Water-conducting domestic appliance and method for operating water-conducting domestic appliance

Abstract

The invention relates to a water-conducting domestic appliance (1), in particular a dishwasher, comprising at least one electrically controllable actuator (20), a first voltage source (30) for supplying a switching power (PE) to the actuator (20) and a second voltage source (40) for supplying at least a holding power (PH) to the actuator (20), and a control unit (50), the control unit is designed to electrically connect the first voltage source (30) to the actuator (20) in order to switch on the actuator (20), and to electrically disconnect the first voltage source (30) from the actuator (20) and to electrically connect the second voltage source (40) to the actuator (20) after a switch-on interval.

Description

[0001] This application is a divisional application of the invention patent application filed on November 17, 2020, entering the Chinese national phase on June 2, 2022, with application number 202080083883.0, entitled "Water-conducting household appliance and method for operating water-conducting household appliance". Technical Field

[0002] This invention relates to a water-conducting household appliance and a method for operating the water-conducting household appliance. Background Technology

[0003] Various electrical appliances are used in known water-conducting household appliances. These appliances can operate directly using a power supply voltage, or they can operate with the aid of a voltage source providing a specific voltage. Such appliances have specific failure risks. In the event of failure, for example due to a malfunction, it must be ensured that this does not lead to other problems, such as the combustion of plastic components. Specific safety measures are in place for this purpose, such as redundant circuit design, electrical protection circuits, and the use of appropriate robust materials.

[0004] EP 1 594 227 A2 describes a circuit for switching a solenoid valve, wherein the solenoid valve responds to turn on a voltage, which is reduced after a time interval ends. EP 0 091 648 A1 describes another circuit that allows the solenoid valve to operate at two voltage levels. Summary of the Invention

[0005] In this context, the object of the present invention is to provide an improved water-conducting household appliance.

[0006] According to a first aspect, a water-guiding household appliance, particularly a dishwasher, is proposed, having at least one electrically controllable actuator. The water-guiding household appliance includes: a first voltage source for providing power to the actuator and a second voltage source for providing at least maintaining power to the actuator. A control unit is designed to: electrically connect the first voltage source to the actuator to activate it, and electrically disconnect the first voltage source from the actuator and electrically connect the second voltage source to the actuator after an activation interval.

[0007] Water-guided household appliances offer several advantages. By using two voltage sources, each designed with a smaller power rating, they can be more easily constructed, requiring less material and structural space, and offering greater operational safety. Furthermore, energy is saved because, after switching on, the actuator can operate at a lower power, and especially a lower voltage, during the holding phase compared to the switching phase. Additionally, the voltage sources can be more precisely optimized for the intended load, resulting in higher efficiency. Moreover, if the actuator is, for example, loaded with a higher switching voltage, its switching time can be shortened, as the actuator responds more quickly. Furthermore, after the first voltage source has been electrically disconnected from the actuator, it can be used to switch on another actuator without pre-loading its operation.

[0008] The actuator can be a DC or AC appliance, wherein the voltage source is accordingly designed to output a DC or AC voltage signal. Actuators include, for example, electric motors, solenoid valves, thermal actuators, or the like.

[0009] The actuator has an on / off state and an off / on state. In the off / on state, the actuator is inactive, that is, it is in a stationary position. For example, the stationary position in a valve can be either open or closed. In particular, the actuator does not consume electrical energy in the off / on state.

[0010] In order to activate the actuator, that is, to move it from an off state to an on state, the actuator requires activation power. Activation power is particularly higher than holding power, which is the power required to keep the actuator in the on state. For example, this could be due to the need for electrical energy to activate the actuator to create a magnetic field that puts the rotor into rotational motion, or also to bring the heating element of a thermal actuator to a specific temperature.

