WO2019179582A1

WO2019179582A1 - Wirelessly powered window operator

Info

Publication number: WO2019179582A1
Application number: PCT/DK2018/050054
Authority: WO
Inventors: Lars LANGBO; Michael TWARDAK
Original assignee: Vkr Holding A/S
Priority date: 2018-03-23
Filing date: 2018-03-23
Publication date: 2019-09-26
Also published as: EP3769396A1

Abstract

The invention relates to a window aperture operator comprising an actuator operated by a DC-motor, a power storage device, and a controller configured for controlling the DC-motor, and thereby the actuator. The controller is configured for wireless send and receive data via a data communication interface. The window aperture operator further comprises a power communication interface configured for receiving radio frequency electric power transmitted wirelessly from an electric power transmitting device. The controller is further configured for control the state of charge of the power storage device by managing radio frequency electric power to the power storage device. The managing includes that the controller is configured to request and suspend transmittal of radio frequency electric power by sending data via the data communication interface based on the state of charge of the power storage device.

Description

WIRELESSLY POWERED WINDOW OPERATOR

Field of the invention

[0001] The present invention relates to a wirelessly powered window aperture operator, window aperture operator system and method of controlling the power wirelessly transmitted to the window aperture operator

Background of the invention

[0002] Devices such as windows and window coverings may comprise actuators for the purpose of providing automated functions of the devices, e.g. a function for opening/closing windows or moving blinds. [0003] Such devices require electricity, which may be delivered by an electrical system operating at 24VDC or 230 VAC. Establishing an electrical system for powering an automated window or shutter may come at a high installation cost, particularly for the case of retrofitting of these window devices into existing buildings.

[0004] This is typically overcome, in the prior art, by the use of solar cells (or photovoltaic systems). In these systems, the solar cell is used to charge a battery, such that power is available when e.g. the sun is not shining.

[0005] However, due to the fact that the sun is a very unreliable resource of energy (solar power depends on the time of day, the seasons of the year, and weather conditions and snow), the battery has to have a high capacity in order to secure all- year-round operation of the window system. A solar cell and a high capacity battery comes at a high cost. Prior art EP0463452 and US9035593 both disclose actuators powered from solar cells which are suffering from the above problems.

[0006] Accordingly, there is a need to address the problem with providing energy to automated window systems at a low cost. .It may thus e.g. be an object of the invention, to provide an improved method of controlling a drive apparatus of a window power by a power storage device which is charged by wireless power transmission. Summary of the invention

[0007] The inventors have identified the above-mentioned problems and challenges related to control of an electric window aperture operator, and subsequently made the below-described invention which may improve the life time of the power storage device powering such electric window aperture operator and ensure sufficient state of charge of the power storage device when needed for operation of the electric window aperture operator.

[0008] The invention relates to an electric window aperture operator comprising of a chain actuator or spindle actuator or winding actuator comprising; an actuator operated by a DC-motor and a gear drive train, a power storage device configured for powering the DC-motor, and an electric window aperture operator controller configured for controlling the DC-motor, and thereby the actuator. Wherein the electric window aperture operator controller is configured for wireless send and receive data via a data communication interface. Wherein the electric window aperture operator further comprises a power communication interface configured for receiving radio frequency electric power transmitted wirelessly from an electric power transmitting device, the electric power transmitting device being located remote from the electric window aperture operator, and wherein the electric window aperture operator controller is further configured for control the state of charge of the power storage device by managing radio frequency electric power to the power storage device. Wherein the managing includes that the window aperture operator controller is configured to request and suspend transmittal of radio frequency electric power by sending data via the data communication interface based on the state of charge of the power storage device. [0009] According to an embodiment of the invention, the electric window aperture operator controller furthermore is configured for controlling the power consumption of the power storage device.

[0010] Controlling the state of charge of the power storage device and the power consumption is advantages in that it has the effect that the relatively small amount of wirelessly transmitted powered is used as efficient as possible in relation to charging of the power storage device and so that power is always available on when needed to operate the electric window aperture operator. Power consumption should be understood as withdrawing current from the battery and thereby reducing the state of charge of the battery.

[0011] The electric window aperture operator is understood as part of a window which adds functionality to the window. Examples of added functionality, may include opening and closing the window for ventilation purposes, opening and closing of blinds for controlling the amount of incoming light, actuation of awnings for creating shading, etc. The electric window aperture operator preferably comprises a controller enabling the control of functionality.

[0012]

[0013] The power storage device is preferably a battery. The SOC (SOC; State Of Charge) of the battery can be controlled e.g. by controlling the voltage level between the poles of the battery. Hence, by knowledge of the SOC, knowledge of the remaining capacity of the power storage device and thereby the remaining time the actuator can operate without the power storage device being charged.

[0014] The electric window aperture operator controller may be any kind of logic circuit capable of processing input data to obtain output data. The electric window aperture operator controller preferably receives input from sensors measuring temperature, light, voltage, etc. Based on processing of this input data, it facilitates control of the above-mentioned functionalities.

[0015] The winding, chain and spindle actuators are advantageous in that they have the effect that they are compact and facilitates a strong actuation force which is necessary for e.g. opening and closing of e.g. heavy top-hinged windows. In addition, a chain actuator offers an actuation path perpendicular to the main axis of the actuator body. This is particular advantageous in that the actuator can be incorporated more aesthetically into e.g. the electric window aperture operator. Hence the electric window aperture operator controller can by means of the actuator and DC-motor control the above-mentioned functionalities.

[0016] The wireless data communication interface is advantageous in that it has the effect, that the controller can send data indicative of current system status, as well as receive control signals based on which the above-mentioned functionalities may be controlled.

[0017] The wireless power communication interface is advantageous in that it has the effect, that the controller can receive wirelessly transmitted electrical power, and hence charge the power storage device using this wirelessly received power i.e. no need for fixed electric installation is needed in order to facilitate operation of the actuator.

