Domestic appliance device, domestic appliance, and method for operating a domestic appliance device

Abstract

The invention relates to a domestic appliance device (10), in particular an induction hob device (20), comprising at least one main supply switch (12), at least one filter unit (14), which has at least one filter capacitor (24), and at least one rectifier (38). In order to increase ease of use and energy efficiency, according to the invention the domestic appliance device (10) has at least one filter discharge unit (26) for discharging at least the filter capacitor (24) and has at least one additional rectifier (28) and at least one additional capacitor (30).

Description

[0001] Household appliance, household appliance and method for operating a household appliance

[0002] The invention relates to a household appliance device according to the preamble of claim 1, a household appliance according to claim 10 and a method for operating a household appliance device according to claim 11.

[0003] Household appliances with a main power switch, an EMC filter unit including a filter capacitor, and a rectifier are already known from the prior art. CN 109217654 A shows a dissipative discharge of the filter capacitor via at least one resistance element.

[0004] US 9985542 B2, EP 3068022 B1 and WO 2022022977 A1 disclose further possibilities for discharging a capacitor, in particular a filter capacitor.

[0005] The object of the invention is, in particular but not limited to, to provide a generic device with improved properties regarding ease of use and energy efficiency. This object is achieved according to the invention by the features of claim 1, claim 10, and claim 11, while advantageous embodiments and further developments of the invention can be found in the subclaims.

[0006] The invention relates to a household appliance device, in particular an induction hob device, with at least one main supply switch, with at least one filter unit which has at least one filter capacitor, and with at least one rectifier.

[0007] It is proposed that the household appliance device has at least one filter discharge unit for discharging at least the filter capacitor, which has at least one additional rectifier and at least one additional capacitor.

[0008] Such a configuration can provide ease of use and / or safety, in particular through particularly rapid discharging of the filter capacitor, in particular at least in a standby mode of the household appliance in which the main supply switch is in an open state. In particular, a capacitance of the filter capacitor can advantageously be increased to achieve increased filtering performance, since a short discharging period can be provided, in particular even for a large capacitance of the filter capacitor. Advantageously, the main supply switch can be closed again particularly quickly after the main supply switch has been opened and the filter capacitor has subsequently been discharged, for example while limiting an inrush current at least at the filter capacitor and / or the main supply switch when the main supply switch is closed.In particular, the household appliance can be returned to operating mode particularly quickly after switching from an operating mode, in which, in particular, the main power switch is closed, to standby mode. Furthermore, the safety of the household appliance can be increased, in particular by avoiding electric shocks when an installer and / or an operator touches the filter capacitor, advantageously at least in standby mode. Furthermore, energy efficiency can be advantageously increased by regeneratively discharging the filter capacitor by means of the filter discharge unit, in particular with only an insignificant energy loss.

[0009] A "household appliance device" should be understood in particular as at least one part, preferably a subassembly, of a household appliance. The household appliance device preferably has at least one part of an electrical and / or electronic circuit and preferably the entire electrical and / or electronic circuit of the household appliance. The household appliance device, in particular the circuit, is preferably arranged on a printed circuit board. The household appliance device can also comprise the entire household appliance. The household appliance device is preferably designed as an induction hob device, which is designed in particular as at least one part, in particular as a subassembly, of a household appliance designed as an induction hob.Alternatively, the household appliance device can be designed as a part, in particular as a subassembly, of any household appliance deemed appropriate by a person skilled in the art, which in particular comprises at least the main power switch, in particular for connection to a mains current, and the filter unit, in particular for filtering the mains current, and the rectifier. For example, it is conceivable for the household appliance to be designed as any cooking appliance deemed appropriate by a person skilled in the art, in particular a microwave or an oven and / or a resistance hob and / or a grill and / or a steamer, or as a household cooling appliance, for example a refrigerator and / or freezer or an air conditioner, or as a household cleaning appliance, such as a washing machine and / or a dryer or a dishwasher, or as the like.

[0010] The main supply switch is preferably designed as an electromechanical relay. Advantageously, the load capacity and / or reliability and / or cost-effectiveness of the main supply switch can be increased. In particular, the complexity of the main supply switch can be reduced. Alternatively, another configuration of the main supply switch that would appear appropriate to a person skilled in the art would be conceivable, for example, as a semiconductor switch. In a closed state, the main supply switch is preferably provided for transmitting a main current and / or a main voltage originating from a main supply unit. The main supply switch is preferably in the closed state at least in the main operating state of the household appliance device, and in particular of the household appliance.Preferably, the main supply switch is provided in an open state to interrupt the transmission of the main current and / or the main voltage. The main supply switch is preferably in the open state at least in a standby mode of the household appliance device and in particular of the household appliance, whereby safety and / or energy efficiency can be increased in particular. Preferably, an open state of the main supply switch can be controlled by an operator via a user interface, in particular of the household appliance and / or the household appliance device. The main supply unit is preferably part of the household appliance device. Preferably, the main supply unit provides the main voltage and in particular the main current.The main current is preferably embodied as an alternating current, in particular as a mains current, and the main supply unit is embodied in particular as a grid connection to a power transmission network. The main voltage can be single-phase, two-phase, or three-phase. The main voltage is preferably embodied as an alternating voltage, in particular as a mains voltage. Alternatively, the main supply unit can be embodied as at least one generator or the like. Preferably, the household appliance device and in particular the household appliance are at least partially operable by means of the main current and / or the main voltage. The household appliance, preferably the household appliance device, has in particular at least one functional unit operable by means of the main current and / or the main voltage, which functional unit is provided in particular to provide a function of the household appliance.The functional unit is preferably designed as an induction unit of the induction hob, in particular of the induction hob device. The induction unit preferably has at least one induction coil and is designed, in particular, to emit inductive energy, in particular for inductive heating and / or an inductive energy supply. Alternatively, the functional unit can be designed, for example, as an electric motor, for example of a household appliance designed as a washing machine or to drive a compressor of a household refrigerator, or the like. The functional unit is preferably operable only when the main supply switch is closed, in particular to provide the intended function, in particular by means of the main current and / or the main voltage.The functional unit is preferably operable by means of a supply current and / or a supply voltage, which can be generated in particular by means of the main current and / or the main voltage, wherein the functional unit, in particular the at least one induction coil, is preferably provided for the supply current to flow through it in order to provide the function. The supply current is preferably designed as a main current that is at least filtered and in particular rectified by means of the rectifier and / or smoothed and / or reversed by means of a bus capacitor, wherein the same applies in particular to the supply voltage with regard to the main voltage. The household appliance device preferably has the bus capacitor. The bus capacitor is preferably designed as a smoothing capacitor and is provided in particular for smoothing a current and / or a voltage originating from the rectifier.The rectifier is preferably designed as a bridge rectifier; however, any other rectifier design deemed appropriate by a person skilled in the art is alternatively conceivable. The rectifier is preferably connected downstream of the main supply switch, in particular of the filter unit, in particular at least along a reference current direction. The reference current direction preferably correlates to a first polarity, in particular a positive or alternatively a negative polarity, of the main current and is in particular designed as a current direction of the main current. The household appliance device preferably has at least one inverter connected downstream, in particular of the rectifier and preferably of the bus capacitor, in particular at least along the reference current direction, which inverter in particular provides the supply current and / or the supply voltage.The rectifier is preferably connected downstream of the filter unit, in particular at least along the reference current direction, wherein an alternating voltage, in particular the main voltage, can advantageously be applied to the filter unit, in particular to the filter capacitor.

