Wireless charging device

Abstract

The embodiment of the utility model relates to the technical field of wireless charging, and discloses a wireless charging device, which comprises a power supply module, a control chip, a first charging module and a second charging module, the power supply module is electrically connected with the control chip, the first charging module and the second charging module so as to provide direct current signals. And the control chip is in communication connection with the first charging module and the second charging module and is used for respectively controlling the first charging module and the second charging module to convert the direct-current electric signal into an alternating-current electric signal so as to provide charging service for the mobile terminal. According to the wireless charging device, the function of charging a plurality of mobile terminals can be achieved under the condition that one control chip is used, the production cost of the wireless charging device is effectively reduced, and resources are saved.

Description

TECHNICAL FIELD

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

[0002] The wireless charging device, also known as a wireless charging system, is a technology that can charge a device without a physical connection cable through electromagnetic induction or resonance principle. In today's rapid development of science and technology, wireless charging devices are mostly used in the field of electric vehicles, and the vehicle-mounted system generally charges a mobile phone with a wireless charging device. With the passage of time, the demand of users for the vehicle-mounted high-power dual-charging wireless charging device increases.

[0003] However, most of the existing high-power dual-charging wireless charging devices contain two control chips, so that the production cost of the high-power dual-charging wireless charging device is high. SUMMARY

[0004] The technical problem solved by the embodiment of the present application is how to reduce the production cost of the high-power multi-charging wireless charging device.

[0005] To solve the above technical problem, the embodiment of the present application adopts the following technical scheme:

[0006] In a first aspect, the embodiment of the present application provides a wireless charging device, comprising: a power supply module, a control chip, a first charging module and a second charging module; the power supply module is electrically connected to the control chip, the first charging module and the second charging module respectively to provide a direct current signal; the control chip is communicatively connected to the first charging module and the second charging module, and is used to control the first charging module and the second charging module to convert the direct current signal into an alternating current signal respectively, so as to provide charging service for a mobile terminal.

[0007] In some embodiments, the first charging module comprises a first buck converter, a first inverter and a first transmitting coil, the first buck converter is electrically connected to the power supply module and the first inverter, and the first inverter is electrically connected to the first transmitting coil; the PWM channel of the control chip is connected to the first inverter, and the control chip is connected to the first buck converter through a communication bus.

[0008] In some embodiments, the second charging module comprises a second buck converter, a second inverter and a second transmitting coil, the second buck converter is electrically connected to the power supply module and the second inverter, and the second inverter is electrically connected to the second transmitting coil; the PWM channel of the control chip is connected to the second inverter, and the control chip is connected to the second buck converter through a communication bus.

[0009] In some embodiments, the power supply module comprises a connector, the connector connects a power supply and the first buck converter, or the connector connects the power supply and the second buck converter.

[0010] In some embodiments, the power supply module further comprises a low dropout linear regulator connected to the control chip to provide a direct current signal for the control chip.

[0011] In some embodiments, the power supply module further comprises a third step-down converter electrically connected to the connector, the first charging module and the second charging module respectively.

[0012] In some embodiments, the wireless charging device further comprises a communication module connected to the power supply module and the control chip respectively.

[0013] In some embodiments, the communication module comprises a CAN chip and a CAN bus, and the CAN chip is connected to the control chip through the CAN bus.

[0014] In some embodiments, the wireless charging device further comprises an NFC module electrically connected to the power supply module and communicatively connected to the control chip.

[0015] In some embodiments, the NFC module comprises an NFC chip and an NFC antenna, and the NFC chip and the NFC antenna are communicatively connected.

