Wireless charging receiver manufacturing method and neural stimulator

Abstract

The present application relates to a method for manufacturing a wireless charging receiver and a neural stimulator, which includes the following steps: a. manufacturing a mold, processing the lower part of the side wall of the mold cavity into a shape that matches the coil body; b. placing the PCBA in the lower part of the cavity; c. pouring a mixture into the cavity, the mixture comprising mixed magnetic isolation powder and a binder, the viscosity of the binder satisfying: when the temperature is T, during the natural curing process of the binder, the magnetic isolation powder settles to the lower part of the cavity; waiting for the binder to cure naturally under the environment of temperature T; d. removing the part of the mixture except the magnetic isolation part to expose the connection area, winding the receiving coil against the outer wall of the magnetic isolation part, and fixing the two ends of the receiving coil to the connection area. The wireless charging receiver manufacturing method can eliminate the gap between the magnetic isolation part and each turn of the receiving coil, and improve the energy conversion efficiency of the wireless charging receiver.

Description

Technical Field

[0001] The present application relates to the field of wireless charging technology, and in particular to a method for manufacturing a wireless charging receiver and a neural stimulator. Background Art

[0002] Wireless charging eliminates the reliance on traditional charging cables. Electronic devices can be charged by simply placing them on the charger or bringing them close to the charger. This reduces the hassle of plugging and unplugging cables, improves the user experience, and enables electronic devices that cannot be charged by wires (such as neurostimulators implanted in the human body) to be charged remotely. Therefore, more and more electronic devices are being charged wirelessly.

[0003] The wireless charging system includes a wireless charging transmitter and a wireless charging receiver. The wireless charging transmitter is provided with a transmitting coil, and the wireless charging receiver includes a PCBA and a receiving coil. The transmitting coil generates magnetic field energy when it is energized, and the receiving coil receives the magnetic field energy and converts it into alternating current. The PCBA (Printed Circuit Board Assembly) converts the alternating current into the direct current required for charging electronic devices.

[0004] For the convenience of the following description, the following definition is made: the efficiency of the wireless charging receiver in converting the magnetic field energy generated by the transmitting coil into alternating current is called the energy conversion efficiency of the wireless charging receiver.

[0005] In order to facilitate carrying or implantation in the human body, electronic devices are now becoming smaller and smaller. As electronic devices become smaller and smaller, the receiving coils inside them are also getting smaller and smaller, which results in a decrease in the ability of the receiving coils to receive magnetic field energy, and the energy conversion efficiency of the wireless charging receiver is therefore reduced. When the energy conversion efficiency of the wireless charging receiver drops to a certain level, the wireless charging speed is extremely slow and cannot meet the user's demand for fast charging. In order to make electronic devices smaller and meet the user's demand for fast charging, it is necessary to increase the energy conversion efficiency of the wireless charging receiver as much as possible.

[0006] In a wireless charging receiver, a magnetic isolation layer is usually provided between the PCBA and the receiving coil. The magnetic isolation layer covers the PCBA, and the receiving coil is wound around the outside of the magnetic isolation layer. The magnetic isolation layer can concentrate and guide the magnetic field, play a magnetic attraction role, and enable the receiving coil to more effectively capture and utilize the magnetic field energy transmitted from the transmitting coil, thereby improving the energy conversion efficiency of the wireless charging receiver.

[0007] The inventor of the present application discovered through experiments that: when other conditions remain unchanged (such as the weight of the magnetic isolation layer remains unchanged, and the relative position between the receiving coil and the transmitting coil remains unchanged), the smaller the space between the magnetic isolation layer and the receiving coil, the higher the energy conversion efficiency of the wireless charging receiver. However, in the prior art, the magnetic isolation layer is usually assembled from a plurality of die-cast magnetic isolation sheets, and the outer side of such a magnetic isolation layer is planar. When the receiving coil has a curved surface feature (for example, when the receiving coil is wound along a cylindrical spiral line into a cylindrical spiral structure), there is a large space between the magnetic isolation layer and the receiving coil, resulting in a low energy conversion efficiency of the wireless charging receiver, which is not conducive to making the electronic device smaller. Summary of the invention

[0008] Based on this, it is necessary to provide a wireless charging receiver manufacturing method and a neurostimulator to address the above problems. In the wireless charging receiver manufactured using the wireless charging receiver manufacturing method, the magnetic isolation member and each circle of the receiving coil are attached together, thereby eliminating the gap between the magnetic isolation member and each circle of the receiving coil, thereby improving the energy conversion efficiency of the wireless charging receiver.