[0011] The filter unit is preferably designed as an EMC filter unit, particularly one known to those skilled in the art. The filter unit preferably has more than one filter capacitor, for example, exactly two filter capacitors. The at least one filter capacitor is preferably designed as an interference suppression capacitor, in particular of class X, for example subclass X2 or the like, and is in particular intended at least to filter overvoltage peaks due to lightning strikes and / or mains disturbances and / or the like. The filter unit preferably has at least one choke, in particular designed as a choke coil, and for example, exactly four chokes. In terms of circuitry, the filter unit preferably has the filter capacitor and the choke alternatingly. Alternatively, another design of the filter capacitor that appears appropriate to those skilled in the art is conceivable.

[0012] The filter discharge unit is preferably provided for discharging the filter capacitor at least along one discharge path, in particular in a circuit of the household appliance. The filter discharge unit is preferably arranged at least partially along the discharge path. The additional capacitor is arranged in particular along the discharge path. The additional rectifier is preferably arranged at least partially along the discharge path. The additional rectifier preferably has at least one additional rectifying element arranged along the discharge path. The additional rectifying element is preferably designed as a unidirectional component, in particular as a diode. The additional rectifier preferably has more than one additional rectifying element, for example exactly three or exactly four additional rectifying elements.The additional rectification elements preferably have the same conduction direction, in particular with respect to the filter capacitor. The additional rectification elements can be designed discretely, in particular differently from a single-piece design. The additional rectification elements can be designed as high-side rectification elements, in particular with respect to low-side rectification elements of the rectifier. The additional capacitor is preferably connected downstream of the additional rectifier, in particular in series, wherein the additional capacitor is connected downstream of at least the additional rectifier element along the discharge path. The additional rectification elements can be connected in parallel to one another and are preferably each connected upstream of the additional capacitor, in particular in series.The additional capacitor can, for example, have a capacitance of at least substantially 10 pF, wherein a capacitance of at least substantially 10 pF deviates in particular by less than 25%, preferably less than 10%, and particularly preferably less than 5% of a capacitance of 10 pF from the capacitance of 10 pF. Alternatively, any value of the capacitance of the additional capacitor that appears reasonable to a person skilled in the art is conceivable. The filter discharge unit is preferably provided for at least substantially regenerative discharging of the filter capacitor, in particular with only an insignificant, for example dissipative, energy loss of less than 25%, preferably less than 10%, and particularly preferably less than 5% of a charge of the filter capacitor. The filter discharge unit is preferably provided to completely discharge the filter capacitor.Alternatively, it would be conceivable for the filter discharge unit to be designed only for partial discharging of the filter capacitor. The filter discharge unit can be designed for synchronized discharging, particularly with respect to the main voltage.

[0013] “Provided” should be understood to mean specially programmed, designed and / or equipped. The fact that an object is intended for a specific function should be understood to mean that the object fulfills and / or executes this specific function in at least one application and / or operating state. Furthermore, it is proposed that the filter discharge unit is provided to discharge the filter capacitor in an open state of the main supply switch, in particular the one mentioned above. The discharge path is preferably provided in the open state of the main supply switch. In particular, the filter discharge unit is advantageously provided to discharge the filter capacitor in the standby mode of the household appliance.Advantageously, a residual charge of the filter capacitor can be removed from the filter capacitor after an electrical connection between the filter capacitor and the main supply unit has been disconnected via the main supply switch. In particular, safety can be increased by avoiding electric shock when touching the filter capacitor in standby mode. The filter discharge unit can be provided to discharge the filter capacitor only when the main supply switch is open. Alternatively, the filter discharge unit can be provided to discharge the filter capacitor at least when the main supply switch is open, and in particular also when the main supply switch is closed.The filter discharge unit preferably provides the discharge path, at least in the open state and / or only in the open state of the main supply switch, which path is in particular connected at least partially in parallel to the main supply switch. The filter capacitor can be connected in parallel with the main supply switch. The filter discharge unit is preferably connected at least partially in parallel to the main supply switch. The main supply switch is preferably connected in parallel with at least a part, in particular at least one additional rectification element, of the additional rectifier. The discharge path preferably runs along the main supply unit. The discharge path preferably runs along a discharge node, and in particular a line connected to the discharge node parallel to the main supply switch, which line is connected between the main supply unit and the main supply switch.The additional rectifier is preferably connected at least partially downstream of the discharge node, in particular along the discharge path. Preferably, at least one additional rectifying element is connected downstream of the discharge node, in particular at least along the discharge path, in particular in series. Preferably, a further filter unit is connected between the main supply unit, in particular the discharge node, and the additional rectifying element. Advantageously, the main voltage and / or the main current can be filtered along the discharge path, in particular when the main supply switch is open. The further filter unit can be provided for filtering the main voltage and / or the main current to supply a power supply unit, in particular a power supply unit (PSU), which can be provided, for example, to supply a control unit and / or the operator interface.Advantageously, in particular the control unit and / or the user interface can be supplied with a filtered main voltage and / or the filtered main current even when the main supply switch is open. The further filter unit is preferably provided for operation at least in standby mode and can in particular be designed as a PSU filter. The further filter unit preferably has at least one filter coil. The main supply switch and / or the discharge node are / is preferably arranged on an outer conductor of the household appliance device and in particular contact this. Alternatively, it would be conceivable for the main supply switch and / or the discharge node to be arranged on a neutral conductor and in particular to contact this. The additional rectifier and the rectifier preferably have a common reference.Preferably, at least one further additional rectification element is connected, in particular directly, downstream of a node connected between the filter unit and the rectifier. Preferably, two further additional rectification elements of the additional rectifier are connected, in particular directly, downstream of a respective node connected between the filter unit and the rectifier, wherein one node is arranged on the outer conductor and one node is arranged on the neutral conductor.

