Wireless charging device with signal parameter adjustment

Abstract

The invention describes a wireless charging device (100) comprising: i) a transmitter device (110) to wirelessly charge a chargeable device (200) using at least one signal parameter; ii) detection means (120) to detect the presence of another RF device (150) and to detect at least another signal parameter with respect to the another RF device (150); and iii) adjustment means for adjusting the at least one signal parameter of the charging device (100) with respect to the detected further signal parameter of the further RF device (110).

Description

Technical Field

[0001] This disclosure relates to a wireless charging device, comprising: a transmitter device for wirelessly charging a rechargeable device using at least one signal parameter; a detection device for detecting the presence of another (active) RF device and detecting at least another signal parameter relative to the other RF device; and an adjustment device for adjusting the at least one signal parameter of the charging device relative to the detected other signal parameter of the other RF device. This disclosure further relates to a wireless charging system and a method for wirelessly charging a rechargeable device.

[0002] This disclosure can therefore relate to the field of radio frequency devices, particularly to the field of wireless charging, for example, to the field of RFID, NFC or Qi charging applications. Background Technology

[0003] Radio devices are widely used to enable communication between electronic devices. A radio device typically includes a transmitter and / or receiver, matching circuitry, and an antenna. While the transmitter / receiver is usually formed on a chip (integrated circuit), the matching circuitry and antenna can be implemented outside the chip, for example, as an antenna device.

[0004] Specific examples of wireless devices can be RFIC devices and / or NFC devices. These devices are used in a variety of applications involving, for example, smart cards or smartphones, to establish radio communication with each other by touching them together or bringing them extremely close, such as within a short distance of, for example, a few meters or only a few millimeters (for wireless charging). Applications particularly include simplified setups for contactless transactions, data exchange, and more complex communications such as Wi-Fi or Bluetooth. Various other types of communication applications include communication between, for example, an RFID device on an NFC-enabled mobile phone and another RFID device, for example, an NFC chip called a “tag.” Some applications involving identification products such as smart cards and RFID tags are used in industries such as transportation (e.g., ticketing, road toll collection, baggage tagging), finance (e.g., debit and credit cards, e-wallets, merchant cards), communications (e.g., SIM cards for GSM phones), and tracking (e.g., access control, inventory management, asset tracking).

[0005] In a wireless charging (WLC) scenario, a charging device (poller device) is used to charge a rechargeable device (listener device) using radio frequency signals. A common scenario is that another wireless charging device (another poller device) is present and operating in the vicinity of the charging device, charging another rechargeable device (another listener device).

[0006] However, it can be shown that the presence of another charging arrangement (an additional charging device and an additional rechargeable device) can cause interference to the charging arrangement (the charging device and the rechargeable device). Specifically, interference between charging devices may cause beat frequencies due to carrier frequency mismatch. This beat frequency may, for example, cause communication errors on the charging device side or overvoltage events on the rechargeable device side. Furthermore, it can be shown that even in the case of a frequency-coherent system, a certain carrier phase relationship between charging devices may lead to a reduced voltage on the rechargeable device side and thus a lower overall system efficiency.

[0007] Figures 9A to 9D This illustrates the effect of frequency / phase mismatch on the charging device and the corresponding rechargeable device in a typical wireless charging scenario. The x-axis represents time in seconds, while the y-axis represents amplitude in volts.

[0008] Figure 9A Frequency mismatch affects the receiver input (differential receiver voltage) of the charging device, resulting in beat frequencies that may cause communication failures.

[0009] Figure 9B The impact of frequency mismatch on antenna output (antenna voltage): Reduced power transmission efficiency.

[0010] Figure 9C Rechargeable device rectifier input voltage in the presence of interference (from another RF device): Voltage swings at the rectifier input will cause overvoltage events on the rechargeable device side that affect system-level performance.

[0011] Figure 9D Ripple in the load voltage of the rechargeable device can be observed due to interference from another RF device, which may result in a longer charging time. Summary of the Invention

[0012] It may be necessary to provide efficient and robust wireless charging.

[0013] A wireless charging device, a wireless charging system, and a method are provided.

