Wireless power supply method, wireless power supply device and wireless power supply system

Abstract

The embodiment of the invention relates to the technical field of wireless power supply, and discloses a wireless power supply method, which comprises the following steps: acquiring a sampling current value of a transmitting resonance circuit; judging whether the sampling current value is equal to a preset current value; if the sampling current value is not equal to the preset current value, current control parameters are adjusted; and controlling the alternating current output by the inverter circuit according to the adjusted current control parameter, so that the sampling current value reaches a preset current value. According to the scheme, the wireless power supply device can wirelessly supply power to mobile equipment, a dynamic device, a static device and the like under the condition of real-time position change in real time, and the wireless power supply device can control the current in the transmitting resonance circuit; therefore, the current in the transmitting resonance circuit of the wireless power supply device can be adjusted according to the requirements of the powered equipment or different application scenes, the power supply efficiency of the wireless power supply device is controlled, and the applicability of the wireless power supply device is improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of wireless power supply technology, and in particular, to a wireless power supply method, a wireless power supply device, and a wireless power supply system. Background Art

[0002] With the continuous development of science and technology, charging safety issues are receiving more and more attention in daily life and industry. By using wireless power supply technology, the use of wired charging devices can be reduced, thereby avoiding possible safety hazards and improving the safety protection of oneself and equipment. In people's daily lives, the life scenarios for wireless charging are becoming more and more complex. For example, in scenarios where the power-consuming equipment is in motion, or in scenarios where the power-consuming equipment is at a large distance from the wireless power supply device, etc.

[0003] Currently available wireless power supply devices have the problem of fixed position and poor anti-drift, and perform poorly in dynamic use environments such as long distance and large drift. Therefore, ordinary point-to-point or static wireless power supply devices cannot be used in dynamic devices. In addition, currently available wireless power supply devices cannot adjust their power supply efficiency according to the power supply requirements of different mobile devices or different usage scenarios.

[0004] Application Contents

[0005] The embodiment of the present application mainly provides a wireless power supply method for realizing power supply to a mobile device according to its power supply demand in a dynamic usage scenario.

[0006] To solve the above technical problems, the embodiments of the present application adopt the following technical solutions:

[0007] In a first aspect, an embodiment of the present application provides a wireless power supply method, which is applied to a wireless power supply device, wherein the wireless power supply device includes an inverter circuit, a transmitting resonant circuit, and a current collection circuit;

[0008] The inverter circuit is configured to be connected to the mains;

[0009] The inverter circuit is configured to convert the mains power into alternating current and provide the alternating current to the transmitting resonant circuit;

[0010] The transmitting resonant circuit is configured to generate an alternating magnetic field according to the alternating current, so that the receiving resonant circuit in the mobile device generates a current in the alternating magnetic field;

[0011] The current acquisition circuit is configured to acquire in real time the current value of the alternating current output by the inverter circuit and the current value of the alternating current in the transmitting resonant circuit;

[0012] Wireless power delivery methods include:

[0013] Obtaining a sampled current value of a transmitting resonant circuit;

[0014] Determine whether the sampled current value is equal to the preset current value;

[0015] If the sampled current value is not equal to the preset current value, the current control parameter is adjusted;

[0016] The alternating current output by the inverter circuit is controlled according to the adjusted current control parameter so that the sampled current value reaches a preset current value.

[0017] In some embodiments, the current control parameter is a phase difference of the PWM signal.

[0018] In some embodiments, if the sampled current value is not equal to the preset current value, the current control parameter is adjusted, including:

[0019] If the sampled current value is greater than the preset current value, the phase difference is reduced so that the sampled current value drops to the preset current value.

[0020] In some embodiments, if the sampled current value is not equal to the preset current value, the current control parameter is adjusted, including:

[0021] If the sampled current value is less than the preset current value, the phase difference is increased so that the sampled current value increases to the preset current value.

[0022] In a second aspect, an embodiment of the present application provides a wireless power supply device, including a transmitting resonant circuit, an inverter circuit, a current collection circuit and a controller;

[0023] The first end of the inverter circuit is connected to the mains, and the second end of the inverter circuit is respectively connected to the first end of the transmitting resonant circuit and the first end of the current collection circuit;

[0024] The second end of the current collection circuit is connected to the second end of the transmitting resonant circuit, and the third end of the current collection circuit is connected to the first end of the controller;

[0025] A controller, wherein a second terminal of the controller is connected to a third terminal of the inverter circuit;

[0026] Wherein, the controller is configured to execute the wireless power supply method as any one of the first aspects.

[0027] In some embodiments, the transmit resonant circuit includes a transmit compensation network and a transmit coil;

[0028] The first end of the transmitting compensation network is connected to the second end of the inverter circuit, the second end of the transmitting compensation network is connected to the first end of the transmitting coil, and the second end of the transmitting coil is connected to the current collection circuit.

[0029] In some embodiments, the inverter circuit includes a high frequency inverter and an inverter driver;

[0030] The first end of the inverter driver is connected to the second end of the controller, and the second end of the inverter driver is connected to the first end of the high-frequency inverter;

[0031] The second end of the high frequency inverter is connected to the mains, and the third end of the high frequency inverter is respectively connected to the first end of the transmission compensation network and the first end of the current acquisition circuit.

