COOKING APPLIANCE

Abstract

Cooking appliance (1), in particular commercial cooking appliance, comprising • a housing (2), • a cooking chamber (3) in the housing (2) and a door (4) for closing the cooking chamber (3), • a heating device (9) for heating the cooking chamber (3), • a first consumer group (53) which is arranged in a first load circuit (50) for the purpose of supplying power, wherein the first consumer group (53) contains a plurality of consumers, • a fan arrangement (13) with an electric motor (14) for generating circulating air in the cooking chamber (3), wherein the fan arrangement (13) is arranged in a fan load circuit (52) for power supply, • and a power supply (30), wherein the first load circuit (50) is connected to a first load circuit terminal (35) of the power supply (30) and wherein the fan load circuit (52) is connected to a fan load circuit terminal (37) of the power supply (30), wherein the power supply unit (30) comprises a first load circuit switch (39) for switching the first load circuit (50) and a fan load circuit switch (41) for switching the fan load circuit (52), wherein the first load circuit (50) and / or the fan load circuit (52) are DC load circuits.

Description

The invention relates to a cooking appliance, in particular a commercial cooking appliance, for the treatment of foodstuffs.DE 103 49 814 A1 relates to a microwave appliance or a combination oven with microwave operation. To improve the reliability of the device safety and to reduce the device manufacturing costs, a microwave device is specified, comprising an electronic circuit for controlling the device functions, at least one cooking chamber for food, at least one door for opening and closing the cooking chamber, at least one door switch which ensures that the microwave operation is or is switched off when the door is opened and / or when the door is opened, and at least one fail-safe device for the door switch which ensures that the microwave operation is and / or is switched off when the door switch function fails, wherein the fail-safe device is integrated in terms of circuit technology into a low power range of the electronic circuit of the microwave device.DE 10 2010 002 877 A1 relates to a method for operating a household appliance having at least two electrical consumers, wherein the function of at least one of the electrical consumers is checked by means of a control device of the household appliance. After finding a fault of the checked electrical load, fault information is generated by the control device, by means of which the faulty electrical load is unambiguously identified.KR 10 0 671 828 B1 relates to an apparatus and a method for controlling cooking of a microwave oven capable of preventing curing of food by maintaining the temperature of a cooking space at a predetermined value after a defrosting mode is performed.It is the object of the present invention to specify a cooking appliance, in particular for commercial use, which ensures reliable and operator-friendly operation with a compact construction.The object is achieved by the features of the independent claim. The dependent claims are subject of preferred embodiments of the invention.Thus, the invention shows a cooking appliance illustrated below. The cooking appliance is in particular a commercial cooking appliance. Accordingly, the cooking appliance is designed in particular for use in commercial kitchens. The cooking appliance can be, for example, a hot circulating air appliance or a steam cooker. In particular, it is provided that the cooking appliance enables both the function of hot circulating air and steam cooking. Furthermore, it is preferably provided that the cooking appliance shown here is designed for the treatment, in particular for cooking, of foods for human consumption.The cooking appliance comprises a housing. A cooking chamber is located in the housing. This cooking chamber can be closed by means of a door. In particular, the door is attached to the housing via at least one door hinge and is thus pivotable. The pivot axis of the door is preferably vertical.Furthermore, the cooking appliance comprises a heating device for heating the cooking chamber. The heating device is in particular designed as an electric heating device. Preferably, the heating device comprises at least one heating element which is arranged on and / or in the cooking chamber. Preferably, it is a resistance heating device, wherein the at least one heating element has a corresponding electrical resistance, so that it can be used for heating the cooking chamber when current is supplied. Additionally or alternatively, the heating device can also be designed for heating with gas as fuel.Furthermore, the cooking appliance comprises a first load group which is arranged in a first load circuit for supplying power. A plurality of consumers are located in the first consumer group. In particular, it is provided that the cooking appliance comprises a human-machine interface, referred to below as MMS. Via this MMS, a user of the cooking appliance can receive information about the cooking appliance and / or make operating inputs. The MMS comprises, for example, a