Method for controlling power supply of elevator

Abstract

A method for controlling the power supply of an elevator (1), the elevator comprising a power module (15) for providing electrical energy to the elevator (1) from an electrical grid (19) and / or a battery (20) and charging the battery (2), the method comprising: when it is identified that the elevator (1) is in an inactive state, taking less electrical energy from the battery (20) than in an active state of the elevator (1); adapting at least one charging parameter (P) for charging the battery (20) to the inactive state; a control command (26) for actuating the power module (15) is generated in such a way that the battery (20) is charged at least in stages as a function of at least one charging parameter (P) adapted to the inactive state.

Description

Technical Field

[0001] The invention relates to a method of controlling the power supply of an elevator. Furthermore, the invention relates to an elevator and a power supply system for an elevator as well as a control unit, a computer program and a computer-readable medium for executing the method. Background Art

[0002] During longer periods of inactivity, elevators for transporting people and / or objects between different floors of a building can be switched to an energy-saving mode (stand-by), in which the elevator consumes less electrical energy than in normal operating mode. To this end, certain electrical components of the elevator can be temporarily deactivated, for example by disconnecting them from the power grid. The remaining components of the elevator that are not deactivated (e.g., control electronics) can then, for example, continue to be supplied with electrical energy via the power grid. When the supply voltage required to power these components is provided from the power grid (e.g., when converting an AC voltage as the power grid voltage into a DC voltage as the supply voltage), greater losses may occur due to the reduced energy consumption of the elevator compared to normal operating mode, which correspondingly reduces the energy efficiency of the elevator in energy-saving mode. Summary of the invention

[0003] Therefore, there is a need for an improved method for controlling the power supply of an elevator in an inactive state. In addition, there is also a need for a corresponding control unit, a corresponding computer program, a corresponding computer-readable medium, a corresponding power supply system and a corresponding elevator.

[0004] These needs are met by the subject matter of the independent claims. Advantageous embodiments are set forth in the dependent claims, the subsequent description and the drawings.

[0005] A first aspect of the invention relates to a computer-implemented method for controlling the power supply of an elevator. The elevator comprises a power module, which is configured to provide the elevator with electrical energy from a power grid and / or a battery and to charge the battery. To this end, the power module can, for example, comprise a corresponding charging device. The method comprises: when it is recognized that the elevator is in an inactive state, in which less electrical energy is obtained from the battery than in the 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 extraction from the battery; generating control instructions for operating the power module so that the battery is charged at least in stages according to at least one charging parameter adapted to the inactive state.

[0006] In the active state of the elevator, for example when one or more cars of the elevator are moving, the battery usually consumes more power than in the inactive state, in particular to absorb power peaks that the power grid cannot absorb alone. The charging of the battery may be subject to certain limitations, which affect the charging efficiency and / or the service life of the battery. It is therefore recommended to charge the battery in the inactive state of the elevator (for example when the elevator is stationary for a long time) using an optimized charging mode specially adapted to this situation. This makes the charging of the battery particularly efficient and / or economical.

[0007] As mentioned at the outset, an inactive state can be detected, for example, when the elevator has not been used for a certain period of time. In principle, the elevator can be operated in the inactive state in such a way that it consumes significantly less electrical energy than in the active state (eg normal operating mode).

[0008] The battery can be a rechargeable battery, for example in the form of a lithium-ion or lithium iron phosphate battery. The battery can include a plurality of battery packs that can be connected in series and / or in parallel. The output voltage of the battery can be, for example, not higher than 120V, in particular not more than 60V, preferably 48V. However, a higher DC voltage is also possible as the output voltage. The battery can, for example, have an output voltage of at least 12V, in particular at least 24V. The capacity of the battery can, for example, be between 1Ah and 10Ah, in particular between 7Ah and 8Ah. In other words, the capacity of the battery can be higher than 0.1kWh, higher than 0.2kWh, higher than 0.5kWh or even higher than 1kWh. However, higher capacities are also feasible.

[0009] The power grid can be an AC voltage source and / or an AC current source. The AC voltage or AC current can be single-phase or multi-phase, in particular three-phase. The power grid can be, for example, a low-voltage power grid with a grid voltage between 200V and 1000V, in particular 230V.

[0010] The power module can be configured to convert a mains voltage provided by the mains, 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 be in particular a DC voltage, in particular a DC voltage in the low voltage range of up to 120 volts (see below). In this case, the power module can provide the same supply voltage for different electrical consumers, or different supply voltages.

