Wireless power supply device and wireless power supply method

Abstract

The invention discloses a wireless power supply device and a wireless power supply method. The wireless power supply device comprises a transmitting coil, a control module, a switch module, a positioning module and a wireless power supply module; the switch module is connected with the control module, the transmitting coil, the positioning module and the wireless power supply module; the control module is used for controlling the positioning module to be connected with the transmitting coil when the switch module is in a first conduction state; the positioning module is used for generating an alternating magnetic field around the transmitting coil and outputting a position signal representing the position of the device to be powered according to the impedance change of the transmitting coil; the control module is further used for controlling the switch module to be in a second conduction state after determining the position of the to-be-powered device according to the position signal, and the wireless power supply module is connected with the transmitting coil so as to wirelessly supply power to the to-be-powered device. According to the technical scheme of the embodiment of the invention, the accuracy and efficiency of wireless power supply can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless power supply, and in particular to a wireless power supply device and a wireless power supply method. Background Art

[0002] Wireless power supply, also known as wireless energy transmission or wireless power transmission, is a technology that transfers electrical energy from a power generation device or power supply end to a power receiving device without using an electrical conductor. Currently, wireless power supply technology is used in the fields of personal consumer electronics, smart home, medical equipment, new energy vehicles, aerospace, etc.

[0003] Among them, in the field of medical devices, deep brain stimulation surgery, cochlear implants, and medical implants may include some devices with more bioelectronic characteristics in the future, such as equipment that can regulate hormone levels, control appetite, lower blood sugar, and treat brain damage. Wireless power supply technology has a large application space.

[0004] However, currently, for medical implants that use wireless power to provide energy, doctors are often required to determine the relative position of the implant based on experience and surgical procedures when performing external power supply, which results in a certain error rate and leads to power supply failure. Summary of the invention

[0005] The present invention provides a wireless power supply device and a wireless power supply method to improve the accuracy and efficiency of wireless power supply.

[0006] According to one aspect of the present invention, there is provided a wireless power supply device, including a transmitting coil, a control module, a switch module, a positioning module and a wireless power supply module;

[0007] The switch module is connected to the control module, the transmitting coil, the positioning module, and the wireless power supply module;

[0008] The control module is used to control the switch module to be in a first conducting state so that the positioning module is connected to the transmitting coil;

[0009] The positioning module is used to generate an alternating magnetic field around the transmitting coil, and output a position signal representing the position of the device to be powered according to the impedance change of the transmitting coil;

[0010] The control module is further used to control the switch module to be in a second conducting state after determining the position of the device to be powered according to the position signal, and the wireless power supply module is connected to the transmitting coil to wirelessly power the device to be powered.

[0011] Optionally, the positioning module includes an eddy current sensor chip;

[0012] The transmitting coil is used to generate impedance changes when it is close to a receiving coil arranged on the device to be powered. The positioning module monitors the impedance changes of the transmitting coil and changes the output voltage of the positioning module according to the impedance changes of the transmitting coil.

[0013] Optionally, the wireless power supply module includes a first frequency voltage generating circuit, a second frequency voltage generating circuit, a bootstrap circuit, a first switch unit, a second switch unit and a resonant capacitor;

[0014] The first end of the bootstrap circuit is connected to a power supply, the second end of the bootstrap circuit is connected to the second end of the transmitting coil and the first end of the resonant capacitor, the third end of the bootstrap circuit is connected to the first end of the second switch unit, and the fourth end of the bootstrap circuit and the second end of the second switch unit are both grounded; the control end of the second switch unit is connected to the output end of the second frequency voltage generating circuit, the second end of the resonant capacitor is connected to the first end of the first switch unit, the second end of the first switch unit is grounded, the control end of the first switch unit is connected to the output end of the first frequency voltage generating circuit, the resonant capacitor is used to form a resonant circuit with the transmitting coil, the bootstrap circuit is used to provide power for the resonant circuit, the first frequency voltage generating circuit is used to generate a first frequency voltage, and the second frequency voltage generating circuit is used to generate a second frequency voltage.

[0015] Optionally, the first frequency voltage generating circuit includes a first power supply chip and a first frequency adjustment unit, the second frequency voltage generating circuit includes a second power supply chip and a second frequency adjustment unit, the bootstrap circuit includes a first capacitor, an inductor and a diode, the first switch unit includes a first transistor, and the second switch unit includes a second transistor;

[0016] The first end of the first frequency adjustment unit is connected to the first end of the first power supply chip, the second end of the first frequency adjustment unit is connected to the second end of the first power supply chip, the third end of the first frequency adjustment unit is connected to the power supply, and the first frequency adjustment unit is used to adjust the frequency of the output voltage of the first power supply chip; the output end of the first power supply chip is connected to the control end of the first transistor, the first electrode of the first transistor is connected to the second end of the resonant capacitor and the first end of the transmitting coil, the first end of the inductor and the first end of the second frequency adjustment unit are connected to the power supply, the second end of the inductor is connected to the first electrode of the diode and the first electrode of the second transistor, the second electrode of the diode is connected to the first end of the first capacitor, the first end of the resonant capacitor, and the second end of the transmitting coil, the control end of the second transistor is connected to the output end of the second power supply chip, and the second end of the first capacitor, the second electrode of the first transistor, and the second electrode of the second transistor are all grounded;

[0017] The second end of the second frequency adjustment unit is connected to the first end of the second power supply chip, the third end of the second frequency adjustment unit is connected to the second end of the second power supply chip, and the second frequency adjustment unit is used to adjust the frequency of the output voltage of the second power supply chip.

