CN115425776A

CN115425776A - Wireless charging circuit and system and to-be-charged device

Info

Publication number: CN115425776A
Application number: CN202211175771.5A
Authority: CN
Inventors: 彭博
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2022-09-26
Filing date: 2022-09-26
Publication date: 2022-12-02

Abstract

The embodiment of the application discloses a wireless charging circuit, a wireless charging system and a device to be charged. The circuit comprises: the rectifier is connected with the receiving antenna and used for receiving a charging signal output by an antenna array of the wireless charging device through the receiving antenna and converting the charging signal into a direct current signal; the power management chip is connected with the rectifier and used for converting the direct current signal into electric energy; the detection unit is used for detecting whether the charging signals output by the antenna array realize focusing on the equipment to be charged or not and outputting detection signals; and the notification unit is connected with the detection unit and used for receiving the detection signal and notifying the wireless charging device whether to increase the transmitting power of the charging signal or not according to the detection signal.

Description

Wireless charging circuit and system and to-be-charged device

Technical Field

The embodiment of the application relates to the field of wireless power transmission, and in particular relates to a wireless charging circuit, a wireless charging system and a device to be charged.

Background

At present, the wireless charging technology is widely applied to products such as mobile phones, watches, wristbands, bluetooth headsets and even electric automobiles. The wireless charging technology can be divided into a low-power wireless charging mode and a high-power wireless charging mode. The low-power wireless charging is usually in an electromagnetic induction type, for example, a mobile phone is charged; high-power wireless charging is usually performed in a resonant mode, for example, charging an electric vehicle. Because the charger and the electric device are connected by the magnetic field transmission capacity without wires, the electric device can be charged more conveniently, and the appearance design of the electric device is more beautiful.

Due to the convenience of wireless charging and the popularization of intelligent device usage, how to charge intelligent devices more efficiently is an urgent problem to be solved.

Disclosure of Invention

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

In order to achieve the purpose of the embodiments of the present application, an embodiment of the present application provides a wireless charging circuit, including:

the rectifier is connected with the receiving antenna and used for receiving a charging signal output by an antenna array of the wireless charging device through the receiving antenna and converting the charging signal into a direct current signal;

the power management chip is connected with the rectifier and used for converting the direct current signal into electric energy;

the detection unit is used for detecting whether the charging signals output by the antenna array realize focusing on the equipment to be charged or not and outputting detection signals;

and the notification unit is connected with the detection unit and used for receiving the detection signal and notifying the wireless charging device whether to increase the transmitting power of the charging signal or not according to the detection signal.

A device to be charged comprising the circuit described above.

A wireless charging system comprises the device to be charged and the wireless charging device.

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

whether the wireless charging device is informed to increase the transmitting power of the charging signal is determined by detecting whether the charging signal output by the antenna array is focused on the equipment to be charged or not, so that the energy deficiency caused by the unfocused charging signal is compensated, the charging efficiency of the equipment to be charged is improved, and the wireless charging duration is shortened.

Additional features and advantages of the embodiments of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the embodiments of the application. The objectives and other advantages of the embodiments of the application may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

The accompanying drawings are included to provide a further understanding of the embodiments of the present application and are incorporated in and constitute a part of this specification, illustrate embodiments of the present application and together with the examples of the embodiments of the present application do not constitute a limitation of the embodiments of the present application.

FIG. 1 (a) is a schematic diagram of a beacon signal path;

FIG. 1 (b) is a schematic path diagram of a charging signal;

fig. 2 is a schematic diagram of the wireless charging system 100;

fig. 3 is a schematic circuit diagram of the device to be charged 20 in the system shown in fig. 2;

fig. 4 (a) is a schematic diagram of the rf transmission path of the charging signal at time t 1;

fig. 4 (b) is a schematic diagram of the rf transmission path of the charging signal at time t 2;

fig. 5 is a schematic diagram of a wireless charging circuit according to an embodiment of the present disclosure;

FIG. 6 is a schematic diagram of the detecting unit 226 in the circuit shown in FIG. 5;

FIG. 7 is another schematic diagram of the detection unit 226 in the circuit shown in FIG. 5;

FIG. 8 is another schematic diagram of the circuit of FIG. 5;

FIG. 9 is a schematic diagram of yet another configuration of the circuit of FIG. 5;

fig. 10 is a schematic application diagram of the wireless charging circuit 22 according to the embodiment of the present disclosure.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application more apparent, the embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be noted that, in the embodiments of the present application, features in the embodiments and the examples may be arbitrarily combined with each other without conflict.

