Method for controlling an energy supply of a lift

Abstract

The invention relates to a method for controlling an energy supply of a lift (1) comprising a power module (15) for supplying the lift (1) with electrical energy from a mains system (19) and / or a battery (20) and for charging the battery (2), wherein, when it is established that the lift is in an inactive state, in which less electrical energy is drawn from the battery (20) than in an active state of the lift (1), the method involves: adapting at least one charging parameter (P) for charging the battery (20) to the inactive state; generating a control command (26) for controlling the power module (15) such that the battery (20) is charged at least in some phases according to the at least one charging parameter (P) adapted to the inactive state.

Description

1. FIELD OF THE INVENTION The present invention relates to a method for controlling an energy supply of an elevator. 5 Furthermore, the invention relates to an elevator and to an energy supply system for an elevator, as well as to a control unit, a computer program, and a computer-readable medium for carrying out the method. 2. BACKGROUND OF THE INVENTION 10 An elevator used to transport people and / or objects between different landings of a building can be switched to an energy-saving mode (standby), in which the elevator consumes significantly less electrical energy than in a normal operating mode, during periods of prolonged inactivity. For this purpose, specific electrical components of the elevator can be temporarily deactivated, for example by disconnecting them from the 15 mains network. The remaining, non-deactivated components of the elevator, such as control electronics, can then, for example, continue to be supplied with electrical energy via the mains network. When providing the supply voltage required to power these components from the mains network (for example, when converting an alternating voltage as mains voltage into a direct voltage as supply voltage), greater losses can occur 20 due to the reduced energy consumption of the elevator compared to normal operating mode, which correspondingly reduces the energy efficiency of the elevator in energysaving mode. There may therefore be a need for an improved method for controlling an energy supply 25 of an elevator in the inactive state. Furthermore, there may be a need for a corresponding control unit, a corresponding computer program, a corresponding computer-readable medium, a corresponding energy supply system, and a corresponding elevator. 3. SUMMARY OF THE INVENTION 30 A first aspect of the invention provides a computer-implemented method for controlling an energy supply of an elevator. The elevator comprises a power module that is configured to supply the elevator with electrical energy from a mains network and / or a battery and to charge the battery. For this purpose, the power module can for example comprise a corresponding charger. The method comprises, when it is detected that the 2023313309   25 Jun 2026 elevator is in an inactive state in which less electrical energy is drawn from the battery than in an active state of the elevator: adapting at least one charging parameter for charging the battery to the inactive state, more precisely to the reduced energy draw from the battery; generating a control command for controlling the power module so that the 5 battery is charged at least in phases in accordance with the at least one charging parameter adapted to the inactive state. When the elevator is in the active state, for example when one or more elevator cars are being moved, significantly more power is usually drawn from the battery than in the 10 inactive state, in particular to absorb power peaks that could not be absorbed by the mains network alone. Charging the battery may be subject to certain limitations that may affect charging efficiency and / or battery service life. It is therefore proposed to charge the battery in the inactive state of the elevator, for example when the elevator is stationary for a long period of time, in an optimized charging mode that is specifically adapted to this 15 state. This allows for a particularly efficient and / or protective charging of the battery. As mentioned at the beginning, the inactive state can be detected, for example, when the elevator has not been used for a specific period of time. In principle, the elevator can be operated in the inactive state in such a way that it consumes significantly less electrical 20 energy than in the active state, for example a normal operating mode. The battery can be a rechargeable battery, for example in the form of a lithium-ion or lithium-iron-phosphate accumulator. The battery can comprise a plurality of galvanic cells which can be connected to one another in series and / or in parallel. The battery can, 25 for example, have an output voltage of at most 120 V, in particular at most 60 V, preferably 48 V. However, higher DC voltages are also possible as the output voltage. The battery can, for example, have an output voltage of at least 12 V, in particular at least 24 V. The capacity of the battery can, for example, be between 1 Ah and 10 Ah, in particular between 7 Ah and 8 Ah. In other words, the battery can have a capacity of more 30 than 0.1 