Wireless charging

Abstract

According to exemplary embodiments of the present disclosure, a transmitter module for omnidirectional wireless charging is provided, comprising two wireless transmitters, which are excited to transmit with a frequency difference compared to one another, and the frequency difference enables non-coherent synthesis in a receiver module.

Description

[Technical Field]

[0001] This disclosure relates to wireless charging, and more particularly to a receiver module, a transmitter module, and a system for wireless charging. [Background technology]

[0002] Wireless power transfer, or WPT, refers to the transfer of energy from a source such as a transmitter to an electronic device via any medium interface, such as air, liquid, or human tissue, using electromagnetic radiation. WPT has attracted considerable attention due to its potential for charging electronic devices. However, at least some WPT systems have limitations, such as the inability to charge devices at a rotated angle, which significantly restricts the flexibility of charging and makes it inconvenient for many applications. Therefore, there is a need to provide enhancements to the functionality of wireless charging. [Overview of the initiative] [Means for solving the problem]

[0003] According to some embodiments, the subject matter of the independent claims is provided. Some embodiments are defined in the dependent claims.

[0004] According to a first aspect of the present disclosure, a transmitter module for omnidirectional wireless charging is provided, comprising two wireless transmitters, the two wireless transmitters being excited to transmit with a frequency difference compared to one another, the frequency difference enabling non-coherent synthesis in a receiver module.

[0005] An exemplary embodiment of the first aspect may include at least one feature from the following bulleted list, or any combination of the following features. The frequency difference is between 0.1kHz and 6kHz, and is preferably 2kHz when the tuning frequency of the transmitter module is 500kHz. The frequency difference is less than 5% of the transmitter module's tuning frequency, preferably less than 2%. The two transmitters are spiral, helical, or double-helix in shape. The two transmitters are planar, box-shaped, or bowl-shaped. The two transmitters are configured to operate in at least one of the near-field or intermediate-field regions. The two transmitters are configured to be coupled to the receiver module inductively or capacitively. The transmitter module further comprises multiple transmitters, each of which is excited to transmit with a frequency difference compared to the others, and this frequency difference enables non-coherent synthesis in the receiver module.

[0006] According to a second aspect of the present disclosure, a receiver module for omnidirectional wireless charging is provided, the receiver module comprising at least one wireless receiver, each of which is configured to receive power from two transmitters having a frequency difference, the frequency difference enabling non-coherent synthesis in the receiver module.

[0007] An exemplary embodiment of the second aspect may include at least one feature from the following bulleted list, or any combination of the following features. The frequency difference is between 0.1kHz and 6kHz, and is preferably 2kHz when the tuning frequency of the receiver module is 500kHz. The frequency difference is less than 5% of the receiver module's tuning frequency, preferably less than 2%. • At least one receiver is configured to operate in at least one of the near-field or intermediate-field regions. • At least one receiver is configured to couple with the transmitter module inductively or capacitively. The receiver module further comprises a plurality of receivers, each of the plurality of wireless receivers is configured to receive power from a plurality of transmitters having a frequency difference, and the frequency difference enables non-coherent combining in the receiver module.

[0008] According to a third aspect of the present disclosure, there is provided an omnidirectional wireless charging system. The omnidirectional wireless charging system comprises: a transmitter module comprising two wireless transmitters, wherein the two wireless transmitters are excited to transmit with a frequency difference compared to each other, and the frequency difference enables non-coherent combining; and a receiver module comprising at least one wireless receiver, wherein each of the at least one wireless receiver is configured to receive power from the two transmitters having the frequency difference, and the frequency difference enables non-coherent combining in the receiver module. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] [Figure 1] FIG. 1 is a diagram showing an induced voltage amplitude fluctuation curve over time according to at least some embodiments of the present disclosure. [Figure 2] FIG. 2 is a diagram showing mutual inductance between a repeater and a receiver versus Rx rotation angle according to at least some embodiments of the present disclosure. [Figure 3] FIG. 3 is a diagram showing a WPT coil for omnidirectional power transmission according to at least some embodiments of the present disclosure. [Figure 4] FIG. 4 is a diagram showing a circuit according to at least some embodiments of the present disclosure. [Figure 5] FIG. 5 is a diagram showing a first application example according to at least some embodiments of the present disclosure. [Figure 6] FIG. 6 is a diagram showing a second application example according to at least some embodiments of the present disclosure. [Figure 7] FIG. 7 is a system block diagram according to at least some embodiments of the present disclosure. [Figure 8]FIG. 1 illustrates a receiver module in accordance with at least some embodiments of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0010] Embodiments of the present disclosure relate to wireless charging, and more particularly, to receiver modules, transmitter modules, and systems for wireless charging. For example, embodiments of the present disclosure can be utilized to achieve true omnidirectional wireless power transfer, i.e., WPT, without using any active control. In some embodiments, non-coherent feeding can be used for two or more transmit antennas to ensure that there are no blind spots for power reception inside and outside the transmitting device.