[0014] The main supply switch is preferably connected between the main supply unit and the filter unit. The main supply switch is preferably connected directly downstream of the main supply unit, in particular at least along the reference current direction. The filter unit is preferably connected directly downstream of the main supply switch, in particular at least along the reference current direction. Preferably, transmission of the main voltage and / or the main current can be suspended in the open state of the main supply switch, in particular after discharging the filter capacitor, in particular at least in the standby mode of the household appliance.Advantageously, the filter capacitor can be advantageously discharged in the open state of the main supply switch, in particular compared to a configuration in which the filter unit is connected directly downstream of the main supply unit and the filter capacitor is continuously loaded by the main voltage and / or the main current. In particular, the duration of the load on the filter unit, in particular on the at least one filter capacitor, with the main voltage and in particular on the main current can be reduced, thereby advantageously reducing degradation of the filter unit, which can be accelerated, for example, by wetness and humidity. Advantageously, the service life of the filter unit, in particular on the at least one filter capacitor, can be increased and / or requirements for the filter unit, in particular with regard to resistance to the load, can be reduced.Alternatively, it would be conceivable for the main supply switch to be arranged on a side of the filter unit that is facing away from the main supply unit in terms of circuitry.

[0015] The filter capacitor is chargeable, in particular, when the main supply switch is closed. In particular, the filter unit is provided for filtering the main voltage and / or the main current to charge the filter capacitor. The charge of the filter capacitor is variable, in particular, with the main voltage and / or the main current. The charge of the filter capacitor is, in particular, embodied as at least one charged voltage. Preferably, a polarity of the charged voltage of the filter capacitor for the closed main supply switch corresponds, in particular simultaneously, to a polarity of the main voltage.A value of the charged voltage of the filter capacitor for the closed main supply switch preferably corresponds, in particular simultaneously, at least substantially to a value of the main voltage, wherein the value of the charged voltage of the filter capacitor deviates from the value of the main voltage by in particular less than 25%, preferably less than 10%, and particularly preferably less than 5% of the value of the main voltage. Furthermore, it is proposed that the charge, in particular the charged voltage, of the filter capacitor in the open state of the main supply switch, in particular before discharging by means of the filter discharge unit, correlate with a main voltage during a most recent opening operation of the main supply switch.

[0016] Advantageously, the filter unit can filter the main voltage and / or the main current particularly efficiently. In particular, the main supply switch can transmit the main voltage and / or the main current with particularly low losses. Advantageously, particularly dissipative charge losses at the filter capacitor can be reduced. In the open state of the main supply switch, in particular at least before discharging by means of the filter discharge unit, the filter capacitor preferably has the charge, in particular the charged voltage, with a polarity corresponding to the polarity of the main voltage during the most recent opening operation of the main supply switch.Preferably, in the open state of the filter capacitor, in particular before discharging by means of the filter discharge unit, the filter capacitor has the charge, in particular the charged voltage, which corresponds at least substantially to the value of the main voltage at, in particular immediately before the start of, the last preceding opening operation of the main supply switch.

[0017] It is also proposed that the additional capacitor, in particular at least in the open state of the main supply switch, be chargeable with a charge of the filter capacitor, in particular the charge mentioned above, for discharging the filter capacitor. In particular, the at least substantially regenerative discharging can be advantageously provided by means of the filter discharge unit, whereby in particular the energy efficiency of the household appliance can be increased. Preferably, the discharging can be provided particularly quickly and / or reliably, in particular compared to dissipative discharging at at least one resistance element. Preferably, the additional capacitor is chargeable with the entire charge of the filter capacitor for the complete discharge of the filter capacitor. The additional rectifier is preferably at least partially interposed between the additional capacitor and the filter capacitor, in particular along the discharge path.The additional capacitor is preferably connected downstream of the additional rectifier along the discharge path. The discharge path, in particular, forms a closed circuit. The closed circuit of the discharge path preferably runs along a discharge direction from the additional capacitor via the rectifier back to the filter capacitor. The discharge path preferably runs along the rectifier. The additional capacitor can be provided with stability, in particular resistance, against an overvoltage, for example, occurring when the additional capacitor is charged with the charge of the filter capacitor.

[0018] It is further proposed that the filter capacitor, in particular at least in the open state of the main supply switch, be dischargeable for only one polarity of the charge, in particular by means of the filter discharge unit. Preferably, the additional capacitor is chargeable for only one polarity of the charge, in particular the charged voltage, in particular due to the additional rectifier along the discharge path. The discharge path preferably has the fixed discharge direction, in particular predetermined by at least the additional rectifier. The discharge direction preferably corresponds to a forward direction of the additional rectifier element, in particular designed as a diode. Advantageously, the discharge of the filter capacitor can be provided particularly efficiently. In particular, the charge transferred to the additional capacitor during the discharge of the filter capacitor can be removed particularly advantageously from the additional capacitor.The filter capacitor is preferably dischargeable, particularly by means of the filter discharge unit, for only a negative polarity of the charge, particularly when the main supply switch is open. Alternatively, it is conceivable that the filter capacitor is dischargeable for only a positive polarity of the charge, particularly when the main supply switch is open, by means of the filter discharge unit.

[0019] It is further proposed that the filter discharge unit have a voltage source connected in parallel with the additional capacitor. Advantageously, a particularly efficient and, in particular, repeatable discharge of the filter capacitor can be provided. In particular, a current flow along the discharge path can be stimulated. The voltage source is preferably provided to apply a voltage to the additional capacitor that is opposite to the polarity of the charge, in particular the charged voltage, of the filter capacitor to be discharged, in particular at least in the open state of the main supply switch. Preferably, the voltage source is provided to compensate for and / or consume the charge transferred to the additional capacitor, in particular of the filter capacitor.The voltage source can be provided to apply the voltage to the filter capacitor, which excites a current flow along the discharge path. The voltage source is preferably provided to apply a voltage to the additional capacitor that is opposite to the forward direction, in particular of the additional rectifying elements, of the additional rectifier. The filter discharge unit is preferably provided to discharge the filter capacitor, in particular in the open state of the main supply switch, at a polarity of the main voltage that is opposite to the polarity of the charge of the filter capacitor, in particular at least in the open state of the main supply switch. The polarity of the main voltage and the voltage of the voltage source preferably coincide with the discharge of the filter capacitor, in particular in the open state of the main supply switch.The voltage source is preferably designed to apply a positive voltage to the auxiliary capacitor, in particular at least when the main supply switch is open. Alternatively, it would be conceivable for the voltage source to apply a negative voltage to the auxiliary capacitor, in particular at least when the main supply switch is open. The voltage source is preferably designed as a DC voltage source. Alternatively, it would be conceivable for the voltage source to be designed as an AC voltage source.