[0018] According to an embodiment of the invention, the power transmitter device comprises one or more power transmitting antennas and a data communication interface configured for sending and receiving data. [0019] Having a plurality of power transmitting antennas is advantageous in that it allows for a high directionality of the transmitted wireless power by having each antenna sending power signals with different phases. A higher directionality implies a higher efficiency of the transmitter system, because less energy is radiated in directions where no receiving antenna is present. [0020] Having a data communication interface is advantageous in that it has the effect that the power transmitter device can send and receive data communication signals. Such data communication signals are useful for configuring the power transmitter device to send wireless energy to the one or more receiving antennas. Furthermore, such communication signals could be used in diagnostics of the system. For instance, the one or more power transmitting antennas may be malfunctioning, and then a fault message could be transmitted to the power transmitter device, that no wireless power is received from the data communication interface of the controller. [0021] According to an embodiment of the invention, the electric power transmitting device is positioned on the ceiling. This is advantages in that it has the effect, that neither furniture’s, animals nor humans inside the room will unintentionally block the line of sight between the electric power transmitting device and the window aperture operator

[0022] According to an embodiment of the invention, the actuator is electrically connected to the power communication interface and operated in real-time as the power communication interface receives power from the electric transmitting device.

[0023] This is advantages in that it has the effect, that the even when the power storage device is not able to deliver power for operation of the actuator, the actuator is still operatable. Accordingly, the speed of e.g. screening a window will not be as high as if power was available from the power storage device, but even a slow screening of the window would in this case of malfunction of the power storage device appreciated.

[0024] According to an embodiment of the invention, the DC-motor is a tubular motor. A winding actuator can employ a tubular motor where the motor and the gears and optionally the battery is all inside a tube, which is advantageous in that it has the effect that it can easily and compactly be incorporated into shading devices and wind up a screen on the tube.

[0025] According to an embodiment of the invention, the data communication interface comprises an antenna configured to both receive and transmit data communication. An antenna capable of both receiving and transmitting data is advantageous in that it has the effect of a more compact antenna design is obtained as opposed to an antenna design comprising an individual receiving and transmitting antenna. [0026] According to an embodiment of the invention, the data communication interface comprises a transmitting antenna and a receiving antenna. Having separate antennas for receiving and transmitting data communication is advantageous in that it offers the flexibility of having different antenna designs for receiving and transmitting. In this way it is possible to implement antennas optimized for receiving and transmitting respectively.

[0027] According to an embodiment of the invention, the power communication interface comprises one or more receiving antennas configured for receiving electric power. Having a plurality of receiving antennas is advantageous in that it has the effect that it offers the effect of a potentially greater power utilization of a pocket of wirelessly transmitted RF-energy.

[0028] According to an embodiment of the invention, the power communication interface comprises a rectifying circuit configured for charging the power storage device. A rectifying circuit is advantageous in that it has the effect of converting the received power into DC-current used for charging the power storage device.

[0029] According to an embodiment of the invention, the electric window aperture operator controller is configured for prior to activating the DC-motor, establishing a state of charge of the power storage device which is higher than the expected power consumption of a required actuation of the DC-motor. This is advantageous in that it has the effect, that it is possible to estimate if the capacity of the power storage device is enough to carry out the required actuation and / or if the capacity after executing the required actuation is above a minimum threshold.

[0030] According to an embodiment of the invention, the electric aperture operator controller is configured to charge the power storage device according to a low power consumption strategy and / or a high power consumption strategy. This is advantageous in that it has the effect that the delivery of wireless power to the electric window aperture operator can be controlled according to power demand, expected power demand, energy price, etc. [0031] According to an embodiment of the invention, the electric window aperture operator controller is configured to control the state of charge of the power storage device based on at least one of the following operation parameters: outside temperature, inside temperature, temperature of the power storage device, voltage level of the power storage device, power consumption from the power storage device, minimum threshold voltage of the power storage device, historic operation data, expected future power consumption required from the power storage device.

[0032] Controlling the voltage level of the power storage device based on operation parameters is advantageous in that it operation of the electric window aperture operator based on real time changes of the operation parameters can be obtained. Due to the fact that activation of the above-mentioned functionalities requires power consumption from the power storage device, the control hereof can be optimised with regards to both the available power and the demand for activation due the measured operation parameters. [0033] Control based on temperature readings of inside and / or outside temperature, is advantages in that it has the effect that actuation of the above-mentioned functionalities can be based on real time temperature.

[0034] Control based on the temperature of the power storage device is advantages in that it can be determined whether or not the power storage device can be charged. A high temperature during charging may reduce the lifetime of the power storage device.

[0035] Control based on the voltage level of the power storage device is advantages in that it can be determined whether or not the power storage device needs to be charged. For instance, if the voltage level is below a minimum threshold voltage, the power storage device needs charging in order to be able to carry out an emergency operation, for instance, an opening or closing of a window.

[0036] Further, control based on historic operation data is advantageous in that it has the effect, that a charging strategy for the power storage device to be able to comply with power demands previously used in similar time periods. Time periods could e.g. a time period between 6 and 10 in the morning.

[0037] Control based on expected future power consumption required from the power storage device is advantages in that it has the effect, that a charging strategy can be used to optimise the charging of the power storage device. [0038] According to an embodiment of the invention, the electric window aperture operator controller is configured to automatically control the actuator on the basis of a plurality of predefined user operation modes, wherein a switching between the plurality of predefined operation modes is automatically determined based on at least one of the following: time of the day, time of the year, change in received power from the electric power transmitter device, ambient light level, SOC of the power storage device.

[0039] This is advantageous in that it has the effect that the user only has to define once e.g. during an initialisation procedure which criteria’s are used to trigger a certain operation mode. For instance, the user may define that the window aperture has to close every day at 8PM, or that a blind has to engage when the ambient light level exceeds a predetermined level.

[0040] A user defined operation mode may be defined by estimated power consumption i.e. expected operation of the window aperture according to the chosen operation mode with knowledge of current SOC of the power storage device and expected timing of operation of the window aperture and thereby power consumption, charging of the power storage device can be planned.

[0041] According to an embodiment of the invention, the electric window aperture operator controller is configured to communicate with a central window system controller. Having a central window system controller is advantageous in that it has the effect of controlling a system consisting of a plurality of electric window aperture operators. This is particularly useful, for instance, in a room comprising a plurality of windows that needs to operate together to establish e.g. a certain light level or temperature. [0042] According to an embodiment of the invention, the electric window aperture operator further comprises a window with a frame and a glazing. This is advantages in that a complete and full functional window including the operator is then established.

[0043] Moreover, the invention relates to an electric window aperture system, comprising: an electric window aperture operator comprising a chain actuator or a spindle actuator or a winding actuator comprising a battery and DC motor and gear train, and an electric power transmitting device. Wherein the electric window aperture operator comprising a power communication interface configured for wirelessly receiving radio frequency power transmitted from the electric power transmitting device. Wherein the electric window aperture operator comprising a data communication interface configured for wirelessly receiving and transmitting data. Wherein during initialisation of the system, a location in a data storage is linked to the electric window aperture operator facilitating the creation of a window aperture operator profile. Wherein the window aperture operator profile at least includes information of direction in space between the electric window aperture operator and the electric power transmitting device. Wherein the information of direction in space is used to optimize the transmittal of radio frequency power transmitted from the electric power transmitting device to the electric window aperture operator.