kWh, more than 0.2 kWh, more than 0.5 kWh, or even more than 1 kWh. However, larger capacities are also possible. The mains network can be an alternating voltage and / or alternating current source. The alternating voltage or current can be single-phase or multi-phase, in particular three- 2023313309   25 Jun 2026 phase. The mains network can, for example, be a low-voltage mains network with a mains voltage between 200 V and 1000 V, in particular 230 V. The power module can be configured to convert a mains voltage provided by the mains 5 network, a battery voltage provided by the battery, or a combination of both voltages into a supply voltage for one or more electrical consumers of the elevator. The supply voltage can in particular be a direct voltage, in particular in the low-voltage range up to 120 volts (see below). The power module can provide either the same supply voltage or different supply voltages for different consumers. 10 For this purpose, the power module can be equipped with an inverter, rectifier, converter, DC-DC converter, brake chopper, or a combination of at least two of these examples. Furthermore, the power module can be configured to charge the battery in a controlled 15 manner and, optionally, to discharge it in a controlled manner. The power module can comprise hardware and / or software modules for controlling the energy supply of the elevator. For example, different control modes for controlling the energy supply can be implemented by different hardware and / or software modules of the 20       power module. The charging parameter can be, for example, a charging power, a charging voltage, a charging current, a charging duration, or a parameter dependent on at least one of these examples. The term “at least one charging parameter” can also be understood as a 25        combination of a plurality of charging parameters in the form of a charging profile. The method can be carried out automatically by a processor. A second aspect of the invention provides an elevator control unit with a processor that is 30 configured to carry out instructions to perform the method described above and below. The elevator control unit has an interface for receiving elevator call data and for sending switching commands for switching electrical components of an elevator. The control unit can comprise hardware and / or software modules. In addition to the processor, the control unit can comprise a memory and data communication interfaces for wireless and / or wired 2023313309   25 Jun 2026 data communication with peripheral devices. The elevator control unit, is electrically connectable or connected to elevator components via the interface. Lift components that send elevator call data to the control unit or elevator control unit via the interface include, for example, landing operating panels (LOP), car operating panels (COP), destination call 5 controls or mobile phones (for example connected to the control unit or elevator control via GSM or Bluetooth) with a corresponding app. Lift components for switching include, for example, car and / or shaft lighting, an electric car drive for moving at least one car of the elevator, an electric door drive for moving at least one car door and / or shaft door of the elevator, a sensor, for example a light barrier or a load- or distance-measuring device. 10 A third aspect of the invention provides an energy supply system for an elevator. The energy supply system comprises: a mains connection for connecting the energy supply system to a mains network; a battery connection for connecting the energy supply system to a battery; a power module that is configured to supply the elevator with electrical 15 energy from the mains network and / or the battery and to charge the battery; the control unit described above and below. A fourth aspect of the invention provides an elevator that comprises: a car that can be moved in a shaft between multiple landings of a building; an electric drive for driving the 20 car; a battery; the energy supply system described above and below. Preferably, the elevator further comprises at least one electrical component from the list comprising: a car and / or shaft lighting, an electric car drive for moving at least one car of the elevator, an electric door drive for moving at least one car door and / or shaft door of the elevator, a sensor, for example a light barrier or a load- or distance-measuring device. 25 It is possible for the elevator to be supplied directly, i.e., without additional rectification and / or without additional DC voltage conversion, with a battery voltage applied to the battery terminals. 30 The electric drive can comprise one, two, or more than two electric motors to drive the car. For example, each electric motor can be coupled with its own counterweight. Further aspects of the invention relate to a computer program and a non-transitory computer-readable medium on which the computer program is stored. 2023313309   25 Jun 2026 The computer program comprises commands which cause an elevator control unit as described above and below to carry out the method steps of the method described above and below. 