[0011] The first and second voltage sources are designed to output voltage signals. The voltage signals can be characterized, in particular, by a specific voltage, a specific current, and a specific frequency. Furthermore, the waveform, such as a sine wave, a rectangular wave, a sawtooth wave, or the like, can be specific to the voltage signal. In this respect, the voltage sources may include function generators. The voltage signals are preferably specifically designed for the actuator, such that the voltage signals provide the required on-state power or required holding power specifically suited to the actuator.

[0012] Preferably, the voltage source is designed to output a specific constant voltage. This is especially true in the case of actuators exhibiting characteristics such as ohmic resistance, where a constant voltage produces a specific power. When the resistance of the actuator is constant, the power is also constant.

[0013] The first and second voltage sources are designed for connection to a power grid, such as a public power grid. Public power grids can be constructed differently, particularly regarding voltage and / or frequency. The corresponding voltage sources are preferably designed to output voltage signals regardless of the specifications of the connected power grid. Therefore, it is feasible for water-conducting household appliances to operate in different regions of the world without having to perform voltage source adaptation.

[0014] The actuator is switched on by electrically connecting it to a first voltage source that provides the switching power. Depending on the type of actuator and, for example, the voltage of the output voltage signal, the actuator requires a certain amount of time to reach a stable switching state. This time is currently referred to as the switching interval. The switching interval can, for example, have a value between a few μs and a few seconds. For actuators, the switching interval can be determined by a predetermined time. For example, a three-second switching interval can be preset for an electric motor. However, it can also be set such that a sensor detects the position or operating state of the actuator, and the control unit determines accordingly when the actuator reaches a stable switching state, allowing switching between voltage sources. For example, in the case of an electric motor, it can be set such that the motor reaches a specific speed and maintains that speed constant for at least half a second.

[0015] If the actuator has reached the ON state, meaning it has achieved a stable operating state, then sufficient holding power is provided to keep it ON. Holding power is, for example, the power loss consumed by the actuator in the ON state. To provide holding power, a second voltage source is electrically connected to the actuator.

[0016] If the second voltage source is electrically disconnected from the actuator, the actuator will switch to the off state.

[0017] The control unit can be constructed as a standalone circuit or as part of the control device for a household appliance that controls water flow.

[0018] The control unit can be implemented using hardware and / or software technologies. In the case of a hardware implementation, the control unit can be configured as, for example, a computer or a microprocessor. In the case of a software implementation, the control unit can be configured as a computer program product, function, routine, part of program code, or an executable object.

[0019] According to one embodiment of the water-conducting household appliance, the switching power received by the actuator is greater than 50% of the maximum output power of the first voltage source.

[0020] If the first voltage source has a relatively low maximum output power, especially with low power reserve for expected continuous loads or peak loads, it can be constructed relatively simply and thus manufactured inexpensively. However, such a simply constructed voltage source is particularly incapable of providing power to both such actuators simultaneously. Therefore, it is currently feasible to use only one voltage source to operate multiple different actuators when they are being operated sequentially.

[0021] Preferably, the voltage source can provide the maximum output power of the voltage source for the duration of the switching interval. However, the maximum output power can also be the continuous power of the voltage source.

[0022] According to another embodiment of the water-guiding household appliance, it includes a plurality of electrically controllable actuators. A first voltage source is designed to provide on-state power to each individual actuator among the plurality of actuators, and a second voltage source is designed to simultaneously provide holding power to at least two actuators among the plurality of actuators. The control unit is also designed to: electrically connect the first voltage source to the first actuator among the plurality of actuators to turn on at least two actuators among the plurality of actuators; electrically disconnect the first voltage source from the first actuator after an on-state interval of the first actuator; electrically connect the second voltage source to the first actuator; electrically connect the first voltage source to another actuator among the plurality of actuators; and electrically disconnect the first voltage source from the other actuator after an on-state interval of the other actuator; and electrically connect the second voltage source to the other actuator.