[0044] According to an embodiment of the invention, the window aperture operator profile is furthermore used for data communication.

[0045] The window aperture operator profile is advantages in that information can be attached or related to a particular electric window aperture operator. This information can then be retrieved or accessed by different communication devices for used in coordinated control of more window operators, estimation of health of the window operator and its components.

[0046] Further, the profile may include information of the physical location of the window operator relative to the power transmitting device i.e. the direction in space where line of sight between the two can be established. This is especially advantages in that the power transmitting device can used this information to target the power pockets transmitted to a particular window operator.

[0047] According to an embodiment of the invention, during operation of the system, the electric power transmitting device is using the link from the data storage to facilitate an optimised wireless electric power communication path between the window aperture operator and the electric power transmitting device. [0048] According to an embodiment of the invention, the data storage is located in the electric window aperture operator or in the electric power transmitting device.

[0049] According to an embodiment of the invention, the electric power transmitting device is configured for transmitting radio frequency power to a plurality of window aperture operators.

[0050] Preferably, the initialisation of the system further includes adjusting the power communication path to enable as much power to be transmitted as possible. This includes adjusting e.g. the position of the antenna, strength and / or phase of the RF-signal carrying the power to the electric window aperture operator. [0051] The database could be implemented in a data storage structure such as a table or database which is particularly relevant if the data storage comprises links to more than one electric window aperture operator.

[0052] Using a pre-initialised link in a data storage to establish a power communication link is advantages in that it has the effect, that at least the direction of the RF-signal which is optimal with respect to amount of power that can be transferred is always used. This is especially true if the system includes a plurality of window aperture operators which are supplied with power from one power transmitting device.

[0053] According to an embodiment of the invention, the electric window aperture system furthermore comprises a communication device is using the link from the data storage to establish a data communication path via which data can be communicated between the communication device and the electric window aperture operator.

[0054] This is advantageous in that it has the effect, that when a plurality of electric window aperture operators is located close to each other e.g. in the same room, then by using the link of the database communication with one specific of the plurality of electric window aperture operators are ensured.

[0055] This is especially advantages in that it has the effect, that when a system comprises more than one window aperture operator, activating a particular window aperture operator can be made via the predefined name (link) stored in the data storage. Accordingly, if the communication device is a smartphone it is possible simply to say the name given to the window aperture operator and an action to be performed. Then by the name (link) of the data storage, the communication device can send instructions to this particular window. [0056] According to an embodiment of the invention, the communication device and the data storage is implemented in the electric power transmitting device. This is advantages in that it has the effect, that the no additional devices are needed to implement the system

[0057] According to an embodiment of the invention, the communication device and the data storage is implemented in a data processing device. The data processing device may be implemented as a cloud based service or a local service including a data storage and with access to the internet. This is advantages in that access to the window can be obtained from anywhere in the world.

[0058] According to an embodiment of the invention, the communication between the electric window aperture operator and the communication device include that the electric window aperture operator provide data and make them accessible to the data communication device which via processing hereof establish status information of the electric window aperture operator.

[0059] Status information should be understood as health status, diagnostic information including estimated end of lifetime of the components of the electric window aperture operator. Further, status information could be understood as operation status including actuator position, component temperature, etc.

[0060] Moreover, the invention relates to a method of controlling a state of charge of a power storage device of an electric window aperture operator, comprising of a chain actuator or spindle actuator or winding actuator comprising; an actuator operated by a DC-motor and a gear train, a power storage device, and an electric window aperture operator controller configured for controlling the DC-motor, and thereby the actuator. [0061] Wherein the electric window aperture operator controller comprises a power communication interface configured for wirelessly receiving electric radio frequency power from an electric power transmitting device, the electric power transmitting device being located remote from the electric window aperture operator; wherein the electric window aperture operator controller is controlling the state of charge of a power storage device according to a charging mode. The method comprising the steps of: establishing the state of charge of the power storage device initializing a wireless electric power transfer link between the electric power transmitting device and the power communication interface, controlling the state of charge of the power storage device during the charging mode in order to reach a maximum state of charge threshold suspend the wireless electric power transfer link between the electric power transmitting device and the power communication interface.

[0062] According to an embodiment of the invention, the electric window aperture operator controller is furthermore controlling the power consumption from the power storage device according to a consumption mode, wherein the state of charge of the power storage device at the end of the consumption mode is below a minimum state of charge threshold. [0063 ] According to an embodiment of the invention, the state of charge of the power storage device at the end of the charging mode is at the maximum state of charge threshold.

[0064] Charging mode should be understood as a period of time in which the power storage device is charged. During the charging period, power may also be consumed from the power storage device. Consumption mode should be understood as a period of time in which power is consumed from the power storage device. During the consumption mode, the power storage device may also be charged. [0065] The ability of reaching a threshold voltage level of the power storage device at the beginning of a consumption mode is advantageous in that it has the effect that the required energy is available from the power storage device to perform the necessary operations during the consumption mode. [0066] Charging the power storage device in a controlled manner according to determined charging and consumption modes is advantages in that it has the effect, that the number of charges of the power storage device is reduced which increases the lifetime of the power storage device. This is especially advantageous in situations where the power storage devices are expensive. [0067] The maximum state of charge threshold can be adjusted by adjusting the parameter of the control software executed by the controller. Preferably, the maximum state of charge is less than 100% of the capacity of the battery and between 80% and 90% of the absolute maximum theoretically state of charge of the battery. Preferably, after charging e.g. at the end of a charging mode the state of charge of the battery equals between 10 and 25 full operation cycles of the actuator of the window operator. One full operation cycle is defined e.g. by driving the actuator from a fully closed position to a fully open position.

[0068] The minimum state of charge threshold can also be adjusted by adjusting the parameter of the control software executed by the controller. The minimum state of charge threshold is determined to allow at least one full operation cycle of the actuator of the window operator. This is to ensure e.g. that a window can always return to closed position.