[0016] The wireless charging device provided by the embodiments of the present application is different from the prior art, and comprises a power supply module, a control chip, a first charging module and a second charging module. The power supply module is electrically connected to the control chip, the first charging module and the second charging module to provide a direct current signal. The control chip is communicatively connected to the first charging module and the second charging module to control the first charging module and the second charging module to convert the direct current signal into an alternating current signal to provide charging service for a mobile terminal. The wireless charging device can realize the charging function of multiple mobile terminals using a single control chip, effectively reduce the production cost of the wireless charging device and save resources. BRIEF DESCRIPTION OF DRAWINGS

[0017] One or more embodiments are illustrated by way of example in the drawings that are not intended to be limiting of the embodiments so that one of ordinary skill in the art will understand that not all of the drawings are to scale, that the drawings are illustrated using a cartoon style with the intent of providing conceptual descriptions of aspects of the application, and that, where appropriate, identical reference numerals have been used in different drawings to denote like elements.

[0018] Figure 1 is a structural schematic diagram of a wireless charging device provided by the embodiments of the present application;

[0019] Figure 2 is a circuit diagram of a wireless charging device provided by the embodiments of the present application. DETAILED DESCRIPTION

[0020] The application will be described in detail below with specific embodiments. The following examples will help those skilled in the art to further understand the application, but do not limit the application in any form. It should be noted that for those skilled in the art, without departing from the concept of the application, a number of modifications and improvements can be made. These are within the scope of protection of the application.

[0021] In order to make the purpose, technical scheme and advantages of the application more clear, the application will be further described in detail below in combination with the drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the application and do not limit the application.

[0022] It should be noted that the features in the embodiments of the application can be combined with each other without conflict, and are within the scope of protection of the application. In addition, although the functional modules are divided in the device schematic diagram, and the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in a different order from the module division in the device or the order in the flowchart. In addition, the "first", "second", "third" and the like used herein do not limit the data and execution order, but only distinguish the same items or similar items with basically the same function and effect.

[0023] 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 application belongs. The terms used in the specification of the application are only for the purpose of describing the specific embodiments and are not used to limit the application. The term "and / or" used in the specification includes any and all combinations of one or more related listed items.

[0024] In addition, the technical features involved in each embodiment of the application described below can be combined with each other as long as there is no conflict.

[0025] With the continuous development of science and technology, wireless charging devices are applied in many fields, such as household appliances, medical equipment and electric vehicles. Among them, the demand for vehicle-mounted wireless charging devices is increasing, and most users currently have multiple mobile terminals, so the demand for high-power vehicle-mounted dual-charging wireless charging devices is increasing, but most of the existing vehicle-mounted dual-charging wireless charging devices realize the function of supplying power to multiple mobile terminals through two control chips, so that the production cost of the existing vehicle-mounted dual-charging wireless charging devices is high.

[0026] Therefore, the wireless charging device provided in the embodiments of the present application, please refer to Figure 1 The wireless charging device 100 includes a power supply module 110, a control chip 120, a first charging module 130 and a second charging module 140.

[0027] The power supply module 110 is electrically connected to the control chip 120, the first charging module 130 and the second charging module 140 respectively, and provides direct current signals for the above modules. The control chip 120 is communicatively connected to the first charging module 130 and the second charging module 140, and controls the first charging module 130 and the second charging module 140 to convert the received direct current signals into required alternating current signals, thereby realizing the function of charging the mobile terminal 200.

[0028] Referring to Figure 2 The first charging module 130 includes a first voltage reduction converter 131, a first inverter 132 and a first transmitting coil 133. The first inverter 132 is electrically connected to the power supply module 110 and the first inverter 132, and the first inverter 132 is electrically connected to the first transmitting coil 133. The first transmitting coil 133 is also used to connect with the mobile terminal 200, and the mobile terminal 200 includes a receiving coil 210. The first voltage reduction converter 131 receives the direct current signals provided by the power supply module 110, and performs voltage reduction operation to obtain voltage-reduced direct current signals, which are transmitted to the first inverter 132. The first inverter 132 converts the received voltage-reduced direct current signals into alternating current signals, and sends the obtained alternating current signals to the first transmitting coil 133. The first transmitting coil 133 generates an alternating magnetic field according to the connected alternating current signals.

