Wireless charging base and wireless charging device

Abstract

The utility model discloses a wireless charging base and a wireless charging device, and relates to the technical field of wireless charging. The wireless charging base comprises a fixed base which is provided with a first surface and a second surface which are perpendicular to each other; the circuit board is provided with a wireless charging circuit, and the circuit board is arranged on the first surface; the coil is electrically connected with a wireless charging circuit on the circuit board, and the coil is arranged on the second surface; wherein the wireless charging circuit transmits electric energy to the outside through the coil. The utility model aims to improve the heat dissipation capability of the wireless charging device and reduce electromagnetic resonance.

Description

TECHNICAL FIELD

[0001] The utility model relates to wireless charging technical field, especially relate to a wireless charging base and wireless charging device. BACKGROUND

[0002] With the popularity of portable electronic equipment and the increasing demand for more convenient charging mode, wireless charging technology has just begun to enter the public view. However, the existing wireless charging technology still has different technical difficulties in electromagnetic compatibility, efficiency, temperature rise and other technical aspects.

[0003] The existing wireless charging device is mainly divided into two structures, namely the separated structure and the integrated structure. Among them, the separated structure is to divide the coil and the power conversion unit into two parts, which are respectively arranged at different positions of the wireless charging device, so as to reduce the temperature of the charging base and isolate the electromagnetic resonance effect generated by the coil and the circuit. However, the separated structure has the problems of serious line loss and high frequency radiation. The integrated structure is to arrange the coil and the power conversion unit in parallel at a similar position, so as to reduce the line loss and high frequency radiation of the high frequency circuit in the wire. However, the integrated structure has the problems of high temperature and electromagnetic resonance. Therefore, how to combine the advantages of the two structures has become a technical problem to be solved by the present application. SUMMARY

[0004] The main purpose of the utility model is to provide a wireless charging base and device, which aims to improve the heat dissipation capacity of the wireless charging device and reduce the electromagnetic resonance.

[0005] In order to achieve the above purpose, the wireless charging base provided by the utility model comprises:

[0006] A fixed base, which has a first surface and a second surface arranged perpendicularly to each other on the fixed base;

[0007] A circuit board, which is provided with a wireless charging circuit, and is arranged on the first surface;

[0008] A coil, which is electrically connected with the wireless charging circuit on the circuit board, and is arranged on the second surface;

[0009] Among them, the wireless charging circuit emits electric energy to the outside through the coil.

[0010] In an embodiment, the first surface of the fixed base is provided with a clamping groove, the opening direction of the clamping groove is perpendicular to the first surface, and the circuit board is arranged in the clamping groove.

[0011] In an embodiment, the second surface of the fixed base is provided with an annular groove, the height of the annular groove corresponds to the thickness of the coil, and the coil is arranged in the annular groove.

[0012] In an embodiment, the wireless charging base further comprises a magnetic core, the coil is arranged outside the magnetic core, and the magnetic core is arranged on the first surface.

[0013] In an embodiment, a cylindrical recess is arranged on the first surface of the fixed base, the cylindrical recess is located at the center of the annular recess, the diameter of the cylindrical recess is greater than or equal to the diameter of the magnetic core, and the depth of the cylindrical recess is less than the length of the magnetic core.

[0014] In an embodiment, the distance between the edge of the coil and the circuit board is greater than or equal to 1.5 mm.

[0015] In an embodiment, the wireless charging circuit comprises a voltage conversion circuit and a power supply end, a first end of the voltage conversion circuit is electrically connected to the power supply end, a second end of the voltage conversion circuit is electrically connected to the coil, and the voltage conversion circuit is used to convert an input first voltage into a second voltage and output.

