Wireless power feeding device and wireless power feeding system

Abstract

The embodiment of the present application relates to the wireless power supply technical field, discloses a kind of wireless power supply device, including transmitting resonant circuit, inverter circuit, current collection circuit and controller;The first end of inverter circuit is connected with commercial power, and the second end of inverter circuit is respectively connected with the first end of transmitting resonant circuit and the first end of current collection circuit;The second end of current collection circuit is connected with the second end of transmitting resonant circuit, and the third end of current collection circuit is connected with the first end of controller;Controller, the second end of controller is connected with the third end of inverter circuit.The above scheme not only enables wireless power supply device to be able to real-time to mobile equipment under dynamic scene carries out wireless power supply, also enables wireless power supply device to be able to control current in transmitting resonant circuit by controller and current collection circuit, to control the power supply efficiency of wireless power supply device, improve the applicability of wireless power supply device.

Description

Technical Field

[0001] This application relates to the field of wireless power supply technology, and in particular to a wireless power supply device and a wireless power supply system. Background Technology

[0002] With the continuous development of technology, charging safety has become increasingly important in daily life and industry. Using wireless power supply technology can reduce the use of wired charging devices, thereby avoiding potential safety hazards and improving the safety of oneself and equipment. Furthermore, the scenarios in which people need wireless charging are becoming increasingly complex, such as when electrical equipment is in motion or when there is a significant distance between the equipment and the wireless power supply device.

[0003] Current wireless power supply devices suffer from fixed locations and poor resistance to offset, resulting in poor performance in dynamic usage environments such as long distances and large offsets. Therefore, ordinary point-to-point or static wireless power supply devices cannot be used with dynamic devices. Furthermore, current wireless power supply devices cannot adjust their power supply efficiency according to the power needs of different mobile devices or different usage scenarios. Utility Model Content

[0004] The embodiments of this application mainly provide a wireless power supply device that can supply power to the mobile device according to its power supply needs in dynamic usage scenarios.

[0005] To solve the above-mentioned technical problems, the embodiments of this application adopt the following technical solutions:

[0006] In a first aspect, this application provides a wireless power supply device, including a transmitting resonant circuit, an inverter circuit, a current acquisition circuit, and a controller;

[0007] The first terminal of the inverter circuit is connected to the mains power, and the second terminal of the inverter circuit is connected to the first terminal of the transmitting resonant circuit and the first terminal of the current acquisition circuit, respectively.

[0008] The second terminal of the current acquisition circuit is connected to the second terminal of the transmitting resonant circuit, and the third terminal of the current acquisition circuit is connected to the first terminal of the controller.

[0009] The controller's second terminal is connected to the third terminal of the inverter circuit.

[0010] In some embodiments, the transmitting resonant circuit includes a transmitting compensation network and a transmitting coil;

[0011] The first end of the transmitter compensation network is connected to the second end of the inverter circuit, the second end of the transmitter compensation network is connected to the first end of the transmitter coil, and the second end of the transmitter coil is connected to the current acquisition circuit.

[0012] In some embodiments, the inverter circuit includes a high-frequency inverter and an inverter driver;

[0013] The first terminal of the inverter driver is connected to the second terminal of the controller, and the second terminal of the inverter driver is connected to the first terminal of the high-frequency inverter.

[0014] The second terminal of the high-frequency inverter is connected to the mains power, and the third terminal of the high-frequency inverter is connected to the first terminal of the transmitter compensation network and the first terminal of the current acquisition circuit, respectively.

[0015] In some embodiments, the current acquisition circuit includes a first current acquisition circuit;

[0016] The first current acquisition circuit includes a first current sensor, a first rectifier circuit, a first voltage conversion circuit, and a first filter circuit.

[0017] The first end of the first current sensor is connected to the second end of the transmitting coil, and the second end of the first current sensor is connected to the first end of the first rectifier circuit.

[0018] The second terminal of the first rectifier circuit is connected to the first terminal of the first voltage conversion circuit, and the third terminal of the first rectifier circuit is connected to the second terminal of the first voltage conversion circuit.

[0019] The first terminal of the first voltage conversion circuit is connected to the first terminal of the first filter circuit, and the second terminal of the first voltage conversion circuit is connected to the second terminal of the first filter circuit.