5 The computer-readable medium can be a non-volatile data memory. For example, the computer-readable medium can be a hard disk, a USB storage device, a RAM, a ROM, an EPROM, a flash memory, or a combination of at least two of these examples. The computer-readable medium can also comprise a data communication network that allows 10 a program code to be downloaded from a remote storage facility, such as the Internet or a cloud. Features of the method described above and below can also be features of the control unit, of the computer program, and / or of the computer-readable medium, and vice versa. 15 Embodiments of the invention can be regarded, without limiting the invention, as being based upon the ideas and findings described below. According to one embodiment, the at least one charging parameter can be adapted using a 20 first characteristic curve that describes a relationship between the at least one charging parameter and an efficiency when charging the battery. In other words, the at least one charging parameter can be optimized taking into account a desired efficiency to be achieved when charging the battery. “Efficiency” can be understood as the efficiency of a charger for charging the battery, an efficiency of the battery being charged, or an overall 25 efficiency when charging the battery. According to one embodiment, the at least one charging parameter can be adapted using a second characteristic curve that describes a relationship between the at least one charging parameter and a service life of the battery. In other words, at least one charging parameter can 30 be optimized taking into account a desired service life that the battery is intended to achieve. The first and / or second characteristic curve can be stored in a memory of the control unit, for example in the form of a look-up table and / or a mathematical function. It is also possible to optimize the minimum charging parameters outside the control unit, i.e., 2023313309   25 Jun 2026 offline. In this case, for example different optimized charging parameters or charging profiles for charging the battery in different states of the elevator, including the active and inactive states, can be stored in the memory. 5 According to one embodiment, the efficiency and the service life can be weighted differently when adapting the at least one charging parameter. For example, the service life can be weighted more heavily than the efficiency. In this way, the charging parameters can be optimized so that the battery is charged as protectively as possible when in the inactive state. But the opposite case is also conceivable. Alternatively, both 10 criteria can be given equal weight. According to one embodiment, the at least one charging parameter can be a charging power. This makes it possible for the charging process to be optimized in a particularly simple manner. For example, the battery can be charged in the inactive state with a 15 significantly lower (average) charging power, e.g. more than 10%, more than 30%, more than 50%, more than 70% or more than 90% lower than in the active state. According to one embodiment, the control command can be generated to control the power module in such a way that the battery is alternately charged and discharged in a 20 plurality of charging and discharging phases. For example, the elevator can be disconnected from the mains network during each discharging phase and supplied with electrical energy via the battery. Repeated charging and discharging can prevent the battery from becoming over-discharged when the 25 elevator is in the inactive state for a long period of time. This can have a positive effect on the service life of the battery. For example, the battery can be charged with electrical energy from the mains network during each charging phase. The energy required to charge the battery can theoretically 30 also be provided by a drive motor of the elevator, operated as a generator. In principle, the parameters defining the charging and discharging phases should be coordinated in such a way that a good compromise is achieved between energy efficiency and battery protection. 2023313309   25 Jun 2026 This avoids conversion losses that can occur in designs in which the supply voltage in the inactive state is provided exclusively via the mains network (usually an AC network). Such losses are usually greater than those that occur when the supply voltage is provided 5 by a battery, in particular if the supply voltage is a (relatively low) direct voltage. In other words, it has been recognized that when an elevator is operated in a particularly energysaving standby mode, it has only a low power consumption of, for example, less than 100 W or less than 50 W, and that the provision of such low power via the mains network is often accompanied by considerable losses, in particular conversion losses. It is 10 therefore proposed to equip the elevator with a battery and to use the battery, among other things, to supply the elevator with electrical energy at least at times during standby phases. The battery can be charged in advance and / or in between in short charging phases with high power, so that relatively low conversion losses occur. The electrical energy stored in the battery during such efficient charging can then be used with high efficiency 15 during discharging to supply the elevator with low power in standby mode. The energy efficiency of the elevator can be