[0023] The advantage of this implementation is that multiple actuators can operate using only two voltage sources, each of which can be designed to be relatively small or weak. For this purpose, the actuators are switched on sequentially, i.e., time-wise. The multiple actuators may include different actuators, which may have different switching powers and / or holding powers and / or switching intervals. The first voltage source is specifically configured to provide the highest switching power of one of the multiple actuators. The second voltage source is designed to simultaneously provide holding power to at least two of the multiple actuators.

[0024] According to another embodiment of the water-conducting household appliance, it includes a plurality of second voltage sources, wherein a corresponding second voltage source among the plurality of second voltage sources is assigned to at least one actuator and is designed to provide holding power to at least one assigned actuator.

[0025] This implementation is advantageous because each second voltage source can be designed and / or designed to output a predetermined voltage signal according to one or more allocated actuators for a predetermined maximum power. Therefore, for example, conditions regarding operational safety can be easily met, while simultaneously the voltage source is optimally designed to have very good efficiency, thereby optimizing the energy consumption of the water-conducting household appliances.

[0026] According to another embodiment of the water-conducting household appliance, the first voltage source and / or the second voltage source each have a maximum output power of 15W.

[0027] The advantages of this implementation are that circuits with a maximum power not exceeding 15W are considered low-power circuits according to DIN EN 60335-1, and the conditions for operational safety of such low-power circuits are lower than those for circuits with power exceeding 15W. This is advantageous in terms of material selection for components, such as materials for the housing or insulator, because the fire resistance requirements for these components are lower in low-power circuits. Therefore, a wide selection of different materials is feasible, which are cheaper, easier to process, have better mechanical properties, and contain fewer toxic materials compared to materials that must meet high fire resistance requirements. Thus, overall, this implementation saves resources and costs while simultaneously protecting the environment.

[0028] According to another embodiment of the water-conducting household appliance, the first voltage source has a constant output voltage up to 48V, preferably up to 24V, more preferably up to 12V, and the second voltage source has a constant output voltage up to 48V, preferably up to 24V, more preferably up to 12V.

[0029] The advantage of this implementation is that, with low output voltage, there are lower requirements for the insulation of the wiring for the pilot voltage signal and the actuators and / or circuits connected thereto. Therefore, resources and costs can be saved in this design.

[0030] A constant output voltage should not be understood as only a DC voltage signal; more precisely, it also includes an AC voltage with the effective value of the proposed voltage value.

[0031] A voltage source typically has specific circuitry configured to output only a constant output voltage. This output voltage signal is not a pulse-width modulated (PWM) voltage signal, but rather a voltage signal with specific, fixed characteristics. The corresponding voltage source may have circuitry for outputting different voltage signals, such as a circuit for outputting a 24V voltage signal and another circuit for outputting a 12V voltage signal.

[0032] By using a voltage source that does not output any pulse-width modulated voltage signal, related problems are avoided, such as high-frequency interference noise, so-called buzzing, or electromagnetic interference radiation caused by the corresponding circuitry.

[0033] According to another embodiment of the water-conducting household appliance, the first voltage source has a higher output voltage than the second voltage source, especially at least twice as high an output voltage.

[0034] This implementation makes it particularly simple to operate the actuator with reduced power during the holding phase.

[0035] According to another embodiment of the water-conducting household appliance, the holding voltage of the actuator is up to 70%, preferably up to 50%, more preferably up to 35%, and even more preferably up to 25% of the actuator's turn-on voltage.

[0036] The switching voltage is used to supply the voltage required or used by the actuator. The holding voltage is used to maintain the voltage required or used by the actuator while it is in the switched-on state.

[0037] In the case of multiple actuators, the ratio of the on-voltage to the holding voltage can be different for each actuator.

[0038] According to another embodiment of the water-guiding household appliance, the holding power of the actuator is up to 70%, preferably up to 50%, more preferably up to 35%, and even more preferably up to 25% of the switching power of the actuator.

[0039] In the case of multiple actuators, the ratio of on-power to holding power can be different for each actuator.

