CN108306428A - Charging equipment method for detecting position based on wireless charging - Google Patents

Abstract

The invention discloses a method for detecting the position of charging equipment based on wireless charging. S3: Obtain the induction current of the induction coil; Step S4: Compare the obtained induction current value with the preset induction current value, and judge whether the induction current of some induction coils changes significantly; Step S5: The induction coil whose induction current changes significantly The formed area is used as the location area of the charging device, and the second excitation signal is output to make the charging and transmitting units in the location area work, and at the same time, the charging and transmitting units outside the location area are turned off to make the charging mechanism enter the charging state. The present invention has the advantages that it is not necessary to intermittently turn on the charging mechanism to detect whether the charging device is connected, thereby improving the service life of the wireless charger.

Description

Location detection method of charging equipment based on wireless charging

technical field

The invention belongs to the technical field of charging, and in particular relates to a method for detecting the position of a charging device based on wireless charging.

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.

In the prior art, the effective charging area of the charging mechanism is small, and the user needs to place the charging device in the corresponding area to charge. In order to expand the effective charging area, multiple coils are usually used to form a charging and transmitting matrix; however, the existing technology still has the following defects:

1. The actual effective charging area of the charging equipment remains unchanged, resulting in an increase in ineffective energy consumption and virtually reducing the charging efficiency.

2. At least the coil at the charging end needs to be turned on intermittently to realize the detection of the charging device, which increases the working pressure of the driving circuit and affects the life of the wireless charger.

Contents of the invention

The purpose of the present invention is to solve the above problems and provide a charging device position detection method based on wireless charging, which can realize the position detection of the charging device without intermittently opening the charging mechanism, and at the same time increase the charging efficiency while expanding the charging area.

In order to achieve the above object, the present invention adopts the following technical solutions: a method for detecting the position of a charging device based on wireless charging includes the following steps:

Step S1: The charging mechanism is not working, waiting for the first induction signal to come, if not, continue to wait; if yes, execute step S2; wherein, the first induction signal is generated by the change of the object in the induction charging area;

Step S2: Outputting a first excitation signal to activate the charging mechanism, wherein multiple charging and transmitting units in the charging mechanism simultaneously generate electromagnetic signals;

Step S3: Obtain the induction current of the induction coil, wherein each charging and transmitting unit is provided with an induction coil;

Step S4: Comparing the obtained induced current value with the preset induced current value, it is judged whether the induced current of some induction coils changes significantly, if not, turn off the charging mechanism, and re-execute step S1; if yes, execute step S5; wherein, The preset induced current value is the induced current value output by the induction coil when the charging mechanism is started with the first excitation signal in the no-load state;

Step S5: Use the area formed by the induction coil where the induced current changes significantly as the location area of the charging device, output the second excitation signal to make the charging and transmitting units in the location area work, and turn off the charging and transmitting units outside the location area to make the charging mechanism enter the charging state .

In the above method, a two-step method is used to determine the location area of the charging device, first judge the change of the object in the charging area, and then judge whether it is the charging device access and its specific location area, and then start the charging mechanism; thus, there is no need to intermittently open the charging mechanism to detect Whether the charging equipment is connected, and at the same time increase the charging efficiency while expanding the charging area.

In the above method, the first excitation signal and the second excitation signal may be the same or different. Preferably, the first excitation signal is a low-power signal used for charging device detection, and the second excitation signal is a high-power signal used for wireless charging by the charging device.

In the above method, the following steps are also included:

In the charging state, when the first induction signal is detected, the charging mechanism is turned off first, and then step S1 is executed again.

In the above method, the first induction signal is generated by the induction module, and its generation mechanism is as follows:

The change of the object in the charging area leads to the change of the weight or the pressure of the charging mechanism, and the sensing module senses the change and generates the first sensing signal.

In the above position detection method, the sensing module adopts a load cell or a pressure sensor.

In the above position detection method, the sensing module is arranged under the charging mechanism.

In the above position detection method, the current detection module is integrated in the circuit board.

In the above position detection method, the charging and 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. formed and surrounds the protruding part; the induction coil is wound by at least one wire and surrounds the protruding part.

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.

In addition, due to the raised design, the induced current of the induction coil is increased, which facilitates current detection, and can also reduce the size of the induction coil.

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 position detection method, 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 position detection method, 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 position detection method, 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 position detection method, the diameters of the protrusions are equal or unequal.

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

In the above position detection method, the transverse section of the protrusion is square.

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

In the above position detection method, 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 position detection method, 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 position detection method, 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 position detection method, when a plurality of charging units are provided, 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.

In the above position detection method, when a plurality of charging and transmitting units are arranged, 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.

