TW201533561A - Portable computer and wireless keyboard and tablet - Google Patents

Abstract

A portable computer, and the wireless keyboard and the tablet of the portable computer are provided. The wireless keyboard includes a controller, a first wireless communication circuit and a wireless power receiver. The tablet includes a processor, a second wireless communication circuit, a battery and a wireless power transmitter. The wireless power transmitter can convert electrical energy provided by the battery into wireless electrical energy. The wireless power receiver of the wireless keyboard receives the wireless electrical energy provided by the tablet, and converts the wireless electrical energy to operation power for powering the wireless keyboard. Wherein, the controller powered by the wireless power receiver transmits key signal of the wireless keyboard to the processor of the tablet through the first wireless communication circuit and the second wireless communication circuit.

Description

Portable computer and wireless keyboard and tablet

The present invention relates to a portable electronic device, and more particularly to a portable computer, and a wireless keyboard and tablet computer.

Tablet PCs are nowadays popular consumer electronics. Since the tablet does not have a keyboard, the user needs to connect an external keyboard to the tablet in the application scenario where a large amount of text is input. Existing tablets may be powered by a wired transmission (such as USB) to an external keyboard. Some experience may be that it is inconvenient to connect an external keyboard to a tablet using a wire.

Connecting to a tablet using a wireless keyboard is another solution. Since the external keyboard is designed wirelessly, the existing wireless keyboard needs to be equipped with a battery to supply the operating power required for the internal components of the wireless keyboard. Batteries often result in increased cost of existing wireless keyboards and are not lightweight.

The invention provides a portable computer, and a wireless keyboard and a tablet computer. Since the tablet can provide wireless power to the wireless keyboard, the wireless keyboard can be configured without a battery.

Embodiments of the present invention disclose a portable computer, including a wireless keyboard and a tablet computer. The wireless keyboard includes a controller, a first wireless communication circuit, and a wireless power receiver. The tablet includes a processor, a second wireless communication circuit, a battery and a wireless power transmitter. The wireless power transmitter converts the power provided by the battery into wireless power. The wireless power receiver of the wireless keyboard receives the wireless power provided by the tablet and converts the wireless energy into operating power to power the wireless keyboard. The controller is powered by the wireless power receiver, and transmits the key signal of the wireless keyboard to the processor of the tablet through the first wireless communication circuit and the second wireless communication circuit.

Embodiments of the present invention disclose a wireless keyboard including a controller, a wireless communication circuit, and a wireless power receiver. The wireless communication circuit is coupled to the controller. The wireless power receiver receives the wireless power provided by the tablet external to the wireless keyboard and converts the wireless energy into operating power to power the wireless keyboard. The controller is powered by the wireless power receiver, and transmits a button signal of the wireless keyboard to the tablet through a wireless communication circuit.

Embodiments of the present invention disclose a tablet computer including a processor, a wireless communication circuit, a battery, and a wireless power transmitter. The wireless communication circuit is coupled to the wireless communication circuit. The wireless power transmitter is coupled to the battery to convert the power provided by the battery into a wireless keyboard that can be externally supplied to the tablet. Wherein the wireless key The disk is powered by the wireless power, and the key signal of the wireless keyboard is transmitted to the processor through the wireless communication circuit.

Based on the above, since the tablet can provide wireless power to the wireless keyboard, the wireless keyboard can be configured without a battery. A wireless keyboard without a battery can at least achieve the benefits of reduced cost, light weight, and the like. Moreover, since the wireless keyboard without the battery does not need to be charged, there is no problem that the power connector is exposed, so that the wireless keyboard without the battery can further improve the waterproof performance.

The above described features and advantages of the invention will be apparent from the following description.