[0011] Omnidirectional WPT can be used to enable wireless charging independent of the position and rotation of the receiving device relative to the position of the transmitting module, and embodiments of the present disclosure provide a non-coherent power combining technique for omnidirectional WPT systems. By using slightly different operating frequencies across multiple power channels, the phase and amplitude of the induced source on the receiver (Rx) side constantly change with time, resulting in non-zero time-average transmitted power at any random Rx rotation angle. Accordingly, embodiments of the present disclosure provide non-coherent combining for multi-channel WPT systems to achieve full omnidirectional power transfer without using any form of dynamic control. The slightly different operating frequencies are also referred to as closely-spaced operating frequencies or adjacent-spaced operating frequencies.

[0012] A transmitter module for omnidirectional wireless charging may comprise two or more transmitters, such as transmitting coils, each transmitter having a very small but non-zero difference between frequencies (i.e., f2=f1+Δf2, f3=f1+Δf3, ..., where

[0013] (Math.

[0014] Δf2≠Δf3≠Δf … ) has slightly different frequency f 1,2,3,… It can be excited by . That is, the transmitter module may comprise two or more wireless transmitters, the two or more wireless transmitters having a frequency difference Δf compared to a first frequency f1. 2,3,… The system is excited to transmit using a frequency difference, which enables non-coherent synthesis in the receiver module.

[0015] In some embodiments, the frequency of the first transmitter in the transmitter module may be 499 kHz. The frequency of the second transmitter in the transmitter module may be 501 kHz. The tuning frequencies of the transmitter module are based on the operating frequencies of each channel, and the tuning frequencies of the receiver module are based on the frequencies of the transmitter module, in which case they may all be 500 kHz.

[0016] The tuning frequencies of the transmitter and receiver modules may be within any frequency range from kHz to GHz. For example, the frequency range may vary from 87 kHz to 205 kHz (Qi standard), 6765 to 6795 kHz (AirFuel), etc. As an example of different tuning frequencies, with an operating frequency of 6.78 MHz, the frequency difference may vary within 140 kHz. For example, when the tuning frequencies of the transmitter and receiver modules are 6.78 MHz, the frequency difference may preferably be between 40 kHz and 80 kHz.

[0017] In some embodiments, the tuning frequency may be, for example, 500 kHz. Frequency difference Δf i The frequency difference is between 0.1 kHz and 6 kHz, preferably 2 kHz. A frequency difference of 2 kHz maintains a relatively low C while keeping the root mean square voltage (power supply) high compared to larger frequency difference values. LThis value can be particularly beneficial in providing low voltage ripple. Therefore, for optimal performance when the center tuning frequency is 500 kHz, a frequency difference of 2 kHz can be selected as the frequency difference between the two power channels, i.e., between the two transmitters.

[0018] In some embodiments, the frequency difference Δf i This may be the harmonic frequency of the transmitter module's tuning frequency, i.e., less than the tuning frequency. Alternatively, or additionally, the frequency difference Δf i This may be less than 5%, preferably less than 2%, of the tuning frequency of the first transmitter. The tuning frequency may also be called the operating frequency or working frequency.