Wireless Power Transfer (WPT) converts radio frequency Power into direct current through a rectifier, and then charges a battery or directly supplies Power to components of electronic equipment.

The WPT system includes: a WPT Source terminal (Source) as a Power Provider (Power Provider) for providing radio frequency Power; and a WPT Client (Client) as a Power provider (Power Receiver) for receiving the radio frequency Power.

The WPT Client is internally provided with an antenna for charging, and transmits a Beacon (Beacon) signal in an omnidirectional way through the antenna, wherein a part of the signal reaches the WPT Source after being directly transmitted or reflected, and the path of the signal is shown in figure 1 (a).

And 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 reversely transmitted according to the path of the transmitting signal of the WPT Client, namely the path shown in (b) of FIG. 1. The transmitted signal energy of the WPT Source is focused on the antenna of the WPT Client after being directly radiated/reflected, so that the purpose that the transmitted energy is concentrated on the WPT Client is achieved. Wherein, the higher the energy concentration degree at the antenna of the WPT Client, the higher the emission efficiency of the WPT Source.

Since the parameters of the transmitted signal of the WPT Source are partially derived from the beacon signal of the WPT Client, the parameters change with the change of the characteristics of the received beacon signal, for example, if the position of the WPT Client moves, the WPT Source updates the parameters of the transmitted signal, so that the charging signal of the WPT Source is focused again at the new position of the WPT Client.

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

Fig. 2 is a schematic diagram of the wireless charging system 100. As shown in fig. 2, the wireless charging system 100 includes a wireless charging apparatus 10 and a device to be charged 20, wherein:

the wireless charging device 10 comprises a first charging module and a beacon receiving module; wherein:

the first charging module is used for converting the current into a charging signal and outputting the charging signal in a radio frequency signal mode;

and the beacon receiving module is used for receiving a beacon signal transmitted by the equipment to be charged in an omnidirectional manner.

The device to be charged 20 comprises a second charging module and a beacon transmitting module; wherein:

the second charging module is used for converting the charging signal received by the antenna into direct current;

and the beacon transmitting module is used for transmitting the beacon signal in an omnidirectional manner by using the current charging antenna.

Fig. 3 is a schematic circuit diagram of the device to be charged 20 in the system shown in fig. 2. As shown in fig. 3, the device to be charged 20 includes an antenna 21, a wireless charging circuit 22, and a battery 23; wherein:

an antenna 21 for transmitting a Beacon signal and receiving a charging signal;

and the wireless charging circuit 22 is used for performing wireless charging by using the charging signal and instructing the wireless charging device 10 to adjust the transmitting power of the charging signal through the Beacon signal.

And a battery 23 connected to the wireless charging circuit 22 for storing electric energy.

Further, the wireless charging circuit 22 includes:

a rectifier 221 for converting the radio frequency signal into a direct current signal;

a power management chip 222, configured to input an input dc signal to the battery, or step down/step up an input voltage signal and then supply the stepped-down/stepped-up voltage signal to a power input terminal of another module;

an oscillator 223 for generating a sine wave as a signal source of a Beacon (Beacon) signal;

and the signal processor 224 is used for outputting a control signal to control each functional module of the WTP Client.

And a switching device 225 for realizing that the same antenna is shared by the Beacon signal transmission and the charging signal reception.

At the time t1, the WPT Client is far enough from the WPT Source, the charging signal output by the antenna array of the WPT Source can be focused at the WPT Client, and a radio frequency transmission path is shown in fig. 4 (a); at the time t2, the distance between the WPT Client and the WPT Source is very close, the charging signal output by the antenna array of the WPT Source cannot be focused at the WPT Client, and the radio frequency transmission path is as shown in fig. 4 (b).

As can be seen from the rf transmission paths shown in fig. 4 (a) and 4 (b), when the WPT Client is very close to the WPT Source, the WPT Client is only within a partial coverage area of the antenna array of the WPT Source, because the energy of the charging signal transmitted by the antenna array cannot be focused at the WPT Client, the energy received by the charging antenna of the WPT Client is reduced, the charging current is reduced, and the charging time is increased.