[0040] According to another embodiment of the water-conducting household appliance, the control unit is designed to switch the actuator from a first voltage source to a second voltage source within a switching time, wherein the switching time is shorter than the actuator's cut-off time.

[0041] When the actuator is disconnected from the voltage source, it transitions to the off state. This transition is not instantaneous but takes a certain amount of time because, for example, the rotor of an electric motor possesses rotational energy during operation, which dissipates upon disconnection. Therefore, it can also be described as the inertia of the actuator. To prevent the actuator from transitioning to the off state, holding power can be provided to the actuator during the switching time, which is ensured in this embodiment. Thus, the operation of the actuator is guaranteed.

[0042] In the case of multiple actuators, the switching time can be of different durations.

[0043] According to another embodiment of the water-conducting household appliance, in order to switch from a first voltage source to a second voltage source, the control unit is designed such that the first voltage source and the second voltage source are simultaneously connected to the actuator during the switching interval.

[0044] This implementation excludes the actuator transitioning to a disconnected state during switching. This is particularly helpful in ensuring operation, especially with actuators that have very fast response and low inertia.

[0045] The control unit can use different switching intervals for different actuators.

[0046] According to another embodiment of the water-conducting household appliance, a diode is arranged in the electrical connection between the second voltage source and the actuator, thereby interrupting the current from the first voltage source to the second voltage source.

[0047] This implementation is meaningful if the first voltage source provides a higher voltage to the actuator than the voltage provided by the second voltage source to the actuator in order to keep it switched on.

[0048] According to another embodiment of the water-conducting household appliance, the actuator includes an electromagnetic actuator, especially a solenoid valve or an electric motor, and / or a thermoelectric actuator, especially a bimetallic actuator, a phase change actuator, a shape memory alloy, a positive temperature coefficient resistor, and / or a heating element.

[0049] According to another aspect, a method is proposed for operating a water-conducting household appliance, particularly a dishwasher, having at least one electrically controllable actuator. In a first step, the actuator is electrically connected to a first voltage source, which provides power to turn on the actuator. In a second step, after the on-interval ends, the first voltage source is disconnected from the actuator. In a third step, the actuator is electrically connected to a second voltage source, which provides power for maintaining its position.

[0050] This method is preferably performed using a household appliance that guides water according to the first aspect.

[0051] The order of the steps described is not mandatory; in particular, the second voltage source may already be electrically connected to the actuator before the first voltage source is electrically disconnected from the actuator. Thus, a switching interval is derived, during which both voltage sources are electrically connected to the actuator.

[0052] Furthermore, after the actuator is connected to the first voltage source, the power received by the actuator is measured by a power measuring device and compared with the rated value for the actuator stored in the control device. The actuator is only connected to the second voltage source if the power received by the actuator does not exceed the rated value.

[0053] The advantage provided by this implementation is that, in order to meet the requirements of a low-power circuit, it is sufficient to implement only the first voltage source as a low-power voltage source, since there is no need to switch the faulty actuator to the second voltage resource.

[0054] According to another embodiment of the method, the method further includes: after the first voltage source has been disconnected from the actuator, connecting the first voltage source to another actuator to turn on the other actuator; after the turn-on interval ends, disconnecting the first voltage source from the other actuator; and connecting the other actuator to a second voltage source to keep the other actuator turned on.

[0055] In this embodiment, multiple actuators are sequentially switched on. Therefore, the first voltage source always powers only one actuator at a time, which is why the maximum power of the first voltage source can be selected based on the maximum required switching power. Conversely, the second voltage source simultaneously supplies holding power to at least two actuators. Since the holding power of the actuators is relatively low, the second voltage source can simultaneously supply its corresponding holding power to multiple actuators. The switching interval here refers to the respective actuator, and this switching interval can be different for different actuators.

[0056] Furthermore, a computer program product is proposed that causes the execution of the above-described method on a program-controlled device.

