WO2021013258A1

WO2021013258A1 - Device to be charged, wireless charging method and system

Info

Publication number: WO2021013258A1
Application number: PCT/CN2020/104606
Authority: WO
Inventors: 林尚波; 万世铭; 杨军
Original assignee: Oppo广东移动通信有限公司
Priority date: 2019-07-25
Filing date: 2020-07-24
Publication date: 2021-01-28
Also published as: CN112290652A; CN112290652B

Abstract

Disclosed in the present disclosure are a device to be charged, a wireless charging method and a system. The device to be charged comprises: a battery; a wireless receiving circuit, used to receive an electromagnetic signal emitted by a wireless charging apparatus, and convert the electromagnetic signal into output current, so as to charge the battery; and a control module, electrically connected to the wireless receiving circuit, and used to determine whether the battery has fulfilled a pre-determined charging stop condition according to acquired battery information; when the battery fulfills the charging stop condition, stopping charging of the battery; the charging stop condition comprising at least one of the following conditions: an amount of power of the battery having reached a pre-determined stopping amount of power, a voltage of the battery being greater than a pre-determined stopping voltage, and a charging current of the battery being less than a pre-determined stopping current; the stopping voltage and the stopping current both being determined according to a temperature and a current wireless charging mode of the battery.

Description

Device to be charged, wireless charging method and system

Technical field

The present disclosure relates to the field of wireless charging technology, and in particular to a device to be charged, a wireless charging method and system.

Background technique

With the popularization of wireless charging technology, more and more electronic devices support wireless charging or wireless transmission functions. At present, usually only the cut-off voltage of the battery is used as the cut-off condition for battery charging, and when setting the cut-off voltage of charging, the influence of the temperature of the battery and the current charging mode on the charge cut-off voltage is not considered. In order to prevent the battery from being overcharged, the cut-off voltage is usually set to be lower, which may cause the battery to be unable to be fully charged in some cases, resulting in low battery power utilization.

The above-mentioned information disclosed in the background section is only used to enhance the understanding of the background of the present disclosure, so it may include information that does not constitute the prior art known to those of ordinary skill in the art.

Summary of the invention

In view of this, the present disclosure provides a device to be charged, a wireless charging method and system.

Other characteristics and advantages of the present disclosure will become apparent through the following detailed description, or partly learned through the practice of the present disclosure.

According to an aspect of the present disclosure, there is provided a device to be charged, including: a battery; a wireless receiving circuit for receiving an electromagnetic signal emitted by a wireless charging device, and converting the electromagnetic signal into an output current to charge the battery; And a control module, electrically connected to the wireless receiving circuit, for judging whether the battery satisfies a preset charging cut-off condition according to the acquired information of the battery; when the battery satisfies the charging cut-off condition, cut off The charging of the battery; wherein the charging cut-off condition includes at least one of the following conditions: the power of the battery reaches a preset cut-off power, the voltage of the battery is greater than the preset cut-off voltage, and the battery The charging current is less than a preset cut-off current; wherein the cut-off voltage and the cut-off current are both determined according to the battery temperature and the current wireless charging mode; wherein, the wireless charging mode includes: first wireless charging And the second wireless charging mode, the output power of the wireless charging device in the first wireless charging mode is greater than the output power in the second wireless charging mode.

According to an embodiment of the present disclosure, the control module is used to determine whether the power of the battery reaches the cut-off power, whether the voltage of the battery is greater than the cut-off voltage, and whether the charging current of the battery is less than the cut-off Current; when the power of the battery reaches the cut-off power, the voltage of the battery is greater than the cut-off voltage, and the charging current of the battery is less than the cut-off current, it is determined that the battery meets the charge cut-off condition, and the cut-off Charging the battery.

According to an embodiment of the present disclosure, the control module is further configured to, when receiving the first indication signal sent by the wireless receiving circuit, periodically start the wireless charging process according to a preset cycle time; and in the wireless charging In the process, according to the preset cycle time and periodically according to the acquired information of the battery, it is determined whether the battery satisfies the charge cut-off condition.

According to an embodiment of the present disclosure, the control module is further configured to determine whether the difference between the cut-off voltage and the voltage of the battery is greater than a preset value after the charging of the battery is cut off in the wireless charging process When the difference between the cut-off voltage and the voltage of the battery is greater than the recharge threshold, restart the charging of the battery.

According to an embodiment of the present disclosure, the control module is further configured to exit the wireless charging process when receiving a second instruction signal sent by the wireless receiving circuit.

According to an embodiment of the present disclosure, the device to be charged further includes: a voltage conversion module connected to the control module and the battery; wherein the control module is used to control the voltage conversion module so that the The voltage conversion module stops outputting the charging voltage and charging current to the battery.

According to an embodiment of the present disclosure, the device to be charged further includes: a current detection circuit, respectively connected to the control module and the voltage conversion circuit, and configured to charge the battery charging current output by the voltage conversion module Take measurements.

According to an embodiment of the present disclosure, when the battery includes a plurality of battery cells connected in series, the battery meeting the charge cut-off condition includes: when it is determined that one of the plurality of battery cells meets the charge cut-off condition When the battery meets the charging cut-off condition.

