TW201738697A - Wireless system, active stylus and method for switching modes - Google Patents

Abstract

An active stylus includes a flexible circuit board, a rectifier circuit, a near field communication circuit and mode switch. 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 inductive current, and one of the induction coil includes an outer coil and an inner coil. The rectifier circuit receives the inductive current and rectifies the inductive current, so as to provide a rectified current to a load. The mode switch determines an operation mode of the active stylus according to an input signal. When the active stylus is at a near field communication mode, the inner coil is disconnected from the outer coil by the mode switch and connected to the near field communication circuit. When the active stylus is at a charging mode, the inner coil is connected to the outer coil through the mode switch.

Description

Wireless system, active pen, and method of switching modes

The present invention relates to an active pen, and more particularly to an active pen that can switch operating modes.

Today's portable electronic devices, such as tablets or smart phones, are widely used in various fields. The user can use the active pen to operate these portable electronic devices. In general, active pens are 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 user's precise input requirements, but must have a power source, such as a battery, to operate.

The active active pen battery 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 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, so that the active active pen is easily rolled when placed on the wireless charging board and cannot be accurately aligned, which affects the active active pen. Charging efficiency, so how to make the active active pen stably achieve the best charging efficiency is a subject worth studying.

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

The invention discloses an active pen comprising a casing, a flexible circuit board, a rectifying circuit, a near field communication circuit and a mode switching switch. The flexible circuit board is mounted in the housing, and the flexible circuit board includes a plurality of induction coils. At least one of the inductive coils is inductively coupled to an external coil to generate an induced current, and one of the inductive coils includes an outer coil and an inner coil. The rectifier circuit receives the induced current and rectifies the induced current, and provides a rectified one of the rectified currents to a load. The mode switching relationship is connected to the outer coil, the inner coil and the near field communication circuit, and the mode switching relationship determines an operating mode of the active pen according to an input signal, the operating mode including 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 via the mode switch, and is connected to the near field communication circuit for communication with an external electronic device. And when the active pen is in the charging mode, the inner coil is connected to the outer coil via a mode switching switch.

The invention further discloses a method for switching modes for an active pen, the active pen comprising a plurality of induction coils and a near field communication circuit, wherein one of the induction coils comprises an outer coil and an inner coil, The method includes: determining, by an input switch, an action of the active pen by using a mode switch When the mode switch receives the input signal, the inner coil is disconnected from the outer coil via the mode switch, and is connected to the near field communication circuit, so that the active pen is in the operation mode. a near field communication mode; and when the mode switch does not receive the input signal, the mode switch connects the inner coil to the outer coil to cause the active pen to be in one of the charging modes in the operating mode.

The invention provides a wireless system comprising 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 wirelessly communicate with an electronic device. The color wheel comprises a plurality of sensing tags, each sensing tag has an identification data, and each of the identification data is different from each other and corresponds to a color. The control chip controls the near field communication circuit and the induction coil senses one of the inductive tags to obtain the identification data of the one of the inductive tags, and the control chip is used by the near field communication The circuit and the induction coil transmit the identification data to the electronic device.

The present invention provides an active pen comprising a flexible circuit board and a plurality of induction coils disposed thereon, the flexible circuit board being flexibly mounted in the housing of the active pen, and the induction coils The setting position covers the relative positions of the housings, so that when the user places the active pen on a wireless charging board, the active pen can be charged without aligning the active pen with the wireless charging board. Therefore, in the prior art, when the active pen is placed on the wireless charging board, it is easy to roll and cannot be accurately aligned, which affects the charging efficiency of the active active pen.

100, 100A, 100B, 100C‧‧‧ active pen

102, 102B‧‧‧ housing

104, 104A, 104B‧‧‧ flexible circuit board

106‧‧‧Control circuit board

108‧‧‧load

110, 110-1, 110-2, 110-3, 110-4, 110-5, 110-6, 110-n‧‧‧ induction coil

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 coil

124‧‧‧Main rectifier

126‧‧‧Sub rectifier

128‧‧‧Second magnetic component

200‧‧‧Wireless charging board

300‧‧‧Electronic devices

301‧‧‧ accommodating slots

303‧‧‧First magnetic component

400‧‧‧Wireless system

500‧‧‧Portable electronic devices

600‧‧‧ color plate

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‧‧

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 FIG. 3 is an active pen and a wireless charging board according to an embodiment of the present invention; FIG. 4 is a cross-sectional view of a flexible circuit board according to another embodiment of the present invention; FIG. 5 is a cross-sectional view of an active pen and a wireless charging board according to another embodiment of the present invention; FIG. 7 is a schematic diagram of a wireless system according to an embodiment of the present invention; FIG. 8 is a schematic diagram of an active pen and a portable type according to an embodiment of the present invention; A schematic diagram of an electronic device; and FIG. 9 is a flow chart of a method for switching modes according to an embodiment of the present invention.