[0009] In order to solve the above problems, the present application provides the following technical solutions:

[0010] A method for manufacturing a wireless charging receiver, the wireless charging receiver comprising a PCBA, a magnetic shielding member and a receiving coil, the PCBA being used to control and adjust electrical signals, the PCBA comprising a PCB and electronic components, the PCB being provided with an installation area and a connection area, the electronic components being fixedly arranged in the installation area, and the connection area being fixedly connected to one end of the installation area; the magnetic shielding member being a tubular structure, the electronic components and the installation area being located inside the magnetic shielding member; the receiving coil comprising a coil body and pins connected to both ends of the coil body, the pins being electrically connected to the connection area, and the coil body being closely wound around the outer wall surface of the magnetic shielding member; the method for manufacturing a wireless charging receiver comprising the following steps:

[0011] a. manufacturing a mold, processing the lower part of the side wall of the mold cavity into a shape that matches the coil body to be manufactured;

[0012] b. Placing the PCBA at the lower part of the cavity;

[0013] c. pouring a mixture into the cavity, wherein the mixture comprises magnetic insulation powder and a binder mixed together, and the viscosity of the binder satisfies: when the temperature is T, during the natural curing process of the binder, the magnetic insulation powder settles to the lower part of the cavity; the amount of the mixture poured into the cavity satisfies: the magnetic insulation powder settled to the lower part of the cavity completely wraps the installation area and the electronic components and is located below the connection area; waiting for the binder to cure naturally in an environment with a temperature of T, after the binder cures, the part of the mixture located at the lower part of the cavity forms the magnetic insulation member; and

[0014] d. Separate the mixture from the mold, remove the portion of the mixture except the magnetic isolation member to expose the connection area, wind the receiving coil along the outer wall of the magnetic isolation member, and fix the two ends of the receiving coil to the connection area.

[0015] The wireless charging receiver manufacturing method has at least the following beneficial effects:

[0016] The wireless charging receiver is manufactured by the first wireless charging receiver manufacturing method. No matter what the shape of the receiving coil is, as long as the lower part of the side wall of the mold cavity is processed into a shape that matches the receiving coil in step a, the outer wall surface of the magnetic isolation member can be made into a shape that matches the receiving coil, and then the receiving coil is wound along the outer wall surface of the magnetic isolation member, so that each circle of the receiving coil can be attached to the outer wall surface of the magnetic isolation member, thereby eliminating the gap between the magnetic isolation member and each circle of the receiving coil, and improving the energy conversion efficiency of the wireless charging receiver. Moreover, the magnetic isolation powder settles and accumulates together, so in the manufactured magnetic isolation member, the mass percentage of the magnetic isolation powder can be greater than or equal to 90%, which makes the magnetic isolation member have excellent magnetic attraction and magnetic isolation functions, and can improve the energy conversion efficiency of the wireless charging receiver. In addition, the receiving coil of the desired shape can be wound along the outer wall surface of the magnetic isolation member. In other words, the magnetic isolation member plays the role of a coil mold, so that there is no need to manufacture an additional coil mold as a basis for winding the receiving coil before manufacturing the receiving coil.

[0017] In one embodiment, the magnetic isolation powder is ferrite powder, the binder is epoxy resin, 5°C≤T≤40°C; the viscosity of the binder is η, when the temperature is T, 50cps≤η≤500cps.

[0018] In this arrangement, since the viscosity of the binder is relatively low, the magnetic isolation powder can settle to the bottom of the cavity and accumulate together.

[0019] In one embodiment, the method further includes the following steps before step b:

[0020] e. A protective member is fixedly arranged on the surface of the installation area and the electronic component, so that the protective member completely covers the installation area and the electronic component.

[0021] Such an arrangement can protect the mounting area and the electronic components, and prevent the mounting area and the electronic components from being adversely affected in step c.

[0022] In one embodiment, step e includes the following steps:

[0023] e1. Infusing protective material on the installation area and the surface of the electronic components, and forming the protective member after the protective material is cured.

[0024] Such an arrangement facilitates the protective member to completely cover the installation area and the electronic components.

[0025] In one embodiment, the protective material is epoxy resin or polyurethane.