[0020] The second terminal of the first filter circuit is grounded, and the third terminal of the first filter circuit is connected to the first terminal of the controller.

[0021] In some embodiments, the current acquisition circuit further includes a second current acquisition circuit;

[0022] The second current acquisition circuit includes a second current sensor, a second rectifier circuit, a second voltage conversion circuit, and a second filter circuit.

[0023] 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.

[0024] The second terminal of the second rectifier circuit is connected to the first terminal of the second voltage conversion circuit, and the third terminal of the second rectifier circuit is connected to the second terminal of the second voltage conversion circuit.

[0025] The first terminal of the second voltage conversion circuit is connected to the first terminal of the second filter circuit, and the second terminal of the second voltage conversion circuit is connected to the second terminal of the second filter circuit.

[0026] The second terminal of the second filter circuit is grounded, and the third terminal of the second filter circuit is connected to the first terminal of the controller.

[0027] In some embodiments, the first voltage conversion circuit includes a first resistor, a second resistor, a third resistor, and a first Zener diode;

[0028] The first end of the first resistor is connected to the first end of the second resistor, and the second end of the first resistor is connected to the second end of the second resistor.

[0029] The first end of the second resistor is connected to the first end of the third resistor, and the second end of the second resistor is connected to the second end of the third resistor.

[0030] The first end of the third resistor is connected to the first end of the first Zener diode, and the second end of the third resistor is connected to the second end of the first Zener diode.

[0031] The first end of the first Zener diode is connected to the first end of the first filter circuit, and the second end of the first Zener diode is connected to the second end of the first filter circuit.

[0032] In some embodiments, the second voltage conversion circuit includes a fourth resistor, a fifth resistor, a sixth resistor, and a second Zener diode;

[0033] The first end of the fourth resistor is connected to the first end of the fifth resistor, and the second end of the fourth resistor is connected to the second end of the fifth resistor.

[0034] The first end of the fifth resistor is connected to the first end of the sixth resistor, and the second end of the fifth resistor is connected to the second end of the sixth resistor.

[0035] The first end of the sixth resistor is connected to the first end of the second Zener diode, and the second end of the sixth resistor is connected to the second end of the second Zener diode.

[0036] The first end of the second Zener diode is connected to the first end of the second filter circuit, and the second end of the second Zener diode is connected to the second end of the second filter circuit.

[0037] In some embodiments, the first filter circuit includes a seventh resistor and a first capacitor, and the second filter circuit includes an eighth resistor and a second capacitor.

[0038] The first end of the seventh resistor is connected to the first end of the third resistor, and the second end of the seventh resistor is connected to the first end of the first capacitor.

[0039] The first terminal of the first capacitor is connected to the first terminal of the controller, and the second terminal of the first capacitor is grounded.

[0040] The first end of the eighth resistor is connected to the first end of the sixth resistor, and the second end of the eighth resistor is connected to the first end of the second capacitor.

[0041] The first terminal of the second capacitor is connected to the first terminal of the controller, and the second terminal of the second capacitor is grounded.

[0042] In some embodiments, the wireless power supply device further includes a third filtering circuit;

[0043] The first terminal of the third filter circuit is connected to the mains power, and the second terminal of the third filter circuit is connected to the first terminal of the inverter circuit.

[0044] Secondly, embodiments of this application provide a wireless power supply system, including:

[0045] Mobile devices and wireless power supply devices as described in any of the first aspects.

[0046] The beneficial effects of this application's embodiments: Unlike existing technologies, this application provides a wireless power supply device including a transmitting resonant circuit, an inverter circuit, a current acquisition circuit, and a controller. The first terminal of the inverter circuit is connected to mains power, and the second terminal of the inverter circuit is connected to the first terminal of the transmitting resonant circuit. The first terminal of the current acquisition circuit is connected to the third terminal of the inverter circuit, the second terminal of the current acquisition circuit is connected to the second terminal of the transmitting resonant circuit, and the third terminal of the current acquisition circuit is connected to the first terminal of the controller. The second terminal of the controller is connected to the first terminal of the inverter circuit. This solution not only enables the wireless power supply device to provide real-time wireless power to mobile devices, dynamic devices, and static devices under real-time positional changes, but also allows the wireless power supply device to control the current in the transmitting resonant circuit through the controller and the current acquisition circuit. This allows the device to adjust the current in the transmitting resonant circuit 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 its applicability. Attached Figure Description