[0057] Computer program products, such as computer program media, can be provided or delivered as storage media, such as memory cards, USB sticks, CD-ROMs, DVDs, or as files downloadable from a server on a network. This can be done, for example, over a wireless communication network by transmitting the corresponding files of the computer program product or computer program media.

[0058] The implementation methods and features described for the proposed water-conducting household appliance are accordingly applicable to the proposed method.

[0059] Other possible embodiments of the invention also include combinations of features or implementations not explicitly stated above and below as described in relation to the embodiments. Those skilled in the art will also add individual aspects as improvements or supplements to the corresponding basic forms of the invention. Attached Figure Description

[0060] Other advantageous designs and aspects of the invention are the subject of the embodiments described below and the dependent claims. Furthermore, the invention will be explained in detail with reference to the accompanying drawings, based on preferred embodiments.

[0061] Figure 1 A schematic perspective view showing one embodiment of a water-conducting household appliance;

[0062] Figure 2 A schematic block diagram illustrating one embodiment of the circuit;

[0063] Figure 3A An exemplary graph showing the power output of the first and second voltage sources;

[0064] Figure 3B Another exemplary graph showing the power output of the first and second voltage sources; and

[0065] Figure 4 A schematic block diagram is shown for a method of operating a household appliance that guides water.

[0066] In the accompanying drawings, unless otherwise specified, the same or functionally equivalent elements are given the same reference numerals. Detailed Implementation

[0067] Figure 1 A schematic perspective view shows one embodiment of a water-conducting household appliance 1, configured herein as a household dishwasher. The household dishwasher 1 includes a rinsing container 2, which can be sealed, particularly watertight, by a door 3. For this purpose, a sealing device may be provided between the door 3 and the rinsing container 2. The rinsing container 2 is preferably square. The rinsing container 2 can be arranged within the housing of the household dishwasher 1. The rinsing container 2 and the door 3 can form a rinsing chamber 4 for rinsing the items to be rinsed.

[0068] Door 3 Figure 1 The door 3 is shown in its open position. The door 3 can be opened or closed by pivoting about a pivot axis 5 located at the lower end of the door 3. The conveying opening 6 of the rinsing container 2 can be opened or closed by means of the door 3. The rinsing container 2 has a bottom 7, a top 8 arranged opposite to the bottom 7, a rear wall 9 arranged opposite to the closed door 3, and two side walls 10 and 11 arranged opposite to each other. The bottom 7, top 8, rear wall 9, and side walls 10 and 11 can be made of, for example, stainless steel. Alternatively, the bottom 7 can be made of, for example, plastic material.

[0069] The household dishwasher 1 also has at least one rinseable container 12 to 14. Preferably, multiple, for example, three rinseable containers 12 to 14 may be provided, wherein the rinseable container 12 may be a lower rinseable container or a bottom basket, the rinseable container 13 may be an upper rinseable container or a top basket, and the rinseable container 14 may be a dish drawer. Figure 1It is also shown that the rinse contents 12 to 14 are arranged stacked on top of each other in the rinse container 2. Each rinse contents 12 to 14 can be selectively moved into or out of the rinse container 2. In particular, each rinse contents 12 to 14 can be pushed into or moved into the rinse container 2 in the pushing direction E and pulled out or removed from the rinse container 2 in the pulling direction A in the opposite direction of the pushing direction E.

[0070] The household dishwasher 1 also has an electrically driven actuator 20 at the door 3, which is configured, for example, as a motor for an electrically automatic door closing device. The motor 20 is designed to operate at a DC voltage of 12V. A first voltage source 30 and a second voltage source 40 are provided. The first voltage source 30 and the second voltage source 40 are configured such that their maximum output power is less than 15W. Here, the first voltage source 30 has a DC output voltage of 24V, and the second voltage source 40 has a DC output voltage of 12V. The voltage sources 30 and 40 are connected to a public power grid (not shown), which provides, for example, a 230V AC voltage at 50Hz.