[0029] The second charging module 140 includes a second voltage reduction converter 141, a second inverter 142 and a second transmitting coil 143. The second inverter 142 is electrically connected to the power supply module 110 and the second inverter 142, and the second inverter 142 is electrically connected to the second transmitting coil 143. The second transmitting coil 143 is also used to connect with the mobile terminal 200, and the mobile terminal 200 includes a receiving coil 210. The second voltage reduction converter 141 receives the direct current signals provided by the power supply module 110, and performs voltage reduction operation to obtain voltage-reduced direct current signals, which are transmitted to the second inverter 142. The second inverter 142 converts the received voltage-reduced direct current signals into alternating current signals, and sends the obtained alternating current signals to the second transmitting coil 143. The second transmitting coil 143 generates an alternating magnetic field according to the connected alternating current signals.

[0030] When the AC signal passes through the first transmitting coil 133 or the second transmitting coil 143, a magnetic field is formed around the first transmitting coil 133 or the second transmitting coil 143 according to Ampere's Law. The AC signal causes the magnetic field to change constantly, and the constantly changing magnetic field is the medium for the transmission of electrical energy in the wireless charging device. On this basis, when the alternating magnetic field passes through the receiving coil 210, an alternating voltage is induced in the receiving coil 210 according to Faraday's Law of Electromagnetic Induction. The alternating voltage in the receiving coil 210 is rectified and stabilized, and then converted into a stable DC signal for use by the mobile terminal 200.

[0031] The electromagnetic induction principle not only enables relatively efficient energy transmission, especially over short distances, but also provides a stable charging method that reduces fluctuations and interference during the charging process. Moreover, the components of the electromagnetic induction principle are relatively simple, making them easy to manufacture and assemble, and reducing the overall cost of the wireless charging device 100. In addition, due to the versatility and flexibility of the electromagnetic induction principle, the wireless charging device 100 using electromagnetic induction can be compatible with a variety of devices.

[0032] The PWM channel of the control chip 120 is connected with the first inverter 132, and the control chip 120 is connected with the first voltage reducer 131 through a communication bus. The PWM channel of the control chip 120 is connected with the second inverter 142, and the control chip 120 is connected with the second voltage reducer 141 through a communication bus. The first inverter 132 or the second inverter 142 is usually composed of four switching elements, which can be transistors, insulated gate bipolar transistors, field effect transistors or other types of switching devices. By alternately switching the on and off states of the above-mentioned switching elements, the first inverter 132 or the second inverter 142 can generate an alternating voltage across the load, thereby realizing the conversion of a direct current signal to an alternating current signal. The control chip 120 sends the generated PWM signal to the first inverter 132 or the second inverter 142, and the PWM signal is sent to the drive circuit of the first inverter 132 or the second inverter 142. The drive circuit controls the switching action of the switching elements according to the level state of the PWM signal, realizes the control of the control chip 120 on the on and off time of each switching element in the first inverter 132 or the second inverter 142, and controls the output power of the first inverter 132 or the second inverter 142. The longer the on time of the switching element, the greater the output power of the first inverter 132 or the second inverter 142, and the shorter the on time of the switching element, the smaller the output power of the first inverter 132 or the second inverter 142. At the same time, by adjusting the frequency and amplitude of the PWM signal, the output frequency and output voltage of the first inverter 132 or the second inverter 142 can be controlled, so as to control the frequency and intensity of the alternating magnetic field generated by the first transmitting coil 133 or the second transmitting coil 143.

[0033] The control chip 120 controls the first inverter 132 or the second inverter 142 through the PWM signal, and the wireless charging device 100 can realize fine control of the charging process, including adjusting the output power, frequency and waveform to adapt to different charging requirements and system conditions. This control method enables the wireless charging device 100 to provide efficient and safe wireless energy transmission.