[0018] Optionally, the switch module includes a relay switching circuit;

[0019] The relay switching circuit comprises a first control end and a second control end, wherein the first control end and the second control end are both connected to the control module;

[0020] The relay switching circuit further includes a first common terminal and a second common terminal, the first common terminal is connected to the first terminal of the transmitting coil, and the second common terminal is connected to the second terminal of the transmitting coil;

[0021] The relay switching circuit further includes a first switch end, a second switch end, a third switch end and a fourth switch end, the first switch end and the third switch end are connected to the positioning module, and the second switch end and the fourth switch end are connected to the wireless power supply module;

[0022] The relay switching circuit is used to control the first common terminal and the first switch terminal or the second switch terminal to be switched on according to the signal of the first control terminal; or, the relay switching circuit is used to control the second common terminal and the third switch terminal or the fourth switch terminal to be switched on according to the signal of the second control terminal.

[0023] Optionally, the relay switching circuit includes a first relay, a second relay, a third transistor and a fourth transistor;

[0024] The first end of the first relay is connected to the power supply and connected to the first electrode of the third transistor, the second electrode of the third transistor is grounded, the control electrode of the third transistor is connected to the control module, the second end of the first relay is grounded, the third end of the first relay is connected to the first end of the transmitting coil, the fourth end of the first relay is connected to the positioning module, and the fifth end of the first relay is connected to the wireless power supply module;

[0025] The first end of the second relay is connected to the power supply and is connected to the first electrode of the fourth transistor. The second electrode of the fourth transistor is grounded. The control electrode of the fourth transistor is connected to the control module. The second end of the second relay is grounded. The third end of the second relay is connected to the second end of the transmitting coil. The fourth end of the second relay is connected to the positioning module. The fifth end of the second relay is connected to the wireless power supply module.

[0026] Optionally, the wireless power supply device further includes a voltage feedback module;

[0027] The input end of the voltage feedback module is connected to the output end of the positioning module, and the output end of the voltage feedback module is connected to the control module.

[0028] Optionally, the wireless power supply device further includes a power button, a power indication module and a detection indication module;

[0029] The power button and the power indication module are connected to a power supply, and the detection indication module is connected to the control module.

[0030] Optionally, the wireless power supply device further includes a shell;

[0031] The transmitting coil, the control module, the switch module, the positioning module, the wireless power supply module, the relay switching module, the voltage feedback module, the power button, the power indication module and the detection indication module are arranged inside the shell, and the front side of the shell includes an opening for observing the status of the power indication module and the detection indication module.

[0032] According to another aspect of the present invention, a wireless power supply method is provided, wherein the wireless power supply device includes a transmitting coil, a control module, a switch module, a positioning module and a wireless power supply module;

[0033] The wireless power supply method comprises:

[0034] The switch module is in a first conducting state according to a control signal of the control module;

[0035] When the switch module is in a first conducting state, the positioning module is connected to the transmitting coil and changes the output voltage of the positioning module;

[0036] The switch module is in a second conducting state according to a control signal of the control module;

[0037] When the switch module is in the second conducting state, the wireless power supply module is connected to the transmitting coil to wirelessly supply power to the device to be powered.

[0038] The technical solution of the embodiment of the present invention is to set a transmitting coil, a switch module, a positioning module and a wireless power supply module, so that when the switch module is in the first conduction state according to the control signal of the control module, the transmitting coil is connected to the positioning module, the positioning module generates an alternating magnetic field around the transmitting coil, and when the transmitting coil is close to the receiving coil, the impedance of the transmitting coil changes, thereby changing the output voltage of the positioning module, and further determining the position of the device to be powered according to the output voltage of the positioning module. When the position of the device to be powered is determined, the control module outputs a control signal to put the switch module in the second conduction state, the transmitting coil is connected to the wireless power supply module, and the wireless power supply module generates an alternating magnetic field with a stronger magnetic field intensity around the transmitting coil to wirelessly power the device to be powered. The positioning device can accurately locate the position of the device to be powered, which can avoid the problem of power supply failure due to position error between the wireless power supply device and the device to be powered, thereby improving the accuracy and efficiency of wireless power supply.

[0039] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0041] Figure 1 A schematic diagram of the structure of a wireless power supply device provided by an embodiment of the present invention;

[0042] Figure 2 A schematic structural diagram of another wireless power supply device provided by an embodiment of the present invention;

[0043] Figure 3 A schematic structural diagram of another wireless power supply device provided by an embodiment of the present invention;

[0044] Figure 4 A schematic structural diagram of another wireless power supply device provided by an embodiment of the present invention;

[0045] Figure 5 A schematic structural diagram of another wireless power supply device provided by an embodiment of the present invention;

[0046] Figure 6 A schematic diagram of a wireless power supply device provided by an embodiment of the present invention being placed in a housing;

[0047] Figure 7 A schematic diagram of a housing of a wireless power supply device provided by an embodiment of the present invention;

[0048] Figure 8 A flowchart of a wireless power supply method provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0049] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0050] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0051] Figure 1 A schematic diagram of a wireless power supply device according to an embodiment of the present invention is provided. Figure 1The wireless power supply device provided in the embodiment of the present invention includes a transmitting coil L1, a control module 10, a switch module 20, a positioning module 30 and a wireless power supply module 40; the switch module 20 is connected to the control module 10, the transmitting coil L1, the positioning module 30 and the wireless power supply module 40; the control module 10 is used to control the switch module 20 to be in a first conduction state, and the positioning module 30 is connected to the transmitting coil L1; the positioning module 30 is used to generate an alternating magnetic field around the transmitting coil L1, and output a position signal representing the position of the device to be powered according to the impedance change of the transmitting coil L1; the control module 40 is also used to control the switch module 20 to be in a second conduction state after determining the position of the device to be powered according to the position signal, and the wireless power supply module 40 is connected to the transmitting coil L1, so as to wirelessly power the device to be powered.