[0026] With such arrangement, the protective member formed has good insulation and moisture-proof properties and can well protect the installation area and electronic components.

[0027] In one embodiment, step e includes the following steps:

[0028] e2. Coating a protective material on the installation area and the surface of the electronic components, and forming the protective member after the protective material is cured.

[0029] With such an arrangement, the protective member can be made very thin, which is conducive to manufacturing a small wireless charging receiver.

[0030] In one embodiment, the protective material is conformal coating or parylene.

[0031] With such arrangement, the protective member formed has good insulation and moisture-proof properties and can well protect the installation area and electronic components.

[0032] In one embodiment, the method further includes the following steps before step c:

[0033] f. Evenly mix the magnetic isolation powder and the binder in the mixture.

[0034] Such an arrangement can shorten the time required for the magnetic powder to settle to the lower part of the cavity in step c.

[0035] The present application also provides another method for manufacturing a wireless charging receiver, the wireless charging receiver comprising a PCBA, a magnetic shielding member and a receiving coil, the PCBA being used to control and adjust electrical signals, the PCBA comprising a PCB and electronic components, the PCB being provided with an installation area and a connection area, the electronic components being fixedly arranged in the installation area, and the connection area being fixedly connected to one end of the installation area; the magnetic shielding member being a tubular structure, the magnetic shielding member being composed of two shell-like bodies, the two shell-like bodies being fixedly connected together and jointly enclosing a receiving cavity, the electronic components and the installation area being located in the magnetic shielding member; the receiving coil comprising a coil body and pins connected to both ends of the coil body, the pins being electrically connected to the connection area, and the coil body being closely wound around the outer wall surface of the magnetic shielding member; the method for manufacturing a wireless charging receiver comprising the following steps:

[0036] a. manufacturing two molds, and processing the lower parts of the cavities of the two molds into shapes that match the two shell-like bodies to be manufactured;

[0037] b. Pour a mixture into the cavity, wherein the mixture comprises magnetic isolation powder and a binder mixed together; the viscosity of the binder satisfies that: when the temperature is T, during the natural curing process of the binder, the magnetic isolation powder settles to the lower part of the cavity; the amount of the mixture poured into the cavity satisfies that: the magnetic isolation powder that settles to the lower part of the cavity fills the lower part of the cavity; wait for the binder to cure naturally in an environment at a temperature of T, and after the binder cures, the part of the mixture located at the lower part of the cavity forms a magnetic isolation piece;

[0038] c. placing the installation area and the electronic components between the two shell-like bodies, so that the connection area is located outside the two shell-like bodies, and then fixing and connecting the two shell-like bodies to assemble the magnetic isolation member;

[0039] d. Wind the receiving coil close to the outer wall of the magnetic isolation component, and fix the two ends of the receiving coil to the connection area.

[0040] The wireless charging receiver manufacturing method has at least the following beneficial effects:

[0041] The wireless charging receiver is manufactured by the second wireless charging receiver manufacturing method. No matter what the shape of the receiving coil is, as long as the outer side of the lower part of the mold cavity is processed into a shape that matches the coil body in step a, the outer wall surface of the magnetic isolation member can be made into a shape that matches the receiving coil, and then the receiving coil is wound along the outer wall surface of the magnetic isolation member, so that each circle of the receiving coil can be attached to the outer wall surface of the magnetic isolation member, thereby eliminating the gap between the magnetic isolation member and each circle of the receiving coil, and improving the energy conversion efficiency of the wireless charging receiver. Moreover, the magnetic isolation powder settles and accumulates together, so in the manufactured magnetic isolation member, the mass percentage of the magnetic isolation powder can be greater than or equal to 90%, which makes the magnetic isolation member have excellent magnetic attraction and magnetic isolation functions, and can improve the energy conversion efficiency of the wireless charging receiver. In addition, the receiving coil of the desired shape can be wound along the outer wall surface of the magnetic isolation member. In other words, the magnetic isolation member plays the role of a coil mold, so that there is no need to manufacture an additional coil mold as a basis for winding the receiving coil before manufacturing the receiving coil.

[0042] The present application also provides a neural stimulator, which includes a pulse generator, and the pulse generator includes a wireless charging receiver, and the wireless charging receiver is manufactured using any one of the above-mentioned wireless charging receiver manufacturing methods.