display, in particular a touch display, and / or at least one illuminated display and / or at least one switch that can be actuated by the user and / or a microphone for a voice control and / or a camera for monitoring the cooking chamber and / or a camera for monitoring the insertion region in front of the cooking chamber. The MMS is preferably located in the first load group and is thus supplied with current via the first load circuit.In addition, the first consumer group can also have further consumers-referred to generally as consumer elements below. Preferably, it is provided that the first consumer group comprises as consumer elements: at least one sensor, in particular a temperature sensor, and / or an illumination, in particular a cooking chamber illumination, and / or at least one fan and / or at least one switchable valve, in particular a hand shower, and / or at least one pump.The cooking appliance preferably comprises a blower arrangement. This blower arrangement has an electric motor for generating circulating air in the cooking chamber. For this purpose, it is provided in particular that the electric motor is connected to a corresponding blower wheel. The blower wheel is located in particular in or on the cooking chamber. Preferably, the impeller is coaxially connected to the electric motor, so that the output shaft of the electric motor directly drives the impeller without a gear.The electric motor is preferably a direct current motor. The electric motor is particularly preferably a brushless direct current motor. Furthermore, the blower arrangement can comprise motor electronics (also referred to as motor control). This motor electronics is connected upstream of the electric motor and controls the electric motor accordingly, for example at the desired speed or with a desired acceleration or deceleration ramp.The fan assembly is powered in a fan load circuit. In particular, the electric motor in the blower load circuit is supplied with current via the motor electronics.In addition, the cooking appliance comprises a power supply unit with a first load circuit connection and a blower load circuit connection. It is explained in the following that the power supply unit can optionally have at least one second load circuit connection. It is understood that the power supply unit can also have further load circuits. Thus, in particular, the "at least one second load circuit" with the associated second load circuit switch is representative of further load circuits and further load circuit switches.The first load circuit connection and the at least one second load circuit connection and the blower load circuit connection can also be referred to as outputs of the power supply unit.The first load circuit of the cooking appliance is connected to the first load circuit connection of the power supply unit. The blower load circuit of the cooking appliance is connected to the blower load circuit connection of the power supply unit.The power supply unit preferably comprises a first load circuit switch for switching the first load circuit and a blower load circuit switch for switching the blower load circuit. If the power supply unit has the optional second load circuit connection, it is preferably also provided that the power supply unit comprises a second load circuit switch for switching the second load circuit.It is preferably provided that both the first load circuit and the blower load circuit can be switched on and off via the associated switch in the power supply unit (first load circuit switch or blower load circuit switch). There is therefore no need for a separate module to switch these load circuits. In particular, this results in a very compact design and a simple design of the safety concept. In particular, the supply of the blower arrangement via the common power supply unit results in this possibility for a compact configuration and for a reliable shutdown of the blower arrangement by shutting down the blower load circuit by means of the blower load circuit switch.The switches in the power supply unit-first load circuit switch and / or second load circuit switch and / or blower load circuit switch-are in particular designed and arranged such that each load circuit can be switched selectively and thus independently of the other load circuit. Accordingly, it is preferably provided that the first load circuit can be selectively switched by means of the first load circuit switch without necessarily switching the other load circuits. Additionally or alternatively, it is preferably provided that the blower load circuit can be selectively switched by means of the blower load circuit switch without necessarily switching the other load circuits. Additionally or alternatively, it is preferably provided that the second load circuit can be selectively switched by means of the second load circuit switch without necessarily switching the other load circuits.The power supply unit is preferably designed for connection to an alternating current power supply system. In particular, this is an alternating current network in a building. For this purpose, the power supply unit preferably comprises an AC / DC