12 has three contacts. A first contact is designed as a switching contact 74. The switching contact 74 is indirectly and / or directly connected to one of the two Heizstromausgänge 62, 64. A second contact is designed as a normally closed contact 76. The normally closed contact 76 is indirectly and / or directly connected to one of the inductors 38, 40, 42, 44. A third contact is designed as a normally open contact 78. The normally open contact 78 is indirectly and / or directly connected to one of the inductors 38, 40, 42, 44.

Der Treiberschaltkreis 14 umfasst eine Treibereinheit 66. Die Treibereinheit 66 dient zur Ansteuerung des Treiberschaltkreises 14. Die Treibereinheit 66 ist dazu vorgesehen, eine Funktion des Treiberschaltkreises 14 zu steuern. Die Treibereinheit 66 weist drei Anschlüsse auf. Ferner weist der Treiberschaltkreis 14 eine Schutzeinheit 16 auf. Die Schutzeinheit 16 ist dazu vorgesehen, den mechanischen Schalter 10, 12 vor einer Überspannung zu schützen. Des Weiteren ist die Schutzeinheit 16 dazu vorgesehen, die Treibereinheit 66 vor einer Überspannung zu schützen. Die Schutzeinheit 16 weist drei Anschlüsse auf. Der Treiberschaltkreis 14 weist ferner eine Überbrückungseinheit 18 auf. Die Überbrückungseinheit 18 weist drei Anschlüsse 20, 22, 24 auf. Im vorliegenden Fall weist die Überbrückungseinheit 18 zwei Überbrückungsanschlüsse 20, 22 und einen Steueranschluss 24 auf. Des Weiteren weist die Gargerätevorrichtung eine Versorgungseinheit (nicht dargestellt) auf. Die Versorgungseinheit ist dazu vorgesehen, eine Versorgungsspannung für den Treiberschaltkreis 14 bereitzustellen. Dazu ist ein Versorgungsanschluss 68 mit dem Treiberschaltkreis 14 verbunden. Ferner ist der mechanische Schalter 10, 12 mit dem Treiberschaltkreis 14 verbunden. Dazu weist der mechanische Schalter 10, 12 zwei Anschlüsse auf.The driver circuit 14 comprises a driver unit 66. The driver unit 66 is used to drive the driver circuit 14. The driver unit 66 is provided to control a function of the driver circuit 14. The driver unit 66 has three terminals. Furthermore, the driver circuit 14 has a protection unit 16. The protection unit 16 is intended to protect the mechanical switch 10, 12 from overvoltage. Furthermore, the protection unit 16 is provided to protect the driver unit 66 from overvoltage. The protection unit 16 has three Connections on. The driver circuit 14 further includes a bypass unit 18. The bridging unit 18 has three terminals 20, 22, 24. In the present case, the bridging unit 18 has two bridging connections 20, 22 and a control connection 24. Furthermore, the cooking appliance device has a supply unit (not shown). The supply unit is provided to provide a supply voltage for the driver circuit 14. For this purpose, a supply connection 68 is connected to the driver circuit 14. Further, the mechanical switch 10, 12 is connected to the driver circuit 14. For this purpose, the mechanical switch 10, 12 has two connections.

Der Versorgungsanschluss 68 ist mit einem ersten Anschluss der Treiberspule 72 verbunden. Der Versorgungsanschluss 68 ist mit einem ersten Anschluss der Schutzeinheit 16 verbunden. Ferner ist der Versorgungsanschluss 68 mit dem Steueranschluss 24 der Überbrückungseinheit 18 verbunden.The supply terminal 68 is connected to a first terminal of the drive coil 72. The supply terminal 68 is connected to a first terminal of the protection unit 16. Furthermore, the supply connection 68 is connected to the control connection 24 of the bridging unit 18.

Der erste Anschluss der Treiberspule 72 ist mit einem ersten Anschluss der Schutzeinheit 16 verbunden. Ferner ist der erste Anschluss der Treiberspule 72 mit dem Steueranschluss 24 der Überbrückungseinheit 18 verbunden. Ein zweiter Anschluss der Treiberspule 72 ist mit einem ersten Anschluss der Treibereinheit 66 verbunden. Der zweite Anschluss der Treiberspule 72 ist mit einem dritten Anschluss der Schutzeinheit 16 verbunden. Ferner ist der zweite Anschluss der Treiberspule 72 mit dem zweiten Überbrückungsanschluss 22 der Überbrückungseinheit 18 verbunden.The first terminal of the driver coil 72 is connected to a first terminal of the protection unit 16. Furthermore, the first terminal of the driver coil 72 is connected to the control terminal 24 of the bridging unit 18. A second terminal of the driver coil 72 is connected to a first terminal of the driver unit 66. The second terminal of the driver coil 72 is connected to a third terminal of the protection unit 16. Furthermore, the second terminal of the driver coil 72 is connected to the second bridging terminal 22 of the bridging unit 18.