[0043] The neurostimulator has at least the following beneficial effects:

[0044] By manufacturing a wireless charging receiver using any of the above-mentioned wireless charging receiver manufacturing methods, the gap between the magnetic isolation member and each coil of the receiving coil can be eliminated, the energy conversion efficiency of the wireless charging receiver can be improved, and it is beneficial to make the neurostimulator smaller. Moreover, the receiving coil of the desired shape can be wound by sticking to the outer wall of the magnetic isolation member. In other words, the magnetic isolation member plays the role of a coil mold. In this way, before manufacturing the receiving coil, there is no need to manufacture an additional coil mold as the basis for winding the receiving coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 A three-dimensional schematic diagram of a wireless charging receiver according to an embodiment of the present application;

[0046] Figure 2 for Figure 1 The schematic diagram of the structure of the PCBA in the wireless charging receiver shown;

[0047] Figure 3 for Figure 2 A schematic diagram of a structure formed after a protective component is poured onto the PCBA surface;

[0048] Figure 4 for Figure 3 A schematic diagram of the structure formed after the magnetic isolation member is poured into the surface of the structure shown;

[0049] Figure 5 This is a schematic diagram of the positional relationship between the PCBA, the protective component and the mold in the wireless charging receiver manufacturing method according to an embodiment of the present application.

[0050] Reference numerals:

[0051] 1. PCBA; 11. PCB; 111. Installation area; 112. Connection area; 12. Electronic components; 2. Magnetic isolation parts; 3. Receiving coil; 31. Coil body; 4. Protective parts; 5. Mold; 51. Cavity; 52. Glue channel; 6. Glue spray head. DETAILED DESCRIPTION

[0052] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0053] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0054] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0055] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0056] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0057] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0058] This application first discloses a method for manufacturing a wireless charging receiver. Figure 1 and Figure 2 The wireless charging receiver manufactured by the first wireless charging receiver manufacturing method includes PCBA1, magnetic shielding member 2 and receiving coil 3. PCBA1 is used to control and adjust electrical signals. PCBA1 includes PCB11 and electronic components 12. PCB11 is provided with an installation area 111 and a connection area 112. The electronic component 12 is fixedly arranged in the installation area 111, and the connection area 112 is fixedly connected to one end of the installation area 111. The magnetic shielding member 2 is a tubular structure, and the electronic component 12 and the installation area 111 are located in the magnetic shielding member 2. The receiving coil 3 includes a coil body 31 and pins connected to both ends of the coil body 31. The pins are electrically connected to the connection area 112, and the coil body 31 is tightly wound around the outer wall of the magnetic shielding member 2. The first wireless charging receiver manufacturing method includes the following steps:

[0059] S110, manufacturing the mold 5, processing the lower part of the side wall of the cavity 51 of the mold 5 into a shape that matches the coil body 31 to be manufactured;

[0060] S120, see Figure 5 , placing PCBA1 at the lower part of cavity 51;

[0061] S130, pouring a mixture into the mold cavity 51, the mixture comprising magnetic isolation powder and a binder mixed together, the viscosity of the binder satisfying that: when the temperature is T, during the natural curing process of the binder, the magnetic isolation powder settles to the lower part of the mold cavity 51; the amount of the mixture poured into the mold cavity 51 satisfies that: the magnetic isolation powder settled to the lower part of the mold cavity 51 completely wraps the installation area 111 and the electronic components 12 and is located below the connection area 112; waiting for the binder to cure naturally in an environment with a temperature of T, after the binder is cured, the part of the mixture located at the lower part of the mold cavity 51 forms a magnetic isolation member 2; and

[0062] S140, see Figure 4 , separating the mixture from the mold 5, and removing the portion of the mixture except the magnetic shielding member 2 to expose the connection area 112; Figure 1 The receiving coil 3 is wound along the outer wall of the magnetic isolation member 2, and the two ends of the receiving coil 3 are fixedly connected to the connection area 112; wherein, the part of the receiving coil 3 that is attached to the magnetic isolation member 2 forms a coil body 31, and the two ends of the receiving coil 3 form pins respectively.