[0034] It can be understood that the number of PWM channels available inside the control chip 120 is determined by the hardware design of the control chip 120. The control chip 120 usually has a fixed number of timers and counters, which are used to generate PWM signals, and the operation of each PWM channel will generate a certain power consumption. Too many PWM channels may cause the power consumption of the control chip 120 to be too high, affecting the performance and thermal management of the control chip 120. Therefore, the number of PWM channels of the control chip 120 is limited.

[0035] Based on the above, the control chip 120 is connected with the first voltage reducing converter 131 or the second voltage reducing converter 141 through the I2C bus, the I2C bus provides a reliable data communication mode between the control chip 120 and the first voltage reducing converter 131 or the second voltage reducing converter 141, which is used for transmitting control commands and feedback information, the controller sends configuration parameters to the first voltage reducing converter 131 or the second voltage reducing converter 141 through the I2C bus, so as to ensure that the first voltage reducing converter 131 can provide the first inverter 132 with a direct current signal meeting the parameters, or the second voltage reducing converter 141 can provide the second inverter 142 with a direct current signal meeting the parameters. In addition, through the I2C bus, the control chip 120 can also detect whether the first voltage reducing converter 131 or the second voltage reducing converter 141 has faults such as overheating, overload or short circuit, and take protective measures. It can be seen that the control chip 120 can dynamically adjust the direct current signal output by the first voltage reducing converter 131 or the second voltage reducing converter 141 according to the actual demand of the mobile terminal 200 through the I2C bus connection with the first voltage reducing converter 131, so as to adapt to different charging scenes and load conditions.

[0036] The control chip 120 is connected with the first voltage reducing converter 131 or the second voltage reducing converter 141 through the I2C bus, which can realize accurate control of the direct current signal required by the first transmitting coil 133 or the second transmitting coil 143 of the wireless charging device 100. At the same time, when detecting that the output direct current signal is abnormal, the control chip 120 can control the converter to be closed, so as to protect the circuit and the equipment, and improve the reliability, safety and user experience of the system. This connection mode also enables the wireless charging device 100 to more accurately adapt to different charging demands and conditions, and ensures the safety and efficiency of the charging process.

[0037] Please refer to Figure 2 The power supply module 110 includes a connector 111, a low dropout linear regulator 112 and a third voltage reducing converter 113. The connector 111 is connected with a power supply and the first voltage reducing converter 131, or the connector 111 is connected with a power supply and the second voltage reducing converter 141. The connector 111 sends a direct current signal to the first voltage reducing converter 131, or the connector 111 sends a direct current signal to the second voltage reducing converter 141. The first voltage reducing converter 131 performs a voltage reducing operation on the received direct current signal according to the communication with the control chip 120, so as to obtain a direct current signal required by the first inverter 132; or the connector 111 sends a direct current signal to the second voltage reducing converter 141, and the second voltage reducing converter 141 performs a voltage reducing operation on the received direct current signal according to the communication with the control chip 120, so as to obtain a direct current signal required by the second inverter 142.

[0038] The low-dropout linear regulator 112 is connected to the control chip 120 to provide the required DC signal for the control chip 120. The third step-down converter 113 is respectively connected to the connector 111, the first charging module 130 and the second charging module 140. The third step-down converter 113 performs step-down processing on the DC signal sent by the connector 111, and provides the obtained DC signal to the first charging module 130 and the second charging module 140 to provide the required DC signal.

[0039] Please refer to Figure 2 The wireless charging device further comprises a communication module 150 connected to the power supply module 110 and the control chip 120. The communication module 150 comprises a CAN chip 151 and a CAN bus 152, and the CAN chip 151 is connected to the control chip 120 through the CAN bus 152. The power supply module 110 provides the required power signal for the CAN chip 151, and the CAN chip 151 is connected to the control chip 120 to provide the corresponding communication protocol for the communication between the control chip 120 and the external circuit. Using the CAN protocol for external communication brings higher communication efficiency, better system compatibility and expandability, stronger security and maintenance convenience to the wireless charging device 100, which helps to improve the overall performance and user experience of the wireless charging device 100.