improved in this way. According to one embodiment, the power supplied to the battery in each charging phase is 10 to 100 times, in particular 10 to 50 times, greater than the power drawn from the 20 battery in each discharging phase. This allows for an improvement in efficiency compared to designs with lower energy conversion in the charging phases. According to one embodiment, the state of charge of the battery at the end of each charging phase can be between 65% and 100%, in particular between 70% and 90%. This 25 has a positive effect on the battery service life. According to one embodiment, the state of charge of the battery at the end of each discharging phase can be between 30% and 50%, in particular between 35% and 45%. This also has a positive effect on the battery service life. Furthermore, at the end of each 30 discharging phase, the battery thus still has enough capacity to allow for emergency operation of the elevator, in particular if the energy supply to the elevator via the mains network is disrupted. 2023313309   25 Jun 2026 According to one embodiment, each discharging phase can last at least 20 times, in particular at least 50 times, longer than each charging phase. Such values have proven to be particularly positive in tests. 5 For example, each charging phase can last less than 15 minutes, in particular less than 10 minutes. In tests, charging phases of 6 minutes each proved to be particularly suitable for practical use. On the other hand, each discharging phase can last, for example, more than 1 hour, in particular more than 2 hours. In tests, discharging phases of 3 hours each have proved to be particularly suitable for practical use. 10 According to one embodiment, a power level between 30 W and 60 W can be supplied to the elevator in each discharging phase. In other words, a power level of between 30 W and 60 W can be drawn from the battery in each discharging phase. This power can for example correspond to the maximum power that the elevator can absorb in the inactive 15 state during each discharging phase in order to meet specific energy efficiency standards. In particular, this power should not be higher than 50 W. According to one embodiment, a power level of between 700 W and 1000 W can be supplied to the battery in each charging phase. In other words, a power of between 700 W 20 and 1000 W can be drawn from the mains network during each charging phase. For example, an energy level of at least 70 Wh, in particular at least 90 Wh, e.g., 95 Wh, can be converted in each charging phase. 25 According to one embodiment, the control command can further be generated to disconnect the battery and / or the power module from the mains network at least in phases. For example, the battery and / or power module can be disconnected from the mains network during each discharging phase. 30 According to one embodiment, the method can further comprise, when it is detected that the elevator is in the inactive state: switching at least one electrical component of the elevator from a current state to an energy-saving state in which the at least one electrical component consumes less electrical energy than in the current state. 2023313309   25 Jun 2026 For this purpose, the electrical component can be switched off at least at times, for example by disconnecting it from an output of the power module. Alternatively or additionally, the electrical component can remain switched on at least at times in the energy-saving state, wherein the power module supplies the electrical component with a 5 lower input power than in the current state. The at least one electrical component can, for example, be at least one of the following components: a car and / or shaft lighting, an electric car drive for moving at least one car of the elevator, an electric door drive for moving at least one car door and / or shaft door of 10 the elevator, a sensor, for example a light barrier or a load- or distance-measuring device. This means that the energy consumption of the elevator can be further reduced in the inactive state. In addition, such standby operation has a positive effect on the service life of the battery, as less electrical energy is then drawn from the battery. 15 According to one embodiment, the method can further comprise, when it is detected that the elevator is in the active state again: adapting the at least one charging parameter to the active state; generating a further control command for controlling the power module so that the battery is charged at least in phases in accordance with the at least one charging 20 parameter adapted to the active state. In other words, in the active state of the elevator the battery can be charged using a different charging mode than in the inactive state of the elevator. For example, the at least one charging parameter adapted to the active state can have been optimized to achieve the highest possible efficiency in contrast to the inactive state (see also above). 25 The active state can be detected, for example, when a new destination call is registered and / or a car door and / or shaft door of the elevator is to be opened. The active state can, for example, correspond to a normal operating mode, i.e. a (fault-free) travel operation of the elevator. The combined use of the mains network and battery allows peak loads to be 30 better absorbed. The battery can also be used to provide emergency power to the elevator in the event of malfunctions, such as a disturbance of the (normal) energy supply via the mains network. 