Energy transmission system for sanitary facility

Abstract

To provide an energy transmission system for a lavatory, a corresponding sanitary facility and an energy transmission method for the sanitary facility.SOLUTION: An energy transmission system (1) for a sanitary facility, especially a lavatory, comprises: a first device (2) comprising a primary resonance circuit (3); and a second device (4) comprising a secondary resonance circuit (5) coupled to the primary resonance circuit (3) to wirelessly receive energy intended for an operation of a load (6), wherein the first device (2) varies energy to be transmitted to the secondary resonance circuit (5) for a predetermined period, and the second device (4) determines a value of an intended target parameter on the basis of the period in which the transmitted energy is varied.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an energy transmission system for a sanitary installation, in particular a toilet, and to a corresponding sanitary installation.The subject of the invention is also an energy transmission method for a sanitary installation. [Background technology]

[0002] Sanitary equipment such as toilets, washlets, and sanitary cleaning devices are known in the art and offer enhanced functionality. For example, it is possible to heat components that come into contact with the user. For example, so-called toilet seat ring heaters (also known as toilet seat heating) in toilet seats allow users to enjoy improved comfort. Furthermore, user information such as weight and other physiological data can be collected via corresponding sensors located in the toilet seat and transmitted via a communication link.

[0003] A drawback of such prior art applications is that although they now sometimes have wireless energy transmission (WET), a dedicated communication link is still required in addition to this wireless energy transmission, in particular to be able to send control commands from the toilet seat, for example regarding the temperature setting by the user, to the components providing the input voltage.

[0004] The above communication requirements mean that the overall product complexity increases and manufacturers may incur licensing and certification fees for the use of industry standards such as Bluetooth Low Energy (BLE). Summary of the Invention [Problem to be solved by the invention]

[0005] Against this background, the object of the present invention is to provide a solution that avoids the aforementioned drawbacks and provides an improved energy transmission system for sanitary installations. [Brief explanation of the drawings]

[0006] DETAILED DESCRIPTION OF THE INVENTION

[0007] According to the present invention, this object is achieved by an energy transmission system for sanitary equipment, in particular toilets, comprising a first device having a primary resonant circuit and a second device having a secondary resonant circuit coupled to the primary resonant circuit and configured to wirelessly receive energy intended for the operation of a load. To this end, the first device is configured to vary the energy transmitted to the secondary resonant circuit over a predetermined period of time, and the second device is configured to determine the value of an intended target parameter based on the period over which the transmitted energy is varied. For example, the target parameter can be the temperature to be reached by a toilet seat ring heating functioning as an electric load.

[0008] In this case, the first device may also be referred to as a transmitter and the second device may also be referred to as a receiver.

[0009] In this way, the solution according to the invention allows a circuit intended for wireless energy transmission to be used at the same time for at least one-way communication (from transmitter to receiver), which means that additional communication circuits can be avoided, reducing the overall complexity and the associated manufacturing costs.

[0010] Preferably, the change in the energy transmitted over a predetermined period of time comprises a decrease in the energy transmitted, in this way the second device acting as a receiver can measure or obtain the change in the energy supplied to the load, for example by a voltage drop across a shunt (also known as a shunt resistor or measuring shunt) or by a voltage drop across the load.

[0011] In a preferred embodiment, for this purpose, the second device comprises a measuring device with a shunt, which makes it possible to measure the change in the energy supplied to a load (e.g., a toilet seat ring heater) during a given period based on the resulting voltage drop. Similarly, the supplied energy can be obtained via a voltage divider provided on the voltage supplied to the load (e.g., a toilet seat ring heater).

[0012] Advantageously, the first device comprises a control device configured to clock the input voltage supplied to the first device by pulse duration modulation (PDM). Energy transmitted to the load (in the form of a toilet seat ring heater) can thus be manipulated in the first device by PDM at a resonant transmission frequency. As a result, the primary resonant circuit is operated at resonance, causing an active current to flow, which generates a voltage across the shunt proportional to the active current and corresponding to the load current. In the second device, the load current thus flows through the shunt, generating a voltage proportional to the load current.