Der erste Anschluss der Schutzeinheit 16 ist mit dem Steueranschluss 24 der Überbrückungseinheit 18 verbunden. Ein zweiter Anschluss der Schutzeinheit 16 ist mit dem ersten Überbrückungsanschluss 20 der Überbrückungseinheit 18 verbunden. Der dritte Anschluss der Schutzeinheit 16 ist mit dem zweiten Überbrückungsanschluss 22 der Überbrückungseinheit 18 verbunden. Ferner ist der dritte Anschluss der Schutzeinheit 16 mit dem ersten Anschluss der Treibereinheit 66 verbunden.The first terminal of the protection unit 16 is connected to the control terminal 24 of the bridging unit 18. A second terminal of the protection unit 16 is connected to the first bridging terminal 20 of the bridging unit 18. The third terminal of the protection unit 16 is connected to the second bridging terminal 22 of the bridging unit 18. Furthermore, the third terminal of the protection unit 16 is connected to the first terminal of the driver unit 66.

Der zweite Überbrückungsanschluss 22 der Überbrückungseinheit 18 ist ferner mit dem ersten Anschluss der Treibereinheit 66 verbunden. Ein zweiter Anschluss der Treibereinheit 66 ist mit der Steuereinheit 28 verbunden. Des Weiteren ist ein dritter Anschluss der Treibereinheit 66 mit einem Massenschluss verbunden. Alternativ oder zusätzlich kann ein dritter Anschluss einer Treibereinheit auch geerdet sein.The second bridging terminal 22 of the bridging unit 18 is further connected to the first terminal of the driver unit 66. A second terminal of the driver unit 66 is connected to the control unit 28. Furthermore, a third one Connection of the driver unit 66 connected to a ground fault. Alternatively or additionally, a third terminal of a driver unit may also be grounded.

Die Treibereinheit 66 weist zumindest einen Steuerungsschalter 80 auf. Der Steuerungsschalter 80 ist im vorliegenden Fall als Bipolartransistor ausgebildet. Der Steuerungsschalter 80 ist mit einem Basiskontakt über einen Widerstand mit dem zweiten Anschluss der Treibereinheit 66 verbunden. Ferner ist der Steuerungsschalter 80 mit einem Emitterkontakt mit dem Masseanschluss verbunden. Der Steuerungsschalter 80 ist mit einem Kollektorkontakt mit dem ersten Anschluss der Treibereinheit 66 verbunden. Ferner kann die Treibereinheit 66 zumindest ein weiteres Bauteil, wie insbesondere zumindest einen elektrischen Widerstand und/oder zumindest einen Kondensator, aufweisen.The driver unit 66 has at least one control switch 80. The control switch 80 is formed in the present case as a bipolar transistor. The control switch 80 is connected to a base contact via a resistor to the second terminal of the driver unit 66. Further, the control switch 80 is connected to the ground terminal with an emitter contact. The control switch 80 is connected to a collector contact with the first terminal of the driver unit 66. Furthermore, the driver unit 66 may have at least one further component, in particular at least one electrical resistance and / or at least one capacitor.

Die Schutzeinheit 16 weist eine Freilaufdiode 82 auf. Ferner weist die Schutzeinheit 16 eine Verbrauchereinheit 30 auf. Die Verbrauchereinheit 30 ist im vorliegenden Fall als Zenerdiode ausgebildet. Die Freilaufdiode 82 ist mit einem Kathodenkontakt mit dem ersten Anschluss der Schutzeinheit 16 verbunden. Die Freilaufdiode 82 ist mit einem Anodenkontakt mit dem zweiten Anschluss der Schutzeinheit 16 verbunden. Die Verbrauchereinheit 30 ist mit einem ersten Kontakt, insbesondere einem Kathodenkontakt, mit dem dritten Anschluss der Schutzeinheit 16 verbunden. Die Verbrauchereinheit 30 ist mit einem zweiten Kontakt, insbesondere einem Anodenkontakt, mit dem zweiten Anschluss der Schutzeinheit 16 verbunden. Ferner ist die Verbrauchereinheit 30 mit dem zweiten Kontakt, insbesondere dem Anodenkontakt, mit dem Anodenkontakt der Freilaufdiode 82 verbunden.The protection unit 16 has a freewheeling diode 82. Furthermore, the protection unit 16 has a load unit 30. The consumer unit 30 is formed in the present case as a Zener diode. The freewheeling diode 82 is connected to a cathode contact with the first terminal of the protection unit 16. The freewheeling diode 82 is connected to the second terminal of the protection unit 16 with an anode contact. The consumer unit 30 is connected to the third terminal of the protection unit 16 with a first contact, in particular a cathode contact. The consumer unit 30 is connected to the second terminal of the protection unit 16 with a second contact, in particular an anode contact. Furthermore, the consumer unit 30 is connected to the second contact, in particular the anode contact, with the anode contact of the freewheeling diode 82.