[0063] The wireless charging receiver is manufactured by the first wireless charging receiver manufacturing method. No matter what the shape of the receiving coil 3 is, as long as the lower part of the side wall of the cavity 51 of the mold 5 is processed into a shape that matches the receiving coil 3 in step S110, the outer wall surface of the magnetic isolation member 2 can be made into a shape that matches the receiving coil 3. Then, the receiving coil 3 is wound along the outer wall surface of the magnetic isolation member 2, so that each circle of the receiving coil 3 can be attached to the outer wall surface of the magnetic isolation member 2, thereby eliminating the gap between the magnetic isolation member 2 and each circle of the receiving coil 3, and improving the energy conversion efficiency of the wireless charging receiver. Moreover, the magnetic isolation powder settles and accumulates together, so in the manufactured magnetic isolation member 2, the mass percentage of the magnetic isolation powder can be greater than or equal to 90%, which makes the magnetic isolation member 2 have excellent magnetic attraction and magnetic isolation functions, and can improve the energy conversion efficiency of the wireless charging receiver. In addition, the receiving coil 3 of the desired shape can be wound along the outer wall of the magnetic isolation member 2. In other words, the magnetic isolation member 2 plays the role of the coil mold 5. In this way, there is no need to additionally manufacture the coil mold 5 as a basis for winding the receiving coil 3 before manufacturing the receiving coil 3.

[0064] exist Figure 5 In the embodiment, the glue channel 52 is connected with the mold cavity 51 , and the mixture is poured into the glue channel 52 through the glue spray head 6 , and flows into the mold cavity 51 through the glue channel 52 .

[0065] Preferably, the magnetic isolation powder is ferrite powder, the binder is epoxy resin, 5°C≤T≤40°C, the viscosity of the binder is η, and when the temperature is T, 50cps≤η≤500cps. In this way, because the viscosity of the binder is relatively low, the magnetic isolation powder can settle to the lower part of the cavity 51 and accumulate together.

[0066] Preferably, before step S120, the method further includes the following steps: S150, referring to Figure 3 The protective member 4 is fixedly arranged on the surface of the mounting area 111 and the electronic components 12, so that the protective member 4 completely covers the mounting area 111 and the electronic components 12. In this way, the mounting area 111 and the electronic components 12 can be protected and prevented from being adversely affected in step S130.

[0067] In some embodiments, step S150 includes the following steps: S151, pouring protective material on the surface of the mounting area 111 and the electronic components 12, and forming a protective member 4 after the protective material is cured, so that the protective member 4 can completely cover the mounting area 111 and the electronic components 12. In these embodiments, preferably, the protective material is epoxy resin or polyurethane, so that the formed protective member 4 has good insulation and moisture-proof properties, and can well protect the mounting area 111 and the electronic components 12.

[0068] In some embodiments, step S150 includes the following steps: S152, coating the surface of the mounting area 111 and the electronic components 12 with protective materials, and forming the protective member 4 after curing the protective materials, so that the protective member 4 can be made very thin, which is conducive to manufacturing a small wireless charging receiver. In these embodiments, preferably, the protective material is a three-conformal paint or parylene, so that the formed protective member 4 has good insulation and moisture-proof properties, and can well protect the mounting area 111 and the electronic components 12.

[0069] In some embodiments, in order to shorten the time required for the magnetic isolation powder to settle to the lower part of the cavity 51 in step S130, the following step is further included before step S130: S160, uniformly mixing the magnetic isolation powder and the binder in the mixture.

[0070] The present application secondly provides a second method for manufacturing a wireless charging receiver. The wireless charging receiver manufactured by the second method for manufacturing a wireless charging receiver includes a PCBA1, a magnetic shielding member 2 and a receiving coil 3. The PCBA1 is used to control and adjust electrical signals. The PCBA1 includes a PCB11 and an electronic component 12. The PCB11 is provided with an installation area 111 and a connection area 112. The electronic component 12 is fixedly arranged in the installation area 111, and the connection area 112 is fixedly connected to one end of the installation area 111. The magnetic shielding member 2 is a tubular structure. The magnetic shielding member 2 is composed of two shell-like bodies. The two shell-like bodies are fixedly connected together and jointly enclose a receiving cavity. The electronic component 12 and the installation area 111 are located in the magnetic shielding member 2. The receiving coil 3 includes a coil body 31 and pins connected to both ends of the coil body 31. The pins are electrically connected to the connection area 112. The coil body 31 is tightly wound around the outer wall of the magnetic shielding member 2. The second method for manufacturing a wireless charging receiver includes the following steps:

[0071] S210, manufacturing two molds 5, and processing the lower parts of the cavities 51 of the two molds 5 into shapes that match the two shell-like bodies to be manufactured;