[0047] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0048] Figure 1 This is a schematic diagram of the structure of a wireless power supply device provided in an embodiment of this application;

[0049] Figure 2 This is a partial structural schematic diagram of a wireless power supply device provided in an embodiment of this application;

[0050] Figure 3 This is a partial circuit diagram of a wireless power supply device provided in an embodiment of this application;

[0051] Figure 4 This is a partial circuit diagram of a wireless power supply device provided in an embodiment of this application; Figure 5 This is a partial structural schematic diagram of a wireless power supply device provided in an embodiment of this application;

[0052] Figure 6 This is a partial structural schematic diagram of a wireless power supply device provided in an embodiment of this application;

[0053] Figure 7 This is a schematic diagram of a wireless power supply system provided in an embodiment of this application. Detailed Implementation

[0054] The present application will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present application, but do not limit the present application in any way. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present application. These all fall within the protection scope of the present application.

[0055] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0056] It should be noted that, unless there is a conflict, the various features in the embodiments of this application can be combined with each other, all of which are within the protection scope of this application. Furthermore, although functional modules are divided in the device schematic diagram and a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in a different order than the module division in the device or the order in the flowchart. In addition, the terms "first," "second," and "third" used herein do not limit the data or execution order, but only distinguish identical or similar items with essentially the same function and effect.

[0057] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0058] Furthermore, the technical features involved in the various embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0059] With the continuous development of technology, wireless power transfer technology is being applied in more and more scenarios in people's lives. Wireless Power Transfer (WPT) is a technology that allows electrical energy to be wirelessly transmitted from a transmitter to a receiver without a physical connection. This technology uses an electromagnetic field as a medium to achieve wireless energy transmission through electromagnetic induction, magnetic resonance, or radio frequency (RF).

[0060] Most existing wireless power supply devices use a point-to-point method for wireless power supply and are static devices, which suffer from fixed positions and resistance to displacement. Therefore, these devices cannot provide real-time wireless power to mobile devices, dynamic devices, or devices in static states where their positions change. Furthermore, existing wireless power supply devices cannot control the current in the transmitting resonant circuit according to specific usage scenarios and requirements, thus limiting their applicability.

[0061] In view of this, this application provides a wireless power supply device 200, please refer to... Figure 1 It includes a transmitting resonant circuit 10, an inverter circuit 20, a current acquisition circuit 30, and a controller 40. The first terminal of the inverter circuit 20 is connected to the mains power 300, and the second terminal of the inverter circuit 20 is connected to the first terminal of the transmitting resonant circuit 10. This is used to convert the mains power 300 into alternating current through the inverter circuit 20 and transmit it to the transmitting resonant circuit 10. The transmitting resonant circuit 10 generates a corresponding alternating magnetic field based on the received alternating current. The first terminal of the current acquisition circuit 30 is connected to the second terminal of the inverter circuit 20, and the second terminal of the current acquisition circuit 30 is connected to the second terminal of the transmitting resonant circuit 10. The third terminal of the current acquisition circuit 30 is connected to the first terminal of the controller 40. This is used to acquire the sampled current value output by the inverter circuit 20, acquire the second sampled current value in the transmitting resonant circuit 10, and send it to the controller 40. The second terminal of the controller 40 is connected to the third terminal of the inverter circuit 20. The controller 40 adjusts the phase difference of the PWM signal by step size based on the received sampled current value, the second sampled current value, and the preset current value set by the user. This is used to control the alternating current output by the inverter circuit 20 and adjust the alternating current in the transmitting resonant circuit 10, thereby controlling the sampled current value to reach the preset current value.

[0062] Please see Figure 2The 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, and the second end of the transmitting compensation network 11 is connected to the first end of the transmitting coil 12. The second end of the transmitting coil 12 is connected to the current acquisition circuit 30. The inverter circuit 20 converts the incoming mains power 300 into alternating current and transmits this 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 improves the power supply efficiency of the wireless power supply device by adjusting the reactance of the transmitting coil 12 to match the reactance of the receiving coil in the mobile device.