[0011] To this end, the power module can be equipped with an inverter, a rectifier, a converter, a DC converter, a brake chopper or a combination of at least two thereof.

[0012] Furthermore, the power module may be configured to charge the battery in a controlled manner, and optionally discharge the battery in a controlled manner.

[0013] The power module may include hardware and / or software modules for controlling the power supply of the elevator. For example, different control modes for controlling the power supply can be implemented through different hardware and / or software modules of the power module.

[0014] The charging parameter may be, for example, charging power, charging voltage, charging current, charging duration, or at least one parameter related to at least one of these examples. The term "at least one charging parameter" may also be understood as a combination of multiple charging parameters in the form of a charging file.

[0015] The method may be automatically performed by a processor.

[0016] A second aspect of the invention relates to a control unit having a processor, which is configured to perform the above-mentioned and following methods. The control unit is preferably an elevator control unit, which has an interface for receiving elevator call data and preferably for sending switching instructions for switching elevator electrical components. The control unit may include hardware and / or software modules. In addition to the processor, the control unit may also include a memory and a data communication interface for wireless and / or wired data communication with peripheral devices. The control unit or the elevator control unit can be electrically connected to the elevator components via an interface. The elevator components that send elevator call data to the control unit or the elevator control unit via the interface include, for example, floor operating panels, car operating panels (COP) (English: landing operating panels (LOP), car operating panels (COP)), target call controllers or mobile phones with corresponding applications (App) (for example, connected to the control unit or the elevator control unit via GSM or Bluetooth). The elevator components used for switching are, for example, car lighting and / or shaft lighting, electric car drives for moving at least one car of the elevator, electric door drives for moving at least one car door and / or shaft door of the elevator, sensors, such as light barriers, load measuring devices or distance measuring devices.

[0017] The third aspect of the present invention relates to a power supply system for an elevator. The power supply system comprises: a grid connection part for connecting the power supply system to a grid; a battery connection part for connecting the power supply system to a battery; a power module configured to provide electric energy from the grid and / or the battery to the elevator and charge the battery; and a control unit as described above.

[0018] A fourth aspect of the invention relates to an elevator. The elevator comprises: a car that can be moved in a shaft between multiple floors of a building; an electric drive for driving the car; a battery; and a power supply system as described above and below. Preferably, the elevator also comprises at least one electrical component selected from the list including a car lighting and / or a 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 a shaft door of the elevator, a sensor, such as a light barrier or a load measuring device or a distance measuring device.

[0019] It is possible for the elevator to be supplied directly with the battery voltage present at the terminals of the battery, ie without additional rectification and / or without additional DC voltage conversion.

[0020] The electric drive may comprise one, two or more electric motors to drive the car. For example, each electric motor may be coupled to its own counterweight.

[0021] Further aspects of the invention relate to a computer program and to a computer-readable medium on which the computer program is stored.

[0022] The computer program comprises instructions which cause a control unit as described above and below to execute the method steps of the method as described above and below.

[0023] The computer readable medium may be a volatile or non-volatile data storage. For example, the computer readable medium may be a hard disk, a USB memory, a RAM, a ROM, an EPROM, a flash memory, or a combination of at least two of these examples. The computer readable medium may also be a data communication network capable of downloading program code, such as the Internet or a cloud.

[0024] Features of the method described above and below may also be features of the control unit, the computer program and / or the computer-readable medium (features of the control unit, the computer program and / or the computer-readable medium may also be features of the method described above and below).

[0025] The embodiments of the present invention may be considered to be based on the concepts and knowledge described below, but not to limit the present invention.

[0026] According to one embodiment, at least one charging parameter may be adapted using a first characteristic curve representing a relationship between at least one charging parameter and the efficiency of charging the battery. In other words, at least one charging parameter may be optimized taking into account a desired efficiency to be achieved when charging the battery. "Efficiency" may be understood as the efficiency of a charging device for charging the battery, as well as the efficiency with which the battery is charged, or as the overall efficiency when charging the battery.

[0027] According to one embodiment, at least one charging parameter can be adapted using a second characteristic curve representing the relationship between at least one charging parameter and the service life of the battery. In other words, at least one charging parameter can be optimized taking into account the expected service life of the battery.

