CN108199436A - Wireless charging system - Google Patents

Abstract

The invention belongs to the technical field of charging, and in particular relates to a wireless charging system. It solves technical problems such as unreasonable design of the prior art. The wireless charging system includes a circuit board and a charging mechanism electrically connected to it, the charging mechanism includes at least one charging and transmitting unit, the circuit board is used to control the charging and transmitting unit, and the charging and transmitting unit includes a magnetic sheet and a setting The coil on the magnetic sheet has at least one protrusion on one side of the magnetic sheet, and the coil is formed by winding at least one wire around the protrusion. The invention has the advantages of higher magnetic field strength and low cost.

Description

wireless charging system

technical field

The invention belongs to the technical field of charging, and in particular relates to a wireless charging system.

Background technique

Wireless charging is actually a device that uses the principle of electromagnetic induction for charging. Similar to a transformer, there is a coil at the sending and receiving ends. The coil at the sending end is connected to a wired power supply to generate an electromagnetic signal, and the coil at the receiving end induces the electromagnetic signal at the sending end to generate current. To electrical equipment. As shown in Figure 6, current flowing through the coil will generate a magnetic field, and other non-energized coils will generate current when they are close to the magnetic field. Wireless charging applies this physical phenomenon.

In the prior art, the wireless charging structure includes a circuit board, a magnetic board, and a coil. Usually, a magnetic isolation sheet (soft magnetic material) is arranged on the circuit board, and a coil is arranged on the magnetic isolation sheet. The circuit board controls the coil to generate an electromagnetic field, and the charging device (built-in coil) for charging.

Existing coils are usually planar coils arranged on flat magnetic plates, which have the following defects:

1. The unstable magnetic circuit formed by the coil leads to a longer effective magnetic circuit, which virtually reduces the charging efficiency.

2. The effective charging area is small, and the user needs to place the charging device in the corresponding area to charge.

Contents of the invention

The purpose of the present invention is to solve the above problems and provide a wireless charging system with higher charging efficiency and lower cost.

In order to achieve the above object, the present invention adopts the following technical solutions: the wireless charging system includes a circuit board and a charging mechanism electrically connected to it, the charging mechanism includes at least one charging transmitter unit, and the circuit board is used to control the charging The transmitting unit, the charging transmitting unit includes a magnetic sheet and a coil arranged on the magnetic sheet, at least one protrusion is provided on one side of the magnetic sheet, and the coil is wound by at least one wire and surrounds the protrusion parts.

The designed protrusion can effectively shorten the magnetic circuit, thereby further improving the charging efficiency.

Secondly, the protrusions can further increase the strength of the magnetic field, so that the overall volume can be further reduced, and the design is more reasonable and meets the current miniaturization design requirements.

There is also a raised design, which forms a structural reinforcement to the entire magnetic sheet, avoiding the bending phenomenon.

Furthermore, the designed protrusions form several heat conduction and heat dissipation functions, which can further improve the heat dissipation performance of the entire magnetic sheet.

In the above wireless charging system, the magnetic plate and the protrusion are integrally formed.

One-piece molding, which improves the structural strength and facilitates production, processing and manufacturing.

In the above wireless charging system, the protrusion is fixed on the magnetic plate through the connecting structure.

The connection structure includes methods such as plugging or bonding.

In the above wireless charging system, the heights of the protrusions are equal or unequal.

The setting of the height can be set according to the actual use requirements.

In the above wireless charging system, the protrusions have equal or different diameters.

Different designs of diameters can adapt to different coils, so as to be suitable for various carriers to be charged.

In the above wireless charging system, the transverse section of the protrusion is square.

Of course, it can also be any one of hexagon, circle and rhombus.

In the above wireless charging system, the multiple charging and transmitting units are connected in parallel or in series to form a charging and transmitting matrix. The circuit board can control the work of each charging and transmitting unit at the same time, and can also independently control the work of any charging and transmitting unit.

In the above wireless charging system, the magnetic sheets used by different charging and transmitting units are integrally formed. Thereby, the magnetic flux leakage can be reduced, and the magnetic field strength can be further increased.