[0020] Furthermore, it is proposed that the household appliance device comprise a control unit designed to open the main supply switch at a polarity, in particular the above-mentioned, of a main voltage, which correlates with and in particular corresponds to a polarity of a charge, in particular the above-mentioned, of the filter capacitor that can be discharged by means of the additional capacitor. Advantageously, the filter capacitor can have the charge that can be transferred to the additional capacitor when the main supply switch is open.In particular, compared to a configuration in which a charge on the filter capacitor is eliminated in the open state of the main supply switch by opening the main supply switch at exactly one zero crossing of the main voltage, an increased time period for opening the main supply switch when the charge on the filter capacitor can be eliminated can be provided by means of the filter discharge unit. Advantageously, control of the main supply switch for eliminating the charge on the filter capacitor can be simplified and / or made more reliable. The main supply switch, particularly in a configuration as the electromechanical relay, typically has a delay on the order of 1 ms to 4 ms, which is, for example, unreliable, particularly dependent on a driver and / or a temperature and / or a production batch.Preferably, the control unit is provided to open the main supply switch only at the polarity of the main voltage that corresponds to the polarity of the charge of the filter capacitor that can be transferred to the additional capacitor. In particular, the transfer of the charge of the filter capacitor to the additional capacitor and thus, in particular, particularly rapid discharging can be advantageously ensured. Preferably, the control unit is provided to open the main supply switch at the negative polarity of the main voltage, which in particular corresponds to a negative polarity of the filter capacitor upon opening and in particular in the open state of the main supply switch before discharging. The charge of the filter capacitor with the negative polarity can be discharged in the open state of the main supply switch, preferably by means of the filter discharge unit, and in particular can be transferred to the additional capacitor.The household appliance device preferably has at least one determination unit, which is provided at least for determining the polarity of the main voltage. The determination unit preferably has a low consumption, for example less than 4 mW, at least in standby mode. The determination unit is preferably provided to transmit a determination result to the control unit. The control unit is preferably provided for controlling, in particular at least for opening, at least the main supply switch depending on the polarity of the main voltage, in particular determined by means of the determination unit. The control unit is preferably provided for controlling the at least one inverter; alternatively, however, it would also be conceivable for a further control unit, for example of the household appliance device, to be provided for controlling the inverter.A "control unit" should be understood in particular to mean a unit with at least one control electronics unit. A "control electronics unit" should be understood in particular to mean a unit with a processor unit and with a memory unit as well as with an operating program stored in the memory unit. Alternatively, it would be conceivable for the control unit to be provided for opening the main supply switch when the polarity of the main voltage is positive, which corresponds in particular to a positive polarity of the filter capacitor when opening and in particular in the open state of the main supply switch before discharging. The charge of the filter capacitor with the positive polarity can be discharged in the open state of the main supply switch by means of the filter discharge unit and in particular can be transferred to the additional capacitor.

[0021] It is further proposed that the household appliance device comprise an inrush current limiting unit for limiting an inrush current at least at the filter capacitor by charging at least the filter capacitor before closing the main supply switch. The inrush current limiting unit is preferably provided for limiting the inrush current, in particular from the main supply unit, at least when the main supply switch is closed. The inrush current limiting unit is preferably provided for limiting the inrush current at the filter capacitor and in particular at the main supply switch and / or at the bus capacitor, in particular when the main supply switch is closed. Advantageously, a voltage drop at least at the main supply switch when closing the main supply switch can be reduced or avoided by previously charging at least the filter capacitor.The inrush current limiting unit can, in particular, increase the service life of the main supply switch and at least the filter unit, in particular of the at least one filter capacitor, and in particular of at least part of the circuit of the household appliance. Advantageously, a high inrush current can prevent the main supply switch from becoming stuck, and thus, in particular, a failure of the household appliance for a non-closable main supply switch, in particular for an NC contact of the main supply switch, or a loss of a safety function of an unopenable main supply switch, in particular for an NO contact of the main supply switch.In particular, a trade-off between the robustness of the main supply switch with respect to the inrush current and the current transmission capabilities of the main supply switch, which depend in particular on a metal alloy of the contacts of the main supply switch, can be optimized for a particularly high current transmission, in particular a nominal current. To limit the inrush current, the filter capacitor can be charged with a voltage, in particular originating from the main supply unit, preferably by means of the main current and / or the main voltage. The inrush current limiting unit can be provided for additionally charging the bus capacitor before the main supply switch is closed. The inrush current limiting unit can be connected in parallel to the main supply switch.The inrush current limiting unit can have at least one switching element, which can be controlled in particular by means of the control unit and which can be closed for charging in the open state of the main supply switch, in particular for transmitting the main voltage and / or the main current to the filter capacitor.

[0022] Alternatively, it is conceivable that the main supply switch is designed to limit the inrush current when the main voltage crosses zero.

[0023] The filter discharge unit is preferably provided for discharging, in particular completely, the filter capacitor in the open state of the main supply switch before closing, in particular reclosing, the main supply switch. The control unit is preferably provided, in particular depending on an operator operation at the operator interface, to close the main supply switch after discharging, in particular completely, the filter capacitor. Advantageously, the main supply switch can be closed again particularly quickly after opening, in particular due to the particularly rapid discharging of the filter capacitor by means of the filter discharge unit.

