Probe signal, wireless charging method, and wireless charging device

Abstract

Provided herein is a probe signal for detecting a power receiving device in wireless charging, which is configured to wake up a power receiving device in a wireless charging field and cause the power receiving device to generate a feedback signal based on a modulated wave of about 2 kHz. Wherein the duration of the probe signal is greater than 1 millisecond and less than 65 milliseconds; and the probe signal is configured to identify the carrier. Also provided herein is a wireless charging method for a wireless charging device using the probe signal, and a wireless charging device using the probe signal.

Description

Technical Field

[0001] This article relates to the field of wireless charging, specifically to a detection signal used to detect a power receiving device in wireless charging, a wireless charging method for a wireless charging device using the detection signal, and a wireless charging device using the detection signal. Background Technology

[0002] After more than a decade of development, wireless charging technology has become increasingly mature and its applications are becoming more widespread, especially in the automotive sector, where it is gaining popularity among automakers. However, with more and more car manufacturers using wireless communication tags (such as NFC cards or RFID cards) as car keys, it is often necessary to systematically trigger the NFC detection system to detect NFC cards in order to protect them from damage by in-vehicle wireless charging devices.

[0003] Current wireless charging devices typically use a detection signal (also known as Ping) to detect the presence of power-receiving devices, such as mobile phones, within the wireless charging field. Based on the Qi wireless charging protocol, such as... Figure 1 As shown, analog ping and digital ping are commonly used as detection signals for power receiving devices.

[0004] Simulated Ping typically has a very short duration (less than 50 microseconds), and the voltage is usually set to 5V (the voltage can be adjusted according to the specific application). Simulated Ping uses a short duration to ensure that the power receiving device is not woken up. It identifies the presence of an object in the wireless charging field of the wireless charging device by judging the signal changes of the wireless charging device that emitted the simulated Ping, but it cannot accurately identify whether the object in the wireless charging field is the power receiving device.

[0005] The duration of a digital ping is typically between 65 and 70 milliseconds. Therefore, a longer ping duration provides the energy needed to wake up the power receiver. Once awakened, the power receiver transmits an ASK signal as a feedback signal, containing basic information about the power receiver. The ping duration is long enough for the wireless charging device to acquire this basic information for subsequent wireless charging. Therefore, the digital ping is used not only to determine if an object in the wireless charging field is a power receiver, but also to determine its basic information.

[0006] Currently, the detection of power receiving devices and wireless communication tags in wireless charging are often performed at different times. For example... Figure 2 As shown, during certain periods of operation, the wireless charging device periodically alternates between using digital ping to detect the power receiving device and detecting the wireless communication tag. However, this can lead to blind spots in the detection of the wireless communication tag. For example, if the power receiving device and the wireless communication tag are placed in the wireless charging field simultaneously after completing one wireless communication tag detection, the subsequent digital ping will detect the presence of the power receiving device. Consequently, it will skip the subsequent wireless communication tag detection and directly activate the wireless charging function to provide power to the power receiving device. In this case, the energy provided by the wireless charging device can damage the wireless communication tag. Furthermore, since the duration of a digital ping is between 65ms and 70ms, the energy is relatively high, posing a risk of damaging the wireless communication tag. Moreover, because the wireless charging device continuously alternates between triggering wireless communication tag detection and digital ping during standby, the standby power consumption of the wireless charging device is high, resulting in a slow charging response speed.

[0007] Therefore, existing wireless charging methods and devices need to be improved to prevent blind spots in wireless communication tag detection, avoid damage to wireless communication tags, reduce standby power consumption of wireless charging devices, and improve charging response speed. Summary of the Invention

[0008] The purpose of this paper is to improve existing wireless charging methods and devices to prevent blind spots in wireless communication tag detection, avoid damage to wireless communication tags, reduce standby power consumption of wireless charging devices, and improve charging response speed.

[0009] According to one aspect of this paper, a probe signal for detecting a power receiving device in wireless charging is proposed, the probe signal being configured to wake up the power receiving device in the wireless charging field and cause the power receiving device to generate a feedback signal based on a modulated wave of about 2 kHz, the duration of the probe signal being greater than 1 ms and less than 65 ms, and the probe signal being configured to identify the modulated wave.

[0010] Optionally, in some embodiments of the detection signal, the detection signal does not recognize the information content of the feedback signal.

[0011] According to another aspect of this paper, a wireless charging method for a wireless charging device is proposed, comprising the following steps: transmitting a first detection signal to detect the presence of a power receiving device in a wireless charging field; and when the presence of the power receiving device in the wireless charging field is detected, detecting the presence of a wireless communication tag in the wireless charging field. The first detection signal is configured to wake up the power receiving device in the wireless charging field and cause the power receiving device to generate a feedback signal based on a modulation wave of approximately 2 kHz. The duration of the first detection signal is greater than 1 millisecond and less than 65 milliseconds, and the first detection signal is configured to identify the modulation wave.