[0052] Among them, the device to be powered has a built-in receiving coil, and the receiving coil is made of metal; the transmitting coil L1 is an inductor coil with a specific inductance value, and the inductance value of the inductor coil is used to match the inductance value of the receiving coil of the device to be powered; the control module 10 may include a microprocessor for executing program instructions and processing data; the switch module 20 may exemplarily include two conduction states, and the two conduction states are: connecting the positioning module 30 to the transmitting coil L1 or connecting the wireless power supply module 40 to the transmitting coil L1.

[0053] Specifically, when the wireless power supply device is powered, the control module 10 controls the positioning module 30 to be connected to the transmitting coil L1 through the switch module 20. The positioning module 30 generates a high-frequency signal according to the input power supply voltage, and generates an alternating magnetic field around the transmitting coil L1. When the transmitting coil L1 is close to the device to be powered, the receiving coil in the device to be powered will generate an alternating magnetic field in the opposite direction to the transmitting coil L1, thereby changing the amplitude and phase of the high-frequency current flowing through the transmitting coil L1, and then changing the effective impedance of the transmitting coil L1, so that the output voltage of the positioning module 30 changes, and the control module 10 determines the position of the device to be powered according to the output voltage of the positioning module 30 received. When the position of the device to be powered is determined, the control module 10 controls the wireless power supply module 40 to be connected to the transmitting coil L1 through the switch module 20, so that an alternating magnetic field with a stronger magnetic field strength is generated around the transmitting coil L1, and then the device to be powered is powered through the transmitting coil L1.

[0054] The technical solution of the embodiment of the present invention is to set a transmitting coil, a switch module, a positioning module and a wireless power supply module, so that when the switch module is in the first conduction state according to the control signal of the control module, the transmitting coil is connected to the positioning module, the positioning module generates an alternating magnetic field around the transmitting coil, and when the transmitting coil is close to the receiving coil, the impedance of the transmitting coil changes, thereby changing the output voltage of the positioning module, and further determining the position of the device to be powered according to the output voltage of the positioning module. When the position of the device to be powered is determined, the control module outputs a control signal to put the switch module in the second conduction state, the transmitting coil is connected to the wireless power supply module, and the wireless power supply module generates an alternating magnetic field with a stronger magnetic field intensity around the transmitting coil to wirelessly power the device to be powered. The positioning device can accurately locate the position of the device to be powered, which can avoid the problem of power supply failure due to position error between the wireless power supply device and the device to be powered, thereby improving the accuracy and efficiency of wireless power supply.

[0055] Figure 2 A schematic diagram of another wireless power supply device provided in an embodiment of the present invention, referring to Figure 2 On the basis of the above embodiment, the positioning module 30 includes an eddy current sensor chip U1; the transmitting coil L1 is used to generate an impedance change when it is close to a receiving coil arranged in the device to be powered, and the positioning module 30 monitors the impedance change of the transmitting coil L1 and changes the output voltage VOUT of the positioning module 30 according to the impedance change of the transmitting coil L1.

[0056] The working principle of the eddy current sensor chip U1 is based on Faraday's law of electromagnetic induction and Lenz's law. When a metal conductor moves in a changing magnetic field, an induced electromotive force is generated inside the conductor, forming a closed current loop, namely eddy current. The eddy current sensor chip U1 uses this principle to measure the displacement, vibration, velocity, acceleration and other physical quantities of an object by measuring the size or phase change of the eddy current.

[0057] Specifically, when the eddy current sensor chip U1 is connected to the power supply voltage VCC, the high-frequency signal it outputs generates an alternating magnetic field around the transmitting coil L1. When it is close to the receiving coil, the alternating magnetic field generates an eddy current field on the surface of the receiving coil. The eddy current field will generate an alternating magnetic field in the opposite direction to the alternating magnetic field of the transmitting coil L1, thereby changing the effective impedance of the transmitting coil L1, causing the output voltage VOUT of the eddy current sensor chip U1 to change, and transmitting the output voltage VOUT to the first end 11 of the control module 10. Further, the control module 10 detects the output voltage VOUT, and the detection result can characterize the position of the device to be powered. By setting the eddy current sensor chip to locate the device to be powered, the positioning sensitivity is high, the anti-interference ability is strong, and the response speed is fast.

[0058] Optionally, continue to refer to Figure 2 The positioning module 30 also includes a fifth transistor Q5, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a resistor R1 and a resistor R3. The first end of the eddy current sensor chip U1 is connected to the first end of the resistor R1, the first electrode of the fifth transistor Q5, the first end of the fourth capacitor C4, and the second end of the transmitting coil L1. The second end of the resistor R1 and the second end of the resistor R3 are connected to the power supply. The second end of the fourth capacitor C4, the second electrode of the fifth transistor Q5, and the second end of the second capacitor C2 are grounded. The control electrode of the fifth transistor Q5 is connected to the first end of the resistor R3 and the first end of the third capacitor C3. The second end of the third capacitor C3 is connected to the first end of the second capacitor C2 and the first end of the transmitting coil L1.

[0059] Among them, the resistor R1 is the bias resistor of the collector of the fifth transistor Q5, and the resistor R3 is the bias resistor of the base of the fifth transistor Q5, which is used to provide a suitable bias current for the fifth transistor Q5 when the power supply voltage VCC passes through the first resistor R1; when the power supply voltage VCC passes through the first resistor R1 and the third resistor R3, the emitter junction of the fifth transistor Q5 is forward biased and the collector junction is reverse biased, so that the fifth transistor Q5 works in the amplification area. The second capacitor C2 is used to form an LC resonant circuit in series with the transmitting coil L1, the third capacitor C3 is a coupling capacitor, and the fourth capacitor C4 is a filter capacitor for filtering. The fifth transistor Q5 is used to amplify the weak input signal into a larger output signal when working in the amplification area to achieve the signal amplification effect, and the power supply is used to provide the power supply voltage VCC.