[0040] Please refer to Figure 2 The wireless charging device further comprises an NFC module 160 connected to the power supply module 110 and the control chip 120. The NFC module 160 comprises an NFC chip 161 and an NFC antenna 162, and the NFC chip 161 is connected to the power supply module 110 and the NFC antenna 162, and is connected to the control chip 120 through an SPI bus. The NFC chip 161 provides a convenient and secure wireless communication method for the control chip 120, which is used for data exchange and control between devices, and the NFC chip 161 can also realize functions such as identity recognition, data transmission and pairing connection.

[0041] It can be understood that the NFC antenna 162 serves as a medium for wireless communication to realize data transmission and communication with the connected mobile terminal 200. The NFC antenna 162 can identify the NFC chip in the mobile terminal 200 to ensure communication between the wireless charging device 100 and the mobile terminal 200, and the wireless charging device 100 can simplify the pairing and connection process with the mobile terminal 200 through the NFC antenna 162 to quickly establish a connection. It can be seen that the NFC antenna 162 not only provides a convenient wireless communication method, but also enhances the security and user experience of the charging process.

[0042] Please refer to Figure 2The mobile terminal 200 can be connected with the first transmitting coil 133 or the second transmitting coil 143, the mobile terminal 200 comprises a receiving coil 210, the first transmitting coil 133 or the second transmitting coil 143 communicates with the receiving coil 210 through FSK (frequency shift keying) and ASK (amplitude shift keying), the mobile terminal 200 reads the key stored in the control chip 120 and performs the private wireless charging protocol identity verification, returns the verified private wireless charging protocol to the control chip 120, and the control chip 120 adjusts the output power of the first charging module 130 or the second charging module 140 according to the received private wireless charging protocol. For example, if the charging power required by the mobile terminal 200 itself is 50W, the maximum charging power of the wireless charging device 100 is 15W, and the private wireless charging protocol identity verification of the mobile terminal 200 is passed, the wireless charging device 100 supplies power according to the power required by the mobile terminal 200 itself, that is, the power supply power is 50W; if the charging power required by the mobile terminal 200 itself is 50W, and the private wireless charging protocol identity verification of the mobile terminal 200 is not passed, the wireless charging device 100 supplies power using the maximum charging power of the small power charging, that is, the power supply power is 15W.

[0043] The power supply module 110 comprises a connector 111, a low dropout linear regulator 112 and a third step-down converter 113, the connector 111 is electrically connected with the CAN chip 151, the first step-down converter 131, the second step-down converter 141 and the third step-down converter 113, to provide a direct current signal. The CAN chip 151 is connected with the control chip 120 through the CAN bus 152, to provide a communication protocol for the control chip 120 to communicate with external lines; the first step-down converter 131 is connected with the control chip 120 through the I 2C bus communication and connected with the first inverter 132 through the PWM channel, and the second step-down converter 141 is connected with the control chip 120 through the I 2C bus communication and connected with the second inverter 142 through the PWM channel. The control chip 120 controls the first step-down converter 131 to obtain the required direct current signal by step-down operation of the direct current signal from the connector 111 according to the received identity-verified private wireless charging protocol, and sends the required direct current signal to the first inverter 132, the first inverter 132 converts the received required direct current signal into an alternating current signal, and sends the obtained alternating current signal to the first transmitting coil 133, the first transmitting coil 133 generates an alternating magnetic field according to the received alternating current signal, generates an induced current through the electromagnetic induction principle, and realizes the charging function of the mobile terminal 200 connected with the first transmitting coil 133.