Die Überbrückungseinheit 18 weist im vorliegenden Fall zumindest einen Überbrückungsschalter 84 auf. Ferner weist die Überbrückungseinheit 18 eine Energiespeichereinheit 26 auf. Die Energiespeichereinheit 26 ist im vorliegenden Fall als Kondensator ausgebildet. Die Energiespeichereinheit 26 steht dabei mit dem Überbrückungsschalter 84 in Wirkverbindung. Ferner kann die Überbrückungseinheit 18 zumindest ein weiteres Bauteil, wie insbesondere zumindest einen elektrischen Widerstand und/oder zumindest einen Kondensator, aufweisen.The bridging unit 18 has at least one bridging switch 84 in the present case. Furthermore, the bridging unit 18 has an energy storage unit 26. The energy storage unit 26 is formed in the present case as a capacitor. The energy storage unit 26 is in operative connection with the bridging switch 84. Furthermore, the bridging unit 18 can have at least one further component, in particular at least one electrical resistance and / or at least one capacitor.

Die Überbrückungseinheit 18 ist dazu vorgesehen, die Schutzeinheit 16 in zumindest einem Betriebszustand zumindest teilweise zu überbrücken. Dazu ist die Überbrückungseinheit 18 selbststeuernd ausgebildet. Demnach ist die Überbrückungseinheit 18 frei von direkten Verbindungen zu der Steuereinheit 28. Ferner ist die Überbrückungseinheit 18 dazu vorgesehen, die Verbrauchereinheit 30 in dem zumindest einen Betriebszustand zu überbrücken. Im vorliegenden Fall ist der Überbrückungsschalter 84 dazu vorgesehen, die Verbrauchereinheit 30 in dem zumindest einen Betriebszustand zu überbrücken.The bridging unit 18 is intended to at least partially bridge the protection unit 16 in at least one operating state. For this purpose, the bridging unit 18 is designed to be self-controlling. Accordingly, the bridging unit 18 is free of direct connections to the control unit 28. Furthermore, the bridging unit 18 is provided to bridge the load unit 30 in the at least one operating state. In the present case, the bypass switch 84 is provided to bypass the load unit 30 in the at least one operating state.

Dazu ist die Überbrückungseinheit 18 stromgesteuert ausgebildet. Dabei kann ein Überbrückungszustand der Überbrückungseinheit 18 abhängig von einem Strom, welcher durch den Steueranschluss 24 der Überbrückungseinheit 18 fließt, verändert werden.For this purpose, the bridging unit 18 is designed to be current-controlled. In this case, a bridging state of the bridging unit 18 may be changed depending on a current flowing through the control terminal 24 of the bridging unit 18.

Ferner ist die Steuereinheit 28 dazu vorgesehen, ein Steuersignal zur Steuerung eines Schaltzustands des mechanischen Schalters 10, 12 bereitzustellen. Das Steuersignal der Steuereinheit 28 liegt dabei an dem zweiten Anschluss der Treibereinheit 66 an.Furthermore, the control unit 28 is provided to provide a control signal for controlling a switching state of the mechanical switch 10, 12. The control signal of the control unit 28 is applied to the second terminal of the driver unit 66.

Figur 4 zeigt ein schematisches Schaubild des Steuersignals zur Steuerung eines Schaltzustands des mechanischen Schalters 10, 12 sowie damit verbundene Schaltvorgänge des mechanischen Schalters 10, 12. Auf einer Abszissenachse 86 ist die Zeit dargestellt. Eine Ordinatenachse 88 ist als Größenachse dargestellt. Eine Kurve 90 zeigt das von der Steuereinheit 28 bereitgestellte Steuersignal. Das Steuersignal ist im vorliegenden Fall zumindest teilweise durch ein pulsweitenmoduliertes Signal gegeben. Demnach kann das Steuersignal zumindest einen High-Pegel und zumindest einen Low-Pegel annehmen. Eine Kurve 92 veranschaulicht die Schaltvorgänge. Ein "1"-Pegel definiert dabei eine leitende Verbindung zwischen dem Schaltkontakt 74 und dem Ruhekontakt 76 des mechanischen Schalters 10, 12. Ein "-1"-Pegel definiert eine leitende Verbindung zwischen dem Schaltkontakt 74 und dem Arbeitskontakt 78 des mechanischen Schalters 10, 12. Ein "0"-Pegel definiert einen nicht-leitenden Zustand. FIG. 4 shows a schematic diagram of the control signal for controlling a switching state of the mechanical switch 10, 12 and associated switching operations of the mechanical switch 10, 12. On an abscissa axis 86, the time is shown. An ordinate axis 88 is shown as a size axis. A curve 90 shows the control signal provided by the control unit 28. The control signal is given in the present case, at least partially by a pulse width modulated signal. Accordingly, the control signal can assume at least a high level and at least a low level. A curve 92 illustrates the switching operations. A "1" level defines a conductive connection between the switch contact 74 and the normally closed contact 76 of the mechanical switch 10, 12. A "-1" level defines a conductive connection between the switch contact 74 and the make contact 78 of the mechanical switch 10, 12. A "0" level defines a non-conductive state.