[0012] Optionally, in some embodiments of the wireless charging method, the first detection signal does not recognize the information content of the feedback signal.

[0013] Optionally, in some embodiments of the wireless charging method, the method further includes the following steps: periodically transmitting a second detection signal, different from the first detection signal, to detect the presence of an object in the wireless charging field before transmitting the first detection signal; and when the presence of the object in the wireless charging field is detected, performing the step of transmitting the first detection signal to determine whether the object is the power receiving device. The second detection signal is a simulated Ping.

[0014] Optionally, in some embodiments of the wireless charging method, the method periodically transmits the first detection signal to detect the presence of the power receiving device in the wireless charging field.

[0015] Optionally, in some embodiments of the wireless charging method, the method further includes the following steps: when the wireless communication tag is not detected in the wireless charging field, transmitting a third detection signal to wake up the power receiving device to cause the power receiving device to generate the feedback signal, identifying the information content of the feedback signal, and activating the wireless charging function to provide power to the power receiving device, wherein the third detection signal is a digital Ping; and when the wireless communication tag is detected in the wireless charging field, not activating the wireless charging function until the wireless communication tag is removed.

[0016] According to another aspect of this paper, a wireless charging device is proposed, comprising: a power transmission unit having a transmitting coil for providing power to a power receiving device in a wireless charging field; a wireless communication unit for detecting the presence of a wireless communication tag in the wireless charging field and communicating with the wireless communication tag; and a control unit for performing the following operations: controlling the power transmission unit to transmit a first detection signal to detect the presence of the power receiving device in the wireless charging field; and controlling the wireless communication unit to detect the presence of the wireless communication tag in the wireless charging field when the presence of the power receiving device is detected. The first detection signal is configured to wake up the power receiving device in the wireless charging field and cause the power receiving device to generate a feedback signal based on a modulation wave of approximately 2 kHz, the duration of the first detection signal being greater than 1 millisecond and less than 65 milliseconds, and the first detection signal being configured to identify the modulation wave.

[0017] Optionally, in some embodiments of the wireless charging device, the first detection signal does not recognize the information content of the feedback signal.

[0018] Optionally, in some embodiments of the wireless charging device, the control unit is further configured to perform the following operations: control the power transmission unit to periodically transmit a second detection signal to detect the presence of an object in the wireless charging field before transmitting the first detection signal; and when the object is detected in the wireless charging field, control the power transmission unit to transmit the first detection signal to determine whether the object is the power receiving device. The second detection signal is an analog Ping.

[0019] Optionally, in some embodiments of the wireless charging device, the control unit is further configured to control the power transmission unit to periodically transmit the first detection signal to detect the presence of the power receiving device in the wireless charging field.

[0020] Optionally, in some embodiments of the wireless charging device, when the wireless communication unit does not detect the wireless communication tag in the wireless charging field, it controls the power transmission unit to transmit a third detection signal to wake up the power receiving device so that the power receiving device generates the feedback signal, identifies the information content of the feedback signal, and starts the wireless charging function to provide power to the power receiving device, wherein the third detection signal is a digital Ping; and when the wireless communication unit detects the wireless communication tag in the wireless charging field, it does not cause the power transmission unit to start the wireless charging function until the wireless communication tag is removed.

[0021] Based on the detection signals provided in this paper, the wireless charging method and wireless charging device can prevent blind spots in the detection of wireless communication tags, avoid damage to wireless communication tags, reduce the standby power consumption of the wireless charging device, and improve the charging response speed. Attached Figure Description

[0022] The above and other features and advantages of the present invention will become more apparent from a detailed description of exemplary embodiments thereof with reference to the accompanying drawings.

[0023] Figure 1 The diagram illustrates a detection signal used in the prior art for detecting power receiving equipment.

[0024] Figure 2 The execution timing of the power receiving device detection function and the wireless communication tag detection function in the prior art is shown.

[0025] Figure 3 The workflow of Digital Ping is shown.

[0026] Figure 4 The workflow of DD Ping according to one embodiment of this document is illustrated.

[0027] Figure 5A A wireless charging method using DD Ping according to one embodiment of this document is illustrated.

[0028] Figure 5B It shows Figure 5A Timing of wireless charging methods.

[0029] Figure 6A A wireless charging method using DD Ping is shown according to another embodiment of this document.

[0030] Figure 6B It shows Figure 6A Timing of wireless charging methods.

[0031] Figure 7 A schematic diagram of a wireless charging device according to one embodiment of this document is shown.

[0032] Figure 8 It shows Figure 7 A structural block diagram of a wireless charging device. Detailed Implementation

[0033] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that the invention will be thorough and complete, and the concept of the exemplary embodiments will be fully conveyed to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed description will be omitted.

