Abstract:
A charging pad capable of charging a receiver according to a predetermined procedure is disclosed. The charging pad may have a plurality of charging coils and a controller for selecting an appropriate coil for charging the receiver. The receiver communicates with the charging pad via NFC, thereby indicating to the charging pad the appropriate procedure for charging the receiver. The controller then selects the appropriate coil and directs charging according to the appropriate procedure.

Description:
FIELD OF THE INVENTION 
       [0001]    This invention generally relates to a method and apparatus for wirelessly charging a variety of equipments or devices, each of which may require charging according to different standards or procedures. 
       BACKGROUND OF THE INVENTION 
       [0002]    Many equipments or devices, including, for example, mobile phones and electronic equipment, to name but a few, contain rechargeable batteries. An increasingly popular method of recharging such rechargeable batteries is wireless or inductive charging. An example of the use of wireless charging is provided in U.S. Pat. No. 8,212,518. It is common to refer to the charging apparatus as the “transmitter” or “charging pad” or “pad” and to the device or equipment being charged as the “receiver”. 
         [0003]    Unfortunately, there are different standards and procedures for charging electronic equipments or devices. Consequently, effective charging can only be accomplished when the electronic equipment or device is matched with a charger that charges according to the standard or procedure specified by the maker of the equipment or device. For example, various standards may differ in the principles of power transfer, frequencies used, presence of device detection, and communication protocols. 
       SUMMARY OF THE INVENTION 
       [0004]    A charging pad for charging various receivers each of which may require charging according to a different procedure or standard is disclosed. Also, a method of charging a receiver which may require charging according to a predetermined procedure is disclosed. In more particular, a method of charging a receiver by a charging pad, the receiver having NFC functionality and being capable of being charged according to a predetermined procedure, and the charging pad being capable of charging according to any of a plurality of different procedures is disclosed. This method includes: transmitting via NFC information from the receiver to the charging pad about the predetermined procedure, causing the charging pad to charge the receiver according to the predetermined procedure. Further, the method may include a charging pad having a plurality of charging coils; the use of a controller capable of choosing at one of the charging coils for charging according to the predetermined procedure and the use of at least one transmitter connected to at least one charging coil. In one embodiment, the charging pad includes an NFC tag for receiving information about the receiver. 
         [0005]    Further contemplated is a charging pad having an NFC tag, the tag being capable of receiving information from a receiver and a plurality of charging coils. Such charging pad may have a plurality of charging coils and may have a controller for receiving information from the tag and selecting at least one of the charging coils for charging the receiver. The charging pad may have at least one transmitter connected to at least one of the charging coils. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0006]      FIG. 1  is a circuit diagram of an illustrative embodiment of the invention. 
       
    
    
     DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS 
       [0007]    In an illustrative embodiment the present invention provides a transmitter  10  with a plurality of charging coils  22 ,  23 , and  24 . Each coil may be of a different shape and configuration so that it is adapted to facilitate charging according to at least one standard or procedure that is different in some respect from the standard or procedure that is associated with another coil. 
         [0008]    Coil  22  is connected directly or indirectly to transmitter  12 ; coil  23  is connected directly or indirectly to transmitter  13 ; and coil  24  is connected directly or indirectly to transmitter  14 . A greater or lesser number of coils and transmitters is possible. 
         [0009]    Reference numeral  21  denotes a Near Field Communication (NFC) antenna. NFC typically involves transmission centered at 13.56 MHz. NFC applications may utilize two antennas, one antenna located upon an initiator, and the other located upon a target. The initiator may generate an RF field that can power a passive target (which is sometimes a tag). In the present embodiment, NFC antenna  21  is connected to passive NFC tag  11 . 
         [0010]    Reference number  31  denotes a controller which is capable of receiving information from the passive NFC tag  11  and also providing control for transmitters  12 ,  13 , and  14 . Controller  31  may, for example, control the power transfer characteristics, frequencies, and other charging parameters of transmitters  12 ,  13 , and  14 . 
         [0011]    In operation, an equipment or device (i.e. receiver)  40  requiring charging according to a particular standard, for example “standard X” is brought into proximity or contact with transmitter  10 . In many applications, receiver  40  is placed upon transmitter  10  which has the external shape of a pad—and is often called a “pad”. Receiver  40  contains a battery  43 ; and an antenna  41  which is capable of transmitting a “charge me according to standard X” command via NFC; and coil  42  which is capable of absorbing electromagnetic energy and delivering it via circuitry not shown to battery  43 , thereby facilitating recharging of battery  43 . 
         [0012]    Thus, receiver  40  transmits a “charge me according to standard X” command which is received by tag  21 . The command is transmitted via tag  21  to controller  31  which determines if it has been configured or programmed to provide charging according to standard X. If controller  31  has been configured or programmed to provide charging according to standard X, it then provides charging direction to one or more of transmitters  12 ,  13 , or  14  so that charging is accomplished according to standard X. If controller  31  has not been configured or programmed to provide charging according to standard X, it may provide such information to the user via a signal on pad  10  or a signal transmitted to receiver  40 . 
         [0013]    Pad  10  may be in deep sleep mode or even turned off completely. Then when pad  10  receives the “charge me according to Standard X” command, it may be turned on and controller  31  may direct the charging as described above. 
         [0014]    Various exemplary embodiments are described in reference to specific illustrative examples. The illustrative examples are selected to assist a person of ordinary skill in the art to form a clear understanding of, and to practice the various embodiments. However, the scope of systems, structures and devices that may be constructed to have one or more of the embodiments, and the scope of methods that may be implemented according to one or more of the embodiments, are in no way confined to the specific illustrative examples that have been presented. On the contrary, as will be readily recognized by persons of ordinary skill in the relevant arts based on this description, many other configurations, arrangements, and methods according to the various embodiments may be implemented. 
         [0015]    The present invention has been described with respect to particular embodiments and with reference to certain drawings, but the invention is not limited thereto, but rather, is set forth only by the claims. The drawings described are only schematic and are non-limiting. In the drawings, for illustrative purposes, the size of various elements may be exaggerated and not drawn to a particular scale. It is intended that this invention encompasses inconsequential variations in the relevant tolerances and properties of components and modes of operation thereof. Imperfect practice of the invention is intended to be covered. 
         [0016]    Where the term “comprising” is used in the present description and claims, it does not exclude other elements or steps. Where an indefinite or definite article is used when referring to a singular noun, e.g. “a” “an” or “the”, this includes a plural of that noun unless something otherwise is specifically stated. Hence, the term “comprising” should not be interpreted as being restricted to the items listed thereafter; it does not exclude other elements or steps, and so the scope of the expression “a device comprising items A and B” should not be limited to devices consisting only of components A and B. This expression signifies that, with respect to the present invention, the only relevant components of the device are A and B.