According to an embodiment of the present disclosure, the device to be charged further includes: a charging interface and a switching module in charge, the load switching module is respectively connected to the charging interface and the control module, and the load switching module is used for switching control The battery is powered by the wireless receiving circuit or by the charging interface.

According to an embodiment of the present disclosure, the cut-off power is expressed as a percentage of the power when the battery is fully charged.

According to another aspect of the present disclosure, there is provided a wireless charging method applied to a device to be charged, including: judging whether the battery satisfies a preset charging cut-off condition according to acquired information of the battery in the device to be charged; and When the battery satisfies the charge cut-off condition, the charging of the battery is cut off; wherein, the charge cut-off condition includes at least one of the following conditions: the power of the battery reaches a preset cut-off power, The voltage of the battery is greater than the preset cut-off voltage, and the charging current of the battery is less than the preset cut-off current; wherein the cut-off voltage and the cut-off current are both determined according to the temperature of the battery and the current wireless charging mode Wherein, the wireless charging mode includes: a first wireless charging mode and a second wireless charging mode, and the output power of the wireless charging device for wireless charging of the device to be charged in the first wireless charging mode is greater than The output power in the second wireless charging mode.

According to an embodiment of the present disclosure, judging whether the battery satisfies a preset charging cut-off condition based on the acquired information of the battery in the device to be charged includes: judging whether the power of the battery reaches the cut-off power, the Whether the voltage of the battery is greater than the cut-off voltage and the charging current of the battery is less than the cut-off current; and when the power of the battery reaches the cut-off power, the voltage of the battery is greater than the cut-off voltage and the battery When the charging current of is less than the cut-off current, it is determined that the battery meets the charging cut-off condition.

According to an embodiment of the present disclosure, before determining whether the battery satisfies the charge cut-off condition determined according to the preset cut-off power, cut-off voltage, and cut-off current, the method further includes: when the wireless receiving circuit sends the In the case of the first indication signal, periodically start the wireless charging process according to the preset cycle time; according to the acquired information of the battery in the device to be charged, determining whether the battery meets the preset charging cut-off condition includes: In the charging process, according to the preset cycle time and periodically according to the acquired information of the battery, it is determined whether the battery meets the charging cut-off condition.

According to an embodiment of the present disclosure, the method further includes: in the wireless charging process, after the battery is cut off, determining whether the difference between the cut-off voltage and the voltage of the battery is greater than a preset Recharge threshold; when the difference between the cut-off voltage and the voltage of the battery is greater than the recharge threshold, restart the charging of the battery.

According to an embodiment of the present disclosure, the method further includes: exiting the wireless charging process when the second indication signal sent by the wireless receiving circuit is received.

According to an embodiment of the present disclosure, cutting off the charging of the battery includes: controlling a voltage conversion module in the device to be charged so that the voltage conversion module stops outputting a charging voltage and a charging current to the battery.

According to an embodiment of the present disclosure, before determining whether the battery satisfies a preset charging cut-off condition according to the acquired information of the battery in the device to be charged, the method further includes: controlling the battery in the device to be charged The current detection module measures the charging current of the battery output by the voltage conversion module.

According to another aspect of the present disclosure, there is provided a wireless charging system, including: according to any of the above-mentioned equipment to be charged, a wireless charging device, and a power supply device; wherein, the wireless charging device is used to convert input electric energy into electromagnetic The signal is transmitted to perform wireless charging for the device to be charged; the power supply device is used to provide the input power for the wireless charging device.

According to the device to be charged provided by the embodiments of the present disclosure, when determining the battery charging cut-off condition, it is not only judged based on the battery voltage, but also needs to consider whether the battery power reaches the preset cut-off power and whether the charging current meets the current cut-off condition , Which can provide more accurate judgment results. In addition, the cut-off voltage and cut-off current of the battery are set to different values according to different temperature ranges and different wireless charging modes, which can further improve the utilization efficiency of battery power.

It should be understood that the above general description and the following detailed description are only exemplary and cannot limit the present disclosure.

Description of the drawings

By describing its exemplary embodiments in detail with reference to the accompanying drawings, the above and other objectives, features, and advantages of the present disclosure will become more apparent.

Fig. 1 is a block diagram showing a device to be charged according to an exemplary embodiment.

Fig. 2 is a schematic structural diagram of a wireless charging system according to an exemplary embodiment.

Fig. 3 is a block diagram showing another device to be charged according to an exemplary embodiment.

Fig. 4 is a flow chart showing a wireless charging method according to an exemplary embodiment.

Fig. 5 is a flow chart showing another wireless charging method according to an exemplary embodiment.

Fig. 6 is a flow chart showing still another wireless charging method according to an exemplary embodiment.

Detailed ways

Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms, and should not be construed as being limited to the examples set forth herein; on the contrary, the provision of these embodiments makes the present disclosure more comprehensive and complete, and fully conveys the concept of the example embodiments To those skilled in the art. The drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the figures denote the same or similar parts, and thus their repeated description will be omitted.