[0034] In describing the elements / components / etc. described and / or illustrated herein, the terms “a,” “an,” “the,” “the,” and “at least one” are used to indicate the presence of one or more elements / components / etc. The terms “comprising,” “including,” and “having” are used to indicate an open-ended inclusion and to mean that additional elements / components / etc. may exist in addition to those listed. Furthermore, the terms “first,” “second,” etc., in the claims are used only as designations and are not intended to limit the number of objects to which they pertain.

[0035] As mentioned above, existing power receiver detection is achieved by periodically transmitting digital Ping signals. However, only the Ping signal transmitted when a power receiver is detected is used to obtain information contained in the feedback signal transmitted by the power receiver, in order to establish a communication handshake between the power receiver and the wireless charging device. Ping signals transmitted at other times are only used to determine whether a power receiver is present in the wireless charging field; therefore, not all Ping signals are used to obtain information about the power receiver.

[0036] As discussed above, the duration of a digital ping is typically 65 to 70 milliseconds, providing enough energy to wake up the power receiver. Furthermore, the duration of a digital ping is long enough for the wireless charging device to acquire the basic information about the power receiver contained in the feedback signal emitted by the power receiver. In other words, even if it's not necessary to transmit digital pings for all periods to acquire information from the power receiver, transmitting a digital ping still requires at least a 65-millisecond wait and consumes more energy to acquire the information content of the feedback signal. Therefore, the use of digital ping results in higher power consumption for the wireless charging device in standby mode, slows down the response speed of the wireless charging device when the power receiver is placed in the wireless charging field, and the high power output of digital ping may damage wireless communication tags also placed in the wireless charging field.

[0037] As discussed above, the duration of an analog ping of less than 50 microseconds ensures that the power receiving device is not woken up, while the duration of a digital ping of 65 to 70 milliseconds is sufficient to wake up the power receiving device so that it can transmit a feedback signal with ASK signal encoding. The duration of a digital ping is long enough to allow further acquisition of the information contained in the feedback signal.

[0038] Based on the Qi wireless charging protocol, wireless charging uses a 2±4 kHz modulated wave communication method. Therefore, the ASK-coded feedback signal emitted by the power receiving device after it is woken up is based on a 2±4 kHz modulated wave.

[0039] Table 1 below shows the main structure of the communication packet for the feedback signal of the power receiving device.

[0040] Table 1. Main structure of the communication packet for feedback signals

[0041] prefix Baotou information check

[0042] As described in Table 1, the communication packet of the feedback signal of the power receiving device with ASK encoding mainly consists of four parts: prefix, header, information, and checksum. It is transmitted based on a modulated wave of 2±4 kHz. The prefix part consists of 11 to 25 coded "1"s, and the information part contains the basic information of the power receiving device.

[0043] Based on the above discussion, according to one embodiment of this paper, a detection signal for detecting the presence of a power receiving device in a wireless charging field is proposed. This detection signal will be referred to below as a "device detection signal" or "DD Ping (Device Detection Ping)". DD Ping differs from analog and digital Ping based on the Qi wireless charging protocol. The duration of DD Ping can be greater than 50 microseconds and less than 65 milliseconds; more specifically, the duration of DD Ping can be greater than 1 millisecond and less than 65 milliseconds. The duration of DD Ping can be set by a program or firmware stored in the wireless charging device. Furthermore, DD Ping is configured to recognize modulation waves of approximately 2 kHz, for example, modulation waves of 2 ± 4% kHz. Since the feedback signal emitted by the power receiving device is based on a modulation wave of approximately 2 kHz, once DD Ping determines the presence of a modulation wave of approximately 2 kHz in the wireless charging field, it can determine that the modulation wave was emitted by the power receiving device, and thus determine that the power receiving device is present in the wireless charging field.

[0044] DD Ping lasts longer than analog Ping (approximately 50 microseconds), thus transmitting enough energy to wake up power receivers in a wireless charging field, causing them to emit a feedback signal based on a modulation wave of approximately 2kHz. DD Ping lasts shorter than digital Ping (approximately 65 milliseconds). Therefore, DD Ping only needs to determine a very small portion of the prefix portion of the feedback signal emitted by the power receiver to confirm its presence in the wireless charging field. For example, DD Ping only needs to determine 1-2 coded "1"s (in the prefix portion) emitted based on a modulation wave of approximately 2kHz to confirm its presence. Optionally, DD Ping may not identify any information content in the feedback signal emitted by the power receiver. Therefore, compared to analog Ping, DD Ping can be used to accurately identify power receivers; compared to digital Ping, the duration of DD Ping is short enough not to be used to identify the information content of the feedback signal, i.e., the specific content of the information in the communication packet of the feedback signal, such as basic information about the power receiver. Therefore, using DD Ping results in faster response times and lower energy consumption for wireless charging devices.

