CN107346906B - Wireless system, active pen and mode switching method - Google Patents

Abstract

The present invention provides an active pen, comprising a flexible circuit board, a rectifier circuit, a near field communication circuit and a mode switching switch; the flexible circuit board comprises a plurality of induction coils; at least one of the induction coils induces an induced current with an external coil, and one of the induction coils comprises an external coil and an internal coil; the rectifier circuit receives the induced current and rectifies the induced current, and provides a rectified current to a load; the mode switching switch determines an operation mode of the active pen according to an input signal; when the active pen is in a near field communication mode, the internal coil is disconnected from the external coil through the mode switching switch and connected to the near field communication circuit, and when the active pen is in a charging mode, the internal coil is connected to the external coil through the mode switching switch.

Description

Wireless system, active pen, and method for switching modes

technical field

The present invention relates to an active pen, in particular to an active pen with switchable operation modes.

Background technique

Today's portable electronic devices, such as tablet computers or smart phones, are widely used in various fields. The user can use the active pen to operate these portable electronic devices. Generally speaking, the active pen is divided into active and passive. The passive active pen is easy to obtain, but the accuracy is not enough, and the active active pen can meet the needs of the user's precise input, but must have a power source, such as a battery, to operate.

The battery of the active active pen can be designed to be charged by wireless charging, and the user can place the active active pen on a wireless charging pad to charge the active active pen. When the active active pen is placed on the wireless charging pad, an induction coil of the active active pen must be aligned with the charging coil of the wireless charging pad in order to achieve the best charging efficiency. However, the pen body of the active active pen is generally designed as a cylinder or a corner cylinder, which makes the active active pen roll easily and cannot be accurately aligned when placed on the wireless charging board, which affects the charging efficiency of the active active pen. Therefore, how to It is a topic worthy of research to make the active active pen stably achieve the best charging efficiency.

SUMMARY OF THE INVENTION

In view of this, the present invention proposes an active pen to solve the above problems.

The invention provides an active pen, which includes a casing, a flexible circuit board, a rectifier circuit, a near field communication circuit and a mode switch. The flexible circuit board is installed in the casing, and the flexible circuit board includes a plurality of induction coils. At least one of the induction coils is induced with an outer coil to generate an induction current, and one of the induction coils includes an outer coil and an inner coil. The rectifying circuit receives the induced current and rectifies the induced current, and provides a rectified rectified current to a load. The mode switch is connected to the outer coil, the inner coil and the near field communication circuit, the mode switch determines an operation mode of the active pen according to an input signal, and the operation mode includes a charging mode and a near field communication mode . Wherein, when the active pen is in the near field communication mode, the inner coil is disconnected from the outer coil through the mode switch, and connected to the near field communication circuit, so as to communicate with an external electronic device, and when When the active pen is in the charging mode, the inner coil is connected to the outer coil through a mode switch.

The present invention further provides a mode switching method for an active pen, the active pen includes a plurality of induction coils and a near field communication circuit, one of the induction coils includes an outer coil and an inner coil, the The method includes: determining an operation mode of the active pen according to an input signal through a mode switch; when the mode switch receives the input signal, the inner coil is disconnected from the outer coil through the mode switch, and connected to the near field communication circuit, so that the active pen is in a near field communication mode in the operation mode; and when the mode switch does not receive the input signal, the mode switch connects the inner coil to the outer coil, so as to Putting the active pen in a charging mode in the operating mode.

The present invention provides a wireless system including an active pen and a color wheel. The active pen includes an induction coil, a near field communication circuit and a control chip. The control chip is used to control the near field communication circuit and the induction coil to perform wireless communication with an electronic device. The color wheel includes a plurality of sensing labels, each sensing label has an identification data, and the identification data are different from each other and correspond to a color. Wherein, the control chip controls the near field communication circuit and the induction coil to sense one of the inductive tags, so as to obtain the identification data of the one of the inductive tags, and the control chip passes the near field communication circuit and the induction coil transmits the identification data to the electronic device.

