Patent Publication Number: US-2022224157-A1

Title: Wireless charging of electronic devices

Description:
PRIORITY INFORMATION 
     This application is a continuation of U.S. application Ser. No. 16/490,663 filed on Sep. 3, 2019, which claims priority to International Application No. PCT/US2017/021280 filed on Mar. 8, 2017. The contents of which are incorporated herein by reference in its entirety. 
    
    
     BACKGROUND 
     Electronic devices, such as laptops, tablets, and smartphones, are used by users for various purposes. Such electronic devices are portable and include a rechargeable battery for powering the electronic device. The rechargeable battery of the electronic devices may be charged wirelessly through electromagnetic induction. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       The following detailed description references the drawings, wherein: 
         FIG. 1  illustrates a block diagram of an electronic device and a charging base for wireless charging, according to an example of the present subject matter; 
         FIG. 2  illustrates a block diagram of an electronic device and a charging base for wireless charging, according to an example of the present subject matter; 
         FIG. 3  illustrates a method of wireless charging a rechargeable battery in an electronic device, according to an example of the present subject matter; 
         FIG. 4  illustrates a method of wireless charging a rechargeable battery in an electronic device, according to an example of the present subject matter; 
         FIG. 5  illustrates a method of wireless charging a rechargeable battery in an electronic device, according to an example of the present subject matter; and 
         FIG. 6  illustrates a system environment implementing a non-transitory computer readable medium for wireless charging, according to an example of the present subject matter. 
     
    
    