[0032] In some embodiments, the current acquisition circuit includes a first current acquisition circuit;

[0033] The first current acquisition circuit includes a first current sensor, a first rectifier circuit, a first voltage conversion circuit and a first filter circuit:

[0034] A first end of the first current sensor is connected to the second end of the transmitting coil, and a second end of the first current sensor is connected to the first end of the first rectifier circuit;

[0035] The second end of the first rectifier circuit is connected to the first end of the first voltage conversion circuit, and the third end of the first rectifier circuit is connected to the second end of the first voltage conversion circuit;

[0036] A first end of the first voltage conversion circuit is connected to a first end of the first filtering circuit, and a second end of the first voltage conversion circuit is connected to a second end of the first filtering circuit;

[0037] The second end of the first filter circuit is grounded, and the third end of the first filter circuit is connected to the first end of the controller.

[0038] In some embodiments, the current acquisition circuit further includes a second current acquisition circuit;

[0039] The second current acquisition circuit includes a second current sensor, a second rectification circuit, a second voltage conversion circuit and a second filtering circuit;

[0040] A first end of the second current sensor is connected to the third end of the high-frequency inverter, and a second end of the second current sensor is connected to the second end of the second rectifier circuit;

[0041] The second end of the second rectifier circuit is connected to the first end of the second voltage conversion circuit, and the third end of the second rectifier circuit is connected to the second end of the second voltage conversion circuit;

[0042] A first end of the second voltage conversion circuit is connected to a first end of the second filter circuit, and a second end of the second voltage conversion circuit is grounded and connected to a second end of the second filter circuit;

[0043] The second end of the second filter circuit is grounded, and the third end of the second filter circuit is connected to the first end of the controller.

[0044] In some embodiments, the wireless power supply device further includes a third filtering circuit;

[0045] A first end of the third filter circuit is connected to the mains, and a second end of the third filter circuit is connected to the first end of the inverter circuit.

[0046] In a third aspect, an embodiment of the present application provides a wireless power supply system, including:

[0047] A mobile device and a wireless power supply device as described in any one of the second aspects.

[0048] Beneficial effects of the embodiments of the present application: Different from the prior art, the embodiments of the present application provide a wireless power supply method, which is applied to a wireless power supply device, and the wireless power supply device includes an inverter circuit, a transmitting resonant circuit and a current acquisition circuit; the inverter circuit is configured to be connected to the mains; the inverter circuit is configured to convert the mains into alternating current and provide the alternating current to the transmitting resonant circuit; the transmitting resonant circuit is configured to generate an alternating magnetic field according to the alternating current, so that the receiving resonant circuit in the mobile device generates a current in the alternating magnetic field; the current acquisition circuit is configured to collect the alternating current output by the inverter circuit and the alternating current in the transmitting resonant circuit in real time; the method includes: obtaining a sampled current value of the transmitting resonant circuit; judging whether the sampled current value is equal to a preset current value; if the sampled current value is not equal to the preset current value, adjusting the current control parameter; and controlling the alternating current output by the inverter circuit according to the adjusted current control parameter so that the sampled current value reaches the preset current value. The above scheme not only enables the wireless power supply device to wirelessly power mobile devices, dynamic devices, static devices, etc. in real-time under real-time position changes, but also enables the wireless power supply device to control the current in the transmitting resonant circuit, thereby adjusting the current in the transmitting resonant circuit of the wireless power supply device according to the needs of the powered device or different usage scenarios, controlling the power supply efficiency of the wireless power supply device, and improving the applicability of the wireless power supply device. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0050] Figure 1 It is a structural schematic diagram of a wireless power supply device provided in an embodiment of the present application;

[0051] Figure 2 It is a flow chart of a wireless power supply method provided in an embodiment of the present application;

[0052] Figure 3 is a structural schematic diagram of a wireless power supply device provided in an embodiment of the present application;

[0053] Figure 4It is a partial structural schematic diagram of a wireless power supply device provided in an embodiment of the present application;

[0054] Figure 5 It is a partial circuit schematic diagram of a wireless power supply device provided in an embodiment of the present application;

[0055] Figure 6 It is a partial circuit schematic diagram of a wireless power supply device provided in an embodiment of the present application;

[0056] Figure 7 It is a partial structural schematic diagram of a wireless power supply device provided in an embodiment of the present application;

[0057] Figure 8 It is a partial structural schematic diagram of a wireless power supply device provided in an embodiment of the present application;

[0058] Fig. 9 It is a structural schematic diagram of a wireless power supply system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0059] The present application is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present application, but do not limit the present application in any form. It should be noted that, for those of ordinary skill in the art, several variations and improvements can also be made without departing from the concept of the present application. These all belong to the protection scope of the present application.

[0060] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0061] It should be noted that, if there is no conflict, the various features in the embodiments of the present application can be combined with each other, all within the scope of protection of the present application. In addition, although the functional module division is performed in the device schematic diagram and the logical order is shown in the flow chart, in some cases, the steps shown or described can be performed in a sequence different from the module division in the device or the flow chart. In addition, the words "first", "second", "third", etc. used herein do not limit the data and execution order, but only distinguish the same items or similar items with basically the same functions and effects.

[0062] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in this specification and in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0063] In addition, the technical features involved in each embodiment of the present application described below can be combined with each other as long as they do not conflict with each other.

[0064] With the continuous development of science and technology, wireless power technology is being used in more and more scenarios in people's lives. Wireless power transfer (WPT) is a technology that allows electrical energy to be transmitted wirelessly from the transmitter to the receiver without physical connection. This technology uses electromagnetic fields as a medium to achieve wireless energy transmission through electromagnetic induction, magnetic resonance or radio frequency (RF).