[0019] In some embodiments, the frequency difference variation range of the power transfer channel may be less than 5%, preferably less than 2%, of the switching frequency of the first channel (for good efficiency). That is, the frequency difference may be less than 5%, preferably 2%, of the tuning frequencies of the transmitter module and the receiver module.

[0020] In some embodiments, the two transmitters may be spiral, helical, or double-helix in shape. Alternatively, or additionally, the two transmitters may be planar, box-shaped, or bowl-shaped. The two transmitters may be configured to operate at at least one of short and medium distances. In terms of electromagnetic distance, short distance may be defined as kd ≤ 0.2π and medium distance as 0.2π ≤ kd ≤ 2π, where k is the wavenumber in free space and d is the distance between the transmitter and receiver.

[0021] In some embodiments, the transmitter module may comprise multiple transmitters, each of which is excited to transmit with a frequency difference compared to the others, and this frequency difference enables non-coherent synthesis in the receiver module. The multiple transmitters, such as transmitter coils, may have different shapes (e.g., spiral, helical, double helix, etc.) and may be arranged in different forms (e.g., planar, ball-shaped, box-shaped, bowl-shaped, etc.).

[0022] A receiver module for omnidirectional wireless charging may comprise at least one wireless receiver, each of which is configured to receive power from two transmitters having a frequency difference, the frequency difference enabling non-coherent synthesis in the receiver module. In some embodiments, the receiver module may comprise multiple receivers, each of which is configured to receive power from multiple transmitters having a frequency difference, the frequency difference enabling non-coherent synthesis in the receiver module. In the case of multiple transmitters, the frequency difference may refer to the difference between adjacent transmitters.

[0023] For example, the receiver module has a resonant frequency f0 ≈ f to inductively couple with the transmitter at short and medium ranges. 1,2,… The system may comprise multiple receivers tuned to receive power from all frequencies corresponding to all coupled transmitters, thereby resulting in non-coherent power summing in all receivers, i.e., the receiver module. The shape, arrangement, or orientation of the receivers, such as receiver coils, may be in any form, as long as there is sufficient magnetic coupling between the receivers and one or more transmitters. According to embodiments of the present disclosure, there are no positions or orientations that result in total magnetic field cancellation, and as a result, there are no blind spots whatsoever in the charging area of ​​the transmitter module.

[0024] The omnidirectional wireless charging system may further comprise a transmitter module comprising two or more wireless transmitters, which are excited to transmit with a frequency difference compared to one another, and the frequency difference enables non-coherent synthesis in the receiver module. The omnidirectional wireless charging system may also further comprise a receiver module comprising at least one wireless receiver, each of which is configured to receive power from all transmitters with a frequency difference, and the frequency difference enables non-coherent synthesis in the receiver module.

[0025] The omnidirectional wireless charging system may be a wireless power transfer system that combines non-coherent power transmission using a transmitter module and non-coherent synthesis using a receiver module, achieving true omnidirectional power transfer to multiple receivers of different sizes and shapes without any blind spots.

[0026] In some embodiments, the combination of non-coherent power transmission using a transmitter module and non-coherent synthesis using a receiver module can be implemented by capacitively coupled power transmitters and receivers made of metal plates and capacitively coupled in the near field. Thus, the two or more transmitters may be configured to be inductively or capacitively coupled to a receiver module, and the two or more receivers may be configured to be inductively or capacitively coupled to a transmitter module.

[0027] Non-coherent power combining for omnidirectional WPT systems can be performed using slightly different operating frequencies across multiple power channels, thereby ensuring that the Rx-side induction source always has a time-varying amplitude regardless of the Rx position, resulting in a non-zero time-averaged transferred power at any random Rx rotation angle. Non-coherent power combining according to embodiments of this disclosure provides a solution for multi-channel WPT systems to achieve complete omnidirectional power transfer without any form of dynamic control.

