Wireless charging system and electronic equipment

Abstract

The utility model relates to the technical field of wireless charging, in particular to a wireless charging system and electronic equipment. The wireless charging system comprises a power supply module, a main control chip, a temperature monitoring module, a frequency conversion charging module and a charging coil, the power supply module is electrically connected with the main control chip, the temperature monitoring module and the variable-frequency charging module, the main control chip is in communication connection with the temperature monitoring module and the variable-frequency charging module, and the variable-frequency charging module is electrically connected with the charging coil; the main control chip obtains the temperature information of the charging coil through the temperature monitoring module, and controls the working frequency of the frequency conversion charging module according to the temperature information, so that the frequency conversion charging module provides charging services with different powers for the power receiving device through the charging coil. According to the scheme, the working frequency of the variable-frequency charging module can be controlled according to the temperature information, the relatively high working frequency is maintained when the temperature is relatively low, the relatively low working frequency is adjusted when the temperature is relatively high, the heating condition of the charging coil is relieved, and the charging efficiency of the system is optimized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wireless charging, in particular to a wireless charging system, namely an electronic device. BACKGROUND

[0002] In recent years, as a new and practical automobile accessory, the vehicle-mounted wireless charger has been widely popularized and applied. It allows the driver to charge the mobile phone and other devices through the wireless charger placed in the car without cumbersome plugging and unplugging during driving, greatly improving the convenience and safety of driving. However, the heating phenomenon of the wireless charger is increasingly serious. Due to the limitation of electric energy conversion efficiency and the fact that energy transmission between coils is not 100% perfect, a certain amount of energy loss will occur. Most of these lost energy will be converted into heat energy, causing the wireless charger to heat up. The overheating of the wireless charger not only reduces its service life, but also may damage the surrounding electronic components and even cause safety hazards. Therefore, how to solve the heating problem during wireless charging has become a key problem to be solved in the current wireless charging technology field. CONTENT OF THE INVENTION

[0003] The embodiment of the present application mainly solves the technical problem that the wireless charging is seriously damaged by heating in the related art.

[0004] To solve the above technical problems, one technical scheme adopted by the embodiment of the present application is to provide a wireless charging system, comprising a power supply module, a main control chip, a temperature monitoring module, a variable frequency charging module and a charging coil; the power supply module is electrically connected with the main control chip, the temperature monitoring module and the variable frequency charging module respectively to provide direct current power supply; the main control chip is in communication connection with the temperature monitoring module and the variable frequency charging module respectively; the variable frequency charging module is electrically connected with the charging coil; the main control chip is used to acquire temperature information of the charging coil through the temperature monitoring module, and control the working frequency of the variable frequency charging module according to the temperature information, so that the variable frequency charging module provides charging services with different power for the powered device through the charging coil, wherein when the temperature information is lower than a preset threshold, the variable frequency charging module is controlled to be at a first working frequency, and when the temperature information is higher than the preset threshold, the variable frequency charging module is controlled to be at a second working frequency until the temperature information is lower than the preset threshold, and the second working frequency is less than the first working frequency.

[0005] In some embodiments, the variable frequency charging module further comprises a charging conversion unit and at least two resonance loop units, the charging conversion unit is electrically connected with the master control chip and the power supply module respectively, each of the resonance loop units is connected with the charging conversion unit and the charging coil respectively; the master control chip is configured to control the number of turned-on resonance loop units according to the temperature information, wherein when the temperature information is higher than a preset threshold, the number of turned-on resonance loop units is increased until the temperature information is lower than the preset threshold; the charging conversion unit is configured to provide alternating current power to the charging coil in combination with the turned-on resonance loop units to provide charging service for the powered device.

[0006] In some embodiments, the charging conversion unit comprises a step-down converter and an inverter, the step-down converter is electrically connected with the power supply module and the inverter, and the inverter is electrically connected with the charging coil; a PWM channel of the master control chip is connected with the inverter, and the master control chip is connected with the step-down converter through a communication bus.

[0007] In some embodiments, the resonance loop unit comprises a resonance switch and a resonance capacitor, a first end of the resonance capacitor is connected to the charging conversion unit through the resonance switch, a second end of the resonance capacitor is connected to the charging coil, and a control end of the resonance switch is connected to the master control chip.

[0008] In some embodiments, the power supply module comprises a connector, the connector is connected with a power source and the step-down converter.

[0009] In some embodiments, the power supply module further comprises a low dropout linear regulator and a power converter, the power converter is connected with the connector and the low dropout linear regulator respectively, and the low dropout linear regulator is connected with the master control chip to provide direct current power supply for the master control chip.