The present invention provides an active pen, which includes a flexible circuit board and a plurality of induction coils arranged on the flexible circuit board. The flexible circuit board is installed in the casing of the active pen in a bending manner, and the installation position of the induction coils Each relative position of the casing is covered, so that when the user places the active pen on a wireless charging pad, the active pen can be charged without aligning the active pen with the wireless charging pad. Therefore, the problem in the prior art that the active pen is easy to roll when placed on the wireless charging board and cannot be accurately aligned, which affects the charging efficiency of the active active pen, is solved.

Description of drawings

1 is a schematic diagram of an active pen according to an embodiment of the present invention;

FIG. 2 is a block diagram of an active pen according to an embodiment of the present invention; and

3 is a schematic cross-sectional view of an active pen and a wireless charging pad according to an embodiment of the present invention;

4 is a schematic cross-sectional view of a flexible circuit board according to another embodiment of the present invention;

5 is a schematic cross-sectional view of an active pen and a wireless charging pad according to another embodiment of the present invention;

6 is a schematic cross-sectional view of an active pen placed in an electronic device according to another embodiment of the present invention;

7 is a schematic diagram of a wireless system according to an embodiment of the present invention;

8 is a schematic diagram of an active pen and a portable electronic device according to an embodiment of the present invention; and

FIG. 9 is a flowchart of a method for switching modes according to an embodiment of the present invention.

Description of reference numbers:

100, 100A, 100B, 100C active pen;

102, 102B shell;

104, 104A, 104B flexible circuit boards;

106 control circuit board;

108 load;

110, 110-1, 110-2, 110-3, 110-4, 110-5, 110-6, 110-n induction coils;

110A outer coil;

110B inner coil;

112 control chip;

114 rectifier circuit;

116 power management circuit;

118 near field communication circuit;

120, 120-1 first induction coil;

122, 122-1, 122-2 second induction coils;

124 main rectifier;

126 rectifiers;

128 second magnetic elements;

200 wireless charging pad;

300 electronic devices;

301 accommodating slot;

303 the first magnetic element;

400 wireless systems;

500 portable electronic devices;

600 color discs;

601, 602, 603, 604 induction tags;

A, B, C nodes;

BT button;

SW1 mode switch;

SW2 charging mode switch;

S1, S2 coverage;

TX charging coil;

Steps S100, S102, S104, S106, S108, S110, S112, S114, S116.

Detailed ways

In order to make the above-mentioned features and advantages of the present invention more obvious and easy to understand, the following embodiments are given and described in detail with the accompanying drawings as follows.

The use of the same reference numbers in the figures refers to the same or similar elements. These examples are intended to illustrate the general principles of the invention and should not be construed in a limiting sense. Detailed descriptions of well-known functions and structures will be omitted to avoid obscuring the subject matter of the present invention.

It is noted that references to different "an" or "one" embodiment in this disclosure are not necessarily the same embodiment, and references are to at least one. Furthermore, when a particular feature, structure or characteristic is described in conjunction with an embodiment, it will be appreciated that a person of ordinary skill, whether described in detail or not, can use such feature, structure or characteristics within the knowledge of the art. or features are linked to the remaining embodiments.

Please refer to FIGS. 1 and 2 . FIG. 1 is a schematic diagram of an active pen 100 according to an embodiment of the present invention, and FIG. 2 is a block diagram of an active pen 100 according to an embodiment of the present invention. The active pen 100 includes a casing 102 , a flexible circuit board 104 , a control circuit board 106 and a load 108 . The casing 102 can accommodate the flexible circuit board 104 and the control circuit board 106 therein. In this embodiment, the housing 102 is a hexagonal cylinder as shown in the figure, but it is not limited to this, and may have other shapes, such as a polygonal cylinder or a cylinder. The flexible circuit board 104 is installed in the casing 102 in a crimping manner, and the flexible circuit board 104 includes a plurality of induction coils 110 for inducting with external coils (not shown in the figure) to generate an induction current. Here In the embodiment, the flexible circuit board 104 includes six induction coils 110-1, 110-2, 110-3, 110-4, 110-5 and 110-6. The control circuit board 106 can receive the induced current to charge the load 108. In this embodiment, the load 108 is a rechargeable battery, such as a lithium ion battery (Li-ion), but not limited thereto. Therefore, the load 108 can provide the power required by the active pen 100 when it is used.

