Abstract:
A chargeable device is disclosed. The chargeable device of the present invention comprises a main circuit module with a coil, and at least one integrated circuit module with a compensation capacitor operated with the coil.

Description:
FIELD OF THE INVENTION 
       [0001]    The present invention relates to a chargeable device, and particularly to a wireless chargeable device. 
       BACKGROUND OF THE INVENTION 
       [0002]    For the convenience of the users, more and more functions are integrated to one device. For example, a mobile phone is integrated with functions of wireless network communication, multimedia display, radio frequency identification (RFID), near field communication (NFC), and etc. Moreover, for the product design integrity, waterproofness, and the convenience for charging, more and more devices are designed with function of wireless charging. 
         [0003]    In general, for mobile communication system, wireless network communication system, RFID system, NFC system, and wireless charging system, each system comprises individual antenna or coil for receiving and transmitting signal. It is difficult to integrate so many systems in a small device. Furthermore, to prevent each system from electromagnetic interference is also a big problem for the designers and engineers. 
       SUMMARY OF THE PRESENT INVENTION 
       [0004]    It is an objective of the present invention to provide a chargeable device, particularly a wireless chargeable device. 
         [0005]    It is another objective of the present invention to provide a chargeable device which comprises a plurality of circuit modules operated with the same coil. 
         [0006]    The present invention provides a chargeable device, comprising: an audio driving circuit for amplifying an audio signal; a wirewound speaker having a coil and a diaphragm, wherein the coil is connected to the audio driving circuit; and a battery charging circuit connected to the coil for charging a battery. 
         [0007]    In one embodiment of the present invention, the chargeable device further comprises a compensation capacitor connected between the battery charging circuit and a ground. 
         [0008]    In one embodiment of the present invention, the chargeable device further comprises a radio frequency (RF) circuit connected to the coil. 
         [0009]    In one embodiment of the present invention, the RF circuit is selectively one of a radio frequency identification (RFID) circuit or a near field communication (NFC) circuit. 
         [0010]    In one embodiment of the present invention, the chargeable device further comprises a compensation capacitor connected between the RF circuit and a ground. 
         [0011]    In one embodiment of the present invention, the wirewound speaker is selectively one of a built-in speaker or an earphone. 
         [0012]    In one embodiment of the present invention, the chargeable device further comprises a magnetic conducting layer coated on a surface of the diaphragm. 
         [0013]    In one embodiment of the present invention, the chargeable device is selectively one of a mobile phone, a walkie-talkie, a multimedia player, a tablet PC, or a Bluetooth earphone. 
         [0014]    In one embodiment of the present invention, the chargeable device further comprises a switch, wherein one end of the switch is connected to the coil, the other end of the switch is selectively switched to connect with one of the audio driving circuit or the battery charging circuit. 
         [0015]    The present invention further provides a chargeable device, comprising: a coil; an RF circuit connected to the coil for receiving or transmitting RF signals; and a battery charging circuit connected to the coil for charging a battery. 
         [0016]    In one embodiment of the present invention, the chargeable device further comprises a first compensation capacitor and a second compensation capacitor, wherein the first compensation capacitor is connected between the battery charging circuit and a ground, the second compensation capacitor is connected between the RF circuit and the ground. 
         [0017]    In one embodiment of the present invention, the RF circuit is selectively one of an RFID circuit or an NFC circuit. 
         [0018]    In one embodiment of the present invention, the chargeable device further comprises a switch connected between the coil and the battery charging circuit. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0019]      FIG. 1  is schematic equivalent circuit diagram of a chargeable device in accordance with one embodiment of the present invention. 
           [0020]      FIG. 2  is a schematic structure diagram of a chargeable device in accordance with the embodiment shown in  FIG. 1 . 
           [0021]      FIG. 3  is a schematic diagram of a chargeable device in accordance with another embodiment of the present invention. 
           [0022]      FIG. 4  is a schematic diagram of a chargeable device in accordance with one embodiment of the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0023]    Referring to  FIG. 1  and  FIG. 2 , a schematic equivalent circuit diagram and a schematic structure diagram of a chargeable device in accordance with one embodiment of the present invention is illustrated. In the present embodiment, the chargeable device  10  comprises an audio driving circuit  12 , a wirewound speaker  13 , and a battery charging circuit  14 . The wirewound speaker  13  comprises a coil  131  and a diaphragm  133 . 
         [0024]    The audio driving circuit  12  receives audio signal, amplifies the audio signal and outputs the amplified audio signal to the wirewound speaker  13 . When the audio signal passes through the coil  131  of the wirewound speaker  13 , the diaphragm  133  is driven to vibrate and generate voice according to the audio signal. 
         [0025]    The coil  131  of the wirewound speaker  13  can be used as an induction coil. When the coil  131  is exposed to a varying magnetic filed, an electromotive force is induced in the coil  131 . The current driven by the electromotive force is rectified and regulated by the battery charging circuit  14  for charging the battery  16 . In one embodiment of the present invention, the audio driving circuit  12  and the battery charging circuit  14  is controlled by the operation system (not shown) to be enabled or disabled. When the audio driving circuit  12  is operated, the battery charging circuit  14  is disabled. When the battery charging circuit  14  is operated, the audio driving circuit  12  is disabled. 
