A wireless charging circuit and a wireless charging device

Abstract

This invention provides a wireless charging circuit and a wireless charging device, relating to the field of wireless charging technology. In this invention, a detection module detects the input voltage output by the battery module and outputs a voltage detection signal; a circuit selection module determines the connection circuit between the battery module and the wireless charging control module based on the voltage detection signal; the connection circuit includes a direct connection circuit and a non-direct connection circuit between the battery module and the wireless charging control module; the wireless charging control module is electrically connected to the battery module through the connection circuit selected by the circuit selection module, and is used to wirelessly charge the device to be charged based on the input voltage; wherein the device to be charged is placed in the wireless charging area of ​​the wireless charging device. During the wireless charging process, the direct connection between the battery module and the wireless charging control module not only improves the energy conversion rate and charging efficiency but also reduces the temperature of the wireless charging device.

Description

Technical Field

[0001] This utility model relates to the field of wireless charging technology, and in particular to a wireless charging circuit and a wireless charging system device. Background Technology

[0002] Currently, wireless charging devices typically need to adjust the battery cell voltage output by the battery module (i.e., the power supply module) during the wireless charging process to obtain the operating voltage (e.g., 5 volts) required by the wireless charging control module. In this way, the wireless charging control module can wirelessly charge the device under the aforementioned operating voltage.

[0003] However, using the aforementioned wireless charging devices to wirelessly charge devices results in significant energy transfer losses during the cell voltage adjustment process, leading to a low energy conversion efficiency and consequently affecting charging efficiency. Furthermore, these energy transfer losses cause the wireless charging device to overheat, impacting safety and user experience. Therefore, improving the energy conversion efficiency and charging efficiency of wireless charging devices, as well as reducing their temperature, are pressing issues that need to be addressed. Summary of the Invention

[0004] This utility model provides a wireless charging circuit and a wireless charging device to improve energy conversion efficiency and charging efficiency, and reduce the temperature of the wireless charging device during the wireless charging process.

[0005] In a first aspect, embodiments of the present invention provide a wireless charging circuit electrically connected to a battery module, wherein the battery module generates the input voltage of the wireless charging circuit, and the wireless charging circuit includes: a detection module, a circuit selection module, and a wireless charging control module; wherein... The detection module is electrically connected to the cell module, and the detection module is used to detect the input voltage output by the cell module and output a voltage detection signal. The circuit selection module is electrically connected to the detection module. The circuit selection module is used to determine the connection circuit between the battery cell module and the wireless charging control module based on the voltage detection signal. The connection circuit includes: a direct connection circuit and a non-direct connection circuit between the battery cell module and the wireless charging control module. The wireless charging control module is electrically connected to the detection module through the connection circuit selected by the circuit selection module, and the wireless charging control module is used to wirelessly charge the device to be charged based on the input voltage.

[0006] Secondly, this utility model provides a wireless charging device, which includes: a battery cell module and a wireless charging circuit as described in the first aspect; wherein, The battery module is used to generate the input voltage of the wireless charging circuit; The wireless charging circuit is electrically connected to the battery module. The wireless charging circuit is used to detect the input voltage and to access the input voltage based on the voltage detection signal of the input voltage.

[0007] Thirdly, this utility model provides a wireless charging system, which includes: a device to be charged and a wireless charging device as described in the second aspect, wherein the wireless charging device is used to wirelessly charge the device to be charged, which is placed in the wireless charging area of ​​the wireless charging device.

[0008] The beneficial effects of this utility model are as follows: In the wireless charging circuit provided in this embodiment of the invention, a detection module is electrically connected to the battery module. The detection module detects the input voltage output by the battery module and outputs a voltage detection signal. A circuit selection module is electrically connected to the detection module and determines the connection circuit between the battery module and the wireless charging control module based on the voltage detection signal. The connection circuit includes a direct connection circuit and a non-direct connection circuit between the battery module and the wireless charging control module. The wireless charging control module is electrically connected to the battery module through the connection circuit selected by the circuit selection module. The wireless charging control module is used to wirelessly charge the device to be charged based on the input voltage. The device to be charged is placed in the wireless charging area of ​​the wireless charging device. Using this method, the circuit selection module can determine whether the connection circuit between the battery module and the wireless charging control module is a direct connection circuit or a non-direct connection circuit based on the voltage detection signal output by the detection module. That is, the wireless charging control module can directly access the input voltage output by the battery module, and the wireless charging control module can be directly connected to the battery module. This reduces the circuit design between the battery module and the wireless charging control module, thereby reducing power transmission losses and improving the energy conversion efficiency and charging efficiency of the wireless charging device. Furthermore, compared to related technologies, the temperature of the wireless charging device is reduced during the wireless charging process by decreasing the number of modules (i.e., the number of heat-generating modules) between the battery cell module and the wireless charging control module.