Various embodiments of the invention are described in detail in the associated drawings. The same reference numbers are used in the drawings to refer to the same or similar elements. The 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 should be noted that the different "one" or "" mentioned in the present invention An embodiment is not necessarily the same embodiment, and is referred to as at least one. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is recognized that Such features, structures, or characteristics may be combined with other embodiments within the skill of the art, whether or not described in detail.

Please refer to FIG. 1 and FIG. 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 housing 102, a flexible circuit board 104, a control circuit board 106, and a load 108. The housing 102 can house the flexible circuit board 104 and the control circuit board 106 therein. In this embodiment, the housing 102 is a hexagonal cylinder as shown, but is not limited thereto, and may have other shapes, such as a polygonal cylinder or a cylinder. The flexible circuit board 104 is mounted in the housing 102 in a crimped manner, and the flexible circuit board 104 includes a plurality of induction coils 110 for sensing with an external coil (not shown) for sensing. Current, in this 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 an 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 is not limited thereto. The load 108 can therefore provide the power required to use the active pen 100.

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 to monitor the magnetic induction of each induction coil 110 The quantity and control rectifier circuit 114 and the near field communication circuit 118 actuate. The rectifier circuit 114 rectifies the induced current generated by the induction coil 110 to output a rectified current to the power management circuit 116. Next, the power management circuit 116 converts the rectified current into an appropriate voltage supply to the load 108, thereby stably charging the load 108.

Furthermore, the control circuit board 106 of the active pen 100 may further include a mode switch SW1, and the active ratio 100 may further include a button BT disposed on the housing 102. For example, as shown in FIG. 1 , the button BT can be disposed on the right end of the housing 102 , and the button BT is electrically connected to the mode switching 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. One node A of the mode switching switch SW1 is connected to the outer coil 110A, one node B is connected to the inner coil 110B, and one 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 switch SW1, so that the operation mode of the active pen 100 is in the near field communication mode. At this time, the node B of the mode switching switch SW1 is connected to the node C, that is, the inner coil 110B is coupled to the near field communication circuit 118 via the mode switching switch SW1, and the inner coil 110B is used as an induction coil for communication. Therefore, the control wafer 112 can control the near field communication circuit 118 and the inner coil 110B to have a near field pass with the outside. The electronic device of the function communicates, for example, with a notebook computer having a near field communication chip, a smart phone, a tablet computer, and the like.

Moreover, when the user presses the button BT again, when 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 switching switch SW1 is connected to the node A, that is, the inner coil 110B is coupled to the outer coil 110A via the mode switching switch SW1. At this time, the outer coil 110A and the inner coil 110B can be used together as an induction coil of a wireless charging receiving end.

Please refer to FIG. 3 at the same time. FIG. 3 is a schematic cross-sectional view of the active pen 100 and a wireless charging board 200 according to an embodiment of the present invention. In this embodiment, the housing 102 is a hexagonal cylinder and has six sides. The flexible circuit board 104 is bent and disposed in the housing 102 such that the induction coils 110 respectively correspond to and face the six sides of the hexagonal cylinder. When the active pen 100 is placed on the wireless charging pad 200 and is 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 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 this rectified current into an appropriate voltage supply to the load 108, thereby stably charging the load 108. It should be noted that since the housing 102 is a hexagonal cylinder and an induction coil 110 is disposed on each side, the user does not need to take the active pen 100 when the user places the active pen 100 on the wireless charging board 200 for charging. It is aligned with the wireless charging pad 200 as long as the active pen 100 is directly placed on the wireless charging pad 200.