[0016] In an embodiment, the wireless charging circuit further comprises:

[0017] a master control circuit;

[0018] a temperature detection circuit, an output end of the temperature detection circuit is electrically connected to the master control circuit, and the temperature detection circuit is used to output a temperature detection signal;

[0019] a switch circuit, an input end of the switch circuit is electrically connected to the power supply end, an output end of the switch circuit is electrically connected to an input end of the voltage conversion circuit, and a controlled end of the switch circuit is electrically connected to the master control circuit;

[0020] wherein the master control circuit is used to control the switch circuit to turn on or turn off a path between the power supply end and the voltage conversion circuit according to the temperature detection signal.

[0021] The utility model further provides a wireless charging device, the wireless charging device includes power adapter and like any one of the above wireless charging base.

[0022] The utility model discloses a technical scheme through circuit board and coil are set up respectively in the first surface and the second surface of fixed base. Among them, the first surface and the second surface are perpendicular to each other. Therefore, the circuit board and the coil are also in the perpendicular setting relation. When the wireless charging base works, the coil generates the alternating magnetic field through the high frequency alternating current output of the circuit board, and through the perpendicular setting of the circuit board and the coil, the problem of the magnetic field formed by the coil and the electromagnetic resonance formed by the circuit board can be effectively reduced. In addition, the circuit board and the coil are vertically arranged, the space between the circuit board and the coil is expanded, and the heat dissipation effect of the wireless charging base is improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to the structure shown in these drawings without creative labor.

[0024] Figure 1 It is the structural diagram of the wireless charging base of the utility model;

[0025] Figure 2 It is the module schematic view of one embodiment of the wireless charging base of the utility model.

[0026] Explanation of reference numerals:

[0027] 10, fixed base;20, circuit board;21, voltage conversion circuit;22, main control circuit;23, temperature detection circuit;24, switch circuit;30, coil;40, magnetic core.

[0028] The realization, functional characteristics and advantages of the utility model will be further explained by combining with the embodiments and referring to the drawings. DETAILED DESCRIPTION

[0029] The technical scheme in the embodiments of the utility model will be clearly and completely described below by combining with the drawings in the embodiments of the utility model, obviously, the described embodiments are only a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0030] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the utility model are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain posture (as shown in the drawings), if the certain posture changes, the directional indications also change accordingly.

[0031] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implying the number of the indicated technical features. Therefore, the features limited by "first" and "second" can be explicitly or implicitly included at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the present application.

[0032] With the popularity of portable electronic devices and the increasing demand for more convenient charging methods, wireless charging technology has begun to enter the public eye. However, the existing wireless charging technology still has different technical difficulties in electromagnetic compatibility, efficiency, temperature rise and other technical aspects.

[0033] The existing wireless charging device is mainly divided into two structures, separated structure and integrated structure. Among them, the separated structure is to divide the coil 30 and the power conversion unit into two parts, which are respectively arranged at different positions of the wireless charging device, so as to reduce the temperature of the charging base and isolate the electromagnetic resonance effect generated by the coil 30 and the circuit. However, the separated structure has the problems of serious line loss and high frequency radiation. The integrated structure is to arrange the coil 30 and the power conversion unit in parallel at a similar position, so as to reduce the line loss and high frequency radiation of the high frequency circuit in the wire. However, the integrated structure has the problems of high temperature and electromagnetic resonance. Therefore, how to combine the advantages of the two structures has become a technical problem to be solved by the present application.

[0034] Therefore, with reference to Figure 1 The utility model provides a wireless charging base, the wireless charging base includes:

[0035] The fixed base 10 has a first surface and a second surface arranged perpendicular to each other on the fixed base 10;

[0036] The circuit board 20 is provided with a wireless charging circuit, and the circuit board 20 is arranged on the first surface;

[0037] The coil 30 is electrically connected with the wireless charging circuit on the circuit board 20, and the coil 30 is arranged on the second surface;

[0038] The wireless charging circuit emits electric energy to the outside through the coil 30.

