A wireless charging circuit and system and a device to be charged

Abstract

The embodiment of the present application discloses a wireless charging circuit and system and a device to be charged. The circuit includes: a rectifier connected to a receiving antenna, used to receive a charging signal output by an antenna array of a wireless charging device through the receiving antenna, and convert the charging signal into a DC signal; a power management chip connected to the rectifier, used to convert the DC signal into electrical energy; a detection unit, used to detect whether the charging signal output by the antenna array is focused on the device to be charged, and output a detection signal; a notification unit, connected to the detection unit, used to receive the detection signal, and according to the detection signal, notify the wireless charging device whether to increase the transmission power of the charging signal.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of wireless power transmission, and in particular to a wireless charging circuit and system and a device to be charged. Background Art

[0002] At present, wireless charging technology has been widely used in products such as mobile phones, watches, bracelets, Bluetooth headsets and even electric vehicles. Wireless charging technology can be divided into two types: low-power wireless charging and high-power wireless charging. Low-power wireless charging often uses electromagnetic induction, such as charging mobile phones; high-power wireless charging often uses resonance, such as charging electric vehicles. Since the charger and the power device transmit power through the magnetic field, there is no need for wires to connect the two, which makes it more convenient to charge the power device and makes the appearance design of the power device more beautiful.

[0003] Due to the convenience of wireless charging and the popularity of smart devices, how to charge smart devices more efficiently is an urgent problem to be solved. Summary of the invention

[0004] In order to solve any of the above technical problems, the embodiments of the present application provide a wireless charging circuit and system and a device to be charged.

[0005] In order to achieve the purpose of the embodiment of the present application, the embodiment of the present application provides a wireless charging circuit, including:

[0006] A rectifier, connected to the receiving antenna, configured to receive a charging signal output by the antenna array of the wireless charging device through the receiving antenna, and convert the charging signal into a DC signal;

[0007] A power management chip, connected to the rectifier, for converting the DC signal into electrical energy;

[0008] A detection unit, used to detect whether the charging signal output by the antenna array is focused on the device to be charged, and output a detection signal;

[0009] The notification unit is connected to the detection unit and is used to receive the detection signal and notify the wireless charging device whether to increase the transmission power of the charging signal according to the detection signal.

[0010] A device to be charged comprises the circuit described above.

[0011] A wireless charging system comprises the device to be charged and a wireless charging apparatus as described above.

[0012] One of the above technical solutions has the following advantages or beneficial effects:

[0013] By detecting whether the charging signal output by the antenna array is focused on the device to be charged, it is determined whether to notify the wireless charging device to increase the transmission power of the charging signal to compensate for the insufficient energy caused by the unfocused charging signal, improve the charging efficiency of the device to be charged, and shorten the duration of wireless charging.

[0014] Other features and advantages of the embodiments of the present application will be described in the subsequent description, and partly become apparent from the description, or can be understood by implementing the embodiments of the present application. The purpose and other advantages of the embodiments of the present application can be achieved and obtained by the structures specifically pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide further understanding of the technical solutions of the embodiments of the present application and constitute a part of the specification. Together with the embodiments of the embodiments of the present application, they are used to explain the technical solutions of the embodiments of the present application and do not constitute a limitation on the technical solutions of the embodiments of the present application.

[0016] Figure 1(a) is a schematic diagram of the path of a beacon signal;

[0017] Figure 1(b) is a schematic diagram of the path of the charging signal;

[0018] Figure 2 is a schematic diagram of a wireless charging system 100;

[0019] Figure 3 for Figure 2 A schematic diagram of the circuit structure of the device to be charged 20 in the system shown;

[0020] FIG4( a ) is a schematic diagram of the RF transmission path of the charging signal at time t1;

[0021] FIG4( b ) is a schematic diagram of the RF transmission path of the charging signal at time t2;

[0022] Figure 5 A schematic diagram of a wireless charging circuit provided in an embodiment of the present application;

[0023] Figure 6 for Figure 5 A schematic diagram of the structure of the detection unit 226 in the circuit shown;

[0024] Figure 7 for Figure 5 Another structural schematic diagram of the detection unit 226 in the circuit shown;

[0025] Figure 8 for Figure 5 Another structural schematic diagram of the circuit shown;

[0026] Fig. 9 for Figure 5 Another structural schematic diagram of the circuit shown;

[0027] Fig.10 This is a schematic diagram of the application of the wireless charging circuit 22 provided in an embodiment of the present application. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiments of the present application more clear, the embodiments of the present application will be described in detail in conjunction with the accompanying drawings. It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other arbitrarily.