The control circuit board 106 is electrically connected to the induction coil 110 of the flexible circuit board 104 . The control circuit board 106 includes a control chip 112 , a rectifier circuit 114 , a power management circuit 116 and a near field communication circuit 118 . The control chip 112 is electrically connected to the induction coil 110 , the near field communication circuit 118 and the rectifier circuit 114 . The control chip 112 is used for monitoring the magnetic induction of each induction coil 110 and controlling the operation of the rectifier circuit 114 and the near field communication circuit 118 . The rectifier circuit 114 rectifies the induced current generated by the induction coil 110 to output the rectified current to the power management circuit 116 . Next, the power management circuit 116 converts the rectified current into an appropriate voltage and supplies it to the load 108 , so as to charge the load 108 stably.

Furthermore, the control circuit board 106 of the active pen 100 may further include a mode switch SW1 , and the active pen 100 may further include a button BT disposed on the casing 102 . For example, as shown in FIG. 1 , the button BT can be disposed on the right end of the casing 102 , and the button BT is electrically connected to the mode switch SW1 . The mode switch SW1 is electrically connected to one of the induction coils 110 . For example, as shown in FIG. 2 , the mode switch SW1 is connected to the induction coil 110 - 1 and the near field communication circuit 118 , and the induction coil 110 - 1 includes an outer coil 110A and an inner coil 110B. A node A of the mode switch SW1 is connected to the outer coil 110A, a node B is connected to the inner coil 110B, and a node C is connected to the near field communication circuit 118 .

The button BT can send an input signal to the mode switch SW1, and the mode switch SW1 determines the operation mode of the active pen 100 according to the input signal, which includes a charging mode and a near field communication mode. For example, when the user presses the button BT, the button BT sends the input signal to the mode switching switch SW1, so that the operation mode of the active pen 100 is the near field communication mode. At this time, the node B of the mode switch SW1 is connected to the node C, that is, the inner coil 110B is connected to the near field communication circuit 118 through the mode switch SW1, and the inner coil 110B is used as an induction coil for communication. Therefore, the control chip 112 can control the near field communication circuit 118 and the inner coil 110B to communicate with an external electronic device with a near field communication function, such as a notebook computer, a smart phone, a tablet computer and other devices with a near field communication chip. communication.

Furthermore, when the user presses the button BT again and the mode switch SW1 receives the input signal, the operation mode of the active pen 100 is switched to the charging mode. At this time, the node B of the mode switch SW1 is connected to the node A, that is, the inner coil 110B is connected to the outer coil 110A through the mode switch SW1. At this time, the outer coil 110A and the inner coil 110B can jointly serve as an induction coil of a wireless charging receiving end.

Please also refer to FIG. 3 . FIG. 3 is a schematic cross-sectional view of an active pen 100 and a wireless charging pad 200 according to an embodiment of the present invention. In this embodiment, the housing 102 is a hexagonal cylinder with 6 sides. The flexible circuit board 104 is bent and disposed in the housing 102 so that the induction coils 110 correspond to and face the six sides of the hexagonal cylinder respectively. When the active pen 100 is placed on the wireless charging pad 200 and in the charging mode, the control chip 112 can monitor that the magnetic induction of the induction coil 110 - 4 is the largest, that is, the charging coil TX closest to the wireless charging pad 200 . Therefore, the control chip 112 can transmit the induced current generated by the induction coil 110-4 induced by the charging coil TX to the rectifier circuit 114, and the rectifier circuit 114 rectifies the induced current into a rectified current output to the power management circuit 116, and then The current power management circuit 116 then converts the rectified current into an appropriate voltage and supplies it to the load 108 , so as to stably charge the load 108 . It is worth noting that, since the casing 102 is a hexagonal cylinder and an induction coil 110 is correspondingly disposed on each side, the user does not need to connect the active pen 100 to the wireless charging pad 200 for charging when the user places the active pen 100 on the wireless charging pad 200 for charging. To align the wireless charging board 200 , it is only necessary to directly place the active pen 100 on the wireless charging board 200 .