Furthermore, the described features, structures or characteristics can be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to give a sufficient understanding of the embodiments of the present disclosure. However, those skilled in the art will realize that the technical solutions of the present disclosure can be practiced without one or more of the specific details, or other methods, components, devices, steps, etc. can be used. In other cases, well-known structures, methods, devices, implementations, materials, or operations are not shown or described in detail to avoid overwhelming people and obscure all aspects of the present disclosure.

In the present disclosure, unless otherwise clearly defined and defined, the terms "connected", "connected" and other terms should be understood in a broad sense. For example, they may be fixedly connected, detachably connected, or integrated; they may be electrical The connection can also be a communication connection; it can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meaning of the above-mentioned terms in the present disclosure can be understood according to specific circumstances.

In the process of wireless charging, a power supply device (such as an adapter) is generally connected to a wireless charging device (such as a wireless charging base), and the output power of the power supply device is wirelessly (such as electromagnetic signals or electromagnetic waves) through the wireless charging device. Transfer to the device to be charged, and wirelessly charge the device to be charged.

According to different principles of wireless charging, wireless charging methods are mainly divided into three methods: magnetic coupling (or electromagnetic induction), magnetic resonance, and radio waves. At present, mainstream wireless charging standards include QI standard, Power Matters Alliance (PMA) standard, and Wireless Power Alliance (Alliance for Wireless Power, A4WP). Both the QI standard and the PMA standard use magnetic coupling for wireless charging. The A4WP standard uses magnetic resonance for wireless charging.

The device 10 to be charged as shown in FIG. 1 may be, for example, a terminal or a communication terminal. The terminal or communication terminal includes but is not limited to being set to be connected via a wired line, such as via a public switched telephone network (PSTN), Digital subscriber line (DSL), digital cable, direct cable connection, and/or another data connection/network and/or via, for example, cellular network, wireless local area network (WLAN), such as handheld Digital video broadcasting (digital video broadcasting handheld, DVB-H) network digital TV network, satellite network, amplitude modulation-frequency modulation (AM-FM) broadcast transmitter, and/or wireless interface of another communication terminal A device for receiving/sending communication signals. A communication terminal set to communicate through a wireless interface may be referred to as a "wireless communication terminal", a "wireless terminal" and/or a "mobile terminal". Examples of mobile terminals include, but are not limited to, satellite or cellular phones; personal communication system (PCS) terminals that can combine cellular radio phones with data processing, fax, and data communication capabilities; can include radio phones, pagers, and the Internet/ Personal digital assistant (PDA) with intranet access, web browser, memo pad, calendar, and/or global positioning system (GPS) receiver; and conventional laptop and/or palmtop Receiver or other electronic device including a radio telephone transceiver. In addition, the terminal can also include, but is not limited to, electronic book readers, smart wearable devices, mobile power sources (such as power banks, travel chargers), electronic cigarettes, wireless mice, wireless keyboards, wireless headphones, Bluetooth speakers, etc. Rechargeable electronic equipment.

1, the device 10 to be charged includes: a wireless receiving circuit 102, a control module 104, a voltage conversion module 106 and a battery 108.

Fig. 2 is a schematic structural diagram of a wireless charging system according to an exemplary embodiment. As shown in FIG. 2, the wireless charging system 1 includes: a power supply device 11, a wireless charging device 12 and a device 10 to be charged. It should be noted that, in order to simplify the drawings, the device to be charged 10 in FIG. 2 does not show a specific structure. For the specific structure of the device 10 to be charged, see FIG. 1.

The device 10 to be charged will be described in detail below with reference to FIGS. 1 and 2 in combination.

The power supply device 11 may be, for example, a power adapter, a power bank (Power Bank) and other equipment. The wireless charging device 12 may be, for example, a wireless charging base.

After the power supply device 11 is connected to the wireless charging device 12, the output current is transmitted to the wireless charging device 12.

The wireless charging device 12 includes a wireless transmitting circuit 121 and a first control module 122.

The wireless transmitting circuit 121 is used to convert the electric energy output by the power supply device 11 into electromagnetic signals (or electromagnetic waves) for transmission, so as to perform wireless charging for the device 10 to be charged. For example, the wireless transmission circuit 121 may include: a wireless transmission drive circuit and a transmission coil (or transmission antenna). The wireless transmission drive circuit is used to convert the direct current output by the power supply device 11 into high frequency alternating current, and convert the high frequency alternating current into an electromagnetic signal (or electromagnetic wave) through a transmitting coil or a transmitting antenna and transmit it out.

The first control module 122 may be implemented by, for example, a micro control unit (MCU). The first control module 122 may be used to perform wireless communication with the device 10 to be charged during the wireless charging process of the device 10 to be charged by the wireless charging device 12. Specifically, the first control module 122 can perform wireless communication with the control module 104 in the device 10 to be charged.

In addition, the wireless charging device 12 may further include a charging interface 123. The wireless transmitting circuit 121 can also be used to receive the electric energy output by the power supply device 11 through the charging interface 123 and generate an electromagnetic signal (or electromagnetic wave) according to the electric energy output by the voltage supply device 11.

The charging interface 123 may be, for example, a USB 2.0 interface, a Micro USB interface, or a USB TYPE-C interface. In some embodiments, the charging interface 123 may also be a lightning interface, or any other type of parallel port or serial port that can be used for charging.