[0060] Specifically, when the eddy current sensor chip U1 is connected to the transmitting coil L1, the transmitting coil L1 and the second capacitor C2 are connected in series to form a resonant circuit. When the transmitting coil L1 is close to the receiving coil, the impedance of the transmitting coil L1 increases, and the current flowing through the transmitting coil L1 decreases, thereby causing the current magnitude of the base and emitter of the fifth transistor Q5 to change. Due to the amplification characteristics of the fifth transistor Q5, the current of the collector follows the change, and the voltage division on the first resistor R1 follows the change, and the input voltage collected by the first end of the eddy current sensor chip U1 fluctuates, thereby changing the output voltage VOUT of the second end of the eddy current sensor chip U1.

[0061] Furthermore, the control module 10 detects according to the output voltage VOUT, and when the output voltage VOUT is detected to be within the preset voltage range, it is determined that the position of the device to be powered matches the position of the wireless power supply device. The preset voltage range can be specifically understood as: determining a reasonable voltage range through experiments, that is, a preset voltage range. Since the output voltage of the eddy current sensor chip U1 is related to the conductivity, magnetic permeability, geometry, excitation current frequency, distance of the metal conductor and other factors of the metal conductor, multiple groups of sample experiments are first performed on the metal-containing implant, and the distance between the transmitting coil L1 and the receiving coil (metal conductor) of the device to be powered that meets the wireless power supply efficiency condition is specified to be d1. The experimental data show that within the range of ≤d1, the output voltage value of the eddy current sensor chip U1 received by the control module 10 is V1-V2, and V1-V2 is the preset voltage range.

[0062] It is understandable that the parameters of the metal conductors of the receiving coils of different devices to be powered are different, the distances between the transmitting coil L1 that meets the wireless power supply efficiency conditions and the receiving coil (metal conductor) of the device to be powered are also different, and the preset voltage ranges are also different.

[0063] Figure 3 A schematic diagram of another wireless power supply device provided in an embodiment of the present invention, referring to Figure 3 On the basis of the above embodiments, the wireless power supply module 40 includes a first frequency voltage generating circuit 41, a second frequency voltage generating circuit 42, a bootstrap circuit 43, a first switch unit 44, a second switch unit 45 and a resonant capacitor C0; a first end of the bootstrap circuit 43 is connected to a power supply, a second end of the bootstrap circuit 43 is connected to a second end of the transmitting coil L1 and a first end of the resonant capacitor C0, a third end of the bootstrap circuit 43 is connected to a first end of the second switch unit 45, and a fourth end of the bootstrap circuit 43 and a second end of the second switch unit 45 are both grounded; a control end of the second switch unit 45 is connected to an output end of the second frequency voltage generating circuit 42, a second end of the resonant capacitor C0 is connected to a first end of the first switch unit 44, a second end of the first switch unit 44 is grounded, a control end of the first switch unit 44 is connected to an output end of the first frequency voltage generating circuit 41, the resonant capacitor C0 is used to form a resonant circuit with the transmitting coil L1, the bootstrap circuit 43 is used to provide power for the resonant circuit, the first frequency voltage generating circuit 41 is used to generate a first frequency voltage, and the second frequency voltage generating circuit 42 is used to generate a second frequency voltage.

[0064] Among them, the bootstrap circuit 43 usually uses electronic components such as a bootstrap boost diode or a bootstrap boost capacitor, and the capacitor discharge voltage and the power supply voltage are superimposed, so that the power supply is increased. The output of the first frequency voltage generating circuit 41 and the second frequency voltage generating circuit 42 is a sine wave voltage. The first switch unit 44 is used to turn on or off according to the output voltage of the output end of the first frequency voltage generating circuit 41. For example, when the output voltage of the output end of the first frequency voltage generating circuit 41 is a high level, the first switch unit 44 is turned on, and when the output voltage of the output end of the first frequency voltage generating circuit 41 is a low level, the first switch unit 44 is turned off; or, when the output voltage of the output end of the first frequency voltage generating circuit 41 is a high level, the first switch unit 44 is turned off, and when the output voltage of the output end of the first frequency voltage generating circuit 41 is a low level, the first switch unit 44 is turned on. The second switch unit 45 is used to turn on or off according to the output voltage of the output end of the second frequency voltage generating circuit 42. Exemplarily, when the output voltage at the output end of the second frequency voltage generating circuit 42 is at a high level, the second switch unit 45 is turned on, and when the output voltage at the output end of the second frequency voltage generating circuit 42 is at a low level, the second switch unit 45 is turned off; or, when the output voltage at the output end of the second frequency voltage generating circuit 42 is at a high level, the second switch unit 45 is turned off, and when the output voltage at the output end of the second frequency voltage generating circuit 42 is at a low level, the second switch unit 45 is turned on.

[0065] Specifically, when the second frequency voltage generating circuit 42 outputs a low level, the second switch unit 45 is in an off state, and when the second frequency voltage generating circuit 42 outputs a high level, the second switch unit 45 is in an on state. And because the second frequency voltage generating circuit 42 outputs a sinusoidal wave voltage, the second switch unit 45 is in a cyclic on or off state at a higher frequency, so that the bootstrap circuit 43 is continuously charged to a higher voltage.

