Bicycle wireless charging device

Abstract

The present invention relates to a wireless charging device for a bicycle, which includes a central axis connecting tube, a crank, and a charging mechanism. The charging mechanism includes a non-metallic cylinder fixedly connected to the central axis of the bicycle and inserted into the central axis connecting tube, a transmitting end coil wound on the non-metallic cylinder, a receiving end coil wound on the side wall of the central axis connecting tube and coupled with the transmitting end coil, a charging module fixed on the non-metallic cylinder and connected to the transmitting end coil, and a rectifier module fixed in the central axis connecting tube and connected to the receiving end coil. The wireless charging device for a bicycle arranges the receiving end coil in the hollow central axis connecting tube, and cooperates with the structural design of inserting a cylindrical transmitting end device, providing more space to increase the number of turns of the induction coil and the coupling degree of the coil, thereby improving the charging efficiency. At the same time, the entire charging mechanism is arranged inside the central axis and the central axis connecting tube, and the extended line is sealed with glue, thereby achieving comprehensive protection of the charging mechanism.

Description

Technical Field

[0001] The invention relates to the technical field of bicycle accessories and wireless charging, and in particular to a bicycle wireless charging device. Background Art

[0002] At present, more and more intelligent devices are being applied to bicycles, including power meters on bicycles used by professional athletes. The existing power supply methods of bicycle power meters mainly include non-rechargeable button batteries and rechargeable lithium batteries. Both batteries have problems in updating electric energy that cannot be ignored. The button batteries need to be replaced, which increases the complexity of operation and the uncontrollability of waterproofing. The existing wireless charging method adopts the principle of electromagnetic induction. This method requires the distance between the coils of the sending and receiving devices to be as small as possible to ensure charging efficiency. Therefore, the charging plate and the charged device still need to be in contact. The power meter on the bicycle is generally installed on the side of the crank and the pressure plate facing the frame. The wireless charging coil integrated in the sensor cannot be wound with enough turns due to space limitations, resulting in low charging efficiency. In addition, the existing rechargeable lithium batteries are still charged by exposing charging contacts, which cannot truly achieve full waterproofing. The exposed contacts are also easily corroded by the external environment and affect the charging effect. Summary of the invention

[0003] The technical problem to be solved by the present invention is: to overcome the defects of low charging efficiency and incomplete protection of the existing bicycle wireless charging structure, and to provide a bicycle wireless charging device. The wireless charging device combines the unique structure of the bicycle, arranges the receiving end coil in the hollow axis connecting tube, and cooperates with the structural design of inserting a cylindrical transmitting end device. Compared with the sensor built-in coil method, it provides more space to increase the number of turns of the induction coil and the coupling degree of the coil, thereby improving the charging efficiency. At the same time, the entire charging mechanism is arranged inside the central axis and the central axis connecting tube, and the extended line is sealed with glue, thereby achieving comprehensive protection of the charging mechanism.

[0004] The wireless charging device for a bicycle comprises a pair of hollow central axis connecting tubes rotatably connected to the two ends of the central axis of the bicycle, a crank mounted at the outer end of the central axis connecting tube, a charging mechanism fixed in the central axis of the bicycle and inserted in the central through connecting tube, the input end of the charging mechanism is connected to the power supply module, and the output end of the charging mechanism extends through the central axis connecting tube to the power meter inside the crank, wherein the charging mechanism comprises a non-metallic cylinder fixedly connected to the central axis of the bicycle and inserted into the central axis connecting tube, a transmitting end coil wound on the non-metallic cylinder, a receiving end coil wound on the side wall of the central axis connecting tube and coupled with the transmitting end coil, a charging module fixed on the non-metallic cylinder and connected to the transmitting end coil, and a rectifier module fixed in the central axis connecting tube and connected to the receiving end coil; the output end of the receiving end coil extends through the hollow connecting tube to the crank, and is used to supply power to the power meter on the crank; the input end of the charging module is used to connect to the power supply module; and the output end of the rectifier module is used to connect to the power meter. The hollow central axis connecting tube carries the receiving end coil, and the cylindrical non-metallic cylinder is inserted to carry the transmitting end coil. Compared with the built-in coil of the sensor, it provides more space for increasing the number of turns of the winding induction coil, thereby strengthening the coupling between the charging transmitting coil and the receiving coil, thereby improving the charging efficiency.

