Inductively chargeable hearing device and charging device

Abstract

A system comprising a hearing device and a charging device is disclosed. The charging device is configured for accommodating the hearing device and is further configured for inductively charging the hearing device. The hearing device comprises a rechargeable battery arranged in connection with a receiver coil. The receiver coil is arranged in a hearing device housing. The receiver coil comprises a magnetic core and a metal winding wound around the magnetic core. The charging device comprises at least one transmitter coil arranged in a charging device housing. The transmitter coil comprising the metal winding is configured for charging the hearing device. When the hearing device is accommodated in the charging device, the transmitter coil is arranged to at least partially enclose the receiver coil.

Description

Technical Field

[0001] This invention relates to inductively rechargeable hearing devices. More specifically, this disclosure relates to a system comprising an inductively rechargeable hearing device and a charging device. In particular, this disclosure relates to a hearing device configured to be inductively charged via the charging device. Background Technology

[0002] Traditional hearing aids often require frequent battery replacements or cumbersome wired charging systems, which can be inconvenient for users. Over the past few years, rechargeable batteries have been replacing traditional batteries. In some cases, these rechargeable batteries are removed from the hearing aid and charged using an external charger. Alternatively, hearing aids containing rechargeable batteries can be housed in a casing to charge the rechargeable batteries within the hearing aid itself. However, this charging method is often time-consuming and inefficient due to poor coupling between the charging mechanism within the casing and the hearing aid.

[0003] Therefore, an improved charging method is needed to ensure that the rechargeable batteries of hearing devices can be charged quickly and efficiently. Summary of the Invention

[0004] For an effective inductive charging system to be successful, the charging coil must have a high Q value and be highly efficient. Furthermore, the coupling between the coils is also crucial. A challenge facing hearing devices is that an effective coil requires a significant amount of space within the device, while the size of the device itself is highly limited.

[0005] Therefore, one object of the present disclosure is to provide a method for efficiently charging a hearing device using a charging device.

[0006] Another object of this disclosure is to provide an efficient charging system for both a hearing device and a charging device without affecting the size of either the charging device or the hearing device.

[0007] Another object of the embodiments of this disclosure is to provide a high Q value for a hearing device charging coil and a charging device coil.

[0008] Another object of the embodiments of this disclosure is to provide good coupling between the charging device coil and the hearing device coil.

[0009] According to a first aspect, a system including a hearing device and a charging device is provided. The charging device is configured to house the hearing device and is also configured to inductively charge the hearing device. The hearing device includes a rechargeable battery connected to a receiver coil. The receiver coil is disposed within a housing of the hearing device. The receiver coil includes a magnetic core and a metal winding wound around the magnetic core. The charging device includes at least one transmitter coil disposed within a housing of the charging device. The transmitter coil, including the metal winding, is configured to charge the hearing device. When the hearing device is housed within the charging device, the transmitter coil is arranged to at least partially surround the receiver coil.

[0010] Hearing devices can be audible devices, such as headphones, headphones, earbuds, hearing aids, personal sound amplification products (PSAPs), over-the-counter (OTC) hearing devices, hearing protection devices, standard-size hearing devices, custom-made hearing devices, or other head-mounted hearing devices. Hearing devices can include both prescription and over-the-counter devices.

[0011] Hearing devices can be configured to be worn by a user. The hearing device can be placed in, on, above, inside, or behind the ear, and / or in the concha of the user's ear; that is, the hearing device is configured to be worn in, on, above, or in, the user's ear. A user may wear two hearing devices, one in each ear. The two hearing devices can be connected, for example, wirelessly and / or via wires, such as in a binaural hearing aid system. The hearing device can be configured to communicate with one or more other devices, such as another hearing device, an accessory device, or a peripheral device.

[0012] Hearing devices can take various housing styles or shapes. Some of these shapes are behind-the-ear (BTE) hearing devices, in-the-canal (RIC) hearing devices, in-the-ear (RIE) hearing devices, or in-the-ear microphone and receiver (MaRIE) hearing devices. These devices can include BTE units configured to be worn behind a user's ear and in-the-ear (ITE) units configured to be partially or fully inserted into the user's ear canal. Typically, a BTE unit can include at least one input transducer, a power supply, and a processing unit. The term BTE hearing device refers to a hearing device in which the receiver (i.e., the output transducer) is contained within the BTE unit, and sound is directed to the ITE unit through a sound tube connecting the BTE and ITE units. The terms RIE, RIC, and MaRIE hearing devices refer to hearing devices in which the output transducer may be contained within an ITE unit, which is coupled to the BTE unit via a connecting cable or wire / tube configured to transmit electrical signals between the BTE and ITE units.

[0013] Some of these form factors are in-the-ear (ITE) hearing devices, completely-in-the-canal (CIC) hearing devices, or in-the-canal (IIC) hearing devices. These hearing devices may include an ITE unit, which may include at least one input transducer, a power supply, a processing unit, and an output transducer. These form factors can be custom-designed devices, meaning that the ITE unit may include a housing having a shell made of a rigid material (e.g., a rigid polymer or metal) or a soft material (e.g., a rubber-like polymer), molded to have an external shape that conforms to the shape of a particular user's ear canal.

[0014] Some of these are in-ear, over-ear, or earphone designs. Those skilled in the art are familiar with different types of hearing devices and various options for placing hearing devices inside, on, above, and / or at the ear of the hearing device wearer. Hearing devices (or a pair of hearing devices) can be custom-fit, standard-fit, open-fit, and / or closed-fit.

[0015] Hearing devices may include a hearing device antenna and a hearing device wireless communication unit. Hearing devices may be configured to perform wired / wireless audio communication, such as enabling a user to listen to media (e.g., music or radio) and / or enabling a user to make telephone calls.

[0016] The hearing device includes a rechargeable battery. The rechargeable battery may form part of the hearing device's power supply and / or charging circuitry. It is typically located inside the hearing device and configured to provide a first voltage to various components of the hearing device. The power supply and / or charging circuitry may include a power management unit, such as a hearing device power management unit. The hearing device power management unit may be configured to convert the first voltage to a second voltage. The power supply and / or charging circuitry may include a receiver charging element. The receiver charging element may be a receiver coil. The rechargeable battery may be a replaceable battery. The rechargeable battery is configured to be charged by a charging device. The charging device may begin charging the hearing device only after it is plugged into the charging device.