The wireless receiving circuit 102 in the device to be charged 10 is used to receive the electromagnetic signal (or electromagnetic wave) emitted by the wireless transmitting circuit 121 and convert the electromagnetic signal (or electromagnetic wave) into the direct current output by the wireless receiving circuit 102. For example, the wireless receiving circuit 102 may include: a receiving coil or a receiving antenna, and a rectifying circuit and/or a filtering circuit connected to the receiving coil or the receiving antenna and other shaping circuits. The wireless receiving circuit 102 converts the electromagnetic signal (or electromagnetic wave) emitted by the wireless transmitting circuit 121 into alternating current through a receiving coil or a receiving antenna, and rectifies and/or filters the alternating current through a shaping circuit, thereby converting the alternating current into a stable Direct current to charge the battery 108.

It should be noted that the embodiment of the present disclosure does not specifically limit the specific form of the shaping circuit and the form of the output voltage and output current of the wireless receiving circuit 102 obtained after the shaping circuit is shaped.

When the output voltage of the wireless receiving circuit 102 cannot meet the requirements of the charging voltage expected by the battery 108, and/or the output current of the wireless receiving circuit 102 cannot meet the requirements of the expected charging current of the battery 108, you can set the first The voltage conversion module 106 on the charging channel 110 (for example, a wire) performs conversion to obtain the expected charging voltage and/or charging current of the battery 108. For example, the output voltage and output current of the wireless receiving circuit 102 are input into the voltage conversion module 106 through the first charging channel 110; after the voltage conversion module 106 converts the input voltage, the output voltage and current pass through the first charging channel 110 Loaded on both ends of the battery 108 to meet the expected charging voltage and/or charging current requirements of the battery 108.

The battery 108 may include a single cell or multiple cells. When the battery 108 includes multiple cells, the multiple cells may be connected in series. As a result, the charging voltage that the battery 108 can withstand is the sum of the charging voltages that a plurality of cells can withstand, which can increase the charging speed and reduce charging heat.

For example, taking the device to be charged 10 as a mobile phone as an example, when the battery 108 of the device to be charged 10 includes a single cell, the voltage of the internal single cell is generally between 3.0V and 4.35V. When the battery 108 of the device 10 to be charged includes two battery cells connected in series, the total voltage of the two battery cells connected in series is 6.0V-8.7V. Therefore, compared with a single cell, when multiple cells are connected in series, the output voltage of the wireless receiving circuit 102 can be increased. Compared with a single-cell battery, it achieves the same charging speed. The charging current required by a multi-cell battery is about 1/N of the charging current required by a single-cell battery (N is the series connection in the device to be charged 10). The number of batteries). In other words, under the premise of ensuring the same charging speed (same charging power), adopting a solution with multiple battery cells can reduce the size of the charging current, thereby reducing the heat generated by the device 10 to be charged during the charging process. On the other hand, compared with the single-cell solution, under the condition that the charging current remains the same, the multi-cell series solution can increase the charging voltage, thereby increasing the charging speed.

The control module 104 may be implemented by an independent MCU, or may also be implemented by an application processor (AP) inside the device 13 to be charged. The control module 104 is used to communicate with the first control module 122 in the wireless charging device 12.

The control module 104 communicates with the wireless charging device 12 in a wireless manner. The present disclosure does not limit the communication method and communication sequence between the wireless charging device 12 and the device 10 (control module 104) to be charged.

For example, it may be one-way wireless communication or two-way wireless communication. It may be a communication initiated by the device to be charged 10 or a communication initiated by the wireless charging device 12. During the wireless communication process, the device 10 to be charged can couple the information to be sent to the receiving coil of the wireless receiving circuit 102, and then send it to the transmitting coil of the wireless transmitting circuit 121, and then the wireless transmitting circuit 121 will decouple the information. The information is sent to the first control module 122. Conversely, in two-way communication, the wireless charging device 12 can couple the information to be sent to the transmitting coil of the wireless transmitting circuit 121 to send it to the receiving coil of the wireless receiving circuit 102 of the device to be charged 10, and then the device to be charged The receiving coil of the wireless receiving circuit 102 of 10 is decoupled.

Alternatively, the device 10 to be charged can also communicate via Bluetooth, WiFi, mobile cellular networks (such as 2G, 3G, 4G or 5G), wireless communications (such as IEEE 802.11, 802.15 (WPANs), 802.16 (WiMAX), 802.20, etc.), At least one of communication methods such as short-range wireless communication, optical communication (such as infrared communication), ultrasonic communication, and ultra-wideband (UMB) communication using a high-frequency antenna (such as 60 GHz) communicates with the wireless charging device 12. It is understandable that when communicating through the above-mentioned communication method, the device to be charged 10 and the wireless charging device 12 also include corresponding communication modules, such as a Bluetooth communication module, a WiFi communication module, a 2G/3G/4G/5G mobile communication module, High frequency antenna, optical communication module. At least one of an ultrasonic communication module, an ultra-wideband communication module, and the like. It should be understood that the aforementioned standards applicable to wireless communication include past and existing standards, and, without departing from the scope of the present disclosure, also include future versions and future standards that adopt these standards. By communicating through the above-mentioned wireless communication method, the reliability of communication can be improved, thereby improving charging safety. Compared with the related technology (for example, the Qi standard), the feedback information is coupled to the receiving coil of the wireless receiving circuit 102 for communication through signal modulation, which can improve the reliability of communication and avoid the use of signal coupling communication bands. The incoming voltage ripple affects the voltage processing process of the voltage conversion module 106 of the device 10 to be charged. In addition, for the voltage ripple when the wireless receiving coil is output, if the ripple is not effectively processed, it may cause wireless charging safety problems, and there are certain safety risks. Communication through the above-mentioned wireless communication method can eliminate voltage ripple, thereby eliminating the need for a circuit for processing voltage ripple, reducing the complexity of the charging circuit of the device 10 to be charged, improving charging efficiency, and saving circuit installation space, cut costs.