[0069] According to an embodiment of the invention, the charging mode is determined based on energy optimization, expected energy consumption during the subsequent consumption mode, and / or number of charging periods. This is advantages in that it has the effect that, the charging of the power storage device, can be made cheap as possible with as few charging periods as possible still complying with expected power consumption for a subsequent period of time. Reducing the number of charging’s increase the lifetime of the power storage device. [0070] Further, the threshold voltage level can be determined based on energy optimization and / or expected energy consumption during the subsequent consumption mode. This is advantageous in that it has the effect that the power storage device may be charged to a high level, for instance 90 %, or a less high level, for instance 50 %, depending on the current price of electricity. If the following consumption mode requires very little energy, the threshold voltage level may be lower than compared to the case of a subsequent consumption mode requiring a greater amount of energy.

[0071] According to an embodiment of the invention, the control of the transmitted electric power during the charging mode is determined by the length of the charging mode. This is advantageous in that it has the effect that the electrical load on the power storage device may be reduced. If, the charging mode is long, for instance during the night, a low transmitted power may be sufficient to reach the threshold voltage for the subsequent consumption mode. The drawings

[0072] Various embodiments of the invention will in the following be described with reference to the drawings where figure 1 illustrates elements for the invention according to a first embodiment, figure 2a and 2b illustrates location of a power transmitter according to an embodiment of the invention, figure 3 illustrates location of power transmitter and receiver according to an embodiment of the invention, and figure 4 illustrates a window according to an embodiment of the invention. Detailed description

[0073] Figure 1 illustrates an electric window aperture operator (sometimes simply referred to as operator) 1 according to a preferred embodiment of the invention. The operator 1 is connected to a window 16, thereby facilitating controlling a function of the or in relation to the window 16 such as opening, closing, screening, etc. Such functions are preferably facilitated by a mechanical connection between part of the window 16 and an actuator 2 of the operator 1.

[0074] The functionalities preferably include opening and closing of the window 16, opening and closing of a screen mounted on the window 16. Opening and closing of the window 16 is beneficial for regulating the inside temperature. Opening and closing of a window blind is beneficial for regulating the amount of light entering through the window 16. Furthermore, the functionality may also include controlling the position of an awning.

[0075] The actuator 2 preferably includes a chain actuator or a spindle actuator or a winding actuator. A chain actuator or a spindle actuator is preferably used for opening and closing of the window 16. A winding actuator is preferably used for actuating a screening such as a roller blind.

[0076] Motion of the actuator 2 is preferably initiated by a motor 3. The motor 3 is preferably powered from a power storage device 4 such as a battery. Hence the motor 3 is of a type which can be powered from a battery such as a brushless motor or a DC motor. Control of the motor 3 include start, stop, direction of rotation of the motor axis, rotation speed of the motor axis, etc.

[0077] The power storage device 4 is preferably implemented as a rechargeable battery e.g. a battery of the Li-ion or NiMh famililes, configured to receive and deliver electrical power. Generally, the battery or the power storage device 4 may employ battery cells or super capacitor or a combination of both. A hybrid power storage with separate cell(s) for the controller and separate cell(s) for the motor is also possible. In case of complete power drain, which may be the case in new uninhabited buildings etc., the controller may also have an emergency power connector or emergency battery to allow the controller 5 to wake up and initiate charging.

[0078] The motor 3 is preferably controlled by an electric window aperture operator controller (sometimes simply referred to as controller) 5. The controller 5 may include a data storage 11 for storing a plurality of operation modes, threshold values, etc. based on which the motor 3 and thereby the functionalities are controlled. The controller 5 may also control the functionalities based on control signals received via a data communication interface 6 from an external communication device 13. Further, the controller 5 may communicate status information of the operator 1 or components hereof, in relation to the window 16 or ambient conditions to the external communication device 13.

[0079] The external communication device 13 may by a portable device such as a smartphone or a stationary device such as a system controller 10. The intelligence of the system controller 10 may be distributed in the individual controllers 5 of a plurality of operators 1. In case of distributed intelligence, it is advantageous if the controllers 5 are able to mutual communicate with each other. The external communication device 13 or system controller 10 may also be implemented as a cloud based device accessible from the operators 1 and external devices making the operators 1 internet of thing devices.

[0080] The status information may include present state of charge, present charging rate, future expected charging rate, and present temperature of the power storage device 4 as well as the actuation state of the actuator 2. The actuation state of the actuator 2 is understood as the percentage of full actuation of the actuator. For example, the state of actuation of the actuator is 50 percent indicating that the actuator is positioned in the middle of its actuation range defined by the two end positions of the actuator 2.

[0081] Finally, the operator 1 comprises an electric power communication interface 7 via which power is wirelessly received from an electric power transmitting device 8. The received power is preferably used to charge the power storage device 4. The power communication interface 7 may include one or more power receiving antennas 7a, rectifying circuits 9 and other elements necessary for receiving wirelessly electric power and enable using this to charge a power storage device 4.

[0082] The wirelessly transmitted power (sometimes referred to as a pocket of energy) is transmitted based on an RF (RF; radio frequency) signal. The RF signal can be communicated as a continuous or non-continuous signal.

[0083] The electric power transmitting device 8 includes at least one power transmitting antenna 8a optimized to transmit power along a transmitting axis 17 having one particular direction in space. Preferably the electric power transmitting device 8 comprises a plurality of power transmitting antennas 8a, transmitting an RF signal with a certain phase along the transmission axis 17 for that particular antenna 8a. The receiver power communication interface (7) configured to receiving radio frequency electric power preferably has an array of receiver antennas 7a. For example multiple antenna 7a or antenna unit cell segments. The receiver power communication interface (7) antennas may employ a dielectric material to increase gain for the multiple antennas. Generally, the power transmitting radio frequency is above 0,5 GHz, preferably above 1 GHz. In one example the receiver power communication interface (7) has at least 4 antennas.

[0084] A pocket of energy is created comprising an interference of the plurality of RF signals from the plurality of power transmitting antennas 8a. The pocket of energy is created as the sum of the RF signals from the individual antennas at the position in space where the RF signals interfere constructively. The position in space of the pocket of energy can be changed by adjusting the phase of the individual RF signals.