[0009] Furthermore, other features and advantages of this invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described herein are used to provide a further understanding of this utility model, constitute a part of this utility model, and do not constitute an improper limitation of this utility model. In the accompanying drawings: Figure 1 This is a schematic diagram of the composition structure of a wireless charging circuit provided in an embodiment of the present invention.

[0011] Figure 2 This is a schematic diagram of the composition structure of another wireless charging circuit provided in an embodiment of the present utility model.

[0012] Figure 3 This is a schematic diagram of the composition structure of another wireless charging circuit provided in an embodiment of the present utility model.

[0013] Figure 4 A schematic diagram of the composition structure of another wireless charging circuit provided in this embodiment of the present invention. Figure 5 This is a schematic diagram of the composition structure of a wireless charging device provided in an embodiment of the present utility model.

[0014] Figure 6 This is a schematic diagram of the system architecture of an optional wireless charging system provided for an embodiment of the present utility model.

[0015] Reference numerals in the attached figures: 1. Wireless charging circuit; 11. Detection module; 12. Circuit selection module; 121. First switching unit; 122. Second switching unit; 13. Wireless charging control module; 131. Control unit; 132. Transmitting unit; 14. Voltage adjustment module; 15. Wired charging module; 16. Information acquisition module; 2. Battery cell module. Detailed Implementation

[0016] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings. Throughout the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0017] To enable those skilled in the art to better understand the solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. In the embodiments of this utility model, it should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0018] Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0019] In the description of the embodiments of this utility model, the words "example" or "for example" are used to indicate exemplification, illustration, or description. Any embodiment or design described as "example" or "for example" in the embodiments of this utility model is not to be construed as being more preferred or having more advantages than another embodiment or design. The use of the words "example" or "for example" is intended to present relative concepts in a clear manner. Furthermore, "multiple" in the embodiments of this utility model refers to two or more; therefore, "multiple" can also be understood as "at least two" in the embodiments of this utility model. "At least one" can be understood as one or more, for example, one, two, or more. For example, including at least one means including one, two, or more, and is not limited to which ones are included. For example, including at least one of A, B, and C, then it can include A, B, C, A and B, A and C, B and C, or A and B and C.

[0020] It should be noted that in this embodiment of the invention, "and / or" describes the relationship between the associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / ", unless otherwise specified, generally indicates that the preceding and following associated objects have an "or" relationship. It should be pointed out that in this embodiment of the invention, "connection" can be understood as an electrical connection. The connection between two electrical components can be a direct or indirect connection between the two electrical components. For example, the connection between A and B can be a direct connection between A and B, or an indirect connection between A and B through one or more other electrical components.

[0021] Furthermore, the names of the messages or information exchanged between the multiple devices in the embodiments of this utility model are for illustrative purposes only and are not intended to limit the scope of these messages or information.

[0022] The design concept of this utility model embodiment is briefly introduced below: Wireless charging devices are devices that use the principle of electromagnetic induction for charging. By placing a coil at the wireless charging transmitter (i.e., the wireless charging device) and a wireless charging receiver (i.e., the device to be charged), the coil at the wireless charging transmitter emits electromagnetic signals to the outside world under the action of electricity. After receiving the electromagnetic signals, the coil at the wireless charging receiver converts the electromagnetic signals into current, thereby achieving the purpose of wireless charging.