[0028] The first and / or second characteristic curve can be stored in a memory of the control unit, for example, in the form of a lookup table and / or a mathematical function. It is also possible to optimize at least one charging parameter outside the control unit, i.e. offline. In this case, for example, charging parameters or charging curves optimized in different ways for charging the battery in different states of the elevator, including an active state and an inactive state, can be stored in the memory.

[0029] According to one embodiment, when adapting at least one charging parameter, efficiency and service life can be weighted differently. For example, service life can be more important than efficiency. In this way, the charging parameters can be optimized so that the battery is charged as gently as possible when not activated. However, the opposite situation is also conceivable. Alternatively, both criteria can also be given equal weight.

[0030] According to one embodiment, at least one charging parameter may be the charging power. This makes it particularly easy to optimize the charging process. For example, when inactive, the battery may be operated at a significantly lower voltage, for example the (average) charging power is more than 10%, more than 30%, more than 50%, more than 70% or more than 90% lower than in the active state.

[0031] According to one embodiment, control instructions may be generated to operate the power module so that the battery is alternately charged and discharged in a plurality of charging and discharging stages.

[0032] For example, the elevator can be disconnected from the grid during each discharge phase and powered by the battery. By repeatedly charging and discharging, it is possible to prevent the battery from over-discharging when the elevator is not in use for a long time. This has a positive effect on the battery's service life.

[0033] For example, the battery can be charged with electricity from the grid during each charging phase. The energy required to charge the battery could also theoretically be provided by the elevator drive motor operating as a generator.

[0034] 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.

[0035] Thus, the conversion losses that occur when the supply voltage is provided only by the power grid (usually an AC power grid) in the inactive state can be avoided. Such losses are usually greater than the losses that occur when the supply voltage is provided by a battery, especially when the supply voltage is a (relatively low) DC voltage. In other words, it is recognized that when the elevator is operated in a particularly energy-saving standby mode, its power consumption is only less than 100W or less than 50W, and providing such a low power consumption via the power grid usually generates huge losses, especially conversion losses. Therefore, it is proposed that the elevator is equipped with a battery, and the battery is mainly used to provide electrical energy for the elevator at least temporarily in the standby phase. The battery can be charged in advance and / or charged at high power during a very short charging phase, thereby generating relatively low conversion losses. The electrical energy stored in the battery during this efficient charging process can be efficiently used during the discharge process to provide low power for the elevator in standby mode. This can improve the energy efficiency of the elevator.

[0036] According to one embodiment, in each charging phase, the battery can be supplied with 10 to 100 times, in particular 10 to 50 times, more power than is extracted from the battery in each discharging phase. This can improve efficiency compared to designs with lower energy conversion in the charging phase.

[0037] 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 has a positive effect on the service life of the battery.

[0038] According to one embodiment, the state of charge of the battery at the end of each discharge phase can be between 30% and 50%, in particular between 35% and 45%. This also has a positive effect on the service life of the battery. In addition, at the end of each discharge phase, the battery still has sufficient capacity to enable emergency operation of the elevator, in particular when the power supply of the elevator via the power grid is interrupted.

[0039] According to one embodiment, each discharge phase can last at least 20 times longer, in particular at least 50 times longer, than each charge phase. Such values ​​have proven to be particularly advantageous in experiments.

[0040] For example, each charging phase may last less than 15 minutes, in particular less than 10 minutes. Tests have shown that charging phases of 6 minutes each are particularly suitable for practical use. On the other hand, each discharging phase may last, for example, more than 1 hour, in particular more than 2 hours. Tests have shown that discharging phases of 3 hours each are particularly suitable for practical use.

[0041] According to one embodiment, a power between 30W and 60W may be supplied to the elevator in each discharge phase. In other words, a power between 30W and 60W may be drawn from the battery in each discharge phase. This power may, for example, correspond to the maximum power that the elevator can absorb in an inactive state in each discharge phase to meet certain energy efficiency standards. Specifically, this power should not be higher than 50W.

[0042] According to one embodiment, a power between 700 W and 1000 W may be supplied to the battery in each charging phase. In other words, a power between 700 W and 1000 W may be obtained from the grid in each charging phase.

[0043] For example, at least 70 Wh of energy, in particular at least 90 Wh, for example 95 Wh, can be achieved in each charging phase.

[0044] According to one embodiment, a control instruction may also be generated to disconnect the battery and / or power module from the grid at least in stages. For example, in each discharge stage, the battery and / or power module may be disconnected from the grid.

[0045] According to one embodiment, the method may further include: when it is identified that the elevator is in an 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.