[0014] According to one aspect of this disclosure, a wireless charging device (e.g., poller, charging station, etc.) is described, the wireless charging device comprising:

[0015] i) A transmitter device (e.g., including an antenna and a transmitter block) for wirelessly charging a rechargeable device (e.g., a radio, a mobile phone, etc.) using at least one signal parameter (e.g., frequency, phase, amplitude, etc.).

[0016] ii) A detection device (e.g., a frequency measuring device, a phase estimating device, etc.; specifically, at least partially coupled to the receiver) (configured), said detection device for...

[0017] iia) detects the presence (within the vicinity, e.g., within 0.3mm to 3mm) of another (active) RF device (e.g., another charging device; specifically operating in a comparable / similar frequency band) (e.g., similar or different wireless charging devices) (in operation), and

[0018] iib) detects at least one other signal parameter (e.g., frequency, phase, amplitude, etc.) relative to the other RF device (in operation), and

[0019] iii) An adjustment device (e.g., a frequency and / or phase adjustment device) for adjusting at least one signal parameter of the charging device relative to another signal parameter of the other detected RF device (thereby establishing coexistence of the operating charging devices).

[0020] According to another aspect of this disclosure, a wireless charging system (arrangement) is described, the wireless charging system comprising: a charging device as described above and at least one of the following: a rechargeable device, the other RF device, and another rechargeable device.

[0021] According to another aspect of this disclosure, a method is described for (operating a wireless charging device using at least one signal parameter for wireless charging of a rechargeable device), the method comprising:

[0022] i) Detect the presence of another RF device.

[0023] ii) Detect at least another signal parameter of the other RF device, and

[0024] iii) Adjust at least one signal parameter of the charging device relative to the detected signal parameters of the other RF device.

[0025] In this context, the term "presence of another RF device" specifically refers to a situation where another RF device is located near the charging device. The term "near" here can indicate the distance at which the operation of the other RF device might affect (interfere with) the operation of the charging device. In the case of an NFC device, this distance could be a few millimeters, for example, 3 mm or less. However, the presence of another RF device may not only be a matter of distance, but also a matter of the amount of energy coupled from the interfering device.

[0026] In this context, the term "another RF device" specifically refers to another radio (frequency) device, such as another charging device, specifically one that is operational / active. In one example, the other RF device operates at least partially in the same frequency band as the charging device, which may cause interference.

[0027] In this context, the term "detection device" specifically refers to a device suitable for detecting at least one signal parameter, such as frequency, amplitude, or phase. For example, a detection device may be implemented as a frequency counter or an amplitude and / or frequency meter. The detection device may be coupled to a receiver device, for example, at least partially integrated into the receiver device. The detection device may also be coupled to a transmitter device, for example, when performing a phase sweep to determine the maximum (amplitude iso) phase value. The detection device may also be configured to detect the presence of another RF device, for example, by measuring the signal characteristics caused by interference (e.g., beat frequency).

[0028] In this context, the term "adjustment device" specifically refers to a device suitable for adjusting signal parameters such as frequency, amplitude, or phase. For example, an adjustment device may be configured to adapt the carrier frequency of a charging device to the carrier frequency of another RF device. In one embodiment, the adjustment device may be configured as an oscillator with a variable frequency.

[0029] According to an exemplary embodiment, the present invention can be based on the idea that efficient and robust wireless charging can be achieved when a charging device detects the presence of another nearby RF device and at least one signal parameter, and adjusts its own signal parameters according to the detected signal parameters of the other RF device. In this simple and direct manner, stable simultaneous charging of multiple nearby charging devices (coexisting) can be achieved.

[0030] This disclosure enables robust coexistence between the charging device and another RF device (multiple wireless charging systems). Furthermore, this disclosure can achieve high power transfer efficiency even in the presence of another RF device, for example, using positive interference. Compared to conventional solutions such as time-domain multiplexing charging, potentially faster charging cycles can be achieved.