[0017] Hearing devices include a receiver coil. The receiver coil is located inside the hearing device, specifically within its housing. The housing typically contains other hearing device components. The receiver coil can be placed anywhere within the housing, but is usually close to a rechargeable battery. The rechargeable battery is connected to the receiver coil, and the receiver coil is typically directly connected to the rechargeable battery, for example, via a wire.

[0018] The receiver coil can be disposed in a portion of the hearing device housing configured to be positioned within the user's ear. Alternatively, the receiver coil can be disposed in an intraauricular portion of the hearing device housing configured to be at least partially housed within the user's ear canal or cymba conchae. Disposing the receiver coil in the intraauricular portion of the hearing device housing reduces the overall device size. Furthermore, disposing the receiver coil in the intraauricular portion of the hearing device allows for a hearing device without a stem.

[0019] The receiver coil includes a magnetic core and a metal winding wound around the magnetic core. In this context, the receiver coil including the core and the winding should be interpreted as follows: The magnetic core forms part of the receiver coil. The magnetic core defines a winding body around which the metal winding is wound directly, thus forming an integral part of the receiver coil. The magnetic core is located inside the metal winding, rather than near the coil. The magnetic core forming part of the receiver coil is configured to help trap electromagnetic fields from the transmitter coil. The magnetic core is configured to increase the inductance of the receiver coil. Furthermore, the winding also contributes to the inductance of the receiver coil. Additionally, the metal winding and the magnetic core work together and contribute to the inductance of the receiver coil.

[0020] Typically, the receiver coil, including the magnetic core, extends along the central axis, with the coil winding directly wound around the magnetic core, so that the magnetic core is surrounded by the winding. Compared to an equivalent air-core winding, the magnetic core increases the inductance of the coil.

[0021] The magnetic core can be made of a ferromagnetic metal (e.g., iron) or a ferrimagnetic compound (e.g., ferrite). The core can be a rod-shaped core around which a metal winding is wound. The rod-shaped core can be a solid rod, i.e., a rod without a central hole running through it. The rod-shaped core can extend longitudinally along the central axis of the receiver coil, such that the metal winding is concentrically wrapped around the core. Typically, the core is not formed as a hollow structure, nor is it formed as a foil around which a winding can be wound. Typically, the core can be a solid ferrite rod.

[0022] The combination of a magnetic core and metal windings ensures increased inductance and a high Q value in the receiver coil, resulting in high coupling efficiency with the transmitter coil while keeping the receiver coil size to a minimum. Furthermore, the core-loaded windings ensure high inductance—several times higher than windings without a core. This high inductance also allows for miniaturization of the receiver coil. Additionally, the windings wound around the core do not need to be very long, as high inductance can be achieved with fewer turns thanks to the core. The core also acts as part of the coil and traps the magnetic field from the transmitter coil. This also allows for miniaturization of the receiver coil. It is important that the receiver coil be small, as it should occupy as little space as possible in the hearing device. Moreover, a smaller receiver coil makes it easier to arrange within the hearing device.

[0023] The magnetic core can be made of, for example, various materials made of NiZn ferrite and designed for different frequency ranges, or various materials made of manganese-zinc ferrite and designed for different frequency ranges with a relative permeability ranging from 100 to 20,000. Metal windings can be wound around the core such that they completely cover the core from bottom to top. Alternatively, the metal windings can partially cover the core, for example, only covering half of the core. The metal windings can be tightly wound around the core such that each winding is in contact with the adjacent winding. Alternatively, the metal windings can be formed in a spiral around the core such that adjacent windings are not in contact. The winding density, together with the length of the core, defines the total number of turns in the receiver coil. The Q value of the receiver coil typically depends on the number of turns and / or the magnetic core, its length, relative permittivity, and / or diameter.

[0024] A charging device is configured to house hearing devices so as to enable charging of the hearing devices. The charging device may include a cavity for housing the hearing devices, i.e., the hearing devices can be housed within a cavity formed in the charging device. The charging device may be a charging housing for the hearing devices. The charging device may also be referred to as a charger. The charging device may be configured to house one or more hearing devices and be able to charge these hearing devices simultaneously.

[0025] The charging device includes at least one transmitter coil. The transmitter coil is typically arranged inside the charging device housing. The transmitter coil also includes a metal winding. The transmitter coil is typically an air-core coil, meaning the metal winding has no magnetic core. The air-core coil defines an internal volume such that once the hearing device is placed in the charger, the hearing device, particularly the receiver coil, can be arranged within the volume formed by the air-core coil. A magnetic field is generated in the transmitter coil, received by the receiver coil, and converted into electrical energy to power the hearing device and its components. The transmitter coil, i.e., its metal winding, can have various cross-sections, such as elliptical, rectangular, circular, rhomboid, etc., as long as such cross-sections ensure that the transmitter coil at least partially surrounds the receiver coil when the hearing device is housed in the charging device. In other words, when the hearing device is in the charger, the receiver coil is at least partially arranged inside the transmitter coil. The transmitter coil forms a volume. When the hearing device is arranged in the charger, the receiver coil is at least partially located within said volume. In other words, only a portion of the magnetic core and typically only a portion of the winding may overlap with the said spatial volume.

[0026] In this context, the feature “at least partially surrounds” is used to describe the physical relationship between the transmitter coil and the receiver coil, and is intended to describe that the transmitter coil at least partially physically surrounds the receiver coil, that is, at least partially encircles the receiver coil, that is, at least partially surrounds the receiver coil in space, that is, the receiver coil is at least partially located within the transmitter coil, that is, when the hearing device is placed in the charger, the receiver coil is at least partially assembled within the transmitter coil.

[0027] In some implementations, the entire receiver coil can be placed within the transmitter coil, i.e., within the spatial volume defined by the transmitter coil. The transmitter coil can be understood as a solenoid that generates the magnetic field to which the receiver coil can couple. When current flows through the solenoid, a uniform field, i.e., a uniform magnetic field, is generated within the spatial volume defined inside the solenoid. Therefore, the receiver coil can be placed anywhere within the solenoid and will experience the same magnetic field. Furthermore, at least one additional receiver coil can be placed within the solenoid, and both receiver coils will be coupled to the magnetic field of the transmitter coil. This provides flexibility in designing both the charger and the hearing device.

[0028] According to this disclosure, when the hearing device is placed in the charger, the transmitter coil at least partially surrounds the receiver coil. The greater the overlap between the receiver coil and the spatial volume defined by the transmitter coil, the higher the coupling efficiency of the magnetic field. Coupling efficiency is maximized when the entire receiver coil is surrounded by the transmitter coil and the central axes of the coils are parallel, thereby maximizing the induced charging of the receiver coil.