[0005] Furthermore, a magnetic conductive material layer is attached to the inner wall of the central axis connecting tube, and the transmitting end coil is wound on the inner surface of the magnetic conductive material layer. Furthermore, the magnetic conductive material layer is a ferrite cylinder. The magnetic circuit between the transmitting end coil and the receiving end coil is strengthened, and the coupling efficiency is further improved.

[0006] Furthermore, the non-inserted portion of the non-metallic cylinder is glued and fixed to the inner wall of the bicycle center shaft, and the inserted portion of the non-metallic cylinder is tightly matched with the center shaft connecting pipe.

[0007] Specifically, a wire groove is provided on the crank on the side close to the chainring, and a wire hole is provided on the central axis connecting tube on the side close to the chainring. The receiving end coil on the side close to the chainring is extended through the wire hole through the rectifier module to the power meter installation position along the wire groove. Since the crank at this end is fixedly connected to the central axis connecting tube, the crank charging line can be directly extended to the device on the crank. Specifically, a wire groove is provided on the crank away from the chainring, and a conductor column is provided inside the wire groove. An elastic contact column is provided on the central axis connecting tube on the side away from the chainring at one end away from the chainring, and the receiving end coil on the side away from the chainring is connected to the elastic contact column through the rectifier module. One end of the conductor column is elastically crimped with the elastic contact column, and the other end extends to the power meter installation position. Since the crank at this end is separated from the central axis connecting tube after disassembly, the crank charging line needs to be treated as a disassembly and assembly, separation and connection type structure.

[0008] Furthermore, the extension wire / conductor column is filled with glue and fixed in the wire groove, and then covered with paint, thereby achieving a comprehensive closure of the charging mechanism.

[0009] Specifically, the charging module is integrated with a control circuit, a bridge drive circuit, and a resonant circuit. The power supply module is connected to the transmitting coil via the bridge drive circuit and the resonant circuit, and the control circuit is connected to the bridge drive circuit and the resonant circuit respectively; the rectifier module is integrated with a resonant circuit, a rectifier circuit, and a control circuit. The receiving coil supplies power to the power meter via the resonant circuit and the rectifier circuit. The control circuit can use an existing MM32 processing chip to control the bridge drive circuit to adjust the AC square wave and receive the resonant signal. This part can be replaced by an existing charging transmitter and receiver integrated module based on the Qi protocol.

[0010] Specifically, the transmitting coil (32) has a diameter of 2 cm, a length of 2 cm, and a number of turns of 20; the receiving coil (33) has the same length and number of turns as the transmitting coil (32); and the gap between the transmitting coil (32) and the receiving coil (33) is 3 mm. With the help of the hollow shaft structure unique to bicycles, the coupling between the transmitting coil and the receiving coil is similar to the coupling model of two coaxial solenoids, and the mutual inductance value is , coupling coefficient k= . Substitute into the calculation of mutual inductance L 21 ≈3.2μH, coupling coefficient k≈93%, which is close to the tight coupling of a transformer. The conventional planar coupling model is affected by the number of coil turns and the relative position of the coil. Compared with the commonly used flat plate coupling model, this coupling model can obtain more turns and better coupling structure, thereby greatly increasing the mutual inductance and coupling coefficient and thus improving the wireless charging efficiency.