[0046] To this end, the electrical component can be at least temporarily switched off, for example by disconnecting it from the output of the power module. Alternatively or additionally, the electrical component can be at least temporarily switched on in an energy-saving state, wherein the power module supplies the electrical component with a lower input power than in the current state.

[0047] The at least one electrical component can be, for example, at least one of the following: a car lighting and / or a shaft lighting, an electric car drive for moving at least one car of the elevator, an electric door drive for moving at least one elevator door, a car door and / or a shaft door of the elevator, a sensor, for example a light barrier or a load measuring device or a distance measuring device.

[0048] As a result, the energy consumption of the elevator can be further reduced when it is not in use. In addition, this standby operation has a positive effect on the service life of the battery, as less energy is consumed from the battery.

[0049] According to one embodiment, the method may further comprise: when it is recognized that the elevator is in the active state again: adapting at least one charging parameter to the active state; generating further control instructions to control the power module so that the battery is charged at least in stages according to at least one charging parameter adapted to the active state. In other words, in the active state of the elevator, the battery can be charged in a charging mode different from that in the inactive state of the elevator. For example, in contrast to the inactive state, at least one charging parameter adapted to the active state can already be optimized with respect to the highest possible efficiency (see also above).

[0050] For example, an activation state can be detected when a new destination call is registered and / or when the car door and / or shaft door of the elevator is to be opened. The activation state can correspond, for example, to a normal operating mode, i.e. to a (fault-free) travel operation of the elevator. In this case, the combined use of the power grid and the battery can better absorb peak loads. In the event of a fault, for example, when the (normal) power supply via the power grid is interrupted, the battery can also be used to provide emergency power supply for the elevator.

[0051] According to one embodiment, the power module can be configured to provide the output voltage of the battery as a supply voltage for supplying electrical energy to the elevator. The supply voltage can be, for example, a DC voltage of at least 12 V, at most 120 V, in particular at most 60 V, preferably 48 V (see above). Such a supply voltage in the low voltage range allows the elevator to be operated particularly energy-efficiently.

[0052] That is, 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 a design that provides the supply voltage only by converting the battery voltage (e.g., by changing its voltage level), which would result in additional losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Neither the description nor the accompanying drawings should be construed as limiting the present invention.

[0054] Figure 1 An elevator according to an embodiment of the present invention is shown.

[0055] Figure 2 The flow of the charging and discharging phases for charging or discharging a battery of an elevator in a method according to an embodiment of the invention is shown.

[0056] Figure 3 A first characteristic curve used in a method according to an embodiment of the present invention is shown.

[0057] Figure 4 A second characteristic curve used in the method according to an embodiment of the present invention is shown.

[0058] The drawings are schematic diagrams only and are not drawn to scale. The same reference numerals in different drawings indicate the same or equivalent features. DETAILED DESCRIPTION

[0059] Figure 1 An elevator 1 is shown for transporting people and / or objects between a plurality of floors 3 of a building 5. To this end, the elevator 1 comprises a car 7 which is arranged to be movable in a vertical shaft 9 of the building 5 and an electric drive 13 for raising and lowering the car 7.

[0060] The electrical energy supply of the elevator 1 is ensured by a power supply system 14, which comprises a power module 15, a battery connection 16, a grid connection 17 and a control unit 18. The power module 15 is connected on the input side via the grid connection 17 to a grid 19, for example a three-phase grid, and via the battery connection 16 to a rechargeable battery 20, and on the output side to the electric drive 13 and to other electrical consumers (not shown) of the elevator 1, for example to car lighting or shaft lighting, electric door drives for opening or closing car doors and / or shaft doors, light barriers in the door region of the car 7 and / or the floor 3 or load measuring devices for measuring the load of the car 7.

[0061] The power module 15 can be configured to selectively supply electrical energy from the grid 19 or the battery 20 or from both energy sources to certain electrical consumers of the elevator 1. In addition, the power module 15 can be configured to replenish the battery 20 with electrical energy from the grid 19. If the electric drive 13 is used to brake the car 7, i.e. as a generator, the battery 20 can also be charged by recuperation.

[0062] 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.

[0063] As long as the control unit 18 detects that the elevator 1 has not been used for a certain period of time, the control unit can switch the elevator 1 from the current operating mode to the energy-saving mode. This situation occurs, for example, when all outstanding destination calls have been processed and all doors of the car 7 and / or shaft 9 have been closed.