100‧‧‧ portable computer

110‧‧‧Wireless energy

200‧‧‧ tablet

210‧‧‧ processor

220‧‧‧Wireless communication circuit

230‧‧‧Battery

240‧‧‧Wireless power transmitter

241‧‧‧DC to AC circuit

242‧‧‧Power amplifier circuit

243, 341‧‧‧ coil

244‧‧‧ switch

245‧‧‧Oscillator

250‧‧‧magnetic induction device

300‧‧‧Wireless keyboard

310‧‧‧Keyboard array

320‧‧‧ Controller

330‧‧‧Wireless communication circuit

340‧‧‧Wireless power receiver

342‧‧‧Rectifier

343‧‧‧Regulator

344‧‧‧Input capacitance

345‧‧‧output capacitor

350‧‧‧Foldable top cover

351‧‧‧First section

352‧‧‧second section

360‧‧‧ keyboard body

370‧‧‧ Magnet

S1005~S1035‧‧‧Steps

FIG. 1 is a block diagram showing a circuit of a portable computer according to an embodiment of the invention.

2A is a block diagram showing the circuit of the wireless power transmitter shown in FIG. 1 according to an embodiment of the invention.

2B is a block diagram showing the circuit of the wireless power transmitter shown in FIG. 1 according to another embodiment of the present invention.

FIG. 3A is a block diagram showing the circuit of the wireless power receiver shown in FIG. 1 according to an embodiment of the invention.

FIG. 3B is a block diagram showing the circuit of the wireless power receiver shown in FIG. 1 according to another embodiment of the present invention.

4 is a schematic diagram showing the alignment of a coil of a tablet computer and a coil of a wireless keyboard according to an embodiment of the invention.

FIG. 5 is a schematic diagram of disassembly of a portable computer according to an embodiment of the invention.

FIG. 6 and FIG. 7 are schematic diagrams showing the situation in which the portable computer is in an open state at different viewing angles according to an embodiment of the invention.

8A-8D are schematic side views showing the portable computer from an open state to a closed state according to an embodiment of the invention.

FIG. 9 is a schematic diagram showing a situation in which a portable computer is in a closed state according to an embodiment of the invention.

FIG. 10 is a schematic diagram showing the operation of a tablet computer according to an embodiment of the invention.

The term "coupled" as used throughout the specification (including the scope of the patent application) may be used in any direct or indirect connection. For example, if the first device is described as being coupled to the second device, it should be construed that the first device can be directly connected to the second device, or the first device can be connected through other devices or some kind of connection means. Connected to the second device indirectly. In addition, wherever possible, the elements and/ Elements/components/steps that use the same reference numbers or use the same terms in different embodiments may refer to the related description.

FIG. 1 is a block diagram showing a circuit of a portable computer 100 according to an embodiment of the invention. The portable computer 100 includes a tablet 200 and a wireless keyboard 300. The tablet 200 includes a processor 210, a wireless communication circuit 220, a battery 230, and a wireless power transmitter 240. The wireless communication circuit 220 can provide the external information transmission interface of the tablet 200. The wireless communication circuit 220 can conform to one or more communication interface circuits of wireless communication specifications, such as infrared (IR), bluetooth, near field communication (NFC) or other wireless communication interface circuits. The wireless communication circuit 220 is coupled to the processor 210. The processor 210 can communicate with an external device (e.g., the wireless keyboard 300) via the wireless communication circuit 220.

Battery 230 can supply the operational power required by internal components of tablet 200 (e.g., processor 210, wireless communication circuitry 220, etc.). The wireless power transmitter 240 is coupled to the battery 230. The wireless power transmitter 240 can convert the electrical energy provided by the battery 230 into wireless energy 110 to the wireless keyboard 300 external to the tablet 200. Among them, the wireless keyboard 300 is a batteryless electronic device. The wireless keyboard 300 is powered by the wireless power 110, and transmits the key signal of the wireless keyboard 300 to the processor 210 of the tablet 200 through the wireless communication circuit 330 and the wireless communication circuit 220.

The wireless keyboard 300 includes a keyboard key array 310, a controller 320, a wireless communication circuit 330, and a wireless power receiver 340. The wireless power receiver 340 receives the wireless power 110 provided by the tablet 200 external to the wireless keyboard 300 and converts the wireless power 110 into operating power to power the internal components of the wireless keyboard 300. For example, the wireless power receiver 340 can use the wireless power 110 to supply the keyboard key array 310, the controller 320, the wireless communication circuit 330, and other internal elements of the wireless keyboard 300. The required operating energy for the piece. Therefore, the wireless keyboard 300 can be configured without a battery. The wireless keyboard 300 without a battery can at least obtain the benefits of cost reduction, weight reduction, and the like. Moreover, since the wireless keyboard 300 without the battery does not need to be charged, there is no problem that the power connector is exposed, so that the wireless keyboard 300 without the battery can further improve the waterproof performance.