[0072] S220, pouring a mixture into the mold cavity 51, the mixture comprising magnetic isolation powder and a binder mixed together; the viscosity of the binder satisfies: when the temperature is T, during the natural curing process of the binder, the magnetic isolation powder settles to the lower part of the mold cavity 51; the amount of the mixture poured into the mold cavity 51 satisfies: the magnetic isolation powder settled to the lower part of the mold cavity 51 fills the lower part of the mold cavity 51; waiting for the binder to cure naturally in an environment with a temperature of T, after the binder is cured, the part of the mixture located at the lower part of the mold cavity 51 forms a magnetic isolation member 2;

[0073] S230, placing the installation area 111 and the electronic components 12 between the two shell-shaped bodies, making the connection area 112 outside the two shell-shaped bodies, and then fixing and connecting the two shell-shaped bodies to assemble into a magnetic isolation member 2;

[0074] S240, wind the receiving coil 3 along the outer wall of the magnetic isolation member 2, and fix the two ends of the receiving coil 3 to the connection area 112; wherein, the part of the receiving coil 3 that is attached to the magnetic isolation member 2 forms the coil body 31, and the two ends of the receiving coil 3 form pins respectively.

[0075] The wireless charging receiver is manufactured by the second wireless charging receiver manufacturing method. No matter what the shape of the receiving coil 3 is, as long as the outer side of the lower part of the cavity 51 of the mold 5 is processed into a shape that matches the coil body 31 in step S210, the outer wall surface of the magnetic isolation member 2 can be made into a shape that matches the receiving coil 3. Then, the receiving coil 3 is wound along the outer wall surface of the magnetic isolation member 2, so that each circle of the receiving coil 3 can be attached to the outer wall surface of the magnetic isolation member 2, thereby eliminating the gap between the magnetic isolation member 2 and each circle of the receiving coil 3, and improving the energy conversion efficiency of the wireless charging receiver. Moreover, the magnetic isolation powder settles and accumulates together, so in the manufactured magnetic isolation member 2, the mass percentage of the magnetic isolation powder can be greater than or equal to 90%, which makes the magnetic isolation member 2 have excellent magnetic attraction and magnetic isolation functions, and can improve the energy conversion efficiency of the wireless charging receiver. In addition, the receiving coil 3 of the desired shape can be wound along the outer wall surface of the magnetic isolation member 2. In other words, the magnetic isolation member 2 plays the role of the coil mold 5. In this way, before manufacturing the receiving coil 3, there is no need to manufacture the coil mold 5 as the basis for winding the receiving coil 3.

[0076] Exemplarily, the two shell-shaped bodies are fixedly connected by bonding / clamping.

[0077] Preferably, the magnetic isolation powder is ferrite powder, the binder is epoxy resin, 5°C≤T≤40°C, the viscosity of the binder is η, and when the temperature is T, 50cps≤η≤500cps. In this way, because the viscosity of the binder is relatively low, the magnetic isolation powder can settle to the lower part of the cavity 51 and accumulate together.

[0078] In some embodiments, in order to shorten the time required for the magnetic isolation powder to settle to the lower part of the cavity 51 in step S220, the following step is further included before step S220: S260, uniformly mixing the magnetic isolation powder and the binder in the mixture.

[0079] In the first wireless charger manufacturing method and the second wireless charger manufacturing method, the magnetic isolation powder may also be neodymium iron boron powder or samarium cobalt powder, and the binder may also be polyurethane.

[0080] In the first wireless charger manufacturing method and the second wireless charger manufacturing method, two ends of the receiving coil 3 are bonded / welded to the connection area 112 .

[0081] Fully implantable neurostimulators need to stay in the body for a long time to exert a long-term therapeutic effect. In order to ensure that the neurostimulator can apply electrical stimulation to the body for many years, it is necessary to wirelessly charge these neurostimulators through the skin and other tissues of the body. Specifically, a pulse generator is set in the neurostimulator, and the pulse generator includes the above-mentioned wireless charging receiver. A transmitting coil is set in the wireless charging transmitter matched with the pulse generator. The transmitting coil is energized to generate magnetic field energy. The receiving coil of the wireless charging receiver receives the magnetic field energy and converts the magnetic field energy into alternating current. The PCBA converts the alternating current into direct current, and converts the direct current into the electrical stimulation signal required for the neurostimulator to apply electrical stimulation. The magnetic isolation member is arranged between the PCBA and the receiving coil. On the one hand, the magnetic isolation member can concentrate and guide the magnetic field, play a magnetic attraction role, so that the receiving coil can more effectively capture and utilize the magnetic field energy transmitted from the transmitting coil, thereby improving the energy conversion efficiency of the pulse generator. On the other hand, the electromagnetic interference of the PCBA to the receiving coil will cause fluctuations and noise in the electrical stimulation signal output by the neurostimulator, making the electrical stimulation signal unstable. Unstable electrical stimulation signals may not be able to accurately regulate the patient's neural activity, resulting in a decrease in the therapeutic effect. The magnetic shielding component can block the electromagnetic interference of PCBA to the receiving coil, play a magnetic shielding role, and is conducive to the stable output of electrical stimulation signals by the neurostimulator, thereby ensuring the treatment effect.