[0029] By placing at least a portion of the receiver coil inside the transmitter coil, the receiver coil is ensured to be coupled into the electromagnetic field of the transmitter coil, thereby ensuring the transmission of the electromagnetic field and charging the hearing device. Preferably, the hearing device can be charged when at least 10% of the receiver coil is surrounded by the transmitter coil.

[0030] Typically, a charging device includes one or more supports configured to accommodate one or more hearing devices during charging. The charging device may include a single transmitter coil arranged to at least partially surround the support, and thereby surround the receiver coil of one or more hearing devices, regardless of the exact position of the hearing device within the support. The receiver coil may be arranged within the intra-ear portion of the hearing device, and the support may be formed to typically accommodate the intra-ear portion of the hearing device. In this way, the hearing device does not need to be placed in a predetermined orientation or a cavity of a specific shape, but can be freely positioned within the support, while still ensuring efficient inductive coupling between the transmitter coil of the charging device and the receiver coil of the hearing device due to the uniform electromagnetic field within the transmitter coil. Therefore, the support can be formed with a simple cavity, ensuring only that the hearing device is accommodated and held during charging, without requiring precise alignment features or dedicated mating structures to match the external shape of the hearing device. This configuration simplifies charger design, reduces the need for precise mechanical tolerances, and allows the same charger design to be used for different hearing device models, thereby helping to reduce manufacturing costs while still providing reliable and efficient charging performance.

[0031] The charging device can be plugged into a power outlet to charge the hearing device. Alternatively, the charging device can be configured to store electricity and then transfer it to the hearing device after charging begins. The charging device can be configured to accommodate two hearing devices and be able to charge them simultaneously or alternately. In any of these implementations, the charging device is configured to inductively charge the hearing device, i.e., wirelessly charge it via electromagnetic induction, allowing energy transfer from the charger to the hearing device without direct electrical contact. Charging relies on an electromagnetic field that transfers power between the charging device and the hearing device, particularly between the transmitter coil and the receiver coil.

[0032] The charging device may include a charging circuit. The charging circuit may include a power management unit. The power management unit may be configured to convert a third voltage into a first voltage, wherein the third voltage is received by the charging device, and the first voltage is provided by the charging device to the hearing device.

[0033] In an embodiment, the hearing device may include one or more input transducers. The one or more input transducers may include one or more microphones. The one or more input transducers may include one or more vibration sensors configured to detect bone vibrations. The one or more input transducers may be configured to convert an acoustic signal into a first electrical input signal. The first electrical input signal may be an analog signal. The first electrical input signal may be a digital signal. The one or more input transducers may be coupled to one or more analog-to-digital converters configured to convert the analog first input signal into a digital first input signal.

[0034] In an embodiment, the hearing device may include a processing unit. The processing unit may be configured to process a first and / or a second electrical input signal. The processing may include compensating for the user's hearing loss, i.e., applying a frequency-related gain to the input signal based on the user's frequency-related hearing impairment. The processing may include performing feedback cancellation, beamforming, tinnitus mitigation / masking, noise reduction, noise cancellation, speech recognition, bass adjustment, treble adjustment, and / or user input processing. The processing unit may be a processor, integrated circuit, application program, functional module, etc. The processing unit may be implemented in a signal processing chip or a printed circuit board (PCB). The processing unit may be configured to provide a first electrical output signal based on the processing of the first and / or second electrical input signals. The processing unit may be configured to provide a second electrical output signal. The second electrical output signal may be based on the processing of the first and / or second electrical input signals.

[0035] In an embodiment, the hearing device may include an output transducer. The output transducer may be coupled to a processing unit. The output transducer may be a receiver. Note that herein, the receiver may be a speaker, and a wireless receiver may be a device configured to process wireless signals. The receiver may be configured to convert a first electrical output signal into an acoustic output signal. The output transducer may be coupled to the processing unit via a magnetic antenna. The output transducer may be included in the ITE unit or earpiece of the hearing device, such as an in-ear receiver (RIE) unit or an in-ear microphone and receiver (MaRIE) unit. One or more input transducers may be included in the ITE unit or earpiece.

[0036] In one embodiment, the hearing device may include a wireless communication unit configured to convert an electrical output signal into a wireless output signal. The wireless output signal may include synchronization data. The hearing device's wireless communication unit may be configured to transmit the wireless output signal via at least one of one or more hearing device antennas.

[0037] In embodiments, the hearing device may include a vent. A vent is a physical channel, such as a channel or tube primarily housing a conduit for providing pressure equalization on a housing placed in the ear (e.g., an ITE hearing device, an ITE unit of a BTE hearing device, a CIC hearing device, a RIE hearing device, a RIC hearing device, a MaRIE hearing device, or an earmold / earplug). The vent may be a pressure vent with a small cross-sectional area, preferably acoustically sealed. The vent may be an acoustic vent configured for occlusion cancellation. The vent may be an active vent capable of opening or closing during use of the hearing device. An active vent may include a valve.

[0038] In an embodiment, the hearing device may include memory, including memory in volatile and non-volatile forms.

[0039] When a current is fed to the transmitter coil, the transmitter coil generates a magnetic field. This magnetic field is essentially a solenoid-like field that passes through the center of the transmitter coil along its longitudinal axis and loops back around its exterior. The receiver coil can be at least partially confined within the transmitter coil's magnetic field. Specifically, the receiver coil at least partially overlaps with the field lines passing through the transmitter coil. By confining the receiver coil at least partially within the transmitter coil's magnetic field, the transmitter coil's magnetic field induces a current in the receiver coil. This achieves charging of the hearing device. Depending on the percentage of confinement, i.e., the extent of overlap between the receiver and transmitter coil's magnetic fields, the coupling efficiency varies, and thus the rate of induced charging in the receiver coil also varies. Generally, a greater overlap results in higher coupling efficiency and thus a faster charging speed.

[0040] When the hearing device is housed in a charger, the entire receiver coil can be arranged inside the transmitter coil. To optimize coupling efficiency, the receiver coil can be arranged within the hearing device such that the entire receiver coil is surrounded by the transmitter coil when the hearing device is housed in the charging device. In this implementation, the entire receiver coil is physically surrounded by the transmitting magnetic field, allowing it to be optimally coupled to the transmitting magnetic field. The central axis of the receiver coil extends along the length of the coil, typically along the length of the magnetic core. The transmitter coil also has a central axis that passes through the center of the coil and extends along the longitudinal dimension of the coil. The two central axes can be parallel to each other, in which case the coupling of the magnetic fields of the receiver coil and the transmitter coil is maximized. In some implementations, the two central axes may not be parallel to each other, which typically sacrifices coupling efficiency.