Please refer to FIG. 4 , which is a schematic cross-sectional view of a flexible circuit board 104A according to another embodiment of the present invention. As shown in the figure, in this embodiment, the flexible circuit board 104A includes a plurality of first induction coils 120 and a plurality of second induction coils 122, and the first induction coils 120 are disposed on an inner side of the flexible circuit board 104A 1041 , the second induction coil 122 is disposed on an outer side surface 1043 of the flexible circuit board 104 . It is worth noting that the installation position of the first induction coil 120 overlaps the installation position of the second induction coil 122 . For example, the coverage area S2 of the leftmost second induction coil 122 in FIG. 4 overlaps the coverage area S1 of the two left first induction coils 120 .

Please refer to FIG. 2 and FIG. 5 . FIG. 5 is a schematic cross-sectional view of the active pen 100A and the wireless charging pad 200 according to an embodiment of the present invention. In this embodiment, the casing 102 is a cylinder, and the flexible circuit board 104A is bent into a ring and disposed in the casing 102 . As in the previous embodiment, when the user wants to place the active pen 100A on the wireless charging pad 200 for charging, there is no need to align the active pen 100A with the wireless charging pad 200 , but only directly place the active pen 100A on the wireless charging pad 200 can be. As shown in FIG. 5 , among the first induction coil 120 and the second induction coil 122 , the lowermost first induction coil 120 - 1 is induced by the charging coil TX to generate the largest amount of magnetic induction. Therefore, the control chip 112 transmits the induced current generated by the induction coil 120-1 induced by the charging coil TX to the rectifier circuit 114, and the rectifier circuit 114 rectifies the induced current into a rectified current and outputs it to the power management circuit 116, and then the current power management circuit 116 The rectified current is then converted into an appropriate voltage and supplied to the load 108 , so as to stably charge the load 108 .

In addition, a physical charging mode switch SW2 (as shown in FIG. 1 ) can be further disposed on the casing 102 for switching the charging mode of the active pen 100A, which includes a normal charging mode and a fast charging mode. The rectifier circuit 114 may include a main rectifier 124 and a secondary rectifier 126 . If the active pen 100A is in the normal charging mode when the charging mode switch SW2 is not pressed by the user, the control chip 112 will only enable the main rectifier 124 to receive a first pulse generated by the first induction coil 120-1. A current is induced and a first rectified current is output, and then the power management circuit 116 receives the first rectified current rectified by the main rectifier 124 to charge the load 108 . When the charging mode switching switch SW2 is pressed by the user, the active pen 100A is in the fast charging mode and the charging mode switching switch SW2 will transmit a switching signal to the control chip 112, and the control chip 112 will enable the sub-rectifier 126 according to the switching signal . At this time, the main rectifier 124 receives the first induction current generated by the first induction coil 120-1 to output a first rectified current, and the secondary rectifier 126 receives the second induction coils on both sides of the first induction coil 120-1 A second induced current and a third induced current generated by 122-1 and 122-2 are used to output a second rectified current and a third rectified current. The power management circuit 116 receives the first rectified current, the second rectified current and the third rectified current rectified by the main rectifier 124 and the secondary rectifier 126, and then converts it into an appropriate voltage and supplies it to the load 108 for charging, so as to achieve purpose of fast charging. Therefore, users can choose the required charging mode according to their own needs.