2023313309   25 Jun 2026 According to one embodiment, the power module can be configured to provide an output voltage of the battery as a supply voltage for supplying the elevator with electrical energy. The supply voltage can, for example, be a direct voltage of at least 12 V and at most 120 V, in particular at most 60 V, preferably 48 V (see also above). Such supply voltages in the 5         low-voltage range allow for particularly energy-saving operation of the elevator. In other words, the output voltage of the battery can be used as the supply voltage without additional conversion. This improves the efficiency of the elevator compared to designs in which the supply voltage is provided only by converting the battery voltage, for 10 example by changing its voltage level, as this causes additional losses. Illustrative embodiments of the invention are schematically shown in the accompanying drawings and will be described below with reference to the accompanying drawings. Neither the description nor the drawings are to be understood as limiting the invention. 15 4. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 shows an elevator according to one embodiment of the invention. Fig. 2 shows a sequence of charging and discharging phases for charging or discharging a 20 battery of the elevator in a method according to an embodiment of the invention. Fig. 3 shows a first characteristic curve for use in a method according to an embodiment of the invention. 25 Fig. 4 shows a second characteristic curve for use in a method according to an embodiment of the invention. The drawings are merely schematic and are not to scale. The same reference signs in different drawings indicate the same or equivalent features. 30 5. DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS Fig. 1 shows an elevator 1 for transporting persons and / or objects between a plurality of landings 3 of a building 5. For this purpose, the elevator 1 comprises a car 7, which is 2023313309   25 Jun 2026 arranged to be movable in a vertical shaft 9 of the building 5, and an electric drive 13, which is designed to raise and lower the car 7. The supply of the elevator 1 with electrical energy is ensured by an energy supply 5 system 14 which comprises a power module 15, a battery connection 16, a mains connection 17 and a control unit 18. The power module 15 is connected at the input side via the mains connection 17 to a mains network 19, for example a three-phase network, and via the battery connection 16 to a rechargeable battery 20, and at the output side to the electric drive 13 and to other electrical consumers of the elevator 1 (not shown), for 10 example to a car or shaft lighting, an electric door drive for opening or closing car doors and / or shaft doors, light barriers in the door area of the car 7 and / or the landings 3 or a load-measuring device for measuring a load of the car 7. The power module 15 can be configured to supply specific electrical consumers of the 15 elevator 1 selectively with electrical energy either from the mains network 19 or the battery 20 or simultaneously from both energy sources. In addition, the power module 15 can be configured to charge the battery 20 with electrical energy from the mains network 19. It is also possible to charge the battery 20 by recuperation if the electric drive 13 is used to decelerate the car 7, i.e., as a generator. 20 The control unit 18 controls the power module 15. For example, the control unit 18 can be configured to control the power module 15 so that the electric drive 13 accelerates or decelerates the car 7. 25 The control unit 18 can switch the elevator 1 from a current operating mode to an energysaving mode if it detects that the elevator 1 has not been used for a specific period of time. This can be the case, for example, if all outstanding destination calls have been processed and all doors of the car 7 and / or of the shaft 9 are closed. 30 In the energy-saving mode, electrical consumers that consume particularly large amounts of power, such as the electric drive 13, can be temporarily deactivated, i.e., disconnected from the output of the power module 15 or operated with reduced input power. In particular, the entire elevator 1 can be deactivated with the exception of its control electronics (which can comprise the control unit 18 and the power module 15). In this 2023313309   25 Jun 2026 way, the energy consumption of the elevator 1 can be drastically reduced. The energy supply of the deactivated and / or non-deactivated consumers can then be provided via the battery 20. 5 The control unit 18 comprises a memory 23 in which a computer program is stored and a processor 25 which is configured to carry out the method for controlling the energy supply of the elevator 1 described below by executing the computer program. In this example, when the control unit 18 detects that the elevator 1 is to be operated in 10        energy-saving mode, it generates a control command 26 which causes the power module 15 to alternately charge and discharge the battery 20 in a specific sequence of charging phases 27 and discharging phases 29 (see also Fig. 2). For example, the battery 20 can be connected to the mains network 19 during the 15 charging phases 27, wherein the remaining consumers of the elevator 1 can be disconnected from the mains network 19 and supplied with power via the battery 20. During the discharging phases 29, in contrast, the elevator 1 is supplied with power exclusively via the battery 20. 