In the above position detection method, 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 prior art, the present invention has the advantages of:

1. There is no need to turn on the charging mechanism intermittently to detect whether the charging device is connected, which improves the life of the wireless charger.

2. Make the charging mechanism increase the charging efficiency while expanding the charging area.

3. The designed protrusion increases the induction current of the induction coil, which can easily realize current detection, and can also reduce the size and number of turns of the induction coil. It is more reasonable and meets the current miniaturization design requirements.

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 diagram of a coil structure according to another embodiment of 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 diagram of a coil structure according to another embodiment of 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 device provided by the present invention.

Fig. 8 is a block flow diagram of the position detection method 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.

In the prior art, the wireless charging system generates an excitation signal through the drive circuit to cause the coil at the transmitting end to generate an electromagnetic signal to realize wireless charging of the charging device; and in order to realize the detection of the charging device, at present, charging is generally realized by changing the parameters caused by the connection of the charging device. Equipment detection, therefore, the charging mechanism needs to work at least in a low-power state or intermittently open (for example, once every second), and realize the detection of the charging equipment by detecting the difference in coil parameters between the no-load state and the loaded state. This method increases the working pressure of the driving circuit and affects the life of the wireless charger. At the same time, the long-term opening of the coil (at least intermittently) causes waste of energy to a certain extent.

A wireless charging system generally includes a circuit board and a charging mechanism electrically connected thereto. The charging mechanism includes at least one charging and transmitting unit, and the circuit board is used to control the charging and transmitting unit.

The wireless charging system is in the form of a rigid plate structure or a soft sheet-like pad structure.

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

The idea of the present invention is to form a charging and transmitting matrix based on multiple charging and transmitting units to expand the charging area, and to turn on the corresponding charging and transmitting units according to the location of the charging device, but there is no similar application in the prior art.

Referring to Fig. 8, it shows a flow chart of the position detection method of the present invention, including the following steps:

Step S1: The charging mechanism is not working, waiting for the first induction signal to come, if not, continue to wait; if yes, execute step S2; wherein, the first induction signal is generated by the change of the object in the induction charging area;

Step S2: Outputting a first excitation signal to activate the charging mechanism, wherein multiple charging and transmitting units in the charging mechanism simultaneously generate electromagnetic signals;

Step S3: Obtain the induction current of the induction coil, wherein each charging and transmitting unit is provided with an induction coil;

Step S4: Comparing the obtained induced current value with the preset induced current value, it is judged whether the induced current of some induction coils changes significantly, if not, turn off the charging mechanism, and re-execute step S1; if yes, execute step S5; wherein, The preset induced current value is the induced current value output by the induction coil when the charging mechanism is started with the first excitation signal in the no-load state;

Step S5: Use the area formed by the induction coil where the induced current changes significantly as the location area of the charging device, output the second excitation signal to make the charging and transmitting units in the location area work, and turn off the charging and transmitting units outside the location area to make the charging mechanism enter the charging state .

In the above technical solution, a two-step method is used to determine the location area of the charging device, first judge the change of the object in the charging area, and then judge whether it is the charging device access and its specific location area, and then start the charging mechanism; thus there is no need to intermittently open the charging mechanism Detect whether the charging device is connected. At the same time, the charging efficiency is improved while expanding the charging area.

Preferably, the first excitation signal and the second excitation signal may be the same or different. More preferably, the first excitation signal is a low-power signal used for charging device detection, and the second excitation signal is a high-power signal used for wireless charging by the charging device.

Preferably, the following steps are also included:

In the charging state, when the first induction signal is detected, the charging mechanism is turned off first, and then step S1 is executed again. In this way, the charging mechanism can be turned off in time when the charging device is removed, or when a new charging device is connected, the charging area can be re-determined, and multiple charging devices can be charged at the same time.

Preferably, the first sensing signal is generated by the sensing module, and its generation mechanism is as follows:

The change of the object in the charging area leads to the change of the weight or the pressure of the charging mechanism, and the sensing module senses the change and generates the first sensing signal. Therefore, as long as the state of the charging mechanism changes, the first sensing signal will be triggered.

Referring to Fig. 7, the position detection device of the present invention includes an induction module, a current detection module and at least one induction coil, wherein the induction module is used to detect the state change of the charging mechanism and generate a first induction signal and send it to the circuit board; the circuit board according to The first induction signal outputs an excitation signal to cause the charging mechanism to generate an electromagnetic signal; the charging mechanism includes at least one charging and transmitting unit; the induction coil is arranged in the charging and transmitting unit for inducting the electromagnetic signal generated by the charging and transmitting unit and generating an induced current; The current detection module is connected with the induction coil and the circuit board, and is used to detect the induced current and send it to the circuit board;

The circuit board finally determines whether the charging device is connected to the charging area according to the change of the induced current generated by the induction coil, and controls the coil of the charging transmitting unit to continue to be turned on or off.