[0045] Figure 3 The workflow of digital Ping based on the Qi charging protocol is shown. For example... Figure 3 As shown, after digital ping is initiated, in step S102, the wireless charging device starts power transfer. If a power receiving device is present in the wireless charging field, the power receiving device will be awakened by the transferred energy and transmit a feedback signal based on a modulation wave of approximately 2kHz. Next, in step S104, the wireless charging device attempts to collect the modulation wave signal in the wireless charging field. At this time, since the duration of digital ping is between 65 and 70 milliseconds, the wireless charging device needs to wait for at least 65 milliseconds to elapse. After the duration of digital ping ends, in step S106, the wireless charging device shuts down power transfer and begins analyzing the amplitude changes of the modulation wave to determine whether a feedback signal transmitted from the power receiving device has been detected. At this time, if the wireless charging device recognizes the feedback signal transmitted from the power receiving device, it will further perform the subsequent operations when the power receiving device exists in step S108, and end the digital Ping after the subsequent operations are completed; or, if the wireless charging device does not recognize the feedback signal transmitted from the power receiving device, it will perform the subsequent operations when the power receiving device does not exist in step S110, and end the digital Ping after the subsequent operations are completed.

[0046] Figure 4 The workflow of DD Ping as proposed in this paper is illustrated. Figure 4As shown, after DD Ping is initiated, in step S202, the wireless charging device starts energy transfer. If a power receiving device is present in the wireless charging field, the power receiving device will be awakened by the transferred energy and transmit a feedback signal based on a modulation wave of approximately 2kHz. Next, in step S204, the wireless charging device attempts to collect the modulation wave signal in the wireless charging field. Then, in step S206, the wireless charging device analyzes the amplitude changes of the modulation wave to determine whether a modulation wave of approximately 2kHz has been detected. At this point, if the wireless charging device detects a modulation wave of approximately 2kHz, it assumes the presence of a power receiving device in the wireless charging field and can, without waiting for the duration of DD Ping to end, shut off power transmission in step S208 and then proceed with subsequent operations when the power receiving device is present, ending DD Ping after the subsequent operations are completed. Alternatively, if the wireless charging device does not detect a modulation wave of approximately 2kHz, it can continuously detect the modulation wave of approximately 2kHz during the duration of DD Ping. If the wireless charging device does not detect the modulation wave of approximately 2kHz throughout the entire duration of DD Ping, it can shut off power transmission in step S210 and then proceed with subsequent operations when the power receiving device is absent, ending DD Ping after the subsequent operations are completed.

[0047] Therefore, compared to Figure 3 The workflow of the digital Ping is shown. Figure 4 The advantages of the DD Ping workflow shown are:

[0048] (1) Unlike the digital Ping workflow, which involves waiting for the duration to elapse, the DD Ping workflow eliminates the need for a DD Ping step. Once the DD Ping detects a modulation wave of approximately 2kHz, the wireless charging device can immediately shut down power transmission and proceed with subsequent operations as if the power receiving device were present. Even if the DD Ping initially fails to detect the approximately 2kHz modulation wave, the time used for timeout determination (i.e., the duration of the DD Ping) is shorter than the duration of the digital Ping. Therefore, based on the DD Ping workflow, the wireless charging device responds to the power receiving device much faster.

[0049] (2) The step of “determining whether a feedback signal is received from the power receiving device” in the workflow of DD Ping does not exist. In the workflow of DD Ping, it only identifies whether there is a modulation wave of about 2kHz in the wireless charging field, and no longer identifies the information content of the feedback signal. Therefore, the wireless charging device no longer consumes energy to identify the information content of the feedback signal, so the power consumption is lower.

[0050] Figure 5AA flowchart illustrating a wireless charging method using the DD Ping provided herein, according to one embodiment of this document, is shown. Figure 5B It shows Figure 5A The timing of the wireless charging method. The following will refer to... Figure 5A and Figure 5B Describe it.

[0051] In step S302, the wireless charging device periodically emits simulated Ping signals to detect the presence of objects in the wireless charging field. Optionally, similar to the above... Figure 2 The time-division detection function describes a process where, during the periodic transmission of simulated Pings, wireless communication tag (e.g., NFC card or RFID card) detection is performed after each simulated Ping or after a set of simulated Pings to detect the presence of a wireless communication tag in the wireless charging field. When a wireless communication tag is present, the wireless charging device can stop periodically transmitting simulated Pings and instead perform the function of communicating with the wireless communication tag. Optionally, during the periodic transmission of simulated Pings, DD Pings can be transmitted at predetermined time intervals to prevent missed simulated Pings.