[0071] Control unit 50 connects voltage sources 30 and 40 to motor 20. To turn on motor 20, for example, to cause door 3 to close, control unit 50 first connects first voltage source 30 to motor 20. The first voltage source provides turn-on power PE, here provided at 24V. The motor responds quickly with the higher voltage of 24V and has high starting torque. Therefore, motor 20 quickly reaches a stable operating state. Once motor 20 is in a stable operating state, for example, when it reaches a specific speed, control unit 50 switches from first voltage source 30 to second voltage source 40. This switching occurs during a period during which motor 20 continues to rotate, for example, due to its inertia, although no longer supplying electrical power. After the switching, second voltage source 40 is connected to motor 20 and provides holding power PH to the motor, currently provided at 12V. At 12V, motor 20 consumes less electrical energy and still maintains a stable operating state. When door 3 closes, control unit 50 disconnects second voltage source 40 from motor 20, thereby cutting off the motor.

[0072] Figure 2 A schematic block diagram showing one embodiment of the circuit, according to which voltage sources 30, 40 are connected, for example, to a circuit based on... Figure 1The automatic door closing device is located at the motor 20. Voltage sources 30 and 40 can be connected to the actuator 20 via switches 52, which are controlled by the control unit 50. As a special case, a diode 35 is arranged in the connection from the second voltage source 40 to the actuator 20. When both switches 52 are closed at the same time, the diode 35 prevents current from flowing from the first voltage source 30 into the second voltage source 40. This is especially true when the first voltage source 30 provides a higher voltage than the second voltage source 40. (See below...) Figure 3A and 3B Different variations are shown in the diagram, which are switched via control unit 50.

[0073] Figure 3A The first and second voltage sources 30 and 40 are shown (see Figure 1 An exemplary graph of the power output of (or 2) is shown. In this example, two actuators 20 (see...) Figure 1 Or 2) They are connected sequentially and run simultaneously for a certain time interval. For example, actuator 20 is the circulation pump and drain pump of a household dishwasher. The graph shows the time coordinate on the horizontal axis t and the power on the vertical axis P, which is output by the first voltage source 30 (solid line) and the second voltage source 40 (dashed line), respectively.

[0074] First, both pumps are disconnected, which is why the two voltage sources 30 and 40 have no output power. At time t0, the circulation pump is turned on first. Therefore, the first voltage source 30 outputs the turn-on power PE to the circulation pump, for example, providing this turn-on power at 48V. After the turn-on interval ends, at time t1, the circulation pump is in a stable operating state. Now, the first voltage source 30 is disconnected from the pump, which is why the power drops back to zero. A moment later, at time t2, the second voltage source 40 is connected to the pump and thereafter provides the holding power PH. The second voltage source outputs a 12V voltage signal. The holding power PH is only about 25% of the turn-on power PE, which is why the circulation pump achieves energy-saving continuous operation.

[0075] At a later time point t3, the drain pump is turned on by connecting the first voltage source 30 to the drain pump. After the drain pump reaches a stable operating state at time point t4, the first voltage source 30 is first disconnected from the drain pump, and then immediately at time point t5, the second voltage source 40 is connected to the drain pump. The second voltage source 40 now supplies electrical power to both the circulation pump and the drain pump. The output power corresponds to approximately twice the holding power PH. At time point t6, the circulation pump is turned off, i.e., the second voltage source 40 is disconnected from the circulation pump, which is why the output power drops back to the holding power PH. It should be noted that different actuators 20 may have different turn-on power PE and / or holding power PH, even if this is not shown here.