[0041] The transmitter coil can be an air-core coil. In this context, the term air-core coil should be interpreted as a coil whose winding contains only air, i.e., the holes inside the coil have no magnetic core. By omitting the core from the transmitter coil, more space is available for arranging the receiver coil within the transmitter coil. The winding is typically a tightly wound bundle of insulated wires, i.e., each turn of wire can contact the adjacent wire. By tightly packing the winding, more turns can be achieved in a smaller space. Therefore, space in the charger is optimized while the Q value is maximized. Furthermore, the tightly packed winding can provide higher coupling with the receiver coil, thereby improving coupling efficiency and thus speeding up charging.

[0042] The transmitter coil typically has a diameter that can be measured perpendicular to its central axis, i.e., the longitudinal central axis. Similarly, the diameter of the receiver coil can be defined and can be measured perpendicular to its central axis. Typically, the diameter of the transmitter coil is larger than the diameter of the receiver coil. The diameter of the transmitter coil can be at least five times the diameter of the receiver coil. For example, the diameter of the transmitter coil can be approximately 20 mm, while the diameter of the receiver coil can be approximately 4 mm. The diameter of the transmitter coil can be at least ten times the diameter of the receiver coil. For example, the diameter of the transmitter coil can be approximately 20 mm, while the diameter of the receiver coil can be approximately 2 mm. The diameter of the transmitter coil can be at least twenty times the diameter of the receiver coil. For example, the diameter of the transmitter coil can be approximately 20 mm, while the diameter of the receiver coil can be approximately 1 mm. In embodiments where the transmitter coil is arranged to surround two hearing devices inserted into the charger, the diameter of the transmitter coil can be greater than 40 mm. By making the diameter of the transmitter coil significantly larger than the diameter of the receiver coil, it is ensured that the receiver coil can be at least partially surrounded by the transmitter coil and the hearing device inserted into the cavity of the charging device. The exceptionally large enclosed volume (especially with an exceptionally large transmitter coil cross-section) results in high coupling efficiency with the hearing device, i.e., high coupling efficiency with the receiver coil winding wound on the magnetic core.

[0043] The transmitter coil typically has a height that can be measured along its central axis. Similarly, the height of the receiver coil can be defined and measured along its central axis. Generally, the height of the transmitter coil is greater than the height of the receiver coil. The transmitter coil height can be at least 1 mm longer than the receiver coil height; for example, the transmitter can be 10 mm taller while the receiver coil is 7 mm taller, or only 6-5 mm taller, such as 5.7 mm. By making the transmitter coil significantly taller than the receiver coil height, it can be ensured that the receiver coil is completely surrounded by the transmitter coil.

[0044] The core of the receiver coil can be characterized by its diameter measured perpendicular to its central axis and its height measured along its central axis. The ratio of the core diameter to its height can be at least 1:1.5. In other words, the core, and therefore the receiver coil, is typically taller than it is wide. The diameter of the receiver coil can be 4 mm, and its height approximately 7 mm. It can even be as small as 2 mm in diameter and approximately 6 mm in height. It has also been calculated that even a receiver coil as small as 1 mm in diameter and approximately 5.7 mm in height can provide satisfactory coupling and charging efficiencies. Since hearing devices are typically small, it is advantageous to make the receiver coil as small as possible. Since the core typically defines the number of turns and the overall size of the receiver coil, by making the diameter of the core smaller than its height, the receiver coil can be made small enough while still allowing for a large number of turns to ensure high charging efficiency. However, a large number of turns is not necessary because the core itself improves the Q value of the receiver coil, even without a large number of turns.

[0045] The transmitter coil can be characterized by its diameter measured perpendicular to its central axis (i.e., the longitudinal central axis) and its height measured along the central axis. Typically, the ratio of the transmitter coil's diameter to its height can be at least 1:1, such as 1.5:1, or even 2:1. The diameter and height of the transmitter coil can both be 15 mm. Alternatively, the diameter can be 20 mm and the height 10 mm. Another option is a 30 mm diameter and a 10 mm height. By making the transmitter coil's diameter larger than its height, the charger and its cavity for housing the hearing device can be designed with greater flexibility. A high Q value can still be maintained through dense winding.

[0046] When the hearing device is housed within a charging device, the transmitter coil and receiver coil can be concentric. In other words, the two coils can share the same center point. However, the two coils can be tilted relative to each other. When the hearing device is housed within a charging device, the transmitter coil and receiver coil can be coaxial. In other words, the two coils can share the same central axis. Different mutual orientations between the two coils allow for optimization of the size and design of both the hearing device and the charging device, while still ensuring high charging efficiency. However, it should be noted that the receiver coil can take any orientation relative to the transmitter coil, as long as it at least partially overlaps with the transmitter coil.

[0047] When a hearing device is housed within a charging device, the central axes of the transmitter coil and the receiver coil can form an angle. This angle can range from 0 to 90 degrees. This relative tilt angle typically affects the coupling efficiency between the two coils, thus affecting the charging of the receiver coil. It should be noted that the overlap of the coils and the relative positioning (i.e., tilting and placement) of the receiver coil relative to the transmitter coil are degrees of freedom that can be manipulated to optimize charging efficiency without affecting the dimensions of the hearing device or the charging device.

[0048] The ratio between the transmitter coil winding and the receiver coil winding can be 1:1, such as 2:1, or even 3:1. In other words, the transmitter coil will have at least the same, and usually more, number of turns than the receiver coil. This ensures that the transmitter coil can completely surround the receiver coil. A turns ratio greater than 1:1 generally helps reduce losses in the transmitter coil. However, by selecting different winding densities, it is also possible to achieve a receiver coil with more turns than the transmitter coil.

[0049] The operating frequency range of the transmitter and receiver coils can be from 100 kHz to 20 MHz. The operating frequency can be 13.6 MHz. The operating frequency can be 135 kHz. The Q value of the coil can depend on the operating frequency. The choice of operating frequency can depend on the material of the magnetic core used for the receiver coil. Furthermore, the operating frequency can also be selected based on the material of the windings used for both the transmitter and receiver coils. Additionally, the operating frequency for charging can be selected in conjunction with any possible additional uses of the charging coil.