[0010] In some embodiments, the temperature monitoring module comprises an NTC resistor, the NTC resistor is arranged within a preset range of the charging coil, and the master control chip acquires temperature information of the charging coil through the NTC resistor.

[0011] In some embodiments, the system further comprises a communication module, the communication module comprises a CAN chip and a CAN bus, and the CAN chip is communicatively connected with the master control chip through the CAN bus.

[0012] In some embodiments, the system further comprises an NFC module, the NFC module comprises an NFC chip and an NFC antenna, the NFC chip and the NFC antenna are communicatively connected, and the NFC chip is electrically connected with the master control chip.

[0013] To solve the above technical problems, another technical solution adopted by the embodiments of the present application is to provide an electronic device comprising the wireless charging system as described above.

[0014] Different from the related art, the embodiments of the present application provide a wireless charging system and an electronic device. The wireless charging system comprises a power supply module, a master control chip, a temperature monitoring module, a variable frequency charging module and a charging coil. The power supply module is electrically connected with the master control chip, the temperature monitoring module and the variable frequency charging module to provide direct current power supply. The master control chip is in communication connection with the temperature monitoring module and the variable frequency charging module. The variable frequency charging module is electrically connected with the charging coil. The master control chip is configured to acquire temperature information of the charging coil through the temperature monitoring module. The master control chip is configured to control the working frequency of the variable frequency charging module according to the temperature information, so that the variable frequency charging module provides charging services with different power for the powered device through the charging coil. When the temperature information is lower than a preset threshold, the variable frequency charging module is controlled to have a first working frequency. When the temperature information is higher than the preset threshold, the variable frequency charging module is controlled to have a second working frequency. The second working frequency is lower than the first working frequency until the temperature information is lower than the preset threshold. In this scheme, the master control chip acquires the temperature information of the charging coil in combination with the temperature monitoring module, and controls the working frequency of the variable frequency charging module according to the temperature information, specifically controls the number of conduction of the resonant loop unit. When the temperature is relatively low, a relatively high working frequency is maintained. When the temperature is relatively high, a relatively low working frequency is adjusted. In this way, the heating of the charging coil is relieved, and the charging efficiency of the system is optimized. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a structural block diagram of a wireless charging system provided by the embodiments of the present application;

[0016] Figure 2 is a structural block diagram of another wireless charging system provided by the embodiments of the present application;

[0017] Figure 3 is a structural schematic diagram of a wireless charging system provided by the embodiments of the present application. DETAILED DESCRIPTION

[0018] For the convenience of understanding the present application, the present application will be described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when one element is described as "connected" to another element, it can be directly connected to the other element or one or more intervening elements can be present therebetween. The terms "first", "second", and the like used in the specification are only for the purpose of description and should not be understood as indicating or implying relative importance. Unless otherwise defined, all technical and scientific terms used in the specification have the same meaning as understood by those skilled in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing the specific embodiments and are not used to limit the present application. The term "and / or" used in the specification includes any and all combinations of one or more related listed items.

[0019] Currently, vehicle-mounted wireless chargers are widely used in daily life. However, with the continuous increase of charging power, the heating problem of wireless chargers has become increasingly prominent, becoming a technical bottleneck restricting its further development. Traditional wireless charging technology usually uses a single resonance frequency point for energy transmission, which often leads to low charging efficiency and serious heating during high-power charging, not only affecting user experience, but also possibly causing damage to the device.

[0020] To solve the above problems, the embodiments of the present application provide a wireless charging system, please combine Figure 1 The wireless charging system 100 includes a power supply module 110, a master control chip 120, a temperature monitoring module 150, a variable frequency charging module 130, and a charging coil 140. The power supply module 110 is electrically connected to the master control chip 120, the temperature monitoring module 150, and the variable frequency charging module 130, respectively, to provide direct current power supply for them. The master control chip 120 is in communication connection with the temperature monitoring module 150 and the variable frequency charging module 130, respectively, and the variable frequency charging module 130 is electrically connected to the charging coil 140. The master control chip 120 can obtain the temperature information of the charging coil 140 through the temperature monitoring module 150. In actual scene application, the temperature monitoring module 150 is arranged close to the charging coil 140, which is convenient for real-time acquisition of the temperature information of the charging coil 140. The temperature monitoring module 150 can be an NTC (Negative Temperature Coefficient) related device, such as a thermistor, an NTC temperature sensor, etc., which, in combination with the master control chip 120, monitors the temperature information of the charging coil 140 in real time.