[0076] Figure 3B Another exemplary graph showing the power output of the first and second voltage sources 30, 40 is provided. Figure 3B The diagram only shows the connection process and subsequent switching. Figure 3A The difference between the two connection processes shown and the subsequent switching is that, here, the second voltage source 40 is already connected to the actuator 20 at time t1, while the first voltage source 30 remains connected to the actuator 20. The first voltage source 30 is disconnected from the actuator 20 only at time t2. Therefore, both voltage sources 30 and 40 are connected to the actuator 20 during the time interval dt = (t2 - t1). This is significant, especially when the actuator 20 can be very sensitive to voltage fluctuations, to ensure that the actuator does not switch to an off state during the switching process.

[0077] Figure 3A and 3B The graphs show the power of voltage sources 30 and 40. It should be noted that if the connected actuator 20 has ohmic characteristics, the curves shown are achieved through the corresponding output voltage.

[0078] Figure 4 Showing household appliances 1, for example, used to operate the water diversion system. Figure 1 A schematic block diagram of an exemplary method for a household dishwasher. In the first step S1, the actuator 20 (see...) Figure 1 Or 2) with the PE used to provide switching power (see Figure 3A Or 3B) First voltage source 30 (see Figure 1 Or 2) An electrical connection is used to turn on the actuator 20. In the second step S2, the first voltage source 20 is disconnected from the actuator 20 after the turn-on interval ends. In the third step S3, the actuator 20 is connected to a connection used to provide holding power PH (see...). Figure 3A Or 3B) the second voltage source 40 (see Figure 1 Or 2) Electrical connection.

[0079] In some embodiments of this method, the third step S3 may also be performed before the second step S2. Furthermore, the method can be repeated multiple times to sequentially activate multiple actuators 20 and operate them via the second voltage source 40.

[0080] Although the invention has been described with reference to embodiments, it can be modified in many ways.

[0081] The reference numerals used in the figures

[0082] 1. Water-conducting household appliances

[0083] 2. Rinse the container

[0084] 3 doors

[0085] 4. Rinse Chamber

[0086] 5 Pivot axis

[0087] 6 Conveyor opening

[0088] 7. Bottom

[0089] 8 Top

[0090] 9. Rear wall

[0091] 10 Sidewalls

[0092] 11 Sidewalls

[0093] 12. Rinse material container

[0094] 13 Rinse material container

[0095] 14. Rinse contents container

[0096] 20. Implementing agencies

[0097] 30 Voltage Source

[0098] 35 diode

[0099] 40 Voltage Source

[0100] 50 Control Unit

[0101] 52 switches

[0102] A. Pulling direction

[0103] E. Push direction

[0104] GND neutral potential

[0105] P power

[0106] PE switching power

[0107] pH holding power

[0108] S1 Method Steps

[0109] S2 Method Steps

[0110] S3 Method Steps

[0111] t Time axis

[0112] t0 time point

[0113] t1 time point

[0114] t2 time point

[0115] t3 time point

[0116] t4 time point

[0117] t5 time point

[0118] t6 is the time point.

Claims

1. A water-guiding household appliance (1), the water-guiding household appliance having at least one electrically driven actuator (20), a first voltage source (30) for providing turn-on power (PE) to the actuator (20), a second voltage source (40) for providing at least holding power (PH) to the actuator (20), and a control unit (50), the control unit being designed to: electrically connect the first voltage source (30) to the actuator (20) to turn on the actuator (20), and after a turn-on interval, electrically disconnect the first voltage source (30) from the actuator (20) and electrically connect the second voltage source (40) to the actuator (20), wherein, The water-guiding household appliance is provided with a plurality of electrically driven actuators (20), wherein a first voltage source (30) is designed to provide the on-state power (PE) to each individual actuator (20) of the plurality of actuators, and wherein a second voltage source (40) is designed to simultaneously provide the holding power (PH) to at least two actuators (20) of the plurality of actuators, wherein the control unit (50) is also designed to connect the first voltage source (30) to the first actuator of the plurality of actuators in order to turn on at least two actuators (20) of the plurality of actuators. The mechanism (20) is electrically connected, and after the on-off interval of the first actuator (20), the first voltage source (30) is electrically disconnected from the first actuator (20), and the second voltage source (40) is electrically connected to the first actuator (20), and the first voltage source (30) is electrically connected to another actuator (20) among the plurality of actuators, and after the on-off interval of the other actuator (20), the first voltage source (30) is electrically disconnected from the other actuator (20), and the second voltage source (40) is electrically connected to the other actuator (20).