[0013] Preferably, the controller is configured to adjust the energy transferred to the secondary resonant circuit by varying the duty cycle of the PDM.

[0014] If the first device reduces the duty cycle or duty factor (i.e., ton / T) of the PDM, less energy is transferred to the second device. In this way, the second device can measure the voltage drop across the shunt and, therefore, the change in energy delivered to the load (e.g., a toilet seat ring heater).

[0015] In a preferred embodiment, the control device is configured to adjust, in particular decrease, the duty cycle over a predetermined period of time, and the second device can thus analyze the measured period and the information transmitted from the first device to the second device, for example using a predefined table.

[0016] Advantageously, the first device comprises a timer whose predetermined period is controllable, which may for example be part of the control device.

[0017] Preferably, the timer is configured to control a number of predetermined time periods associated with different values ​​of the intended target parameter, for example, a table may be provided in which each time period is mapped to a desired temperature level to be communicated to the receiver.

[0018] In a preferred embodiment, a plurality of predetermined periods of time are provided, each having a value in the range of 100-300 ms, in particular 100 ms, 150 ms, 200 ms, 250 ms, and 300 ms. Advantageously, the intended target parameter is the seat ring heating temperature. For example, a 100 ms period during which the energy transmitted from the first device to the second device is reduced corresponds to a desired seat ring heating temperature of 28°C, a 150 ms period corresponds to a desired seat ring heating temperature of 30°C, a 200 ms period corresponds to a desired seat ring heating temperature of 32°C, a 250 ms period corresponds to a desired seat ring heating temperature of 35°C, and a 300 ms period corresponds to a desired seat ring heating temperature of 37°C. These values ​​are merely exemplary and not limiting.

[0019] In this case, the duration may have a relatively large tolerance, for example, a range of 80 ms to 120 ms for a 100 ms duration, a range of 130 ms to 170 ms for a 150 ms duration, a range of 180 ms to 220 ms for a 200 ms duration, a range of 230 ms to 270 ms for a 250 ms duration, and a range of 280 ms to 320 ms for a 300 ms duration. Other tolerances, such as 10 ms, 15 ms, 25 ms, etc., may also be provided.

[0020] In addition to temperature, activation or deactivation of a function may also be an intended target parameter. Such functions include, but are by no means limited to, service aids such as, for example, a flashing LED.

[0021] Preferably, the second device is configured to reduce the transmitted energy. In this way, the second device can transmit information to the first device, creating two-way communication. This is achieved by the fact that when the second device, acting as a receiver, reduces the received energy, the effective current in the primary resonant circuit becomes smaller, and therefore the voltage across the shunt provided in the first device becomes smaller.

[0022] In a preferred embodiment, the second device includes a resonance control device for this purpose. This is configured to connect or disconnect at least one resonance-determining capacitor in the secondary resonant circuit to reduce the active current in the primary resonant circuit. The received energy is thus reduced by changing the resonance of the secondary resonant circuit, rather than by changing the load. This is particularly advantageous because changing the resonance on the secondary side (as opposed to using a "dummy load") does not result in power loss during communication. Furthermore, the load is also supplied with energy (albeit slightly reduced) during communication.

[0023] Advantageously, the first device comprises a measuring device with a shunt, which is configured to detect a voltage drop across the shunt, so that the second device can reduce the energy received and thereby adjust the power for the load, i.e. the toilet seat ring heater, without incurring any active power losses (e.g. associated with adjusting the temperature of the toilet seat ring heater).

[0024] Preferably, the measuring device of the first device acting as a transmitter is configured to determine the absolute value and / or duration of the voltage drop. In this way, the first device can, for example, determine that the second device acting as a receiver reports the reaching of the target temperature and / or the occurrence of a specific error occurring on the receiver side. On the transmitter side, a data structure, for example, a table, can also be provided in which a corresponding feedback or error code is associated with the value and / or duration of the voltage drop.