[0066] When the output of the first frequency voltage generating circuit 41 is high, the first switch unit 44 is in the on state, and the bootstrap circuit 43 discharges through the resonant capacitor C0 and the transmitting coil L1 (i.e., the resonant circuit), so that an alternating magnetic field with a stronger magnetic field intensity is generated around the transmitting coil L1, thereby wirelessly powering the device to be powered.

[0067] It can be understood that when the second switch unit 45 is in the on state, the fourth terminal of the bootstrap circuit 43 is always grounded at a low level, and the second terminal of the inductor L2 is grounded. At this time, the current on the inductor L2 will increase linearly, and when the second switch unit 45 is in the off state, it will be discharged. As the discharge time increases (for example, the second switch unit 45 is no longer turned on), the output voltage of the inductor L2 will gradually decrease until it decreases to the power supply voltage VCC. However, since the second switch unit 45 is in a continuous cycle of on or off state switching at a higher frequency, the voltage difference across the bootstrap circuit 43 will not increase infinitely.

[0068] Optionally, continue to refer to Figure 3 The first frequency voltage generating circuit 41 includes a first power supply chip U2 and a first frequency adjusting unit 411, the second frequency voltage generating circuit 42 includes a second power supply chip U3 and a second frequency adjusting unit 422, the bootstrap circuit 43 includes a first capacitor C1, an inductor L2 and a diode D1, the first switch unit 44 includes a first transistor Q1, and the second switch unit 45 includes a second transistor Q2; the first end of the first frequency adjusting unit 411 is connected to the first end of the first power supply chip U2, the second end of the first frequency adjusting unit 411 is connected to the second end of the first power supply chip U2, the third end of the first frequency adjusting unit 411 is connected to the power supply, and the first frequency adjusting unit 411 is used to adjust the frequency of the output voltage of the first power supply chip U2; the output end of the first power supply chip U2 is connected to the control end of the first transistor Q1, and the first electrode of the first transistor Q1 is connected to the resonant The second end of the capacitor C0 is connected to the first end of the transmitting coil L1, the first end of the inductor L2 is connected to the first end of the second frequency adjustment unit 422 and is connected to the power supply, the second end of the inductor L2 is connected to the first electrode of the diode D1 and the first electrode of the second transistor Q2, the second electrode of the diode D1 is connected to the first end of the first capacitor C1, the first end of the resonant capacitor C0, and the second end of the transmitting coil L1, the control end of the second transistor Q2 is connected to the output end of the second power supply chip U3, the second end of the first capacitor C1, the second electrode of the first transistor Q1, and the second electrode of the second transistor Q2 are all grounded; the second end of the second frequency adjustment unit 422 is connected to the first end of the second power supply chip U3, the third end of the second frequency adjustment unit 422 is connected to the second end of the second power supply chip U3, and the second frequency adjustment unit 422 is used to adjust the frequency of the output voltage of the second power supply chip U3.

[0069] The inductor L2 may be a magnetic ring inductor, used to supply power to the first capacitor C1; the diode D1 may be a Schottky diode, used to prevent current from flowing back into the previous stage circuit.

[0070] Specifically, the second frequency adjustment unit 422 adjusts the duty cycle of the output voltage of the second power supply chip U3, and the first frequency adjustment unit 411 adjusts the duty cycle of the output voltage of the first power supply chip U2, and the duty cycle of the output voltage of the second power supply chip U3 is different from the duty cycle of the output voltage of the first power supply chip U2. At the same time, the first frequency adjustment unit 411 is also used to adjust the frequency of the output voltage of the first power supply chip U2 to be the same as the frequency of the resonant circuit composed of the resonant capacitor C0 and the transmitting coil L1. The specific working principle of the bootstrap circuit 43 is: when the second power supply chip U3 outputs a voltage that causes the second transistor Q2 to be in a conducting state, the inductor L2 absorbs energy through the power supply voltage VCC. Specifically, since the power supply voltage VCC is direct current, the current on the inductor L2 increases linearly at a certain ratio. As the current of the inductor L2 increases, energy is stored in the inductor L2. At this time, it is the charging stage of the inductor L2. When the second power supply chip U3 outputs a voltage that causes the second transistor Q2 to be in an off state, the inductor L2 releases energy through the diode D1 and the first capacitor C1, thereby charging the first capacitor C1. Among them, when the inductance of the inductor L2 is large enough, the inductor L2 can maintain a continuous current in the process of releasing energy. And because the second frequency voltage generating circuit 42 outputs a sinusoidal voltage, the second switch unit 45 is in a cyclic on or off state at a higher frequency, so that the two ends of the first capacitor C1 obtain a voltage higher than the power supply voltage VCC. When the first power supply chip U2 outputs a voltage that causes the first transistor Q1 to be in a conducting state, the voltage of the first capacitor C1 is discharged through the resonant capacitor C0 and the transmitting coil L1, so that an alternating magnetic field with a stronger magnetic field strength is generated around the transmitting coil L1, thereby wirelessly powering the device to be powered.

[0071] The technical solution of the embodiment of the present invention is to set a first frequency adjustment unit and a second frequency adjustment unit, so that the first frequency adjustment unit can match the frequency of the resonant circuit composed of the resonant capacitor and the transmitting coil, thereby maximizing the efficiency of energy transfer, reducing interference and overheating, and thus improving the working effect of the device. The second frequency adjustment unit can make the second transistor continuously turn on and off at a more appropriate frequency, so that the inductor is in a state of absorbing energy to boost the voltage or releasing the capacity to charge the first capacitor, so that the potential at both ends of the first capacitor to the ground is kept higher than the power supply voltage, so as to achieve the purpose of self-boosting, thereby ensuring that the resonant circuit obtains a higher voltage power supply, so that the transmitting coil generates a stronger magnetic field, and thus can improve the wireless power supply effect.