Please refer to FIG. 6 , which is a schematic cross-sectional view of an active pen 100B placed in an electronic device 300 according to another embodiment of the present invention. In this embodiment, the active pen 100B is inserted into an accommodating slot 301 of the electronic device 300 . Two charging coils TX and two first magnetic elements 303 are respectively disposed around the accommodating slot 301 . The inner side of the casing 102B of the active pen 100B is correspondingly provided with two second magnetic elements 128 for generating magnetic attraction with the two first magnetic elements 303 , so that the active pen 100B can achieve the purpose of positioning when it is inserted into the accommodating slot 301 . The active pen 100B includes two induction coils 110, which are disposed on the inner side of the flexible circuit board 104B, and when the active pen 100B is inserted into the accommodating slot 301 for positioning, the positions of the two induction coils 110 are aligned with the two charging coils TX, and further The purpose of inducing the two charging coils TX to the two induction coils 110 to generate an induced current to charge the active pen 100B is achieved. The first magnetic element 303 can be one of an N-type magnet or an S-type magnet, and the second magnetic element 128 can be the other of an N-type magnet or an S-type magnet.

Please refer to FIG. 7 , which is a schematic diagram of a wireless system 400 according to an embodiment of the present invention. The wireless system 400 may include a portable electronic device 500, a color wheel 600, and an active pen 100C. The active pen 100C may have an induction coil 110 - 1 , a near field communication circuit 118 and a control chip 112 as shown in FIG. 2 , and the active pen 100C operates in a near field communication mode. The control chip 112 can be used to control the near field communication circuit 118 and the induction coil 110 - 1 to perform wireless communication with a near field communication chip (not shown in the figure) in the portable electronic device 500 .

The color wheel 600 includes a plurality of inductive labels, each of which may be constituted by a near field communication coil. In this embodiment, the color wheel 600 includes sensor labels 601 , 602 , 603 and 604 , and each sensor label has an identification data, and each identification data is different from each other and corresponds to a color. For example, sensor label 601 corresponds to red, sensor label 602 corresponds to green, sensor label 603 corresponds to blue, and sensor label 604 corresponds to white. When the user wants to write in red on the portable electronic device 500, the active pen 100C can be brought close to the sensing tag 601 for sensing, and the control chip 112 can communicate with the sensing tag 601 through the near field communication circuit 118 and the sensing coil 110-1. Induction is performed to obtain identification data corresponding to red. Next, the control chip 112 transmits the identification data to the near field communication chip of the portable electronic device 500 through the near field communication circuit 118 and the induction coil 110 - 1 , and the near field communication chip then delivers the identification data to the portable electronic device 500 A central processing unit (not shown in the figure) of the device executes corresponding software and controls a display screen of the portable electronic device 500, so that when the user uses the active pen 100C to perform touch input on the display screen of the portable electronic device 500 You can use red handwriting.

In addition, please refer to FIG. 8 , which is a schematic diagram of an active pen 100C and a portable electronic device 500 according to an embodiment of the present invention. In this embodiment, the control chip 112 of the active pen 100C may store a piece of data of the user. When the active pen 100C operates in the near field communication mode and the user brings the active pen 100C close to the portable electronic device 500 , the control chip 112 transmits the business card data to the portable electronic device 500 through the near field communication circuit 118 and the induction coil 110 - 1 , and the business card data is displayed on the display screen of the portable electronic device 500 by executing the corresponding software through the central processing unit of the portable electronic device 500 . Then the user can use the active pen 100C to touch the display screen to perform functions such as signing, altering or deleting the business card data.

Please refer to FIG. 2 and FIG. 9 . FIG. 9 is a flowchart of a method for switching modes according to an embodiment of the present invention. In step S100, an operation mode of the aforementioned active pen is determined according to an input signal through a mode switch SW1. When the user presses the button BT, the button BT will generate the input signal to the mode switch SW1. When receiving the input signal, the mode switch SW1 will be connected to the near field communication circuit 118 and the inner coil 110B, so that the active pen operates the A near field communication mode of operation mode. When the user does not press the button BT and the mode switch SW1 does not receive the input signal, the mode switch SW1 will connect the inner coil 110B to the outer coil 110A, so that the active pen can be charged in the operation mode. model. In step S102, when the active pen is in the near field communication mode, the induction coil 110-1 induces an external communication coil (for example, inducts a communication coil inside the portable electronic device 500 in FIG. 7), Thereby, a communication path is established. In step S104, the control chip 112 of the active pen communicates with an electronic device (such as the aforementioned portable electronic device 500) through the communication path.