20 The power module 15 can be configured to supply the elevator 1 with the same supply voltage in the various charging phases 27 and discharging phases 29. This can be a direct voltage in the low-voltage range up to 120 V, for example 48 V. However, it is also possible to use an alternating voltage as the supply voltage. 25 The supply voltage can be equal to, or substantially equal to, a battery voltage present at the connection terminals of the battery 20. This eliminates the need for additional voltage conversion, which further improves the energy efficiency of the elevator 1. As can be seen in Fig. 2, the charging phases 27 and the discharging phases 29 can be 30 constant, for example characterized by a constant length and / or constant charging or discharging power (the ordinate of the diagram shown in Fig. 2 indicates the power or energy absorbed or emitted by the battery 20). However, it is also possible for the charging and / or discharging phases to vary in their properties over time. 2023313309   25 Jun 2026 As mentioned above, the control unit 18 can also be configured to generate a deactivation command 30 which causes one or more of the above-mentioned electrical consumers of the elevator 1 to remain disconnected from the mains network 19 and, in addition, from the battery 20 as long as the elevator 1 is operated in energy-saving mode. 5 It is possible for the control unit 18 to switch the elevator 1 back to the normal operating mode as soon as a new destination call is received or a door of the car 7 and / or of the shaft 9 is opened. For this purpose, the control unit 18 generates a further control command 31, which causes the power module 15 to supply the elevator 1 with electrical 10 energy mainly via the mains network 19, possibly supported by the battery 20 in order to absorb peak loads. In the following, the energy consumption of elevator 1 in the energy-saving mode is calculated as an example. The sequence of charging phases 27 and discharging phases 29 15 extends over a period of approximately 24 hours. If the elevator 1 consumes a required power of 40 W in a discharging phase 29 of 3 hours, an energy of 120 Wh is drawn from the battery 20. At the end of the discharging phase 29, the battery 20 has a state of charge (SOC) of 30%. In a subsequent charging 20 phase 27 of 6 minutes, the battery 20 is charged with a charging power of 15 A x 48 V = 720 W until a state of charge of 90% is reached. Adding the required power of 40 W, at an efficiency of 80% there results in a total power of 950 W, which corresponds to an energy consumption of 95 Wh. 25 For example, the battery 20 can be charged and discharged according to the following sequence. Here “R” stands for a six-minute charging phase 27 and “D” stands for a one-hour discharging phase 29: R D D D R D D D R D D D R D D D R D D D R D D D R D D D R D D R 30 The total energy consumption of the elevator 1 during the charging phases is therefore 95 Wh x 9 = 855 Wh. 2023313309   25 Jun 2026 The total energy consumption of the elevator 1 during the discharging phases is therefore 40 W x 23 h = 920 Wh. In the charging phases 27, the battery 20 can be charged with one or more charging 5 parameters specifically adapted to the energy-saving mode, here a charging power P. The charging power P can be optimized for example using a first characteristic curve 33 (see Fig. 3), which indicates a relationship between P and an efficiency n when charging, and a second characteristic curve 35 (see Fig. 4), which indicates a relationship between P 10 and a service life L of the battery 20. In this example, the efficiency n increases as the charging power P increases, whereas the service life L becomes shorter with increasing charging power P (the two characteristic curves 33, 35 are thus to some extent in opposite directions). 15 When optimizing P, the two criteria of efficiency and service life can be weighted equally or differently. It is possible that different sets of charging parameters, i.e., different charging profiles or 20 modes, are determined for the active and inactive states of the elevator 1. For example, the further control command 31 can be generated in this case in order to further charge the battery 20 in the active state, i.e., in the normal operating mode, with a set of charging parameters specifically adapted to this state. 25 Finally, it should be noted that terms such as “having,” “comprising,” “including,” “with,” etc. do not exclude other elements or steps, and indefinite articles such as “a” or “an” do not exclude a plurality. Furthermore, it should be noted that features or steps described with reference to one of the above embodiments can also be used in combination with features or steps described with reference to other of the above 30 embodiments. Reference signs in the claims should not be considered to be limiting.