The keyboard key array 310 is coupled to the controller 320. The keyboard key array 310 can detect whether the user presses the physical button in the button array and transmits the corresponding button signal to the controller 320. The controller 320 can be a keyboard controller (KBC), a microcontroller (Microcontroller) or other control circuit. The wireless communication circuit 330 is coupled to the controller 320. The controller 320 is powered by the wireless power receiver 340, and transmits the key signal of the wireless keyboard 300 to the processor 210 of the tablet 200 through the wireless communication circuit 330 and the wireless communication circuit 220.

FIG. 2A is a block diagram showing the circuit of the wireless power transmitter 240 of FIG. 1 according to an embodiment of the invention. The wireless power transmitter 240 includes a DC to AC conversion circuit 241, a power amplifier circuit 242, and a coil 243. The DC input terminal of the DC-to-AC circuit 241 is coupled to the battery 230. The AC output terminal of the DC-to-AC circuit 241 is coupled to the input of the power amplifier circuit 242. The DC-to-AC circuit 241 can convert the DC current supplied from the battery 230 into an AC current and output the AC current to the power amplifying circuit 242. The output of the power amplifying circuit 242 is coupled to the coil 243. The power amplifying circuit 242 can discharge the AC power output by the DC-to-AC circuit 241. Large, then the amplified AC power is delivered to the coil 243. Thus, the amplified AC power can be transmitted via coil 243 to peripheral devices external to tablet 200, such as wireless keyboard 300.

FIG. 2B is a block diagram showing the circuit of the wireless power transmitter 240 of FIG. 1 according to another embodiment of the present invention. The embodiment shown in Fig. 2B can be analogized with reference to the related description of Fig. 2A. In the present embodiment, the DC-to-AC circuit 241 includes a switch 244 and an oscillator 245. The first end of the switch 244 is coupled to the positive terminal of the battery 230 as a DC input of the DC to AC circuit 241. The second end of the switch 244 is coupled to the power input of the oscillator 245. The ground terminal of the oscillator 245 is coupled to the secondary terminal of the battery 230. The power output of the oscillator 245 is coupled to the input of the power amplifying circuit 242 as an AC output of the DC-to-AC circuit 241.

Switch 244 is controlled by processor 210. When the switch 244 is turned on, the oscillator 245 can convert the direct current provided by the battery 230 into an alternating current and output the alternating current to the power amplifying circuit 242. The power amplifying circuit 242 can amplify the AC power output from the oscillator 245 and then transmit the amplified AC power to the coil 243. Thus, the amplified AC power can be transmitted via coil 243 to peripheral devices external to tablet 200, such as wireless keyboard 300.

FIG. 3A is a block diagram showing the circuit of the wireless power receiver 340 of FIG. 1 according to an embodiment of the invention. The wireless power receiver 340 includes a coil 341, a rectifier 342, and a regulator 343. The coil 341 can sense/receive the radio energy 110 provided by any device external to the wireless keyboard 300 (e.g., the tablet 200), and correspondingly generate an alternating current induced current. AC of rectifier 342 The input end is coupled to the coil 341. Rectifier 342 can be any type of rectifying circuit, such as a full bridge rectifying circuit, a half bridge rectifying circuit, or other rectifier. The rectifier 342 receives the AC induced current generated by the coil 341 and converts the AC induced current into a direct current. The input end of the regulator 343 is coupled to the DC output of the rectifier 342 to receive the DC current output by the rectifier 342. Since the DC current output from the rectifier 342 still has an AC component, the regulator 343 can filter out the AC component and output a stable power supply voltage. Thus, the output of the voltage regulator 343 can be powered to internal components of the wireless keyboard 300, such as the controller 320, the wireless communication circuit 330, and the keyboard key array 310.