Based on the above technical problem, the embodiments of the present application provide the following solutions:

fig. 5 is a schematic diagram of a wireless charging circuit 22 according to an embodiment of the present disclosure. As shown in fig. 5, the wireless charging circuit 22 includes a rectifier 221, a power management chip 222, a detection unit 226, and a notification unit 227; wherein:

the rectifier 221 is connected to the receiving antenna 211, and is configured to receive a charging signal output by an antenna array of the wireless charging device 10 through the receiving antenna 211, and convert the charging signal into a direct current signal;

a power management chip 222, connected to the rectifier 221, for converting the dc signal into electric energy; the power management chip 222 may store the converted electric energy in a battery or directly provide the electric energy to a power utilization module in the device to be charged 20; the power utilization module can be a processor, a camera module or a communication module (such as a WIFI module, a Bluetooth module and the like).

A detecting unit 226, configured 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;

specifically, if the charging signal can be focused on the device to be charged 20, it indicates that the energy of the charging signal received by the receiving antenna 221 is sufficient, and the charging efficiency is better without increasing the transmission power of the charging signal; otherwise, it indicates that the energy of the charging signal received by the receiving antenna 221 is insufficient and the charging efficiency is to be improved, the transmitting power of the charging signal needs to be increased.

A notification unit 227, connected to the detection unit 226, for receiving the detection signal and notifying the wireless charging device 10 whether to increase the transmission power of the charging signal according to the detection signal.

Specifically, if the charging signal does not achieve focusing on the device to be charged 20, the energy of the charging signal currently received by the receiving antenna 211 needs to be further increased, and therefore, the wireless charging apparatus 10 needs to be informed to increase the transmitting power of the charging signal to compensate for the energy shortage caused by the unfocused charging signal.

The circuit provided by the embodiment of the application determines whether to notify the wireless charging device 10 to increase the transmitting 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 or not, so as to compensate for insufficient energy caused by unfocused charging signal, improve the charging efficiency of the device to be charged 20, and shorten the wireless charging time.

The following describes a circuit provided in an embodiment of the present application:

fig. 6 is a schematic structural diagram of the detecting unit 226 in the circuit shown in fig. 5. As shown in fig. 6, the detecting unit 226 includes a first detecting subunit, a first judging subunit and a first outputting subunit connected in sequence, where the first detecting subunit is connected to the receiving antenna 231. The operation executed by the functional unit is as follows:

the first detection unit receives a charging signal from the receiving antenna 231 and detects the received power of the charging signal. And providing judgment data for judging whether the charging signals output by the antenna array realize focusing on the equipment to be charged or not by detecting the power of the received charging signals.

The first judging subunit judges whether the receiving power is smaller than a preset first threshold value or not to obtain a first judging result; the first threshold is a power value of the charging signal output by the antenna array when the device to be charged 20 realizes focusing;

specifically, the first threshold may be obtained according to a test operation, and is written into the storage space of the device to be charged 20 in advance;

if the first judgment result is that the received power is smaller than the first threshold, it indicates that the charging signal output by the antenna array is not focused on the device to be charged 20; otherwise, it indicates that the charging signal output by the antenna array achieves focusing at the device to be charged 20.

And the first output subunit outputs the detection signal according to the first judgment result.

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 according to the received power of the charging signal, so that whether the charging signal is focused on the device to be charged 20 can be quickly determined, and the determination efficiency is improved.

The charging signal is unfocused at the device to be charged 20 because the distance of the device to be charged 20 relative to the wireless charging apparatus 10 is too close. Changing the charging signal from the non-focused state to the focused state on the device to be charged 20 is generally not possible if the position of the device to be charged does not change, or the relative distance does not change. Since the received power of the charging signal cannot reach the first threshold even if the transmission power of the charging signal is increased sufficiently, and the power of the received charging signal can be increased with an increasing transmission power, the power consumption of the wireless charging device 10 is increased and the energy utilization efficiency of the wireless charging device 10 is reduced if the increase of the transmission power of the charging signal is not limited.

Based on the above analysis, in an exemplary embodiment, the detecting unit 226 further includes a second determining subunit connected to the first determining subunit.

Specifically, when the first determination result is that the received power is smaller than the first threshold, determining whether the received power is greater than a preset second threshold to obtain a second determination result; wherein the second threshold is a maximum power value of the charging signal output by the antenna array when the device to be charged 20 is not focused.