[0011] The present invention discloses a wireless charging device for bicycles, which overcomes the defects of low charging efficiency and incomplete protection of existing wireless charging structures for bicycles. The device combines the unique structure of the bicycle, arranges a receiving end coil in a hollow middle shaft connecting tube, and cooperates with the structural design of inserting a cylindrical transmitting end device. Compared with the method of built-in coils in sensors, more space is provided to increase the number of winding turns of the induction coil and the coupling degree of the coil, thereby improving the charging efficiency. At the same time, the entire charging mechanism is arranged inside the middle shaft and the middle shaft connecting tube, and the extended line is sealed with glue, thereby achieving comprehensive protection of the charging mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The following is a further description of a bicycle wireless charging device of the present invention in conjunction with the accompanying drawings:

[0013] Figure 1 It is a schematic diagram of the planar structure of the wireless charging device for bicycle;

[0014] Figure 2 yes Figure 1 A longitudinal half-section view of a crank and toothed disc (crank and toothed disc are not shown);

[0015] Figure 3 yes Figure 1 AA section view of (the tooth plate is not shown);

[0016] Figure 4 yes Figure 1 BB section view;

[0017] Figure 5 This is a block diagram of the logical structure connection of the bicycle wireless charging device.

[0018] In the figure:

[0019] 1-central axis connecting pipe; 11-magnetic conductive material layer, 12-wire hole, 13-elastic contact column;

[0020] 2-crank; 21-conductor slot, 22-extension wire, 23-conductor column;

[0021] 3-charging mechanism; 31-non-metallic cylinder, 32-transmitting end coil, 33-receiving end coil, 34-charging module, 35-rectifier module. DETAILED DESCRIPTION

[0022] In the present invention, 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 directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] In the description of the present invention, it should be understood that the terms "left", "right", "front", "back", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0024] The technical solution of the present invention is further described below with specific embodiments, but the protection scope of the present invention is not limited to the following embodiments.

[0025] Implementation method 1: Figure 1 , 2As shown, the bicycle wireless charging device includes a pair of hollow central axis connecting tubes 1 rotatably connected to the two ends of the central axis of the bicycle, a crank 2 installed at the outer end of the central axis connecting tube 1, and a charging mechanism 3 fixed in the central axis of the bicycle and inserted in the central connecting tube 1, wherein the input end of the charging mechanism 3 is connected to the power supply module, and the output end of the charging mechanism 3 extends through the central axis connecting tube 1 to the power meter inside the crank 2, wherein the charging mechanism 3 includes a non-metallic cylinder 31 fixedly connected to the central axis of the bicycle and inserted into the central axis connecting tube 1, a transmitting end coil 32 wound on the non-metallic cylinder 31, a receiving end coil 33 wound on the side wall of the central axis connecting tube 1 and coupled with the transmitting end coil 32, and an output end of a charging module 34 fixed on the non-metallic cylinder 31 and connected to the transmitting end coil 32; the output end of the receiving end coil 33 extends through the hollow connecting tube 1 to the crank 2, and is used to supply power to the power meter on the crank 2; the input end of the charging module 34 is used to connect to the power supply module. The hollow central axis connecting tube carries the receiving end coil, and the cylindrical non-metallic cylinder is inserted to carry the transmitting end coil. Compared with the built-in coil of the sensor, it provides more space for increasing the number of turns of the winding induction coil, thereby strengthening the coupling between the charging transmitting coil and the receiving coil, thereby improving the charging efficiency.

[0026] Implementation 2: The inner wall of the central axis connecting tube 1 of the bicycle wireless charging device is attached with a magnetic material layer 11, and the transmitting end coil 32 is wound on the inner surface of the magnetic material layer 11. Furthermore, the magnetic material layer 11 is a ferrite cylinder. The magnetic circuit between the transmitting end coil and the receiving end coil is strengthened, and the coupling efficiency is further improved. The uninserted part of the non-metallic cylinder 31 is glued and fixed to the inner wall of the central axis of the bicycle, and the inserted part of the non-metallic cylinder 31 is tightly matched with the central axis connecting tube 1. The remaining structures and components are as described in Implementation 1 and will not be repeated.