[0028] FIG. 1 shows induced voltage amplitude fluctuation curves with respect to time, in accordance with at least some embodiments of the present disclosure. FIG. 2 shows mutual inductance between a repeater and a receiver with respect to an Rx rotation angle, in accordance with at least some embodiments of the present disclosure. It should be noted that embodiments of the present disclosure are not limited to the case of repeater-receiver coupling, and also function when a transmitter and a receiver are directly coupled.

[0029] More specifically, FIG. 1 shows induced voltage amplitude A with respect to time t and four Rx rotation angles θ=0°, 15°, 45°, 135° in (θ,t). The peak value of each channel is assumed to be A 1(max) =A 2(max) =20V.

[0030] FIG. 1 shows changes in induced voltage amplitude A with respect to time t and Rx rotation angle θ in Due to the symmetry of the two-coil structure, the mutual inductance between the transmitter Tx and the repeater Rp has the same value in each power channel. Considering orthogonally arranged coil pairs, the mutual inductance between Rp and Rx follows |M Rx1 (θ)|=|M Rx2 (θ+90°)| at a constant transmission distance (see FIG. 2), and the sign of the Rp-Rx coupling changes with the Rx rotation angle. In FIG. 1, four θ values are shown as examples to illustrate the dependence of amplitude on t and θ.

[0031] When a frequency difference fΔ≠0 (i.e., ω1≠ω2) exists between two channels, it can be seen that the induced voltage amplitude A on the Rx side in (θ,t) is always a function of t that is not equal to zero unless A1=A2=0. As long as Rx is coupled to at least one of Rp, the amplitudes of both A1 and A2 will not be zero. This means that, as shown by the exemplary values of four θ in FIG. 1, the amplitude of the induced voltage at the Rx terminal always has a non-zero time-varying amplitude at any Rx position around the transmission structure. As shown in FIG. 1, M Rx1 (θ)=M Rx2The power transfer at position (θ) is the same in non-coherent power summation because there is only a phase shift between these two cases, but the average induced voltage has the same value. In the absence of non-coherent power summation, M Rx1 (θ) = M Rx2 The Rx position of (θ) corresponds to the maximum induced voltage, but without active control, M Rx1 (θ) = -M Rx2 When (θ) is given, the voltage drops to 0.

[0032] Therefore, embodiments of the present disclosure enable the Rx voltage, current, and power in the receiver load to never be completely zero in any combination, regardless of the sign of the mutual inductance.

[0033] Figure 3 shows a WPT coil for omnidirectional power transfer according to at least some embodiments of the present disclosure. More specifically, Figure 3 shows an omnidirectional wireless charging system (1) comprising a transmitter module (10) and a receiver module (20). The transmitter module (10) comprises a first transmitter (12) and a second transmitter (14). The first transmitter (12) and the second transmitter (14) are sometimes referred to as transmitter coils, such as WPT coils. The receiver module (20) comprises at least one receiver (22). In some embodiments, the receiver module (20) may further comprise at least one other receiver (not shown in Figure 3).

[0034] The two wireless transmitters (12, 14) are excited to transmit with a frequency difference when compared to each other, and this frequency difference enables non-coherent synthesis in the receiver module (20). The two wireless receivers (22) are configured to receive power from the two transmitters (12, 14) with a frequency difference.

[0035] Non-coherent summing can be defined as follows: In any multiple transmitter WPT system, the power summing at the receiver from two or more input channels, and when the inputs are coherent in frequency (same frequency), can be exactly zero at some point. However, when the inputs are non-coherent and there is a frequency difference (under non-coherent frequency variation conditions, e.g., less than 5%, preferably 2%), the sum of the input powers is always non-zero, thereby eliminating the blind zone in a coherent WPT system and enabling charging at the full rotation angle.

[0036] In some embodiments, the WPT link may comprise two transmitter-repeater (Tx-Rp) pairs coupled with a receiver module (20), as shown in Figure 3, and may form two wireless power channels.

[0037] Figure 4 shows a circuit according to at least some embodiments of the present disclosure. An equivalent circuit (30) of a 2-channel WPT system is shown in Figure 4, where the two power channels are inverter 1-Tx1-Rp1 (32) and inverter 2-Tx2-Rp2 (34). Both of them have a mutual inductance M Rx1 and M Rx2 This allows power to be transmitted to the Rx coil.