[0050] Hearing devices can be hearing aids. Hearing aids can be any type known in the art, such as behind-the-ear (BTE) hearing aids, in-the-ear (ITE) hearing aids, in-the-ear receiver (RIE) hearing aids, etc. As is known in the art, hearing aids are very small devices, and special care must be taken in designing each component of a hearing aid. The receiver coil according to this disclosure ensures efficient wireless charging of the hearing aid without compromising its small size.

[0051] The transmitter coil can be configured to transmit data to a hearing device. In other words, the transmitter coil can serve a dual purpose: charging the hearing device by transferring energy to its receiver coil, and transmitting data to one of the hearing device's antennas. The transmitter coil can operate at a single frequency, performing both charging and data transmission to the hearing device at that single operating frequency. Alternatively, the transmitter coil can be configured to operate at two different frequencies, one for data transmission and the other for charging. Having a multi-functional transmitter coil is advantageous to save space in the charger, thus improving its compactness. Furthermore, the ability to transmit data from the charger to the hearing device during charging is advantageous because the charger can, for example, have more storage memory for storing data related to the hearing device, such as data used for programming the hearing device. The transmitter coil can operate at 13.56 MHz, a frequency currently used for point-to-point communication between Bluetooth devices, and can also be used for charging the hearing device.

[0052] Hearing devices may include a receiver, such as a speaker. The receiver coil can be positioned close to the receiver. The receiver can be the receiver of a hearing aid, such as a BTE, ITE, or RIE hearing aid. The receiver coil can be placed below the receiver of the hearing device. Typically, there is available space near the receiver in the hearing device, so placing the charging coil close to the receiver can be advantageous. Because the receiver coil is substantially smaller than the receiver, it ensures that the receiver is not interfered with by the coil's magnetic field.

[0053] Some hearing aids include a telephone coil, which is typically located below the hearing aid receiver. As telephone coil technology has been phased out, the telephone coil in hearing aids can be replaced by a receiver coil used for inductive charging of the hearing aid.

[0054] The charging device may include a cover and a body. The cavity for housing the hearing device may be formed by both the cover and the body.

[0055] The transmitter coil can be arranged within the cover of the charging device. Alternatively, the transmitter coil can be arranged within the body of the charging device. Regardless of whether the transmitter coil is arranged within the cover or the body, according to this disclosure, the receiver coil of the hearing device is ensured to be at least partially surrounded by the transmitter coil.

[0056] The system may include a first hearing device and a second hearing device, such as a first hearing aid and a second hearing aid, or a first earplug and a second earplug.

[0057] The charging device may include a first cavity and a second cavity configured to respectively accommodate a first hearing device and a second hearing device. This allows for simultaneous charging of both hearing devices.

[0058] The charging device may include only one transmitter coil, arranged such that during charging (i.e., when the first and second hearing devices are housed in their respective cavities), the receiver coils of both are at least partially surrounded by the transmitter coil. The transmitter coil may be disposed within the cover or body of the charger. In another implementation, the charging device may include a first transmitter coil and a second transmitter coil, respectively, for charging the first and second hearing devices. Typically, the charging device for housing and charging two hearing devices is symmetrically structured, with one cavity located on one side of the axis of symmetry and the other on the other. The transmitter coil is typically arranged to surround the cavity. The transmitter coil may be disposed within the cover or body. This ensures that the transmitter coil at least partially surrounds the receiver coil disposed within the hearing device.

[0059] The receiver coil may include a thin ferrite core, for example, with a diameter as thin as less than 4 mm. The ferrite core may have windings wound around it. The charger's charging coil may have a diameter of approximately 20 mm to generate a high field for charging the receiver coil while maintaining good coupling with it. The coil can operate at an NFC frequency of 13.56 MHz. When the hearing device is a BTE hearing aid, the receiver coil can be placed below the receiver of the BTE device.

[0060] In one embodiment, the transmitter coil may have a diameter of approximately 20 mm and a height of approximately 10 mm. The receiver coil may have a diameter of approximately 4 mm and a height of approximately 7 mm. The relative permittivity of the magnetic core may be approximately 10,000. The operating frequency may be 135 kHz. Note that this embodiment may include the features described above in conjunction with the receiver coil and transmitter coil and their relative placement during charging of the hearing device.

[0061] In another embodiment, the transmitter coil may have a diameter of approximately 20 mm and a height of approximately 10 mm. The receiver coil may have a diameter of approximately 4 mm and a height of approximately 7 mm. The magnetic core may be made of ferrite material. The relative permittivity of the ferrite material may be approximately 120. The operating frequency may be 13.56 MHz. Note that this embodiment may include the features described above in conjunction with the receiver coil and transmitter coil and their relative placement during charging of the hearing device.

[0062] In another embodiment, the transmitter coil may have a diameter of approximately 20 mm and a height of approximately 10 mm. The receiver coil may have a diameter of approximately 2 mm and a height of approximately 5.7 mm. The relative permittivity of the magnetic core may be approximately 120. The magnetic core may be made of ferrite material. The operating frequency may be 13.56 MHz. Note that this embodiment may include the features described above in conjunction with the receiver coil and transmitter coil and their relative placement during charging of the hearing device.

[0063] In yet another embodiment, the transmitter coil may have a diameter of approximately 20 mm and a height of approximately 10 mm. The receiver coil may have a diameter of only approximately 1 mm and a height of approximately 5.7 mm. The relative permittivity of the magnetic core may be approximately 120. The magnetic core may be made of ferrite material. The operating frequency may be 13.56 MHz. Note that this embodiment may include the features described above in conjunction with the receiver coil and transmitter coil and their relative placement during charging of the hearing device.

[0064] The embodiments disclosed herein offer high charging efficiency, while both coils, particularly the hearing device coil, are very small, ensuring better integration into existing hearing and charging devices. The charging device coil provides great flexibility regarding the exact placement of the hearing device during charging, thus providing improved usability of the charging system. It is also noteworthy that, since the receiver coil core can be as small as less than 4 mm in diameter, its impact on surrounding components of the hearing device is negligible.