Während eines ersten Zeitintervalls t1 weist das Steuersignal den Low-Pegel auf. In diesem Ruhezustand ist der Steuerungsschalter 80 geöffnet und demnach nicht-leitend. Dabei fließt kein Strom in den Steueranschluss 24 der Überbrückungseinheit 18. In diesem Fall sind die Überbrückungsanschlüsse 20, 22 hochohmig verbunden. Insbesondere ist der Überbrückungsschalter 84 nicht-leitend. Ferner ist die Treiberspule 72 stromfrei. Des Weiteren ist der Schaltkontakt 74 des mechanischen Schalters 10, 12 mit dem Ruhekontakt 76 leitend verbunden.During a first time interval t 1 , the control signal has the low level. In this idle state, the control switch 80 is open and therefore non-conductive. In this case, no current flows into the control connection 24 of the bridging unit 18 In this case, the bridging terminals 20, 22 are connected with high resistance. In particular, the bypass switch 84 is non-conductive. Furthermore, the drive coil 72 is current-free. Furthermore, the switching contact 74 of the mechanical switch 10, 12 is conductively connected to the normally closed contact 76.

Zu einem Zeitpunkt T1 ändert sich das Steuersignal. Während eines zweiten Zeitintervalls t2 weist das Steuersignal den High-Pegel auf. In diesem Einschaltzustand ist der Steuerungsschalter 80 geschlossen und demnach leitend. Dabei fließt ein Teilstrom in den Steueranschluss 24 der Überbrückungseinheit 18. In diesem Fall sind die Überbrückungsanschlüsse 20, 22 niederohmig verbunden. Insbesondere ist der Überbrückungsschalter 84 leitend. Demnach kann der Teilstrom durch den Überbrückungsschalter 84 und den Steuerungsschalter 80 zu dem Masseanschluss fließen. Ferner kann der Teilstrom im vorliegenden Fall durch die, insbesondere in Durchlassrichtung geschaltete, Verbrauchereinheit 30 und den Steuerungsschalter 80 zu dem Masseanschluss fließen. Dabei ist der Teilstrom, welcher durch die Überbrückungseinheit 18 fließt, ferner dazu vorgesehen, die Energiespeichereinheit 26 zu laden. Ferner fließt ein Schaltstrom durch die Treiberspule 72. Der Schaltstrom fließt durch die Treiberspule 72 und den Steuerungsschalter 80 zu dem Masseanschluss. In diesem Fall fließt ein maximaler mittlerer Strom durch die Treiberspule 72. Dadurch findet ein erster Schaltvorgang statt. Das Ankerelement 70 wechselt dabei seine Position, so dass der Schaltkontakt 74 mit dem Arbeitskontakt 78 leitend verbunden ist. Das zweite Zeitintervall t2 weist im vorliegenden Fall eine Zeitdauer von 100 ms auf. Der Schaltvorgang beginnt zu einem Zeitpunkt TS1. Der Schaltvorgang endet zu einem Zeitpunkt TS2. Zu dem Zeitpunkt TS2 ist ein Prellen des mechanischen Schalters 10, 12 vollständig abgeschlossen. Ein Schaltvorgang weist im vorliegenden Fall eine Zeitdauer von 10 ms auf. Vorzugsweise ist die Steuereinheit 28 dazu vorgesehen, die Wechselrichter 46, 48 zumindest während des Schaltvorgangs zu deaktivieren.At a time T 1 , the control signal changes. During a second time interval t 2 , the control signal has the high level. In this on state, the control switch 80 is closed and therefore conductive. In this case, a partial current flows into the control terminal 24 of the bridging unit 18. In this case, the bridging terminals 20, 22 are connected to low resistance. In particular, the bypass switch 84 is conductive. Thus, the split current may flow through the bypass switch 84 and the control switch 80 to the ground terminal. Furthermore, in the present case, the partial flow can flow to the ground connection through the consumer unit 30, which is connected in particular in the forward direction, and the control switch 80. In this case, the partial flow which flows through the bridging unit 18 is further provided to charge the energy storage unit 26. Further, a switching current flows through the driving coil 72. The switching current flows through the driving coil 72 and the control switch 80 to the ground terminal. In this case, a maximum average current flows through the driver coil 72. As a result, a first switching operation takes place. The anchor member 70 changes its position, so that the switching contact 74 is conductively connected to the normally open contact 78. The second time interval t 2 has a time duration of 100 ms in the present case. The switching process begins at a time T S1 . The switching process ends at a time T S2. At the time T S2 bouncing of the mechanical switch 10, 12 is completely completed. A switching operation in the present case has a duration of 10 ms. Preferably, the control unit 28 is provided to deactivate the inverters 46, 48 at least during the switching operation.