[0065] In some embodiments, see Figure 1 , the wireless power supply device 100 includes a transmitting end 110 and a receiving end 120. The transmitting end 110 includes an inverter 111 and a transmitting coil 112. The inverter 111 converts the connected direct current into high-frequency alternating current to drive the transmitting coil 112. The transmitting coil 112 generates a corresponding alternating magnetic field according to the high-frequency alternating current output by the inverter 111, and wirelessly transmits energy to the receiving end 120. The receiving end 120 includes a receiving coil 121, a rectifier circuit 122 and a load 123. The receiving coil 121 generates a corresponding induced current according to the alternating magnetic field generated by the transmitting coil 112, and converts the above-mentioned induced current into a direct current through the rectifier circuit 122, and provides it to the load 123 for powering it.

[0066] In order to better understand the wireless power supply method in the embodiment of the present application, before introducing the wireless power supply method, a brief introduction is first given to the working process of the wireless power supply device applying the wireless power supply method.

[0067] The wireless power supply device includes an inverter circuit, a transmitting resonant circuit and a current collection circuit. The inverter circuit is configured to be connected to the mains, convert the connected mains into alternating current, and provide the alternating current to the transmitting resonant circuit; the transmitting resonant circuit generates a corresponding alternating magnetic field according to the received alternating current; the receiving resonant circuit in the mobile device generates an induced current through the alternating magnetic field, thereby realizing the mobile device being powered by the wireless power supply device.

[0068] Most of the existing wireless power supply devices use a point-to-point method for wireless power supply, and the existing wireless power supply devices are static wireless power supply devices. The above wireless power supply devices have problems such as fixed position and poor anti-deviation. Therefore, the above wireless power supply devices cannot provide wireless power supply to mobile devices, dynamic devices, static devices, etc. in real time when the position changes in real time. In addition, the existing wireless power supply devices cannot control the current in the transmitting resonant circuit according to the specific usage scenario and usage requirements, and adjust the power supply efficiency of the wireless power supply device, so its applicability is low.

[0069] In view of this, the present application embodiment provides a wireless power supply method applied to a wireless power supply device, see Figure 2 , Figure 2 It is a flowchart of a wireless power supply method applied to a wireless power supply device provided in some embodiments of the present application.

[0070] like Figure 2 As shown, the method S100 may specifically include the following steps:

[0071] S110: Obtain a sampled current value of the transmitting resonant circuit.

[0072] As can be seen from the foregoing, the transmitting resonant circuit is a resonant circuit located at the transmitting end of the wireless power supply, which generates a corresponding alternating magnetic field according to the received alternating current. In some embodiments, the transmitting resonant circuit includes components for generating an alternating magnetic field, such as an oscillator and a transmitting coil. In some other embodiments, the transmitting resonant circuit also includes other components for improving the efficiency of wireless power supply, such as a resonant coil or a compensation network.

[0073] The sampling current value is the current value of the alternating current in the transmitting resonant circuit collected by the current collection circuit. The current sampling circuit samples the current value of the alternating current in the transmitting resonant circuit in real time, and the current value obtained by sampling is the sampling current value. The sampling circuit transmits the collected sampling current value to the controller, so that the controller controls and adjusts the alternating current in the transmitting resonant circuit.

[0074] The current value of the alternating current in the transmitting resonant circuit is directly related to the strength of the generated alternating magnetic field. The larger the current value of the alternating current, the stronger the alternating magnetic field generated by the transmitting resonant circuit, thereby making the power supply efficiency of the wireless power supply device higher. However, excessive alternating current will lead to increased power loss because the resistance in the transmitting resonant circuit will consume more energy. Therefore, current sampling of the alternating current in the transmitting resonant circuit according to the current sampling circuit can help the controller effectively monitor the alternating current in the transmitting resonant circuit and improve the power supply efficiency of the wireless power supply device.

[0075] S120: Determine whether the sampled current value is equal to a preset current value.

[0076] According to different usage scenarios or different power supply requirements, a current value, i.e., a preset current value, can be preset. In some embodiments, the wireless power supply device further includes an interactive device, wherein the user can adjust the preset current value through the interactive device to adapt to the actual power supply requirements of the mobile device. In some other embodiments, the wireless power supply device further includes a corresponding application, and the user can adjust the preset current value through the application.

[0077] The controller determines the magnitude relationship between the sampled current value transmitted by the current sampling circuit and the preset current value. If the sampled current value is not equal to the preset current value, the controller controls and adjusts the sampled current value to reach the preset current value; if the sampled current value is equal to the preset current value, the sampled current value is not adjusted.

[0078] The controller controls the current value in the transmitting resonant circuit to reach the preset current value by judging the magnitude relationship between the received sampled current value and the preset current value. That is, the controller can power mobile devices with different power supply requirements through the preset current value, thereby improving the applicability of the wireless power supply device.

[0079] S130: If the sampled current value is not equal to the preset current value, the current control parameter is adjusted; and the alternating current output by the inverter circuit is controlled according to the adjusted current control parameter so that the sampled current value reaches the preset current value.