FIG. 3B is a block diagram showing the circuit of the wireless power receiver 340 of FIG. 1 according to another embodiment of the present invention. The embodiment shown in FIG. 3B can be analogized with reference to the related description of FIG. 3A. In the present embodiment, the wireless power receiver 340 includes a coil 341, a rectifier 342, a voltage regulator 343, an input capacitor 344, and an output capacitor 345. The coil 341 can sense/receive the radio energy 110 provided by any device external to the wireless keyboard 300 (e.g., the tablet 200), and correspondingly generate an alternating current induced current. The AC input of the rectifier 342 is coupled to the coil 341. In this embodiment, the rectifier 342 can be a full bridge rectifier circuit including four diodes (as shown in FIG. 3B). The rectifier 342 receives the AC induced current generated by the coil 341 and converts the AC induced current into a direct current.

The first end and the second end of the input capacitor 344 are respectively coupled to the DC output terminal and the DC input terminal of the rectifier 342. The input of the regulator 343 receives the DC current output by the rectifier 342. The first end and the second end of the output capacitor 345 are respectively coupled to The output of the regulator 343 is coupled to the DC input of the rectifier 342. Thus, the output of the voltage regulator 343 can provide a stable supply voltage to internal components of the wireless keyboard 300, such as the keyboard key array 310, the controller 320, or other internal components.

The coil 243 and the coil 341 may be a spiral coil or other type of coil. For example, FIG. 4 is a schematic diagram illustrating the alignment of the coil 243 of the tablet computer 200 and the coil 341 of the wireless keyboard 300 in accordance with an embodiment of the present invention. The alternating current flowing through the coil 243 generates a magnetic field in the vicinity of the coil 243. When the coil 243 of the tablet computer 200 and the coil 341 of the wireless keyboard 300 are close to each other, the coil 341 generates an alternating current due to the magnetic field supplied from the coil 243. The alternating current of the coil 341 can be supplied to the wireless keyboard 300.

FIG. 5 is a schematic diagram of disassembly of the portable computer 100 according to an embodiment of the invention. FIG. 6 and FIG. 7 are schematic diagrams showing the context of the portable computer 100 in an open state according to an embodiment of the present invention. 8A-8D are schematic side views showing the portable computer 100 from an open state to a closed state according to an embodiment of the invention. FIG. 9 is a perspective view showing the portable computer 100 in a closed state according to an embodiment of the invention. The embodiment shown in FIGS. 6 to 9 can be analogized with reference to the related description of FIGS. 1 to 3B.

Referring to FIG. 5, the tablet 200 has a display surface and a back surface opposite to the display surface. The coil 243 can be disposed on the back of the tablet 200. In other embodiments, the coil 243 may be disposed on the side of the tablet 200. The wireless keyboard 300 further includes a foldable upper cover 350 and a keyboard body 360. The keyboard key array 310 can be disposed on the upper surface of the keyboard body 360. The keyboard body 360 has a first side and a relative On the second side of the first side. The foldable upper cover 350 is pivoted on the first side of the keyboard body 360. The foldable upper cover 350 is rotatable relative to the keyboard body 360. The tablet 200 is adapted to be coupled to a foldable upper cover 350. The means by which the tablet 200 is coupled to the foldable upper cover 350 is not limited in this embodiment. For example, the foldable top cover 350 may be attached to the tablet 200 by a click, a resilient hook, a magnetic attraction, a slide rail, a sticker, a screw, or other means. An application scenario in which the tablet 200 is coupled to the foldable top cover 350 can be seen in FIG. The coil 341 of the wireless power receiver 340 may be disposed on the foldable upper cover 350 to receive the wireless energy 110 emitted by the tablet 200.