[0021] The main control chip 120 can control the working frequency of the variable frequency charging module 130 according to the temperature information, so that the variable frequency charging module 130 provides charging services with different power for the powered device 200 through the charging coil 140. Specifically, when the temperature information is lower than the preset threshold, the variable frequency charging module 130 is controlled to be at a first working frequency; when the temperature information is higher than the preset threshold, the variable frequency charging module 130 is controlled to be at a second working frequency, until the temperature information is lower than the preset threshold, and the second working frequency is less than the first working frequency. The temperature information in the embodiment of the application can be set by the engineer according to his own experience or past temperature-related data, for example, set to about 45°C, when it is detected that the temperature information of the charging coil 140 exceeds this value, the working frequency of the variable frequency charging module is controlled to be reduced, thereby reducing the adverse consequences caused by the temperature of the charging coil 140 or related components being too high during the charging process.

[0022] In some embodiments, please refer to Figure 2 The variable frequency charging module 130 further includes a charging conversion unit 131 and at least two resonant loop units 132, the charging conversion unit 131 is electrically connected with the main control chip 120 and the power supply module 110 respectively, and each resonant loop unit 132 is connected with the charging conversion unit 131 and the charging coil 140 respectively. The main control chip 120 can control the number of resonant loop units 132 turned on according to the temperature information, wherein when the temperature information is higher than the preset threshold, the number of resonant loop units 132 turned on is increased until the temperature information is lower than the preset threshold. The charging conversion unit 131 can provide alternating current power to the charging coil 140 in combination with the resonant loop unit 132 turned on, when the alternating current power signal passes through the charging coil 140, a magnetic field will be formed around the charging coil 140, the alternating current signal causes the magnetic field to change constantly, and the above constantly changing magnetic field is the medium for the transmission of electric energy in the wireless charging system, thereby providing charging services for the powered device 200 through the receiving coil 210.

[0023] Electromagnetic induction not only enables relatively efficient energy transfer, especially over short distances, but also provides a stable charging method, reducing fluctuations and interference during the charging process. Furthermore, the components of electromagnetic induction are relatively simple, easy to manufacture and assemble, and have low manufacturing costs, contributing to a reduction in the overall cost of the wireless charging system. In addition, the versatility and flexibility of electromagnetic induction make wireless charging systems compatible with various devices. The receiving device 200 can be a mobile terminal such as a mobile phone or tablet; the following description uses a mobile phone as an example. For instance, the charging coil 140 can communicate with the receiving coil 210 in the mobile phone via FSK (Frequency Shift Keying) and ASK (Amplitude Shift Keying). The mobile phone reads the key stored in the main control chip 120 and performs a private wireless charging protocol identity verification. It then returns the verified private wireless charging protocol to the main control chip 120. The main control chip 120, based on the received private wireless charging protocol and in conjunction with the frequency conversion charging module 130, controls the output power of the charging coil 140.

[0024] by Figure 2 For example, assuming that resonant circuit unit 132a is turned on during the current charging state, charging conversion unit 131, together with resonant circuit unit 132a, provides AC power to charging coil 140 so that charging coil 140 can charge mobile phone; if at this time the main control chip 120 obtains through temperature monitoring module 150 that the temperature of charging coil 140 gradually rises to exceed the preset threshold, it will control another resonant circuit unit 132 to turn on, for example, control resonant circuit unit 132b to turn on, so that charging conversion unit 131, together with resonant circuit unit 132a and resonant circuit unit 132b, jointly provides AC power to charging coil 140 to provide wireless charging service for mobile phone.

[0025] Generally, the charging power is approximately constant when charging the mobile phone. For example, if the mobile phone itself requires a charging power of 50 W, and the private wireless charging protocol identity of the mobile terminal 200 is verified, the wireless charging system 100 can supply power according to the power required by the mobile phone itself, that is, it can be set to a fixed charging power of 50 W. On this basis, compared to the case where the single-resonance loop unit 132a is turned on, when the temperature rises, the resonant loop unit 132a and the resonant loop unit 132b are switched to be turned on together. During this process, the AC power is provided to the charging coil 140 by one resonant loop unit (132a), which is changed to two resonant loop units (132a and 132b). The resonant frequency of the system is switched from one to two, the operating frequency of the variable frequency charging module 130 is reduced, the heating condition is alleviated, the temperature of the charging coil 140 is reduced, the heating condition of the system is alleviated, and the device overheating is prevented to cause circuit damage or reduce the charging efficiency. When the temperature of the charging coil 140 is reduced to below the preset threshold, the main control chip 120 can control the resonant loop unit 132b to be disconnected, and the resonant loop unit 132a is still combined with the charging conversion unit 131 to provide AC power to the charging coil 140. On the basis of ensuring controllable heating, the system power consumption is saved, and the power conversion efficiency in the entire charging process is as high as possible. Therefore, the present scheme can obtain the temperature information of the charging coil by the main control chip combined with the temperature monitoring module, and control the number of resonant loop units turned on according to the temperature information, thereby alleviating the heating condition of the charging coil and optimizing the charging efficiency of the system.