Zu einem Zeitpunkt T2 ändert sich das Steuersignal. Ab dem Zeitpunkt T2 ist das Steuersignal durch ein pulsweitenmoduliertes Signal gegeben. Ein Tastgrad des Steuersignals weist dabei einen Wert von 0,7 auf. Während eines gesamten dritten Zeitintervalls t3 weist das Steuersignal den Tastgrad mit dem Wert 0,7 auf. Ferner weist das Steuersignal eine Frequenz von 25 kHz auf. In diesem Haltezustand bewirkt das Steuersignal, dass der Steuerungsschalter 80 abwechselnd geschlossen und geöffnet ist. Bei einem High-Pegel des Steuersignals findet ein zu dem Einschaltzustand analoger Betrieb statt. Bei einem Low-Pegel des Steuersignals ist der Steuerungsschalter 80 geöffnet und demnach nicht-leitend. Dabei fließt kein Strom in den Steueranschluss 24 der Überbrückungseinheit 18. Die Überbrückungseinheit 18 ist in diesem Fall, insbesondere einem Fall einer verschwindenden Stromstärke durch den Steueranschluss 24, dazu vorgesehen, die Schutzeinheit 16 zumindest teilweise zu überbrücken. Im vorliegenden Fall ist die Überbrückungseinheit 18 dazu vorgesehen, die Verbrauchereinheit 30 zu überbrücken. Dabei sorgt eine Ladung der Energiespeichereinheit 26 dafür, dass der Überbrückungsschalter 84 leitend ist. Dadurch sind die Überbrückungsanschlüsse 20, 22 niederohmig verbunden. In diesem Betriebszustand ist die Energiespeichereinheit 26 dazu vorgesehen, einen Parameter einer Überbrückung der Schutzeinheit 16 zu definieren. Der Parameter ist durch eine Zeitdauer der Überbrückung gegeben. Die Zeitdauer der Überbrückung entspricht der maximalen Zeitdauer, in welcher die Überbrückungsanschlüsse 20, 22, bei verschwindender Stromstärke an dem Steueranschluss 24, niederohmig verbunden sind. Die Zeitdauer der Überbrückung entspricht im vorliegenden Fall gerade einer Zeitdauer des Low-Pegels des pulsweitenmodulierten Signals. Die Zeitdauer der Überbrückung entspricht im vorliegenden Fall 12 µs. Durch das plötzliche Abschalten des Stroms tritt durch die Treiberspule 72 eine hohe Induktionsspannung auf. Die Schutzeinheit 16 und/oder die Überbrückungseinheit 18 sind dazu vorgesehen, diese Induktionsspannung abzubauen. Ein durch die Induktionsspannung hervorgerufener Kreisstrom fließt durch die Überbrückungseinheit 18, die Freilaufdiode 82 und die Treiberspule 72. In diesem Fall fließt der Kreisstrom durch den Überbrückungsschalter 84, die Freilaufdiode 82 und die Treiberspule 72.At a time T 2 , the control signal changes. From the time T 2 , the control signal is given by a pulse width modulated signal. A duty cycle of the control signal has a value of 0.7. During an entire third time interval t 3 , the control signal has the duty cycle with the value 0.7. Furthermore, the control signal has a frequency of 25 kHz. In this hold state, the control signal causes the control switch 80 to be alternately closed and opened is. At a high level of the control signal, an operation analogous to the on state takes place. At a low level of the control signal, the control switch 80 is opened and therefore non-conductive. In this case, no current flows into the control terminal 24 of the bridging unit 18. The bridging unit 18 is provided in this case, in particular a case of a vanishing current through the control terminal 24, to at least partially bridge the protection unit 16. In the present case, the bridging unit 18 is provided to bridge the consumer unit 30. In this case, a charge of the energy storage unit 26 ensures that the bypass switch 84 is conductive. As a result, the bridging terminals 20, 22 are connected to low resistance. In this operating state, the energy storage unit 26 is provided to define a parameter of a bypass of the protection unit 16. The parameter is given by a period of bridging. The duration of the bridging corresponds to the maximum time duration in which the bridging terminals 20, 22 are connected to low impedance at vanishing current intensity at the control terminal 24. The duration of the bridging corresponds in the present case just a time duration of the low level of the pulse width modulated signal. The bridging time corresponds to 12 μs in the present case. Due to the sudden switching off of the current, a high induction voltage occurs through the driver coil 72. The protection unit 16 and / or the bridging unit 18 are intended to reduce this induction voltage. A loop current caused by the induction voltage flows through the bypass unit 18, the flywheel diode 82, and the drive coil 72. In this case, the circulating current flows through the bypass switch 84, the flywheel diode 82, and the drive coil 72.