[0031] In an exemplary embodiment, the charging device initiating a WLC session senses the presence of a nearby, already active WLC session (with another RF device) and readjusts its operating frequency to a frequency coherent with the active WLC session. With a coherent frequency, there is no beat frequency. Additionally, the phase of the charging device's transmitter signal can be adjusted to achieve constructive superposition (positive interference) with an external field generated by the other RF device at the antenna. The frequency and / or phase of the charging device can be dynamically adjusted in real time, taking into account practical operating conditions such as detuning, coupling, power delivery status, and matching component values.

[0032] In exemplary embodiments, this disclosure describes a method for measuring the signal characteristics of an interference source in an RF-based (e.g., NFC) wireless charging scenario, and a control mechanism for mitigating performance regression by adjusting charging device parameters.

[0033] The aspects defined above and others of this disclosure will become apparent from the examples of embodiments described below, and will be illustrated with reference to these examples of embodiments. This disclosure will be described in more detail below with reference to examples of embodiments, but this disclosure is not limited to these examples of embodiments.

[0034] Exemplary embodiments

[0035] According to an embodiment, the signal parameters include the operating frequency, specifically the carrier frequency. For example, the carrier frequency of the other RF device can be measured, and then the carrier frequency of the charging device can be adapted to the measured carrier frequency of the other RF device. This allows for a significant and straightforward improvement in wireless charging efficiency.

[0036] According to an embodiment, the detection device includes a frequency measuring device, specifically a frequency counter. To measure the frequency of the external field of the other RF device, the charging device may be equipped with a frequency measuring device such as a frequency meter. This device can be implemented in an efficient manner, for example, within existing hardware such as a receiver.

[0037] According to an embodiment, the signal parameters include the operating (signal) phase. For example, the signal phase of the other RF device can be measured, and then the signal phase of the charging device can be adapted to the measured signal phase of the other RF device. This, in turn, allows for a significant and straightforward improvement in wireless charging efficiency.

[0038] According to an embodiment, the detection device includes a phase estimation device. To measure the phase of the external field of the other RF device, the charging device may be equipped with a phase estimation device. This device can be implemented, for example (at least partially) in the existing hardware of the receiver in a cost-effective manner.

[0039] According to an embodiment, the phase estimation device includes a peak voltage detector to detect a peak voltage (specifically at / in the receiver) of the other RF device. For example, this peak voltage detector may be implemented in the receiver of a charging device. Based on the measured peak voltage, the phase being used by the other RF device can be determined.

[0040] According to an embodiment, the phase estimation device is configured to perform phase sweeping and thereby detect / calculate the maximum / optimal phase value (e.g., amplitude, voltage, etc.), specifically using a peak voltage detector. By sweeping the signal of the charging device (transmitter) across multiple phases, if a maximum phase value is obtained, the signal can be detected (e.g., at the peak voltage detector). In this case, there should be a phase identical to that of the other RF device, allowing the phase of the other RF device to be determined.

[0041] According to an embodiment, the frequency measuring device and the phase estimating device are (at least partially) combined in a common device, specifically an amplitude and / or frequency measuring device (of the receiver). Implementing two measuring devices in a combined device can save cost, labor, and space.

[0042] According to an embodiment, adjusting the signal parameters (specifically, the phase) of the charging device results in positive / phase-continuous interference, specifically used to detect phase coherence. The phase / frequency / amplitude of the charging device can be adjusted to achieve superposition with the phase / frequency / amplitude of the other RF device. In the case of positive interference, the signal of the charging device can be increased.

[0043] According to an embodiment, adjusting the signal parameters of the charging device includes setting the transmitter frequency of the transmitter device to the external field frequency (of the other RF device). According to an embodiment, adjusting the signal parameters of the charging device includes setting the transmitter phase of the transmitter device relative to the external field phase at the receiver tap point. According to an embodiment, adjusting the signal parameters of the charging device includes setting the transmitter amplitude of the transmitter device.

[0044] In one embodiment, amplitude adjustment may not be particularly critical. As described in the algorithm section below, the transmitter can generate a signal whose amplitude depends on a previously measured amplitude of a coupling signal from a nearby operating WLC device. This generated signal can then be swept across the phase, and the tap point voltage can be calculated based on the measured peak voltage in the receiver. The TX phase that causes constructive interference (maximum voltage) at the tap point can then be considered as the optimal phase for maximum efficiency.