converter. The AC / DC converter is preferably ~ or 1N for a three-phase wide input voltage range of 3 ~200-480 volts and / or a single-phase wide input voltage range of 1N. 2 ~100-240 V.The first load circuit and / or the blower load circuit are DC load circuits. The second load circuit is preferably a DC load circuit. Accordingly, it is preferably provided that the first load circuit connection and / or the blower load circuit connection and / or the second load circuit connection are designed as DC voltage outputs of the power supply unit.Furthermore, it is preferably provided that the AC / DC converter or converters is / are designed to supply the plurality of load circuit connections with different voltages. For example, a voltage of 36 volts is provided for the blower load circuit, whereas 24 volts is preferably provided for the first load circuit and / or for the second load circuit.Furthermore, it is preferably provided that the power supply unit has an EMC filter.Furthermore, it is preferably provided that the power supply unit has a power monitoring module which is connected via a power monitoring bus to at least one load of the first load group and / or of the second load group. In particular, the power monitoring bus is connected to the MMS, so that corresponding information, for example about the current consumption in the individual load circuits, can be displayed via the MMS.The power supply unit is in particular a single, self-contained unit. In particular, the power supply unit has its own power supply unit housing. The power supply unit is preferably located within the housing of the cooking appliance. The power supply unit can project at least partially from the housing of the cooking appliance and / or be arranged at an opening of the housing, for example in order to ensure cooling.Particularly preferably, the AC / DC converter and the switches (first load circuit switch and / or blower load circuit switch and / or second load circuit switch) are arranged within the one power supply unit housing, in particular on a common printed circuit board.The cooking appliance preferably comprises a door switch arrangement which is designed to detect a position of the door. This is particularly advantageous since certain safety measures can be taken depending on the door. For example, when the door is opened, the electric motor of the blower arrangement is to be switched off in order to avoid any injuries due to the rotating blower wheel. Further, to enhance safety, it may be necessary to turn off the heater when the door is opened.It is thus preferably provided that the door switch arrangement is designed to detect whether the door is open or closed.In addition, the cooking appliance is preferably designed to switch off the fan load circuit by means of the fan load circuit switch when the open door is detected. Furthermore, it is provided in particular that the cooking appliance is designed to switch the blower load circuit on again via the blower load circuit switch when the closed door is detected.In cooking appliances, the door is often initially opened a gap, so that the steam can escape from the cooking chamber. It can be advantageous here that the fan arrangement is still active in order to convey the steam to the outside as quickly as possible through the gap. However, if the door is opened further, the blower arrangement is to be switched off.Therefore, the door switch arrangement is preferably designed to not shut off the blower load circuit in the case of an opening gap up to a predetermined size and to shut off the blower load circuit in the case of an opening gap above the predetermined size. The predetermined size is in particular 20 mm to 70 mm.The cooking appliance preferably comprises a second consumer group. The second load group or the loads in the second load group is / are arranged for the power supply in the already mentioned second load circuit. As described, the second load circuit is connected to the second load circuit connection of the power supply unit. The power supply unit comprises, for the optional second load circuit connection, a second load circuit switch for switching the second load circuit, that is to say for selectively switching this load circuit on and off.The door switch arrangement is preferably arranged between the second load circuit connection and the second load group; in particular, the power supply to the second load group takes place via the door switch arrangement. The door switch arrangement is preferably designed to switch off the second load group depending on the detected position of the door.In the second load group and thus in the second load circuit, there are in particular loads which are to be switched off when the door is open. As already mentioned, the blower arrangement is deactivated by the blower load circuit switch of its own upon opening of the door. In addition, however, it is preferably also provided that further elements of the cooking appliance are deactivated when the door is open. This includes, for example, the heating device and / or a circulation of a cleaning fluid in the cooking chamber.Thus, it is preferably provided that at