Während des gesamten dritten Zeitintervalls t3 fließt ein mittlerer Strom durch die Treiberspule 72. Der mittlere Strom entspricht dabei einem, insbesondere minimal, benötigten Haltestrom. Hierdurch kann das Ankerelement 70 an dem Arbeitskontakt 78 gehalten werden. Dabei ist der Schaltkontakt 74 mit dem Arbeitskontakt 78 leitend verbunden. Hierdurch kann eine Effizienz gesteigert und eine Selbsterwärmung des mechanischen Schalters 10, 12 verringert werden.During the entire third time interval t 3 , a mean current flows through the driver coil 72. The average current corresponds to a, in particular minimal, required holding current. As a result, the anchor element 70 can be held on the working contact 78. In this case, the switching contact 74 is conductively connected to the normally open contact 78. This can increase efficiency and self-heating of the mechanical switch 10, 12 can be reduced.

Zu einem Zeitpunkt T3 ändert sich das Steuersignal. Während eines vierten Zeitintervalls t4 weist das Steuersignal den Low-Pegel auf. In diesem Ausschaltzustand ist der Steuerungsschalter 80 geöffnet und demnach nicht-leitend. Zunächst findet dabei ein zu dem Low-Pegel des Haltezustands analoger Betrieb statt. Ist die Energiespeichereinheit 26 der Überbrückungseinheit 18 zumindest im Wesentlichen entladen, wechselt der Überbrückungsschalter 84 in einen nicht-leitenden Zustand. In diesem Fall sind die Überbrückungsanschlüsse 20, 22 hochohmig verbunden. Somit ist der Überbrückungsschalter 84 nicht-leitend. Ferner ist die Schutzeinheit 16 dazu vorgesehen, die entstehende Induktionsspannung abzubauen. Ein durch die Induktionsspannung hervorgerufener Kreisstrom fließt durch die Verbrauchereinheit 30, die Freilaufdiode 82 und die Treiberspule 72. Hierdurch kann eine Energie in der Treiberspule 72 effektiv und insbesondere schnell abgebaut werden, so dass eine thermische Abhängigkeit des mechanischen Schalters 10, 12 reduziert werden kann. Die Energie der Treiberspule 72 ist nach etwa 1,5 ms bis 2 ms abgebaut. Ferner findet ein zweiter Schaltvorgang statt. Das Ankerelement 70 wechselt seine Position, so dass der Schaltkontakt 74 mit dem Ruhekontakt 76 leitend verbunden ist. Der Schaltvorgang beginnt zu einem Zeitpunkt TS3. Der Schaltvorgang endet zu einem Zeitpunkt TS4. Zu dem Zeitpunkt TS4 ist ein Prellen des mechanischen Schalters 10, 12 vollständig abgeschlossen. An das vierte Zeitintervall t4 schließt das erste Zeitintervall t1 an.At a time T 3 , the control signal changes. During a fourth time interval t 4 , the control signal has the low level. In this off state is the Control switch 80 is opened and therefore non-conductive. Initially, an analog operation takes place relative to the low level of the hold state. When the energy storage unit 26 of the bypass unit 18 is at least substantially discharged, the bypass switch 84 changes to a non-conductive state. In this case, the bridging terminals 20, 22 are connected with high resistance. Thus, the bypass switch 84 is non-conductive. Furthermore, the protection unit 16 is intended to reduce the resulting induction voltage. A circulating current caused by the induction voltage flows through the load unit 30, the freewheeling diode 82 and the drive coil 72. In this way, energy in the drive coil 72 can be effectively and in particular rapidly degraded, so that a thermal dependency of the mechanical switch 10, 12 can be reduced. The energy of the drive coil 72 is degraded after about 1.5 ms to 2 ms. Furthermore, a second switching operation takes place. The armature element 70 changes its position, so that the switching contact 74 is conductively connected to the normally closed contact 76. The switching process begins at a time T S3 . The switching process ends at a time T S4 . At the time T S4 bouncing of the mechanical switch 10, 12 is completely completed. The fourth time interval t 4 is followed by the first time interval t 1 .