[0052] When the wireless charging device detects an object in the wireless charging field using a simulated Ping, in step S304, the wireless charging device transmits a DD Ping to detect whether the object is a power receiving device such as a mobile phone. For example, such as Figure 5B As shown, when an object is detected by an analog Ping transmitted during time T1, a DD Ping can be transmitted immediately afterward during time T2 to determine if the object is a power receiving device. Due to the short duration of DD Ping and the fact that it only recognizes modulated waves of about 2kHz, DD Ping has a faster response time and lower power consumption.

[0053] If the transmitted DD Ping fails to detect a modulation wave of approximately 2kHz within its duration, it is assumed that the object detected by the simulated Ping is not a power receiving device, and the process returns to step S302 to continue periodically transmitting simulated pings. If the transmitted DD Ping detects a modulation wave of approximately 2kHz within its duration, it is assumed that the object detected by the simulated Ping is a power receiving device. In this case, a wireless communication tag detection function is performed in step S306 to confirm whether the wireless communication tag is also present in the wireless charging field before initiating the charging function to charge the power receiving device. For example, as... Figure 5BAs shown, when the DD Ping transmitted during period T2 detects a modulation wave of approximately 2kHz and confirms the presence of the power receiving device, a wireless communication tag detection function is first executed during period T3 to confirm whether the wireless communication tag also exists in the wireless charging field. The wireless communication tag detection uses a different detection method than the DD Ping.

[0054] When the wireless communication tag detection function executed in step S306 fails to detect a wireless communication tag, in step S308, the wireless charging device activates the wireless charging function and transmits a digital Ping to wake up the power receiving device, causing the power receiving device to generate a feedback signal. The wireless charging device then identifies basic information about the power receiving device in the feedback signal and establishes a communication handshake between the power receiving device and the wireless charging device based on this basic information. Next, in step S310, power is supplied to the power receiving device. For example, as... Figure 5B As shown, when the wireless communication tag detection function executed in time period T3 fails to detect the wireless communication tag, the wireless charging function is then activated in the subsequent time period T4 and a digital Ping is transmitted. The transmitted digital Ping wakes up the power receiving device present in the wireless charging field, obtains the feedback signal from the power receiving device, and establishes a communication handshake based on the feedback signal. Finally, in time period T5, a high-power energy transfer is performed to the power receiving device to charge it.

[0055] When the wireless communication tag detection function executed in step S306 detects a wireless communication tag, then in step S312, the wireless charging device can perform other functions to communicate with the wireless communication tag. Additionally or alternatively, the wireless charging device can also transmit information to the user indicating that a wireless communication tag has been detected so that the wireless charging function is not activated until the wireless communication tag is removed.

[0056] according to Figure 5A and Figure 5BThe described wireless charging method first performs a wireless communication tag detection function after detecting a power receiving device to determine whether both the wireless communication tag and the power receiving device are present in the wireless charging field. Only when no wireless communication tag is present in the wireless charging field, and only the power receiving device is present, is a digital Ping transmitted to obtain basic information about the power receiving device for charging. Therefore, it avoids the potential blind spots in wireless communication tag detection that may exist in existing technologies that alternate between power receiving device detection and wireless communication tag detection in a time-sharing manner, thus preventing the wireless charging device from damaging the wireless communication tag. Furthermore, the method provided in this paper replaces the existing time-sharing detection operation by periodically sending simulated Ping and periodically performing wireless communication tag detection (or by periodically sending a combination of simulated Ping and DD Ping and periodically performing wireless communication tag detection). When an object is detected, DD Ping is used instead of digital Ping to determine whether the detected object is a power receiving device. This method has a faster response speed, lower power consumption, and avoids damage to the wireless communication tag caused by digital Ping.

[0057] Figure 6A A flowchart illustrating a wireless charging method using the DD Ping provided herein, according to another embodiment of this document, is shown. Figure 6B Shown Figure 6A The timing of the wireless charging method. The following will refer to... Figure 6A and Figure 6B Describe it.

[0058] In step S402, the wireless charging device periodically transmits DD Ping to detect the presence of a power receiving device in the wireless charging field. Optionally, similar to the above... Figure 2 The mid-time detection function describes a process where, during the periodic transmission of DD Ping, and after the transmission of DD Ping or a set of DD Ping, wireless communication tag detection (e.g., NFC card or RFID card) is performed to detect the presence of a wireless communication tag in the wireless charging field. When a wireless communication tag is present, the wireless charging device can stop subsequent wireless charging functions (e.g., stop periodically transmitting DD Ping) and instead perform functions that communicate with the wireless communication tag. Due to the short duration of DD Ping and its recognition of only approximately 2kHz modulated waves, DD Ping offers faster response and lower power consumption compared to digital Ping.