[0063] Please refer to it again. Figure 2 The inverter circuit 20 includes a high-frequency inverter 21 and an inverter driver 22. The first terminal of the inverter driver 22 is connected to the second terminal of the controller 40, and the second terminal of the inverter driver 22 is connected to the first terminal of the high-frequency inverter 21. The second terminal of the high-frequency inverter 21 is connected to the mains power 300, and the third terminal of the high-frequency inverter 21 is connected to the first terminal of the transmission compensation network 11 and the first terminal of the current acquisition circuit 30, respectively. The inverter driver 22 drives the inverter to convert the input mains power 300 into alternating current (AC) and transmit it to the transmission compensation network 11. The controller 40 controls the AC power generated by the high-frequency inverter 21 by controlling the inverter driver 22. The high-frequency inverter 21 is communicatively connected to the controller 40 through the inverter driver 22, enabling the controller 40 to control the AC power output of the high-frequency inverter 21 by controlling the inverter driver 22. This allows the wireless power supply device 200 to control the AC power output of the high-frequency inverter 21 according to the power supply needs of the mobile device, improving the applicability of the wireless power supply device 200.

[0064] Please see Figure 3 and Figure 4 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; 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; 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; 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.

[0065] The first current sensor 31a samples the current value of the alternating current passing through the transmitting coil 12 through electromagnetic induction, and sends the 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, filters it through the first filter circuit 31d, and sends it to the controller 40. The controller 40 converts the received voltage value into a sampled current value, and adjusts the phase difference of the PWM signal by moving the step size based on the sampled current value and the preset current value, so that the sampled current value reaches the preset current value.

[0066] The current acquisition circuit 30 further 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 terminal of the second current sensor 32a is connected to the third terminal of the high-frequency inverter 21, and the second terminal of the second current sensor 32a is connected to the second terminal of the second rectifier circuit 32b. The second terminal of the second rectifier circuit 32b is connected to the first terminal of the second voltage conversion circuit 32c, and the third terminal of the second rectifier circuit 32b is connected to the second terminal of the second voltage conversion circuit 32c. The first terminal of the second voltage conversion circuit 32c is connected to the first terminal of the second filter circuit 32d, and the second terminal of the second voltage conversion circuit 32c is connected to the second terminal of the second filter circuit 32d. The third terminal of the second filter circuit 32d is connected to the first terminal of the controller 40, and the second terminal of the second filter circuit 32d is grounded.

[0067] The second current sensor 32a collects the current value of the AC power 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 the corresponding voltage value, filters it through the second filter circuit 32d, and sends it to the controller 40. The controller 40 converts the received voltage value into the second sampled current value, and obtains feedback on the change in the phase difference of the PWM signal through the second sampled current value.

[0068] The current acquisition circuit 30 transmits the acquired sampling current value and the second sampling current value to the controller 40. The controller 40 adjusts the phase difference of the high-frequency inverter 21 according to the sampling current value and the preset current value, and obtains feedback on the phase difference adjustment of the high-frequency inverter 21 according to the second sampling current value. Therefore, the controller 40 can make the sampling current value accurately reach the preset current value. At the same time, the controller 40 can also obtain feedback on the AC output of the high-frequency inverter 21 after the PWM signal phase difference adjustment according to the second sampling current value, and promptly detect abnormalities in the AC output of the high-frequency inverter 21, thereby improving the safety of the wireless power supply device 200.

[0069] Please see Figure 1 and 5 The wireless power supply device 200 also includes a power supply circuit 50 and a third filter circuit 60. The first terminal of the power supply circuit 50 is connected to an internal power source, the second terminal is connected to an inverter driver 22, and the third terminal is connected to a 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 that converts the input external voltage into the voltage required by the components and powers them. The first terminal of the third filter circuit 60 is connected to the mains power 300, and the second terminal is connected to the second terminal of the high-frequency inverter 21.