[0023] like Figure 1 As shown, during the wireless charging process, wireless charging devices typically need to adjust the cell voltage output by the battery module (e.g., through boosting) to obtain the operating voltage required by the wireless charging control module. With this operating voltage enabled, the wireless charging control module can then wirelessly charge the device. However, using the aforementioned wireless charging device results in significant energy transfer losses during the cell voltage adjustment process, leading to a low energy conversion efficiency and consequently affecting charging efficiency.

[0024] For example, the overall energy conversion efficiency of wireless charging devices is 64% - 68%, of which power loss related to voltage regulation accounts for 10% - 15%. Furthermore, power transmission losses can cause wireless charging devices to reach higher temperatures, thereby affecting their safety and user experience.

[0025] In view of this, in order to solve or improve the above problems, this utility model provides a wireless charging circuit, see reference. Figure 1As shown, the wireless charging circuit 1 may include a detection module 11, a circuit selection module 12, and a wireless charging control module 13. The wireless charging circuit 1 is electrically connected to the battery module 2, which generates the input voltage for the wireless charging circuit 1. This input voltage is used for the device to be charged (not in...). Figure 1 Wireless charging (as shown).

[0026] The detection module 11 is electrically connected to the battery cell module 2 and the circuit selection module 12. The wireless charging control module 13 is electrically connected to the battery cell module 2 through the connection circuit selected by the circuit selection module 12. The detection module 11 can be used to detect the input voltage output by the battery cell module 2 and output a voltage detection signal. Optionally, the aforementioned voltage detection signal can indicate whether the input voltage is within the operating voltage range set by the wireless charging control module 13.

[0027] The circuit selection module 12 can be used to determine the connection circuit between the battery cell module 2 and the wireless charging control module 13 based on the voltage detection signal. The connection circuit may include a direct connection circuit A and a non-direct connection circuit B between the battery cell module 2 and the wireless charging control module 13. The wireless charging control module 13 can be used to wirelessly charge the device to be charged based on the input voltage. The device to be charged can be placed in the wireless charging area of ​​the wireless charging device.

[0028] based on Figure 1 As shown in the wireless charging circuit 1, the circuit selection module 12 can determine whether the connection circuit between the battery cell module 2 and the wireless charging control module 13 is a direct connection circuit or a non-direct connection circuit based on the voltage detection signal output by the detection module 11. That is, the wireless charging control module 13 can be directly connected to the input voltage output by the battery cell module 2.

[0029] Since the wireless charging control module 13 can be directly connected to the battery cell module 2, the circuit design between the battery cell module 2 and the wireless charging control module 13 is reduced, thereby reducing power transmission losses and improving the energy conversion efficiency and charging efficiency of the wireless charging circuit 1. Furthermore, compared to related technologies, by reducing the number of heat-generating modules (i.e., the number of modules between the battery cell module 2 and the wireless charging control module 13), the temperature of the wireless charging circuit 1 is lowered during the wireless charging process of the device to be charged.

[0030] In an alternative implementation, the circuit selection module 12 can be used to select a direct connection circuit when the voltage detection signal indicates that the input voltage is within the operating voltage range set for the wireless charging control module 13, so that the wireless charging control module 13 is directly connected to the battery cell module 2 through the direct connection circuit.

[0031] Taking a working voltage range of [6V, 8V] as an example, if the input voltage is 7.3V, then the input voltage belongs to this working voltage range. In this case, the wireless charging control module 13 is directly connected to the battery module 2 via a direct connection circuit. That is, the wireless charging control module 13 can access the input voltage output by the battery module 2 through the circuit between the input terminal of the wireless charging control module 13 and the output terminal of the battery module 2. The wireless charging control module 13 can be used to control the transmission power based on the input voltage and the charging protocol type used by the device to be charged; wherein, the aforementioned transmission power is the charging power used by the wireless charging device to wirelessly charge the device to be charged. Using this method, controlling the transmission power based on the input voltage and the charging protocol type used by the device to be charged improves the compatibility between the transmission power and the device to be charged, further improving charging efficiency.