[0080] The current control parameter is a parameter that can be adjusted by the controller to control the current in the transmitting resonant circuit, that is, when the sampled current value is not equal to the preset current value, the controller controls the current value of the AC in the transmitting resonant circuit by adjusting the current control parameter, so that the current value collected by the current sampling circuit changes, that is, the sampled current value changes, and the controller controls the sampled current value to reach the preset current value. For example, if the sampled current value is greater than the preset current value, the controller adjusts the current control parameter accordingly so that the sampled current value drops to the preset current value; if the sampled current value is less than the preset current value, the controller adjusts the current control parameter accordingly so that the sampled current value rises to the preset current value.

[0081] When the sampled current value is not equal to the preset current value, the controller precisely regulates the current sampled value by controlling the current control parameter, so that the sampled current value can quickly and accurately reach the preset current value. This enables the wireless power supply device to supply power to the mobile device according to its different power supply requirements, thus improving the applicability of the wireless power supply device.

[0082] In some embodiments, the current control parameter is a phase difference of the PWM signal.

[0083] PWM signal, namely pulse width modulation (Pulse Width Modulation) signal, is a commonly used signal modulation technology, which transmits information by adjusting the width of the pulse. The phase difference of the PWM signal refers to the time difference between two or more PWM signals within a PWM signal cycle, which reflects the relative position of these signals on the time axis. The controller can adjust the phase difference of the PWM signal by moving the step length, and the moving step length is the adjustment amount of the PWM signal phase. The controller adjusts the phase difference of the PWM signal by adjusting the phase of the PWM signal. It can be seen from the above content that the inverter circuit is connected to the transmitting resonant circuit to provide the required alternating current for the transmitting resonant circuit. The circuit acquisition circuit collects the current value of the alternating current in the transmitting resonant circuit in real time as the sampling current value, and sends the sampling current value to the controller. The controller adjusts the sampling current value according to the preset current value to reach the preset current value.

[0084] If the sampled current value is greater than the preset current value, the controller will adjust the phase difference of the PWM signal accordingly so that the sampled current value drops to the preset current value; if the sampled current value is less than the preset current value, the controller will adjust the phase difference of the PWM signal accordingly so that the sampled current value rises to the preset current value.

[0085] In some embodiments, the above step of “if the sampled current value is not equal to the preset current value, adjusting the current control parameter” specifically includes:

[0086] S131: If the sampled current value is greater than the preset current value, the phase difference is reduced so that the sampled current value drops to the preset current value.

[0087] The controller can adjust the current value in the transmitting resonant circuit by adjusting the phase difference of the PWM signal, that is, adjusting the sampled current value to reach a preset current value. If the sampled current is greater than the preset current value, the controller will correspondingly reduce the phase difference of the PWM signal, thereby reducing the current value of the output AC power of the inverter circuit to reduce the current value of the AC power in the transmitting resonant circuit, that is, reducing the sampled current value to a preset current value. For example, if the sampled current value is greater than the preset current value, the controller will reduce the phase step of the PWM signal, that is, reduce the phase difference of the PWM signal, and the sampled current value will decrease.

[0088] S132: If the sampled current value is less than the preset current value, increase the phase difference so that the sampled current value increases to the preset current value.

[0089] The controller can adjust the current value in the transmitting resonant circuit by adjusting the phase difference of the PWM signal, that is, adjust the sampled current value to reach the preset current value. If the sampled current is less than the preset current value, the controller will increase the phase difference of the PWM signal accordingly, thereby increasing the current value of the output AC power of the inverter circuit to increase the current value of the AC power in the transmitting resonant circuit, that is, increase the sampled current value to the preset current value. For example, if the sampled current value is less than the preset current value, the controller will increase the phase step of the PWM signal, that is, increase the phase difference of the PWM signal, and the sampled current value will increase.

[0090] In some embodiments, it can be understood that after the user sets the predetermined current value, the controller adjusts the phase difference of the PWM signal by the step size according to the size relationship between the sampled current value collected by the current acquisition circuit and the predetermined current value set by the user, thereby controlling the sampled current value to reach the predetermined current value.

[0091] The process of adjusting the sampling current value by the controller is divided into two time periods, namely the first time period and the second time period, wherein the first time period is a fast adjustment time period, i.e., the time period in which the adjustment starts after the user sets the preset current value. In the first time period, the adjustment amount of the PWM signal phase difference is large, i.e., the moving step is large, to help the sampling current value quickly approach the preset current value. The second time period is a precise adjustment time period, which is located after the first time period. In the second time period, since the sampling current value fluctuates near the preset current value after adjustment in the first time period, the moving step of the PWM signal is small, to help the sampling current value accurately reach the preset current value.

[0092] In some further embodiments, after receiving the sampled current value, the controller calculates the difference between the sampled current value and the preset current value according to the preset current value, and sets the first threshold interval and the second threshold interval accordingly.

[0093] If the difference between the sampled current value and the preset current value falls within the first threshold interval, it is considered that the difference between the sampled current value and the preset current value is small, so the controller adjusts the PWM signal through a smaller moving step so that the sampled current value reaches the preset current value; if the difference between the sampled current value and the preset current value falls within the second threshold interval, it is considered that the difference between the sampled current value and the preset current value is large, so the controller adjusts the PWM signal through a larger moving step so that the sampled current value reaches the preset current value.

[0094] If the difference between the sampled current value and the preset current value is less than the minimum value of the first threshold interval, it is considered that the sampled current value and the preset current value differ very little, so the controller adjusts the PWM signal through the minimum moving step so that the sampled current value reaches the preset current value; if the difference between the sampled current value and the preset current value is greater than the maximum value of the second threshold interval, it is considered that the sampled current value and the preset current value differ greatly, so the controller adjusts the PWM signal through the maximum moving step so that the sampled current value reaches the preset current value.