[0082] Small neurostimulators have the following advantages: easy implantation, less trauma during the implantation process, high safety, and the ability to significantly reduce patient discomfort. These advantages have made the miniaturization of neurostimulators a hot spot in the development of neurostimulators. As neurostimulators become smaller and smaller, the receiving coil inside them is also getting smaller and smaller, which results in a decrease in the ability of the receiving coil to receive magnetic field energy, and the energy conversion efficiency of the wireless charging receiver is therefore reduced. When the energy conversion efficiency of the wireless charging receiver drops to a certain level, the wireless charging receiver cannot provide enough electrical energy, causing the neurostimulator to fail to work properly. Therefore, the energy conversion efficiency of the wireless charging receiver has become an important factor restricting the miniaturization of neurostimulators. In order to make the neurostimulator smaller, it is necessary to increase the energy conversion efficiency of the wireless charging receiver as much as possible.

[0083] The present application also provides a neurostimulator, which includes a pulse generator, and the pulse generator includes a wireless charging receiver, and the wireless charging receiver is made by any of the above-mentioned wireless charging receiver manufacturing methods. By manufacturing a wireless charging receiver by any of the above-mentioned wireless charging receiver manufacturing methods, the gap between the magnetic isolation member 2 and each turn of the receiving coil 3 can be eliminated, and the energy conversion efficiency of the wireless charging receiver can be improved, which is conducive to making the neurostimulator smaller. Moreover, the receiving coil 3 of the desired shape can be wound along the outer wall surface of the magnetic isolation member 2. In other words, the magnetic isolation member 2 plays the role of a coil mold. In this way, before manufacturing the receiving coil 3, there is no need to manufacture an additional coil mold as a basis for winding the receiving coil 3.

[0084] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0085] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of protection of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the scope of protection of the present application. Therefore, the scope of protection of the present application shall be subject to the attached claims.

Claims

1. A method for manufacturing a wireless charging receiver, the wireless charging receiver comprising a PCBA (1), a magnetic shield (2) and a receiving coil (3), the PCBA (1) being used to control and adjust an electrical signal, the PCBA (1) comprising a PCB (11) and an electronic component (12), the PCB (11) being provided with an installation area (111) and a connection area (112), the electronic component (12) being fixedly arranged in the installation area (111), and the connection area (112) being fixedly connected to the installation area (111). 11); the magnetic isolation member (2) is a tubular structure, and the mass percentage of magnetic isolation powder in the magnetic isolation member (2) is greater than or equal to 90%; the electronic component (12) and the installation area (111) are located in the magnetic isolation member (2); the receiving coil (3) comprises a coil body (31) and pins connected to both ends of the coil body (31), the pins are electrically connected to the connection area (112), and the coil body (31) is tightly wound around the outer wall surface of the magnetic isolation member (2); characterized in that The wireless charging receiver manufacturing method comprises the following steps: a. manufacturing a mold (5), and processing the lower portion of the side wall of the cavity (51) of the mold (5) into a shape that matches the coil body (31) to be manufactured; b. placing the PCBA in the lower part of the cavity (51); c. pouring a mixture into the cavity (51), the mixture comprising magnetic isolation powder and a binder mixed together, the viscosity of the binder satisfying that: when the temperature is T, during the natural curing process of the binder, the magnetic isolation powder settles to the lower part of the cavity (51); the amount of the mixture poured into the cavity (51) satisfies that: the magnetic isolation powder settled to the lower part of the cavity (51) completely wraps the installation area (111) and the electronic component (12) and is located below the connection area (112); waiting for the binder to naturally cure in an environment at a temperature of T, after the binder cures, the portion of the mixture located at the lower part of the cavity (51) forms the magnetic isolation member (2); and d. Separating the mixture from the mold (5), removing the portion of the mixture except the magnetic isolation member (2) to expose the connection area (112), winding the receiving coil (3) along the outer wall surface of the magnetic isolation member (2), and fixing the two ends of the receiving coil (3) to the connection area (112).