[0070] Please refer to it again. Figure 3 and Figure 4 The first voltage conversion circuit 31c includes a first resistor 31c1, a second resistor 31c2, a third resistor 31c3, and a first Zener diode 31c4 connected in parallel. The first terminal of the first resistor 31c1 is connected to the second terminal of the first rectifier circuit 31b and the first terminal of the second resistor 31c2, respectively. The second terminal of the first resistor 31c1 is connected to the third terminal of the first rectifier circuit 31b and the second terminal of the second resistor 31c2, respectively. The first terminal of the second resistor 31c2 is connected to the first terminal of the third resistor 31c3, and the second terminal of the second resistor 31c2 is connected to the second terminal of the third resistor 31c3. The first terminal of the third resistor 31c3 is connected to the first terminal of the first Zener diode 31c4, and the second terminal of the third resistor 31c3 is connected to the second terminal of the first Zener diode 31c4. The first terminal of the first Zener diode 31c4 is connected to the first terminal of the first filter circuit 31d, and the second terminal of the first Zener diode 31c4 is connected to the second terminal of the first filter circuit 31d. The parallel resistors 31c1, 31c2, and 31c3 convert the sampled current value output from the first rectifier circuit 31b into a voltage value, which is then transmitted to the controller 40 after passing through the first Zener diode 31c4 and the first filter circuit 31d. When the input voltage exceeds the breakdown voltage of the first Zener diode 31c4, the first Zener diode 31c4 will conduct and limit the voltage increase further, thereby protecting the circuit from overvoltage damage.

[0071] The second voltage conversion circuit 32c includes a fourth resistor 32c1, a fifth resistor 32c2, a sixth resistor 32c3, and a second Zener diode 32c4 connected in parallel. The first terminal of the fourth resistor 32c1 is connected to the second terminal of the second rectifier circuit 32b and the first terminal of the fifth resistor 32c2. The second terminal of the fourth resistor 32c1 is connected to the third terminal of the second rectifier circuit 32b and the second terminal of the fifth resistor 32c2. The first terminal of the fifth resistor 32c2 is connected to the first terminal of the sixth resistor 32c3, and the second terminal of the fifth resistor 32c2 is connected to the second terminal of the sixth resistor 32c3. The first terminal of the sixth resistor 32c3 is connected to the first terminal of the second Zener diode 32c4, and the second terminal of the sixth resistor 32c3 is connected to the second terminal of the second Zener diode 32c4. The first terminal of the second Zener diode 32c4 is connected to the first terminal of the second filter circuit 32d, and the second terminal of the second Zener diode 32c4 is connected to the second terminal of the second filter circuit 32d. The parallel resistors 32c1, 32c2, and 32c3 convert the second sampled current value output from the second rectifier circuit 32b into a voltage value, which is then transmitted to the controller 40 after passing through the second Zener diode 31c4 and the second filter circuit 32d. When the input voltage exceeds the breakdown voltage of the second Zener diode 31c4, the second Zener diode 31c4 will conduct and limit the voltage increase further, thereby protecting the circuit from overvoltage damage.

[0072] The first filter circuit 31d includes a first capacitor 31d1 and a seventh resistor 31d2. The first terminal of the seventh resistor 31d2 is connected to the first terminal of the third resistor 31c3, and the second terminal of the seventh resistor 31d2 is connected to the first terminal of the first capacitor 31d1. The first terminal of the first capacitor 31d1 is connected to the first terminal of the controller 40, and the second terminal of the first capacitor 31d1 is grounded. The second filter circuit 32d includes a second capacitor 32d1 and an eighth resistor 32d2. The first terminal of the eighth resistor 32d2 is connected to the first terminal of the sixth resistor 32c3, and the second terminal of the eighth resistor 32d2 is connected to the first terminal of the second capacitor 32d1. The second terminal of the second capacitor 32d1 is grounded.

[0073] Please see Figure 6 The wireless power supply device 200 also includes a protection circuit 70, which comprises a first protection circuit 71 and a second protection circuit 72. The first terminal of the first protection circuit 71 is connected to the second terminal of the first current sensor 31a, and the second terminal of the second protection circuit 71 is connected to the first terminal of the transmitting coil 12. The first current sensor 31a collects the current value of the AC input to the transmitting coil 12 based on electromagnetic induction, i.e., the sampled current value, and transmits the sampled current value to the first protection circuit 71.

[0074] The first protection circuit 71 controls the switching on and off of the signal between the inverter driver 22 and the high-frequency inverter 21 based on the received sampled current value. For example, if the sampled current value is greater than or equal to the current protection threshold of the first protection circuit 71, it is considered that the sampled current value is too large and may easily damage the components in the circuit. Therefore, 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 sampled current value is less than the current protection threshold of the first protection circuit 71, it is considered that the sampled current value is within the normal range and will not damage the components in the circuit. Therefore, the first protection circuit 71 controls the inverter driver 22 to continuously output the drive signal to the high-frequency inverter 21.