As a preferred technical solution, a plurality of charging and transmitting units form a charging and transmitting matrix and form a continuous charging area, each charging and transmitting unit is provided with an induction coil, and the circuit board finally determines the location area of the charging device according to the induced current changes generated by each induction coil, According to the location information of the charging device, the coils in the location area are controlled to work while the coils outside the location area are not in operation.

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. At the same time, there is no need to turn on the charging mechanism intermittently to detect whether the charging device is connected, which improves the life of the wireless charger.

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 Figure 1-2, the charging and transmitting unit includes a magnetic sheet 2 and a coil 3 arranged on the magnetic sheet 2, and at least one protrusion 4 is provided on one side of the magnetic sheet 1, and the protrusion 4 and the magnetic plate 2 form a Vertically distributed, this structure improves the structural strength, and at the same time, the designed protrusions 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 an optimized solution, 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 multiple charging and transmitting units are set in the wireless charging system, a continuous charging area is formed. Thus, the charging area is enlarged, and multiple charging devices can be charged at the same time.

As shown in FIG. 4 , when multiple 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 .

As shown in Figure 3, the distribution structure of the coils in another embodiment is basically the same in principle, and will not be repeated here, but the difference lies in:

When the wireless charging system is equipped with multiple charging and transmitting units, the charging and transmitting units are closely arranged and the magnetic field generated by each charging unit is in 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.

As shown in Figure 5, the distribution structure of the coils in another embodiment is basically the same in principle, and will not be repeated 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. the charging equipment method for detecting position based on wireless charging, which is characterized in that include the following steps：

Step S1：Charging mechanism off working state, waits for whether the first inductive signal arrives, if it is not, continuing waiting for；If so, holding Row step S2；Wherein, the first inductive signal generates for object variation in induction charging region；

Step S2：It exports the first pumping signal and starts charging mechanism, wherein multiple charging transmitter units produce simultaneously in charging mechanism Raw electromagnetic signal；

Step S3：Obtain the induced current of induction coil, wherein be respectively provided with an induction coil in each charging transmitter unit；

Step S4：By the induced electricity flow valuve of acquisition compared with predetermined inductive current value, the sense of part induction coil is judged whether there is Induced current significant change, if it is not, charge closing mechanism, re-executes step S1；If so, executing step S5；Wherein, predetermined inductive Current value is the induced electricity flow valuve of induction coil output when starting charging mechanism in the unloaded state with the first pumping signal；

Step S5：The region that the induction coil of induced current significant change is formed is as the band of position of charging equipment, output The charging transmitter unit that second pumping signal makes the work of the charging transmitter unit in the band of position simultaneously close off outside the band of position makes Charging mechanism enters charged state.

2. method for detecting position according to claim 1, which is characterized in that further comprising the steps of：

In the charge state, when detecting the first inductive signal, first charge closing mechanism, then re-execute step S1.

3. method for detecting position according to claim 1 or 2, which is characterized in that the first inductive signal passes through induction module It generates, generation mechanism is：

Object variation causes the weight change or pressure change of charging mechanism, induction module to incude the variation simultaneously in charged area Generate the first inductive signal.

4. method for detecting position according to claim 3, which is characterized in that the induction module using weighing sensor or Person's pressure sensor.

5. method for detecting position according to claim 1 or 2, which is characterized in that obtained and incuded by current detection module The induced current of coil.

6. method for detecting position according to claim 1 or 2, which is characterized in that the charging transmitter unit includes magnetic sheet (2) and coil (3) on the magnetic sheet (2) is set, there are at least one raised (4) in the one side of the magnetic sheet (1), it is described Coil (3) is formed by an at least conducting wire around boss coiling；The induction coil by an at least conducting wire around Boss coiling forms.

7. method for detecting position according to claim 6, which is characterized in that be closely arranged between charging transmitter unit and every The magnetic direction that a charhing unit generates is identical and then forms one direction emission matrix.

8. method for detecting position according to claim 7, which is characterized in that described coil (3) winding escalator is circlewise square Shape structure；Described protrusion (4) lateral cross section is square.

9. method for detecting position according to claim 6, which is characterized in that in being spaced apart and part between charhing unit The magnetic direction generated between charhing unit forms closed magnetic circuit in turn on the contrary.

10. method for detecting position according to claim 6, which is characterized in that the magnetic sheet that difference charging transmitter unit uses (2) it is integrally formed.