[0024] It is further proposed that the filter discharge unit be provided for discharging the filter capacitor prior to charging, in particular the filter capacitor by means of the inrush current limiting unit. Advantageously, the charging of the filter unit by means of the inrush current limiting unit and thus in particular the limitation of the inrush current upon closing of the main supply switch can be provided particularly reliably. In particular, a voltage drop at the main supply switch upon closing of the main supply switch can be avoided due to incomplete charging of the filter capacitor, in particular caused by precharging the filter capacitor prior to charging by means of the inrush current limiting unit. The filter discharge unit is preferably provided for complete discharging of the filter capacitor prior to charging, in particular the filter capacitor by means of the inrush current limiting unit.The filter discharge unit can, for example, be provided for completely discharging the filter capacitor before closing the switching element of the inrush current limiting unit. The control unit is preferably provided, particularly depending on the operator operation at the operator interface, to control the inrush current limiting unit after the filter capacitor has been completely discharged, in particular completely.

[0025] In addition, a method for operating a household appliance, in particular the one mentioned above, with at least one main supply switch, in particular the one mentioned above, with at least one filter unit, in particular the one mentioned above, which has at least one filter capacitor, in particular the one mentioned above, and with at least one rectifier, in particular the one mentioned above, is proposed, wherein at least one filter discharge unit, in particular the one mentioned above, which has at least one additional rectifier, in particular the one mentioned above, and at least one additional capacitor, in particular the one mentioned above, discharges at least the filter capacitor. Advantageously, ease of use and / or energy efficiency and / or safety of the household appliance can be increased, in particular by particularly rapid and / or regenerative discharging of the filter capacitor.The method preferably comprises a method step, in particular a main supply switch opening step, in which the main supply switch is opened, in particular by means of a control unit, in particular the one mentioned above. The main supply switch is opened, in particular in the main supply switch opening step, preferably at a predetermined, in particular negative, polarity of a main voltage, in particular the one mentioned above. In the open state of the main supply switch, in particular after the main supply switch opening step, the filter capacitor preferably has a charge, in particular the one mentioned above, with a polarity corresponding to the polarity of the main voltage when the main supply switch is opened, in particular the negative polarity.Alternatively, it would be conceivable for the main supply switch to be opened when the main voltage polarity is positive, particularly in the main supply switch opening step. In a further method step, particularly a filter discharge step, the filter capacitor is preferably discharged by means of the filter discharge unit, particularly in the open state of the main supply switch. Preferably, the filter capacitor is discharged, particularly in the filter discharge step, by transferring the charge of the filter capacitor to the additional capacitor, particularly along the additional rectifier. The filter discharge step takes place, in particular, after the main supply switch opening step.The method may comprise a further method step, in particular a main supply switch closing step, in which the main supply switch is closed, in particular by means of the control unit, preferably after the filter capacitor has been completely discharged by means of the filter discharge unit, in particular as a function of an operator operation at an operator interface, in particular the above-mentioned operator interface, for example according to a closing process, which comprises charging, in particular the above-mentioned charging, by means of an inrush current limiting unit, in particular the above-mentioned. The main supply switch opening step takes place, in particular, after the filter discharge step.

[0026] The household appliance, the household appliance, and the method for operating the household appliance are not intended to be limited to the application and embodiment described above. In particular, the household appliance, the household appliance, and the method for operating the household appliance may have a number of individual elements, components, units, and method steps that differs from the number stated herein to fulfill a functionality described herein.

[0027] Further advantages will become apparent from the following description of the drawings. The drawings illustrate an embodiment of the invention. The drawings, the description, and the claims contain numerous features in combination. Those skilled in the art will conveniently consider the features individually and combine them into useful further combinations. They show:

[0028] Fig. 1 A schematic plan view of a household appliance designed as an induction hob with a household appliance device,

[0029] Fig. 2 shows a simplified circuit diagram of a household appliance device with a main supply switch and a filter capacitor,

[0030] Fig. 3 shows the simplified circuit diagram from Figure 2 in a closed state of the main supply switch with two marked charging paths,

[0031] Fig. 4 shows the simplified circuit diagram from Figure 2 in an open state of the main supply switch with a marked discharge path for discharging the filter capacitor,

[0032] Fig. 5 shows an exemplary graph regarding the discharge of the filter capacitor for opening the main supply switch at a negative polarity of a main voltage,

[0033] Fig. 6 shows the simplified circuit diagram from Figure 2 in an open state of the main supply switch with two marked dissipative discharge paths to a dissipative discharge of the filter capacitor,

[0034] Fig. 7 shows an exemplary graph relating to a dissipative discharge of the filter capacitor for opening the main supply switch at a positive polarity of a main voltage and

[0035] Fig. 8 is a flowchart of a method for operating the household appliance device.

[0036] Figure 1 shows a schematic plan view of a household appliance 50 designed as an induction hob 52.

[0037] Alternatively, the household appliance 50 can be designed as any household appliance (not shown) that appears appropriate to a person skilled in the art, for example as another cooking appliance or as a household cooling appliance, in particular as an air conditioner, or as a household cleaning appliance or the like.

[0038] The household appliance 50 comprises a household appliance device 10. The

[0039] Household appliance 10 is designed as an induction hob device 20. In this case, household appliance 10 is designed as at least part of an electrical and / or electronic circuit 40 of household appliance 50. Alternatively, it is conceivable for household appliance 10 to comprise the entire household appliance 50.

[0040] The household appliance 50, in particular the household appliance device 10, has a user interface 58. The household appliance device 10 has a control unit 22, which can be adjusted by an operator (not shown) in particular via the user interface 58, for example, at least to start or end a standby mode of the household appliance 50.

[0041] Figure 2 shows a simplified circuit diagram of the household appliance device 10. The household appliance device 10 has a main power switch 12. The main power switch 12 is designed as an electromechanical relay. Alternatively, another design of the main power switch 12 that would be considered appropriate by a person skilled in the art would be conceivable, for example, as a semiconductor switch.

[0042] The main supply switch 12 is provided in a closed state for transmitting a main current and a main voltage originating from a main supply unit 36. The main supply switch 12 is closed in at least one operating state of an induction unit (not shown) for emitting inductive energy from the induction unit. The main supply switch 12 is provided in an open state for suspending the transmission of the main current and the main voltage.

[0043] The main supply unit 36 ​​is part of the household appliance 10. The household appliance 10, in particular at least the induction unit, is operable using the main current and the main voltage. The main supply unit 36 ​​is configured as a mains connection to a power transmission network. The main voltage is configured as a mains voltage. The main current is configured as a mains current. Alternatively, the main supply unit 36 ​​can be configured as at least one generator or the like.