Figur 5 zeigt das schematische Schaltbild aus Figur 3 mit einer beispielhaften Ausgestaltung der Überbrückungseinheit 18. Im Folgenden soll dabei lediglich die Ausgestaltung der Überbrückungseinheit 18 beschrieben werden. FIG. 5 shows the schematic diagram FIG. 3 with an exemplary embodiment of the bridging unit 18. In the following, only the design of the bridging unit 18 will be described.

Der Überbrückungsschalter 84 ist im vorliegenden Fall als Bipolartransistor ausgebildet. Die als Kondensator ausgebildete Energiespeichereinheit 26 weist im vorliegenden Fall eine Kapazität von etwa 200 nF auf.The bypass switch 84 is formed in the present case as a bipolar transistor. The designed as a capacitor energy storage unit 26 has in the present case has a capacity of about 200 nF.

Der Steueranschluss 24 der Überbrückungseinheit 18 ist mit einem ersten Kontakt eines ersten Widerstands 94 der Überbrückungseinheit 18 verbunden. Ein zweiter Kontakt des ersten Widerstands 94 ist mit einem Basiskontakt des Überbrückungsschalters 84 verbunden. Der zweite Kontakt des ersten Widerstands 94 ist mit einem ersten Kontakt der Energiespeichereinheit 26 verbunden. Ferner ist der zweite Kontakt des ersten Widerstands 94 mit einem ersten Kontakt eines zweiten Widerstands 96 der Überbrückungseinheit 18 verbunden.The control terminal 24 of the bridging unit 18 is connected to a first contact of a first resistor 94 of the bridging unit 18. A second contact of the first resistor 94 is connected to a base contact of the bypass switch 84. The second contact of the first resistor 94 is connected to a first contact of the energy storage unit 26. Furthermore, the second contact of the first resistor 94 is connected to a first contact of a second resistor 96 of the bridging unit 18.

Der erste Kontakt der Energiespeichereinheit 26 ist mit dem ersten Kontakt des zweiten Widerstands 96 verbunden. Der erste Kontakt der Energiespeichereinheit 26 ist mit dem Basiskontakt des Überbrückungsschalters 84 verbunden. Der erste Kontakt des zweiten Widerstands 96 ist mit dem Basiskontakt des Überbrückungsschalters 84 verbunden. Ein zweiter Kontakt der Energiespeichereinheit 26 ist mit einem zweiten Kontakt des zweiten Widerstands 96 verbunden. Der zweite Kontakt der Energiespeichereinheit 26 ist ferner mit dem ersten Überbrückungsanschluss 20 verbunden. Der zweite Kontakt der Energiespeichereinheit 26 ist mit einem Emitterkontakt des Überbrückungsschalters 84 verbunden.The first contact of the energy storage unit 26 is connected to the first contact of the second resistor 96. The first contact of the energy storage unit 26 is connected to the base contact of the bypass switch 84. The first contact of the second resistor 96 is connected to the base contact of the bypass switch 84. A second contact of the energy storage unit 26 is connected to a second contact of the second resistor 96. The second contact of the energy storage unit 26 is further connected to the first bridging terminal 20. The second contact of the energy storage unit 26 is connected to an emitter contact of the bypass switch 84.

Ferner ist der zweite Kontakt des zweiten Widerstands 96 mit dem ersten Überbrückungsanschluss 20 verbunden. Der zweite Kontakt des zweiten Widerstands 96 ist mit einem Emitterkontakt des Überbrückungsschalters 84 verbunden. Ein Kollektorkontakt des Überbrückungsschalters 84 ist mit dem zweiten Überbrückungsanschluss 22 verbunden.Further, the second contact of the second resistor 96 is connected to the first bypass terminal 20. The second contact of the second resistor 96 is connected to an emitter contact of the bypass switch 84. A collector contact of the bypass switch 84 is connected to the second bypass terminal 22.

Demnach ist der zweite Widerstand 96 parallel zu der Energiespeichereinheit 26 geschaltet. Ferner ist der Überbrückungsschalter 84 parallel zu der Verbrauchereinheit 30 geschaltet.Accordingly, the second resistor 96 is connected in parallel with the energy storage unit 26. Further, the bypass switch 84 is connected in parallel to the load unit 30.