[0059] If the transmitted DD Ping fails to detect a modulation wave of approximately 2kHz within its duration, it is assumed that the power receiving device is not present in the wireless charging field, and DD Ping transmissions continue periodically. If the transmitted DD Ping detects a modulation wave of 2kHz within its duration, it is assumed that the power receiving device is present in the wireless charging field. In this case, a wireless communication tag detection function is performed in step S404 to confirm whether the wireless communication tag is also present in the wireless charging field before initiating wireless charging to charge the power receiving device. For example, as... Figure 6B As shown, when the presence of the power receiving device is determined by identifying a modulated wave of about 2kHz through the DD Ping transmitted in the T1 period, the wireless communication tag detection function is performed in the T2 period to confirm whether the wireless communication tag is also present in the wireless charging field.

[0060] If the wireless communication tag detection function executed in step S404 fails to detect a wireless communication tag, then in step S406, the wireless charging device activates its wireless charging function and transmits a digital Ping to wake up the power receiving device, causing the power receiving device to generate a feedback signal. The wireless charging device then identifies basic information about the power receiving device in the feedback signal and establishes a communication handshake between the power receiving device and the wireless charging device based on this basic information. Next, in step S408, power is supplied to the power receiving device. For example, as... Figure 6B As shown, when the wireless communication tag detection function executed in time period T2 fails to detect a wireless communication tag, the wireless charging function is then activated in the subsequent time period T3 and a digital Ping is transmitted. The transmitted digital Ping wakes up the power receiving device present in the wireless charging field, obtains the information content of the feedback signal from the power receiving device, and establishes a communication handshake based on the information content of the feedback signal. Finally, in time period T4, a high-power energy transfer is performed to the power receiving device to charge the power receiving device.

[0061] When the wireless communication tag detection function executed in step S404 detects a wireless communication tag, then in step S410, the wireless charging device can perform other functions to communicate with the wireless communication tag. Additionally or alternatively, the wireless charging device can also transmit information to the user indicating that a wireless communication tag has been detected so that the suspended wireless charging function is not activated until the wireless communication tag is removed.

[0062] according to Figure 6A and Figure 6BThe described wireless charging method forcibly suspends the wireless charging function after detecting a power receiving device and performs an additional wireless communication tag detection function to determine whether both the wireless communication tag and the power receiving device are present in the wireless charging field. Only when no wireless communication tag is present in the wireless charging field, and only the power receiving device is present, is a digital Ping transmitted to obtain basic information about the power receiving device for charging. Therefore, it avoids the potential blind spots in wireless communication tag detection that may exist in existing technologies that alternate between power receiving device detection and wireless communication tag detection in a time-sharing manner, thus preventing the wireless charging device from damaging the wireless communication tag. Furthermore, the method provided in this paper replaces the existing time-sharing detection operation with periodic DD Ping transmissions and periodic wireless communication tag detection, which offers faster response speeds, lower power consumption, and avoids damage to the wireless communication tag caused by digital Ping.

[0063] Figure 7 A schematic diagram of a wireless charging device 10 according to one embodiment of this document is shown. Figure 8 A structural block diagram of the wireless charging device 10 is shown.

[0064] exist Figure 7 and Figure 8 In this configuration, the wireless charging device 10 can wirelessly transmit power to the receiving coil 21 of the power receiving device 20 (e.g., a mobile phone) via the transmitting coil 111 of the power transmission unit 110. In other words, for example, the wireless charging device 10 may include a transmitting coil 111, which may be magnetically coupled to the receiving coil 21 to wirelessly transmit power to the power receiving device 20. Furthermore, in addition to the power receiving device 20, a wireless communication tag 30 (e.g., an NFC card or RFID card) may also be present adjacent to the wireless charging device 10. The communication coil 121 of the wireless communication unit 120 of the wireless charging device 10 and the communication coil 31 of the wireless communication tag 30 are magnetically coupled to perform information transmission.

[0065] The controller 130 of the wireless charging device 10 can be coupled to the power transmission unit 110 and the wireless communication unit 120 to control the operation of the power transmission unit 110 and the wireless communication unit 120. For example, the controller 130 may have a processor and a memory storing instructions or programs. When the processor executes the instructions or programs stored in the memory, the processor can control the power transmission unit 110 and the wireless communication unit 120 to perform specific operations.

[0066] The controller 130 can control the power transmission unit 110 to transmit the DD Ping described above to detect the presence of the power receiving device 20 in the wireless charging field. The controller 130 can also control the wireless communication unit 120 to detect the presence of the wireless communication tag 30 in the wireless charging field.