[0032] The device to be charged is placed in the wireless charging area of ​​the wireless charging device. The transmission power is the charging power of the wireless charging device for wirelessly charging the device to be charged. The aforementioned wireless charging device may include a battery module 2 and a wireless charging circuit 1. For example, the power range corresponding to the aforementioned charging power can be [5, 7.5] or [5, 15], with the unit being watts (W). This embodiment of the present invention does not specifically limit this range. In addition, the aforementioned charging power can also be referred to as the wireless charging output of the wireless charging circuit 1 or the wireless charging control module 13.

[0033] Optionally, the above-mentioned charging protocol types may include, but are not limited to, Apple's proprietary 7.5W protocol and Android devices' Qi standard wireless charging protocol. This embodiment of the present invention does not specifically limit these types.

[0034] For example, if the input voltage is 5V, it can be determined that the input voltage does not fall within the operating voltage range. In this case, to ensure that the wireless charging control module 13 can work normally, the wireless charging control module 13 cannot be directly connected to the battery cell module 2. In other words, it is necessary to adjust the input voltage to obtain the operating voltage of the wireless charging control module 13.

[0035] In one alternative implementation, see [link to relevant documentation]. Figure 2 As shown, the wireless charging control module 13 may include a control unit 131 and a transmitting unit 132. The output terminal of the control unit 131 is electrically connected to the input terminal of the transmitting unit 132.

[0036] The control unit 131 can be used to determine the charging protocol type of the device to be charged, and when the charging protocol type is a first charging protocol (e.g., the Qi standard wireless charging protocol for Android devices), adjust the transmission power of the wireless charging control module 13 based on a fixed frequency duty cycle mode; and when the charging protocol type is a second charging protocol (e.g., the 7.5W proprietary protocol for Apple devices), adjust the transmission power of the wireless charging control module 13 based on a variable frequency duty cycle mode. The transmitting unit 132 can be used to wirelessly charge the device to be charged based on the transmission power.

[0037] The aforementioned fixed-frequency duty cycle adjustment mode can also be called a fixed-frequency duty cycle power control method, and the aforementioned variable-frequency duty cycle adjustment mode can also be called a variable-frequency duty cycle power control method. The fixed-frequency duty cycle adjustment mode adjusts the duty cycle of the control signal corresponding to the transmit power at a fixed frequency (i.e., a fixed frequency), while the variable-frequency duty cycle adjustment mode adjusts the duty cycle of the control signal at a variable frequency. The aforementioned control signal can be a pulse width modulation (PWM) signal. Thus, by using either the fixed-frequency or variable-frequency duty cycle adjustment mode, the duty cycle of the PWM signal can be adjusted, thereby achieving accurate control of the transmit power of the transmitting unit 132.

[0038] Furthermore, the control unit 131 can be used to output a first control signal and generate a first drive signal for the transmitting unit 132 based on the first control signal when the fixed frequency duty cycle mode is adopted; and to output a second control signal and generate a second drive signal for the transmitting unit 132 based on the second control signal when the variable frequency duty cycle mode is adopted.

[0039] Accordingly, the transmitting unit 132 receives either the first driving signal or the second driving signal. The transmitting unit 132 can be used to output a corresponding transmission power based on the first driving signal or the second driving signal, so as to wirelessly charge the device to be charged using this transmission power. It should be understood that the aforementioned first control signal and the aforementioned first driving signal may be generated based on only one modulation frequency, while the aforementioned second control signal and the aforementioned second driving signal may be generated based on two or more modulation frequencies.

[0040] It should be understood that the control unit 131 may include a control subunit and an output subunit. The control subunit is used to output a first control signal or a second control signal, and the output subunit is used to generate a first drive signal for driving the transmitting unit 132 based on the first control signal or a second drive signal for driving the transmitting unit 132 based on the second control signal.

[0041] In one alternative implementation, the transmitting unit 132 may include a magnetic wireless charging module and / or a non-magnetic wireless charging module. It should be noted that the transmitting unit 132 is compatible with multiple wireless charging protocols; for example, it is compatible with Apple's 7.5W proprietary protocol and the Qi protocol used by other devices.

[0042] It is understandable that the transmitting unit 132 is the wireless charging transmitter of the wireless charging device. Correspondingly, the receiving unit on the device to be charged is the wireless charging receiver of the device to be charged.