[0025] According to the present invention, the above object is further achieved by an energy transmission system for a sanitary installation, in particular a toilet, comprising a first device having a primary resonant circuit and a second device having a secondary resonant circuit coupled to the primary resonant circuit and configured to wirelessly receive energy intended for the operation of a load. To this end, the second device comprises a resonance control device configured to connect or disconnect at least one resonance-determining capacitor in the secondary resonant circuit in order to reduce the active current in the primary resonant circuit.

[0026] In this way, the solution according to the present invention allows for one-way transmission of information from a second device acting as a transmitter to a first device acting as a receiver. Because the received energy is reduced by changing the resonance of the secondary resonant circuit, not by changing the load, no power loss occurs during communication. Therefore, a separate communication circuit, for example, for communication from the toilet seat to the toilet bowl, is not required.

[0027] In this case, the first device acting as a receiver of information can be formed, for example, as a toilet bowl. Accordingly, the second device acting as a transmitter of information can be designed, for example, as a toilet seat. For example, sensors located in and / or on the toilet seat for collecting user information such as weight and other physiological data can be provided as transmitters of information.

[0028] Preferably, the first device comprises a measuring device having a shunt, which is configured to detect a voltage drop across the shunt. The toilet seat, acting as a transmitter, can thus reduce energy and thereby adjust the corresponding power for the load without causing any active power loss.

[0029] According to the present invention, the above object is further achieved by a sanitary installation, in particular a toilet, comprising a toilet bowl and a toilet seat and an energy transmission system according to the above description, wherein the first device is arranged in or on the toilet bowl, for example integrated into a component of the toilet bowl, and the second device is arranged in or on the toilet seat. Preferred exemplary embodiments of the energy transmission system are provided for the sanitary installation as well.

[0030] According to the present invention, the above object is further achieved by an energy transmission method for a sanitary installation, the method comprising the steps of transmitting energy from a primary resonant circuit of a first device to a secondary resonant circuit of a second device, the secondary resonant circuit being coupled to the primary resonant circuit; varying, by the first device, the energy transmitted to the secondary resonant circuit over a predetermined period of time; obtaining, by the second device, the period over which the transmitted energy was varied; and determining, by the second device, a value of an intended target parameter based on the obtained period of time.

[0031] In a preferred embodiment, the method includes the steps of decreasing the energy transmitted by the first device, starting a timer, continuously checking whether the current value of the timer has reached a value set by a predetermined period of time, stopping the timer, and increasing the transmitted energy.

[0032] Advantageously, the method comprises the steps of continuously checking the energy received by the second device, starting a timer when a negative deviation in the received energy is detected, stopping the timer when a positive deviation in the received energy is detected, and obtaining the period between the start of the timer and the stop of the timer.

[0033] Further details, features and advantages of the invention are explained in more detail with reference to the following exemplary embodiments.

[0034] The following applies:

[0035] FIG. 1 is a schematic diagram of a first exemplary embodiment of an energy transmission system according to the present invention.

[0036] FIG. 2 is a schematic diagram of a second exemplary embodiment of an energy transmission system according to the present invention.

[0037] FIG. 3 is a flow chart of an example embodiment of a communication from a transmitter to a receiver according to a method of the present invention.

[0038] FIG. 4 is a flow chart of an exemplary embodiment of receiver to transmitter communication according to a method of the present invention.

[0039] 1 shows a schematic diagram of a first exemplary embodiment of an energy transmission system 1 according to the invention. The energy transmission system 1 is intended for sanitary installations, such as toilets, and comprises a first device 2, also called a transmitter, which in this case can be placed in the toilet bowl, and a primary resonant circuit 3. This primary resonant circuit 3 is powered by an input voltage, for example in the range of 12 to 48 volts, preferably 24 volts.

[0040] Furthermore, the energy transmission system 1 comprises a second device 4, also called a receiver, which can be arranged in the toilet seat or seat ring, and a secondary resonant circuit 5. The secondary resonant circuit 5 is operated in a resonant state and is loosely inductively coupled to the primary resonant circuit 3. For example, in this case, the coupling coefficient between the primary resonant circuit 3 and the secondary resonant circuit 5 can be less than 1, e.g. k=0.3. The secondary resonant circuit 5 is configured to wirelessly receive energy intended to operate a load 6 (e.g. a toilet seat ring heating, also called a toilet seat heating), which here represents a resistive load.