The first output subunit is connected to the second determining subunit, and configured to output the detection signal according to the second determination result.

In the above embodiment, the second threshold may be obtained according to a test operation and written into the storage space of the device to be charged 20 in advance.

If the second judgment result is that the received power is greater than the second threshold, the transmitting power of the charging signal is increased sufficiently without being increased continuously; otherwise, the transmission power of the charging signal can be increased continuously.

As can be seen from the structure shown in fig. 6, when the first determining unit determines that the received power is greater than or equal to the first threshold, the notifying unit 227 notifies the wireless charging device not to increase the transmission power of the charging signal. When the first determination unit determines that the received power is smaller 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 determination unit determines that the received power is smaller 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 determination unit determines that the received power is greater than or equal to the second threshold, and the notification unit 227 notifies the wireless charging device not to increase the transmission power of the charging signal.

As can be seen from the above analysis, the control logic for the transmission power of the wireless charging device 10 is as follows:

step A1, when judging that the receiving power is smaller than a first threshold value, informing the wireless charging device 10 to increase the transmitting power of a charging signal;

step A2, after the transmitting power is increased, judging whether the receiving power of the charging signal is greater than a second threshold value;

if the threshold value is larger than the second threshold value, executing the step A3; otherwise, step A4 is performed.

And step A3, informing the wireless charging device 10 that the transmitting power of the charging signal is not increased any more, and ending the process.

Step A4, notifying the wireless charging device 10 to continue to increase the transmission power of the charging signal, and executing step A2.

In the above embodiment, when the first determination result is that the received power is smaller than the first threshold, it is determined whether the received power is greater than a preset second threshold, so as 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.

Fig. 7 is another schematic diagram of the detection unit 226 in the circuit shown in fig. 5. As shown in fig. 7, the detection unit includes a second detection subunit, a third judgment subunit and a third output subunit, which are connected in sequence, where the second detection subunit is connected to the output end of the rectifier. The operation executed by the functional unit is as follows:

the first detection unit receives a dc signal from the rectifier 221 and detects a current value of the dc signal; and by detecting the current value of the received direct current signal, judging data is provided for judging whether the charging signal output by the antenna array realizes focusing on the equipment to be charged.

The third judging subunit judges whether the current value is smaller than a preset third threshold value to obtain a third judging result, wherein the third threshold value is the current value of the charging signal output by the antenna array when the device to be charged realizes focusing;

specifically, the third threshold may be obtained according to a test operation, and is written into the storage space of the device to be charged 20 in advance;

if the third determination result is that the received power is smaller than the third threshold, it indicates that the charging signal output by the antenna array is not focused on the device to be charged 20; otherwise, the charging signal output by the antenna array is focused on the device to be charged 20.

And the third output subunit is connected with the third judging subunit and used for outputting the detection signal according to the third judging result.

In the above embodiment, the rectifier 221 receives the dc signal, and determines whether the charging signal output by the antenna array is focused on the device to be charged 20 according to the current value of the dc signal, so as to quickly determine whether the charging signal is focused on the device to be charged 20, thereby improving the determination efficiency.

The charging signal is unfocused at the device to be charged 20 because the distance of the device to be charged 20 with respect to the wireless charging apparatus 10 is too close. Changing the charging signal from the non-focused state to the focused state on the device to be charged 20 is generally not possible if the position of the device to be charged does not change, or the relative distance does not change. Since the received power of the charging signal cannot reach the first threshold even if the transmission power of the charging signal is increased to be sufficiently large, and the increase of the received power is smaller and smaller as the transmission power is increased, if the increase of the transmission power of the charging signal is not limited, the power consumption of the wireless charging apparatus 10 is increased, and the energy utilization efficiency of the wireless charging apparatus 10 is reduced.

Based on the above analysis, in an exemplary embodiment, the detecting unit 226 further includes a second determining subunit, where the second determining subunit is connected to the first determining subunit, and is configured to determine whether the current value is smaller than a preset fourth threshold value, so as to obtain a fourth determination result; the fourth threshold is a maximum current value of the charging signal output by the antenna array when the device to be charged 20 is not focused;

the first output subunit is connected to the second judging subunit, and configured to output the detection signal according to the second judgment result.