[0029] Wireless Power Transfer (WPT) converts radio frequency power into direct current through a rectifier, which is then used to charge the battery or directly power the components of electronic devices.

[0030] The WPT system includes: a WPT source (Source), as a power provider (Power Provider), used to provide radio frequency power; and a WPT client (Client), as a power provider (Power Receiver), used to receive radio frequency power.

[0031] The WPT Client has a built-in antenna for charging, which transmits beacon signals omnidirectionally. Part of the signal reaches the WPT Source after direct or reflected radiation. The signal path is shown in Figure 1(a).

[0032] The WPT Source adjusts the transmission parameters of the charging signal according to the received beacon signal, so that the charging signal transmitted by the WPT Source can be sent in the reverse direction along the path of the WPT Client's transmission signal, that is, the path shown in Figure 1(b). Since the energy of the WPT Source's transmission signal is focused on the antenna of the WPT Client after direct / reflection, the purpose of concentrating the transmission energy on the WPT Client is achieved. Among them, the higher the degree of energy concentration at the antenna of the WPT Client, the higher the transmission efficiency of the WPTSource.

[0033] Since the parameters of the WPT Source's transmitted signal are partially derived from the WPT Client's beacon signal, they will change as the characteristics of the received beacon signal change. For example, if the WPT Client moves, the WPT Source will update the parameters of the transmitted signal so that the WPT Source's charging signal is focused again at the new position of the WPT Client.

[0034] In the above system, the WPT source is a wireless charging device, and the WPT Client is a device to be charged.

[0035] Figure 2 Schematic diagram of wireless charging system 100. Figure 2 As shown, the wireless charging system 100 includes a wireless charging device 10 and a device to be charged 20, wherein:

[0036] The wireless charging device 10 includes a first charging module and a beacon receiving module; wherein:

[0037] A first charging module, used to convert current into a charging signal and output it in the form of a radio frequency signal;

[0038] The beacon receiving module is used to receive the beacon signal transmitted omnidirectionally by the device to be charged.

[0039] The device to be charged 20 includes a second charging module and a beacon transmitting module; wherein:

[0040] A second charging module, used for converting the charging signal received by the antenna into a direct current;

[0041] The beacon transmitting module is used to transmit beacon signals omnidirectionally using the current charging antenna.

[0042] Figure 3 for Figure 2 The circuit diagram of the device 20 to be charged in the system is shown in FIG. Figure 3 As shown, the device to be charged 20 includes an antenna 21, a wireless charging circuit 22 and a battery 23; wherein:

[0043] Antenna 21, used for transmitting Beacon signals and receiving charging signals;

[0044] The wireless charging circuit 22 is used to perform wireless charging using the charging signal and instruct the wireless charging device 10 to adjust the transmission power of the charging signal through the Beacon signal.

[0045] The battery 23 is connected to the wireless charging circuit 22 and is used to store electrical energy.

[0046] Furthermore, the wireless charging circuit 22 includes:

[0047] A rectifier 221, used to convert the radio frequency signal into a direct current signal;

[0048] The power management chip 222 is used to input the input DC signal to the battery, or to step down / boost the input voltage signal and then provide it to the power input terminal of other modules;

[0049] An oscillator 223, used to generate a sine wave as a signal source of a beacon signal;

[0050] The signal processor 224 is used to output a control signal to control various functional modules of the WTP Client.

[0051] The switch device 225 is used to realize that Beacon signal transmission and charging signal reception share the same antenna.

[0052] At time t1, the WPT Client and the WPT Source are far enough apart that the charging signal output by the antenna array of the WPT Source can be focused at the WPT Client. The RF transmission path is shown in Figure 4(a). At time t2, the WPT Client and the WPT Source are very close. The charging signal output by the antenna array of the WPT Source cannot be focused at the WPT Client. The RF transmission path is shown in Figure 4(b).