[0043] Therefore, based on the above... Figure 2 The specific design of the wireless charging control module 13 shown allows for accurate control of wireless charging power by adjusting the duty cycle for different devices. Therefore, while further improving charging efficiency, it also reduces module heat generation in the wireless charging device, effectively controlling the surface temperature of the wireless charging device.

[0044] In an alternative implementation, the circuit selection module 12 can also be used to select a non-direct-connected circuit when the voltage detection signal indicates that the input voltage is not within the operating voltage range, so that the wireless charging control module 13 can be connected to the battery cell module 2 through the non-direct-connected circuit. See also... Figure 3 As shown, the wireless charging circuit 1 may further include a voltage adjustment module 14. The voltage adjustment module 14 is electrically connected to the detection module 11, and the battery module 2 is electrically connected to the wireless charging control module 13 via the voltage adjustment module 14 when the voltage detection signal indicates that the input voltage is not within the operating voltage range.

[0045] The voltage adjustment module 14 can be used to boost or buck the input voltage when the voltage detection signal indicates that the input voltage is not within the working voltage range, and output the target voltage that is within the working voltage range.

[0046] At this time, the wireless charging control module 13 can also be used to access the target voltage output by the voltage adjustment module 14, and control the transmission power based on the target voltage and the charging protocol type adopted by the device to be charged.

[0047] Taking the operating voltage range of [6V, 8V] as an example, if the input voltage is 4.8V, it can be determined that the input voltage does not belong to this operating voltage range. In this case, the input voltage can be boosted by the voltage adjustment module 14 to obtain a target voltage whose value belongs to the operating voltage range, such as a target voltage of 7V. If the input voltage is 10V, it can still be determined that the input voltage does not belong to this operating voltage range. In this case, the input voltage can be bucked by the voltage adjustment module 14 to obtain a target voltage whose value belongs to the operating voltage range, such as a target voltage of 7V. It should be noted that this embodiment of the invention does not specifically limit the value of the target voltage obtained through boosting or bucking, as long as the target voltage value belongs to the operating voltage range.

[0048] Based on the above method, it is ensured that when the input voltage is within the operating voltage range of the wireless charging control module 13, the wireless charging control module 13 can directly connect to the input voltage output by the battery cell module 2. It also enables the connection of the target voltage when the input voltage is not within the operating voltage range set for the wireless charging control module 13. Therefore, by directly connecting the battery cell module 2 to the input voltage within its operating voltage range, and by connecting the target voltage outside its operating voltage range through the voltage adjustment module 14, the wireless charging control module 13 improves the energy conversion efficiency and charging efficiency of the wireless charging device, reduces the temperature of the wireless charging device, and ensures a wide range of voltage access.

[0049] In the process of controlling the transmission power based on the target voltage and charging protocol type, the control unit 131 can also be used to adjust the transmission power of the wireless charging control module 13 based on the fixed frequency voltage regulation mode when the charging protocol type of the device to be charged is the first charging protocol (e.g., the Qi standard wireless charging protocol of Android devices); and to adjust the transmission power of the wireless charging control module 13 based on the variable frequency voltage regulation mode when the charging protocol type of the device to be charged is the second charging protocol (e.g., the 7.5W proprietary protocol of Apple devices).

[0050] The aforementioned fixed-frequency voltage regulation mode can also be called a fixed-frequency voltage regulation power control method, and the aforementioned variable-frequency voltage regulation mode can also be called a variable-frequency voltage regulation power control method. The fixed-frequency voltage regulation mode is a method of adjusting the voltage of the control signal corresponding to the transmission power at a fixed frequency, while the variable-frequency voltage regulation mode is a method of adjusting the voltage of the control signal at a variable frequency. The aforementioned control signal can still be a PWM signal. Thus, by using a voltage-based power control method, the voltage amplitude of the PWM signal can be adjusted, thereby achieving accurate control of the transmission power of the transmitting unit 132.