least one heating switch is located in the second load group. Particularly preferably, a plurality of these heating switches are provided in order to be able to switch the heating device on or off in different stages. These heating switches are in particular electromagnetic relays or semiconductor relays or other power electronics.The at least one heating switch is preferably designed such that it is off in the non-energized state, i.e. when the second load circuit is switched off, and thus no longer energizes the associated heating element.As mentioned, the circulation of the cleaning fluid can also be located in the second consumer group and thus in the second load circuit. This cleaning fluid is pumped or injected into the cooking chamber, in particular, with a corresponding pump. To deactivate this circulation, a circulation switch is preferably provided. This circulation switch can, for example, switch off the associated pump or actuate a valve accordingly, so that the cleaning fluid is no longer conveyed into the cooking chamber. The circulation switch is preferably located in the second load circuit and is preferably designed such that it prevents the circulation of the cleaning fluid in the non-energized state.In a simple embodiment, in which only the states "door open" and "door closed" are to be distinguished, it may be sufficient if the door switch arrangement comprises a door switch.In a preferred embodiment, it is provided that the door switch arrangement comprises a first door switch and a second door switch. The two door switches are arranged offset to one another along the door gap, i.e. either on the door or on the housing; one of the two door switches is in this case located in particular closer to the at least one door hinge. As a result, when the door is opened, first the one door switch, which is located further away from the hinge panel, reacts, and only later the second door switch, as a result of which it can be differentiated whether the door is only a small gap or is opened further. Furthermore, this makes it possible to easily change the stop side of the door, wherein one or the other door contact supplies the relevant signal depending on the stop side.By taking into account the door position, in particular by means of the interrogation via the two door switches, the electric motor of the blower arrangement can remain activated and as a result hot air can be expelled from the door gap which is formed. This is advantageous especially when changing from a hot recipe to sensitive foods, e.g. low-temperature cooking of fish. There is no risk that users will come to the rotating blower wheel.The door switch arrangement preferably comprises a door switch logic unit which correspondingly connects the switching states of the two door switches to one another. For example, this can be a simple logic link which only deactivates the power supply of the second load group and / or supplies the signal to the blower load circuit switch when both door switches are open.Both when using the one door switch and when using the two door switches, these door switches can be designed as contactless and contacting switches. For the design of the contacting switch, a spring-loaded pin can be arranged, for example, on the housing side or on the door side, which pin is pressed in by the door or the housing. The contactless door switch can be designed, for example, as an optical switch or proximity switch.Furthermore, it is also provided to detect the position of the door in another way. For example, a rotation angle sensor can be arranged in the region of the door hinge strips, which detects both the position of the door as a component of the door switch arrangement.As mentioned, the power supply unit is designed for connection to an AC voltage power supply system. It is preferably provided that the heating device is likewise designed for connection to this alternating voltage grid and in particular is not supplied with current via the power supply unit. In contrast, the fan arrangement is in particular not designed for connection to the AC voltage grid, since the fan arrangement and in particular the electric motor are supplied with current via the fan load circuit and thus via the grid device.The cooking appliance has in particular a connecting cable which projects out of the housing and can be connected to an AC voltage connection, in particular a 1-phase or 3-phase AC voltage connection, of a building. Alternatively to the connection cable, a plug or a clamping device for connecting a corresponding connection cable can also be provided in or on the housing of the cooking appliance. Inside the housing, the supplied alternating voltage is supplied to both the power supply unit and the heating device.The heating device preferably comprises a main contactor which is supplied with the alternating voltage on the input side and is connected on the output side to the at least one heating switch, in particular to the plurality of heating switches. The at least one heating switch in turn switches the at least one heating element. In particular, a single-phase or three-phase supply of a plurality of heating elements is