In step S106, when the active pen is in the charging mode, one of the induction coils 110 conducts induction with an external charging coil (eg, the aforementioned charging coil TX). In step S108 , the control chip 112 enables the main rectifier 124 of the rectifier circuit 114 , and the main rectifier 124 receives a first induced current of one of the induction coils 110 and outputs a first rectified current. In step S110, the control chip 112 determines that the active pen is in the fast charging mode or the normal charging mode according to a switching signal, wherein the switching signal is generated by the charging mode switching switch SW2. In step S112 , when the control chip 112 determines that the active pen is in the normal charging mode, the power management circuit 116 only receives the first rectified current rectified by the main rectifier 124 to charge the load 108 .

In step S114 , when the control chip 112 determines that the active pen is in the fast charging mode, the control chip 112 also activates a secondary rectifier 126 of the rectifier circuit 114 , wherein the secondary rectifier 126 receives the phase of the induction coil 110 . A second induced current and a third induced current of the two adjacent induction coils output a second rectified current and a third rectified current. In step S116 , the power management circuit 116 receives the first rectified current, the second rectified current and the third rectified current rectified by the main rectifier 124 and the secondary rectifier 126 , so as to charge a load 108 .

Compared with the prior art, the present invention provides an active pen, which includes a flexible circuit board and a plurality of induction coils disposed thereon, the flexible circuit board is installed in the casing of the active pen in a bending manner, and The placement positions of the induction coils cover various relative positions of the casing, so that when the user places the active pen on a wireless charging pad, the active pen can be charged without aligning the active pen with the wireless charging pad. . Therefore, the problem in the prior art that the active pen is easy to roll when placed on the wireless charging board and cannot be accurately aligned, which affects the charging efficiency of the active active pen, is solved.

It will be understood that the elements and features recited in the claims may be combined in various ways to yield new claims and also within the scope of the present invention. Accordingly, where a claim depends on only a single independent claim or a dependent claim, it is to be understood that these dependent claims may optionally be dependent on any preceding or following claim, And this new combination should be construed as forming a part of the specification of the present invention.

While the present invention has been described by way of example and preferred embodiment, it is to be understood that the invention is not limited thereto. Those of ordinary skill in the art can still make various substitutions or modifications without departing from the scope and spirit of the present invention. Accordingly, the scope of the invention should be defined and protected by the appended claims and their equivalents.

Claims (11)