[0053] From the RF transmission paths shown in Figures 4(a) and 4(b), it can be seen that when the distance between the WPT Client and the WPT Source is very close, the WPT Client is only within the partial coverage of the WPT Source's antenna array. Because the energy of the charging signal emitted by the antenna array cannot be focused at the WPT Client, the energy received by the WPT Client's charging antenna is reduced, the charging current becomes smaller, and the charging time increases.

[0054] Based on the above technical problems, the embodiments of the present application provide the following solutions:

[0055] Figure 5 Schematic diagram of a wireless charging circuit 22 provided in an embodiment of the present application. Figure 5 As shown, the wireless charging circuit 22 includes a rectifier 221, a power management chip 222, a detection unit 226 and a notification unit 227; wherein:

[0056] The rectifier 221 is connected to the receiving antenna 211, and is used to receive the charging signal output by the antenna array of the wireless charging device 10 through the receiving antenna 211, and convert the charging signal into a DC signal;

[0057] The power management chip 222 is connected to the rectifier 221 and is used to convert the DC signal into electrical energy; wherein the power management chip 222 can store the converted electrical energy in a battery or directly provide it to a power-consuming module in the device to be charged 20; the power-consuming module can be a processor, a camera module or a communication module (such as a WIFI module, a Bluetooth module, etc.).

[0058] A detection unit 226, used to detect whether the charging signal output by the antenna array is focused on the device to be charged 20, and output a detection signal;

[0059] Specifically, if the charging signal can be focused on the device to be charged 20, it means that the energy of the charging signal received by the receiving antenna 221 is sufficient and has good charging efficiency, and there is no need to increase the transmission power of the charging signal; otherwise, it means that the energy of the charging signal received by the receiving antenna 221 is insufficient and the charging efficiency needs to be improved, then it is necessary to increase the transmission power of the charging signal.

[0060] The notification unit 227 is connected to the detection unit 226 and is used to receive a detection signal and notify the wireless charging device 10 whether to increase the transmission power of the charging signal according to the detection signal.

[0061] Specifically, if the charging signal is not focused on the device to be charged 20, the energy of the charging signal currently received by the receiving antenna 211 needs to be further improved. Therefore, it is necessary to notify the wireless charging device 10 to increase the transmission power of the charging signal to compensate for the insufficient energy caused by the unfocused charging signal.

[0062] The circuit provided in the embodiment of the present application determines whether to notify the wireless charging device 10 to increase the transmission power of the charging signal by detecting whether the charging signal output by the antenna array is focused on the device to be charged 20, so as to compensate for the insufficient energy caused by the unfocused charging signal, improve the charging efficiency of the device to be charged 20, and shorten the duration of wireless charging.

[0063] The circuit provided in the embodiment of the present application is described below:

[0064] Figure 6 for Figure 5 The schematic diagram of the structure of the detection unit 226 in the circuit shown. Figure 6 As shown, the detection unit 226 includes a first detection subunit, a first judgment subunit and a first output subunit connected in sequence, wherein the first detection subunit is connected to the receiving antenna 231. The operations performed by the above functional units are as follows:

[0065] The first detection unit receives the charging signal from the receiving antenna 231 and detects the receiving power of the charging signal. By detecting the power of the received charging signal, judgment data is provided for judging whether the charging signal output by the antenna array is focused on the device to be charged.

[0066] The first judgment subunit judges whether the received power is less than a preset first threshold value, and obtains a first judgment result; wherein the first threshold value is the power value of the charging signal output by the antenna array when the charging device 20 is focused;

[0067] Specifically, the first threshold value can be obtained according to a test operation and pre-written into the storage space of the device to be charged 20;

[0068] If the first judgment result is that the received power is less than the first threshold, it means that the charging signal output by the antenna array is not focused on the device to be charged 20; otherwise, it means that the charging signal output by the antenna array is focused on the device to be charged 20.

[0069] The first output subunit outputs the detection signal according to the first judgment result.

[0070] In the above embodiment, the charging signal is received from the receiving antenna 211, and whether the charging signal output by the antenna array is focused on the device to be charged 20 is determined based on the received power of the charging signal. This can quickly determine whether the charging signal is focused on the device to be charged 20, thereby improving the judgment efficiency.