provided. Accordingly, a plurality of heating switches are also provided in order to selectively switch the individual phases.The main contactor is located in particular in the housing of the cooking appliance, but outside the power supply unit.Preferably, a safety circuit is provided. This safety circuit preferably has one or more safety temperature limiters which switch off the main contactor / s. The safety circuit, in particular the safety temperature limiter / s, is preferably supplied with current via the first load circuit.Furthermore, it is preferably provided that the power supply unit is connected to the safety circuit and is designed to switch off the fan load circuit by means of the fan load circuit switch and / or to switch off the second load circuit by means of the second load circuit switch when the main contactor is switched off. It is particularly preferably provided here that, when the main contactor is switched off, the first load circuit is not switched off. As a result, at least basic functions, such as the MMS, remain active. For example, it can be indicated on the MMS that the main contactor has been switched off due to too high a temperature.Furthermore, it is preferably provided that the cooking appliance comprises an appliance switch. This device switch is arranged in particular for actuation, in particular touching, by a user. The device switch is preferably located on the front side of the cooking device; that is to say on the same side as the door of the cooking device.The device switch is preferably connected directly or indirectly to the first load circuit switch for switching the first load circuit switch and / or directly or indirectly to the second load circuit switch for switching the second load circuit switch and / or directly or indirectly to the blower load circuit switch for switching the blower load circuit switch. The indirect connection takes into account in particular that the device switch is connected to a microcontroller in the power supply unit. In the microcontroller of the power supply unit, the signal can be evaluated by the device switch. The microcontroller in turn is designed to actuate the respective load circuit switch as a function of the signal from the device switch. In particular, a separate digital output of the microcontroller serves as the input of the load circuit switch / switches (hardware gate).In particular, the device switch is designed to be placed in different, in particular more than two, switching positions by the user. For example, the device switch can be switched into these different switching states by switching several times and / or by switching over a longer time and / or by a specific switching pattern. This makes it possible to selectively actuate the first load circuit switch and the blower load circuit switch and optionally also the second load circuit switch via the one single device switch. As a result, functions such as on / off, standby and rebooting can be carried out, for example. For the off state of the cooking appliance, for example, all load circuits are switched off. For the standby mode, for example, the first load circuit can remain switched on, the other two load circuits (second load circuit and blower load circuit) being switched off. For a reboot, it may be sufficient, for example, to briefly switch off the first load circuit and then switch it on again.Further details, advantages and features of the present invention are evident from the following description of exemplary embodiments with reference to the drawing. It shows: FIG. 1 shows a schematic front view of a cooking appliance according to the invention according to an exemplary embodiment, FIG. 2 shows a schematic side view of a cooking appliance according to the invention according to the exemplary embodiment, and FIG. 3 shows a schematic view of the power supply of the cooking appliance according to the invention according to the exemplary embodiment.In the following, an exemplary embodiment of a cooking appliance 1 is described in detail with reference to FIGS. 1 to 3. This is a commercial cooking appliance 1, designed as a combination damper, with which both steam cooking and hot air cooking are possible.Before the principles of the present invention are discussed in detail, it should be emphasized that, within the scope of this application, the term "cooking appliance" is understood to mean both commercial cooking appliances and household cooking appliances and, overall, very generally food treatment appliances which can carry out both cold and hot treatment of foods and can comprise, for example, hot air dampers, combi-dampers, beverage dispensing machines, beverage mixers, microwave appliances and other food treatment appliances.FIG. 1 shows purely schematically a front view of the cooking appliance 1. FIG. 2 shows a purely schematic side view of the cooking appliance 1. A cooking chamber 3 is formed in the housing 2. This cooking chamber 3 is closed by means of a door 4. The door 4 is hinged via door straps 5, so that the door can be opened and closed.Above the door 4 there is a man-machine interface, referred to below as MMS 6. This MMS 6 