2. The method for manufacturing a wireless charging receiver according to claim 1, characterized in that: The magnetic isolation powder is ferrite powder, the binder is epoxy resin, 5°C≤T≤40°C; the viscosity of the binder is η, when the temperature is T, 50cps≤η≤500cps.

3. The method for manufacturing a wireless charging receiver according to claim 1, characterized in that: Before step b, the method further comprises the following steps: e. A protective member (4) is fixedly arranged on the surface of the installation area (111) and the electronic component (12), so that the protective member (4) completely covers the installation area (111) and the electronic component (12).

4. The method for manufacturing a wireless charging receiver according to claim 3, characterized in that: Step e includes the following steps: e1. Infusing protective material on the surface of the installation area (111) and the electronic component (12), and forming the protective element (4) after the protective material is cured.

5. The method for manufacturing a wireless charging receiver according to claim 4, characterized in that: The protective material is epoxy resin or polyurethane.

6. The method for manufacturing a wireless charging receiver according to claim 3, characterized in that: Step e includes the following steps: e2. Coating a protective material on the surface of the installation area (111) and the electronic component (12), wherein the protective material is cured to form the protective member (4).

7. The method for manufacturing a wireless charging receiver according to claim 6, characterized in that: The protective material is conformal coating or parylene.

8. The method for manufacturing a wireless charging receiver according to claim 1, characterized in that: Before step c, the method further includes the following steps: f. Evenly mix the magnetic isolation powder and the binder in the mixture.

9. A method for manufacturing a wireless charging receiver, the wireless charging receiver comprising a PCBA (1), a magnetic shielding member (2) and a receiving coil (3), the PCBA (1) being used to control and adjust an electrical signal, the PCBA (1) comprising a PCB (11) and an electronic component (12), the PCB (11) being provided with an installation area (111) and a connection area (112), the electronic component (12) being fixedly arranged in the installation area (111), and the connection area (112) being fixedly connected to one end of the installation area (111); the magnetic shielding member (2) being a tubular structure The magnetic isolation member (2) has a magnetic isolation powder with a mass percentage greater than or equal to 90%; the magnetic isolation member (2) is composed of two shell-like bodies, the two shell-like bodies are fixedly connected together and together enclose a containing cavity, the electronic component (12) and the installation area (111) are located in the magnetic isolation member (2); the receiving coil (3) comprises a coil body (31) and pins connected to both ends of the coil body (31), the pins are electrically connected to the connection area (112), and the coil body (31) is tightly wound around the outer wall surface of the magnetic isolation member (2); the characteristics are as follows: The wireless charging receiver manufacturing method comprises the following steps: a. manufacturing two molds (5), and processing the lower parts of the mold cavities (51) of the two molds (5) into shapes that match the two shell-like bodies to be manufactured; b. pouring a mixture into the mold cavity (51), the mixture comprising magnetic isolation powder and a binder mixed together; the viscosity of the binder satisfies that: when the temperature is T, during the natural curing process of the binder, the magnetic isolation powder settles to the lower part of the mold cavity (51); the amount of the mixture poured into the mold cavity (51) satisfies that: the magnetic isolation powder settled to the lower part of the mold cavity (51) fills the lower part of the mold cavity (51); waiting for the binder to naturally cure in an environment at a temperature of T, after the binder cures, the portion of the mixture located at the lower part of the mold cavity (51) forms a magnetic isolation member (2); c. placing the installation area (111) and the electronic components (12) between the two shell-like bodies, so that the connection is located outside the two shell-like bodies, and then fixing the two shell-like bodies together to assemble the magnetic isolation member (2); d. Winding the receiving coil (3) close to the outer wall surface of the magnetic isolation component (2), and fixing the two ends of the receiving coil (3) to the connection area (112).

10. A neural stimulator, characterized in that: The invention comprises a pulse generator, wherein the pulse generator comprises a wireless charging receiver, and the wireless charging receiver is manufactured by the wireless charging receiver manufacturing method according to any one of claims 1 to 9.

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