[0039] In the embodiment, the fixed base 10 can be made of plastic, composite material, metal, etc. Different materials can be used for different structures of the fixed base 10. Different materials can be selected for different structures of the fixed base 10 to effectively meet the actual needs of the corresponding structure. For example, the main structure of the fixed base 10 is made of plastic or composite material to reduce the overall weight of the wireless charging base. For example, the fixed base 10 also includes a heat dissipation structure, which can be made of a metal material with high thermal conductivity. Further, the specific shape of the fixed base 10 can be set according to actual needs. However, the fixed base 10 needs to be provided with two mutually perpendicular first and second surfaces. The first surface is used to set the circuit board 20, and the second surface is used to set the coil 30. By setting the fixed base 10 to have two mutually perpendicular surfaces, the circuit board 20 and the coil 30 are set in the fixed base 10, and the process of being perpendicular to each other is naturally formed. It can be understood that the fixed base 10 can be manufactured by one-piece molding, and corresponding mounting slots are reserved to facilitate the assembly of other components on the fixed base 10.

[0040] In the embodiment, the circuit board 20 has a corresponding connection and mounting structure to facilitate the mounting and fixing of the circuit board 20 and the first surface of the fixed base 10. For example, when the fixed base 10 is provided with a clamping groove corresponding to the size of the circuit board 20 on the first surface, the circuit board 20 needs to be provided with a corresponding clamping groove docking structure. Or the fixed base 10 is provided with a screw hole on the first surface, and the circuit board 20 needs to be provided with a corresponding screw hole to realize connection and fixing by screws. The circuit board 20 is provided with a wireless charging circuit, which converts the direct current input by the power supply into high-frequency alternating current and outputs it to the coil 30 to make the coil 30 generate an alternating magnetic field, thereby emitting electric energy to the outside. Further, the wireless charging circuit includes but is not limited to rectifier circuit, inverter circuit, protection circuit, drive circuit, and switch circuit 24 to convert household 220V alternating current into high-frequency alternating current required by the coil 30 and output, and realize the protection function of the circuit work.

[0041] In the embodiment, the coil 30 can be selected according to actual needs, for example, circular, square and the like. In the embodiment, the circular structure is the optimal implementation scheme. The circular coil 30 can provide better magnetic field distribution, so that the device can be effectively charged within a certain range. Further, in order to reduce the resistance loss and improve the charging efficiency, the coil 30 is preferably made of copper. In addition, in order to prevent short circuit between the coils 30, an insulating paint can be arranged on the surface of the coil 30. The coil 30 can be designed according to the actual needs and the size of the mounting area of the second surface of the fixed base 10. The number of turns of the coil 30 directly affects the magnetic field strength and the energy transmission efficiency. It can be understood that the more the number of turns of the coil 30, the greater the magnetic field strength, but at the same time, it can also increase the resistance loss, thereby causing the increase of heat. In addition, the single-layer coil 30 structure is simple and easy to manufacture. However, in the case of high efficiency, a multi-layer coil 30 can be used to improve the magnetic field strength.

[0042] In the embodiment, the circuit board 20 and the coil 30 are arranged on the first surface and the second surface of the fixed base 10 respectively. The first surface and the second surface are perpendicular to each other. Therefore, the circuit board 20 and the coil 30 are also arranged in a perpendicular relationship. When the wireless charging base is working, the coil 30 generates an alternating magnetic field by obtaining the high-frequency alternating current output by the circuit board 20. By arranging the circuit board 20 and the coil 30 vertically, the problem of electromagnetic resonance between the magnetic field formed by the coil 30 and the circuit board 20 can be effectively reduced. In addition, by arranging the circuit board 20 and the coil 30 vertically, the space between the circuit board 20 and the coil 30 is expanded, so that the heat dissipation effect of the wireless charging base is improved.

[0043] In an embodiment of the utility model, the first surface of the fixed base 10 is provided with a clamping groove, the opening direction of the clamping groove is perpendicular to the first surface, and the circuit board 20 is arranged in the clamping groove.