[0026] In the wireless charging system provided by the embodiments of the present application, the resonant loop unit 132 includes a resonant switch and a resonant capacitor. Please refer to Figure 3 For example, the resonant loop unit 132a, the first end of the resonant capacitor C1 is connected to the charging conversion unit 131 through the resonant switch Q1, the second end of the resonant capacitor C1 is connected to the charging coil 140, and the control end of the resonant switch Q1 is connected to the main control chip 120. Similarly, in the resonant loop unit 132b, the first end of the resonant capacitor C2 is connected to the charging conversion unit 131 through the resonant switch Q2, the second end of the resonant capacitor C2 is connected to the charging coil 140, and the control end of the resonant switch Q2 is connected to the main control chip 120. The main control chip 120 controls the on-off of the resonant switch in each resonant loop unit to control whether the corresponding resonant loop unit is turned on or not, thereby controlling the number of resonant loop units turned on according to the temperature information, and limiting the heating condition of the charging coil. It can be understood that Figure 3 The example of the resonant loop unit 132a and 132b provided with two resonant loop units is only an example of the number of resonant loop units provided by the embodiments of the present application. In actual application, different numbers of resonant loop units can be set according to the use scene, for example, three or more resonant loop units can also be set, and the number of resonant loop units is not limited in the embodiments of the present application.

[0027] Please combine Figure 3 In the present scheme, the temperature monitoring module 150 can be an NTC resistor, which is arranged within a preset range of the charging coil 140, and the main control chip 120 obtains the temperature information of the charging coil 140 through the NTC resistor. The preset range can be determined according to the actual use scene, for example, within a range of 5 cm around the charging coil, so that the NTC resistor in the range can conveniently reflect the temperature information of the charging coil 140, and the main control chip 120 can obtain relatively accurate temperature information of the charging coil 140 accordingly.

[0028] In the present scheme, the charging conversion unit 131 includes a step-down converter 1311 and an inverter 1312, the step-down converter 1311 is electrically connected to the inverter 1312, and the inverter 1312 is electrically connected to the charging coil 140. Among them, the PWM channel of the main control chip 120 is connected to the inverter 1311, and the main control chip 120 is connected to the step-down converter 1311 through a communication bus. The main control chip 120 provides a PWM signal to the inverter 1312 to control the output power of the inverter 1312. At the same time, by adjusting the frequency and amplitude of the PWM signal, the output frequency and output voltage of the inverter 1312 can be controlled, and then the frequency and strength of the alternating magnetic field generated by the charging coil 140 can be controlled.

[0029] Among them, the main control chip 120 can be connected with the step-down converter 1311 through the I2C bus, the I2C bus provides a reliable data communication mode between the main control chip 120 and the step-down converter 1311, which can transmit control commands and feedback information, and the main control chip 120 sends configuration parameters to the step-down converter 1311 through the I2C bus, to ensure that the step-down converter 1311 can provide a direct current signal meeting the parameters to the inverter 1312. In addition, through the I2C bus, the main control chip 120 can also detect whether the first step-down converter 131 or the second step-down converter 141 has faults such as overheating, overloading or short circuit, and take protective measures immediately. It can be seen that the main control chip 120 can dynamically adjust the electrical signal output by the step-down converter 1311 through the I2C bus connection, so as to adapt to different charging scenes and load conditions according to the actual demand of the mobile phone.

[0030] Please combine Figure 3The power supply module 110 includes a connector 111 connected to the power supply and the voltage reduction converter 1311, which provides the power supply with power to provide direct current power supply for the voltage reduction converter 1311, and then provides alternating current power supply for the charging coil 140 in combination with the resonant loop unit. In some embodiments, the power supply module 110 further includes a low dropout linear regulator 113 and a power converter 112, wherein the power converter 112 is connected to the connector 111 and the low dropout linear regulator 113, and the low dropout linear regulator 113 is connected to the master control chip 120 to provide direct current power supply for the master control chip 120. In the embodiments of the present application, the power converter 112 can convert the voltage provided by the connector 111 into a suitable power supply voltage for the master control chip 120, such as 3.3V voltage; the low dropout linear regulator 113 can maintain the stability of the voltage and provide filtering effect to meet the requirements of various electronic devices for power supply quality.