[0095] In some embodiments, before the step of “obtaining the sampled current value of the transmitting resonant circuit”, the controller initializes the sampled current value and the phase of the PWM signal.

[0096] The present application also provides a wireless power supply device 200, such as Figure 3 As shown, it includes a transmitting resonant circuit 10, an inverter circuit 20, a current acquisition circuit 30 and a controller 40. The first end of the inverter circuit 20 is connected to the mains 300, and the second end of the inverter circuit 20 is connected to the first end of the transmitting resonant circuit 10, so as to convert the mains 300 into alternating current through the inverter circuit 20, and transmit it to the transmitting resonant circuit 10, and the transmitting resonant circuit 10 generates a corresponding alternating magnetic field according to the received alternating current; the first end of the current acquisition circuit 30 is connected to the second end of the inverter circuit 20, the second end of the current acquisition circuit 30 is connected to the second end of the transmitting resonant circuit 10, and the third end of the current acquisition circuit 30 is connected to the first end of the controller 40, so as to collect the sampled current value output by the inverter circuit 20, collect the second sampled current value in the transmitting resonant circuit 10, and send it to the controller 40; the second end of the controller 40 is connected to the third end of the inverter circuit 20, and the controller 40 adjusts the phase difference of the PWM signal by the step size according to the received sampled current value, the second sampled current value and the preset current value set by the user, so as to control the alternating current output by the inverter circuit 20, adjust the alternating current in the transmitting resonant circuit 10, and thus control the sampled current value to reach the preset current value.

[0097] See also Figure 4 The transmitting resonant circuit 10 includes a transmitting compensation network 11 and a transmitting coil 12. The first end of the transmitting compensation network 11 is connected to the second end of the inverter circuit 20, the second end of the transmitting compensation network 11 is connected to the first end of the transmitting coil 12, and the second end of the transmitting coil 12 is connected to the current acquisition circuit 30. The inverter circuit 20 converts the connected mains power 300 into alternating current, and transmits the alternating current to the transmitting compensation network 11. The transmitting compensation network 11 transmits the received alternating current to the transmitting coil 12 to generate a corresponding alternating magnetic field. The transmitting compensation network 11 adjusts the reactance of the transmitting coil 12 to match the reactance of the receiving coil in the mobile device, thereby improving the power supply efficiency of the wireless power supply device.

[0098] Please refer again Figure 4 , the inverter circuit 20 includes a high-frequency inverter 21 and an inverter driver 22. Among them, the first end of the inverter driver 22 is connected to the second end of the controller 40, and the second end of the inverter driver 22 is connected to the first end of the high-frequency inverter 21; the second end of the high-frequency inverter 21 is connected to the mains 300, and the third end of the high-frequency inverter 21 is respectively connected to the first end of the transmission compensation network 11 and the first end of the current acquisition circuit 30. The inverter driver 22 drives the inverter to convert the connected mains 300 into alternating current, and transmits it to the transmission compensation network 11. The controller 40 controls the alternating current generated by the high-frequency inverter 21 by controlling the inverter driver 22. The high-frequency inverter 21 is connected to the controller 40 through the inverter driver 22, so that the controller 40 can control the alternating current output by the high-frequency inverter 21 by controlling the inverter driver 22, so that the wireless power supply device 200 can control the alternating current output by the high-frequency inverter 21 according to the power supply demand of the mobile device, thereby improving the applicability of the wireless power supply device 200.

[0099] See also Figure 5 and Figure 6 , the current acquisition circuit 30 includes a first current acquisition circuit 31. The first current acquisition circuit 31 includes a first current sensor 31a, a first rectifier circuit 31b, a first voltage conversion circuit 31c and a first filter circuit 31d. The first end of the first current sensor 31a is connected to the second end of the transmitting coil 12, and the second end of the first current sensor 31a is connected to the first end of the first rectifier circuit 31b; the second end of the first rectifier circuit 31b is connected to the first end of the first voltage conversion circuit 31c, and the third end of the first rectifier circuit 31b is connected to the second end of the first voltage conversion circuit 31c; the first end of the first voltage conversion circuit 31c is connected to the first end of the first filter circuit 31d, and the second end of the first voltage conversion circuit 31c is connected to the second end of the first filter circuit 31d; the third end of the first filter circuit 31d is connected to the first end of the controller 40, and the second end of the first filter circuit 31d is grounded.

[0100] The first current sensor 31a samples the current value of the alternating current passing through the transmitting coil 12 by electromagnetic induction, and sends the collected sampled current value to the first voltage conversion circuit 31c after passing through the first rectifier circuit 31b. The first voltage conversion circuit 31c converts the received current value into a corresponding voltage value, and sends it to the controller 40 after filtering through the first filter circuit 31d. After the controller 40 converts the received voltage value into a sampled current value, it adjusts the phase difference of the PWM signal by moving the step size based on the collected sampled current value and the pre-set preset current value, so that the sampled current value reaches the preset current value.