[0044] Similarly, the control chip 120 controls the second step-down converter 141 to obtain the required direct current signal by step-down operation of the direct current signal from the connector 111 according to the received identity-verified private wireless charging protocol, and sends the required direct current signal to the second inverter 142, and the second inverter 142 converts the received required direct current signal into an alternating current signal, and sends the obtained alternating current signal to the second transmitting coil 143, and the second transmitting coil 143 generates an alternating magnetic field according to the received alternating current signal, generates an induced current through the principle of electromagnetic induction, and realizes the charging function of the mobile terminal 200 connected to the second transmitting coil 143. Wherein, the control chip 120 has multiple sets of private keys stored in it through software partitioning, which are used for the mobile terminal 200 to read and perform identity verification of the private wireless charging protocol. In addition, the NFC module 160 is connected to the control chip 120, and is used for identity recognition and data communication of the connected mobile terminal 200.

[0045] In summary, the utility model discloses a single control chip 120, realizes that wireless charging device 100 carries out power supply to multiple mobile terminals 200, and the control chip 120 has multiple sets of private keys stored in it through software partitioning, which are used for the mobile terminal 200 connected to the transmitting coil to perform identity verification of the private wireless charging protocol. For the private wireless charging protocol that passes the verification, the control chip 120 controls the output power of the first inverter 132 or the second inverter 142 through PWM, realizing the control of the output power of the wireless charging device 100. Compared with using multiple control chips 120 to realize power supply to multiple mobile terminals 200, the utility model realizes this function through only one control chip 120, effectively reduces the production cost of the wireless charging device 100, and saves resources.

[0046] It should be noted that the apparatus embodiments described above are merely illustrative, wherein the units described as separate components can or can not be physically separated, and the components displayed as units can or can not be physical units, i.e., they can be located in one place, or distributed on multiple network units. According to actual needs, part or all of the modules can be selected to achieve the purpose of the embodiment scheme.

[0047] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, but not to limit them; under the idea of the present application, the technical features in the above examples or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes of different aspects of the present application as described above, which are not provided in details for simplicity; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A wireless charging device, characterized by, The power supply module, the control chip, the first charging module and the second charging module are connected with each other. The power supply module is electrically connected with the control chip, the first charging module and the second charging module to provide a direct current signal. The control chip is connected with the first charging module and the second charging module to control the first charging module and the second charging module to convert the direct current signal into an alternating current signal to provide charging service for the mobile terminal.

2. The wireless charging device of claim 1, wherein, The first charging module comprises a first step-down converter, a first inverter and a first transmitting coil, the first step-down converter is electrically connected with the first inverter, and the first inverter is electrically connected with the first transmitting coil. The PWM channel of the control chip is connected with the first inverter, and the control chip is connected with the first step-down converter through a communication bus.

3. The wireless charging device of claim 2, wherein, The second charging module comprises a second step-down converter, a second inverter and a second transmitting coil, the second step-down converter is electrically connected with the second inverter, and the second inverter is electrically connected with the second transmitting coil. The PWM channel of the control chip is connected with the second inverter, and the control chip is connected with the second step-down converter through a communication bus.

4. The wireless charging device of claim 3, wherein, The power supply module comprises a connector, the connector is connected with a power supply and the first step-down converter, or the connector is connected with a power supply and the second step-down converter.

5. The wireless charging device of claim 4, wherein, The power supply module further comprises a low-dropout linear regulator, the low-dropout linear regulator is connected with the control chip to provide the direct current signal for the control chip.

6. The wireless charging device of claim 5, wherein, The power supply module further comprises a third step-down converter, the third step-down converter is electrically connected with the connector, the first charging module and the second charging module.

7. The wireless charging device of claim 1, wherein, The wireless charging device further comprises a communication module, the communication module is connected with the power supply module and the control chip.

8. The wireless charging device of claim 7, wherein, The communication module comprises a CAN chip and a CAN bus, the CAN chip is connected with the control chip through the CAN bus.

9. The wireless charging device of claim 1, wherein, The wireless charging device further comprises an NFC module, the NFC module is electrically connected with the power supply module, and the NFC module is connected with the control chip.

10. The wireless charging device of claim 9, wherein, The NFC module comprises an NFC chip and an NFC antenna, and the NFC chip and the NFC antenna are connected with each other.

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