[0027] Implementation method 3: Figure 3 , 4As shown, the crank 2 on the side close to the tooth plate of the bicycle wireless charging device is provided with a wire groove 21, and the central axis connecting tube 1 on the side close to the tooth plate is provided with a wire hole 12. The receiving end coil 33 on the side close to the tooth plate is extended through the rectifier module 35 through the extension wire 22 through the wire hole 12 along the wire groove 21 to the power meter installation position. Since the end crank is fixedly connected to the central axis connecting tube, the crank charging line can be directly extended to the device on the crank. The crank 2 on the side away from the tooth plate is provided with a wire groove 21, and a conductor column 23 is provided inside the wire groove 21. The central axis connecting tube 1 on the side away from the tooth plate is provided with an elastic contact column 13 at one end away from the tooth plate. The receiving end coil 33 on the side away from the tooth plate is connected to the elastic contact column 13 through the rectifier module 35. One end of the conductor column 23 is elastically crimped with the elastic contact column 13, and the other end extends to the power meter installation position. Since the end crank is separated from the central axis connecting tube after disassembly, the crank charging line needs to be treated with a disassembly and assembly separation and connection type structure. The remaining structures and components are as described in Implementation 1 and will not be described again.

[0028] Embodiment 4: The extension wire 22 / conductor column 23 in the wire groove 21 of the bicycle wireless charging device is filled with glue and fixed, and then covered with paint. Thus, the charging mechanism is fully enclosed. The remaining structures and components are as described in Embodiment 1 and will not be described again.

[0029] Implementation 5: Figure 5 As shown, the charging module 34 of the wireless charging device for bicycles is integrated with a control circuit, a bridge driving circuit, and a resonant circuit. The power supply module is connected to the transmitting coil 32 via the bridge driving circuit and the resonant circuit, and the control circuit is connected to the bridge driving circuit and the resonant circuit respectively; the rectifier module is integrated with a resonant circuit, a rectifier circuit, and a control circuit, and the receiving coil 33 supplies power to the power meter via the resonant circuit and the rectifier circuit. The control circuit can use the existing MM32 processing chip to control the bridge driving circuit to adjust the AC square wave and receive the resonant signal. This part can be replaced by the existing charging transmitting and receiving integrated module based on the Qi protocol. The remaining structures and components are as described in Implementation 1 and will not be described again.

[0030] Embodiment 6: The transmitting coil (32) of the bicycle wireless charging device has a diameter of 2 cm, a length of 2 cm, and a number of turns of 20; the length and number of turns of the receiving coil (33) are consistent with those of the transmitting coil (32); the gap between the transmitting coil (32) and the receiving coil (33) is 3 mm. With the help of the hollow shaft structure unique to bicycles, the coupling between the transmitting coil and the receiving coil is similar to the coupling model of two coaxial solenoids, and the mutual inductance value is , coupling coefficient k= . Substitute into the calculation of mutual inductance L 21≈3.2μH, coupling coefficient k≈93%, which is close to the tight coupling of a transformer. The conventional planar coupling model is affected by the number of coil turns and the relative position of the coil. Compared with the commonly used flat plate coupling model, this coupling model can obtain more turns and better coupling structure, thereby greatly increasing the mutual inductance and coupling coefficient and thus improving the wireless charging efficiency.

[0031] During operation: the power supply module supplies power, which is then driven by the charging module and transmitted to the transmitting coil to generate an alternating magnetic field. The receiving coil generates an alternating current through the alternating magnetic field and transmits it to the power meter mainboard. The alternating current of the receiving coil is filtered and rectified by the rectifier module and then supplies power to the power meter. The power meter can be replaced by other vehicle-mounted load devices.

[0032] The wireless charging device for bicycle overcomes the defects of low charging efficiency and incomplete protection of existing wireless charging structures for bicycles. It combines the unique structure of bicycles, arranges the receiving end coil in the hollow middle axis connecting tube, and cooperates with the structural design of inserting the cylindrical transmitting end device. Compared with the method of built-in coil in the sensor, it provides more space to increase the number of turns of the induction coil and the coupling degree of the coil, thereby improving the charging efficiency. At the same time, the entire charging mechanism is arranged inside the middle axis and the middle axis connecting tube, and the extended line is sealed with glue, thereby realizing comprehensive protection of the charging mechanism.