[0041] The above configuration essentially represents a DC-DC converter (with an insulating barrier to achieve a complete electrical isolation area between the input side and the output side), which can also be called an LLC converter (in addition to the primary coil L of the transformer, an additional coil L and capacitor C are provided), or a wireless power transfer converter (WPT converter).

[0042] According to the present invention, the transmitter 2 is configured to vary, in particular reduce, the energy transmitted to the secondary resonant circuit 5 over a predetermined period of time. To this end, the transmitter 2 includes a control device 9 configured to clock the input voltage supplied to the transmitter 2 by pulse duration modulation (PDM), for example at a frequency of 100 kHz. By changing the duty cycle of the PDM, the control device 9 can adjust the energy transmitted to the secondary resonant circuit 5; i.e., the transmitted energy can be proportionally reduced by reducing the duty cycle. Such reductions in transmitted energy are temporary. The receiver 4 is therefore configured to determine the value of an intended target parameter based on the period over which the energy transmitted by the transmitter 2 is varied. For example, the intended target parameter may relate to a desired temperature for the toilet seat ring heater 6 acting as a load, and a reduction in transmitted energy over a period of 150 ms may mean that the desired temperature is 30°C.

[0043] For this purpose, the receiver 4 is provided with a measuring device 7 having a shunt 8, by means of which the change in energy supplied to the toilet seat ring heating 6 during a given period of time can be measured. In other words, the energy transmitted to the toilet seat ring heating 6, which acts as a load, can be manipulated in the transmitter 2 using PDM at the resonant transmission frequency. As a result, the primary resonant circuit 3 is operated in a resonant state, causing an active current to flow, which generates a voltage in the shunt 8 that is proportional to the active current and corresponds to the load current.

[0044] The energy transmission system 1 according to the first exemplary embodiment allows communication from a transmitter 2 to a receiver 4 .

[0045] FIG. 2 shows a schematic diagram of a second exemplary embodiment of an energy transmission system 1 according to the invention, which also comprises a first device 2, also called a transmitter, and a second device 4, also called a receiver.

[0046] In this case, a resonance control device 10 is also provided in the second device 4, which is configured to connect or disconnect at least one resonance-determining capacitor 11 in the secondary resonant circuit 5. In this way, the active current in the primary resonant circuit 3 can be reduced. For this purpose, a measuring device 12 having a shunt 13 is further provided on the transmitter side, which is configured to detect the voltage drop across the shunt 13. Since the second device 4 is equipped with a resonance control device 10 which can, for example, reduce the energy transmitted by the first device 2 over a predetermined period of time, the achievement of the target parameter is transmitted to the first device 2.

[0047] In other words, the receiver 4 can transmit information to the transmitter 2 by reducing the energy received. When the receiver 4 reduces the energy received, the effective current in the primary resonant circuit 3 decreases and the voltage across the shunt 13 decreases accordingly.

[0048] In this case, the measuring device 12 of the transmitter 2 can evaluate the absolute current and / or the duration (in the case of a temporary reduction in the energy transmitted by the receiver 4) as part of the current measurement thus performed. The receiver 4 therefore reduces the energy received from the transmitter 2 by modifying the secondary resonant circuit 5. This means that the received energy is reduced not by changing the load but by modifying the resonance of the secondary resonant circuit 5. As mentioned above, for this purpose the receiver 4 modifies the secondary resonant circuit 5 by connecting or disconnecting at least one resonance-determining capacitor 11.

[0049] By additionally providing a resonance control device 10 on the receiver side, the receiver 4 can thus also transmit information to the transmitter 2, allowing two-way communication.

[0050] In this case, referring to FIG. 2, a resonance control device 10 is provided in the second device 4 which functions as a receiver in addition to the functions of the first device 2, although this is not a limitation of the invention.