[0101] The current acquisition circuit 30 also includes a second current acquisition circuit 32. The second current acquisition circuit 32 includes a second current sensor 32a, a second rectifier circuit 32b, a second voltage conversion circuit 32c, and a second filter circuit 32d. The first end of the second current sensor 32a is connected to the third end of the high-frequency inverter 21, and the second end of the second current sensor 32a is connected to the second end of the second rectifier circuit 32b; the second end of the second rectifier circuit 32b is connected to the first end of the second voltage conversion circuit 32c, and the third end of the second rectifier circuit 32b is connected to the second end of the second voltage conversion circuit 32c; the first end of the second voltage conversion circuit 32c is connected to the first end of the second filter circuit 32d, and the second end of the second voltage conversion circuit 32c is connected to the second end of the second filter circuit 32d; the third end of the second filter circuit 32d is connected to the first end of the controller 40, and the second end of the second filter circuit 32d is grounded.

[0102] The second current sensor 32a collects the current value of the alternating current output by the high-frequency inverter 22 through electromagnetic induction, and sends the collected second sampled current value to the second voltage conversion circuit 32c after passing through the second rectifier circuit 32b. The second voltage conversion circuit 32c converts the received current value into a corresponding voltage value, and sends it to the controller 40 after filtering through the second filter circuit 32d. After the controller 40 converts the received voltage value into a second sampled current value, the controller 40 obtains feedback after the phase difference of the PWM signal is changed through the second sampled current value.

[0103] The current acquisition circuit 30 transmits the collected sampled current value and the second sampled current value to the controller 40. The controller 40 adjusts the phase difference of the high-frequency inverter 21 according to the sampled current value and the preset current value, and obtains feedback of the adjusted phase difference of the high-frequency inverter 21 according to the second sampled current value. Therefore, the controller 40 can make the sampled current value accurately reach the preset current value; at the same time, the controller 40 can also obtain feedback of the output of alternating current by the high-frequency inverter 21 after the PWM signal phase difference is adjusted according to the second sampled current value, and timely perceive the abnormality of the output of alternating current by the high-frequency inverter 21, thereby improving the safety of the wireless power supply device 200.

[0104] See also Figure 3 and 7, the wireless power supply device 200 also includes a power supply circuit 50 and a third filter circuit 60. The first end of the power supply circuit 50 is connected to the internal power supply, the second end of the power supply circuit 50 is connected to the inverter driver 22, and the third end of the power supply circuit 50 is connected to the controller 40 to power the inverter driver 22 and the controller 40. In some embodiments, the power supply circuit 50 includes a voltage converter 51, which converts the input external voltage into the voltage required by the components and supplies power to the above components. The first end of the third filter circuit 60 is connected to the mains 300, and the second end of the third filter circuit 60 is connected to the second end of the high-frequency inverter 21.

[0105] Please refer again Figure 5 and Figure 6 The first voltage conversion circuit 31c includes a first resistor 31c1, a second resistor 31c2, a third resistor 31c3 and a first voltage regulator diode 31c4 connected in parallel. The first end of the first resistor 31c1 is connected to the second end of the first rectifier circuit 31b and the first end of the second resistor 31c2 respectively, and the second end of the first resistor 31c1 is connected to the third end of the first rectifier circuit 31b and the second end of the second resistor 31c2 respectively; the first end of the second resistor 31c2 is connected to the first end of the third resistor 31c3, and the second end of the second resistor 31c2 is connected to the second end of the third resistor 31c3; the first end of the third resistor 31c3 is connected to the first end of the first voltage regulator diode 31c4, and the second end of the third resistor 31c3 is connected to the second end of the first voltage regulator diode 31c4; the first end of the first voltage regulator diode 31c4 is connected to the first end of the first filter circuit 31d, and the second end of the first voltage regulator diode 31c4 is connected to the second end of the first filter circuit 31d. The first resistor 31c1, the second resistor 31c2 and the third resistor 31c3 connected in parallel convert the sampled current value output by the first rectifier circuit 31b into a voltage value, which is transmitted to the controller 40 after passing through the first voltage zener diode 31c4 and the first filter circuit 31d. When the input voltage exceeds the breakdown voltage of the first voltage zener diode 31c4, the first voltage zener diode 31c4 will be turned on and limit the further increase of the voltage to protect the circuit from overvoltage damage.

[0106] The second voltage conversion circuit 32c includes a fourth resistor 32c1, a fifth resistor 32c2, a sixth resistor 32c3 and a second voltage stabilizing diode 31c4 connected in parallel. The first end of the fourth resistor 32c1 is respectively connected to the second end of the second rectifier circuit 32b and the first end of the fifth resistor 32c2, and the second end of the fourth resistor 32c1 is respectively connected to the third end of the second rectifier circuit 32b and the second end of the fifth resistor 32c2; the first end of the fifth resistor 32c2 is connected to the first end of the sixth resistor 32c3, and the second end of the fifth resistor 32c2 is connected to the second end of the sixth resistor 32c3; the first end of the sixth resistor 32c3 is connected to the first end of the second voltage stabilizing diode 32c4, and the second end of the sixth resistor 32c3 is connected to the second end of the second voltage stabilizing diode 32c4; the first end of the second voltage stabilizing diode 32c4 is connected to the first end of the second filter circuit 32d, and the second end of the second voltage stabilizing diode 32c4 is connected to the second end of the second filter circuit 32d. The fourth resistor 32c1, the fifth resistor 32c2 and the sixth resistor 32c3 connected in parallel convert the second sampling current value output by the second rectifier circuit 32b into a voltage value, which is transmitted to the controller 40 after passing through the second voltage zener diode 31c4 and the second filter circuit 32d. When the input voltage exceeds the breakdown voltage of the second voltage zener diode 31c4, the second voltage zener diode 31c4 will be turned on and limit the further increase of the voltage to protect the circuit from overvoltage damage.