[0064] In 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 at a reduced input power. In particular, the entire elevator 1 can be deactivated, except for the control electronics (which can include the control unit 18 and the power module 15). This can significantly reduce the energy consumption of the elevator 1. The deactivated and / or non-deactivated consumers can then be powered by the battery 20.

[0065] The control unit 18 comprises a memory 23 storing a computer program and a processor 25 configured to implement the method for controlling the power supply of the elevator 1 described below by executing the computer program.

[0066] In this example, when the control unit 18 recognizes that the elevator 1 is to be operated in energy-saving mode, the control unit generates a control instruction 26 which causes the power module 15 to alternately charge and discharge the battery 20 in a certain sequence of charging phases 27 and discharging phases 29 (see Figure 2 ).

[0067] For example, the battery 20 can be connected to the grid 19 during a charging phase 27, wherein the remaining consumers of the elevator 1 can be disconnected from the grid 19 and powered by the battery 20. Conversely, during a discharging phase 29, the elevator 1 is powered only by the battery 20.

[0068] The power module 15 can be configured to provide the elevator 1 with the same supply voltage in different charging phases 27 and discharging phases 29. This can be a DC voltage in the low voltage range up to 120 V, for example 48 V. However, an AC voltage can also be used as the supply voltage.

[0069] The supply voltage may be equal to or substantially equal to the battery voltage applied to the connection terminals of the battery 20. Thus, no additional voltage conversion is required, which further improves the energy efficiency of the elevator 1.

[0070] like Figure 2 As shown, the charging phase 27 and the discharging phase 29 may be constant, for example characterized by a constant length and / or a constant charging or discharging power ( Figure 2 The ordinate of the diagram depicted represents power or energy absorbed or discharged by the battery 20). However, the properties of the charging and / or discharging phases may also vary over time.

[0071] As described above, the control unit 18 can also be configured to generate a deactivation instruction 30 which causes one or more of the abovementioned electrical consumers of the elevator 1 to remain disconnected from the grid 19 and additionally from the battery 20 as long as the elevator 1 is operated in the energy-saving mode.

[0072] As soon as a new destination call is received or the doors of the car 7 and / or the shaft 9 are opened, the control unit 18 can switch the elevator 1 back to normal operating mode. To this end, the control unit 18 generates a further control command 31, which causes the power module 15 to supply the elevator 1 with electrical energy primarily via the grid 19, optionally with the assistance of the battery 20, in order to absorb load peaks.

[0073] Below, for example, the energy consumption of the elevator 1 in the energy-saving mode is calculated. Here, the process of the charging phase 27 and the discharging phase 29 lasts for a period of about 24 hours.

[0074] If the elevator 1 consumes a required power of 40 W in a 3-hour discharge phase 29, 120 Wh of energy is taken from the battery 20. At the end of the discharge phase 29, the state of charge (SOC) of the battery 20 is 30%. In the subsequent 6-minute charging phase 27, the battery 20 is charged at a charging power of 15 A × 48 V = 720 W until a charge level of 90% is reached. Together with the required 40 W of power, the total power is 950 W at an efficiency of 80%, which corresponds to an energy consumption of 95 Wh.

[0075] For example, the battery 20 may be charged and discharged in the following sequence. Here, "R" represents a six-minute charging phase 27 and "D" represents a one-hour discharging phase 29:

[0076] RDDDRDDDRDDDRDDDRDDDR DDDRDDDRDDR

[0077] Therefore, the total energy consumption of elevator 1 during the charging stage is 95Wh×9=855Wh.

[0078] Therefore, the total energy consumption of elevator 1 during the discharge phase is 40W×23h=920Wh.

[0079] In the charging phase 27 , the battery 20 can be charged using one or more charging parameters (here, the charging power P) that are specifically adapted to the energy-saving mode.

[0080] The charging power P can be determined, for example, by means of a first characteristic curve 33 (see FIG. Figure 3 ) and a second characteristic curve 35 (see Figure 4 ) to optimize.

[0081] In this example, the efficiency η increases with increasing charging power P, whereas the service life L becomes shorter with increasing charging power P (ie the two characteristic curves 33 , 35 are somewhat opposite).

[0082] When optimizing P, the two criteria of efficiency and service life can be given the same weight or different weights.

[0083] It is possible to determine different sets of charging parameters, i.e. different charging profiles or charging modes, for the active and inactive states of the elevator 1. For example, in this case, further control instructions 31 can be generated to charge the battery 20 also in the active state, i.e. in the normal operating mode, with a set of charging parameters specifically adapted to this case.