The foldable upper cover 350 can be implemented in any manner. For example, in the present embodiment, the foldable upper cover 350 includes a first section 351 and a second section 352. Referring to FIGS. 5-7 , the coil 341 of the wireless power receiver 340 may be disposed on the first section 351 of the foldable upper cover 350 . The tablet 200 can be configured on the first section 351. The means by which the tablet 200 is connected to the first section 351 is not limited in this embodiment. For example, the first section 351 may be coupled to the tablet 200 by a cassette, a resilient hook, a magnetic attraction, a slide rail, a sticker, a screw, or other means. When the tablet 200 is connected to the first section 351, since the coil 243 of the tablet 200 and the coil 341 of the wireless keyboard 300 are close to each other (as shown in FIG. 4), the coil 341 can receive the coil 243 of the tablet 200. The emitted radio energy 110. The electrical energy received by coil 341 can be supplied to wireless keyboard 300.

The second section 352 connects the first section 351 with the first side of the keyboard body 360. There is a first pivot between the first section 351 and the second section 352. The first section 351 is rotatable relative to the second section 352 along the first pivot to be foldable The upper cover 350 is bent. The second section 352 has a second pivot between the first side of the keyboard body 360. The second section 352 is rotatable relative to the keyboard body 360 along the second pivot.

The magnet 370 can be embedded in the second section 352 of the foldable upper cover 350. The magnet 370 is used to trigger the tablet 200 to enter the power saving mode. The magnetic induction device 250 can be disposed on the back of the tablet 200. The magnetic sensing device 250 (eg, a Hall sensor or other sensor) is electrically coupled to the processor 210 of the tablet 200. The processor 210 can sense whether the magnet 370 is approaching/away from the tablet 200 through the magnetic sensing device 250. Therefore, the tablet 200 can sense whether the second section 352 of the foldable upper cover 350 is approaching/away from the tablet 200 through the magnetic sensing device 250. When the tablet 200 is placed on the foldable top cover 350, the first section 351 of the foldable top cover 350 connects the back of the tablet 200. When the portable computer 100 is in the on state, the tablet 200 is moved away from the tablet 200 by the second section 352 of the foldable upper cover 350 (as shown in FIGS. 6 to 7). At this time, the tablet 200 can return from the power saving mode (for example, the display panel off state, the sleep state, the sleep state, or the like) to the normal operation state according to the sensing result of the magnetic sensing device 250.

8A to 8D, a side view of the portable computer 100 from an open state to a closed state is illustrated. When the tablet computer 200 is superimposed on the keyboard main body 360 with its display surface facing the keyboard main body 360, the foldable upper cover 350 and the keyboard main body 360 respectively cover opposite sides (display surface and back surface) of the tablet computer 200, so that the tablet computer 200 is provided. The clip is placed between the foldable upper cover 350 and the keyboard body 360, as shown in FIG. Shown. At this time, the foldable upper cover 350 and the keyboard main body 360 can protect the tablet 200 from scratches or collisions. On the other hand, when the portable computer 100 is in the closed state, the second section 352 of the foldable upper cover 350 approaches the tablet 200 (as shown in FIG. 9). At this time, the tablet 200 can automatically enter the power saving mode (for example, the display panel off state, the sleep state, the sleep state, or the like) from the normal operation state according to the sensing result of the magnetic sensing device 250.

FIG. 10 is a flow chart showing the operation of the tablet computer 200 according to an embodiment of the invention. The embodiment shown in FIG. 10 can be analogized with reference to the related description of FIGS. 1 through 9. In step S1005, the tablet 200 enters a normal operating state, for example, being powered on or leaving a sleep state. In step S1010, the switch 244 shown in FIG. 2B is in a non-conducting state. Step S1015 can determine whether the magnet 370 is approaching/away from the magnetic sensing device 250. When the magnet 370 is still close to the magnetic induction device 250, the switch 244 remains in a non-conducting state. When the magnetic induction device 250 detects that the magnetic force of the magnet 370 has disappeared, step S1020 is performed.

In step S1020, the tablet 200 prompts a message through the touch display panel to inquire whether the user needs to use the wireless keyboard 300. If it is determined in step S1020 that the user does not need to use the wireless keyboard 300, step S1030 is executed. When the user selects to use the wireless keyboard 300, the switch 244 shown in FIG. 2B is in an on state (step S1025). At this time, the tablet 200 can generate the wireless power 110 to supply power to the wireless keyboard 300.