[0107] The first filter circuit 31d includes a first capacitor 31d1 and a seventh resistor 31d2, wherein a first end of the seventh resistor 31d2 is connected to a first end of the third resistor 31c3, a second end of the seventh resistor 31d2 is connected to a first end of the first capacitor 31d1, a first end of the first capacitor 31d1 is connected to a first end of the controller 40, and a second end of the first capacitor 31d1 is grounded. The second filter circuit 32d includes a second capacitor 32d1 and an eighth resistor 32d2, wherein a first end of the eighth resistor 32d2 is connected to a first end of the sixth resistor 32c3, a second end of the eighth resistor 32d2 is connected to a first end of the second capacitor 32d1, and a second end of the second capacitor 32d1 is grounded.

[0108] See also Figure 8 The wireless power supply device 200 further includes a protection circuit 70, which includes a first protection circuit 71 and a second protection circuit 72. The first end of the first protection circuit 71 is connected to the second end of the first current sensor 31a, and the second end of the second protection circuit 71 is connected to the first end of the transmitting coil 12. The first current sensor 31a collects the current value of the alternating current input to the transmitting coil 12 according to electromagnetic induction, that is, the sampling current value, and transmits the sampling current value to the first protection circuit 71.

[0109] The first protection circuit 71 controls the conduction and disconnection of the signal between the inverter driver 22 and the high-frequency inverter 21 according to the received sampling current value. For example, if the sampling current value is greater than or equal to the current protection threshold of the first protection circuit 71, it is considered that the sampling current value is too large and may easily cause damage to the components in the circuit, so the first protection circuit 71 controls the inverter driver 22 to disconnect the output of the drive signal to the high-frequency inverter 21; if the sampling current value is less than the current protection threshold of the first protection circuit 71, it is considered that the sampling current value is within the normal range and will not cause damage to the components in the circuit, so the first protection circuit 71 controls the inverter driver 22 to continue to output the drive signal to the high-frequency inverter 21.

[0110] The first end of the first protection circuit 71 is connected to the second end of the first current sensor 31a, and the second end of the second protection circuit 72 is connected to the first end of the inverter driver 22. The first current sensor 31a collects the current value of the AC power output by the high-frequency inverter 21 according to electromagnetic induction, that is, the second sampled current value, and transmits the second sampled current value to the first protection circuit 71.

[0111] The second protection circuit 72 controls the conduction and disconnection of the signal between the inverter driver 22 and the high-frequency inverter 21 according to the received second sampling current value. For example, if the second sampling current value is greater than or equal to the current protection threshold of the second protection circuit 72, it is considered that the second sampling current value is too large and may easily cause damage to the components in the circuit, so the second protection circuit 72 controls the inverter driver 22 to disconnect the output of the drive signal to the high-frequency inverter 21; if the second sampling current value is less than the current protection threshold of the second protection circuit 72, it is considered that the second sampling current value is in a normal range and will not cause damage to the components in the circuit, so the second protection circuit 72 controls the inverter driver 22 to continue to output the drive signal to the high-frequency inverter 21.

[0112] The protection circuit 70 controls the drive signal output by the inverter driver 22 according to the input sampling current value and the second sampling current value. When the sampling current value or the second sampling current value is greater than the current protection threshold of the protection circuit, that is, when the sampling current value or the second sampling current value has the risk of damaging the components in the circuit, the inverter driver 22 can be quickly cut off from outputting the drive signal to the high-frequency inverter 21, thereby improving the safety of the wireless power supply device 200.

[0113] The present application also provides a wireless power supply system 500. Fig. 9As shown, it includes a mobile device 400 and a wireless power supply device 200. The wireless power supply device 200 includes a plurality of transmitting resonant circuits 10, which are respectively arranged on the moving route of the mobile device 400, so that the alternating magnetic field generated by the transmitting resonant circuit 10 can cover the moving range of the mobile device 400. The mobile device 400 includes a receiving resonant circuit 410, a rectifying circuit 420, a DC conversion circuit 430 and a receiving control circuit 440. Among them, the first end of the receiving resonant circuit 410 is connected to the first end of the rectifying circuit 420, the second end of the rectifying circuit 420 is connected to the first end of the DC conversion circuit 430, and the second end of the DC conversion circuit 430 is connected to the receiving control circuit 440.

[0114] Among them, the receiving resonant circuit 410 includes a receiving compensation network 411 and a receiving coil 412, the first end of the receiving compensation network 411 is connected to the receiving coil 412, the second end of the receiving compensation network 411 is connected to the first end of the rectifier circuit 420, the transmitting coil 12 generates an induced current through an alternating magnetic field, and transmits the induced current to the receiving compensation network 411, the receiving compensation network 411 transmits the received induced current to the DC conversion circuit 430 via the rectifier circuit 420, the DC conversion circuit 430 converts the received induced current into DC power, and outputs it to the receiving control circuit 440 to provide stable DC power for the mobile device 400.