[0072] Optionally, continue to refer to Figure 3The wireless power supply module 40 also includes a protection unit 46 and a resistor R2. The first end of the protection unit 46 is connected to the third end of the second power supply chip U3 and the first end of the resistor R2, the second end of the protection unit 46 is connected to the first end of the resonant capacitor C0 and the first end of the diode D1, the third end of the protection unit 46 is grounded, the second end of the resistor R2 is connected to the power supply, and the second end of the diode D1 is connected to the diode of the second transistor Q2.

[0073] Among them, the resistor R2 is a pull-up resistor.

[0074] Specifically, when the current flowing through the transmitting coil L1 is normal, the protection unit 46 is turned off, and the third terminal of the second power supply chip U3 is pulled up to the power supply voltage VCC, that is, the third terminal input of the second power supply chip U3 is high level, and the output terminal of the second power supply chip U3 outputs voltage normally. When the voltage on the transmitting coil L1 is too large, the protection unit 46 is turned on, so that the third terminal of the second power supply chip U3 is pulled down to the ground, that is, the third terminal input of the second power supply chip U3 is low level, so that the output terminal of the second power supply chip U3 has no voltage signal output. Further, when the output terminal of the second power supply chip U3 has no voltage signal output, the second switch tube Q2 is in the off state for a long time, the output voltage of the inductor L2 gradually decreases to the power supply voltage VCC, and the voltage of the first capacitor C1 gradually decreases after supplying power to the resonant circuit. After it drops to a safe range, the protection unit 46 is disconnected, and the second power supply chip U3 resumes normal output. By setting the protection unit, it is possible to avoid component damage caused by excessive current in the loop, reduce the risk of overheating, improve the stability and safety of the system, and extend the service life of the components.

[0075] Optionally, continue to refer to Figure 3 The wireless power supply device also includes a fourth capacitor C4 connected between the power supply and the ground for filtering.

[0076] Figure 4 A schematic diagram of another wireless power supply device provided in an embodiment of the present invention, referring to Figure 4On the basis of the above embodiments, the switch module 20 includes a relay switching circuit; the relay switching circuit includes a first control end and a second control end, both of which are connected to the control module 10; the relay switching circuit also includes a first common end and a second common end, the first common end is connected to the first end of the transmitting coil L1, and the second common end is connected to the second end of the transmitting coil L1; the relay switching circuit also includes a first switch end, a second switch end, a third switch end and a fourth switch end, the first switch end and the third switch end are connected to the positioning module 30, and the second switch end and the fourth switch end are connected to the wireless power supply module 40; the relay switching circuit is used to control the first common end to be switched on with the first switch end or the second switch end according to the signal of the first control end; or, the relay switching circuit is used to control the second common end to be switched on with the third switch end or the fourth switch end according to the signal of the second control end.

[0077] Specifically, when the wireless power supply device is connected to the power supply voltage VCC, and the second terminal 12 and the third terminal 13 of the control module 10 output the first control signal, the relay switching circuit controls the first common terminal to be connected to the first switch terminal, and controls the second common terminal to be connected to the third switch terminal, so that the transmitting coil L1 is connected to the positioning module 30, thereby locating the position of the device to be powered. When the position signal is determined, the wireless power supply device stops moving, and the second terminal 12 and the third terminal 13 of the control module 10 output the second control signal, and the relay switching circuit controls the first common terminal to be connected to the second switch terminal, and controls the second common terminal to be connected to the fourth switch terminal, so that the transmitting coil L1 is connected to the wireless power supply module 40 to power the device to be powered.

[0078] The technical solution of the embodiment of the present invention can realize automatic control of the device by setting a relay switching circuit, thereby improving the flexibility and convenience of the wireless power supply device.

[0079] Optionally, continue to refer to Figure 4The relay switching circuit includes a first relay J1, a second relay J2, a third transistor Q3 and a fourth transistor Q4; a first end of the first relay J1 is connected to a power supply and is connected to a first electrode of the third transistor Q3, a second electrode of the third transistor Q3 is grounded, a control electrode NET1 of the third transistor Q3 is connected to a second end 12 of the control module 10, a second end of the first relay J1 is grounded, a third end of the first relay J1 is connected to a first end of the transmitting coil L1, a fourth end of the first relay J1 is connected to a positioning module 30, and a fifth end of the first relay J1 is connected to a wireless power supply module 40; a first end of the second relay J2 is connected to a power supply and is connected to a first electrode of the fourth transistor Q4, a second electrode of the fourth transistor Q4 is grounded, a control electrode NET2 of the fourth transistor Q4 is connected to a third end 13 of the control module 10, a second end of the second relay J2 is grounded, a third end of the second relay J2 is connected to a second end of the transmitting coil L1, a fourth end of the second relay J2 is connected to the positioning module 30, and a fifth end of the second relay is connected to the wireless power supply module 40.

[0080] Optionally, the relay switching circuit further includes a resistor R4 and a resistor R5, wherein the first end of the resistor R4 is connected to the control of the third transistor Q3, and the second end of the resistor R4 is grounded; the first end of the resistor R5 is connected to the control of the fourth transistor Q4, and the second end of the resistor R5 is grounded. The resistor R4 is used to stabilize the operating point of the third transistor Q3, and the resistor R5 is used to stabilize the operating point of the fourth transistor Q4.

[0081] Specifically, when the wireless power supply device is connected to the power supply voltage VCC, the second terminal 12 and the third terminal 13 of the control module 10 output a first control signal, and the first relay J1 and the second relay J2 connect the transmitting coil L1 to the positioning module 30, so as to locate the position of the device to be powered. When the position is determined, the second terminal 12 and the third terminal 13 of the control module 10 output a second control signal, and the first relay J1 and the second relay J2 connect the transmitting coil L1 to the wireless power supply module 40 to power the device to be powered. By setting the first relay and the second relay, the demand for electronic switches in complex circuits can be reduced, simplifying design and maintenance.