[0085] Preferably the position in spaced of the pocket of energy is the positioned of the receiving antenna 7a of the electric power communication interface 7. The electric power transmitting device 8 may further include a data communication interface 8b configured to communicate data signals to and from the data communication interface 6 of the operator 1. [0086] It should be noted, that the operator 1 may be a standalone part of / build in or located in connection with to the frame of the window 16, the lining or wall beside the window 16. Preferably, the operator is designed for retrofitting to existing windows 16 thereby enabling replacement or substituting existing solar powered operators 1. [0087] It should be noted, that the stipulated lines on figure 1 are used to illustrate communication paths (data or power) and / or elements which are not necessarily mandator for the basic operation of the operator 1. As an example, on figure 1 could be mentioned the direct power connection between the power receiving interface 7 and the motor 3. Such direct supply of power to the motor may be advantages e.g. where a blind of a faqade window is counter balanced and thereby requires very small amount of power from the motor, especially during the screening process where the blind is extended. Also, an automatic screening process may only need to move with the speed of the moving sun to maintain a certain light level or shadow line.

[0088] The receiving antenna 7a is optimized for receiving power along a receiving axis having a particular direction in space i.e. the optimal location of the power transmitting antenna 8a and the power receiving antenna 7a is where the axis of transmitting and receiving are parallel and coinciding. This together with a distance between transmitting antenna 8a and receiving antenna 7a as short as possible in the range of 0-3 meters, preferably between 0 and 5 meters and line of sight between the receiving and the transmitting antennas 7a, 8a optimizes the amount of power wirelessly transferred.

[0089] Figure 2a illustrates the effect on distance D between the antennas 7a, 8a to ensure the same amount of power received at the receiving antenna 7a, when the angle between receiving and transmitting axis is increased. Accordingly, the location of the antennas is important to optimize amount of power received at the operator 1. Therefore, it is also possible to implement the receiving antenna 7a external to the power receiving interface 7 and external to the operator 1 to optimize the amount of received power. [0090] Figure 2b illustrates the effect of line of sight between the antennas 7a, 8a. A power transmitting antenna 8al located behind a furniture’s such as a couch 20 is less effective compared to a power transmitting antenna 8a2 located above such couch 20. If a person 19 is blocking the line of sight between the antennas 7a, 8a, this will also have effect on the power transmission efficiency. This is illustrated by the thicker / thinner lines where a thick line illustrates the most efficient power transmission signal.

[0091] Accordingly, a preferred installation of the power transmitting device / antenna 8, 8a in a room in which persons 19 are frequently passing through is l50cm - 225cm above the floor. A preferred location is at the ceiling close to an electric outlet, where power is available at the same time as line of sight is not blocked.

[0092] According to an embodiment of the invention, the electric power transmitting device and the electric window aperture operator are separated by a distance less than 8 meters.

[0093] This is advantageous in that it has the effect, that the amount of the energy wirelessly transmitted from the electric power transmitting device and received by the electric power transmitting device decreases when the distance between the power transmitting device and the electric window aperture operator increases.

[0094] This is advantageous in that it has the effect, that installation of the power supply to the window is easy in that no physical electric cable is needed to the window aperture operator. Only the electric power transmitting device needs a fixed electric installation but due to the wireless transmission of power, the location hereof is flexible and can be chosen to be close to an existing electric outlet.

[0095] According to an embodiment of the invention, the lower part of the electric power transmitting device is positioned at least 800 millimeters above floor level of the room in which it is installed. This is advantageous in that it has the effect, that furniture etc. is less likely to be positioned in and thereby blocking line of sight between the electric power transmitting device and the window aperture operator which would decrease the efficiency of the wireless power transmission [0096] According to an embodiment of the invention, the electric power transmitting device is positioned within 500 millimeters from an electric ceiling outlet This is advantageous in that it has the effect, that installation is very easy. Further, the electric power transmitting device will then be located nearby other electric installations and thereby not be a source of aesthetic position in the room.

[0097] The wireless electric power transfer link between the electric power transmitting device 8 and the power communication interface 7 is established by linking the communication interface 7 and the transmission device 8. Preferably the linking may be facilitated by establishing the position in space of the power communication interface 7 relative to the electric power transmitting device 8. The establishing of the position in space of the power communication interface 7 relative to the electric power transmitting device 8 may be achieved by using a data processing device 13 adapted to receive information relating to a pocket of RF energy received by the power communication interface 7. Alternatively, the position in space may be established by the data communication interface 6 or the controller 5 of the operator 1

[0098] During the initialization a confirmation signal to the data communication interface 8b of the electric power transmitting device 8 or to the communication device 13 is transmitted from the operator 1 upon receiving the pocket of RF energy indicating the amount of power received. This information can be used to adjust and thereby optimize the power transmission between the transmission device 8 and the receiving interface 7.

[0099] The operator 1 is advantageous in that the controller 5 is controlling the motor 3 / actuator 2 and thereby the energy consumption from the power storage device 4 and the charging of the power storage device 4. More specific the control of the motor 3 preferably depends on the SOC of the power storage device 4. In addition, the control may be based on status of the charging process of the power storage device 4, including information of actual charging rate, expected future charging rate, expected next activation of the motor 3, etc. [0100] The charging rate should be understood as amount of power received by the operator 1. As mentioned above, this is to a great extent determined by location of the transmitting antenna 8a including obstacles between the transmitting and receiving antennas 8a, 7a such as persons 19. [0101] An example of controlling the motor 3 could be screening or opening the window 16. An example of controlling the charging of the power storage device 4 is to measure temperature of the power storage device and only allow (full) charging of the power storage device when the temperature is below a threshold of e.g. 50 degrees Celsius. This is to protect the battery and thereby increase lifetime hereof. [0102] The controller 5 is preferably configured controlling based on and receive information of a plurality of different operation parameters which may include ambient temperature (of both sides (in / out) of the window 16), real-time power transmission rate i.e. how much power that is transmitted per time period (charging rate), temperature of battery, current e.g. measured in milliamps charged to and consumed from the power storage device 4, voltage of the power storage device 4, time of day, time of actuation of the motor 5, luminance, etc.

[0103] In addition, the controller 5 may communicate with a data storage 11, which may store maximum capacity of the power storage 4 (sometimes referred to as battery), user-defined control modes, etc. Data may be updated or added to the data storage 11 during operation and initialization of the operator 1. An example could be defining how much time the motor 5 has to operate at which speed to facilitate what is 100% opening or screening of a window 16.

[0104] User-defined control modes may include one or more charging modes and one or more consumption modes. Charging mode is characterized in that the control of the operator 1 is optimized to charging of the battery 4 which may include e.g. charging speed or continuity of the charging. The charging speed mainly depends on the power transmission capabilities and rate of the power transmission device 8.