Bezugszeichenreference numeral

1010
Schalterswitch
1212
Schalterswitch
1414
TreiberschaltkreisDriver circuit
1616
Schutzeinheitprotection unit
1818
Überbrückungseinheitbridging unit
2020
Überbrückungsanschlussbridging connection
2222
Überbrückungsanschlussbridging connection
2424
Steueranschlusscontrol connection
2626
EnergiespeichereinheitEnergy storage unit
2828
Steuereinheitcontrol unit
3030
Verbrauchereinheitconsumer unit
3232
GargerätCooking appliance
3434
Heizzoneheating zone
3636
Bedieneinheitoperating unit
3838
Induktorinductor
4040
Induktorinductor
4242
Induktorinductor
4444
Induktorinductor
4646
Wechselrichterinverter
4848
Wechselrichterinverter
5050
HalbleiterschalterSemiconductor switches
5252
HalbleiterschalterSemiconductor switches
5454
Energiequelleenergy
5656
Leitungspfadconduction path
5858
Resonanzeinheitresonance unit
6060
Schaltanordnungswitching arrangement
6262
HeizstromausgangHeizstromausgang
6464
HeizstromausgangHeizstromausgang
6666
Treibereinheitdriver unit
6868
Versorgungsanschlusssupply terminal
7070
Ankerelementanchor member
7272
Treiberspuledriving coil
7474
Schaltkontaktswitching contact
7676
RuhekontaktNormally Closed
7878
ArbeitskontaktNormally Open
8080
Steuerungsschaltercontrol switch
8282
FreilaufdiodeFreewheeling diode
8484
Überbrückungsschalterbypass switch
8686
Abszissenachseabscissa
8888
Ordinatenachseaxis of ordinates
9090
KurveCurve
9292
KurveCurve
9494
Widerstandresistance
9696
Widerstandresistance
t1 t 1
Zeitintervalltime interval
t2 t 2
Zeitintervalltime interval
t3 t 3
Zeitintervalltime interval
t4 t 4
Zeitintervalltime interval
T1 T 1
Zeitpunkttime
T2 T 2
Zeitpunkttime
T3 T 3
Zeitpunkttime
TS1 T S1
Zeitpunkttime
TS2 T S2
Zeitpunkttime
TS3 T S3
Zeitpunkttime
TS4 T S4
Zeitpunkttime

Claims (12)

  1. Cooking appliance apparatus, in particular a cooktop apparatus, with at least one mechanical switch (10, 12), at least one driver circuit (14), which is provided to activate the at least one mechanical switch (10, 12) and which comprises a protection unit (16) and a bypassing unit (18), which is provided to bypass the protection unit (16) at least partially in at least one operating state, characterised in that the bypassing unit (18) is configured as self-controlling.
  2. Cooking appliance apparatus according to claim 1, characterised in that the bypassing unit (18) has at least two bypassing connectors (20, 22) and at least one control connector (24).
  3. Cooking appliance apparatus according to claim 1 or 2, characterised in that the bypassing unit (18) is configured as current-controlled.
  4. Cooking appliance apparatus according to claim 2 or 3, characterised in that in the event of an at least essentially vanishing current strength through the at least one control connector (24), the bypassing unit (18) is provided to bypass the protection unit (16) at least partially.
  5. Cooking appliance apparatus according to one of the preceding claims, characterised in that the bypassing unit (18) has at least one energy storage unit (26), which defines at least one parameter for bypassing the protection unit (16) in at least one operating state.
  6. Cooking appliance apparatus according to claim 5, characterised in that the at least one parameter is defined by a bypassing time period.
  7. Cooking appliance apparatus according to one of the preceding claims, characterised by a control unit (28), which is provided to supply at least one control signal to control a switching state of the at least one mechanical switch (10, 12).
  8. Cooking appliance apparatus according to claim 7, characterised in that the at least one control signal is at least partially a pulse width modulated signal.
  9. Cooking appliance apparatus at least according to claim 6 and 8, characterised in that the bypassing time period corresponds to a time period for which the pulse width modulated signal has at least one low level.
  10. Cooking appliance apparatus according to one of the preceding claims, characterised in that the protection unit (16) comprises at least one consumer unit (30).
  11. Cooking appliance apparatus according to claim 10, characterised in that the bypassing unit (18) is provided to bypass the at least one consumer unit (30).
  12. Cooking appliance (32), in particular a cooktop, with at least one cooking appliance apparatus according to one of the preceding claims.
EP15715445.1A 2014-03-24 2015-03-19 Cooking appliance device having a self-controlling bypassing unit Active EP3123816B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES201430407 2014-03-24
PCT/IB2015/052015 WO2015145309A1 (en) 2014-03-24 2015-03-19 Cooking appliance device having a self-controlling bypassing unit

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EP3123816B1 true EP3123816B1 (en) 2017-12-27

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Also Published As

Publication number Publication date
ES2655654T3 (en) 2018-02-21
WO2015145309A1 (en) 2015-10-01
EP3123816A1 (en) 2017-02-01
US10440783B2 (en) 2019-10-08
US20170105250A1 (en) 2017-04-13

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