[0044] In the embodiment, the first surface of the fixed base 10 is provided with a clamping groove to fixedly mount the circuit board 20. The width of the clamping groove corresponds to the width of the circuit board 20, so that the reserved clamping area of the circuit board 20 can be directly connected with the clamping groove. In actual production and manufacturing, the fixed base 10 and the circuit board 20 are produced and manufactured respectively, and then combined through subsequent assembly. The clamping groove arranged on the first surface of the fixed base 10 can directly dock and fix the circuit board 20, effectively improving the efficiency of the assembly process.

[0045] Optionally, the second surface of the fixed base 10 is provided with an annular groove, the height of the annular groove corresponds to the thickness of the coil 30, and the coil 30 is arranged in the annular groove.

[0046] In the embodiment, the second surface of the fixed base 10 is provided with an annular groove corresponding to the size of the coil 30. It can be understood that the coil 30 is an annular coil 30 at this time. The inner ring diameter and the outer ring diameter of the annular groove correspond to the diameter of the inner ring and the diameter of the outer ring of the annular coil 30. In addition, the height of the annular groove also corresponds to the thickness of the coil 30. Therefore, by installing the coil 30 in the annular groove, the periphery of the annular coil 30 can be fixed corresponding to the fixed base 10. The two ends of the coil 30 are respectively welded with the output end of the circuit board 20, and the fixation is further realized.

[0047] Further, the wireless charging base further comprises a magnetic core 40, the coil 30 is arranged outside the magnetic core 40, and the magnetic core 40 is arranged on the first surface.

[0048] In the embodiment, the magnetic core 40 can help concentrate and guide the magnetic field, thereby improving the coupling coefficient between the transmitting coil 30 and the receiving coil 30. Higher coupling coefficient means higher energy transmission efficiency, reducing energy loss. In addition, the magnetic core 40 can also reduce electromagnetic interference, so that the influence of the wireless charging system on external devices is minimized when working. In addition, the magnetic core 40 can make the magnetic field distribution more uniform, so that effective charging can be realized even if the device is not in a completely aligned position. The first surface of the fixed base 10 is provided with a cylindrical groove, the cylindrical groove is located at the center of the annular groove, the diameter of the cylindrical groove is greater than or equal to the diameter of the magnetic core 40, and the depth of the cylindrical groove is less than the length of the magnetic core 40. The buckle structure is arranged in the cylindrical groove, and the magnetic core 40 is fixed after being inserted into the cylindrical groove. In addition, the wireless charging base further comprises a shell, and the top of the part of the magnetic core 40 exposed outside the fixed base 10 corresponds to the abutment of the shell. It can be understood that the length of the magnetic core 40 is greater than the thickness of the coil 30, that is, in the actual arrangement, the coil 30 is located in the middle of the magnetic core 40, so as to maximize the reduction of the diffusion of the magnetic field and improve the energy transmission efficiency.

[0049] In an embodiment of the utility model, the distance between the edge of the coil 30 and the circuit board 20 is greater than or equal to 1.5 millimeters.

[0050] In this embodiment, when the wireless charging base is working, and the coil 30 is arranged in parallel with the driving circuit board 20, after the receiving device is placed on the coil 30, the load of the coil 30 will change. Due to the change of the load, the resonance condition of the transmitting coil 30 may change, and needs to be retuned by adjusting the tuning capacitor or other parameters in the wireless charging circuit. In addition, the coil 30 will generate a strong alternating magnetic field when working, which will cause interference to the sensitive electronic elements on the circuit board 20, that is, electromagnetic interference. The electromagnetic interference will cause the signal on the circuit board 20 to be unstable, thereby affecting the normal work of the circuit. Further, the coil 30 will heat when working, and if the coil 30 is arranged in parallel with the circuit board 20 and the distance is close, it may cause the elements on the driving circuit board 20 to overheat. Overheating may affect the service life of the elements on the circuit board 20, and even cause failure or damage. Therefore, the coil 30 is arranged perpendicular to the circuit board 20 in the utility model. The distance between the circuit board 20 and the edge of the coil 30 will directly affect the degree of electromagnetic interference, the heat dissipation efficiency, and the compactness and reliability of the overall design. Therefore, in order to avoid the influence of the alternating magnetic field generated by the coil 30 on the circuit board 20 when the wireless charging base is working, the distance between the circuit board 20 and the edge of the coil 30 needs to be greater than or equal to 1.5mm.