[0105] A charging mode may control the charging so as to ensure reaching a SOC at a determined time. This may include that operation of the motor 3 is second priority i.e. operation is postponed or carried out with reduced power consumption if SOC is below a threshold value. An example of charging mode control could be during periods where operation of the motor 5 is not expected. This could be at night time, where blinds are typically maintained in the same position for several hours. These hours can be defined by a starting hour e.g. at 10PM and a stopping hour e.g. at 6AM i.e. a period of 8 hours.

[0106] By this definition, the controller 5 is now able to plan charging of the power storage device 4 e.g. only charge with a reduced capacity to stretch the charging period. This has the effect that the temperature of the battery 4 is kept at the certain level, this level may be defined as a threshold temperature for the battery 4 during this charging mode and thereby the main control parameter during this period.

[0107] Stretching the charging period also has the effect that the number of charging periods is reduced. At the end of a charging period, preferably the SOC of the battery is 100%. Generally, a SOC of 100% does not necessary equal 100% of the absolute battery capacity. By 100% is understood that the battery is merely full for the used SOC range, which may be for example 70% of the absolute battery capacity. By using less than 100% of the absolute battery capacity the battery lifetime can be increased.

[0108] Prior to (and following) a charging mode is a consumption mode. At this mode, the battery 4 may also be charged. However, during a consumption mode ending e.g. at 10PM, the controller 5 may control such charging to ensure only a minimum SOC of the battery 4. Entering a charging mode with a low SOC is advantages in that it has the effect that the subsequent charging mode can be controlled more flexible and maybe also cheaper due to lower energy prices at night time.

[0109] During a consumption mode, knowledge of next expected activation of the motor 5 can be used to initiate charging and more important to prevent charging. This will lead to a reduced number of time where voltage is applied to the battery 4 which will increase lifetime of the battery 4. Hence a charging mode is defined as a period where control of the SOC is secondary as long as it is above a minimum SOC, preferably the control of the SOC is made based on expected future consumption. [0110] The expected future activation of the motor 3 can be defined in a user-profile. However, the controller 5 may be adapted to learn from use pattern of the individual week days when activation can be expected. This can be e.g. due to sun light, office working hours, weekend etc. in this way the controller 5 may be able to plan when necessary charging are needed.

[0111] Preferably all consumption modes initiates charging if a minimum SOC is measured / established to be able to close / open the window 16 in case of emergency, roll up blinds, etc. If charging is not possible, automatic control of the motor is disconnected, i.e. only manual control of the motor is possible. [0112] From the above it is clear that, the control of the SOC of the battery 4 during a consumption mode preferably includes always ensuring a minimum SOC at the battery 4. In addition, during consumption mode charging the battery 4 is allowed to be able to meet expected consumption / activation of the motor 3. Preferably, at the end of the consumption mode, the SOC of the battery is at a predefined minimum threshold level.

[0113] From the above it is clear that, the control of the SOC of the battery 4 during a charging mode includes optimizing charging to maintain battery temperature at a desired level, and use most energy on charging when the energy price is lowest. Preferably, at the end of the charging mode, the SOC of the battery is at a predefined maximum threshold level such as e.g. 100% SOC.

[0114] Controlling SOC and power consumption either in general or in a consumption mode or charging mode according to the invention is advantageous in that health of the battery 4 is increased. Which is important in that the battery 4 is an expensive part of the operator 1 and the battery 4 has a limited lifetime. In addition, charging and thereby control becomes independent of sunlight and fixed electric installations.

[0115] Control of SOC and power consumption may include charging a battery at the same time as operating the actuator i.e. consuming power from the battery. Therefore, in this situation, the control of the charging of the battery 4 may be stopped for the period of time power is consumed from the battery 4. This would also be the case, if controlled according to a consumption mode (and SOC of the battery is above the minimum threshold value). However, if controlled according the charging mode, e.g. the SOC of the battery 4, next expected consumption or the charging rate could be determining for if the consumption would interrupt the charging.

[0116] Charging a battery by wirelessly received power is advantages over photovoltage systems in that charging (and thereby consumption) can be planned. This leads to control of the charging and consumption with a minimum wear of the expensive battery 4. Charging a battery by wirelessly received power is also advantageous compared to photovoltaic systems because photovoltaic systems produce electricity when the sun shines. And when the sun shines window operators are usually quite hot so in other words, photovoltaic charging is often performed at the worst time with a hot battery which adversely affects the battery lifetime. Another advantage is that photovoltaic systems can become covered up by a retrofitted sun screening or by snow and thereby stop producing power.

[0117] The better planning of charging and consumption leads to a better use of status or health data obtained from the operator 1 and its elements (motor 3, battery 4, etc.). In the situation, the operator 1 is controlled according to a user-defined mode or a control mode developed based on analysis of previously use-pattern (and thereby power consumption) including e.g. temperature measurements, deviations may be measured. Deviations (increase) in power consumption may indicate an error in the motor 3 or actuator 2. Deviations (increase) in battery temperature may indicated an error in the battery 4. Accordingly, such deviations between real-time status information / data compared with historic information / data may be used to estimate state of health of the operator 1 or components hereof.

[0118] Charging of battery 4 and power consumption at the operator 1 could in an alternative embodiment be controlled from the transmitting device 8. This however, would increase the amount of data communicated (bi-directional) between the operator 1 to the transmitting device 8. Such data would include status reports, SOC, answer queries from the transmitting device 8 relating to need of power, start and stop commands, etc. An increased amount of data communicated would lead to an increased power consumption from the battery 4.

[0119] To avoid this, the present invention suggests controlling the power consumption and charging by the controller 5 located at the operator 1. This will inevitable lead to a slightly increased power consumption by the controller 5 in order to execute additional program lines. However, the consumption can be controlled e.g. by only using power for data communication when to the transmission device when required by the SOC of the battery 4. In relation to control of the power transmission, it should be noted reducing the time power is transmitted will reduce power transmittal losses.

[0120] Consumption from the battery 4 by the actuator 2 can be planned according to predefined operation modes including e.g. time of day or light level. Alternatively, the controller 5 may record and preferably analyse (including averaging, correlating, etc.) activity leading to power consumption and / or battery drain (including activating actuator 2, data acquisition, data communication etc.) during a paste period of e.g. 24 hours. Based on this, the controller 5 may control (include override predefined control modes) the operator 1 including the actuator 2.