Fig. 3 is a block diagram showing a device to be charged according to an exemplary embodiment. As shown in FIG. 3, the wireless receiving circuit 102 may be implemented as a transmitting/receiving chip, for example, the control module 104 may be an application processor (AP) in the device to be charged, and the voltage conversion module 106 may be implemented, for example. It is a charging chip, specifically, for example, a charge pump (Chargepump).

Wherein, the control module 104 and the wireless receiving circuit 102 communicate through multiple pins. These pins may include: pins for transmitting clock signals (for example, pin 1 in Figure 3), pins for transmitting data (for example, pin 2 in Figure 3), and pins for transmitting signals Pins (for example, pins 3, 4, and 5 in Figure 3). The control module 104 and the voltage conversion module 106 are connected through a pin for transmitting a clock signal (for example, pin 6 in FIG. 3) and a pin for transmitting data (for example, pin 7 in FIG. 3) .

The following describes how the control module 104 in the device to be charged 10 performs wireless charging process control with reference to FIGS. 1 to 3.

The control module 104 is configured to determine whether the battery 108 meets the preset charging cut-off condition according to the acquired information of the battery 108; when the battery 108 meets the charging cut-off condition, stop charging the battery 108. For example, the control module 104 can control the voltage conversion module 106 to stop the voltage conversion module 106 from outputting the charging voltage and charging current to the battery 108.

Wherein, the charge cut-off condition includes at least one of the following conditions: the power of the battery reaches the preset cut-off power, the voltage of the battery is greater than the preset cut-off voltage, and the charging current of the battery is less than the preset cut-off current.

Correspondingly, the information of the battery 108 includes at least one of the following information: the power, voltage, and charging current of the battery 108.

Among them, the cut-off voltage and cut-off current are determined according to the battery temperature and the current wireless charging mode.

The wireless charging mode may include, for example, a first wireless charging mode and a second wireless charging mode. The first wireless charging mode may be a fast wireless charging mode. The second wireless charging mode may be referred to as a normal wireless charging mode. In the first wireless charging mode, the charging speed of the device 10 to be charged is faster than the charging speed in the second wireless charging mode. In other words, compared to the device to be charged 10 working in the second wireless charging mode, the device to be charged 10 working in the first wireless charging mode takes less time to charge a battery of the same capacity.

The normal wireless charging mode may refer to a wireless charging mode in which the transmission power of the wireless charging device 12 is small (usually less than 15W, and the commonly used transmission power is 5W or 10W). For example, it can be a traditional wireless charging mode based on the QI standard, the PMA standard, or the A4WP standard. In the normal wireless charging mode, it usually takes several hours to fully charge a large-capacity battery (such as a 3,000 mAh battery).

In the fast wireless charging mode, the transmission power of the wireless charging device 12 is relatively large (usually greater than or equal to 15W, such as 15-25W). Compared with the normal wireless charging mode, the charging time required for the wireless charging device 12 to fully charge the battery of the same capacity in the fast wireless charging mode can be significantly shortened and the charging speed is faster.

Table 1 shows the cut-off voltage and cut-off current at different temperatures and different wireless charging modes according to an exemplary embodiment.

Table 1

Among them, T indicates the temperature of the battery, BPP indicates the second wireless charging mode, EPP indicates the first wireless charging mode, Vbat indicates the voltage of the battery, and Icharge indicates the charging current of the battery.

As shown in Table 1, if the battery temperature is too high or too low, the cut-off voltage will be reduced. The most suitable temperature is approximately 16.5℃≤T<41℃. In this temperature range, the cut-off voltage can be set higher. In this way, higher battery power utilization can be obtained.

It should be noted that Table 1 is only an example, and does not limit the present disclosure.

The power, voltage, and charging current of the battery 108 can be obtained, for example, by a detection device built in the battery 108, for example, the power of the battery 108 can be measured by a fuel gauge.

Alternatively, the charging current of the battery 108 can also be measured by the detection circuit 112 shown in FIG. 1. The detection circuit 112 may include, for example, a current detection circuit for detecting the charging current output by the voltage conversion module 106. The current detection circuit may, for example, sample the charging current output by the voltage conversion module 106 through a current-sense resistor and a galvanometer.