[0045] According to embodiments, the detection of the presence of the other RF device includes at least one of the following: event-based detection, interval-based detection, beat frequency detection, and interference detection. There may be multiple options for detecting the presence of the (operating) other RF device, specifically detecting whether there is a negative impact from the other RF device. For example, detecting undesirable effects such as beat frequency or negative interference can indicate that another RF device is operating nearby and should be compensated for.

[0046] According to one embodiment, the charging device further includes a receiver device, wherein the detection device is at least partially integrated in the receiver. In this way, the detection device can be implemented in an existing structure in a cost-effective and space-saving manner.

[0047] According to embodiments, at least one device in the wireless charging system is at least one of an NFC device, a UWB device, a mobile phone, a stylus, and earphones. In principle, any wireless charging / rechargeable electronic device can be applicable. Therefore, this disclosure can be implemented directly in existing and standardized technologies.

[0048] According to embodiments, the following aspects of this disclosure may be of particular concern:

[0049] Frequency counter: Used to measure the frequency of external fields.

[0050] Peak voltage detector: Used to measure the peak voltage at the receiver input.

[0051] Calculate the equivalent tap point voltage against the set transmitter signal phase to determine the phase of the other RF device.

[0052] According to an embodiment, a frequency table is described in conjunction with a peak voltage detector to dynamically adjust the frequency and phase of the charging device transmitter after the presence of an interference source (another RF device) is detected. The control mechanism used to adjust the frequency / phase has low computational cost because the transmitter phase can be determined using a linear relationship between the receiver voltage and the external contact voltage and a peak search method.

[0053] In the context of this document, the term "RFID" (Radio Frequency Identification) can refer to a technology that uses electromagnetic fields (RF fields) for short-range communication (particularly 10 meters or less). The term "RFID device" can refer to any device with RFID functionality. An RFID device may include an antenna and an integrated circuit with a transmitter and a receiver. A typical RFID system may include an RFID reader and one or more RFID tags associated with one or more objects. In the example, the first RFID device includes a transmitter for transmitting RF signals to the second RFID device and a receiver for receiving modulated information from the second RFID device. Standard communication between RFID devices is specified in the protocol.

[0054] In the context of this document, the term "NFC" can refer to near-field communication, which can be a short-range wireless technology (short range being a distance measured in centimeters). For two NFC devices to communicate, a user can bring the NFC devices close together or even touch them. NFC can be considered an established standard. In this document, the NFC standard can be considered a special form of RFID. In the context of this document, the term "NFC device" can refer to any device having NFC functionality as described above. NFC functionality can be implemented, for example, in tags, smart cards, card readers, or mobile phones. Attached Figure Description

[0055] Figure 1 A wireless charging system according to an exemplary embodiment of the present disclosure is shown.

[0056] Figure 2 A flowchart illustrating a method of operating a wireless charging device according to an exemplary embodiment of the present disclosure is shown.

[0057] Figure 3A and Figure 3B The illustration shows charging device receiver input voltages with and without adjustment according to exemplary embodiments of the present disclosure.

[0058] Figure 4A and Figure 4B The illustration shows a charging device transmitter voltage with and without adjustment according to exemplary embodiments of the present disclosure.

[0059] Figure 5A and Figure 5B The diagram illustrates rechargeable device rectifier input voltages with and without adjustment according to exemplary embodiments of the present disclosure.

[0060] Figure 6A and Figure 6B The illustration shows rechargeable device load voltages with and without adjustment according to exemplary embodiments of the present disclosure.

[0061] Figure 7An embodiment of a wireless charging device according to exemplary embodiments of the present disclosure is illustrated in detail.

[0062] Figure 8 Further examples of exemplary embodiments according to this disclosure are shown. Figure 7 For details.