[0051] Furthermore, the control unit 131 can also be used to output a third control signal and generate a third drive signal for the transmitting unit 132 based on the third control signal when using a fixed-frequency voltage regulation mode; and to generate a fourth drive signal for the transmitting unit 132 based on a fourth control signal when using a variable-frequency voltage regulation mode. Correspondingly, the transmitting unit 132 receives either the third drive signal or the fourth drive signal. The transmitting unit 132 can also be used to output a corresponding transmission power based on the third drive signal or the fourth drive signal, so as to wirelessly charge the device to be charged using this transmission power. It should be understood that the aforementioned third control signal and the aforementioned third drive signal may be generated based on only one modulation frequency, while the aforementioned fourth control signal and the aforementioned fourth drive signal may be generated based on two or more modulation frequencies.

[0052] Therefore, high-precision transmission power adjustment can be achieved through fixed-frequency voltage regulation mode or variable-frequency voltage regulation mode. In order to reduce the heat generation of each module in the wireless charging circuit 1 during the wireless charging process and improve the adjustment efficiency and response speed, the control unit 131 can also control the transmission power through fixed-frequency duty cycle adjustment mode or variable-frequency duty cycle adjustment mode.

[0053] In one alternative implementation, see [link to relevant documentation]. Figure 4 As shown, the circuit selection module 12 may include a first switching unit 121 and a second switching unit 122. The first switching unit 121 is used to select a direct-connect circuit and connect the battery cell module 2 and the wireless charging control module 13 when the voltage detection signal indicates that the input voltage is within the aforementioned operating voltage range; and to disconnect the circuit connection between the battery cell module 2 and the wireless charging control module 13 when the voltage detection signal indicates that the input voltage is not within the operating voltage range. The second switching unit 122 is used to select a non-direct-connect circuit and connect the battery cell module 2 and the voltage adjustment module 14 when the voltage detection signal indicates that the input voltage is not within the operating voltage range; and to disconnect the circuit connection between the battery cell module 2 and the voltage adjustment module 14 when the voltage detection signal indicates that the input voltage is within the operating voltage range.

[0054] Still Figure 4 As shown, the wireless charging circuit 1 may further include a wired charging module 15 connected to the voltage adjustment module 14. The wired charging module 15 can be used to wire-charge the device to be charged based on the charging voltage output by the voltage adjustment module 14. Thus, the wireless charging device can be used not only in wireless charging scenarios but also in wired charging scenarios. The aforementioned charging voltage can also be referred to as the power bank output or wired charging output of the wireless charging circuit 1 or the wireless charging device.

[0055] In one alternative implementation, it is still as follows Figure 4As shown, the wireless charging circuit 1 may further include an information acquisition module 16. The two ends of the information acquisition module 16 are respectively connected to the input terminal of the voltage adjustment module 14 and the input terminal of the wireless charging control module 13. The information acquisition module 16 can be used to acquire multiple status parameters of the wireless charging device during the wireless charging process of the device to be charged. For example, the information acquisition module 16 can acquire multiple status parameters of the wireless charging device during the wireless charging process of the device to be charged in real time or according to a set information acquisition period (e.g., 10 seconds). The aforementioned multiple status parameters may include, but are not limited to, the surface temperature of the wireless charging device and the charging time.

[0056] After collecting the aforementioned multiple status parameters, the information collection module 16 can inform the user through a display screen or voice, so that the user can promptly understand the status of the wireless charging circuit 1. Furthermore, the information collection module 16 can also determine whether there are any abnormal status parameters among the aforementioned multiple status parameters by combining the parameter thresholds set for each of the multiple status parameters, and promptly inform the user if any abnormal status parameters are found.

[0057] To reduce the load on the wireless charging control module 13, the information acquisition module 16 can implement some of the functions of the wireless charging control module 13. For example, when the input voltage is not within the operating voltage range, the information acquisition module 16 can control the transmission power based on the target voltage output by the voltage adjustment module 14 and the voltage adjustment control method set for the charging protocol type.

[0058] In summary, in the wireless charging circuit provided by this embodiment, when the detection module detects that the output voltage of the battery module belongs to the operating voltage range set for the wireless charging control module, the wireless charging control module can directly connect to the input voltage. This realizes a circuit design of "power supply module → wireless charging control module → transmission power output," reducing the circuit design between the battery module and the wireless charging control module (i.e., the battery module is directly connected to the wireless charging control module), reducing power transmission losses, and improving the energy conversion efficiency and charging efficiency of the wireless charging device. Furthermore, compared to related technologies, because the number of heat-generating modules is reduced (e.g., the direct connection circuit between the battery module and the wireless charging control module does not include a voltage adjustment module), the temperature of the wireless charging device is reduced during wireless charging. In addition, controlling the transmission power based on the input voltage and the charging protocol type used by the device improves the compatibility between the transmission power and the device, further improving charging efficiency.