In some embodiments, the control module 104 is used to determine whether the power of the battery 108 reaches the cut-off power, whether the voltage of the battery 108 is greater than the cut-off voltage, and whether the charging current of the battery 108 is less than the cut-off current. When the power of the battery 108 reaches the cut-off power, the voltage of the battery 108 is greater than the cut-off voltage, and the charging current of the battery 108 is less than the cut-off current, it is determined that the battery 108 meets the charge cut-off condition, and the charging of the battery 108 is cut off.

The cut-off power can be expressed as a percentage, such as 100%, that is, the cut-off power represents the power when the battery 108 is fully charged. Or, it can be 80%, and the cut-off power is expressed as 80% of the power when the battery 108 is fully charged.

It should be understood by those skilled in the art that if the battery 108 includes multiple cells and multiple cells are connected in series, in order to prevent overcharging of some of the cells, when one of the cells meets the charge cutoff condition, all the cells are cut off. The charging of the core means that the charging of the battery 108 is stopped.

After the device 10 to be charged is turned on, the control module 104 starts the wireless receiving circuit 102 by sending a first enable signal (for example, the enable signal sent through the pin 5 shown in FIG. 3) to the wireless receiving circuit 102. When receiving the first indication signal sent by the wireless receiving circuit 102 (for example, the signal sent by the wireless receiving circuit 102 through pin 4 shown in FIG. 3 and set to a high level), the control module 104 according to the preset period The time (for example, it can be 500 ms, but the present disclosure is not limited to this), the wireless charging process is started periodically. When receiving the second instruction signal sent by the wireless receiving circuit 102 (for example, the signal sent by the wireless receiving circuit 102 through pin 4 shown in FIG. 3 and set to a low level), the control module 104 exits the wireless charging Process.

In some embodiments, in the above-mentioned wireless charging process, the control module 104 periodically determines whether the battery 108 meets the charging cut-off condition according to the above-mentioned preset cycle time (such as 500 ms) and periodically according to the information of the battery 108. As described above, the control module 104 periodically determines whether the power of the battery 108 reaches the cut-off power, whether the voltage of the battery 108 is greater than the cut-off voltage, and whether the charging current of the battery 108 is less than the cut-off current. When the power of the battery 108 reaches the cut-off power, the voltage of the battery 108 is greater than the cut-off voltage, and the charging current of the battery 108 is less than the cut-off current, it is determined that the battery 108 meets the charge cut-off condition, and the charging of the battery 108 is cut off.

In addition, in the wireless charging process, after charging the battery 108 is stopped, the control module 104 will also periodically determine whether the battery 108 meets the recharging condition according to the above preset cycle time and periodically according to the obtained voltage of the battery 108. For example, the control module 108 determines whether the difference between the cut-off voltage and the voltage of the battery 108 is greater than a preset recharge threshold (for example, it can be set to 200mV), and when the difference is greater than the recharge threshold, it restarts the battery 108 Of charging. For example, the charging of the battery 108 can be restarted by controlling the voltage conversion module 106.

In addition, as shown in FIG. 3, the device to be charged 10 may further include: a load switching module 114 and a charging interface 116.

The charging interface 116 may be, for example, a USB 2.0 interface, a Micro USB interface, or a USB TYPE-C interface. In some embodiments, the charging interface 123 may also be a lightning interface, or any other type of parallel port or serial port that can be used for charging.

The device 10 to be charged can also be charged via the charging interface 116 based on the switching control of the load switching module 114, that is, directly connected to a power supply device (such as a power adapter) through the charging interface 116, and directly receives the power provided by the power supply device. .

It should be clearly understood that the present disclosure describes how to form and use specific examples, but the principles of the present disclosure are not limited to any details of these examples. On the contrary, based on the teaching of the contents of the present disclosure, these principles can be applied to many other embodiments.

It should be noted that the block diagram shown in the above drawings is a functional entity, and does not necessarily correspond to a physically or logically independent entity. These functional entities may be implemented in the form of software, or implemented in one or more hardware modules or integrated circuits, or implemented in different networks and/or processor devices and/or microcontroller devices.

The following are embodiments of the disclosed method, which can be applied to the above-mentioned device embodiments. For details not disclosed in the method embodiments of the present disclosure, please refer to the device embodiments of the present disclosure.

The wireless charging method 20 shown in FIG. 4 can be applied to the above-mentioned device to be charged 10, and specifically can be executed by the control module 104 in the device to be charged 10.

Referring to FIG. 4, the wireless charging method 20 includes:

In step S202, it is determined whether the battery meets a preset charging cut-off condition according to the acquired information of the battery in the device to be charged.

Correspondingly, the battery information includes at least one of the following information: battery power, voltage, and charging current.

Among them, the cut-off voltage and the cut-off power are both determined according to the battery temperature and the current wireless charging mode.

Among them, the wireless charging mode includes: a first wireless charging mode and a second wireless charging mode. The output power of the wireless charging device that wirelessly charges the device to be charged in the first wireless charging mode is greater than the output in the second wireless charging mode power.