[0067] Optionally, controller 130 can perform a combination Figure 5A and Figure 5B The wireless charging method involves the controller 130 controlling the transmitting coil 111 of the power transmission unit 110 to periodically transmit simulated Pings to detect the presence of objects in the wireless charging field. During the periodic transmission of simulated Pings by the transmitting coil 111, the controller 130 can control the wireless communication unit 120 to perform a wireless communication tag detection operation after each simulated Ping or after a set of simulated Pings, to detect the presence of a wireless communication tag 30 in the wireless charging field. When a wireless communication tag is present, the controller 130 can control the power transmission unit 110 to stop periodically transmitting simulated Pings and instead control the wireless communication unit 120 to perform communication with the wireless communication tag 30 via the communication coil 121. Optionally, during the periodic transmission of simulated Pings by the transmitting coil 111, the controller 130 can control the transmitting coil 111 of the power transmission unit 110 to transmit DD Pings at predetermined time intervals to prevent missed simulated Ping detections.

[0068] When the simulated Ping emitted by the transmitting coil 111 detects an object in the wireless charging field, the controller 130 can control the transmitting coil 111 to emit a DD Ping to detect whether the object is a power receiving device 20, such as a mobile phone. If the DD Ping emitted by the transmitting coil 111 fails to detect a modulated wave of approximately 2kHz within its duration, it is considered that the object detected by the simulated Ping is not a power receiving device 20, and the controller 130 can control the transmitting coil 111 to continue periodically emitting simulated pings.

[0069] When the DD Ping emitted by the transmitting coil 111 detects a modulated wave of about 2kHz within its duration, it is considered that the object detected by the simulated Ping is the power receiving device 20. The controller 130 controls the wireless communication unit 120 to perform the wireless communication tag detection function to confirm whether the wireless communication tag 30 also exists in the wireless charging field before using the power transmission unit 110 to perform charging.

[0070] When the wireless communication unit 120 does not detect the wireless communication tag 30, the controller 130 then controls the power transfer unit 110 to activate the wireless charging function and wakes up the power receiving device 20 by transmitting a digital Ping signal through the transmitting coil 111, causing the power receiving device 20 to generate a feedback signal. The controller 130 can then identify basic information about the power receiving device in the feedback signal and establish a communication handshake between the power receiving device 20 and the power transfer unit 110 based on this basic information. Next, the controller 130 controls the transmitting coil 110 to provide power to the power receiving device 20 at high power.

[0071] When the wireless communication unit 120 detects the wireless communication tag 30, the controller 130 can then control the wireless communication unit 120 to perform other functions for communicating with the wireless communication tag 30. Additionally or alternatively, the controller 130 can also transmit information to the user indicating that the wireless communication tag has been detected so that the power transmission unit 110 is not activated for wireless charging until the wireless communication tag is removed.

[0072] Optionally, the controller 130 can also perform combined Figure 6A and Figure 6B The wireless charging method involves the controller 130 controlling the transmitting coil 111 of the power transmission unit 110 to periodically transmit DD Pings to detect the presence of a power receiving device 20 in the wireless charging field. During the periodic transmission of DD Pings by the transmitting coil 111, the controller 130 can control the wireless communication unit 120 to perform a wireless communication tag detection operation after each DD Ping or after a group of DD Pings is transmitted by the power transmission unit 110, to detect the presence of a wireless communication tag 30 in the wireless charging field. When a wireless communication tag is present, the controller 130 can control the power transmission unit 110 to stop periodically transmitting DD Pings and instead control the wireless communication unit 120 to perform the function of communicating with the wireless communication tag 30 via the communication coil 121.

[0073] If the DD Ping emitted by the transmitting coil 111 fails to detect a modulation wave of approximately 2kHz within its duration, it is assumed that the power receiving device 20 does not exist in the wireless charging field, and the controller 130 can then control the transmitting coil 111 to continue periodically emitting DD Ping.

[0074] When the DD Ping emitted by the transmitting coil 111 detects a modulated wave of about 2kHz within its duration, it is assumed that the power receiving device 20 exists in the wireless charging field. Then, the controller 130 controls the wireless communication unit 120 to perform the wireless communication tag detection function to confirm whether the wireless communication tag 30 also exists in the wireless charging field before using the power transmission unit 110 to perform charging.

[0075] When the wireless communication unit 120 does not detect the wireless communication tag 30, the controller 130 then controls the power transfer unit 110 to activate the wireless charging function and wakes up the power receiving device 20 by transmitting a digital Ping signal through the transmitting coil 111, causing the power receiving device 20 to generate a feedback signal. The controller 130 can then identify basic information about the power receiving device in the feedback signal and establish a communication handshake between the power receiving device 20 and the power transfer unit 110 based on this basic information. Next, the controller 130 controls the transmitting coil 110 to provide power to the power receiving device 20 at high power.

[0076] When the wireless communication unit 120 detects the wireless communication tag 30, the controller 130 can then control the wireless communication unit 120 to perform other functions that communicate with the wireless communication tag 30. Alternatively or additionally, the controller 130 can also transmit information to the user indicating that the wireless communication tag 30 has been detected so that the power transmission unit 110 is not activated for the suspended wireless charging function until the wireless communication tag 30 is removed.