Step S1030 can determine whether the magnet 370 is approaching/away from the magnetic sensing device 250. When the magnetic induction device 250 does not detect the magnetic force of the magnet 370, the switch 244 remains in the conducting state. When the magnet 370 approaches the magnetic induction device 250, step S1035 is performed. In step S1035, the switch 244 shown in FIG. 2B is in a non-conducting state.

In summary, the tablet 200 of the embodiment of the present invention is configured with a wireless power transmitter 240. Since the wireless power transmitter 240 of the tablet 200 can provide the wireless power 110 to the wireless keyboard 300, the wireless keyboard 300 can replace the battery with the wireless power receiver 340. The wireless keyboard 300 without a battery can at least obtain the benefits of cost reduction, weight reduction, and the like. Moreover, the wireless keyboard 300 without the battery does not need to be charged without the power connector being disposed on the surface of the keyboard body 360. Since the surface of the keyboard body 360 has no power connector, the wireless keyboard 300 without the battery can further improve its waterproof performance.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any one of ordinary skill in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of the invention is defined by the scope of the appended claims.

100‧‧‧ portable computer

110‧‧‧Wireless energy

200‧‧‧ tablet

210‧‧‧ processor

220‧‧‧Wireless communication circuit

230‧‧‧Battery

240‧‧‧Wireless power transmitter

300‧‧‧Wireless keyboard

310‧‧‧Keyboard array

320‧‧‧ Controller

330‧‧‧Wireless communication circuit

340‧‧‧Wireless power receiver

Claims (23)