[0063] Figures 9A to 9D This illustrates common problems with wireless charging, such as interference and beat frequency. Detailed Implementation

[0064] Figure 1 A wireless charging system 300 according to an exemplary embodiment of the present disclosure is shown. System 300 includes a wireless charging device 100 (poller A) having an antenna 101 and a transmitter circuitry system. The charging device 100 is shown in operation, i.e., charging a rechargeable device 200 (listener A) via a rechargeable device antenna 201, schematically illustrated by a radio frequency field. Furthermore, system 300 includes another RF device 150 (poller B), here another charging device, similar in this example to charging device 100. The other RF device 150 is also in operation, i.e., charging another rechargeable device 250, schematically illustrated by another radio frequency field. The charging devices 100 and 150 are close to each other, causing the RF fields and the other RF field to interfere with each other. In this way, undesirable effects such as beat frequency and overvoltage / undervoltage can occur (comparison). Figure 3A , Figure 4A , Figure 5A , Figure 6A and Figures 9A to 9D ).

[0065] The charging device 100 also includes a detection device 120 for detecting the presence of another nearby RF device 150 and detecting at least one other signal parameter relative to the other RF device 150. The charging device 100 also includes an adjustment device for adjusting the at least one signal parameter of the charging device 100 relative to the detected other signal parameter of the other RF device 150.

[0066] The case where poller A is charging receiver A and poller B is charging receiver B can be described in a simplified manner at the antenna as follows:

[0067] Poller A = A1*sin(ω1t+Φ1)

[0068] Poller B = A²*sin(ω²t + Φ²)

[0069] It can be shown that due to the signal frequency difference between the two pollers A and B:

[0070] i) Beat frequency may cause communication failures.

[0071] ii) Beat frequency may cause overvoltage events on the receiver.

[0072] iii) The phase difference between the two pollers.

[0073] Here, destructive / negative interference will lead to reduced charging efficiency.

[0074] Figure 2 A flowchart illustrating a method of operating a wireless charging device 100 (e.g., as described above) according to an exemplary embodiment of the present disclosure is shown. Through frequency / phase adaptation / adjustment / compensation, the transmitter (TX) signal (“victim”) can be shifted to avoid the high influence of the “aggressor” signal from another RF device 150.

[0075] Frequency / phase adjustment can be performed at periodic time intervals, for example, by detecting the presence of beat frequencies (e.g., by measuring the DC voltage value of the receiver I / Q channel or receiver mixer) in an event-based manner or by scanning for the presence of interference.

[0076] The method shown in the flowchart can be described as follows:

[0077] i) The first step will be to disconnect the TX signal of the “victim” poller antenna 101 (of the charging device 100) and configure the frequency and phase table of the detection device 120.

[0078] ii) Measure the frequency (Fext) and amplitude (Vext) of the interference signal (of another RF device 150), and calculate the equivalent RX tap voltage.

[0079] iii) Set the frequency of the TX signal of the “victim” (the transmitter device of the charging device 100) to be the same as the measured external field frequency, and set the amplitude of the TX signal to the ratio of the calculated external field voltage at the tap point, i.e., Ftx = Fext and Vtx = Vtapext / n.

[0080] iv) Enable the transmitter of the charging device in continuous wave mode. Apply a first value for the TX phase shift, measure the peak voltage at the receiver, and calculate the equivalent RX tap (VRXtap) voltage for this TX phase. Store the calculated VRXtap voltage and TX phase in memory so that they can be accessed later. Then, apply the next TX phase shift and repeat the RX voltage measurement. In other words, perform a phase sweep to find the optimal phase value.

[0081] v) After calculating the VRXtap voltage for all TX phase shifts, select the TX phase shift value with the maximum VRXtap voltage.

[0082] vi) Set the exported TX phase shift value and TX frequency in the firmware (FW).

[0083] Figure 3A and Figure 3B The diagram shows the input voltage of the charging device 100 receiver with and without adjustment according to exemplary embodiments of the present disclosure. The x-axis represents time in seconds, while the y-axis represents amplitude in volts.

[0084] Figure 3A Without frequency phase adjustment / compensation, the receiver voltage shows a variation of approximately 0.4V.

[0085] Figure 3B With frequency phase adjustment, the receiver input voltage remains constant over time, resulting in robust communication and high power transmission efficiency.

[0086] Figure 4A and Figure 4B The diagram illustrates transmitter / antenna voltages of the charging device 100 with and without adjustment, according to exemplary embodiments of the present disclosure. The x-axis represents time in seconds, while the y-axis represents amplitude in volts.