[0051] Similarly, the first device 2 may not be configured to vary the energy transmitted to the secondary resonant circuit 5 over a predetermined period of time, and the second device 4 may not be configured to determine the value of the intended target parameter based on this period over which the transmitted energy is varied. Alternatively, without these features, the second device 4 may simply include a resonance control device 10 configured to connect or disconnect at least one resonance-determining capacitor (11) in the secondary resonant circuit 5 to reduce the active current in the primary resonant circuit 3. In such a case, the first device 2 would be referred to as a receiver and the second device 4 would be referred to as a transmitter, and unidirectional communication from the second device 4 to the first device 2 may occur.

[0052] Such unidirectional communication from the second device 4 to the first device 2 is conditional on the presence of a valid current in the primary resonant circuit.

[0053] As soon as there is an active current in the primary resonant circuit 3, information can be transmitted from the second device 4 to the first device 2. Detection of a person or user, performed by a proximity sensor in the toilet bowl, can serve as a trigger event for supplying active current. When a person or user is detected, current is supplied to the primary resonant circuit. The second device 4 is then activated or woken up by the first device 2 by transmitting energy. At this point, the first device 2 begins measuring the voltage drop across the shunt in the first device 2. Now, as the second device 4 reduces the active current for a predetermined period of time, the first device 2 can measure the duration for which the active current was reduced. In this way, one-way communication from the second device 4 to the first device 2 can be achieved.

[0054] For example, the one-way communication may occur at a predetermined time. Alternatively or additionally, such one-way communication may occur after an event detected by a sensor (not shown) located in or on the second device 4.

[0055] As mentioned above, the first reduction can also be used as the start bit for a sequence of, for example, eight further reductions within a given time grid, thus allowing the transmission of one byte (1 byte = 8 bits, equivalent to 8 reductions).

[0056] FIG. 3 shows a flow chart of an exemplary embodiment of a communication from a first device 2, also called a transmitter, to a second device 4, also called a receiver, according to the method according to the invention.

[0057] In a first method step S10 of the energy transmission method for sanitary equipment, energy is transmitted from the primary resonant circuit 3 of the transmitter 2 to the secondary resonant circuit 5 of the receiver 4, which is coupled to the primary resonant circuit 3. The transmitted energy can be used, for example, to supply energy for the operation of a load 6 (e.g., a toilet seat ring heating) provided in the toilet seat.

[0058] The energy transfer in method step S10 is essentially constant. For example, the input voltage supplied to the transmitter 2 may be clocked at 100 kHz, for example by a PDM, and supplied to the primary resonant circuit 3. Thus, if a resistive load, for example a toilet seat ring heater 6, is provided in the loosely coupled secondary resonant circuit 5 of the receiver 4, a sinusoidal active current will flow in the primary resonant circuit 3 of the transmitter 2.

[0059] Thereafter, in a second method step S20, the transmitter 2 varies, for example decreases, the energy transmitted to the secondary resonant circuit 5 over a predetermined period of time.

[0060] This temporary or intermittent change may, for example, involve reducing the energy transmitted by the transmitter 2 in method step S21 over a predetermined period of time. To this end, a timer is started in method step S22 and is continuously checked on the transmitter side in method step S23 until the current value of the timer reaches the value set by the predetermined period. The timer is then stopped in method step S24, after which the transmitted energy is increased again in method step S25 according to the original level in method step S10.

[0061] On the receiver side, the period during which the transmitted energy has been varied is obtained according to method step S30. This process is carried out at least partly in parallel with method step S20, in which the transmitter 2 varies the energy transmitted to the secondary resonant circuit 5 over a predetermined period. In particular, for this purpose, a step is provided for continuously checking the energy received by the receiver 4 according to method step S31. If the receiver 4 detects a negative deviation in the received energy, a timer is started in method step S32. The receiver 4 continues to continuously check the received energy.

[0062] If the receiver 4 subsequently detects a positive deviation in the received energy, it can be inferred that the temporary decrease in the energy level has been stopped again. The timer can therefore be stopped in method step S33. Based on the time the timer was started and the time the timer was stopped, a period, for example a period of 200 ms, can be obtained on the receiver side in method step S34.