[0115] In summary, this solution samples the current value of the alternating current input to the transmitting coil in real time by setting a second current acquisition circuit, obtains the sampled current value, and transmits the sampled current value to the controller. The controller adjusts the phase difference of the PWM signal input to the inverter driver according to the sampled current value and the preset current value set by the user, thereby controlling the current value of the alternating current output by the high-frequency inverter, so that the sampled current value reaches the preset current value, and the wireless power supply device can wirelessly power the mobile device according to its power supply needs. In addition, this solution sets multiple transmitting resonant circuits on the moving route of the mobile device, so that the alternating magnetic field generated by them can cover the moving range of the mobile device, so that the wireless power supply device can wirelessly power the mobile device that moves in real time in a dynamic environment.

[0116] It should be noted that the device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0117] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Under the concept of the present application, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes in different aspects of the present application as described above, which are not provided in detail for the sake of simplicity. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features can be replaced by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A wireless power supply method, applied to a wireless power supply device, characterized in that: The wireless power supply device comprises an inverter circuit, a transmitting resonant circuit and a current collection circuit; The inverter circuit is configured to be connected to the mains; The inverter circuit is configured to convert the commercial power into alternating current and provide the alternating current to the transmitting resonant circuit; The transmitting resonant circuit is configured to generate an alternating magnetic field according to the alternating current, so that the receiving resonant circuit in the mobile device generates a current in the alternating magnetic field; The current acquisition circuit is configured to acquire the current value of the alternating current output by the inverter circuit and the current value of the alternating current in the transmitting resonant circuit in real time; The method comprises: Obtaining a sampled current value of the transmitting resonant circuit; Determining whether the sampled current value is equal to a preset current value; If the sampled current value is not equal to the preset current value, adjusting the current control parameter; The alternating current output by the inverter circuit is controlled according to the adjusted current control parameter so that the sampled current value reaches the preset current value.

2. The method according to claim 1, characterized in that The current control parameter is the phase difference of the PWM signal.

3. The method according to claim 2, characterized in that If the sampled current value is not equal to the preset current value, adjusting the current control parameter includes: If the sampled current value is greater than the preset current value, the phase difference is reduced so that the sampled current value drops to the preset current value.

4. The method according to claim 2, characterized in that: If the sampled current value is not equal to the preset current value, adjusting the current control parameter includes: If the sampled current value is less than the preset current value, the phase difference is increased so that the sampled current value increases to the preset current value.

5. A wireless power supply device, characterized in that: It includes a transmitting resonant circuit, an inverter circuit, a current collection circuit and a controller; The first end of the inverter circuit is connected to the mains, and the second end of the inverter circuit is respectively connected to the first end of the transmitting resonant circuit and the first end of the current collection circuit; The second end of the current collection circuit is connected to the second end of the transmitting resonant circuit, and the third end of the current collection circuit is connected to the first end of the controller; A controller, wherein a second terminal of the controller is connected to a third terminal of the inverter circuit; Wherein, the controller is configured to execute the wireless power supply method as described in any one of claims 1-5.

6. The wireless power supply device according to claim 5, characterized in that: The transmitting resonant circuit includes a transmitting compensation network and a transmitting coil; The first end of the transmitting compensation network is connected to the second end of the inverter circuit, the second end of the transmitting compensation network is connected to the first end of the transmitting coil, and the second end of the transmitting coil is connected to the current acquisition circuit.

7. The wireless power supply device according to claim 6, characterized in that: The inverter circuit includes a high-frequency inverter and an inverter driver; The first end of the inverter driver is connected to the second end of the controller, and the second end of the inverter driver is connected to the first end of the high-frequency inverter; The second end of the high-frequency inverter is connected to the mains, and the third end of the high-frequency inverter is respectively connected to the first end of the transmission compensation network and the first end of the current acquisition circuit.

8. The wireless power supply device according to claim 7, characterized in that: The current collection circuit includes a first current collection circuit; The first current acquisition circuit includes a first current sensor, a first rectifier circuit, a first voltage conversion circuit and a first filter circuit: A first end of the first current sensor is connected to a second end of the transmitting coil, and a second end of the first current sensor is connected to a first end of the first rectifier circuit; The second end of the first rectifier circuit is connected to the first end of the first voltage conversion circuit, and the third end of the first rectifier circuit is connected to the second end of the first voltage conversion circuit; A first end of the first voltage conversion circuit is connected to a first end of the first filter circuit, and a second end of the first voltage conversion circuit is connected to a second end of the first filter circuit; The second end of the first filter circuit is grounded, and the third end of the first filter circuit is connected to the first end of the controller.

9. The wireless power supply device according to claim 8, characterized in that: The current collection circuit also includes a second current collection circuit; The second current acquisition circuit includes a second current sensor, a second rectifier circuit, a second voltage conversion circuit and a second filter circuit; The first end of the second current sensor is connected to the third end of the high-frequency inverter, and the second end of the second current sensor is connected to the second end of the second rectifier circuit; The second end of the second rectifier circuit is connected to the first end of the second voltage conversion circuit, and the third end of the second rectifier circuit is connected to the second end of the voltage conversion circuit; A first end of the second voltage conversion circuit is connected to a first end of the second filtering circuit, and a second end of the second voltage conversion circuit is connected to a second end of the second filtering circuit; A second terminal of the second filtering circuit is grounded, and a third terminal of the second filtering circuit is connected to a first terminal of the controller.

10. The wireless power supply device according to claims 5-9, characterized in that: The current conversion circuit also includes a third filtering circuit; A first end of the third filter circuit is connected to the AC power, and a second end of the third filter circuit is connected to a first end of the inverter circuit.

11. A wireless power supply system, characterized in that: include: A mobile device and a wireless power supply device as claimed in any one of claims 5 to 10.

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