In some embodiments, the wireless charging method shown in FIG. 5 further provides an embodiment of how to determine whether the battery meets the preset charging cut-off condition based on the acquired information of the battery in the device to be charged. Referring to FIG. 5, step S202 It can further include:

In step S2022, it is determined whether the power of the battery reaches the cut-off power, the voltage of the battery is greater than the cut-off voltage, and the charging current of the battery is less than the cut-off current.

In step S2024, when the power of the battery reaches the cut-off power, the voltage of the battery is greater than the cut-off voltage, and the charging current of the battery is less than the cut-off current, it is determined that the battery meets the charge cut-off condition.

In step S204, when the battery satisfies the charge cut-off condition, the charging of the battery is cut off.

In some embodiments, cutting off the charging of the battery includes: controlling the voltage conversion module in the device to be charged so that the voltage conversion module stops outputting the charging voltage and charging current to the battery.

According to the wireless charging method provided by the embodiments of the present disclosure, when determining the battery charging cut-off condition, it is not only judged according to the battery voltage, but also needs to consider whether the battery power reaches the preset cut-off power and whether the charging current meets the current cut-off condition , Which can provide more accurate judgment results. In addition, the cut-off voltage and cut-off current of the battery are set to different values according to different temperature ranges and different wireless charging modes, which can further improve the utilization efficiency of battery power.

Fig. 6 is a flow chart showing still another wireless charging method according to an exemplary embodiment. Similarly, the wireless charging method 30 shown in FIG. 6 can be applied to the control module 104 of the device 10 to be charged.

Referring to FIG. 6, the wireless charging method 30 includes:

In step S302, when the first instruction signal sent by the wireless receiving circuit is received, the wireless charging process is periodically started according to the preset period time.

In step S304, in the wireless charging process, according to the preset cycle time and periodically according to the acquired battery information, it is determined whether the battery satisfies the charge cut-off condition.

As mentioned above, the charging cut-off condition includes at least one of the following conditions: the battery power reaches the preset cut-off power, the battery voltage is greater than the preset cut-off voltage, and the battery charging current is less than the preset cut-off current.

In some embodiments, step S304 may also periodically execute step S2022 and step S2024 as shown in FIG. 5 to determine whether the battery meets the charge cut-off condition.

In step S306, when the battery meets the charge cutoff condition, the charging of the battery is cut off.

In addition, the wireless charging method 30 may further include:

In step S308, in the wireless charging process, after the battery charging is stopped, it is determined whether the difference between the cut-off voltage and the battery voltage is greater than the preset recharge threshold; when the difference between the cut-off voltage and the battery voltage is greater than the recharge When the threshold is reached, the charging of the battery is restarted.

In some embodiments, restarting the charging of the battery includes: controlling the voltage conversion module in the device to be charged, so that the voltage conversion module restarts the charging of the battery.

Those skilled in the art can understand that all or part of the steps for implementing the foregoing embodiments are implemented as a computer program executed by a processor. When the computer program is executed by the processor, it executes the above-mentioned functions defined by the above-mentioned method provided in the present disclosure. The program can be stored in a computer-readable storage medium, which can be a read-only memory, a magnetic disk, or an optical disk.

In addition, it should be noted that the above-mentioned drawings are only schematic illustrations of the processing included in the method according to the exemplary embodiment of the present disclosure, and are not intended for limitation. It is easy to understand that the processing shown in the above drawings does not indicate or limit the time sequence of these processings. In addition, it is easy to understand that these processes can be executed synchronously or asynchronously in multiple modules, for example.

The exemplary embodiments of the present disclosure are specifically shown and described above. It should be understood that the present disclosure is not limited to the detailed structure, arrangement or implementation method described herein; on the contrary, the present disclosure intends to cover various modifications and equivalent arrangements included in the spirit and scope of the appended claims.

Claims

A device to be charged is characterized in that it comprises:

battery;

The wireless receiving circuit is used to receive the electromagnetic signal emitted by the wireless charging device and convert the electromagnetic signal into an output current to charge the battery; and

The control module is electrically connected to the wireless receiving circuit, and is used to determine whether the battery meets the preset charging cut-off condition according to the acquired information of the battery; when the battery meets the charging cut-off condition, cut off the Battery charging;

Wherein, the charging cut-off condition includes at least one of the following conditions: the power of the battery reaches a preset cut-off power, the voltage of the battery is greater than the preset cut-off voltage, and the charging current of the battery is less than a preset cut-off voltage. Cut-off current;

Wherein, the cut-off voltage and the cut-off current are both determined according to the temperature of the battery and the current wireless charging mode;