[0121] Example of data communication may include communication of SOC of the battery 4 to power transmitter 8, temperature and light measurements, past operation history, power transmittal strength, etc. Information of received power can be used by the power transmitter 8 to adjust the power transmission signal. Adjustment may include prioritizing transmittal of power to one of a plurality of operators 1 based on received SOC of the batteries hereof.

[0122] A plurality of windows 16 / operators 1 may be referred to as an electric window aperture system. Such a system is often installed in a room having a plurality of windows 16. When power storage devices 4 of such system are charged by receiving power wirelessly, one or more power transmitting devices 8 are needed. Depending on the design each of the power transmitting devices 8 may transmit power wirelessly to more than one operator 1. [0123] For such system to be able to optimise both power consumption from and power charging of the power storage devices 4, data communication between operator 1 and power transmitting device is advantages. Therefore, during initialisation of such system each of the operators 1 are linked to a specific power communication device 8. This has the effect, that the operator 1 (or external devices) is able to initiate or disconnect transmission of power from the power transmitting device 8.

[0124] Therefore, during in initialisation of the system, each of the operators 1 are linked to a location in a data storage. The data storage may be located either at the operator 1, the power transmitting device 8 or as part of an external data system such as a cloud based solution. The link may be name and when called used by the power transmitting device 8 to identify the calling operator 1 and thereby e.g. which way / antennas 8b should be used to transmit power to the power storage device 4 of the calling operator 1. Accordingly, by this link it is possible to optimise the wireless communication of electric power between the electric power transmitting device 8 and the operator 1 by not simply“broadcasting” the power transmission signal if there are not receiver to the signal leading to a more efficient system.

[0125] Linking the operators 1 to a data storage / server also have the advantages that communication can be provided from one operator 1 to another operator 1 or from the central server 10 to each connected operator 1. Thereby, from a communication device 13 such as a smartphone via the server, it is possible to communicate common, grouped or individual control commands and / or receive status information from the individual operators 1.

[0126] Figure 3 illustrates a window with power receiving antenna 7a located external to the operator (not illustrated) and the power transmitter 8a according to an embodiment of the invention.

[0127] Figure 4 illustrates a roof light/window 16 according to an embodiment of the invention. The window 16 is mounted in relation to a building aperture of building roof. The window comprises a frame 21 and a swinging sash 23 movably attached to the frame 21. The space between the window frame 21 and the inside wall of the building is covered by linings 24.

[0128] The window 16 may be opened and closed by means of an actuator 2 (here a chain actuator). A blind 22 is illustrated on the inside of the window and a roller shutter could be is mounted outside on the window 16 which may be manually or electrically controlled. If electrically controlled, it may be by an operator 1 as described in this document.

[0129] The operator 1 may for the windows illustrated on figure 3 and 4 be located inside or preferably outside. The actuator 2 illustrated on figure 4 is preferably part of an operator 1 as described in this document.

[0130] From the above description, it is now clear that the present invention relates to an electric window aperture operator 1. The operator is furthermore suitable for retrofitting to an existing window. The operator 1 is powered wirelessly by RF power transmission and thereby advantageous in that installation does not require installation of wired power supply and thereby the need of an electrician.

[0131] Further, the operator 1 is advantages in that it may by located outside the window with at least an antenna (the power communication interface 7 or part hereof) located inside the window. This is advantageous in that the window glass has a damping effect on radio communication and thereby the amount of power that can be transmitted through the window glass. Accordingly, the antenna of the data communication interface 6 may either be an integrated part of the operator or parts hereof or an external to the operator 1 connected to the operator 1 e.g. by a an electric signal wire.

Hence, the operator 1 comprising of an electric or electromechanical actuator such as a chain actuator or spindle actuator or winding actuator 2. The actuator 2 is operated by a motor (preferably a DC-motor) 3 and preferably a gear drive train. The operator 1 including motor 3 is powered by a power storage device 4 and a controller 5 is configured for controlling the motor 3 and thereby the actuator 2. The controller 5 is configured for wireless send and receive data via a data communication interface 6. The operator 1 further comprises a power communication interface 7 configured for receiving radio frequency electric power transmitted wirelessly from an electric power transmitting device 8 located remote from the electric window aperture operator 1. The controller 5 is further configured for control the SOC battery 4.

List

1. Electric window aperture operator

2. Actuator

3. DC-motor

4. Power storage device

5. Electric window aperture operator controller

6. Data communication interface

7. Electric power communication interface

a. Receiving antenna (7a)

8. Electric power transmitting device

a. Power transmitting antenna (8a) b. Data communication interface (8b)

9. Rectifying circuit

10. Central window system controller

11. Data storage

12. Wireless electric power communication path

13. Communication device

14. Data communication path

15. Data processing device

16. Window

17. Axis of transmission / receiving of wireless power

18. Electric outlet

19. Person

20. Couch

21. Frame

22. Blind

23. Swinging sash

24. Lining

Claims

1. An electric window aperture operator (1) comprising of a chain actuator or spindle actuator or winding actuator comprising;

an actuator (2) operated by a DC-motor (3) and a gear drive train, a power storage device (4) configured for powering the DC-motor (3), an electric window aperture operator controller (5) configured for controlling the DC-motor (3), and thereby the actuator (2), wherein the electric window aperture operator controller (5) is configured for wireless send and receive data via a data communication interface (6), wherein the electric window aperture operator (1) further comprises a power communication interface (7) configured for receiving radio frequency electric power transmitted wirelessly from an electric power transmitting device (8), the electric power transmitting device (8) being located remote from the electric window aperture operator (1), and wherein the electric window aperture operator controller (5) is further configured for control the state of charge of the power storage device (4). by managing radio frequency electric power to the power storage device (4), wherein the managing includes that the window aperture operator controller (5) is configured to request and suspend transmittal of radio frequency electric power by sending data via the data communication interface (6) based on the state of charge of the power storage device (4).

2. An electric window aperture operator (1) according to claim 1, wherein the electric window aperture operator controller (5) furthermore is configured for controlling the power consumption of the power storage device (4).

3. An electric window aperture operator (1) according to claim 1 or 2, wherein the power transmitter device (8) comprises one or more power transmitting antennas (8a) and a data communication interface (8b) configured for sending and receiving data.

4. An electric window aperture operator (1) according to any of the preceding claims, wherein the electric power transmitting device (8) is positioned on the ceiling.

5. An electric window aperture operator (1) according to any of the preceding claims, wherein the actuator (2) is electrically connected to the power communication interface (7) and operated in real-time as the power communication interface (7) receives power from the electric transmitting device (8).