[0071] The charging signal is not focused on the device to be charged 20 because the distance between the device to be charged 20 and the wireless charging device 10 is too close. If the position of the device to be charged does not change, or the relative distance does not change, it is usually impossible to change the charging signal from an unfocused state to a focused state on the device to be charged 20. Because even if the transmission power of the charging signal is increased to a large enough level, the receiving power of the charging signal cannot reach the first threshold, and as the transmission power continues to increase, the power of the received charging signal can be increased by a smaller and smaller amount. Therefore, if the increase in the transmission power of the charging signal is not limited, the power consumption of the wireless charging device 10 will increase, and the energy utilization efficiency of the wireless charging device 10 will be reduced.

[0072] Based on the above analysis, in an exemplary embodiment, the detection unit 226 further includes a second judgment subunit connected to the first judgment subunit.

[0073] Specifically, when the first judgment result is that the received power is less than the first threshold, it is judged whether the received power is greater than a preset second threshold to obtain a second judgment result; wherein the second threshold is the maximum power of the charging signal output by the antenna array when the device to be charged 20 is not focused.

[0074] Wherein, the first output subunit is connected to the second judgment subunit, and is used to output the detection signal according to the second judgment result.

[0075] In the above embodiment, the second threshold value may be obtained according to a test operation and pre-written into the storage space of the device to be charged 20 .

[0076] If the second judgment result is that the received power is greater than the second threshold, the transmission power of the charging signal has increased sufficiently and does not need to be increased further; otherwise, the transmission power of the charging signal may continue to be increased.

[0077] Combination Figure 6 It can be seen from the structure shown that when the first judgment unit determines that the received power is greater than or equal to the first threshold, the notification unit 227 notifies the wireless charging device not to increase the transmission power of the charging signal. When the first judgment unit determines that the received power is less than the first threshold, the notification unit 227 notifies the wireless charging device 10 to increase the transmission power of the charging signal; after the wireless charging device 10 starts to increase the transmission power of the charging signal, as long as the second judgment unit determines that the received power is less than the second threshold, the notification unit 227 notifies the wireless charging device to increase the transmission power of the charging signal, until the second judgment unit determines that the received power is greater than or equal to the second threshold, the notification unit 227 notifies the wireless charging device not to increase the transmission power of the charging signal.

[0078] Through the above analysis, it can be known that the control logic of the transmission power of the wireless charging device 10 is as follows:

[0079] Step A1: when it is determined that the received power is less than the first threshold, notify the wireless charging device 10 to increase the transmission power of the charging signal;

[0080] Step A2: after the transmission power increases, determining whether the received power of the charging signal is greater than a second threshold;

[0081] If it is greater than the second threshold, execute step A3; otherwise, execute step A4.

[0082] Step A3: notify the wireless charging device 10 not to increase the transmission power of the charging signal any more, and the process ends.

[0083] Step A4: notify the wireless charging device 10 to continue increasing the transmission power of the charging signal, and execute step A2.

[0084] In the above embodiment, when the first judgment result is that the received power is less than the first threshold, it is judged whether the received power is greater than a preset second threshold to control whether to stop increasing the transmission power of the charging signal, thereby reducing the power consumption of the wireless charging device 10 and improving the energy utilization efficiency of the wireless charging device 10.

[0085] Figure 7 for Figure 5 Another schematic diagram of the structure of the detection unit 226 in the circuit shown. Figure 7As shown, the detection unit includes a second detection subunit, a third judgment subunit and a third output subunit connected in sequence, wherein the second detection subunit is connected to the output end of the rectifier. The operations performed by the above functional units are as follows:

[0086] The first detection unit receives a DC signal from the rectifier 221 and detects the current value of the DC signal; by detecting the current value of the received DC signal, it provides judgment data for determining whether the charging signal output by the antenna array is focused on the device to be charged.

[0087] The third judgment subunit judges whether the current value is less than a preset third threshold value, and obtains a third judgment result, wherein the third threshold value is the current value of the charging signal output by the antenna array when the charging device to be charged is focused;

[0088] Specifically, the third threshold value can be obtained according to the test operation and pre-written into the storage space of the device to be charged 20;

[0089] If the third judgment result is that the received power is less than the third threshold, it means that the charging signal output by the antenna array is not focused on the device to be charged 20; otherwise, it means that the charging signal output by the antenna array is focused on the device to be charged 20.