Please refer to FIG. 4, which is a cross-sectional view of a flexible circuit board 104A according to another embodiment of the present invention. As shown in the figure, in the embodiment, the flexible circuit board 104A includes a plurality of first induction coils 120 and a plurality of second induction coils 122. The first induction coils 120 are disposed on the flexible circuit board 104A. An inner side surface 1041, the second induction coils 122 are disposed on one outer side surface 1043 of the flexible circuit board 104. It should be noted that the positions of the first induction coils 120 are overlapped with the positions of the second induction coils 122. For example, the coverage S2 of the leftmost second induction coil 122 in FIG. 4 overlaps the coverage S1 of the two first induction coils 120 on the left side.

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 housing 102 is a cylinder, and the flexible circuit board 104A is bent into an annular shape in the housing 102. As in the foregoing embodiment, when the user wants to place the active pen 100A on the wireless charging board 200 for charging, it is not necessary to align the active pen 100A with the wireless charging board 200, as long as the active pen 100A is directly placed on the wireless charging board. 200 can be. As shown in FIG. 5, among the first induction coils 120 and the second induction coils 122, the lowest inductance of the first induction coil 120-1 is induced by the charging coil TX, so that the control is performed. The wafer 112 transmits the induced current generated by the induction coil 120-1 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 this rectified current into an appropriate voltage supply to load 108, thereby steadily charging load 108.

In addition, the housing 102 can be additionally provided with a physical charging mode cut. The switch SW2 (shown in FIG. 1) is used to switch the charging mode of the active pen 100A, which includes a normal charging mode and a fast charging mode. The rectifier circuit 114 can include a main rectifier 124 and a secondary rectifier 126. If the charging mode switch SW2 is not pressed by the user, when the active pen 100A is in the normal charging mode, the control chip 112 only activates the main rectifier 124, thereby receiving one of the first induction coils 120-1. The first induced current outputs a first rectified current, and then the power management circuit 116 receives the first rectified current rectified by the main rectifier 124 to charge the load 108. If the charging mode switch SW2 is pressed by the user, the active pen 100A is in the fast charging mode and the charging mode switching switch SW2 transmits a switching signal to the control chip 112, and the control chip 112 activates the secondary rectifier according to the switching signal. 126. At this time, the main rectifier 124 receives the first induced current generated by the first induction coil 120-1 to output a first rectified current, and the sub-rectifier 126 receives the second side of the first induction coil 120-1. The induction coils 122-1 and 122-2 generate a second induced current and a third induced current 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 sub-rectifier 126, and then converts the voltage into an appropriate voltage to be supplied to the load 108 for charging. The purpose of fast charging. Therefore, the user can select the desired charging mode according to his own needs.

Please refer to FIG. 6. FIG. 6 is a schematic cross-sectional view showing the 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 one of the receiving slots 301 of the electronic device 300. Two charging coils TX and two first magnetic components are respectively disposed around the accommodating groove 301 303. The inner side of the housing 102B of the active pen 100B is 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 be inserted into the accommodating groove 301 for positioning. The active pen 100B includes two inductive coils 110 disposed on the inner side of the flexible circuit board 104B. When the active pen 100B is inserted into the receiving slot 301 for positioning, the positions of the two inductive coils are located in the two charging coils TX. It is achieved that the two charging coils TX sense the two induction coils 110 to generate an induced current to charge the active pen 100B. The first magnetic component 303 can be one of an N-type magnet or an S-type magnet, and the second magnetic component 128 is the other of an N-type magnet or an S-type magnet.

Please refer to FIG. 7. FIG. 7 is a schematic diagram of a wireless system 400 according to an embodiment of the present invention. The wireless system 400 can include a portable electronic device 500, a color wheel 600, and an active pen 100C. The active pen 100C can 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 inductive coil 110-1 to wirelessly communicate with a near field communication chip (not shown) in the portable electronic device 500.

The color wheel 600 includes a plurality of inductive tags that are each formed by a near field communication coil. In this embodiment, the color wheel 600 includes the sensing tags 601, 602, 603, and 604, and each of the sensing tags has an identification material, each identification data being different from each other and corresponding to a color. For example, the inductive tag 601 corresponds to red, the inductive tag 602 corresponds to green, the inductive tag 603 corresponds to blue, and the inductive tag 604 corresponds to white. When the user wants to use red writing on the portable electronic device 500, the active pen 100C can be first sensed near the inductive tag 601, and the control chip 112 can be used by the near field communication circuit 118 and the induction coil. The 110-1 senses the inductive tag 601 to obtain identification data corresponding to red. The control chip 112 then transmits the identification data to the near field communication chip of the portable electronic device 500 by 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 A central processing unit (not shown) of the portable electronic device 500, and then executing a corresponding software and controlling a display screen of the portable electronic device 500, so that when the user uses the active pen 100C in the portable electronic device The red handwriting can be used when the display screen of the 500 is touch input.