[0065] The present invention relates to various aspects, including systems comprising hearing devices and charging devices, systems described above and below, and corresponding charging devices and methods for charging hearing devices in the charging devices, each aspect producing one or more benefits and advantages described in conjunction with the first mentioned aspects, and each aspect having one or more embodiments corresponding to the embodiments described in conjunction with the first mentioned aspects and / or the embodiments disclosed in the appended claims. Attached Figure Description

[0066] The above and other features and advantages will be readily understood by those skilled in the art from the following detailed description of exemplary embodiments, taken in conjunction with the accompanying drawings, wherein:

[0067] Figure 1 An exemplary embodiment of the system according to this disclosure is illustrated schematically.

[0068] Figure 2 An exemplary embodiment of the receiver coil and transmitter coil according to the present disclosure is illustrated schematically.

[0069] Figure 3 Another exemplary embodiment of the receiver coil and transmitter coil according to the present disclosure is illustrated schematically.

[0070] Figure 4 An exemplary embodiment of a hearing device according to the present disclosure is illustrated schematically.

[0071] Figure 5 An exemplary embodiment of the system according to this disclosure is illustrated schematically.

[0072] Figure 6 Another exemplary embodiment of the system according to this disclosure is illustrated schematically.

[0073] Figure 7 Another exemplary embodiment of the system according to this disclosure is illustrated schematically. Detailed Implementation

[0074] Various embodiments will now be described with reference to the accompanying drawings. Throughout the text, the same reference numerals refer to the same elements. Therefore, the same elements will not be described in detail for each drawing. It should also be noted that the drawings are intended only to facilitate the description of embodiments. They are not intended as an exhaustive description of the claimed invention or a limitation on the scope of the claimed invention. Furthermore, the illustrated embodiments do not necessarily possess all the aspects or advantages shown. The aspects or advantages described in connection with a particular embodiment are not limited to that embodiment and may be practiced in any other embodiment even if not so shown or so explicitly described.

[0075] Figure 1 An exemplary embodiment of system 2 according to this disclosure is schematically illustrated. System 2 includes a hearing device 4 and a charging device 6. The charging device 6 is configured to house the hearing device 4 and is also configured to inductively charge the hearing device 4. The hearing device 4 includes a rechargeable battery 8 disposed in connection with a receiver coil 10. The receiver coil 10 is disposed within a hearing device housing 12. The receiver coil 10 includes a magnetic core 14 and a metal winding 16 wound around the magnetic core 16. The charging device 6 includes at least one transmitter coil 18. The transmitter coil is generally disposed within the charging device housing. The transmitter coil 18 includes a metal winding 20. The transmitter coil 18 is configured to charge the hearing device. More specifically, the metal winding 20 of the transmitter coil 18 is configured to be electromagnetically coupled to the receiver coil of the hearing device, thereby enabling the charging of the hearing device 4. When the hearing device 4 is housed in the charging device 6, the transmitter coil 18 is arranged to at least partially surround the receiver coil 10.

[0076] Usually, such as Figure 1 As shown, the receiver coil 10 can be arranged in the portion of the hearing device housing configured to be positioned inside the user's ear. Arranging the receiver coil 10 in the in-ear portion of the hearing device housing typically reduces the overall device size. Furthermore, arranging the receiver coil in the in-ear portion of the hearing device allows the hearing device to exclude the stem (…). Figure 1 (Not shown in the image). The handle should be understood as the portion of the hearing device that extends outside the ear, typically forming an elongated structure extending from the portion of the outer shell configured to be positioned inside the user's ear. The handle can house various electronic components, such as a microphone, control circuitry, etc.

[0077] Figure 2An exemplary embodiment of the receiver coil and transmitter coil according to this disclosure is schematically illustrated. For simplicity, the hearing device and charging device are not shown. The transmitter coil 18 is an air-core coil, allowing for flexibility in the placement of the receiver coil. In this embodiment, when the hearing device is arranged in the charging device for charging, the receiver coil 10 is completely surrounded by the transmitter coil 18. A rechargeable battery 8 is connected to a winding 16 of the receiver coil wound around a magnetic core 14. The magnetic core 14 defines a winding body on which the metal winding 16 is wound directly, thereby forming an integral part of the receiver coil. The magnetic core 14 is shown as a solid rod. The transmitter coil 18 forms a solenoid and defines a spatial volume S inside the solenoid. When the hearing device is placed in the charger for charging, the receiver coil 10 is arranged inside the spatial volume S. Because the receiver coil 10 is completely surrounded by the transmitter coil 18, the height H of the magnetic core 14 is... R Typically less than (or at most the same as) the height H of the transmitter coil T Furthermore, the diameter D of the transmitter coil T Larger than the diameter D of the receiver coil R .exist Figure 2 In the example shown, the receiver coil is positioned approximately centrally within the transmitter coil, and the coils are substantially coaxial. In other examples, the receiver coil can be placed anywhere within the spatial volume S defined by the transmitter coil, because the magnetic field generated by the transmitter coil inside the solenoid is substantially uniform when current flows through the windings. Coupling between the coils is generally unaffected by the placement of the receiver coil inside the transmitter coil. Furthermore, the receiver coil can take other orientations inside the solenoid; that is, when the hearing device is housed in a charging device, the central axes of the transmitter coil and the receiver coil can form an angle ranging from 0 to 90 degrees.

[0078] exist Figure 2 In the example shown, the magnetic core 14 is only partially covered by the winding 16. The receiver coil winding 16 is tightly wound around the core. In other implementations, the magnetic core 14 may be completely covered by the winding. The winding may be tightly wound or may form a helical structure in which adjacent windings do not contact each other.

[0079] In some examples, the transmitter coil may accommodate more than one hearing device, i.e., more than one receiver coil. In other examples, the charging device may include more than one transmitter coil, each transmitter coil being configured to accommodate one hearing device, thereby accommodating one receiver coil.

[0080] The embodiments of this disclosure provide high charging efficiency thanks to the specific relative arrangement of the two coils and the combined contribution of the receiver coil's core and windings, which significantly improves the receiver coil's inductance and Q-factor. High charging efficiency is achieved while both coils, particularly the hearing device coil, are small, ensuring better integration into existing hearing and charging devices. The charging device coil 18 provides greater flexibility regarding the exact placement of the hearing device during charging, thus providing improved usability of the charging system. It is also noteworthy that, since the receiver coil's core can be as small as less than 4 mm in diameter, its impact on surrounding components of the hearing device is negligible.

[0081] The operating frequency range of the transmitter and receiver coils can be from 100 kHz to 20 MHz. The operating frequency can be 13.6 MHz. The operating frequency can be 135 kHz. The Q value of the coil can depend on the operating frequency. The choice of operating frequency can depend on the material of the magnetic core used for the receiver coil. The magnetic core 14 can be a ferrite rod. Furthermore, the operating frequency can also be selected based on the material of the windings used for both the transmitter and receiver coils. Additionally, the operating frequency for charging can be selected in conjunction with any possible additional uses of the charging coil.