[0082] Figure 5 A schematic diagram of another wireless power supply device provided in an embodiment of the present invention, referring to Figure 5 On the basis of the above embodiments, the wireless power supply device further includes a voltage feedback module 50; the input end of the voltage feedback module 50 is connected to the output end of the positioning module 30, and the output end of the voltage feedback module 50 is connected to the control module 10.

[0083] The output end of the voltage feedback module 50 is connected to the first end 11 of the control module 10 .

[0084] Specifically, the output voltage VOUT of the output end of the positioning module 30 is output to the voltage feedback module 50 , and the output voltage VOUT is detected. Further, the output voltage VOUT is fed back to the control module 10 .

[0085] Optionally, continue to refer to Figure 5 The wireless power supply device also includes a power button 60, a power indication module 70 and a detection indication module 80; the power button 60 and the power indication module 70 are connected to the power supply, and the detection indication module 80 is connected to the control module 10.

[0086] Specifically, the power button 60 controls the power on and off of the wireless power supply device, the power indication module 70 indicates the working state of the power supply, and the detection indication module 80 indicates the position of the device to be powered.

[0087] Figure 6 A schematic diagram of a wireless power supply device provided by an embodiment of the present invention being placed in a housing, Figure 7 A schematic diagram of a housing of a wireless power supply device provided in an embodiment of the present invention, referring to Figure 6 and Figure 7 The transmitting coil L1, the control module, the switch module, the positioning module, the wireless power supply module, the voltage feedback module, the power button, the power indication module and the detection indication module are arranged inside the shell, and the front side of the shell includes an opening for observing the status of the power indication module and the detection indication module.

[0088] It can be understood that the control module, switch module, positioning module, wireless power supply module, voltage feedback module, power button, power indicator module and detection indicator module shown in the figure are all arranged on the circuit board 100. And the button position 81 is the power button, the opening position 71 is the power indicator light, and the opening position 61 is the detection indicator light.

[0089] Specifically, the shell can be understood as a handheld shell. The material of the handheld shell can be plastic or other materials, preferably ABS (Acrylonitrile Butadiene Styrene) / PC (Polycarbonate) to meet the use scenario requirements of home medical products. The appearance is ergonomically designed, with a circular structure on the top to accommodate the transmitting end coil L1, and a handle shape on the bottom. The corresponding mounting structure is arranged inside to fix the circuit board 100 and other related components. At the same time, the external shape is convenient for users to grasp.

[0090] It is understandable that the above-mentioned appearance and main components are only examples for the convenience of explanation, and changes to their appearance and the positions of their components are still within the scope of protection of the present invention.

[0091] Figure 8 A flowchart of a wireless power supply method provided in an embodiment of the present invention can be applied to a wireless power supply device provided in any embodiment of the present invention, refer to Figure 8 , based on the above embodiments, the wireless power supply device includes a transmitting coil, a control module, a switch module, a positioning module and a wireless power supply module;

[0092] Wireless power delivery methods include:

[0093] S101 . The switch module is in a first conducting state according to a control signal of a control module.

[0094] S102: When the switch module is in the first conducting state, the positioning module is connected to the transmitting coil and the output voltage of the positioning module is changed.

[0095] S103: The switch module is in a second conducting state according to a control signal of the control module.

[0096] S104: When the switch module is in the second conducting state, the wireless power supply module is connected to the transmitting coil to wirelessly supply power to the device to be powered.

[0097] The technical solution of the embodiment of the present invention is to set a transmitting coil, a switch module, a positioning module and a wireless power supply module, so that when the switch module is in the first conduction state according to the control signal of the control module, the transmitting coil is connected to the positioning module, the positioning module generates an alternating magnetic field around the transmitting coil, and when the transmitting coil is close to the receiving coil, the impedance of the transmitting coil changes, thereby changing the output voltage of the positioning module, and further determining the position of the device to be powered according to the output voltage of the positioning module. When the position of the device to be powered is determined, the control module outputs a control signal to put the switch module in the second conduction state, the transmitting coil is connected to the wireless power supply module, and the wireless power supply module generates an alternating magnetic field with a stronger magnetic field intensity around the transmitting coil to wirelessly power the device to be powered. The positioning device can accurately locate the position of the device to be powered, which can avoid the problem of power supply failure due to position error between the wireless power supply device and the device to be powered, thereby improving the accuracy and efficiency of wireless power supply.

[0098] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0099] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A wireless power supply device, characterized in that: It includes a transmitting coil, a control module, a switch module, a positioning module and a wireless power supply module; The switch module is connected to the control module, the transmitting coil, the positioning module, and the wireless power supply module; the control module is used to control the switch module to be in a first conducting state, so that the positioning module is connected to the transmitting coil; The positioning module is used to generate an alternating magnetic field around the transmitting coil, and output a position signal representing the position of the device to be powered according to the impedance change of the transmitting coil; The control module is further used to control the switch module to be in a second conducting state after determining the position of the device to be powered according to the position signal, and the wireless power supply module is connected to the transmitting coil to wirelessly power the device to be powered.

2. The wireless power supply device according to claim 1, characterized in that: The positioning module includes an eddy current sensor chip; The transmitting coil is used to generate impedance changes when it is close to a receiving coil arranged on the device to be powered. The positioning module monitors the impedance changes of the transmitting coil and changes the output voltage of the positioning module according to the impedance changes of the transmitting coil.