[0063] This obtained time period is then used in method step S40 to determine the value of the intended target parameter at the receiver side. For example, the intended target parameter may relate to the desired temperature of the toilet seat ring heating 6, and a measurement of a time period of 200 ms may mean that the desired temperature is 32°C. This information is transmitted from the transmitter 2 to the receiver 4.

[0064] FIG. 4 shows a flow chart of an exemplary embodiment of a communication from a second device 4, also called receiver, to a first device 2, also called transmitter, according to the method according to the invention.

[0065] In the first method step S50, the receiver 4 first notifies the transmitter 2 that the transmitted energy should be reduced. For this purpose, a resonance control device 10 is provided on the receiver side, which connects or disconnects at least one resonance-determining capacitor 11 in the secondary resonant circuit 5 in order to reduce the active current in the primary resonant circuit 3.

[0066] Method step S50 may be performed, for example, at a predetermined time. Alternatively or additionally, method step S50 may be performed or triggered after an event detected by a sensor provided in or on the second device 4. In this way, information can be transmitted from the second device 4 to the first device 2 regardless of whether information has previously been transmitted from the first device 2 to the second device 4.

[0067] However, method step S50 may also be provided in response to the receiver 4 being successfully notified by the transmitter 2 about the desired temperature level of the seat ring heating 6. In other words, in such a case, the communication from the receiver 4 to the transmitter 2 may serve as a confirmation. Furthermore, if an error or problem with a load, such as the seat ring heating 6, is detected on the receiver side, a predetermined error code may be reported to the transmitter 2.

[0068] For this purpose, in method step S60, the transmitter 2 determines the period during which the received energy has been varied by the receiver 4. For this purpose, a step of continuously checking the transmitted energy in method step S61 is provided, thus detecting, by using the resonance control device 10, whether the active current in the primary resonant circuit 3 has been manipulated by the receiver. Explicitly excluded from such detection are cases where the transmitter 2 itself is responsible for a temporary variation in the transmitted energy in order to transmit information to the receiver 4. To determine the voltage drop, the measuring device 12 of the transmitter 2 is equipped with a shunt 13 that enables such detection.

[0069] As soon as the transmitter 2 detects that there is a change in the energy transmitted to the receiver 4 that was not initiated by the transmitter 2 itself, a timer is started according to method step S62. The transmitted energy is continuously monitored at the transmitter side.

[0070] When the transmitter 2 detects that the transmitted energy is increasing again to eventually return to the original energy level, the timer is stopped in method step S63. Based on the time the timer is started and the time the timer is stopped, a period can be determined at the transmitter side in method step S64.

[0071] Alternatively or additionally, according to method step S70, the absolute value of the voltage change may be determined on the transmitter side by the measuring device 12. The time period determined in method step S60 and / or the voltage change determined in method step S70 are then used in method step S80 to enable the transmitter 2 to receive the information communicated by the receiver 4.

[0072] By combining the period and voltage change, a large amount of different information (I1 to I 25 ), which is shown as an example in the table below.

[0073] [Table 1]

[0074] Thus, by combining five different periods with five different voltage reductions, 25 different pieces of information can be transmitted to the transmitter 2, such as feedback from the receiver 4 or predefined error codes.

[0075] It is also possible for several identical voltage reductions occurring successively in time to form one piece of information.

[0076] The drawings described above and the exemplary embodiments described in connection with the drawings are intended to be illustrative of the invention only and are not intended to be limiting of the invention. [Explanation of symbols]

[0077] 1. Energy transmission system 2. A first device, e.g., a transmitter 3 Primary resonant circuit 4. Second device, e.g., receiver 5 Secondary resonant circuit 6 Load, e.g. toilet seat ring heating 7. Second device measuring device 8 Shunt 9. Control device for first device 10 Resonance control device of second device 11 Resonance determining capacitor 12. First device measuring device 13 Shunt S10 Method step (first device) S20-S25 Method Steps (First Device) S30 to S34 Method Steps (Second Device) S40 Method step (second device) S50 Method Step (Second Device) S60 to S64 Method Steps (First Device) S70 Method Step (First Device) S80 Method Step (First Device)

Claims

1. An energy transmission system (1) for a sanitary installation, in particular a toilet, comprising: a first device (2) having a primary resonant circuit (3); a second device (4) coupled to the primary resonant circuit (3) and having a secondary resonant circuit (5) configured to wirelessly receive energy intended for operation of a load (6); the first device (2) is configured to vary the energy transferred to the secondary resonant circuit (5) over a predetermined period of time; The second device (4) is configured to determine a value of an intended target parameter based on the period during which the transmitted energy is varied.