         [0026]    In one embodiment of the present invention, the chargeable device  10  further comprises a compensation capacitor  141 . One end of the compensation capacitor  141  is connected to the battery charging circuit  14 , the other end of the compensation capacitor  141  is grounded. The compensation capacitor  141  is used for adjusting or matching the circuit to a proper operation frequency, and enhancing the efficiency of the battery charging circuit  14 . 
         [0027]    In one embodiment of the present invention, the wirewound speaker  13  is selectively one of a built-in speaker or an earphone. 
         [0028]    In one embodiment of the present invention. the wirewound speaker  13  further comprises a magnetic conducting layer  135  coated on the surface of the diaphragm  133 . By using the magnetic conducting layer  135 , the magnetic field of a greater region is conducted to pass through the coil  131  to enhance the efficiency of battery charging. 
         [0029]    In one embodiment of the present invention, the chargeable device  10  further comprises a switch  18  for switching the coil  131  to connect with the audio driving circuit  12  or the battery charging circuit  14 . 
         [0030]    Referring to  FIG. 3 , a schematic diagram of a chargeable device in accordance with another embodiment of the present invention is illustrated. In the present embodiment, the structure of the chargeable device  30  is substantially the same as the embodiments shown in  FIG. 1  and  FIG. 2 , wherein the chargeable device  30  of the present embodiment further comprises a radio frequency (RF) circuit  32  connected to the coil  131  of the wirewound speaker  13 . The coil  131  can be used to receive or transmit RF signals for the RF circuit  32 . 
         [0031]    In one embodiment of the present invention, the RF circuit  32  is selectively one of a radio frequency identification (RFID) circuit or a near field communication (NFC) circuit. 
         [0032]    In one embodiment of the present invention, the chargeable device  30  further comprises a compensation capacitor  321 . One end of the compensation capacitor  321  is connected to the RF circuit  32  the other end of the compensation capacitor  321  is grounded. The compensation capacitor  321  is used for impedance matching and adjusting the operation frequency of the circuit. 
         [0033]    In at least one of the aforementioned embodiments of the present invention, the chargeable device  10 ,  30  is selectively one of a mobile phone, a walkie-talkie, a multimedia player, a tablet PC, or a Bluetooth earphone. 
         [0034]    Referring to  FIG. 4 , a schematic diagram of a chargeable device in accordance with one embodiment of the present invention is illustrated. In the present embodiment, the chargeable device  40  comprises a coil  43 , a battery charging circuit  42  and an RF circuit  46 . The RF circuit  46  is connected to the coil  43  and is able to receive or transmit RF signals by using the coil  43 . 
         [0035]    The battery charging circuit  42  is also connected to the coil  43 . When the coil  43  is exposed to a varying magnetic filed. an electromotive force is induced in the coil  43 . The current driven by the electromotive force is rectified and regulated by the battery charging circuit  42  for charging the battery  44 . In the present embodiment, the RF circuit  46  and the battery charging circuit  42  are controlled by the system to be enabled or disabled. When the RF circuit  46  is operated, the RF circuit  46  is enabled and the battery charging circuit  42  is disabled. On the other hand, when the battery charging circuit  42  is operated, the RF circuit  46  is disabled and the battery charging circuit  42  is enabled. 
         [0036]    In one embodiment of the present invention, the chargeable device  40  further comprises a first compensation capacitor  421  and a second compensation capacitor  461 . One end of the first compensation capacitor  421  is connected to the battery charging circuit  42  and the other end is grounded. The first compensation capacitor  421  is configured to adjust the operation frequency of the circuit and enhance the efficiency of battery charging. One end of the second compensation capacitor  461  is connected to the RF circuit  46  and the other end is grounded. The second compensation capacitor  461  is used for adjusting the operation frequency and impedance matching. 
         [0037]    In one embodiment of the present invention, the chargeable device  40  further comprises a switch  48  connected between the coil  43  and the battery charging circuit  42 . The battery charging circuit  42  can be selectively connected to or disconnected with the coil  43 . 
         [0038]    In one embodiment of the present invention, the dam-shaped structure  461  is selectively formed by one process of screen printing, imprinting, transfer printing, jet printing, etching, die casting, injection molding, or the combination thereof. 
         [0039]    By using the structure of the present invention, the device that integrates battery charging circuit, audio driving circuit or RF circuit and comprises a requisite coil, such as the coil of a wirewound speaker, the induction coil of the battery charging circuit, or the coil antenna of the RF circuit, can use one coil to operate all functions of the device. Such that, the material and cost for the device production are reduced and the electromagnetic interference between the modules is prevented. 
         [0040]    Although particular embodiments of the invention have been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the scope of the appended claims.