In the above wireless charging system, the magnetic sheet and the protrusion are made of soft magnetic material. Soft magnetic materials are easy to obtain and easier to process. Preferably, the soft magnetic material includes but not limited to ferrite material, plastic magnetic material, iron powder material and the like.

In the above wireless charging system, when the wireless charging system is provided with a plurality of charging transmitting units, a continuous charging area is formed. Since multiple charge-emitting units form a continuous charge area, the effective charge area is greatly increased.

In the above wireless charging system, a position detection unit is further included, the position detection unit is used to detect the position area of the charging device and send the position information to the circuit board, and the circuit board controls the charging device within the position area according to the position information. Coils work and coils outside the location area do not work. Since the position detection unit is provided, the corresponding coil can be selected to work and other coils can be turned off without consuming useless energy.

In the wireless charging system described above, when the wireless charging system is provided with a plurality of charging units, the charging units are distributed at intervals and the directions of the magnetic fields generated between some of the charging units are opposite to form a closed magnetic circuit.

This structure can form the spatial distribution of the magnetic field by only using a small number of coils, effectively reducing the number of coils distributed, eliminating the need to arrange coils at each position, and effectively reducing manufacturing costs.

As another solution, in the above-mentioned wireless charging system, when the wireless charging system is provided with multiple charging and transmitting units, the charging and transmitting units are closely arranged and each charging unit generates a magnetic field in the same direction to form a unidirectional transmitting matrix.

In the above wireless charging system, the coil is coiled to form a ring-shaped square structure. The design of the structure can make full use of existing space resources and can provide a larger magnetic field in a limited space.

The square structure can completely solve the gap formed between two adjacent coils of the circular coil, and the spatial distribution is denser and more reasonable.

Compared with the existing technology, the advantages of this wireless charging system are:

1. The designed protrusion can effectively shorten the magnetic circuit, thereby further improving the charging efficiency.

Secondly, the protrusions further increase the strength of the magnetic field, so that the overall volume can be further reduced, and the design is more reasonable and meets the current miniaturization design requirements.

2. The structure is simple and easy to cascade to expand the effective charging area.

Description of drawings

Fig. 1 is a schematic diagram of the structure provided by the present invention.

Fig. 2 is a structural schematic diagram of another viewing angle provided by the present invention.

Fig. 3 is a schematic structural diagram of Embodiment 2 provided by the present invention.

Fig. 4 is a schematic diagram of a state where the direction of the magnetic field is reversed provided by the present invention.

Fig. 5 is a schematic structural diagram of Embodiment 4 provided by the present invention.

Fig. 6 is a schematic structural diagram of the prior art provided by the present invention.

Fig. 7 is a block diagram of a position detection unit provided by the present invention.

In the figure, circuit board 1, magnetic board 2, coil 3, protrusion 4.

Detailed ways

The following are specific embodiments of the invention and in conjunction with the accompanying drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

Embodiment one

As shown in Fig. 1-2, the wireless charging system of the present invention has a rigid plate-like structure or a soft sheet-like pad structure.

Such as wireless charging pad or mouse pad and so on.

The wireless charging system includes a circuit board and a charging mechanism electrically connected thereto. The charging mechanism includes at least one charging and transmitting unit. The circuit board is used to control the charging and transmitting unit. The charging and transmitting unit includes a magnetic sheet 2 and is arranged on The coil 3 on the magnetic sheet 2 has at least one protrusion 4 on one side of the magnetic sheet 1, and the protrusion 4 is vertically distributed with the magnetic plate 2. This structure improves the structural strength, and at the same time, the designed protrusion can Effectively shorten the magnetic circuit, thereby further improving the charging efficiency. Secondly, the protrusions can further increase the strength of the magnetic field, so that the overall volume can be further reduced, and the design is more reasonable and meets the current miniaturization design requirements.

The coil 3 is wound by at least one wire and surrounds the raised portion. The circuit board 1 controls the coil to generate a magnetic field.

The thickness of the coil 3 is smaller than the height of the protrusion.

In this embodiment, the magnetic plate 2 and the protrusion 4 are integrally formed, and the magnetic sheet 2 and the protrusion 4 are made of soft magnetic materials.