[0038] When a multi-channel WPT system is coherently synchronized in phase and frequency, the transmitter (12, 14) and receiver (22) can be carefully designed to have equal resonant frequencies. However, coherent WPT systems require sophisticated control circuits to perform omnidirectional charging. Referring to 135° and 315° in Figure 2, Rx is M at the blind angle for charging. Rx1 (θ) = -M Rx2 When arranged at (θ), the AC supply of the two power channels (i.e., v ac,01 and v ac,02) must be actively adjusted to be in opposite phase. By applying active control, the power supplied to the Rx side may be added instead of completely canceling out at the 135° and 315° transmission positions. Similarly, M Rx1 (θ) = M Rx2 At the transmission position (θ) (i.e., 45° and 225° in Figure 2), the supply voltage needs to be returned to an in-phase relationship in order to achieve non-zero power transmission.

[0039] In contrast, by using different frequencies for each power channel, non-coherent power combining always provides time-varying transfer energy regardless of the position of Rx, and therefore the time-averaged power supplied to the Rx side is never zero. Thus, non-coherent power combining provides a solution for multi-channel WPT systems to achieve complete omnidirectional power transfer without any form of dynamic control.

[0040] Figure 5 shows a first application example according to at least some embodiments of the present disclosure. In the first application example shown in Figure 5, the third transmitter is indicated by 16, and the receiver (22) is located outside the transmitter module (10).

[0041] Figure 6 shows a second application example according to at least some embodiments of the present disclosure. In the second application example shown in Figure 6, the receiver (22) is located inside the transmitter module, i.e., between the first transmitter (12), the second transmitter (14), and the third transmitter (16).

[0042] Figures 5 and 6 illustrate two possible applications of 3D omnidirectional WPT, where the Rx device is positioned either outside or inside the transmitting unit, as shown in Figures 5 and 6, respectively. These scenarios demonstrate wireless charging solutions achievable through a non-coherent regime.

[0043] Figure 7 shows a system block diagram according to at least some embodiments of the present disclosure. The non-coherent power combining method may be applied to any multi-channel WPT system, where each Tx coil Txn may be connected to an impedance tuning network. The AC power is combined at a specific operating frequency f Chn =f n=1,2,3,… It can be supplied from an inverter operating at AC power. The Rx coil can receive power transfer from all coupled Tx coils via its tuning network and rectifier. AC power can be converted to DC and supplied to the load.

[0044] Figure 8 shows a receiver module according to at least some embodiments of the present disclosure. A receiver module (20) of a WPT system may comprise at least one receiver (22), each of which may provide one or more DC outputs to a single DC load. Each DC output is converted from AC by a rectifier, and the AC side of the rectifier may comprise one or more receiver coils. The DC side connection and / or AC side coil connection may be either in series or in parallel.

[0045] As shown in Figure 8(a), the receiver (22) may comprise a single receiver coil, its tuning circuit, and a rectifier. As shown in Figure 8(b), the receiver (22) may comprise multiple receiver coils, one tuning circuit, and one rectifier. These coils may be connected on the AC side before the rectifier. The connection may be in series or parallel. The power received by each coil from the transmitters (12, 14) may be combined non-coherently on the AC side. As shown in Figure 8(c), the receiver (22) may comprise multiple receiver coils, each of which has its own tuning circuit and rectifier. The power received by the receiver coils may be combined on the DC side by connecting the rectifier outputs in series or parallel.

[0046] Therefore, embodiments of this disclosure offer a variety of advantages, including the following: • The power supply has multiple frequencies, which provide non-coherent power synthesis in each Rx device. • No control unit or receiver position sensor is required. • Uses closely spaced frequencies ("narrow-spacing frequencies," "close-spacing frequencies") to generate non-coherent power synthesis for wireless charging. Each receiver receives power from all frequencies, resulting in non-coherent power summing across all receivers. • Non-coherent regimes are independent of coil design or compensation circuit topology. • Inductive (or capacitive) coupling of the near-field and intermediate fields is possible, which is fundamentally different from far-field radiation. Instead of focusing on supporting multiple standards simultaneously with a single design, it can be designed to support different wireless charging standards such as Qi, Qi2, and A4WP.