[0084] Finally, it should be noted that the terms "having", "comprising", "with" etc. do not exclude other elements or steps, and the indefinite article "a" or "an" etc. does not exclude a plurality. It should also be noted that features or steps described with reference to one of the above embodiments may also be used in combination with features or steps described with reference to other above embodiments. Reference signs in the claims should not be considered as limiting.

Claims

1. A computer-implemented method for controlling the power supply of an elevator (1), wherein: The elevator (1) comprises a power module (15) for supplying electric energy to the elevator (1) from a power grid (19) and / or a battery (20), wherein the power module (15) is also configured to charge the battery (20), and the method comprises: When it is detected that the elevator (1) is in an inactive state, less electrical energy is drawn from the battery (20) in the inactive state than in the active state of the elevator (1): Adapting at least one charging parameter (P) for charging the battery (20) to the inactive state; A control command (26) is generated for controlling the power module (15) so that the battery (20) is charged at least in stages according to at least one charging parameter (P) adapted to the inactive state.

2. The method according to claim 1, in, At least one charging parameter (P) is adapted using a first characteristic curve (33) and / or using a second characteristic curve (35), wherein the first characteristic curve represents a relationship between at least one charging parameter (P) and an efficiency (η) when charging a battery (20), and the second characteristic curve represents a relationship between at least one charging parameter (P) and a service life (L) of the battery (20).

3. The method according to claim 2, in, When adapting at least one charging parameter (P), the efficiency (η) and the service life (L) are weighted differently.

4. The method according to any one of the preceding claims, in, At least one charging parameter (P) is the charging power.

5. The method according to any one of the preceding claims, in, Control instructions (26) are generated to alternately charge and discharge the battery (20) in a plurality of charging phases (27) and discharging phases (29).

6. The method according to claim 5, in, At the end of each charging phase (27), the state of charge of the battery (20) is between 65% and 100%, in particular between 70% and 90%; and / or At the end of each discharge phase (29), the state of charge of the battery (20) is between 30% and 50%, in particular between 35% and 45%.

7. The method according to any one of the preceding claims, in, A control command (26) is also generated to disconnect the battery (20) and / or the power module (15) from the power grid (19) at least in stages.

8. The method according to any one of the preceding claims, further comprising: When the elevator (1) is detected to be in an inactive state: At least one electrical component (13, 14, 15, 18, 23, 25) of an elevator (1) is switched from a current state to an energy-saving state, in which the at least one electrical component (13, 14, 15, 18, 23, 25) consumes less electrical energy than in the current state.

9. The method according to any one of the preceding claims, further comprising: When it is detected that the elevator (1) is activated again: Adapting at least one charging parameter (P) to the activation state; Another control command (31) is generated for actuating the power module (15) so that the battery (20) is charged at least in stages according to at least one charging parameter (P) adapted to the activation state.

10. A control unit (18), preferably an elevator control unit (18), having an interface for receiving elevator call data and preferably for sending switching instructions for switching electrical components of the elevator, the control unit comprising a processor, the processor being configured to perform the method according to any of the preceding claims.

11. A power supply system (14) for an elevator (1), wherein: The power supply system (14) comprises: A power grid connection part (17), used for connecting the power supply system (14) to a power grid (19); A battery connection portion (16), used to connect the power supply system (14) to the battery (20); A power module (15) for supplying electric energy to the elevator (1) from a power grid (19) and / or a battery (20), wherein the power module (15) is also configured to charge the battery (20); A control unit (18) according to claim 10.

12. The power supply system (14) according to claim 11, in, The power module (15) is configured to provide the output voltage of the battery (20) as a supply voltage for providing electrical energy to the elevator (1).

13. An elevator (1), comprising: A car (7) which can be moved in a shaft (9) between a plurality of floors (3) of a building (5); An electric drive (13) for driving the car (7); Battery (20); The power supply system (14) according to claim 11 or 12; and preferably At least one of the following electrical components: car lighting and / or shaft lighting, electric car drive for moving at least one car of the elevator, electric door drive for moving at least one car door and / or shaft door of the elevator, sensors such as light barriers, load measuring devices or distance measuring devices.

14. A computer program comprising instructions causing a control unit (18) according to claim 10 to perform the method steps according to any one of claims 1 to 9.

15. A computer readable medium having stored thereon a computer program according to claim 14.

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