Claims

1. A computer-implemented method for controlling an energy supply of an elevator,wherein the elevator comprises a power module for supplying the elevator with electrical5 energy from one or both a mains network and a battery, wherein the power module is adapted to charge the battery, the method comprising:when it is detected that the elevator is in an inactive state in which less electrical energy is drawn from the battery than in an active state of the elevator:- adapting at least one charging parameter for charging the battery to the10                      inactive state; and- generating a control command for controlling the power module so that the battery is charged at least in phases in accordance with the at least one charging parameter adapted to the inactive state.15        2. The method according to claim 1, wherein the at least one charging parameter isadapted by one or both of:- using a first characteristic curve that describes a relationship between the at least one charging parameter and an efficiency when charging the battery, and- using a second characteristic curve that describes a relationship between the20                      at least one charging parameter and a service life of the battery.

3. The method according to claim 2, wherein the efficiency and the service life are weighted differently when adapting the at least one charging parameter.25        4. The method according to any one of the preceding claims, wherein the at leastone charging parameter is a charging power.

5. The method according to any one of the preceding claims, wherein the control command is generated to alternately charge and discharge the battery in a plurality of30 charging phases and discharging phases.

6. The method according to claim 5, wherein the battery at the end of each charging phase has a state of charge between 65% and 100%, or between 70% and 90%.2023313309   25 Jun 20267. The method according to claim 5 or 6, wherein the battery at the end of each discharging phase has a state of charge between 30% and 50%, or between 35% and 45%,.5        8. The method according to any one of the preceding claims, wherein the controlcommand is further generated to disconnect one or both the battery and the power module from the mains network at least in phases.

9. The method according to any one of the preceding claims, further comprising,10 when it is detected that the elevator is in the inactive state:- switching at least one electrical component of the elevator from a current state to an energy-saving state in which the at least one electrical component consumes less electrical energy than in the current state.15        10. The method according to any one of the preceding claims, further comprising:when it is detected that the elevator is again in the active state:-      adapting the at least one charging parameter to the active state; and-      generating a further control command for controlling the power moduleso that the battery is charged at least in phases in accordance with the at least one20 charging parameter adapted to the active state.

11. An elevator control unit, comprising:- an interface adapted for receiving elevator call data and for sending switching commands for switching an electrical component of an elevator, and25                - a processor in communication with the interface and configured to carry out themethod according to any of the preceding claims.

12. An energy supply system for an elevator, the energy supply system comprising: - a mains connection for connecting the energy supply system to a mains30        network;- a battery connection for connecting the energy supply system to a battery;- a power module for supplying the elevator with electrical energy from one or both the mains network and the battery, wherein the power module is configured to charge the battery; and2023313309   25 Jun 20261015an elevator control unit according to claim 10.

13. The energy supply system according to claim 12, wherein the power module is configured to provide an output voltage of the battery as a supply voltage for supplyingthe elevator with electrical energy.

14. An elevator, comprising:- an elevator car movable in an elevator shaft between a plurality of landings in a building;- an electrical drive for moving the elevator car;- a battery; and- an energy supply system according to claim 12 or 13 connected via its battery connection to the battery.

15. The elevator according to claim 14, further comprising:at least one electrical component from the list comprising a car lighting, a shaft lighting, an electric door drive for moving at least one elevator car door, an electric door drive for moving at least one shaft door of the elevator, a sensor, a light barrier, a loadmeasuring device and a distance-measuring device.2016.    A non-transitory computer-readable medium storing a computer programcomprising commands that cause an elevator control unit according to claim 11 to carry out the method according to any one of claims 1 to 10.

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