[0047] In the case of a selective omnidirectional magnetic resonance coupled MRC WPT with a multi-receiver system, the radio frequency power for the resonant cell can be changed only in amplitude and / or phase, without any change in frequency. Such a solution is quite different from the non-coherent regime of this disclosure, in which slightly different frequencies are used for the power supply.

[0048] If two different operating frequencies (e.g., 13.56 MHz and 27.12 MHz) are used for two separate receivers, the system will be quite different from the non-coherent regime of this disclosure in which slightly different frequencies are transmitted to a single Rx device.

[0049] When self-tuning omnidirectional wireless power transfer using a double toroidal helical coil at a single frequency is used, the system does not leverage non-coherent signaling. Because magnetic fluxes cancel each other out at angles at specific receiver positions, creating blind spots, the output power and efficiency of such a system vary with the receiver's position. In contrast, embodiments of the present disclosure employ non-coherent synthesis to ensure constant high efficiency and output power without any blind spots.

[0050] When power transmission uses far-field radiation for wireless communication, it will be different from the near-field coupling mechanism for wireless charging. Non-overlapping frequency methods, including frequencies corresponding to individual radio frequency bands used for wireless communication such as UHF, GSM, and Wi-Fi, will be entirely different from the slightly different frequencies used in the non-coherent regimes of this disclosure.

[0051] When a WPT system is implemented in the radio frequency band, it may require identification, communication, matching filters, phase adjustment, and control. In contrast, embodiments of this disclosure, which conform to some current wireless charging standards such as Qi and A4WP standards, operate in the kHz to MHz range and do not require control for basic charging operations.

[0052] When power beaming techniques are used from different sources at GHz frequencies, complex control mechanisms may be required. In addition, phase alignment modules and processing modules may be needed to track the devices.

[0053] It should be understood that the embodiments disclosed herein are not limited to any specific structure, process step, or material disclosed herein, but extend to their equivalents as would be recognized by those skilled in the art. It should also be understood that the terms used herein are for the purpose of describing specific embodiments only and are not intended to be limiting.

[0054] Throughout this specification, any reference to one embodiment means that any particular feature, structure, or characteristic described in relation to that embodiment is included in at least one embodiment of this disclosure. Therefore, where the phrase "in one embodiment" appears in various places throughout this specification, it does not necessarily refer to the same embodiment. For example, where numerical values ​​are referred to using terms such as approximately or substantially, the exact numerical values ​​are also disclosed.

[0055] When used herein, multiple items, structural elements, compositional elements, and / or materials may be presented in common lists for convenience. However, these lists should be interpreted as if each member of the list were individually identified as a distinct and unique member. Therefore, no individual member of such a list should be interpreted as a de facto equivalent of any other member of the same list, based solely on its presentation in a common group, unless otherwise indicated. In addition, various embodiments and examples of this disclosure may be referenced herein along with alternatives for their various components. It should be understood that such embodiments, examples, and alternatives should not be interpreted as de facto equivalents of one another, but should be considered as distinct and autonomous representations of this disclosure.

[0056] Furthermore, the described features, structures, or properties can be combined in any suitable manner in one or more embodiments. The foregoing description provides numerous specific details, such as examples of length, width, and shape, to allow for a full understanding of the embodiments of the disclosure. However, those skilled in the art will recognize that the disclosure can be implemented without using one or more of the specific details, or using other methods, components, materials, etc. In other instances, well-known structures, materials, or operations are not illustrated or described in detail to avoid obscuring the aspects of the disclosure.

[0057] While the examples described above illustrate the principles of the Disclosure in one or more specific uses, it will be apparent to those skilled in the art that numerous modifications can be made in form, use, and details of implementation without exhibiting the capabilities of the invention or departing from the principles and concepts of the Disclosure. Therefore, the Disclosure is not intended to be limited except as provided in the claims below.