3. The wireless power supply device according to claim 1, characterized in that: The wireless power supply module includes a first frequency voltage generating circuit, a second frequency voltage generating circuit, a bootstrap circuit, a first switch unit, a second switch unit and a resonant capacitor; The first end of the bootstrap circuit is connected to a power supply, the second end of the bootstrap circuit is connected to the second end of the transmitting coil and the first end of the resonant capacitor, the third end of the bootstrap circuit is connected to the first end of the second switch unit, and the fourth end of the bootstrap circuit and the second end of the second switch unit are both grounded; the control end of the second switch unit is connected to the output end of the second frequency voltage generating circuit, the second end of the resonant capacitor is connected to the first end of the first switch unit, the second end of the first switch unit is grounded, the control end of the first switch unit is connected to the output end of the first frequency voltage generating circuit, the resonant capacitor is used to form a resonant circuit with the transmitting coil, the bootstrap circuit is used to provide power for the resonant circuit, the first frequency voltage generating circuit is used to generate a first frequency voltage, and the second frequency voltage generating circuit is used to generate a second frequency voltage.

4. The wireless power supply device according to claim 3, characterized in that: The first frequency voltage generating circuit includes a first power supply chip and a first frequency adjustment unit, the second frequency voltage generating circuit includes a second power supply chip and a second frequency adjustment unit, the bootstrap circuit includes a first capacitor, an inductor and a diode, the first switch unit includes a first transistor, and the second switch unit includes a second transistor; The first end of the first frequency adjustment unit is connected to the first end of the first power supply chip, the second end of the first frequency adjustment unit is connected to the second end of the first power supply chip, the third end of the first frequency adjustment unit is connected to the power supply, and the first frequency adjustment unit is used to adjust the frequency of the output voltage of the first power supply chip; the output end of the first power supply chip is connected to the control end of the first transistor, the first electrode of the first transistor is connected to the second end of the resonant capacitor and the first end of the transmitting coil, the first end of the inductor and the first end of the second frequency adjustment unit are connected to the power supply, the second end of the inductor is connected to the first electrode of the diode and the first electrode of the second transistor, the second electrode of the diode is connected to the first end of the first capacitor, the first end of the resonant capacitor, and the second end of the transmitting coil, the control end of the second transistor is connected to the output end of the second power supply chip, and the second end of the first capacitor, the second electrode of the first transistor, and the second electrode of the second transistor are all grounded; The second end of the second frequency adjustment unit is connected to the first end of the second power supply chip, the third end of the second frequency adjustment unit is connected to the second end of the second power supply chip, and the second frequency adjustment unit is used to adjust the frequency of the output voltage of the second power supply chip.

5. The wireless power supply device according to claim 1, characterized in that: The switch module includes a relay switching circuit; The relay switching circuit comprises a first control end and a second control end, wherein the first control end and the second control end are both connected to the control module; The relay switching circuit further includes a first common terminal and a second common terminal, the first common terminal is connected to the first terminal of the transmitting coil, and the second common terminal is connected to the second terminal of the transmitting coil; The relay switching circuit further includes a first switch end, a second switch end, a third switch end and a fourth switch end, the first switch end and the third switch end are connected to the positioning module, and the second switch end and the fourth switch end are connected to the wireless power supply module; The relay switching circuit is used for controlling the first common terminal and the first switch terminal or the second switch terminal to be switched on according to the first control terminal signal; Alternatively, the relay switching circuit is used to control the second common terminal and the third switch terminal or the fourth switch terminal to be switched on according to a signal from the second control terminal.

6. The wireless power supply device according to claim 5, characterized in that: The relay switching circuit includes a first relay, a second relay, a third transistor and a fourth transistor; The first end of the first relay is connected to the power supply and connected to the first electrode of the third transistor, the second electrode of the third transistor is grounded, the control electrode of the third transistor is connected to the control module, the second end of the first relay is grounded, the third end of the first relay is connected to the first end of the transmitting coil, the fourth end of the first relay is connected to the positioning module, and the fifth end of the first relay is connected to the wireless power supply module; The first end of the second relay is connected to the power supply and is connected to the first electrode of the fourth transistor. The second electrode of the fourth transistor is grounded. The control electrode of the fourth transistor is connected to the control module. The second end of the second relay is grounded. The third end of the second relay is connected to the second end of the transmitting coil. The fourth end of the second relay is connected to the positioning module. The fifth end of the second relay is connected to the wireless power supply module.

7. The wireless power supply device according to claim 1, characterized in that: Also included is a voltage feedback module; The input end of the voltage feedback module is connected to the output end of the positioning module, and the output end of the voltage feedback module is connected to the control module.

8. The wireless power supply device according to claim 1, characterized in that: It also includes a power button, a power indication module and a detection indication module; The power button and the power indication module are connected to a power supply, and the detection indication module is connected to the control module.

9. The wireless power supply device according to any one of claims 1 to 8, characterized in that: Also includes a housing; The transmitting coil, the control module, the switch module, the positioning module, the wireless power supply module, the voltage feedback module, the power button, the power indication module and the detection indication module are arranged inside the shell, and the front side of the shell includes an opening for observing the status of the power indication module and the detection indication module.

10. A wireless power supply method, characterized in that: The wireless power supply device includes a transmitting coil, a control module, a switch module, a positioning module and a wireless power supply module; The wireless power supply method comprises: The switch module is in a first conducting state according to a control signal of the control module; When the switch module is in a first conducting state, the positioning module is connected to the transmitting coil and changes the output voltage of the positioning module; The switch module is in a second conducting state according to a control signal of the control module; When the switch module is in the second conducting state, the wireless power supply module is connected to the transmitting coil to wirelessly supply power to the device to be powered.

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