A portable computer comprising: a wireless keyboard, the wireless keyboard comprising a controller, a first wireless communication circuit and a wireless power receiver; and a tablet computer comprising a processor and a second wireless a communication circuit, a battery and a wireless power transmitter, the wireless power transmitter converting the power provided by the battery into a wireless power; wherein the wireless power receiver of the wireless keyboard receives the radio provided by the tablet And capable of converting the radio energy into an operating power to power the wireless keyboard; and wherein the controller is powered by the wireless power receiver through the first wireless communication circuit and the second wireless communication circuit The button signal of the wireless keyboard is transmitted to the processor of the tablet. The portable computer of claim 1, wherein the wireless power transmitter comprises: a coil; a power amplifying circuit, the output end of which is coupled to the coil; and the always flowing AC circuit, the DC input end thereof The AC output of the DC-to-AC circuit is coupled to the input end of the power amplifier circuit. The portable computer of claim 2, wherein the DC-to-AC circuit comprises: a switch having a first end serving as the DC input terminal of the DC-to-AC circuit; And an oscillator having a power input coupled to the second end of the switch, and a power output of the oscillator as the AC output of the DC-to-AC circuit. The portable computer of claim 1, wherein the wireless power receiver comprises: a coil; a rectifier having an AC input coupled to the coil; and a voltage regulator having an input coupled To the DC output of the rectifier, the output of the regulator is powered to the controller and the first wireless communication circuit. The portable computer of claim 4, wherein the wireless power receiver further comprises: an input capacitor, wherein the first end and the second end are respectively coupled to the DC output end of the rectifier and the DC current And an output capacitor, wherein the first end and the second end are respectively coupled to the output end of the voltage regulator and the DC input end of the rectifier. The portable computer of claim 1, wherein the wireless keyboard comprises: a keyboard body having a first side and a second side opposite to the first side; and a foldable upper cover, Positioning on the first side of the keyboard body, the foldable upper cover is rotatable relative to the keyboard body, and the tablet is adapted to be coupled to the foldable upper cover; The coil of the wireless power receiver is disposed on the foldable upper cover to receive the wireless power emitted by the wireless power transmitter of the tablet. The portable computer of claim 6, wherein the foldable upper cover comprises: a first segment, the tablet is disposed on the first segment; and a second segment connecting the a first section and the first side of the keyboard body, wherein the first section and the second section have a first pivot, the first section being movable relative to the first pivot The second section is rotated to cause the foldable upper cover to be bent, and the second section has a second pivot between the first side of the keyboard body, the second section being along the first The two pivots rotate relative to the keyboard body. The portable computer of claim 7, wherein the foldable upper cover further comprises: a coil disposed in the first section for receiving the wireless power to supply the wireless keyboard. The portable computer of claim 7, wherein the foldable upper cover further comprises: a magnet disposed in the second section for triggering the tablet to enter a power saving mode. The portable computer of claim 6, wherein the foldable upper cover is adapted to be connected to the tablet by magnetic attraction. The portable computer of claim 6, wherein the tablet has a display surface and a back surface opposite to the display surface, the foldable top cover Connected to the back of the tablet, when the tablet is overlaid on the keyboard body with the display surface facing the keyboard body, the foldable upper cover and the keyboard body cover the tablet. A wireless keyboard includes: a controller; a wireless communication circuit coupled to the controller; and a wireless power receiver, receiving a wireless power provided by a tablet external to the wireless keyboard, and the wireless energy Converting to an operating power to power the wireless keyboard; wherein the controller is powered by the wireless power receiver, and transmitting a key signal of the wireless keyboard to the tablet through the wireless communication circuit. The wireless keyboard of claim 12, wherein the wireless power receiver comprises: a coil; a rectifier having an AC input coupled to the coil; and a voltage regulator having an input coupled to the The DC output of the rectifier, the output of the regulator is powered to the controller and the wireless communication circuit. The wireless keyboard of claim 13, wherein the wireless power receiver further comprises: an input capacitor, wherein the first end and the second end are respectively coupled to the DC output end and the DC input end of the rectifier And an output capacitor, wherein the first end and the second end are respectively coupled to the input of the voltage regulator The output is connected to the DC input of the rectifier. The wireless keyboard of claim 12, further comprising: a keyboard body having a first side and a second side opposite to the first side; and a foldable upper cover pivotally mounted on the keyboard The first side of the main body, the foldable upper cover is rotatable relative to the keyboard body, and the tablet is adapted to be coupled to the foldable upper cover; wherein a coil of the wireless power receiver is disposed on the foldable Covering the cover to receive the wireless power from the tablet. The wireless keyboard of claim 15, wherein the foldable upper cover comprises: a first section adapted to configure the tablet on the first section; and a second section to be connected The first section and the first side of the keyboard body, wherein the first section and the second section have a first pivot, the first section being movable relative to the first pivot The second section is rotated to cause the foldable upper cover to be bent, and the second section has a second pivot between the first side of the keyboard body, the second section being capable of The second pivot rotates relative to the keyboard body. The wireless keyboard of claim 16, wherein the foldable upper cover further comprises: a coil disposed in the first section for receiving the wireless power to supply the wireless keyboard. The wireless keyboard of claim 16, wherein the foldable type The upper cover further includes: a magnet disposed in the second section for triggering the tablet to enter a power saving mode. The wireless keyboard of claim 15, wherein the foldable upper cover is adapted to be connected to the tablet by magnetic attraction. The wireless keyboard of claim 15 , wherein the tablet has a display surface and a back surface opposite to the display surface; the foldable top cover when the tablet is placed on the foldable upper cover Connecting the back side of the tablet; and when the tablet is overlaid on the keyboard body with the display surface facing the keyboard body, the foldable upper cover and the keyboard body cover the tablet. A tablet computer comprising: a processor; a wireless communication circuit coupled to the processor; a battery; and a wireless power transmitter coupled to the battery to convert the electrical energy provided by the battery into a radio A wireless keyboard external to the tablet; and wherein the wireless keyboard is powered by the wireless power, and the wireless keyboard is transmitted to the processor via the wireless communication circuit. The tablet computer of claim 21, wherein the wireless power transmitter comprises: a coil; a power amplifying circuit, the output end of which is coupled to the coil; A DC-to-AC circuit has a DC input coupled to the battery, and an AC output of the DC-to-AC circuit is coupled to an input of the power amplifier circuit. The tablet computer of claim 22, wherein the DC-to-AC circuit comprises: a switch having a first end serving as the DC input terminal of the DC-to-AC circuit; and an oscillator having a power input terminal coupled thereto Connected to the second end of the switch, and the power output of the oscillator acts as the AC output of the DC-to-AC circuit.