1. An active pen, comprising: a shell; A flexible circuit board installed in the casing, the flexible circuit board includes a plurality of induction coils, at least one of the induction coils is induced with an external coil to generate an induction current, and one of the induction coils Including an outer coil and an inner coil; a rectifier circuit, receiving the induced current and rectifying the induced current, and providing a rectified rectified current to a load; a near field communication circuit; and a mode switch connected to the outer coil, the inner coil and the near field communication circuit, the mode switch determines an operation mode of the active pen according to an input signal, the operation mode includes a charging mode and a near field communication model; Wherein, when the active pen is in the near field communication mode, the inner coil is disconnected from the outer coil through the mode switch, and connected to the near field communication circuit, so as to communicate with an external electronic device, and when When the active pen is in the charging mode, the inner coil is connected to the outer coil through a mode switch. 2 . The active pen according to claim 1 , wherein the housing is a corner column, and the flexible circuit board is bent and disposed in the housing, so that the induction coils correspond to the corner columns respectively. 3 . multiple sides. 3 . The active pen of claim 2 , wherein the casing is a cylinder, the flexible circuit board is disposed in the casing in a ring shape, and the induction coil includes a plurality of first induction coils. 4 . coils and a plurality of second induction coils, the first induction coils are arranged on an inner side of the flexible circuit board, the second induction coils are arranged on an outer side of the flexible circuit board, and the first induction coils are arranged on an inner side of the flexible circuit board. The setting position overlaps the setting position of the second induction coil. 4 . The active pen according to claim 1 , wherein the active pen further comprises a power management circuit and a control chip, a charging mode switch is arranged on the casing, and the rectifier circuit comprises a main rectifier and a control chip. 5 . a pair of rectifiers, when the charging mode switch is not pressed, the control chip only enables the main rectifier, so as to receive a first induced current of one of the induction coils and output a first rectified current, the active When the pen is in a normal charging mode, the power management circuit receives the first rectified current rectified by the main rectifier to charge the load, and when the charging mode switch is pressed, the active pen is in a fast charging mode, the The charging mode switching switch transmits a switching signal to the control chip, and the control chip activates the sub-rectifier according to the switching signal, so as to receive one of two adjacent induction coils of the induction coil in the normal charging mode of the induction coils The second induced current and a third induced current output a second rectified current and a third rectified current, the power management circuit receives the first rectified current and the second rectified current rectified by the main rectifier and the secondary rectifier and the third rectified current to charge the load. 5 . The active pen of claim 1 , wherein at least one first magnetic element is further disposed on the casing, and when the active pen is disposed on or in an electronic device, the at least one first magnetic element The element and the at least one second magnetic element of the electronic device are attracted to each other, so that the induction coils are respectively aligned with the plurality of charging coils located in the electronic device. 6. A method of switching modes for an active pen, the active pen comprising a plurality of induction coils and a near field communication circuit, one of the induction coils comprising an outer coil and an inner coil, the method comprising : Determine an operation mode of the active pen according to an input signal through a mode switch; When the mode switch receives the input signal, the inner coil is disconnected from the outer coil through the mode switch, and connected to the near field communication circuit, so that the active pen can perform a near field communication in the operation mode mode; and When the mode switch does not receive the input signal, the mode switch connects the inner coil to the outer coil, so that the active pen is in a charging mode in the operation mode. 7. The method of claim 6, wherein the active pen further comprises a rectifier circuit, a control chip, a power management circuit and a load, the method further comprising: When the active pen is in the charging mode, induce induction with an external charging coil through one of the induction coils; A main rectifier of the rectifier circuit is activated by the control chip, and the main rectifier receives a first induced current of the induction coil of the induction coil which induces an external charging coil and outputs a first rectified current; Determine, by the control chip, that the active pen is in a fast charging mode or a normal charging mode; and When the control chip determines that the active pen is in the normal charging mode, the power management circuit only receives the first rectified current rectified by the main rectifier to charge the load. 8. The method for switching modes according to claim 7, further comprising: When the control chip determines that the active pen is in the fast charging mode, the control chip also activates a secondary rectifier of the rectifier circuit, wherein the secondary rectifier receives the induction of the induction coil and an external charging coil. A second induced current and a third induced current of two adjacent induction coils of the coil output a second rectified current and a third rectified current; and The first rectified current, the second rectified current and the third rectified current rectified by the main rectifier and the secondary rectifier are received by the power management circuit, thereby charging a load. 9. The method for switching modes according to claim 6, further comprising: When the active pen is in the near field communication mode, one of the induction coils induces an external communication coil to establish a communication path; and The active pen further includes a control chip, and the control chip communicates with an external electronic device through the communication path, wherein the electronic device includes the communication coil. 10 . The method of claim 7 , wherein the step of judging by the control chip that the active pen is in the fast charging mode or the normal charging mode further comprises: 10 . The control chip determines that the active pen is in the fast charging mode or the normal charging mode according to a switching signal, wherein the switching signal is generated by a charging mode switching switch, and the charging mode switching switch is arranged on the active pen. 11. A wireless system comprising: 1. The active pen of claim 1, comprising: an induction coil; a near field communication circuit; and a control chip for controlling the near field communication circuit and the induction coil to wirelessly communicate with an electronic device; and A color palette, including: a plurality of sensing tags, each sensing tag has an identification data, and the identification data are different from each other and correspond to a color; Wherein, the control chip controls the near field communication circuit and the induction coil to sense one of the inductive tags, so as to obtain the identification data of the one of the inductive tags, and the control chip passes the near field communication circuit and the induction coil transmits the identification data to the electronic device.

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