[0077] As discussed above, the wireless charging device uses the DD Ping provided in this article, which can prevent blind spots in wireless communication tag detection, avoid damage to wireless communication tags, reduce standby power consumption, and improve charging response speed.

[0078] Although the foregoing describes an implementation of this disclosure, other and further implementations of this disclosure may be devised without departing from the basic scope of this disclosure, and the scope of this disclosure is defined by the appended claims.

Claims

1. A method for detecting a power receiving device in wireless charging, characterized in that, The method includes: Transmit a detection signal to detect the presence of the power receiving device in the wireless charging field, wherein The detection signal is configured to wake up the power receiving device in the wireless charging field and cause the power receiving device to generate a feedback signal based on a modulated wave of about 2 kHz. The duration of the detection signal is greater than 1 millisecond and less than 65 milliseconds; and The duration of the detection signal is short enough to identify only the modulation wave of the feedback signal without identifying the information content of the feedback signal at all.

2. A wireless charging method for a wireless charging device, characterized in that, Include: Transmit a first detection signal to detect the presence of power receiving devices in the wireless charging field; and When the presence of the power receiving device is detected in the wireless charging field, the presence of the wireless communication tag in the wireless charging field is also detected, wherein... The first detection signal is configured to wake up the power receiving device in the wireless charging field and cause the power receiving device to generate a feedback signal based on a modulated wave of about 2 kHz. The duration of the first detection signal is greater than 1 millisecond and less than 65 milliseconds; and The duration of the first detection signal is short enough to identify only the modulation wave of the feedback signal without identifying the information content of the feedback signal at all.

3. The method of claim 2, further comprising: Before transmitting the first detection signal, a second detection signal, different from the first detection signal, is periodically transmitted to detect the presence of objects in the wireless charging field; and When the object is detected in the wireless charging field, the step of transmitting the first detection signal is performed to determine whether the object is the power receiving device. The second detection signal is a simulated Ping.

4. The method according to claim 2, wherein The first detection signal is periodically emitted to detect the presence of the power receiving device in the wireless charging field.

5. The method according to any one of claims 2-4, further comprising: When the wireless communication tag is not detected in the wireless charging field, a third detection signal is transmitted to wake up the power receiving device, causing the power receiving device to generate the feedback signal. The information content of the feedback signal is identified, and the wireless charging function is activated to provide power to the power receiving device. The third detection signal is a digital Ping. When the wireless communication tag is detected in the wireless charging field, the wireless charging function is not activated until the wireless communication tag is removed.

6. A wireless charging device, characterized in that, Include: The power transmission unit has a transmitting coil for supplying power to a power receiving device in a wireless charging field; A wireless communication unit is used to detect the presence of a wireless communication tag in the wireless charging field and to communicate with the wireless communication tag. and Control unit, used to perform the following operations: The power transmission unit is controlled to transmit a first detection signal to detect the presence of the power receiving device in the wireless charging field, and When the presence of the power receiving device is detected in the wireless charging field, the wireless communication unit is controlled to detect the presence of the wireless communication tag in the wireless charging field, wherein... The first detection signal is configured to wake up the power receiving device in the wireless charging field and cause the power receiving device to generate a feedback signal based on a modulated wave of about 2 kHz. The duration of the first detection signal is greater than 1 millisecond and less than 65 milliseconds; and The duration of the first detection signal is short enough to identify only the modulation wave of the feedback signal without identifying the information content of the feedback signal at all.

7. The wireless charging device according to claim 6, wherein the control unit is further configured to perform the following operations: The power transmission unit is controlled to periodically transmit a second detection signal before transmitting the first detection signal to detect the presence of objects in the wireless charging field; and When the object is detected in the wireless charging field, the power transmission unit is controlled to transmit the first detection signal to determine whether the object is the power receiving device. The second detection signal is a simulated Ping.

8. The wireless charging device according to claim 6, wherein the control unit is further configured to control the power transmission unit to periodically transmit the first detection signal to detect the presence of the power receiving device in the wireless charging field.

9. The wireless charging device according to any one of claims 6-8, wherein the control unit is further configured to perform the following operations: When the wireless communication unit does not detect the wireless communication tag in the wireless charging field, it controls the power transmission unit to transmit a third detection signal to wake up the power receiving device, causing the power receiving device to generate the feedback signal, identify the information content of the feedback signal, and activate the wireless charging function to provide power to the power receiving device. The third detection signal is a digital Ping. When the wireless communication unit detects the wireless communication tag in the wireless charging field, it does not enable the power transmission unit to start the wireless charging function until the wireless communication tag is removed.

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