[0087] Figure 4A Without frequency phase adjustment / compensation, the antenna voltage shows a variation of approximately 1V.

[0088] Figure 4B With frequency and phase adjustment, the antenna voltage remains constant over time, resulting in robust communication and high power transmission efficiency.

[0089] Figure 5A and Figure 5B The diagram shows the input voltage of the rechargeable device 200 rectifier with and without adjustment according to exemplary embodiments of the present disclosure. The x-axis represents time in seconds, while the y-axis represents amplitude in volts.

[0090] Figure 5A Without frequency phase adjustment / compensation, the rectifier input voltage is quite low.

[0091] Figure 5B With frequency and phase adjustment, the rectifier input voltage is stable and quite high.

[0092] Figure 6A and Figure 6B The diagram illustrates the load voltage of a rechargeable device 200 with and without adjustment according to exemplary embodiments of the present disclosure. The x-axis represents time in seconds, while the y-axis represents amplitude in volts.

[0093] Figure 6A Without frequency phase adjustment / compensation, the load voltage is low (approximately 6.1V). The charging device can increase its output power, which may subsequently lead to overvoltage events if the voltage of the rechargeable device is not constant over time.

[0094] Figure 6B With frequency phase adjustment, there are no overvoltage events on the rechargeable device side, and the higher load voltage of 7.6V results in a shorter charging time.

[0095] Figure 7 A detailed embodiment of a wireless charging device 100 according to exemplary embodiments of the present disclosure is shown. The wireless charging device 100 is implemented herein as an NFC device and substantially includes a transmitter device 110 and a receiver device 140. The transmitter device 110 includes an antenna 101 and a matching circuit 102 in a transmitter matching network 111. The transmitter device 110 also includes a transmitter block 112, which includes transmitter circuitry. The receiver device 140 includes a receiver block 141 having receiver circuitry, which includes an I channel 142 and a Q channel 143. The channels 142 and 143 are connected to a digital processing unit 160 (digital control, processing, and analysis block).

[0096] Receiver block 141 also includes an amplitude and frequency table 130. In this example, the amplitude and frequency table 130 includes a differential-to-single-ended converter 131 coupled to a frequency counter 121 as a frequency measurement device, and includes a peak voltage detector 122 as part of a phase estimation device. The peak voltage detector 122 is further connected to a (fixed gain) amplifier 132 and an ADC 133. The output of the phase estimation device (receiver peak voltage) 122 and the output of the frequency counter (receiver frequency) 121 are sent to a digital processing unit 160. In one example, the digital processing unit 160 may perform frequency and / or phase estimation calculations.

[0097] In this example, the digital processing unit / block 160 receives the following inputs: ADC I and Q channel data, VBAT (external supply voltage) measured via the ADC (GPADC), the measured receiver peak voltage, and the measured receiver frequency. From these inputs, the following outputs can be provided: attenuator control signal, transmitter phase control, and boost delay control.

[0098] Figure 8 Further examples of exemplary embodiments according to this disclosure are shown. Figure 7 The details include the transmitter matching network block 111, the amplitude and frequency table 130, the digital processing unit 160, and the transmitter output block 115.

[0099] In an exemplary example, the operation can be described as follows:

[0100] i)X(t) represents the Fourier series of a square wave at the output of a transmitter (TX) with a normalized voltage that produces a square wave with a radial frequency ω1 and an initial phase Φ1.

[0101] ii)X TX1 (t) and X TX2 (t) is the TX signal at the tap point of the receiver (RX) after an LC filter with a cutoff frequency (ωt~ω1).

[0102] X TX1 (t)=A1cos(ω1t+Φ1)

[0103] X TX2 (t)=A1cos(Π-(ω1t+Φ1))

[0104] iii)X ANTT1 and X ANTT2 The signal from the antenna at the RX tap point is described as...