[0044] The household appliance device 10 has at least one filter unit 14, which has at least one filter capacitor 24. The filter unit 14 is designed as an EMC filter unit. The filter capacitor 24 is designed as an interference suppression capacitor, in particular of Class X. The filter capacitor 24 has a capacitance of at least 100 nF. The filter capacitor 24 can, for example, have a capacitance of 4.4 pF. Alternatively, a different filter capacitor 24 known to those skilled in the art and / or a different capacitance value of the filter capacitor 24 is conceivable.

[0045] The filter unit 14 has more than one filter capacitor 24, although only one filter capacitor 24 is designated. In the present case, the filter unit 14 has exactly two filter capacitors 24. Alternatively, another configuration of the filter unit 14 that appears appropriate to a person skilled in the art and is particularly well known is conceivable.

[0046] The household appliance 10 has at least one rectifier 38. The rectifier 38 is connected downstream of the filter unit 14. The rectifier 38 is intended to convert the main current, which is filtered in particular by the filter unit 14, into a direct current. The rectifier 38 is designed as a bridge rectifier. Alternatively, another design of the rectifier 38 that would be deemed appropriate by a person skilled in the art is conceivable.

[0047] The household appliance device 10 has at least one bus capacitor 18. The bus capacitor 18 is connected downstream of the rectifier 38. The rectifier 38 is provided to apply the direct current to the bus capacitor 18 and, in particular, to charge it. The bus capacitor 18 is designed as a smoothing capacitor. The bus capacitor 18 is provided to smooth the direct current originating from the rectifier 38. The bus capacitor 18a can, for example, have a capacitance of 6 pF to 7 pF. Alternatively, a different capacitance value for the bus capacitor 18 is conceivable.

[0048] The household appliance device 10 has at least one inverter (not shown) connected downstream of the bus capacitor 18. The household appliance device 10 has at least one functional unit (not shown), in particular the induction unit, which is connected downstream of the bus capacitor 18, in particular the inverter. The induction unit, in particular at least one induction coil of the induction unit, can be supplied with alternating current generated by the inverter. An equivalent resistance element 42 schematically represents at least the inverter and the functional unit, in particular the induction unit. The main supply switch 12 is connected between the main supply unit 36 ​​and the filter unit 14. The filter unit 14 is connected directly downstream of the main supply switch 12, at least along a reference current direction 46.The reference current direction 46 corresponds in this case to a positive polarity of the main voltage.

[0049] The household appliance 10 has at least one filter discharge unit 26 for discharging at least the filter capacitor 24. The filter discharge unit 26 is provided for at least substantially regenerative discharging of the filter capacitor 24. The filter discharge unit 26 is provided for completely discharging the filter capacitor 24. Alternatively, it would be conceivable for the filter discharge unit 26 to be provided only for partially discharging the filter capacitor 24.

[0050] The filter discharge unit 26 has at least one additional rectifier 28 and at least one additional capacitor 30. The additional capacitor 30 is connected downstream of the additional rectifier 28. The additional capacitor 30 is connected in series with the additional rectifier 28. The additional capacitor 30 can, for example, have a capacitance of at least substantially 10 pF. Alternatively, a different capacitance value for the additional capacitor 30 is conceivable.

[0051] The additional rectifier 28 has at least one additional rectifying element 48. The additional rectifying element 48 is designed as a diode. The at least one additional rectifying element 48 is connected upstream of the additional capacitor 30. The at least one additional rectifying element 48 is connected in series with the additional capacitor 30.

[0052] The additional rectifier 28 has at least one, in particular exactly two, additional rectifying elements 68, wherein only one additional rectifying element 68 is designated. The additional rectifying elements 48, 68 are identical to one another.

[0053] The filter capacitor 24 can be charged with a charge, in particular a charged voltage, in particular when the main supply switch 12 is closed. The charge, in particular the charged voltage, of the filter capacitor 24 has at least one polarity, in particular at least substantially one value, of the main voltage when the main supply switch 12 is closed. Figure 3 shows a simplified circuit diagram of the household appliance device 10 with a designated charging path 70, in particular through the additional capacitor 30, in the closed state of the main supply switch 12 with a negative polarity of the main voltage, and with a designated charging path 72, in particular through the additional capacitor 30, in the closed state of the main supply switch 12 with a positive polarity of the main voltage.

[0054] Figure 4 shows a simplified circuit diagram of the household appliance device 10 for the open state of the main supply switch 12, in particular in a discharge state of the household appliance device 10, with a marked discharge path 34 for discharging the filter capacitor 24 by means of the filter discharge unit 26. The discharge path 34 runs along a discharge direction 54.

[0055] The filter discharge unit 26 is arranged at least partially along the discharge path 34. The additional capacitor 30 is arranged along the discharge path 34. The additional rectifying element 48, in particular exactly one, is arranged along the discharge path 34. The discharge path 34 runs along the main supply unit 36.

[0056] The filter discharge unit 26 is provided to discharge the filter capacitor 24 when the main supply switch 12 is open. The filter discharge unit 26 provides the discharge path 34 when the main supply switch 12 is open. The discharge path 34 is connected in parallel to the main supply switch 12, at least in sections.

[0057] The discharge path 34 runs along a discharge node 44. The discharge node 44 is connected between the main supply unit 36 ​​and the main supply switch 12. The additional rectifying element 48, in particular exactly one, is connected downstream of the discharge node 44, in particular a branch 56 originating from the discharge node 44, along the discharge direction 54. The branch 56 is connected in parallel with the main supply switch 12.

[0058] A further filter unit 64 is connected between the main supply unit 36 ​​and the filter discharge unit 26. The further filter unit 64 is connected between the discharge node 44 and the additional rectifying element 48. The further filter unit 64 is connected in parallel with the main supply switch 12. The further filter unit 64 has at least one filter coil 66. Alternatively, any configuration of the further filter unit 64 that appears appropriate to a person skilled in the art is conceivable, in particular in a configuration as a standby filter and / or PSU filter, for example for supplying the operator interface 58.

[0059] The at least one further additional rectifying element 68 is connected, in particular directly, downstream of a node 60 which is connected between the filter unit 14 and the rectifier 38.

[0060] The charge of the filter capacitor 24, in the open state of the main supply switch 12, is correlated with the main voltage during a most recent opening operation of the main supply switch 12. The charge, in particular the charged voltage, of the filter capacitor 24 is unchangeable in the open state of the main supply switch 12 before discharging, in particular free of discharge by means of the filter discharge unit 26.