[0051] Reference Figure 2 In an embodiment of the utility model, the wireless charging circuit includes a voltage conversion circuit 21 and a power supply end, the first end of the voltage conversion circuit 21 is electrically connected with the power supply end, the second end of the voltage conversion circuit 21 is electrically connected with the coil 30, and the voltage conversion circuit 21 is used to convert the input first voltage into second voltage and output.

[0052] In this embodiment, the voltage conversion circuit 21 can be realized by using a rectifier circuit and an inverter circuit. When the wireless charging base is provided with a corresponding power adapter, that is, the power supply end of the wireless charging circuit inputs a direct current voltage, the voltage conversion circuit 21 can only include an inverter circuit. When the voltage input by the power supply end is a direct current voltage, the first voltage is a direct current voltage. The voltage conversion circuit 21 outputs high-frequency alternating current by inverting the direct current voltage through the inverter circuit and outputs to the coil 30. Further, the inverter circuit in the voltage conversion circuit 21 needs to correspond to the design of the coil 30 to invert the input direct current voltage into high-frequency alternating current. The frequency of the high-frequency alternating current output by the voltage conversion circuit 21 needs to match the self-resonance frequency of the coil 30. In addition, the coil 30 and the surrounding capacitance form an LC oscillation circuit, which has a self-resonance frequency. The frequency output by the voltage conversion circuit 21 should be as close as possible to this self-resonance frequency to improve the efficiency.

[0053] Reference Figure 2In an embodiment of the present application, the wireless charging circuit further comprises:

[0054] The main control circuit 22;

[0055] The temperature detection circuit 23, an output end of the temperature detection circuit 23 is electrically connected with the main control circuit 22, and the temperature detection circuit 23 is used for outputting a temperature detection signal;

[0056] The switch circuit 24, an input end of the switch circuit 24 is electrically connected with the power supply end, an output end of the switch circuit 24 is electrically connected with an input end of the voltage conversion circuit 21, and a controlled end of the switch circuit 24 is electrically connected with the main control circuit 22;

[0057] The main control circuit 22 is used for controlling the switch circuit 24 to turn on or turn off the passageway between the power supply end and the voltage conversion circuit 21 according to the temperature detection signal.

[0058] In the embodiment, the main control circuit 22 can be realized by a main controller, for example, a SOC (System On Chip), an MCU (Microcontroller Unit), a DSP (Digital Signal Process), an FPGA (Field Programmable Gate Array) and the like.

[0059] In the embodiment, the temperature detection circuit 23 can be realized by a detection circuit based on a thermal sensitive device, for example, a resistance voltage division circuit based on an NTC resistance or an NTC probe, a resistance voltage division circuit based on a PTC resistance or a PTC probe. Alternatively, the temperature detection circuit 23 can also be realized by a temperature sensor, for example, an infrared temperature sensor, a thermocouple temperature sensor and the like. The temperature detection circuit 23 can be multiple, and the multiple temperature detection circuits 23 can be arranged at different positions of the wireless charging base. The main control circuit 22 can determine multiple temperature values according to the multiple temperature detection signals, and calculate an actual environmental temperature by a preset temperature algorithm, for example, an average value, a weighted calculation and the like, so as to improve the accuracy of detection of the working temperature of the wireless charging base.