[0075] The first terminal of the first protection circuit 71 is connected to the second terminal of the first current sensor 31a, and the second terminal of the second protection circuit 72 is connected to the first terminal of the inverter driver 22. The first current sensor 31a collects the current value of the AC output of the high-frequency inverter 21 based on electromagnetic induction, that is, the second sampled current value, and transmits the second sampled current value to the first protection circuit 71.

[0076] The second protection circuit 72 controls the switching on and off of the signal between the inverter driver 22 and the high-frequency inverter 21 based on the received second sampled current value. For example, if the second sampled current value is greater than or equal to the current protection threshold of the second protection circuit 72, it is considered that the second sampled current value is too large and may easily damage the components in the circuit. Therefore, 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 sampled current value is less than the current protection threshold of the second protection circuit 72, it is considered that the second sampled current value is within the normal range and will not damage the components in the circuit. Therefore, the second protection circuit 72 controls the inverter driver 22 to continuously output the drive signal to the high-frequency inverter 21.

[0077] The protection circuit 70 controls the drive signal output by the inverter driver 22 based on 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 poses a risk of damaging the components in the circuit, the protection circuit 70 can quickly cut off the drive signal output of the inverter driver 22 to the high-frequency inverter 21, thereby improving the safety of the wireless power supply device 200.

[0078] This application also provides a wireless power supply system 500, such as... Figure 7As shown, the device includes a mobile device 400 and a wireless power supply device 200. The wireless power supply device 200 includes multiple transmitting resonant circuits 10, which are respectively arranged along the movement path of the mobile device 400, so that the alternating magnetic field generated by the transmitting resonant circuits 10 can cover the movement range of the mobile device 400. The mobile device 400 includes a receiving resonant circuit 410, a rectifier circuit 420, a DC-DC converter circuit 430, and a receiving control circuit 440. The first terminal of the receiving resonant circuit 410 is connected to the first terminal of the rectifier circuit 420, the second terminal of the rectifier circuit 420 is connected to the first terminal of the DC-DC converter circuit 430, and the second terminal of the DC-DC converter circuit 430 is connected to the receiving control circuit 440.

[0079] 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, and 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-DC converter circuit 430 through the rectifier circuit 420. The DC-DC converter circuit 430 converts the received induced current into DC power and outputs it to the receiving control circuit 440 to provide stable DC power to the mobile device 400.

[0080] In summary, this solution uses a second current acquisition circuit to sample the AC current value of the input transmitting coil in real time, obtains the sampled current value, and transmits it to the controller to control the AC motor of the input transmitting coil, thereby controlling the power supply efficiency of the wireless power supply device and improving its applicability. Furthermore, by placing multiple transmitting resonant circuits along the movement path of the mobile device, this solution ensures that the alternating magnetic field they generate covers the movement range of the mobile device, enabling the wireless power supply device to wirelessly power real-time moving mobile devices in dynamic environments.

[0081] It should be noted that the device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them; under the concept of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of this application as described above, which are not provided in detail for the sake of brevity; although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A wireless power supply device, characterized by comprising: Includes a transmitting resonant circuit, an inverter circuit, a current acquisition circuit, and a controller; The first terminal of the inverter circuit is connected to the mains power, and the second terminal of the inverter circuit is connected to the first terminal of the transmitting resonant circuit and the first terminal of the current acquisition circuit, respectively. The second terminal of the current acquisition circuit is connected to the second terminal of the transmitting resonant circuit, and the third terminal of the current acquisition circuit is connected to the first terminal of the controller. A controller, the second terminal of which is connected to the third terminal of the inverter circuit.

2. The wireless power supply device of claim 1, wherein, The transmitting resonant circuit includes a transmitting compensation network and a transmitting coil; The first end of the transmission compensation network is connected to the second end of the inverter circuit, the second end of the transmission compensation network is connected to the first end of the transmission coil, and the second end of the transmission coil is connected to the current acquisition circuit.