6. An electric window aperture operator (1) according to any of the preceding claims, wherein the DC-motor (3) is a tubular motor.

7. An electric window aperture operator (1) according to any of the preceding claims, wherein the data communication interface (6) comprises an antenna configured to both receive and transmit data communication.

8. An electric window aperture operator (1) according to any of the preceding claims, wherein the data communication interface (6) comprises a transmitting antenna and a receiving antenna.

9. An electric window aperture operator (1) according to any of the preceding claims, wherein the power communication interface (7) comprises one or more receiving antennas (7a) configured for receiving electric power.

10. An electric window aperture operator (1) according to any of the preceding claims, wherein the power communication interface (7) comprises a rectifying circuit (9) configured for charging the power storage device (4).

11. An electric window aperture operator (1) according to any of the preceding claims, wherein the electric window aperture operator controller (5) is configured for prior to activating the DC-motor, establishing a state of charge of the power storage device (4) which is higher than the expected power consumption of a required actuation of the DC-motor.

12. An electric window aperture operator (1) according to any of the preceding claims, wherein the electric aperture operator controller (5) is configured to charge the power storage device (4) according to a low power consumption strategy and / or a high power consumption strategy.

13. An electric window aperture operator (1) according to any of the preceding claims, wherein the electric window aperture operator controller (5) is configured to control the state of charge of the power storage device (4) based on at least one of the following operation parameters: outside temperature,

- inside temperature,

- temperature of the power storage device (4),

- voltage level of the power storage device (4),

power consumption from the power storage device (4),

minimum threshold voltage of the power storage device (4),

- historic operation data,

expected future power consumption required from the power storage device

(4).

14. An electric window aperture operator (1) according to any of the preceding claims, w Wherein the electric window aperture operator controller (5) is configured to automatically control the actuator (2) on the basis of a plurality of predefined user operation modes, wherein a switching between the plurality of predefined operation modes is automatically determined based on at least one of the following:

- time of the day,

- time of the year,

change in received power from the electric power transmitter device (8), ambient light level,

SOC of the power storage device (4)

15. An electric window aperture operator (1) according to any of the preceding claims, wherein the electric window aperture operator controller (5) is configured to communicate with a central window system controller (10).

16. An electric window aperture operator (1) according to any of the preceding claims, wherein the electric window aperture operator (1) further comprises a window with a frame and a glazing.

17. An electric window aperture system, comprising: an electric window aperture operator (1) comprising a chain actuator or a spindle actuator or a winding actuator comprising a battery and DC motor and gear train, and

an electric power transmitting device (8),

wherein the electric window aperture operator (1) comprising a power communication interface (7) configured for wirelessly receiving radio frequency power transmitted from the electric power transmitting device (8), wherein the electric window aperture operator (1) comprising a data communication interface (6) configured for wirelessly receiving and transmitting data, wherein during initialisation of the system, a location in a data storage (11) is linked to the electric window aperture operator (1) facilitating the creation of a window aperture operator profile, wherein the window aperture operator profile at least includes information of direction in space between the electric window aperture operator (1) and the electric power transmitting device (8), and wherein the information of direction in space is used to optimize the transmittal of radio frequency power transmitted from the electric power transmitting device (8) to the electric window aperture operator (1).

18. An electric window aperture system according to claim 17, wherein the window aperture operator profile is furthermore used for data communication.

19. An electric window aperture system according to any of the claims 17-18, wherein during operation of the system, the electric power transmitting device (8) is using the link from the data storage (11) to facilitate an optimised wireless electric power communication path (12) between the window aperture operator (1) and the electric power transmitting device (8).

20. An electric window aperture system according to any of the claims 17-19, wherein the data storage (11) is located in the electric window aperture operator (1) or in the electric power transmitting device (8).

21. An electric window aperture system according to any of the claims 17-20, wherein the electric power transmitting device (8) is configured for transmitting radio frequency power to a plurality of window aperture operators (1).

22. An electric window aperture system according to any of the claims 17-21, wherein the electric window aperture system furthermore comprises a communication device (13) is using the link from the data storage (11) to establish a data communication path (14) via which data can be communicated between the communication device (13) and the electric window aperture operator (1).

23. An electric window aperture system according to any of the claims 17-21, wherein the communication device (13) and the data storage (11) is implemented in the electric power transmitting device (8).

24. An electric window aperture system according to any of the claims 17-22, wherein the communication device (13) and the data storage (11) is implemented in a data processing device (15).

25. An electric window aperture system according to any of the claims 17-23, wherein the communication between the electric window aperture operator (1) and the communication device (13) include that the electric window aperture operator (1) provide data and make them accessible to the data communication device (13) which via processing hereof establish status information of the electric window aperture operator (1).

26. Method of controlling a state of charge of a power storage device (4) of an electric window aperture operator (1), comprising of a chain actuator or spindle actuator or winding actuator comprising; an actuator (2) operated by a DC-motor (3) and a gear train, and a power storage device (4) an electric window aperture operator controller (5) configured for controlling the DC-motor (3), and thereby the actuator (2), wherein the electric window aperture operator controller (5) comprises a power communication interface (7) configured for wirelessly receiving electric radio frequency power from an electric power transmitting device (8), the electric power transmitting device (8) being located remote from the electric window aperture operator (1); wherein the electric window aperture operator controller (5) is controlling the state of charge of a power storage device (4) according to a charging mode, the method comprising the steps of:

establishing the state of charge of the power storage device (4)

- initializing a wireless electric power transfer link between the electric power transmitting device (8) and the power communication interface (7), controlling the state of charge of the power storage device (4) during the charging mode in order to reach a maximum state of charge threshold suspend the wireless electric power transfer link between the electric power transmitting device (8) and the power communication interface (7).

27 A method according to claim 26, wherein the electric window aperture operator controller (5) is furthermore controlling the power consumption from the power storage device (4) according to a consumption mode, wherein the state of charge of the power storage device (4) at the end of the consumption mode is below a minimum state of charge threshold.

28. A method according to any of the claims 26-27, wherein the state of charge of the power storage device (4) at the end of the charging mode is at the maximum state of charge threshold.

29. A method according to any of the claims 26-28, wherein the charging mode is determined based on:

- energy optimization,

expected energy consumption during the subsequent consumption mode, and / or

number of charging periods.

30. A method according to any of the claims 26-29, wherein the control of the transmitted electric power during the charging mode is determined by the length of the charging mode.