[0058] The verbs “comprise” and “include” are used herein as open limitations, not to exclude or require the presence of features not described herein. Features described in dependent claims may be freely combined with each other unless otherwise specified. Furthermore, it should be understood that the use of “a” or “an,” i.e., the singular form, throughout this specification does not exclude the plural form.

[0059] As used herein, “at least one of the following, <list of two or more elements>” and “at least one of the <list of two or more elements>,” as well as similar expressions in which two or more elements of a list are joined by “and” or “or,” mean at least one of the elements, at least two or more of the elements, or at least all of the elements. [Industrial applicability]

[0060] At least some embodiments of this disclosure are industrially applicable to wireless charging.

[0061] List of initial letters AC alternating current DC direct current MRC Magnetic Resonance Coupling Rp Repeater Rx receiver Tx transmitter WPT Wireless Power Transfer [Explanation of symbols]

[0062] 1 Charging System 10 Transmitter Modules 12 First Transmitter 14. Second Transmitter 16. Third Transmitter 20 Receiver Modules 22 Receivers 30 circuits 32. First power channel 34. Second power channel

Claims

1. A transmitter module for omnidirectional wireless charging, - Equipped with two wireless transmitters, the two wireless transmitters are excited to transmit with a frequency difference when compared to each other, and the frequency difference enables non-coherent synthesis in the receiver module. Transmitter module.

2. The transmitter module according to claim 1, wherein the frequency difference is between 0.1 kHz and 6 kHz, and is preferably 2 kHz when the tuning frequency of the transmitter module is 500 kHz.

3. The transmitter module according to claim 1 or claim 2, wherein the frequency difference is less than 5% of the tuning frequency of the transmitter module.

4. The transmitter module according to any one of claims 1 to 3, wherein the two transmitters are spiral, helical, or double-helix.

5. The transmitter module according to any one of claims 1 to 4, wherein the two transmitters are planar, box-shaped, or bowl-shaped.

6. The transmitter module according to any one of claims 1 to 5, wherein the two transmitters are configured to operate in at least one of the near-field region or the intermediate-field region.

7. The transmitter module according to any one of claims 1 to 6, wherein the two transmitters are configured to be coupled inductively or capacitively with the receiver module.

8. - Further comprising a plurality of transmitters, each of the plurality of wireless transmitters being excited to transmit with a frequency difference compared to one another, the frequency difference enabling non-coherent synthesis in the receiver module, A transmitter module according to any one of claims 1 to 7.

9. A receiver module for omnidirectional wireless charging, - comprising at least one receiver, each of the at least one wireless receiver configured to receive power from two transmitters having a frequency difference, the frequency difference enabling non-coherent synthesis in the receiver module. Receiver module.

10. The receiver module according to claim 9, wherein the frequency difference is between 0.1 kHz and 6 kHz, and is preferably 2 kHz when the tuning frequency of the receiver module is 500 kHz.

11. The receiver module according to claim 9 or 10, wherein the frequency difference is less than 5% of the tuning frequency of the receiver module.

12. The receiver module according to any one of claims 9 to 11, wherein the at least one receiver is configured to operate in at least one of the near-field or intermediate-field regions.

13. The receiver module according to any one of claims 9 to 12, wherein the at least one receiver is configured to be coupled inductively or capacitively with the transmitter module.

14. - Further comprising multiple receivers, each of the multiple wireless receivers configured to receive power from multiple transmitters having a frequency difference, the frequency difference enabling non-coherent synthesis in the receiver module. The receiver module according to any one of claims 9 to 13.

15. - A transmitter module comprising two wireless transmitters, wherein the two wireless transmitters are excited to transmit with a frequency difference when compared to each other, and the frequency difference enables non-coherent synthesis, - A receiver module comprising at least one wireless receiver, each of the at least one wireless receiver configured to receive power from the two transmitters having the frequency difference, wherein the frequency difference enables non-coherent synthesis in the receiver module. An omnidirectional wireless charging system equipped with this feature.

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