[0082] Figure 3 Another exemplary embodiment of the receiver coil and transmitter coil according to this disclosure is schematically illustrated. To avoid repetition, we refer here to... Figure 2 And the description presented above. Besides combining... Figure 2 Beyond the characteristics of the explanation, Figure 3 An implementation is shown in which the receiver coil 10 is positioned close to the hearing device receiver 22 (e.g., a speaker). Typically, there is available space near the receiver for the hearing device, so placing the charging coil of the hearing device close to the receiver 22 can be advantageous. Since the receiver coil 10 is substantially smaller than the hearing device receiver 22, it is ensured that the receiver is not interfered with by the magnetic field of the coil 10.

[0083] Figure 4 An exemplary embodiment of a hearing device 4 according to the present disclosure is illustrated schematically. The hearing device 4 may be a hearing aid. The hearing device includes a rechargeable battery 8 connected to a receiver coil 10 positioned near the receiver 22 of the hearing device.

[0084] Figure 5 An exemplary embodiment of the system according to this disclosure is illustrated schematically. Figure 5 The image shows a charging device 6 containing a transmitter coil 18. Figure 4 The cross-section of a hearing device. From Figure 5As can be seen, the transmitter coil is typically configured to house at least a portion of the hearing aid and the receiver coil 10. The receiver 22 can be the receiver of a hearing aid, such as a BTE, ITE, or RIE hearing aid. Generally, there is available space near the receiver 22, so placing the receiver coil 10 of the hearing aid close to the receiver can be advantageous. Some hearing aids include a telephone coil, typically located below the hearing aid receiver. As telephone coil technology becomes obsolete, the telephone coil in a hearing aid can be replaced by the receiver coil 10 to enable inductive charging of the hearing aid. Figure 5 In the example shown, the receiver coil 10 is completely surrounded by the transmitter coil, that is, the receiver coil is placed in the space defined inside the transmitter coil 18 and its winding 20.

[0085] Figure 6 An exemplary embodiment of the system according to this disclosure is illustrated schematically. Figure 6 It shows the relationship with Figure 1 A similar system is shown, except that the charging device 6 is configured to house two hearing devices, a first hearing device 4A and a second hearing device 4B, each including a receiver coil and a battery 8. The transmitter coil 18 of the charging device is arranged to at least partially surround the receiver coils 10 of the first and second hearing devices. The charging device 6 includes a cover 6L and a body 6B, and the cavity for housing the hearing devices 4A and 4B is formed by both the cover 6L and the body 6B. Figure 6 In one example, the transmitter coil is arranged within the charging device body 6B, while the receiver coil 10 extends over both the body and the cover 6L when the hearing device is placed in the charger. The receiver coil 10 is located in the portion of the hearing devices 4A and 4B configured to be placed inside the user's ear. In another implementation, the transmitter coil 18 may be arranged within the cover 6L. In yet another implementation, the receiver coil 10 may be located in another portion of the hearing device, such as the stem of the hearing devices 4A and 4B. In yet another implementation, the receiver coil may be completely surrounded by the transmitter coil 18. In yet another implementation, the charging device may include two transmitter coils 18, a first transmitter coil arranged to at least partially surround the receiver coil 10 of the first hearing device 4A, and a second transmitter coil arranged to at least partially surround the receiver coil 10 of the second hearing device 4B.

[0086] Figure 7 Another exemplary embodiment of the system according to this disclosure is illustrated schematically. Figure 7System 2A is shown, comprising a charging device 6A configured to accommodate two hearing devices (a first hearing device 4C and a second hearing device 4D), each hearing device including a receiver coil and a battery (not shown). Each hearing device includes a portion configured to be placed inside a user's ear, and the receiver coil is disposed within this portion. A transmitter coil (also not shown) of the charging device is arranged such that it at least partially surrounds the receiver coils of the first and second hearing devices. The charging device 6A includes a cover 6L and a body 6B, and a support for accommodating the hearing devices 4C and 4D is formed in the body 6B. In this implementation, the hearing devices 4C and 4D do not need to be placed in a predetermined orientation but can be freely positioned within the support while still ensuring efficient inductive coupling between the transmitter coil of the charging device 6A and the receiver coils of the hearing devices 4C and 4D. Therefore, the support can be formed with a simple cavity that only ensures that the hearing devices are accommodated and held during charging, without requiring precise alignment features or dedicated mating structures that match the external shape of the hearing devices. This configuration simplifies the design of the 6A charger, reduces the need for precise mechanical tolerances, and allows the same charger design to be used for different hearing device models, thereby helping to reduce manufacturing costs while still providing reliable and efficient charging performance.

[0087] Although specific features have been shown and described, it should be understood that they are not intended to limit the claimed invention, and it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the scope of the claimed invention. Therefore, the specification and drawings should be considered illustrative rather than restrictive. The claimed invention is intended to cover all alternatives, modifications, and equivalents.

[0088] project:

[0089] 1. A system comprising a hearing device and a charging device, the charging device being configured to receive the hearing device and further configured to inductively charge the hearing device.

[0090] The hearing device includes a rechargeable battery disposed in connection with a receiver coil, the receiver coil being disposed within a housing of the hearing device, the receiver coil comprising a magnetic core and a metal winding wound around the magnetic core.

[0091] The charging device includes at least one transmitter coil, the transmitter coil including a metal winding configured to charge the hearing device;

[0092] When the hearing device is housed in the charging device, the transmitter coil is arranged to at least partially surround the receiver coil.

[0093] 1A. A system comprising a hearing device and a charging device, the charging device being configured to receive the hearing device and further configured to inductively charge the hearing device.

[0094] The hearing device includes a rechargeable battery disposed in connection with a receiver coil disposed within a hearing device housing. The receiver coil includes a magnetic core and a metal winding wound around the magnetic core. The hearing device housing includes a portion configured to be positioned within a user's ear, and the receiver coil is disposed within this portion of the hearing device housing configured to be positioned within the user's ear.

[0095] The charging device includes at least one transmitter coil, the transmitter coil including a metal winding configured to charge the hearing device;

[0096] Wherein, when the hearing device is housed in the charging device, the transmitter coil is arranged to at least partially surround the receiver coil.