comprises a display 7, in particular designed as a touch display. Furthermore, the MMS 6 can have one or more light indicators 8 in order to represent states of the cooking appliance 1. It is also possible for the MMS 6 to comprise further buttons or switches which can be correspondingly actuated by the user in order to control the cooking appliance 1.In addition, the MMS 6 can be designed for voice control and accordingly comprise a microphone. It is further provided that the MMS 6 comprises at least one camera, for example, in order to detect which foods are inserted into the cooking appliance 1, and / or in order to monitor the cooking chamber 3, for example, in order to detect a cooking state of the foods or to detect a need for cleaning in the cooking chamber 3.Furthermore, the cooking appliance 1 comprises a heating device 9. this heating device 9 in turn comprises a plurality of heating elements 10 which heat the cooking chamber 3 when there is a corresponding current flow. The heating device 9 further comprises a main contactor 11 and a plurality of heating switches 12 located between the main contactor 11 and the heating elements 10. The heating switches 12 are shown in the schematic illustration in FIG. 3.The cooking appliance 1 further comprises a blower arrangement 13. this blower arrangement 13 comprises an electric motor 14 for driving a blower wheel 16.According to FIG. 2, a power supply unit 30 is located in the housing 2 of the cooking appliance 1, as has been explained in the general part of the description. Both the power supply unit 30 and the main contactor 11 of the heating device 9 can be connected to an AC voltage connection 100 via a connecting cable 17.FIG. 3 shows a schematic view of the power supply of the cooking appliance 1. the power supply unit 30 is shown with its power supply unit housing 42. an AC / DC converter 34 is located within this power supply unit housing 42 and is connected to the connecting cable 17. Further, the power supply 30 may include an EMC filter 31 and a power monitoring module 32. This power monitoring module 32 is connected to a power monitoring bus 33.The power monitoring bus 33 can in turn supply data to a further element of the cooking appliance 1, in particular to the MMS 6.In addition, the schematic illustration in FIG. 3 shows that the power supply unit 30 comprises a first load circuit connection 35, a second load circuit connection 36 and a blower load circuit connection 37. These connections 35, 36, 37 can be formed in or on the power supply unit housing 42. Furthermore, it is also possible for corresponding cables to lead out of the power supply unit housing 42 and for these cables to form the connections 35, 36, 37.Each connection 35, 36, 37 is preferably secured via its own fuse 38 of the power supply unit 30.The power supply unit 30, in particular in the power supply unit housing 42, comprises a first load circuit switch 39, a second load circuit switch 40 and a blower load circuit switch 41. the first load circuit connection 35 can be switched by means of the first load circuit switch 39. The second load circuit connection 36 can be connected by the second load circuit switch 40. The blower load circuit connection 37 can be switched by the blower load circuit switch 41.The switches 39, 40, 41 in the power supply unit 30 are in particular semiconductor relay switches or electromagnetic relay switches. These switches 39, 40, 41 can also comprise a corresponding switch logic which makes it possible to process one or more input signals accordingly and to switch them accordingly in dependence on one or more input signals.FIG. 3 also illustrates that a first load circuit 50, a second load circuit 51 and a blower load circuit 52 are present in the cooking appliance. The first load circuit 50 is connected to the first load circuit terminal 35. The second load circuit 51 is connected to the second load circuit terminal 36. The blower load circuit 52 is connected to the blower load circuit terminal 37.In the upper region of FIG. 3, a first consumer group 53 is shown. In this first consumer group 53, the MMS 6 and optionally further consumer elements 56 are located, as has been explained in the general part of the description.The first load group 53 is supplied with current primarily by means of the first load circuit 50. However, it may be necessary, for example on account of legal requirements, to arrange only loads having a maximum permissible total power in a load circuit. Therefore, in the context of the present invention, it is preferably provided to assign at least one consumer element 56 to a consumer subgroup 55. This load subgroup 55 is supplied with current via the second load circuit 51. This makes it possible to distribute the different loads, depending on the power, to the two load circuits 50, 51.A second load group 54 is also defined. This second consumer group 54 contains, in particular, consumers which are to be switched off when the door 4 is open, as has been explained in detail in the general part of the description. Accordingly, the heating switches 12 are located in this second load group 54; moreover, a circulation switch 57 can