[0061] The polarity of the charge of the filter capacitor 24 corresponds in the open state of the main supply switch 12, in particular before discharging, to the polarity of the main voltage during the last preceding opening operation of the main supply switch 12. The charge of the filter capacitor 24 corresponds in the open state of the main supply switch 12, in particular before discharging, at least substantially to the main voltage during the last preceding opening operation of the main supply switch 12.

[0062] The additional capacitor 30 can be charged with the charge of the filter capacitor 24 to discharge the filter capacitor 24. The additional capacitor 30 can be charged with the charge of the filter capacitor 24 to discharge the filter capacitor 24, at least in the open state of the main supply switch 12.

[0063] The additional capacitor 30 can be charged with the entire charge of the filter capacitor 24 in order to completely discharge the filter capacitor 24.

[0064] The additional rectification element 48 is connected between the filter capacitor 24 and the additional capacitor 30 along the discharge path 34. The filter discharge unit 26 has a voltage source 32 connected in parallel with the additional capacitor 30. The voltage source 32 is provided to apply a voltage to the additional capacitor 30 that is opposite to the charge, in particular the charged voltage, of the filter capacitor 24 to be discharged in the open state of the main supply switch 12. The voltage source 32 is provided to consume the charge of the filter capacitor 24 transferred to the additional capacitor 30 during the discharge.

[0065] A circuit of the voltage source 32, and in particular a load of the voltage source 32 that consumes power from the additional capacitor 30, is represented here for the sake of simplicity as a resistor component. However, the voltage source 32 is not actually embodied as the resistor component shown. The voltage source 32 is merely represented as the resistor component. The voltage source 32 can, in particular, be embodied as a power supply unit.

[0066] The filter discharge unit 26 is provided to discharge the filter capacitor 24 in the open state of the main supply switch 12 at a main voltage polarity that is opposite to the charge polarity of the filter capacitor 24. The polarity of the main voltage and the voltage of the voltage source 32 match the discharge of the filter capacitor 24, particularly in the discharge state in the open state of the main supply switch 12.

[0067] The household appliance 10 has an inrush current limiting unit 16 for limiting an inrush current at least at the filter capacitor 24 by charging at least the filter capacitor 24 before the main supply switch 12 is closed. The inrush current limiting unit 16 is provided for limiting the inrush current originating from the main supply unit 36 ​​when the main supply switch 12 is closed. The inrush current limiting unit 16 is provided for limiting the inrush current at the main supply switch 12. The inrush current limiting unit 16 is provided for limiting the inrush current by charging the filter capacitor 24 with a voltage using the main current and / or the main voltage. The filter unit 14 is connected downstream of the inrush current limiting unit 16a, for example, at least along the reference current direction 46a, for example directly.The inrush current limiting unit 16 is shown only schematically here, with a purely exemplary connection of the inrush current limiting unit 16 to a remainder of the household appliance device 10 being shown. Any configuration of the inrush current limiting unit 16 that appears appropriate to a person skilled in the art is possible.

[0068] The filter discharge unit 26 is provided for discharging the filter capacitor 24 before closing the main supply switch 12. The filter discharge unit 26 is provided for discharging the filter capacitor 24 before charging, in particular the filter capacitor 24 by means of the inrush current limiting unit 16. The filter discharge unit 26 is provided for completely discharging the filter capacitor 24 before charging by means of the inrush current limiting unit 16.

[0069] The filter capacitor 24 can be discharged for only one polarity of the charge. When the main supply switch 12 is open, the filter capacitor 24 can be discharged for only one polarity of the charge, in particular the charged voltage of the filter capacitor 24, by means of the filter discharge unit 26. The auxiliary capacitor 30 can be charged for only one polarity of the charge of the filter capacitor 24. The discharge path 34 has the fixed discharge direction 54, which is predetermined at least by the auxiliary rectifier 28.

[0070] When the main supply switch 12 is open, the filter capacitor 24 can be discharged by means of the filter discharge unit 26 for only the negative polarity of the charge. Alternatively, an embodiment of the invention is conceivable in which the filter capacitor 24 can be discharged by means of the filter discharge unit 26 for only the positive polarity of the charge when the main supply switch 12 is open.

[0071] The control unit 22 is provided for controlling, in particular at least opening, at least the main supply switch 12 depending on the polarity of the main voltage. The household appliance device 10 in the present case has a voltage dividing element 62, which is provided for dividing the voltage at least for determining the polarity of the main voltage. The voltage dividing element 62 is connected in parallel with the filter capacitor 24. The voltage dividing element 62 can alternatively have any arrangement in the household appliance device 10 that appears appropriate to a person skilled in the art. Alternatively or additionally, the household appliance device 10 can have any determination unit that appears appropriate to a person skilled in the art for determining at least the polarity of the main voltage.

[0072] The control unit 22 is designed to open the main supply switch 12 at the polarity of the main voltage, which correlates with the polarity of the charge of the filter capacitor 24, which can be discharged by means of the additional capacitor 30, in particular when the main supply switch 12 is open. The control unit 22 is designed to open the main supply switch 12 at the polarity of the main voltage, which corresponds to the polarity of the charge of the filter capacitor 24, which can be discharged by means of the filter discharge unit 26, in particular when the main supply switch 12 is open.

[0073] The control unit 22 is provided for opening the main supply switch 12 at the negative polarity of the main voltage, which in particular corresponds to the negative polarity of the filter capacitor 24 in the open state of the main supply switch 12 after opening.

[0074] Alternatively, it would be conceivable for the control unit 22 to be configured to open the main supply switch 12 at the positive polarity of the main voltage, which corresponds in particular to a positive polarity of the filter capacitor 24 in the open state of the main supply switch 12 after opening. In the open state of the main supply switch 12, the filter capacitor 24 can be discharged by means of the filter discharge unit 26, in particular only for the positive polarity of the charge of the filter capacitor 24.

[0075] Figure 5 shows an exemplary graph of voltages on an axis 74 in volts versus an axis 76 of a time in milliseconds at the opening of the

[0076] Main supply switch 12 at the negative polarity of the main voltage and a subsequent discharging of the filter capacitor 24 along the discharge path 34 (see Figure 4). For example, the main supply switch 12 is closed in this case when the main voltage crosses zero. A curve 78 shows the main voltage. A curve 80 shows a signal to the control of the main supply switch 12, wherein a voltage value of the signal is zero, in particular in the open state, and for one, in particular the one single, value of the voltage of the signal is not equal to zero in the closed state. A delay in the response of the main supply switch 12 to the signal is neglected here for a better understanding of the figure. A curve 82 shows the charged voltage of the filter capacitor 24.The filter capacitor 24 has the charged voltage for the closed state of the main supply switch 12, in particular at least substantially, corresponding to the main voltage.