[0060] In the embodiment, the switch circuit 24 can be implemented by at least one switch tube, such as a MOS tube, an IGBT tube, a thyristor, a triode, a power tube, etc. The main control circuit 22 controls the switch circuit 24 to be in a conducting state or a closed state according to the temperature value obtained through the temperature detection signal and according to a preset control logic, so that the voltage conversion circuit 21 is powered on or powered off in actual application. For example, the developer sets a preset alarm temperature in the main control circuit 22 during development. If the circuit module in the wireless charging base malfunctions and causes heating, the temperature around the wireless charging base, i.e., the working temperature described above, will increase and exceed the preset alarm temperature. Thus, in the actual working process, when the main control circuit 22 determines that the current working temperature reaches the preset alarm temperature according to the temperature detection signal, it is confirmed that the current wireless charging base malfunctions and overheats, and the switch circuit 24 is controlled to be in an open state to make the voltage conversion circuit 21 powered off, effectively ensuring the safety of the wireless charging base.

[0061] The utility model also proposes a wireless charging device, wireless charging device includes power adapter and as any one of the above wireless charging base. It is worth noting that because the utility model wireless charging device is based on the above wireless charging base, therefore, the utility model wireless charging device's embodiment includes all the technical solutions of all the above wireless charging base embodiments, and the technical effects reached are also exactly the same, and here no longer repeat.

[0062] The above is only the preferred embodiment of the utility model, and does not limit the patent range of the utility model, and all equivalent structural transformations made by the utility model specification and the attached drawings under the inventive concept of the utility model, or direct / indirect application in other related technical fields are included in the patent protection range of the utility model.

Claims

1. A wireless charging dock, characterized in that, The wireless charging dock includes: A fixed base having a first surface and a second surface that are perpendicular to each other; A circuit board, on which a wireless charging circuit is provided, is disposed on the first surface; A coil, which is electrically connected to a wireless charging circuit on the circuit board, is disposed on the second surface; The wireless charging circuit emits electrical energy through the coil.

2. The wireless charging dock as described in claim 1, characterized in that, A slot is provided on the first surface of the fixed base, and the opening direction of the slot is perpendicular to the first surface. The circuit board is disposed in the slot.

3. The wireless charging dock as described in claim 2, characterized in that, An annular groove is provided on the second surface of the fixed base. The height of the annular groove corresponds to the thickness of the coil, and the coil is disposed in the annular groove.

4. The wireless charging dock as described in claim 3, characterized in that, The wireless charging base also includes a magnetic core, with the coil surrounding the outside of the magnetic core, and the magnetic core disposed on the first surface.

5. The wireless charging dock as described in claim 4, characterized in that, A cylindrical groove is provided on the first surface of the fixed base. The cylindrical groove is located at the center of the annular groove. The diameter of the cylindrical groove is greater than or equal to the diameter of the magnetic core, and the depth of the cylindrical groove is less than the length of the magnetic core.

6. The wireless charging dock as described in claim 1, characterized in that, The distance between the edge of the coil and the circuit board is greater than or equal to 1.5 mm.

7. The wireless charging dock as described in claim 1, characterized in that, The wireless charging circuit includes a voltage conversion circuit and a power supply terminal. The first terminal of the voltage conversion circuit is electrically connected to the power supply terminal, and the second terminal of the voltage conversion circuit is electrically connected to the coil. The voltage conversion circuit is used to convert the input first voltage into a second voltage and output it.

8. The wireless charging dock as described in claim 7, characterized in that, The wireless charging circuit also includes: Main control circuit; A temperature detection circuit, the output of which is electrically connected to the main control circuit, is used to output a temperature detection signal. A switching circuit, wherein the input terminal of the switching circuit is electrically connected to the power supply terminal, the output terminal of the switching circuit is electrically connected to the input terminal of the voltage conversion circuit, and the controlled terminal of the switching circuit is electrically connected to the main control circuit; The main control circuit is used to control the switching circuit to turn on or off the path between the power supply terminal and the voltage conversion circuit according to the temperature detection signal.

9. A wireless charging device, characterized in that, The wireless charging device includes a power adapter and a wireless charging base as described in any one of claims 1 to 6.

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