3. The wireless power supply device of claim 2, wherein, The inverter circuit includes a high-frequency inverter and an inverter driver; The first terminal of the inverter driver is connected to the second terminal of the controller, and the second terminal of the inverter driver is connected to the first terminal of the high-frequency inverter. The second terminal of the high-frequency inverter is connected to the mains power, and the third terminal of the high-frequency inverter is connected to the first terminal of the transmission compensation network and the first terminal of the current acquisition circuit, respectively.

4. The wireless power supply device of claim 3, wherein, The current acquisition circuit includes a first current acquisition 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. The first end of the first current sensor is connected to the second end of the transmitting coil, and the second end of the first current sensor is connected to the first end of the first rectifier circuit. The second terminal of the first rectifier circuit is connected to the first terminal of the first voltage conversion circuit, and the third terminal of the first rectifier circuit is connected to the second terminal of the first voltage conversion circuit. The first terminal of the first voltage conversion circuit is connected to the first terminal of the first filter circuit, and the second terminal of the first voltage conversion circuit is connected to the second terminal of the first filter circuit. The second terminal of the first filter circuit is grounded, and the third terminal of the first filter circuit is connected to the first terminal of the controller.

5. The wireless power supply device of claim 4, wherein, The current acquisition circuit also includes a second current acquisition 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 terminal of the second rectifier circuit is connected to the first terminal of the second voltage conversion circuit, and the third terminal of the second rectifier circuit is connected to the second terminal of the second voltage conversion circuit. The first terminal of the second voltage conversion circuit is connected to the first terminal of the second filter circuit, and the second terminal of the second voltage conversion circuit is connected to the second terminal of the second filter circuit. The second terminal of the second filter circuit is grounded, and the third terminal of the second filter circuit is connected to the first terminal of the controller.

6. The wireless power supply device according to claim 5, characterized in that, The first voltage conversion circuit includes a first resistor, a second resistor, a third resistor, and a first Zener diode; The first end of the first resistor is connected to the second end of the first rectifier circuit and the first end of the second resistor, respectively; the second end of the first resistor is connected to the third end of the first rectifier circuit and the second end of the second resistor, respectively. The first end of the second resistor is connected to the first end of the third resistor, and the second end of the second resistor is connected to the second end of the third resistor; The first end of the third resistor is connected to the first end of the first Zener diode, and the second end of the third resistor is connected to the second end of the first Zener diode. The first end of the first Zener diode is connected to the first end of the first filter circuit, and the second end of the first Zener diode is connected to the second end of the first filter circuit.

7. The wireless power supply device of claim 6, wherein, The second voltage conversion circuit includes a fourth resistor, a fifth resistor, a sixth resistor, and a second Zener diode; The first end of the fourth resistor is connected to the second end of the second rectifier circuit and the first end of the fifth resistor, respectively; the second end of the fourth resistor is connected to the third end of the second rectifier circuit and the second end of the fifth resistor, respectively. The first end of the fifth resistor is connected to the first end of the sixth resistor, and the second end of the fifth resistor is connected to the second end of the sixth resistor; The first end of the sixth resistor is connected to the first end of the second Zener diode, and the second end of the sixth resistor is connected to the second end of the second Zener diode; The first end of the second Zener diode is connected to the first end of the second filter circuit, and the second end of the second Zener diode is connected to the second end of the second filter circuit.

8. The wireless power supply device of claim 7, wherein, The first filter circuit includes a seventh resistor and a first capacitor, and the second filter circuit includes an eighth resistor and a second capacitor; The first end of the seventh resistor is connected to the first end of the third resistor, and the second end of the seventh resistor is connected to the first end of the first capacitor. The first terminal of the first capacitor is connected to the first terminal of the controller, and the second terminal of the first capacitor is grounded. The first end of the eighth resistor is connected to the first end of the sixth resistor, and the second end of the eighth resistor is connected to the first end of the second capacitor. The first terminal of the second capacitor is connected to the first terminal of the controller, and the second terminal of the second capacitor is grounded.

9. The wireless power supply device of claim 1, wherein, The wireless power supply device also includes a third filtering circuit; The first end of the third filter circuit is connected to the mains power, and the second end of the third filter circuit is connected to the first end of the inverter circuit.

10. A wireless power supply system characterized by comprising: include: The mobile device and the wireless power supply device as described in any one of claims 1-9.

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