Wherein, the wireless charging mode includes: a first wireless charging mode and a second wireless charging mode, and the output power of the wireless charging device in the first wireless charging mode is greater than the output in the second wireless charging mode power.
The device to be charged according to claim 1, wherein the control module is used to determine whether the power of the battery reaches the cut-off power, whether the voltage of the battery is greater than the cut-off voltage, and the power of the battery Whether the charging current is less than the cut-off current; when the power of the battery reaches the cut-off power, the voltage of the battery is greater than the cut-off voltage, and the charging current of the battery is less than the cut-off current, it is determined that the battery meets The charge cut-off condition cuts off the charging of the battery.
The device to be charged according to claim 1 or 2, wherein the control module is further configured to, when receiving the first indication signal sent by the wireless receiving circuit, periodically start the wireless Charging process; and in the wireless charging process, according to the preset cycle time, periodically according to the acquired information of the battery, it is determined whether the battery meets the charge cutoff condition.
The device to be charged according to claim 3, wherein the control module is further configured to determine the difference between the cut-off voltage and the voltage of the battery after the charging of the battery is cut off in the wireless charging process Whether the difference between is greater than a preset recharge threshold; when the difference between the cut-off voltage and the voltage of the battery is greater than the recharge threshold, restart the charging of the battery.
The device to be charged according to claim 3, wherein the control module is further configured to exit the wireless charging process when receiving a second instruction signal sent by the wireless receiving circuit.
The device to be charged according to claim 1 or 2, further comprising: a voltage conversion module connected to the control module and the battery; wherein the control module is used to control the voltage conversion module, So that the voltage conversion module stops outputting the charging voltage and charging current to the battery.
The device to be charged according to claim 6, further comprising: a current detection circuit, respectively connected to the control module and the voltage conversion circuit, and configured to connect to the battery output by the voltage conversion module The charging current is measured.
The device to be charged according to claim 1 or 2, wherein when the battery includes a plurality of battery cells connected in series, the battery meeting the charge cut-off condition includes: When one of them satisfies the charge cut-off condition, the battery satisfies the charge cut-off condition.
The device to be charged according to claim 1 or 2, further comprising: a charging interface and a switching module in charge, the load switching module is respectively connected to the charging interface and the control module, the load switching module For switching control, the battery is powered by the wireless receiving circuit or the charging interface.
The device to be charged according to claim 1 or 2, wherein the cut-off power is expressed as a percentage of the power when the battery is fully charged.
A wireless charging method applied to a device to be charged, characterized in that it includes:

According to the acquired information of the battery in the device to be charged, determine whether the battery meets a preset charging cut-off condition; and

When the battery meets the charge cut-off condition, stop charging the battery;

Wherein, the charging cut-off condition includes at least one of the following conditions: the power of the battery reaches a preset cut-off power, the voltage of the battery is greater than the preset cut-off voltage, and the charging current of the battery is less than a preset cut-off voltage. Cut-off current;

Wherein, the cut-off voltage and the cut-off current are both determined according to the temperature of the battery and the current wireless charging mode;

Wherein, the wireless charging mode includes: a first wireless charging mode and a second wireless charging mode, and the output power of the wireless charging device for wirelessly charging the device to be charged in the first wireless charging mode is greater than that in the The output power in the second wireless charging mode.
The method according to claim 11, wherein, according to the acquired information of the battery in the device to be charged, determining whether the battery satisfies a preset charging cut-off condition comprises:

Determining whether the power of the battery reaches the cut-off power, whether the voltage of the battery is greater than the cut-off voltage, and whether the charging current of the battery is less than the cut-off current; and

When the power of the battery reaches the cut-off power, the voltage of the battery is greater than the cut-off voltage, and the charging current of the battery is less than the cut-off current, it is determined that the battery meets the charge cut-off condition.
The method according to claim 11 or 12, characterized in that, before determining whether the battery meets the charging cut-off condition determined according to the preset cut-off power, cut-off voltage and cut-off current, the method further comprises: when receiving When the wireless receiving circuit sends the first indication signal, periodically start the wireless charging process according to the preset cycle time;

According to the acquired information of the battery in the device to be charged, determining whether the battery satisfies a preset charging cut-off condition includes: in the wireless charging process, according to the preset cycle time, periodically according to the acquired The battery information determines whether the battery meets the charge cut-off condition.
The method according to claim 13, further comprising: in the wireless charging process, after the charging of the battery is cut off, determining whether the difference between the cut-off voltage and the voltage of the battery is greater than a predetermined value. Set the recharge threshold; when the difference between the cut-off voltage and the voltage of the battery is greater than the recharge threshold, restart the charging of the battery.
The method according to claim 13, further comprising: exiting the wireless charging process when the second indication signal sent by the wireless receiving circuit is received.
The method according to claim 11 or 12, wherein stopping charging of the battery comprises: controlling a voltage conversion module in the device to be charged so that the voltage conversion module stops charging the battery output Voltage and charging current.
The method according to claim 16, characterized in that, before judging whether the battery satisfies a preset charging cut-off condition according to the acquired information of the battery in the device to be charged, the method further comprises: controlling the The current detection module in the device to be charged measures the charging current of the battery output by the voltage conversion module.
The method according to claim 11 or 12, wherein when the battery includes a plurality of battery cells connected in series, satisfying the charge cut-off condition of the battery includes: when determining one of the plurality of battery cells Once the charge cut-off condition is met, the battery meets the charge cut-off condition.
The method according to claim 11 or 12, wherein the cut-off power is expressed as a percentage of the power when the battery is fully charged.
A wireless charging system, comprising: the equipment to be charged, a wireless charging device, and a power supply device according to any one of claims 1-10; wherein the wireless charging device is used to convert the input electric energy Transmit into an electromagnetic signal to wirelessly charge the device to be charged; the power supply device is used to provide the input electric energy for the wireless charging device.