also be located in the second load group 54, as was explained in the general part of the description.Furthermore, the second consumer group 54 can also comprise further consumer elements 56.FIG. 3 also illustrates the structure of a door switch arrangement 60. this door switch arrangement 60 comprises, in the exemplary embodiment shown, a first door switch 61 and a second door switch 62. As the illustration in FIG. 1 shows, the second door switch 62 is located closer to the door strips 5.The door switch arrangement 60 comprises a door switch logic unit 63, for example designed as a simple logic link. In the exemplary embodiment shown, the two door switches 61, 62 are designed such that they permit a current flow in the activated state, i.e. when the door 4 is close enough to the respective door switch 61, 62 (in particular presses in the door switch 61, 62). Relevant in particular in the arrangement shown in FIG. 1 is the door switch 62, which is located closer to the door hinge 5. Only when the door 4 is opened far enough, in particular further than a gap of 50 mm, does the door switch arrangement 60 interrupt a power supply of the second load group 54 via the second load circuit 51.The first door switch 61 is relevant in particular in order to be able to change the stop side of the door 4. If the door stop is changed from the right-hand position shown (see FIG. 1 ) to the left-hand position, so that the door hinge belts 5 are on the left with respect to the illustration in FIG. 1, the first door switch 61 is relevant.The dashed line between the second consumer group 54 and the first consumer group 53 illustrates that the information about the position of the door 4, in particular "door open" and "door closed", can also be transmitted to consumers, in particular the MMS 6, of the first consumer group 53.Furthermore, a dashed line in FIG. 3 shows a connection of the door switch arrangement 60 to the blower load circuit switch 41. according to this schematic illustration, it is possible to switch the blower load circuit switch 41 as a function of the position of the door, as has been explained in the general part of the description.As already explained, the heating device 9 comprises the main contactor 11, the plurality of heating switches 12 and the plurality of heating elements 10. FIG. 3 shows, purely schematically at the bottom left, the heating switches 12 between the main contactor 11 and the heating elements 10.FIG. 3 further illustrates a safety circuit 70 having one or more safety temperature limiter(s) 71. By means of the safety circuit 70, a main contactor switch 72 can be switched in the main contactor 11 in order to disconnect the heating device from the AC voltage connection 100. In particular, the second load circuit switch 40 and / or the blower load circuit switch are also connected to 41 the safety circuit 70, so that these two switches 40, 41 can likewise be switched off when the main contactor switch 72 is switched off.FIGS. 1 and 3 also show a device switch 80 which, according to the illustration in FIG. 1, is located on the front side of the cooking device 1. The equipment switch 80 is connected to the first load circuit switch 39, the second load circuit switch 40 and the blower load circuit switch 41 and can selectively switch these switches 39, 40, 41 as explained in the general part of the description.It is understood that the power supply unit 30 shown can have further load circuits. Thus, in particular, the second load circuit 51 with the associated second load circuit switch 40 is representative of further load circuits and further load circuit switches.In addition to the above written description of the invention, for the purpose of supplementary disclosure thereof, reference is hereby made explicitly to the graphical representation of the invention in all figures.List of reference characters1 Cooking appliance 2 Housing 3 Cooking chamber 4 Door 5 Door strips 6 Human-machine interface (MMS) 7 Display 8 Illuminated indicators 9 Heating device 10 Heating elements 11 Main contactor 12 Heating switch 13 Blower arrangement 14 Electric motor 15 Motor electronics 16 Blower wheel 17 Connecting cable 30 Power supply unit 31 EMC filter 32 Power monitoring module 33 Power monitoring bus 34 AC / DC converter 35 First load circuit connection 36 Second load circuit connection 37 Blower load circuit connection 38 Fuses 39 First load circuit switch 40 Second load circuit switch 41 Blower load circuit switch 42 Power supply unit housing 50 First load circuit 51 Second load circuit 52 Blower load circuit 53 First load group 54 Second load group 55 load subgroup 56 load elements 57 circulation switch 60 door switch arrangement 61 first door switch 62 second door switch 63 door switch logic unit 70 safety circuit 71 safety temperature limiter 72 main contactor switch 80 device switch 100 AC voltage connection

Claims