2. The energy transmission system (1) of claim 1, wherein the change in the transmitted energy over the predetermined period of time comprises decreasing the transmitted energy.

3. 3. The energy transmission system (1) according to claim 1 or claim 2, wherein the second device (4) comprises a measuring device (7) having a shunt (8), by means of which the change in the energy supplied to the load (6) during the predetermined period can be measured.

4. 4. The energy transfer system (1) according to any one of claims 1 to 3, wherein the first device (2) comprises a control device (9) configured to clock an input voltage supplied to the first device (2) by pulse duration modulation (PDM).

5. 5. The energy transfer system (1) according to claim 4, wherein the control device (9) is configured to adjust the energy transferred to the secondary resonant circuit (5) by varying the duty cycle of the PDM.

6. The energy transmission system (1) according to any one of claims 1 to 5, wherein the first device (2) comprises a timer capable of controlling the predetermined period of time.

7. 7. The energy transfer system (1) according to claim 6, wherein the timer is configured to control a number of predetermined time periods associated with different values ​​of the intended target parameter.

8. 8. The energy transfer system (1) according to claim 7, wherein values ​​in the range of 100-300 ms are provided as the plurality of predetermined periods, in particular 100 ms, 150 ms, 200 ms, 250 ms and 300 ms.

9. The energy transmission system (1) according to any one of claims 1 to 8, wherein the second device (4) is configured to reduce the transmitted energy.

10. An energy transmission system (1) for a sanitary installation, in particular a toilet, comprising: a first device (2) having a primary resonant circuit (3); a second device (4) coupled to the primary resonant circuit (3) and having a secondary resonant circuit (5) configured to wirelessly receive energy intended for operation of a load (6); The second device (4) comprises a resonance control device (10) configured to connect or disconnect at least one resonance-determining capacitor (11) in the secondary resonant circuit (5) to reduce the active current in the primary resonant circuit (3).

11. 11. The energy transmission system (1) according to claim 10, wherein the first device (2) comprises a measuring device (12) having a shunt (13), the measuring device (12) being configured to detect a voltage drop across the shunt (13).

12. Sanitary facilities, in particular toilets, A toilet comprising a toilet bowl, a toilet seat, and an energy transmission system (1) according to any one of claims 1 to 11, A sanitary installation, in particular a toilet, wherein the first device (2) is arranged in or on the toilet bowl and the second device (4) is arranged in or on the toilet seat.

13. 1. A method of energy transmission for a sanitary installation, comprising: a step (S10) of transferring energy from a primary resonant circuit (3) of a first device (2) to a secondary resonant circuit (5) of a second device (4), said secondary resonant circuit (5) being coupled to said primary resonant circuit (3); Varying (S20) the energy transferred by the first device (2) to the secondary resonant circuit (5) over a predetermined period of time; A step (S30) of obtaining the period during which the transmitted energy is varied by the second device (4); determining (S40) by said second device (4) a value of an intended target parameter based on said acquired time period; A method comprising:

14. 14. The method of claim 13, a step (S21) of reducing the transmitted energy by the first device (2); Starting the timer (S22); continuously checking whether the current value of the timer has reached the predetermined period (S23); Stopping the timer (S24); Increasing the transmitted energy (S25); The method further comprises:

15. 15. The method of claim 13 or claim 14, a step (S31) of continuously checking the energy received by the second device (4); starting a timer when a negative deviation of the received energy is detected (S32); Stopping the timer when a positive deviation in the received energy is detected (S33); Obtaining a period between the start of the timer and the stop of the timer (S34); The method further comprises:

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