[0077] In the present case, the filter capacitor 24 can be completely discharged by means of the filter discharge unit 26 after the main supply switch 12 has been opened at a negative main voltage, for example within less than 300 ms.

[0078] Figure 6 shows a simplified circuit diagram of the household appliance device 10 for the open main supply switch 12, which was opened in particular at the positive main voltage, with a first dissipative discharge path 84 and a second dissipative discharge path 86 drawn in for discharging the filter capacitor 24.

[0079] If the voltage of the filter capacitor 24 is less than a voltage at a, in particular positive, bus node 94 and greater than the main voltage, only the first dissipative discharge path 84 is provided, in particular by the voltage divider element 62. If the voltage of the filter capacitor 24 is greater than the voltage at the, in particular positive, bus node 94 and greater than the main voltage, the first dissipative discharge path 84 is provided, in particular by the voltage divider element 62, and the second dissipative discharge path 86 is provided, in particular by the equivalent resistance element 42, for example the inverter.

[0080] Figure 7 shows an exemplary graph of voltages upon opening the main supply switch 12 at the positive polarity of the main voltage and a subsequent only dissipative discharge of the filter capacitor 24.

[0081] Curve 90 shows a signal to the control of the main supply switch 12, whereby the main supply switch 12 is opened at a positive maximum of the main voltage. Curve 92 shows the charged voltage across the filter capacitor 24.

[0082] In this case, after the main supply switch 12 is opened, the filter capacitor 24 can only be fully dissipatively discharged within a time interval of more than 1 s when the main voltage is positive. Typically, the filter capacitor 24 can only be fully dissipatively discharged within a time interval of more than 5 s, in particular more than 10 s.

[0083] Figure 8 shows a flowchart of a method for operating the household appliance device 10, wherein the at least one filter discharge unit 26 discharges at least the filter capacitor 24.

[0084] The method includes a main supply switch opening step 100, in which the main supply switch 12 is opened. In the main supply switch opening step 100, the main supply switch 12 is opened at a predetermined, in this case negative, polarity of the main voltage.

[0085] In a filter discharge step 102 of the method, the filter capacitor 24 is discharged by means of the filter discharge unit 26. In the filter discharge step 102, the charge, in particular the negative charge, of the filter capacitor 24 is transferred to the additional capacitor 30.

[0086] The method includes a main supply switch closing step 104, in which the main supply switch 12 is closed after discharging the filter capacitor 24 by means of the filter discharge unit 26. In the main supply switch closing step 104, the filter capacitor 24 is charged by means of the inrush current limiting unit 16 before closing the main supply switch 12.

[0087] Of multiple objects, only one is provided with a reference symbol in the figures.

[0088] 10 household appliance device

[0089] 12 main supply switches

[0090] 14 Filter unit

[0091] 16 Inrush current limiting unit

[0092] 18 Bus capacitor

[0093] 20 Induction hob device

[0094] 22 Control unit

[0095] 24 filter capacitor

[0096] 26 Filter discharge unit

[0097] 28 additional rectifiers

[0098] 30 Additional capacitor

[0099] 32 Voltage source

[0100] 34 Discharge path

[0101] 36 Main supply unit

[0102] 38 rectifiers

[0103] 40 circuit

[0104] 42 equivalent resistance element

[0105] 44 Unloading hub

[0106] 46 Reference current direction

[0107] 48 Additional rectifying element

[0108] 50 household appliances

[0109] 52 induction hob

[0110] 54 Discharge direction

[0111] 56 Junction

[0112] 58 User interface

[0113] 60 junction

[0114] 62 voltage divider element

[0115] 64 additional filter unit filter coil additional rectifier element

[0116] Charging path

[0117] Charging path

[0118] axis

[0119] axis

[0120] curve

[0121] curve

[0122] Curve first dissipative discharge path second dissipative discharge path

[0123] curve

[0124] curve

[0125] Bus hub

[0126] Main supply switch opening step

[0127] Filter discharge step

[0128] Main supply switch closing step

Claims

Claims 1. Household appliance device (10), in particular an induction hob device (20), with at least one main supply switch (12), with at least one filter unit (14) which has at least one filter capacitor (24), and with at least one rectifier (38), characterized by at least one filter discharge unit (26) for discharging at least the filter capacitor (24), which has at least one additional rectifier (28) and at least one additional capacitor (30).

2. Household appliance device (10) according to claim 1, characterized in that the filter discharge unit (26) is provided to discharge the filter capacitor (24) in an open state of the main supply switch (12).

3. Household appliance device (10) according to claim 2, characterized in that the charge of the filter capacitor (24) in the open state of the main supply switch (12) correlates with a main voltage in a last previous opening operation of the main supply switch (12).

4. Household appliance device (10) according to one of the preceding claims, characterized in that the additional capacitor (30) can be charged with a charge of the filter capacitor (24) in order to discharge the filter capacitor (24).

5. Household appliance device (10) according to claim 4, characterized in that the filter capacitor (24) is dischargeable for only one polarity of the charge.

6. Household appliance device (10) according to one of the preceding claims, characterized in that the filter discharge unit (26) has a voltage source (32) which is connected in parallel with the additional capacitor (30).

7. Household appliance device (10) according to one of the preceding claims, characterized by a control unit (22) which is provided for opening the main supply switch (12) in the case of a, in particular negative, polarity of a main voltage which correlates to a polarity of a charge of the filter capacitor (24) which can be discharged by means of the additional capacitor (30).

8. Household appliance device (10) according to one of the preceding claims, characterized by an inrush current limiting unit (16) for limiting an inrush current at least at the filter capacitor (24) by charging at least the filter capacitor (24) before closing the main supply switch (12).

9. Household appliance device (10) according to claim 8, characterized in that the filter discharge unit (26) is provided for discharging the filter capacitor (24) before charging.

10. Household appliance (50), in particular induction hob (52), with a household appliance device (10) according to one of the preceding claims.

11. Method for operating a household appliance (10), in particular according to one of claims 1 to 9, with at least one main supply switch (12), with at least one filter unit (14) which has at least one filter capacitor (24), and with at least one rectifier (38), characterized in that at least one Filter discharge unit (26), which has at least one additional rectifier (28) and at least one additional capacitor (30), discharges at least the filter capacitor (24).

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