[0105] X ANTT1 (t)=A2cos(ω2t+Φ2)

[0106] X ANTT2 (t)=A2cos(Π-(ω2t+Φ2))

[0107] iv) The voltage (Vt) at the RX tap point can be expressed as X ANTT1-2 and X TX1-2 The superposition, that is

[0108] Vt RXP (y,t)=A1cos(ω1t-k1y+Φ1)+A2cos(ω2t-K2y+φ2)

[0109] Vt RXN (y,t)=A1cos(Π-(ω1t-k1y+φ1))+A2cos(Π-(ω2t-K2y+φ2))

[0110] Where k1 and k2 are respectively Vt RXP and Vt RXP The wave number is given by k = 2π / λ.

[0111] v) Assuming the receiver resistor and capacitor have the same values ​​across RXP and RXN, i.e., Rrxp = Rrxn = Rrx and Crxp = Crxn = Crx, then the differential RX voltage...

[0112] X RXP(t)-X RXN (t)=RHF ATT / (RHF ATT +2(Rrx-jXCrx))*(Vt RXP -Vt RXN )

[0113] vi) can be shown that, for ω1 = ω2, it is possible to target X. TX1-2 The initial phase Φ0 value achieves phase-length interference at the receiver tap point.

[0114] vii) Subsequently, regarding such Figure 8 The differential matching topology shown can be used to estimate the phase relationship between the RX tap point and the antenna.

[0115] Figure Labels

[0116] 100 charging device

[0117] 101 antenna

[0118] 102 Matching Circuit

[0119] 110 transmitter device

[0120] 111 transmitter matching network

[0121] 112 Transmitter Block / Circuit

[0122] 115 Transmitter Output

[0123] 120 detection device

[0124] 121 Frequency measuring device, frequency counter

[0125] 122 Peak detector, part of the phase estimation device

[0126] 130 Amplitude and Frequency Table

[0127] 131 Differential to Single-Ended Converter

[0128] 132 Amplifier

[0129] 133 Analog / Digital Converter

[0130] 140 Receiver Device

[0131] 141 Receiver Block / Circuit

[0132] 142 Channel I

[0133] 143 Q Channel

[0134] 150 Another RF device

[0135] 160 digital processing units

[0136] 200 rechargeable devices

[0137] 201 Rechargeable device antenna

[0138] 250 Another rechargeable device

[0139] 300 charging system.

Claims

1. A wireless charging device (100), characterized by, The wireless charging device comprises: a transmitter device (110) to wirelessly charge a chargeable device (200) using at least one signal parameter; a detection device (120) to detect the presence of a further RF device (150), and detect at least one further signal parameter with respect to the further RF device (150); and an adjustment device to adjust the at least one signal parameter of the charging device (100) with respect to the further signal parameter of the detected further RF device (150).

2. The charging device (100) according to claim 1, characterized in that the signal parameter comprises an operating frequency.

3. The charging device (100) according to claim 1 or 2, characterized in that the detection device (120) comprises a frequency measurement device (121).

4. The charging device (100) according to any of the preceding claims, characterized in that the signal parameter comprises an operating phase.

5. The charging device (100) according to any of the preceding claims, characterized in that the detection device (120) comprises a phase estimation device.

6. The charging device (100) according to any of the preceding claims, characterized in that the adjustment of the phase of the charging device (100) results in constructive interference to detect phase coherence.

7. The charging device (100) according to any of the preceding claims, characterized in that the adjustment of the signal parameter of the charging device (100) comprises at least one of: setting a transmitter frequency of the transmitter device (110) with respect to an external field frequency; setting a transmitter amplitude of the transmitter device (110) with respect to an external field amplitude; setting a transmitter phase of the transmitter device (110) with respect to an external field phase at a receiver tap point.

8. A wireless charging system (300), characterized by, The wireless charging system comprises: a wireless charging device (100) according to any of the preceding claims; and at least one of: the chargeable device (200); the further RF device (150); a further charging device (150); a further chargeable device (250).

9. A method of operating a wireless charging device (100) for wireless charging of a chargeable device (200) using at least one signal parameter, characterized in that, The method comprises: detecting the presence of a further RF device (150); detecting at least one further signal parameter of the further RF device (150); and adjusting the at least one signal parameter of the charging device (100) with respect to the signal parameter of the detected further RF device (150).

10. A computer program product, characterised in that, The computer program product comprises instructions which, when the program is executed by a computer, cause the computer to carry out the method according to claim 9.

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