[0090] The third output subunit is connected to the third judgment subunit, and is used to output the detection signal according to the third judgment result.

[0091] In the above embodiment, a DC signal is received from the rectifier 221, and whether the charging signal output by the antenna array is focused on the device to be charged 20 is judged according to the current value of the DC signal. This can quickly determine whether the charging signal is focused on the device to be charged 20, thereby improving the judgment efficiency.

[0092] The charging signal is not focused on the device to be charged 20 because the distance between the device to be charged 20 and the wireless charging apparatus 10 is too close. If the position of the device to be charged does not change, or the relative distance does not change, it is usually impossible to change the charging signal from an unfocused state to a focused state on the device to be charged 20. Because even if the transmission power of the charging signal is increased to a large enough level, the receiving power of the charging signal cannot reach the first threshold, and as the transmission power continues to increase, the increase in the receiving power will become smaller and smaller. Therefore, if the increase in the transmission power of the charging signal is not limited, the power consumption of the wireless charging apparatus 10 will increase, and the energy utilization efficiency of the wireless charging apparatus 10 will be reduced.

[0093] Based on the above analysis, in an exemplary embodiment, the detection unit 226 further includes a second judgment subunit, wherein the second judgment unit is connected to the first judgment subunit, and is used to judge whether the current value is less than a preset fourth threshold value, and obtain a fourth judgment result; wherein the fourth threshold value is the maximum current value of the charging signal output by the antenna array when the device to be charged 20 is not focused;

[0094] Wherein, the first output subunit is connected to the second judgment subunit, and is used to output the detection signal according to the second judgment result.

[0095] The fourth threshold value may be obtained according to a test operation and may be pre-written into the storage space of the device to be charged 20 .

[0096] If the fourth judgment result is that the current value is greater than the fourth threshold value, the transmission power of the charging signal has increased sufficiently and does not need to be increased further; otherwise, the transmission power of the charging signal may continue to be increased.

[0097] Combination Figure 7 It can be seen from the structure shown that when the third judgment unit determines that the current value is greater than or equal to the first threshold, the notification unit 227 notifies the wireless charging device not to increase the transmission power of the charging signal. When the third judgment unit determines that the current value is less than the second threshold, the notification unit 227 notifies the wireless charging device to increase the transmission power of the charging signal; after the wireless charging device 10 starts to increase the transmission power of the charging signal, as long as the fourth judgment unit determines that the current value is less than the fourth threshold, the notification unit 227 notifies the wireless charging device 10 to increase the transmission power of the charging signal, until the fourth judgment unit determines that the current value is greater than or equal to the fourth threshold, the notification unit 227 notifies the wireless charging device not to increase the transmission power of the charging signal.

[0098] Through the above analysis, it can be known that the control logic of the transmission power of the wireless charging device 10 is as follows:

[0099] Step B1: when it is determined that the current value is less than the third threshold, notify the wireless charging device 10 to increase the transmission power of the charging signal;

[0100] Step B2: after the transmission power increases, determine whether the current value is greater than a fourth threshold;

[0101] If it is greater than the fourth threshold, execute step B3; otherwise, execute step B4.

[0102] Step B3: notify the wireless charging device 10 not to increase the transmission power of the charging signal any more, and the process ends.

[0103] Step B4: notify the wireless charging device 10 to continue increasing the transmission power of the charging signal, and execute step B2.

[0104] When the third judgment result is that the current value is less than the third threshold, it is judged whether the current value is greater than the preset fourth threshold to control whether to stop increasing the transmission power of the charging signal, thereby reducing the power consumption of the wireless charging device 10 and improving the energy utilization efficiency of the wireless charging device 10.

[0105] Figure 8 for Figure 5 Another schematic diagram of the circuit shown. Figure 8 As shown, the notification unit 227 includes:

[0106] A processing unit C, configured to generate notification information, wherein the notification information is used to notify the wireless charging device whether to increase the transmission power of the charging signal;

[0107] The signal generator S is connected to the transmitting antenna 212 and is used to generate a beacon signal, wherein the beacon signal carries notification information.

[0108] The beacon signal is used to send notification information to control whether the wireless charging device 10 stops increasing the transmission power of the charging signal, which is simple and convenient to implement.