Cooking appliance (1), in particular a commercial cooking appliance, comprising • a housing (2), • a cooking chamber (3) in the housing (2) and a door (4) for closing the cooking chamber (3), • a heating device (9) for heating the cooking chamber (3), • a first consumer group (53) which is arranged for the supply of power in a first load circuit (50), wherein a plurality of consumers are located in the first consumer group (53), • a blower arrangement (13) with an electric motor (14) for generating circulating air in the cooking chamber (3), wherein the blower arrangement (13) is arranged for the supply of power in a blower load circuit (52), • and a power supply unit (30), wherein the first load circuit (50) is connected to a first load circuit connection (35) of the power supply unit (30) and wherein the fan load circuit (52) is connected to a fan load circuit connection (37) of the power supply unit (30), wherein the power supply unit (30) comprises a first load circuit switch (39) for switching the first load circuit (50) and a fan load circuit switch (41) for switching the fan load circuit (52), wherein the first load circuit (50) and / or the fan load circuit (52) are DC load circuits.Cooking appliance according to claim 1, • wherein the first load circuit connection (35) and the blower load circuit connection (37), preferably all outgoing connections of the power supply unit, are designed for DC voltage load circuits, • and / or wherein the power supply unit (30) is designed on the input side for connection to an AC voltage power supply unit, • and / or wherein the electric motor (14) of the blower arrangement (13) is a DC motor.Cooking appliance according to one of the preceding claims, wherein the cooking appliance (1) comprises a door switch arrangement (60) which is designed to detect a position of the door (4), wherein the door switch arrangement (60) is connected to the blower load circuit switch (41) in order to switch the blower load circuit (52) as a function of the position of the door (4).Cooking appliance according to claim 3, wherein the door switch arrangement (60) comprises at least a first door switch (61) and a second door switch (62), wherein the two door switches (61, 62) are actuatable by opening and / or closing the door (4); in particular wherein one of the door switches is arranged closer to a hinge (5) than the other door switch.Cooking appliance according to one of the preceding claims, comprising a second load group (54) which is arranged for supplying power in a second load circuit (51), wherein the second load circuit (51) is connected to a second load circuit connection (36) of the power supply unit (30), and wherein the power supply unit (30) comprises a second load circuit switch (40) for switching the second load circuit (51).Cooking appliance according to claims 3 and 5, wherein the door switch arrangement (60) is arranged between the second load circuit connection (36) and the second load group (54), wherein the door switch arrangement (60) is designed to switch off the second load group (54) depending on the detected position of the door (4).Cooking appliance according to claim 5 or 6, comprising a circulation switch (57) for switching a circulation of a cleaning fluid passing through the cooking chamber (3), wherein the circulation switch (57) is in the second consumer group (54).Cooking appliance according to one of claims 5 to 7, wherein the heating device (9) can be switched via at least one heating switch (12), wherein the at least one heating switch (12) is in the second consumer group (54); in particular wherein the at least one heating switch (12) switches off the heating device (9) in the non-energized state.Cooking appliance according to one of the preceding claims, wherein the heating device (9) is designed as an electrical heating device, in particular as an electrical resistance heating device, which can be connected via a main contactor (11), in particular arranged outside the power supply unit (30).Cooking appliance according to claim 9 - and according to claim 5, if the second load circuit (51) can be disconnected by means of the second load circuit switch (40)-, wherein the main contactor (11) can be disconnected via a safety circuit (70) with safety temperature limiter (71); in particular wherein the power supply unit (30) is connected to the safety circuit (70) and is designed to disconnect the fan load circuit (52) by means of the fan load circuit switch (41) and / or the second load circuit (51) by means of the second load circuit switch (40) when the main contactor (11) is disconnected.Cooking appliance according to claim 10, wherein the safety circuit (70) is supplied with current via the first load circuit (50).Cooking appliance according to one of the preceding claims - including claim 5, if the appliance switch (80) for switching the second load circuit switch (40) is connected to the second load circuit switch (40) - comprising an appliance switch (80) which is arranged in particular for actuation by a user, wherein the appliance switch (80) • is connected to the first load circuit switch (39) for switching the first load circuit switch (39), • and / or is connected to the second load circuit switch (40) for switching the second load circuit switch (40), • and / or is connected to the blower load circuit switch (41) for switching the blower load circuit switch (41).

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