In addition, please refer to FIG. 8 , which is a schematic diagram of the active pen 100C and the portable electronic device 500 according to an embodiment of the present invention. In this embodiment, one of the user's business card materials can be stored in the control chip 112 of the active pen 100C. When the active pen 100C is operated in the near field communication mode and the user brings the active pen 100C to the portable electronic device 500, the control chip 112 transmits the business card data to the near field communication circuit 118 and the induction coil 110-1. The card is displayed in the portable electronic device 500, and the corresponding software is executed by the central processing unit of the portable electronic device 500 to display the business card data on the display screen of the portable electronic device 500. Then, the user can use the active pen 100C to perform touch on the display screen to sign, modify or delete 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, one of the operating modes of the active pen is determined by a mode switching switch SW1 and according to an input signal. When the user presses the button BT, the button BT generates the input signal to the mode switch SW1. When receiving the input signal, the mode switch SW1 connects the near field communication circuit 118 and the inner coil 110B, so that the active pen operates the One of the operating modes of near field communication mode. When the user does not press the button BT, when the mode switch SW1 does not receive the input signal, the mode switch SW1 connects the inner coil 110B to the outer coil 110A to charge the active pen in one of the operation modes. mode. In step S102, when the active pen is in the near field communication mode, the induction coil 110-1 is sensed with one of the external communication coils (for example, a communication coil inside the portable electronic device 500 in FIG. 7). Inductive) to establish a communication path. In step S104, the control chip 112 of the active pen communicates with an electronic device (such as the portable electronic device 500 described above) through the communication path.

In step S106, when the active pen is in the charging mode, one of the induction coils 110 is sensed by one of the external charging coils (for example, the aforementioned charging coil TX). In step S108, the control wafer 112 activates the main rectifier 124 of the rectifier circuit 114. The main rectifier 124 receives one of the first induction currents of the 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 receives only 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 further activates one of the 114 rectifier circuits, the secondary rectifier 126, wherein the secondary rectifier 126 receives one of the induction coils 110. a second induced current and a third induced current of one of the adjacent two induction coils A second rectified current and a third rectified current are output. In step S116, the power management circuit 116 receives the first rectified current, the second rectified current, and the third rectified current after the main rectifier 124 and the sub-rectifier 126 are rectified, thereby charging a load 108.

Compared with the prior art, the present invention provides an active pen comprising a flexible circuit board and a plurality of induction coils disposed thereon, the flexible circuit board being bent and mounted in the housing of the active pen And the position of the induction coils covers the relative positions of the housings, so that when the user places the active pen on a wireless charging board, the active pen does not need to be aligned with the wireless charging board to make the active pen Charge it. Therefore, in the prior art, when the active pen is placed on the wireless charging board, it is easy to roll and cannot be accurately aligned, which affects the charging efficiency of the active active pen.

It will be understood that the elements and features described in the appended claims can be combined in various ways to produce new claims and are also within the scope of the invention. Therefore, in view of the fact that the attached items attached below are attached only to a single item or a subsidiary item, it can be understood that these items can be selectively attached to any request item before or after it, and this new item Combinations may be understood as forming part of the specification of the invention.

While the invention has been described by way of illustration and preferred embodiments, it is understood that Various alternatives or modifications can be made by those skilled in the art without departing from the scope and spirit of the invention. The scope of the invention is therefore defined and protected by the following claims and their equivalents.

100‧‧‧Active pen

106‧‧‧Control circuit board

108‧‧‧load

110, 110-1, 110-2, 110-3, 110-n‧‧‧ induction coil

110A‧‧‧outer coil

110B‧‧‧ inner coil

112‧‧‧Control chip

114‧‧‧Rectifier circuit

116‧‧‧Power Management Circuit

118‧‧‧ Near Field Communication Circuit

124‧‧‧Main rectifier

126‧‧‧Sub rectifier

A, B, C‧‧‧ nodes

BT‧‧ button

SW1‧‧‧ mode switch

SW2‧‧‧Charging mode switch

Claims (11)