[0109] In an exemplary embodiment, the transmitting antenna 212 and the receiving antenna 211 are the same antenna 21, so that the rectifier 221 and the signal generator S share the same antenna for signal transmission, thereby improving the integration of the circuit.

[0110] Fig. 9 for Figure 5 Another schematic diagram of the circuit shown. Fig. 9 As shown, the circuit also includes:

[0111] The switch device 225 has two first ends and one second end; one first end is connected to the notification unit 227, the other first end is connected to the rectifier 221, and the second end is connected to the antenna, and is used to control any first end and the second end to be in a conductive state.

[0112] Specifically, when a first end and a second end are in a conductive state, the notification unit 227 transmits a beacon signal through the antenna 30 ; when another first end and a second end are in a conductive state, the rectifier 221 receives a charging signal through the antenna 30 .

[0113] Furthermore, the conduction state of the switch device 225 can be controlled externally.

[0114] Specifically, the switch device 28 has a second control terminal, wherein the second control terminal is used to receive a conduction signal, wherein the conduction signal is used to control any one of the first terminal and the second terminal to be in a conduction state.

[0115] The conduction signal may be output by the signal processor 224 .

[0116] Fig.10 This is a schematic diagram of the application of the wireless charging circuit 20 provided in the embodiment of the present application. Fig.10 As shown, the wireless charging circuit 20 includes:

[0117] A rectifier 221, used to convert the radio frequency signal into a direct current signal;

[0118] The power management chip 222 is used to input the input DC signal to the battery, or to step down / boost the input voltage signal and then provide it to the power input terminal of other modules;

[0119] The oscillator 223 is integrated with a signal generator S, which is used to generate a sine wave as a signal source of a beacon signal;

[0120] The signal processor 224 is integrated with a processing unit C, and is used to output a control signal to control various functional modules of the WTP Client; and to generate notification information;

[0121] A switch device 225, used to control the transmission of Beacon signals and the reception of charging signals to share the same antenna;

[0122] The detection unit 226 is used to detect whether the charging signal output by the antenna array is focused on the device to be charged, and output a detection signal.

[0123] by Fig.10 The circuit structure shown is used to perform received power detection as an example for explanation:

[0124] When all array antennas of the WPT source are focused at the WPT Client, the power detected by the WPT Client power detection circuit is P1, corresponding to the first threshold mentioned above; the power upper limit of the WPT Client in the non-focused state is Pmax, corresponding to the second threshold mentioned above.

[0125] Step 101: When the distance between the WPT Client and the WPT Source is far enough, the array antenna power of the WPT Source is focused at the WPT Client. At this time, the power detection circuit of the WPT Client detects the power P2, where P2 = P1. At this time, the transmission power of the WPT Source is not adjusted, and the power transmission is performed in the initial state.

[0126] Step 102: When the position of the WPT Client changes, the distance from the WPT Source is still far enough, and the WPT Source will refocus according to the new position of the WPT Client. At this time, the power detected by the power detection circuit of the WPT Client is still P2, and the transmission power of the WPT Source does not need to be adjusted.

[0127] Step 103: When the WPT Client is close to the WPT Source, the transmission power of the array antenna unit of the WPT Source cannot be focused at the WPT Client because the distance is too close. At this time, the transmission power of the WPT Source detected by the power detection circuit of the WPT Client will be significantly reduced. Assume that the detection power at this time is P3, where P3 is less than P1.

[0128] Step 104: The WPT Client initiates a request to the WPT Source to increase the transmission power.

[0129] Step 105: The WPT Source receives the request from the WPT Client and increases the transmission power of the charging signal.

[0130] Step 106: The receiving power of the charging signal received by the WPT Client increases, and the corresponding charging current increases, wherein the new receiving power is P'.

[0131] If P′ is less than or equal to Pmax, the process continues to loop through steps 104 to 106 . If P′ is greater than or equal to Pmax, the process proceeds to step 107 .

[0132] Step 107: The WPT Client continues charging in the current state and does not output a request for increasing power.

[0133] The WPT Client's detection module is used to control the output power of the WPT Source. When the distance between the WPT Client and the WPT Source is too close, the WPT Client will actively initiate a request to the WPT Source to increase the transmission power, thereby increasing the charging current of the WPT Client and shortening the charging time.