2. The water-conducting household appliance according to claim 1, wherein, The household appliance that directs the water is a dishwasher.

3. The water-conducting household appliance according to claim 1, wherein, The power supplied (PE) received by the actuator (20) is greater than 50% of the maximum output power of the first voltage source (30).

4. The water-conducting household appliance according to any one of claims 1 to 3, characterized in that, A plurality of second voltage sources (40) are provided, wherein a corresponding second voltage source (40) of the plurality of second voltage sources is assigned to at least one actuator (20), and the corresponding second voltage source is designed to provide the holding power (PH) to at least one assigned actuator (20).

5. The water-conducting household appliance according to any one of claims 1 to 4, characterized in that, The first voltage source (30) and / or the second voltage source (40) each have a maximum output power of 15W.

6. The water-conducting household appliance according to any one of claims 1 to 5, characterized in that, The first voltage source (30) has a constant output voltage up to 48V, and the second voltage source (40) has a constant output voltage up to 48V.

7. The water-conducting household appliance according to any one of claims 1 to 6, characterized in that, The first voltage source (30) has a higher output voltage than the second voltage source (40).

8. The water-conducting household appliance according to claim 7, characterized in that, The first voltage source (30) has an output voltage that is at least twice as high as that of the second voltage source (40).

9. The water-conducting household appliance according to any one of claims 1 to 8, characterized in that, The holding voltage of the actuator (20) is up to 70% of the turn-on voltage of the actuator (20).

10. The water-conducting household appliance according to any one of claims 1 to 9, characterized in that, The holding power (PH) of the actuator (20) is up to 70% of the on power (PE) of the actuator (20).

11. The water-conducting household appliance according to any one of claims 1 to 10, characterized in that, The control unit (50) is designed to switch from the first voltage source (30) to the second voltage source (40) within a switching time, wherein the switching time is shorter than the cut-off time of the actuator (20).

12. The water-conducting household appliance according to any one of claims 1 to 11, characterized in that, In order to switch from the first voltage source (30) to the second voltage source (40), the control unit (50) is designed such that during the switching interval, the first voltage source (30) and the second voltage source (40) are simultaneously connected to the actuator (20).

13. The water-conducting household appliance according to claim 12, characterized in that, A diode (35) is arranged in the electrical connection between the second voltage source (40) and the actuator (20) to interrupt the current from the first voltage source (30) to the second voltage source (40).

14. The water-conducting household appliance according to any one of claims 1 to 13, characterized in that, The actuator (20) includes an electromagnetic actuator and / or a thermoelectric actuator.

15. A method for operating a water-guiding household appliance (1), said water-guiding household appliance having at least one electrically driven actuator (20), said method comprising: The actuator (20) is connected to a first voltage source (30) (S1), the first voltage source being used to provide the power (PE) for turning on the actuator (20); After the connection interval ends, the first voltage source (30) is disconnected from the actuator (20) (S2); and The actuator (20) is connected to a second voltage source (40) (S3), the second voltage source being used to provide a holding power (PH) for keeping the actuator (20) switched on. in, The method further includes: After the first voltage source (30) has been disconnected from the actuator (20), the first voltage source (30) is connected to another actuator (20) to turn on the other actuator (20); After the connection interval ends, the first voltage source (30) is disconnected from the other actuator (20); and The additional actuator (20) is connected to the second voltage source (40) to keep the actuator (20) on.

16. The method according to claim 15, characterized in that, The household appliance that directs the water is a dishwasher.

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