The fourth threshold may be obtained according to a test operation, and is written into the storage space of the device to be charged 20 in advance.

If the fourth judgment result is that the current value is greater than the fourth threshold value, the transmitting power of the charging signal is increased enough and does not need to be increased continuously; otherwise, the transmission power of the charging signal can be increased continuously.

As can be seen from the structure shown in fig. 7, when the third determination 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 determination unit determines that the current value is smaller 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 judging unit judges that the current value is smaller than the fourth threshold value, the notifying unit 227 notifies the wireless charging device 10 to increase the transmission power of the charging signal, and until the fourth judging unit judges that the current value is larger than or equal to the fourth threshold value, the notifying unit 227 notifies the wireless charging device not to increase the transmission power of the charging signal.

step B1, when the current value is judged to be smaller than the third threshold value, informing the wireless charging device 10 to increase the transmitting power of the charging signal;

step B2, after the transmitting power is increased, judging whether the current value is greater than a fourth threshold value;

if the second threshold value is larger than the fourth threshold value, executing the step B3; otherwise, step B4 is performed.

And step B3, informing the wireless charging device 10 not to increase the transmitting power of the charging signal any more, and ending the process.

And step B4, informing the wireless charging device 10 to continuously increase the transmitting power of the charging signal, and executing the step B2.

And when the third judgment result is that the current value is smaller than the third threshold, judging whether the current value is larger than a preset fourth threshold to control whether to stop increasing the transmitting power of the charging signal, so that the power consumption of the wireless charging device 10 is reduced, and the energy utilization efficiency of the wireless charging device 10 is improved.

Fig. 8 is another schematic diagram of the circuit shown in fig. 5. As shown in fig. 8, the notification unit 227 includes:

a processing unit C configured to generate notification information, where the notification information is used to notify the wireless charging apparatus whether to increase the transmission power of the charging signal;

a signal generator S is connected to the transmitting antenna 212 for generating a beacon signal, wherein the beacon signal carries notification information.

The beacon signal is used for sending the notification information to control whether the wireless charging device 10 stops increasing the transmitting power of the charging signal, and the method is simple and convenient to implement.

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, providing circuit integration.

Fig. 9 is yet another schematic diagram of the circuit of fig. 5. As shown in fig. 9, the circuit further includes:

a switching device 225 having two first terminals and a second terminal; one of the first terminals is connected to the notification unit 227, the other first terminal is connected to the rectifier 221, and the second terminal is connected to the antenna, so as to control any one of the first terminals and the second terminal to be in a conducting state.

Specifically, when a first terminal and a second terminal are in a conducting state, the notification unit 227 transmits a beacon signal through the antenna 30; when the other first terminal and the second terminal are in a conducting state, the rectifier 221 receives a charging signal through the antenna 30.

Further, the on state of the switching device 225 may be controlled from the outside.

Specifically, the switching device 28 has a second control terminal, wherein the second control terminal is configured to receive a conducting signal, and wherein the conducting signal is configured to control any one of the first terminal and the second terminal to be in a conducting state.

The on signal may be output by the signal processor 224.

Fig. 10 is a schematic application diagram of a wireless charging circuit 20 according to an embodiment of the present disclosure. As shown in fig. 10, the wireless charging circuit 20 includes:

an oscillator 223 integrated with a signal generator S for generating a sine wave as a signal source of a Beacon (Beacon) signal;

a signal processor 224 integrated with the processing unit C, configured to output a control signal and control each functional module of the WTP Client; and generating notification information;

a switching device 225 for controlling the same antenna for the transmission of the Beacon signal and the reception of the charging signal;

the detecting unit 226 is configured to detect whether the charging signal output by the antenna array is focused on the device to be charged, and output a detection signal.

The following description will be given by taking the circuit configuration shown in fig. 10 as an example to perform reception power detection:

when all array antennas of the WPT source realize focusing at the WPT Client, the power detected by the WPT Client power detection circuit is P1 and corresponds to the first threshold; the upper power limit of the WPT Client in the non-focusing state is Pmax, which corresponds to the second threshold value above.

Step 101, when the distance between the WPT Client and the WPT Source is far enough, the power of the array antenna of the WPT Source is focused at the WPT Client, the power P2 detected by a power detection circuit of the WPT Client at the moment is P2, wherein P2= P1, the transmitting power of the WPT Source is not adjusted at the moment, and power transmission is carried out in an initial state.