[0059] Furthermore, based on the same technical concept, this utility model embodiment provides a wireless charging device, see reference. Figure 5As shown, the wireless charging device may include: Figure 1 , 2 The wireless charging circuit 1 and the battery module 2 are shown in Figures 3 or 4. The wireless charging circuit 1 and the battery module 2 are electrically connected.

[0060] The battery cell module 2 can be used to generate an input voltage. The wireless charging circuit 1 can be used to detect the input voltage and connect the input voltage based on the voltage detection signal. For example, when the voltage detection signal indicates that the input voltage belongs to the operating voltage range set for the wireless charging control module 13 included in the wireless charging circuit 1, the wireless charging control module 13 can be directly connected to the battery cell module 2. When the voltage detection signal indicates that the input voltage does not belong to the operating voltage range set for the wireless charging control module 13, the wireless charging control module 13 can be connected to the battery cell module 2 via the voltage adjustment module 14 included in the wireless charging circuit 1. In this way, the wireless charging circuit 1 can select the connection circuit for connecting the input voltage based on the voltage detection signal of the input voltage, that is, select the direct connection circuit of the wireless charging control module 13 directly connecting to the battery cell module 2, or select the non-direct connection circuit of the battery cell module 2 connected via the voltage adjustment module 14.

[0061] It should be understood that once the wireless charging device detects a device in urgent need of charging (i.e., a device to be charged) placed in its wireless charging area, it can generate an input voltage (e.g., 7V) through the battery module 2 to wirelessly charge the device. Optionally, when the remaining power of a device (e.g., 5% of the device's battery capacity) is less than a preset power threshold (e.g., 8% of the device's electric field capacity), it can be considered a device to be charged; conversely, when the remaining power of a device is greater than or equal to the aforementioned preset power threshold, the device cannot be considered a device to be charged.

[0062] Furthermore, the cell module 2 can be various types of energy storage devices or equipment. For example, the cell module 2 can be a storage battery, a lithium-ion battery, a dry cell battery, etc., and this embodiment of the present invention does not specifically limit it in this regard.

[0063] Furthermore, based on the same technical concept, this utility model embodiment also provides a wireless charging system, see reference. Figure 6 The diagram shown illustrates the system architecture of an optional wireless charging system according to an embodiment of this utility model. The wireless charging system may include: Figure 5 The diagram shows a wireless charging device and a device to be charged. The wireless charging device is used to wirelessly charge the device to be charged when placed in the wireless charging area of ​​the wireless charging device.

[0064] Furthermore, it should be understood that the above-disclosed embodiments are merely preferred embodiments of the present utility model and are not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the content of the technical solution described in the present utility model shall still fall within the scope of the present utility model.

Claims

1. A wireless charging circuit electrically connected with a cell module, the cell module being configured to generate an input voltage for the wireless charging circuit, characterized in that, include: The module comprises a detection module, a circuit selection module, and a wireless charging control module; among which, The detection module is electrically connected to the cell module, and the detection module is used to detect the input voltage output by the cell module and output a voltage detection signal. The circuit selection module is electrically connected to the detection module. The circuit selection module is used to determine the connection circuit between the battery cell module and the wireless charging control module based on the voltage detection signal. The connection circuit includes: a direct connection circuit and a non-direct connection circuit between the battery cell module and the wireless charging control module. The wireless charging control module is electrically connected to the battery cell module through the connection circuit selected by the circuit selection module, and the wireless charging control module is used to wirelessly charge the device to be charged based on the input voltage.

2. The wireless charging circuit as described in claim 1, characterized in that, The circuit selection module is used to select the direct connection circuit when the voltage detection signal indicates that the input voltage belongs to the operating voltage range set for the wireless charging control module, so that the wireless charging control module is directly connected to the battery cell module through the direct connection circuit.