[0097] 1B. The system according to item 1 or 1A, wherein the magnetic core defines a winding body, the metal winding is directly wound on the winding body, and the magnetic core thereby forms an integral part of the receiver coil.

[0098] 2. The system according to item 1-1B, wherein the transmitter coil generates a magnetic field, and wherein the receiver coil is at least partially confined within the magnetic field of the transmitter coil.

[0099] 3. The system according to item 1 or 2, wherein the entire receiver coil is arranged inside the transmitter coil.

[0100] 4. The system according to any one of the preceding items, wherein the transmitter coil is an air-core coil.

[0101] 5. The system according to any one of the preceding items, wherein the transmitter coil has a diameter measured perpendicular to its central axis, and the receiver coil has a diameter measured perpendicular to its central axis, and wherein the diameter of the transmitter coil is larger than the diameter of the receiver coil.

[0102] 6. The system according to any one of the preceding items, wherein the transmitter coil has a height measured along its central axis, and the receiver coil has a height measured along its central axis, and wherein the height of the transmitter coil is greater than the height of the receiver coil.

[0103] 7. The system according to any one of the preceding items, wherein the magnetic core has a diameter measured perpendicular to its central axis and a height measured along the central axis, and wherein the ratio of the diameter to the height is at least 1:1.5.

[0104] 8. The system according to any one of the preceding items, wherein the transmitter coil has a diameter measured perpendicular to its central axis and a height measured along the central axis, and wherein the ratio of the diameter to the height is 1:1.

[0105] 9. The system according to any one of the preceding items, wherein the transmitter coil and the receiver coil are concentric when the hearing device is housed in the charging device.

[0106] 10. The system according to any one of the preceding items, wherein when the hearing device is housed in the charging device, the central axis of the transmitter coil and the central axis of the receiver coil form an angle in the range of 0 to 90 degrees.

[0107] 11. The system according to any one of the preceding items, wherein the ratio between the transmitter coil winding and the receiver coil winding is 1:1.

[0108] 12. The system according to any one of the preceding items, wherein the operating frequency range of the transmitter coil and the receiver coil is 100 kHz to 20 MHz.

[0109] 13. The system according to any one of the preceding items, wherein the hearing device is a hearing aid.

[0110] 14. The system according to any one of the preceding items, wherein the transmitter coil is further configured to transmit data to the hearing device.

[0111] 15. The system according to any one of the preceding items, wherein the hearing device includes a receiver, and wherein the receiver coil is arranged in proximity to the receiver.

[0112] 16. The system according to any one of the preceding items, wherein the charging device includes a cover and a body, and wherein a cavity for receiving the hearing device is formed by both the cover and the body.

[0113] 17. The system according to item 16, wherein the transmitter coil is arranged in the cover or body of the charging device.

[0114] 18. The system according to any one of the preceding items, wherein the charging device includes a first cavity and a second cavity configured to respectively accommodate a first hearing device and a second hearing device.

[0115] 19. The system according to any one of the preceding items, wherein the charging device includes a first transmitter coil and a second transmitter coil configured to charge the first hearing device and the second hearing device, respectively.

[0116] List of reference numerals

[0117] 2, 2A System

[0118] 4. Hearing equipment

[0119] 4A, 4B First and second hearing devices

[0120] 4C, 4D First and second hearing devices

[0121] 6, 6A charging equipment

[0122] 6L charging device cover

[0123] 6B Charging Equipment Main Body

[0124] 8 rechargeable batteries

[0125] 10 Receiver Coil

[0126] 12 Hearing device casing

[0127] 14 magnetic cores

[0128] 16. Metal windings of the receiver coil

[0129] 18 transmitter coils

[0130] 20. Metal windings of the transmitter coil

[0131] 22 Hearing device receiver

Claims

1. A system comprising a hearing device and a charging device, the charging device being configured to receive the hearing device and further configured to inductively charge the hearing device. The hearing device includes a rechargeable battery disposed in connection with a receiver coil, the receiver coil being disposed within a housing of the hearing device, the receiver coil comprising a magnetic core and a metal winding wound around the magnetic core. The charging device includes a transmitter coil, which includes metal windings configured to charge the hearing device; in, When the hearing device is housed in the charging device, the transmitter coil is arranged to at least partially surround the receiver coil.

2. The system according to claim 1, wherein, The transmitter coil generates a magnetic field, and The receiver coil is at least partially confined within the magnetic field of the transmitter coil.

3. The system according to claim 1 or 2, wherein, The entire receiver coil is arranged inside the transmitter coil.

4. The system according to any one of the preceding claims, wherein, The transmitter coil is an air-core coil.

5. The system according to any one of the preceding claims, wherein, The transmitter coil has a diameter measured perpendicular to its central axis, and the receiver coil has a diameter measured perpendicular to its central axis. The diameter of the transmitter coil is larger than the diameter of the receiver coil.

6. The system according to any one of the preceding claims, wherein, The transmitter coil has a height measured along its central axis, and the receiver coil has a height measured along its central axis. The height of the transmitter coil is greater than the height of the receiver coil.

7. The system according to any one of the preceding claims, wherein, The magnetic core has a diameter measured perpendicular to its central axis and a height measured along the central axis, and Wherein, the ratio of the diameter to the height is at least 1:1.

5.

8. The system according to any one of the preceding claims, wherein, The transmitter coil has a diameter measured perpendicular to its central axis and a height measured along the central axis, and The ratio of the diameter to the height is 1:

1.

9. The system according to any one of the preceding claims, wherein, When the hearing device is housed in the charging device, the transmitter coil and the receiver coil are concentric.

10. The system according to any one of the preceding claims, wherein, When the hearing device is housed in the charging device, the central axis of the transmitter coil and the central axis of the receiver coil form an angle ranging from 0 to 90 degrees.

11. The system according to any one of the preceding claims, wherein, The transmitter coil and the receiver coil operate in a frequency range of 100kHz to 20MHz.

12. The system according to any one of the preceding claims, wherein, The hearing device mentioned is a hearing aid.

13. The system according to any one of the preceding claims, wherein, The transmitter coil is also configured to send data to the hearing device.

14. The system according to any one of the preceding claims, wherein, The hearing device includes a receiver, and The receiver coil is positioned close to the receiver.

15. The system according to any one of the preceding claims, wherein, The charging device includes a cover and a body, and The cavity for housing the hearing device is formed by both the cover and the body, and the transmitter coil is arranged in the cover or the body of the charging device.

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