And 102, when the position of the WPT Client is changed, the distance from the WPT Source is still far enough, the WPT Source refocuses at a new position according to the WPT Client, the power detected by the power detection circuit of the WPT Client is still P2, and the transmitting power of the WPT Source does not need to be adjusted.

And 103, when the position of the WPT Client is close to the WPT Source, the transmitting 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, and the detection power at this time is assumed to be P3, where P3 is smaller than P1.

And 104, the WPT Client initiates a request for increasing the transmission power to the WPT Source.

And 105, the WPT Source receives the WPT Client request and increases the transmitting power of the charging signal.

Step 106, the receiving power of the charging signal received by the WPT Client is increased, and the corresponding charging current is increased, wherein the new receiving power is P'.

If P 'is less than or equal to Pmax, the loop continues from step 104 to step 106, if P' is greater than or equal to Pmax, the loop proceeds to step 107.

And step 107, the WPT Client continues to charge in the current state, and does not output a request for power increase.

The WPT Source output power control function is achieved through the WPT Client detection module, when the distance between the WPT Client and the WPT Source is too close, the WPT Client actively initiates a request to request the WPT Source to increase the transmitting power, the charging current of the WPT Client is increased, and the charging time is shortened.

It will be understood by those of ordinary skill in the art that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software, firmware, hardware, or suitable combinations thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed by several physical components in cooperation. Some or all of the components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is 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 tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies 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 includes any information delivery media as is well known to those skilled in the art.

Claims

1. A wireless charging circuit, comprising:

2. The circuit of claim 1, wherein the detection unit comprises:

the first detection subunit is connected with the receiving antenna and used for detecting the receiving power of the charging signal;

the first judging subunit is connected with the first detecting subunit and used for judging whether the receiving power is smaller than a preset first threshold value or not to obtain a first judging result; the first threshold value is a power value of a charging signal output by the antenna array when the equipment to be charged realizes focusing;

and the first output subunit is connected with the first judgment subunit and is used for outputting the detection signal according to the first judgment result.

3. The circuit of claim 2, wherein the detection unit further comprises:

the second judging subunit is connected to the first judging subunit, and configured to, when the first judging result is that the received power is smaller than the first threshold, judge whether the received power is greater than a preset second threshold, and obtain a second judging result; the second threshold is the maximum power value of the charging signal output by the antenna array when the device to be charged is not focused;

and the first output subunit is connected with the second judgment subunit and is used for outputting the detection signal according to the second judgment result.

4. The circuit of claim 1, wherein the detection unit comprises:

the second detection subunit is connected with the output end of the rectifier and is used for detecting the current value of the direct current signal;

the third judging subunit is connected to the second detecting subunit and configured to judge whether the current value is smaller than a preset third threshold value, so as to obtain a third judgment result, where the third threshold value is a current value of a charging signal output by the antenna array when the device to be charged is focused;

and the third output subunit is connected with the third judgment subunit and is used for outputting the detection signal according to the third judgment result.

5. The circuit of claim 4, wherein the detection unit comprises:

the fourth judging subunit is connected with the third judging unit and used for judging whether the current value is smaller than a preset fourth threshold value or not to obtain a fourth judging result; the fourth threshold is the maximum current value of the charging signal output by the antenna array when the device to be charged is not focused;

and the third output subunit is connected with the fourth judging subunit and is used for outputting the detection signal according to the fourth judging result.

6. The circuit of claim 1, wherein the notification unit comprises:

a processing unit configured to generate notification information, where the notification information is used to notify the wireless charging apparatus whether to increase the transmission power of the charging signal;

and the signal generator is connected with the transmitting antenna and used for generating a beacon signal, wherein the beacon signal carries notification information.

7. The circuit of claim 6, wherein the transmit antenna and the receive antenna are the same antenna.

8. The circuit of claim 7, further comprising:

a switching device having two first terminals and a second terminal; one first end is connected with the notification unit, the other first end is connected with the rectifier, and the second end is connected with the antenna and used for controlling any one of the first end and the second end to be in a conducting state.

9. A device to be charged, comprising a circuit as claimed in any one of claims 1 to 8.

10. A wireless charging system, comprising the apparatus to be charged according to claim 9 and a wireless charging device.