[0031] In some embodiments, referring to Figure 2 The wireless charging system 100 further includes a communication module 160 connected to the power supply module 110 and the master control chip 120. Among them, please refer to Figure 3 The communication module 160 includes a CAN chip and a CAN bus, and the CAN chip is connected to the master control chip 120 through the CAN bus to provide a communication protocol for the master control chip 120 to communicate with external lines. Using CAN protocol to communicate with the outside can enhance the compatibility and expansibility of the system, and ensure the stability and efficiency of data transmission.

[0032] In some embodiments, referring to Figure 2 The wireless charging system 100 further includes an NFC module 170 electrically connected to the power supply module 110 and communicatively connected to the master control chip 120. Among them, please refer to Figure 3The NFC module 170 includes an NFC chip 171 and an NFC antenna 172, which are communicatively connected, and the NFC chip 171 is electrically connected with the master control chip 120. The NFC module 170 enables the wireless charging system to perform close-range wireless communication with NFC-enabled devices, such as quick pairing, data transmission, or identity verification, etc., greatly improving the convenience and security of user experience. At the same time, the application of NFC technology also brings more diversified application scenarios and broader market prospects for the wireless charging system. It can be understood that the NFC antenna 172 serves as a medium for wireless communication, enabling data transmission and communication between the connected mobile phone. The NFC antenna 172 can identify the NFC chip in the mobile phone, ensuring communication between the wireless charging system 100 and the mobile phone, and the wireless charging system 100 can simplify the pairing and connection process with the mobile phone through the NFC antenna 172, quickly establishing a connection. It can be seen that the NFC antenna 172 not only provides a convenient wireless communication method, but also enhances the security of the charging process and optimizes the user experience.

[0033] In summary, the embodiment of the present application acquires the temperature information of the charging coil 140 in real time by setting the master control chip 120 in combination with the temperature monitoring module 150, and controls the working frequency of the variable frequency charging module 130 according to the temperature information, specifically controls the number of conduction of the resonant loop unit, reduces the heat dissipation of the charging coil 140 without changing the output power of the charging coil 140. Thus, a relatively high working frequency is maintained when the temperature is relatively low, and a relatively low working frequency is adjusted when the temperature is relatively high, to alleviate the heating of the charging coil 140 and optimize the charging efficiency of the wireless charging system.

[0034] It should be noted that the specification and drawings of the present application provide a preferred embodiment of the present application, but the present application can be implemented in many different forms, and is not limited to the embodiments described in the specification. These embodiments are not additional limitations on the content of the present application, and the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive. Furthermore, the above technical features continue to be combined with each other, forming various embodiments not listed above, which are considered to be within the scope of the present application. Furthermore, for those skilled in the art, the above description can be improved or changed, and all these improvements and changes should be within the scope of the appended claims of the present application.

Claims

1. A wireless charging system, characterized by, The power supply module, the main control chip, the temperature monitoring module, the variable frequency charging module and the charging coil are included. The power supply module is electrically connected with the main control chip, the temperature monitoring module and the variable frequency charging module to provide direct current power supply. The main control chip is used to acquire temperature information of the charging coil through the temperature monitoring module and control the working frequency of the variable frequency charging module according to the temperature information, so that the variable frequency charging module provides charging services with different power for the powered device through the charging coil.

2. The wireless charging system of claim 1, wherein, The variable frequency charging module includes a charging conversion unit and at least two resonance loop units. The main control chip is used to control the number of turned-on resonance loop units according to the temperature information. The charging conversion unit is used to provide alternating current power supply to the charging coil in combination with the turned-on resonance loop units to provide charging services for the powered device.

3. The wireless charging system of claim 2, wherein, The charging conversion unit includes a buck converter and an inverter. The main control chip is connected with the inverter through a PWM channel, and is connected with the buck converter through a communication bus.

4. The wireless charging system of claim 2, wherein, The resonance loop unit includes a resonance switch and a resonance capacitor.

5. The wireless charging system of claim 3, wherein, The power supply module includes a connector connected with a power supply and the buck converter.

6. The wireless charging system of claim 5, wherein, The power supply module further includes a low dropout linear regulator and a power converter.

7. The wireless charging system of claim 1, wherein, The temperature monitoring module includes an NTC resistor arranged in a preset range of the charging coil.

8. The wireless charging system of claim 1, wherein, The system further includes a communication module including a CAN chip and a CAN bus.

9. The wireless charging system of claim 1, wherein, The system further comprises an NFC module, the NFC module comprising an NFC chip and an NFC antenna, the NFC chip and the NFC antenna being communicatively connected, the NFC chip being electrically connected with the master chip.

10. An electronic device, comprising: A wireless charging system comprising the wireless charging system according to any one of claims 1-9.

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