As an optimization solution, the heights of the protrusions 4 in this embodiment are equal or unequal.

As an optimization solution, the diameters of the protrusions 4 in this embodiment are equal or unequal.

As an optimization solution, the transverse section of the protrusion 4 in this embodiment is square.

As an optimization solution, the coil 3 of this embodiment is coiled to form a circular square structure.

As an optimization solution, the multiple charging and emitting units of this embodiment are connected in parallel or in series to form a charging and emitting matrix. Due to the formation of a charging and emitting matrix, the effective charging range is greatly increased.

In an optimized solution, the magnetic sheets 2 used by different charging and transmitting units are integrally formed. The one-piece molding not only improves the structural strength and further improves the production efficiency, but also reduces magnetic flux leakage and further increases the magnetic field strength.

When the wireless charging system is provided with a plurality of charging transmitting units, a continuous charging area is formed. Thus, the charging area is enlarged, and multiple charging devices can be charged at the same time.

In the optimized solution, the system also includes a position detection unit, which is used to detect the position area of the charging device and send the position information to the circuit board 1, and the circuit board 1 controls the coils in the position area of the charging device according to the position information 3 works and the coil 3 outside the position area does not work.

In a preferred embodiment, the position detection unit includes an induction film, which is integrally arranged on the charging mechanism, and covers the coils of each charging and transmitting unit to form the same horizontal plane. The sensing film can be a capacitive film or a resistive film, and its principle is similar to the touch sensing film widely used in smart devices in the prior art. When the charging device is placed on the sensing film, the sensing film will produce different induction signal. The circuit board can determine whether the charging device is placed on the induction film and the specific location area by detecting the induction signal, so as to accurately control the operation of the corresponding coil and turn off other coils. By adopting the above-mentioned technical means, the charging area can be enlarged by arranging a plurality of charging and transmitting units, and the purpose of saving energy can also be achieved.

In another preferred embodiment, as shown in Figure 7, the position detection unit further includes an induction module, a current detection module, and an induction coil arranged in each charging and transmitting unit, wherein the induction module is connected to the circuit board, and the induction module The module is used to detect whether the charging device is placed in the charging area. When it is detected that the charging device is placed in the charging area, the first induction signal is generated. The circuit board controls all the charging and transmitting units to start working at the same time according to the first induction signal; the current detection module and the induction The coil is connected to the circuit board. The induction coil is used to generate an induced current in a changing magnetic field. The current detection module is used to detect the induced current generated by the induction coil and send it to the circuit board. The circuit board is determined according to the change of the induced current generated by each induction coil. The specific location area of the charging device, and thus control the corresponding coil to continue to work, while turning off other coils. By adopting the above-mentioned technical means, the charging area can be enlarged by arranging a plurality of charging and transmitting units, and the purpose of saving energy can also be achieved.

The principle of the above-mentioned technical means is as follows. A two-step method is used to determine the location area of the charging device. First, it is judged whether the charging device is placed on the charging mechanism. When the coil is turned on and working, under the excitation signal of the same intensity and frequency, the magnetic field generated by it is constant. Therefore, the induced current generated by the induction coil in this magnetic field is also constant. The no-load state of the charging mechanism is stored in the circuit board in advance. the induced current value. When a charging device is placed on it, since the charging device has a built-in charging coil, the existence of the charging coil will cause the magnetic field in the corresponding area to change, and the induced current generated by the corresponding induction coil will also change accordingly. The location area of the device, that is, the area where the induction coil that induces the current change is located is the specific location area of the charging device. Conversely, if there is no change in the induced current generated by each coil, it means that the device placed on the charging device does not support the wireless charging function, and the coil is turned off.

Furthermore, the sensing module adopts a load cell or a pressure sensor, which can be closely arranged under the charging mechanism. When the charging device is placed above the charging mechanism, its weight value or pressure value changes to generate the first sensing signal.

Further, the current detection module can be integrally arranged in the circuit board, and a corresponding current detection circuit is provided for each induction coil, or multiple induction coils multiplex a current detection circuit through a selection circuit.

Further, the induction coil is formed by winding at least one wire around the raised part. Due to the raised design, the induced current is increased, which facilitates current detection, and can also reduce the size of the induction coil.