An active pen includes: a housing; a flexible circuit board mounted in the housing, the flexible circuit board includes a plurality of induction coils, and at least one of the induction coils is coupled to an external coil And generating an induced current, and one of the induction coils comprises an outer coil and an inner coil; a rectifier circuit receives the induced current and rectifies the induced current, and provides a rectified current after rectification 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, wherein the mode switching relationship 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 mode; wherein, when the active pen is in the near field communication mode, the inner coil is disconnected from the outer coil via the mode switching switch, and is connected to the near field a communication circuit for communicating with an external electronic device, and when the active pen is in the charging mode, the inner coil is connected to the mode switch via a mode switch Outer coil. The active pen of claim 1, wherein the housing is a corner cylinder, and the flexible circuit board is bent and disposed in the housing, so that the induction coils are respectively The plural side of the corner post. The active pen of claim 2, wherein the housing is a cylinder, and the flexible circuit board is disposed in the housing in an annular shape. The coil includes a plurality of first induction coils and a plurality of second induction coils, wherein the first induction coils are disposed on one inner side of the flexible circuit board, and the second induction coils are disposed on the flexible circuit The outer side of one of the plates is disposed at a position where the first induction coils are disposed to overlap the second induction coils. The active pen of claim 1, wherein the active pen further comprises a power management circuit and a control chip, the housing is provided with a charging mode switching switch, and the rectifier circuit comprises a main rectifier and a pair a rectifier, when the charging mode switch is not pressed, the control chip only activates the main rectifier, thereby receiving one of the first induction currents of one of the induction coils and outputting a first rectified current, the active pen system 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 charging mode switching switch transmits a switching signal to the control chip, and the control chip activates the secondary rectifier according to the switching signal, thereby receiving a second induced current of one of the adjacent two induction coils of the induction coil and a first Three inductive currents and outputting a second rectified current and a third rectified current, the power management circuit receiving the main The rectifier and the first rectified current, the second rectified current, and the third rectified current rectified by the sub-rectifier are used to charge the load. The active pen of claim 1, wherein the housing is further provided with at least one first magnetic component, and when the active pen is disposed on or in an electronic device, the at least one first magnetic component is At least one second magnetic body of the electronic device The sexual elements are attracted to each other such that the inductive coils respectively oppose the plurality of charging coils of the electronic device. A method for 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: Determining an operating mode of the active pen according to an input signal by a mode switching switch; when the mode switching switch receives the input signal, the inner coil is disconnected from the outer coil via the mode switching switch, and is connected to the near a field communication circuit for causing the active pen to be in a near field communication mode in the operating mode; and when the mode switching switch does not receive the input signal, the mode switching switch connects the inner coil to the outer coil to enable the The active pen is in one of the charging modes in the operating mode. The method for switching modes according to claim 6, wherein the active pen further comprises a rectifying circuit, a control chip, a power management circuit and a load, the method further comprising: when the active pen is in the charging In the mode, sensing by one of the inductive coils and one of the external charging coils; and the main rectifier is enabled by the control chip, the main rectifier receiving the one of the inductive coils One of the first induced currents and outputs a first rectified current; the control chip determines 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 receives only the first rectified current rectified by the main rectifier to charge the load. 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 further activates a secondary rectifier of the rectifier circuit, wherein the The secondary rectifier receives a second induced current and a third induced current of one of the adjacent two induction coils of the induction coils and outputs a second rectified current and a third rectified current; and the power management circuit The first rectified current, the second rectified current, and the third rectified current rectified by the main rectifier and the sub-rectifier are received to charge a load. 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 is inducted with one of the external communication coils, The communication chip is configured to communicate with one of the external electronic devices by the communication path, wherein the electronic device includes the communication coil. A method of switching modes as described in claim 7 of the patent scope, wherein The step of determining, by the control chip, that the active pen is in the fast charging mode or the normal charging mode further comprises: determining, by the control chip, that the active pen is in the fast charging mode or the normal charging mode according to a switching signal, The switching signal is generated by a charging mode switching switch, and the charging mode switching relationship is set on the active pen. A wireless system comprising: an active pen 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 wheel The method includes: a plurality of sensing tags, each of the sensing tags having an identification data, each of the identification data being different from each other and corresponding to a color; wherein the control chip controls the near field communication circuit and the induction coils are opposite to the sensing tags The sensing device is configured to obtain the identification data of the one of the sensing tags, and the control chip transmits the identification data to the electronic device by using the near field communication circuit and the induction coil.