[0134] It will be appreciated by those skilled in the art that all or some of the steps, systems, and functional modules / units in the methods disclosed above may be implemented as software, firmware, hardware, and appropriate combinations thereof. In hardware implementations, the division between the functional modules / units mentioned in the above description does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be performed by several physical components in cooperation. Some or all components may be implemented as software executed by a processor, such as a digital signal processor or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application-specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or non-transitory medium) and a communication medium (or temporary medium). As known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. In addition, it is well known to those of ordinary skill in the art that communication media typically contain computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

Claims

1. A wireless charging circuit, characterized in that: include: A rectifier, connected to the receiving antenna, configured to receive a charging signal output by the antenna array of the wireless charging device through the receiving antenna, and convert the charging signal into a DC signal; A power management chip, connected to the rectifier, for converting the DC signal into electrical energy; A detection unit, used to detect whether the charging signal output by the antenna array is focused on the device to be charged, and output a detection signal; a notification unit, connected to the detection unit, configured to receive a detection signal and notify the wireless charging device whether to increase the transmission power of the charging signal according to the detection signal; Wherein, the detection unit comprises: A first detection subunit, connected to the receiving antenna, for detecting the receiving power of the charging signal when the distance between the wireless charging circuit and the wireless charging device changes; A first judgment subunit, connected to the first detection subunit, is used to judge whether the received power is less than a preset first threshold value, and obtain a first judgment result; wherein the first threshold value is a power value of the charging signal output by the antenna array when the device to be charged achieves focusing; a second judgment subunit, connected to the first judgment subunit, for judging whether the received power is greater than a preset second threshold value when the first judgment result is that the received power is less than the first threshold value, and obtaining a second judgment result; wherein the second threshold value is the maximum power value of the charging signal output by the antenna array when the device to be charged is not focused; wherein, when the transmission power of the charging signal is greater than the second threshold value, as the transmission power of the charging signal continues to increase, the increase amplitude of the received power becomes smaller and smaller; A first output subunit, connected to the second judgment subunit, and configured to output the detection signal according to the second judgment result; Among them, when the second judgment result is that the received power is greater than the second threshold, the detection signal instructs the wireless charging device to stop increasing the transmission power of the charging signal; when the second judgment result is that the received power is less than or equal to the second threshold, the detection signal instructs the wireless charging device to continue to increase the transmission power of the charging signal.

2. The circuit according to claim 1, characterized in that The detection unit comprises: a second detection subunit, connected to the output end of the rectifier, and used to detect the current value of the DC signal; a third judgment subunit, connected to the second detection subunit, for judging whether the current value is less than a preset third threshold value, and obtaining a third judgment result, wherein the third threshold value is a current value of the charging signal output by the antenna array when the charging device is focused; The third output subunit is connected to the third judgment subunit, and is used to output the detection signal according to the third judgment result.

3. The circuit according to claim 2, characterized in that The detection unit comprises: a fourth judgment subunit, connected to the third judgment subunit, for judging whether the current value is less than a preset fourth threshold value, and obtaining a fourth judgment result; wherein the fourth threshold value is a maximum current value of the charging signal output by the antenna array when the device to be charged is not focused; The third output subunit is connected to the fourth judgment subunit, and is used to output the detection signal according to the fourth judgment result.

4. The circuit according to claim 1, characterized in that The notification unit comprises: a processing unit, configured to generate notification information, wherein the notification information is used to notify the wireless charging device whether to increase the transmission power of the charging signal; The signal generator is connected to the transmitting antenna and is used to generate a beacon signal, wherein the beacon signal carries notification information.

5. The circuit according to claim 4, characterized in that The transmitting antenna and the receiving antenna are the same antenna.

6. The circuit according to claim 5, characterized in that The circuit further comprises: A switch device, wherein the switch device has two first ends and one second end; one first end is connected to the notification unit, the other first end is connected to the rectifier, and the second end is connected to the antenna, and is used to control any first end and the second end to be in a conductive state.

7. A device to be charged, characterized in that: The method comprises a circuit as claimed in any one of claims 1 to 6.

8. A wireless charging system, characterized in that: It comprises the device to be charged and the wireless charging apparatus as described in claim 7.

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