[0033] The above description shows the main features, basic principles, and advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments or embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, the above embodiments or embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0034] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A wireless charging device for a bicycle, characterized in that: The invention comprises a pair of hollow middle shaft connecting tubes (1) rotatably connected to the two ends of the middle shaft of a bicycle, a crank (2) mounted on the outer end of the middle shaft connecting tube (1), and a charging mechanism (3) fixed in the middle shaft of the bicycle and inserted into the middle shaft connecting tube (1), wherein the input end of the charging mechanism (3) is connected to a power supply module, and the output end of the charging mechanism (3) extends through the middle shaft connecting tube (1) to a power meter on the inner side of the crank (2), wherein: The charging mechanism (3) comprises a non-metallic cylinder (31) fixedly connected to the central axis of the bicycle and inserted into the central axis connecting tube (1), a transmitting end coil (32) wound on the non-metallic cylinder (31), a receiving end coil (33) wound on the side wall of the central axis connecting tube (1) and coupled to the transmitting end coil (32), a charging module (34) fixed on the non-metallic cylinder (31) and connected to the transmitting end coil (32), and a rectifying module (35) fixed in the central axis connecting tube (1) and connected to the receiving end coil (33); The output end of the receiving end coil (33) extends to the crank (2) through the empty connecting pipe (1) and is used to supply power to the power meter on the crank (2); the input end of the charging module (34) is used to connect to the power supply module; and the output end of the rectifier module (35) is used to connect to the power meter; A magnetic conductive material layer (11) is attached to the inner wall of the central axis connecting tube (1), and the transmitting end coil (32) is wound on the inner surface of the magnetic conductive material layer (11); A wire groove (21) is provided on the crank (2) on the side close to the toothed disc, a wire hole (12) is provided on the central axis connecting tube (1) on the side close to the toothed disc, and a receiving end coil (33) on the side close to the toothed disc is extended through a rectifier module (35) through an extension wire (22) through the wire hole (12) along the wire groove (21) to a power meter installation position; a wire groove (21) is provided on the crank (2) on the side away from the toothed disc, and a conductor column (23) is provided inside the wire groove (21), and an elastic contact column (13) is provided on the central axis connecting tube (1) on the side away from the toothed disc at one end away from the toothed disc, and the receiving end coil (33) on the side away from the toothed disc is connected to the elastic contact column (13) through the rectifier module (35), one end of the conductor column (23) is elastically crimped to the elastic contact column (13), and the other end extends to the power meter installation position.

2. The bicycle wireless charging device according to claim 1, characterized in that: The magnetic conductive material layer (11) is a ferrite cylinder.

3. The bicycle wireless charging device according to claim 2, characterized in that: The non-inserted portion of the non-metallic cylinder (31) is glued and fixed to the inner wall of the bicycle center shaft, and the inserted portion of the non-metallic cylinder (31) is tightly matched with the center shaft connecting pipe (1).

4. The bicycle wireless charging device according to claim 3 is characterized in that: The extension wire (22) / conductor column (23) is filled with glue and fixed in the wire groove (21), and then covered with paint.

5. The bicycle wireless charging device according to claim 4 is characterized in that: The charging module (34) is integrated with a control circuit, a bridge drive circuit, and a resonant circuit; the power supply module is connected to the transmitting end coil (32) via the bridge drive circuit and the resonant circuit; the control circuit is respectively connected to the bridge drive circuit and the resonant circuit; the rectifier module is integrated with a resonant circuit, a rectifier circuit, and a control circuit; the receiving end coil (33) supplies power to the power meter via the resonant circuit and the rectifier circuit.

6. The bicycle wireless charging device according to any one of claims 1 to 5, characterized in that: The transmitting end coil (32) has a diameter of 2 cm, a length of 2 cm, and a number of turns of 20; the receiving end coil (33) has the same length and number of turns as the transmitting end coil (32); and the gap between the transmitting end coil (32) and the receiving end coil (33) is 3 mm.

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