3. The wireless charging circuit of claim 2, wherein, The wireless charging control module includes: A control unit is configured to determine the charging protocol type of the device to be charged, and, when the charging protocol type is a first charging protocol, adjust the transmission power of the wireless charging control module based on a fixed-frequency duty cycle mode; and, When the charging protocol type is the second charging protocol, the transmission power of the wireless charging control module is adjusted based on the frequency conversion duty cycle mode; A transmitting unit, the input of which is electrically connected to the output of the control unit, is used to wirelessly charge the device to be charged based on the transmitting power.

4. The wireless charging circuit as described in claim 3, characterized in that, The control unit is used to output a first control signal when the fixed frequency duty cycle mode is adopted, and to generate a first drive signal for the transmitting unit based on the first control signal; And, when the frequency conversion duty cycle mode is used, a second control signal is output, and a second drive signal for the transmitting unit is generated based on the second control signal; The transmitting unit is configured to output the corresponding transmitting power based on the first driving signal or the second driving signal, so as to wirelessly charge the device to be charged through the transmitting power.

5. The wireless charging circuit as described in claim 3, characterized in that, The circuit selection module is further configured to select the non-directly connected circuit when the voltage detection signal indicates that the input voltage does not belong to the operating voltage range; The wireless charging circuit also includes: A voltage adjustment module is electrically connected to the detection module, and the cell module is electrically connected to the wireless charging control module through the voltage adjustment module when the voltage detection signal indicates that the input voltage is not within the working voltage range. The voltage adjustment module is used to boost or buck the input voltage and output a target voltage that belongs to the working voltage range. The control unit is further configured to adjust the transmission power of the wireless charging control module based on a fixed-frequency voltage regulation mode when the charging protocol type is the first charging protocol; and, When the charging protocol type is the second charging protocol, the transmission power of the wireless charging control module is adjusted based on the frequency conversion voltage regulation mode.

6. The wireless charging circuit of claim 5, wherein, The circuit selection module includes: The first switching unit is used to select the direct connection circuit and connect the battery cell module and the wireless charging control module when the voltage detection signal indicates that the input voltage belongs to the working voltage range; And, when the voltage detection signal indicates that the input voltage does not belong to the operating voltage range, the circuit connection between the battery cell module and the wireless charging control module is disconnected; The second switching unit is used to select the non-direct-connected circuit and connect the cell module and the voltage adjustment module when the voltage detection signal indicates that the input voltage does not belong to the working voltage range; Furthermore, when the voltage detection signal indicates that the input voltage belongs to the operating voltage range, the circuit connection between the cell module and the voltage adjustment module is disconnected.

7. The wireless charging circuit as described in claim 5, characterized in that, The control unit is further configured to output a third control signal and generate a third drive signal for the transmitting unit based on the third control signal when a fixed-frequency voltage regulation mode is used; and to output a fourth control signal and generate a fourth drive signal for the transmitting unit based on the fourth control signal when a variable-frequency voltage regulation mode is used. The transmitting unit is further configured to output the corresponding transmitting power based on the third driving signal or the fourth driving signal, so as to wirelessly charge the device to be charged through the transmitting power.

8. The wireless charging circuit of any one of claims 4-6, wherein, The wireless charging circuit also includes a wired charging module connected to the voltage adjustment module; The wired charging module is used to perform wired charging of the device to be charged based on the charging voltage output by the voltage adjustment module.

9. The wireless charging circuit of any one of claims 1-6, wherein, The wireless charging circuit also includes: The information acquisition module is used to acquire multiple status parameters during the wireless charging process of the wireless charging device to the device to be charged; the multiple status parameters include: the surface temperature of the wireless charging device and the charging time. The wireless charging control module is also used to adjust the transmission power based on the plurality of status parameters.

10. A wireless charging device, comprising: include: The battery cell module and the wireless charging circuit as described in any one of claims 1-9; wherein, The battery module is used to generate the input voltage of the wireless charging circuit; The wireless charging circuit is electrically connected to the battery module. The wireless charging circuit is used to detect the input voltage and to access the input voltage based on the voltage detection signal of the input voltage.

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