As shown in FIG. 4 , when a plurality of charging units are provided in the wireless charging system, the charging units are distributed at intervals, and the directions of the magnetic fields generated between some of the charging units are opposite to form a closed magnetic circuit.

The design of this structure can form the spatial distribution of the magnetic field with only a few coils, that is, magnetic fields of different polarities are generated between multiple coils, so that a closed magnetic circuit can be formed between the coils with opposite polarities. The distributed number of coils is effectively reduced, and there is no need to separately arrange coils at each position, thereby effectively reducing manufacturing costs.

The side of the coil 3 away from the magnetic plate 2 is located in the same horizontal plane.

The thickness of the coil 3 is equal to the height of the protrusion 4 .

Embodiment two

As shown in Figure 3, the structure and principle of the present embodiment are basically the same as those of the first embodiment, so we won’t repeat them here, but the difference lies in:

When the wireless charging system is provided with multiple charging and transmitting units, the charging and transmitting units are closely arranged and the magnetic field generated by each charging unit has the same direction to form a unidirectional transmitting matrix. More optionally, the coil is coiled to form a ring-shaped square structure. The design of the structure can make full use of existing space resources and can provide a larger magnetic field in a limited space.

The square structure can completely solve the gap formed between two adjacent coils of the circular coil, and the spatial distribution is denser and more reasonable.

Embodiment three

The structure and principle of this embodiment are basically the same as those of Embodiment 1, so they will not be repeated here. The difference lies in:

The protrusion 4 is fixed on the magnetic plate 2 through the connecting structure.

Embodiment Four

As shown in Figure 5, the structure and principle of the present embodiment are basically the same as those of the first embodiment, so we won’t repeat them here, but the difference lies in:

The coils 3 are circular and distributed in an array.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which the present invention belongs can make various modifications or supplements to the described specific embodiments or adopt similar methods to replace them, but they will not deviate from the spirit of the present invention or go beyond the definition of the appended claims range.

Claims (10)

1. A wireless charging system, comprising a circuit board and a charging mechanism electrically connected thereto, the charging mechanism includes at least one charging and transmitting unit, the circuit board is used to control the charging and transmitting unit, and the charging and transmitting unit includes a magnetic sheet (2) and the coil (3) arranged on the magnetic sheet (2), characterized in that, there is at least one protrusion (4) on one side of the magnetic sheet (1), and the coil (3) At least one wire is wound around the raised portion. 2. The wireless charging system according to claim 1, characterized in that, the magnetic sheet (2) and the protrusion (4) are integrally formed or the protrusion (4) is fixed on the magnetic sheet ( 2) on. 3. The wireless charging system according to claim 1 or 2, wherein a plurality of charging and transmitting units are connected in parallel or in series to form a charging and transmitting matrix. 4. The wireless charging system according to claim 1 or 2, characterized in that the magnetic sheets (2) used by different charging and transmitting units are integrally formed. 5. The wireless charging system according to claim 1 or 2, characterized in that, the magnetic sheet (2) and protrusion (4) are made of soft magnetic material. 6. The wireless charging system according to claim 1 or 2, wherein a continuous charging area is formed when the wireless charging system is provided with a plurality of charging transmitting units. 7. The wireless charging system according to claim 6, further comprising a position detection unit, the position detection unit is used to detect the position area of the charging device and send the position information to the circuit board (1), the The circuit board (1) controls the coils (3) within the location area of the charging device to work and the coils (3) outside the location area to not work according to the location information. 8. The wireless charging system according to claim 6, wherein when the wireless charging system is provided with a plurality of charging units, the charging units are distributed at intervals and the directions of the magnetic fields generated between some charging units are opposite to form a closed magnetic field. road. 9. The wireless charging system according to claim 6, characterized in that, when the wireless charging system is provided with multiple charging and transmitting units, the charging and transmitting units are closely arranged and the magnetic field generated by each charging unit has the same direction to form a single direction launch matrix. 10. The wireless charging system according to claim 9, characterized in that, the coil (3) is coiled to form a ring-shaped square structure; the transverse section of the protrusion (4) is square.