     DETAILED DESCRIPTION 
     Electronic devices may include an inductive coil to enable wireless charging. The inductive coil of an electronic device, simply referred to as the coil, may electromagnetically couple with a coil of a charging base, when the electronic device is placed on the charging base. The coil of the charging base may operate as a primary coil and the coil of the electronic device may operate as a secondary coil for electromagnetic induction. The electromagnetic coupling of such coils induces electromagnetic current in the coil of the electronic device. Electromagnetic current induced in the coil can be provided to charge a rechargeable battery of the electronic device. 
     Electronic devices may also include a transceiver for providing near-field communication (NFC) with other devices. The coils in the charging base and in the electronic device for wireless charging may be so arranged such that electromagnetic interactions between the coils may interfere with the NFC. As a result, the quality of NFC may be adversely affected during wireless charging. 
     Electronic devices may also include a touch-pad as an input unit through which touch-based user inputs can be received. The arrangement of coils in the charging base and in the electronic device may be such that electromagnetic interactions between the coils may interfere with functioning of the touch-pad. As a result, the performance of the touch-pad may be adversely affected during wireless charging. 
     Further, a specific region in the electronic device, for example, in the vicinity of the battery of the electronic device or in the vicinity of a processor, may heat up during the operation of the electronic device. The arrangement of coils in the charging base and in the electronic device may be such that electromagnetic interactions between the coils may contribute to heating and thus may overheat that specific region. 
     The present subject matter describes approaches for wireless charging of electronic devices using a charging base. According to an example implementation of the present subject matter, the electronic device includes a first set of coils, and the charging base includes a second set of coils. The first set of coils and the second set of coils may overlap when the electronic device is placed over the charging base. The approaches of the present subject matter involve at least disabling, or switching OFF, a coil in the charging base that may overlap a coil in the electronic device present in a region of NFC, or in a region of touch-pad, or in a region of high temperature in the electronic device, while continuing to wirelessly charge the electronic device through other coils of the charging base. The approaches of the present subject matter facilitate wireless charging of the electronic device without affecting the NFC and the touch-pad functionality, and without overheating of the region of high temperature. 
     In an example implementation, a coil of the first set that is present in a region of NFC in the electronic device may be determined. Accordingly, a message may be sent from the electronic device to the charging base to disable a corresponding coil of the second set which overlaps with the determined coil of the first set. With this, the coil of the charging base which may otherwise interfere with the NFC is disabled, while the wireless charging of the electronic device continues through other coils of the first set and the second set. 
     In an example implementation, a coil of the first set that is present under the touch-pad of the electronic device may be determined. Accordingly, a message may be sent from the electronic device to the charging base to disable a corresponding coil of the second set which overlaps with the determined coil of the first set. With this, the coil of the charging base which may otherwise interfere with the touch-pad functionality is disabled, while the wireless charging of the electronic device continues through other coils of the first set and the second set. 
     In an example implementation, a coil of the first set that is present in a region at a temperature more than a specific temperature may be determined. Accordingly, a message may be sent from the electronic device to the charging base to disable a corresponding coil of the second set which overlaps with the determined coil of the first set. With this, the coil of the charging base which may otherwise cause overheating of the specific region in the electronic device is disabled, while the wireless charging of the electronic device continues through other coils of the first set and the second set. 
     Selective disabling of one or more coils of the charging base, according to the present subject matter, facilitates wireless charging of the electronic device through other coils of the charging base without impacting other operations of the electronic device. 
     The present subject matter is further described with reference to the accompanying figures. Wherever possible, the same reference numerals are used in the figures and the following description to refer to the same or similar parts. It should be noted that the description and figures merely illustrate principles of the present subject matter. It is thus understood that various arrangements may be devised that, although not explicitly described or shown herein, encompass the principles of the present subject matter. Moreover, all statements herein reciting principles, aspects, and examples of the present subject matter, as well as specific examples thereof, are intended to encompass equivalents thereof. 
       FIG. 1  illustrates a block diagram of an electronic device  100  and a charging base  102  for wireless charging, according to an example of the present subject matter. The electronic device  100  may be placed on the charging base  102  for the purpose of wireless charging of the electronic device  100 . The electronic device  100  may include, but is not restricted to, laptops, smartphones, tablets, and the like. 
     The electronic device  100 , as shown, includes a battery  104  and a first set of coils  106 - 1 ,  106 - 2 , . . . ,  106 -N. The battery  104 , for example, is a rechargeable battery. The first set of coils, collectively be referred to as device coils  106 , may be communicatively coupled to the battery  104 . Each of the device coils  106  is individually coupled to the battery  104 . Each of the device coils  106  may provide current, which may be induced or generated in the respective device coils  106 , to the battery  104  for charging the battery  104 . 
     As shown, the charging base  102  includes a second set of coils  108 - 1 ,  108 - 2 , . . . ,  108 -N, collectively referred to as charging coils  108 . When the electronic device  100  is placed on the charging base  102  and current is passed through the charging coils  108 , the charging coils  108  electromagnetically couple with the device coils  106  of the electronic device  100 . The electromagnetic coupling induces or generates electromagnetic current in the device coils  106 . 
     In an example implementation, the number, the size and the arrangement of device coils  106  in the electronic device  100  are the same as the number, the size and the arrangement of charging coils  108  in the charging base  102 . The size and the arrangement are such that each coil of the device coils  106  has one-to-one correspondence with a coil of the charging coils  108 . Thus, when the electronic device  100  is placed on the charging base  102 , each coil of the device coils  106  overlaps a corresponding coil of the charging coils  108 . With reference to  FIG. 1 , the coil  106 - 1  overlaps the coil  108 - 1 , the coil  106 - 2  overlaps the coil  108 - 2 , and so on, when the electronic device  100  is placed on the charging base  102 . With the overlapping arrangement of coils, each pair of overlapping coils  106 - 1  and  108 - 1 ,  106 - 2  and  108 - 2 , . . . , can individually couple electromagnetically for charging the battery  104 . 
     The arrangement of device coils  106  and charging coils  108  is not restricted to the example arrangement shown in  FIG. 1 . Coils can be placed in the electronic device  100  any form of arrangement to facilitate wireless charging of the battery of the electronic device  100 . Coils are placed in the charging base  102  in the same arrangement as those present in the electronic device  100 . 
     The device coils  106  and the charging coils  108 , respectively, may include two or more coils. In an example implementation, the electronic device  100  and the charging base  102 , respectively, include two coils of 20 W each. In an example implementation, the electronic device  100  and the charging base  102 , respectively, include four coils of 10 W each. With four coils, the arrangement of coils may be like a 2×2 grid arrangement. 
     The electronic device  100  further includes a controller  110 . The controller  110  can be implemented through a combination of any suitable hardware and computer-readable instructions. The controller  110  may be implemented in a number of different ways to perform various functions for the purposes of wireless charging of the electronic device  100 . For example, the computer-readable instructions for the controller  110  may be processor-executable instructions stored in a non-transitory computer-readable storage medium, and the hardware for the controller  110  may include a processing resource (e.g., processor(s)), to execute such instructions. In the present examples, the non-transitory computer-readable storage medium stores instructions which, when executed by the processing resource, implements the controller  110 . The electronic device  100  may include the non-transitory computer-readable storage medium storing the instructions and the processing resource (not shown) to execute the instructions. In an example, the non-transitory computer-readable storage medium storing the instructions may be external, but accessible to the processing resource of the electronic device  100 . In another example, the controller  110  may be implemented by electronic circuitry. 
     The processing resource of the electronic device  100  may be implemented as microprocessors, microcomputers, microcontrollers, digital signal processors, central processing units, state machines, logic circuitries, and/or any devices that manipulate signals based on operational instructions. Among other capabilities, the processing resource may fetch and execute computer-readable instructions stored in a non-transitory computer-readable storage medium coupled to the processing resource of the electronic device  100 . The non-transitory computer-readable storage medium may include, for example, volatile memory (e.g., RAM), and/or non-volatile memory (e.g., EPROM, flash memory. NVRAM, memristor, etc.). 
     In an example implementation, the electronic device  100  may include a transceiver (not shown) for performing near-field communication (NFC) between the electronic device  100  and other devices placed in the vicinity. The transceiver may be positioned in the electronic device  100  to perform the NFC through a region  112  of the electronic device  100 . The region  112  may be referred to as the region of NFC. The region of NFC  112  defines a physical space of the electronic device  100  which may enclose circuitry for NFC and through which signals associated with the NFC are transmitted and received by the transceiver. 
     The description hereinafter describes a procedure of wireless charging of the electronic device  100  using the charging base  102 , in accordance with an example implementation. For the purpose of wireless charging of the electronic device  100 , the electronic device  100  is placed on the charging base  102  such that the device coils  106  overlap the charging coils  108 . Upon switching ON the charging base  102 , current is passed through each of the charging coils  108 . The current in the charging coils  108  generates electromagnetic field. The electromagnetic field from the charging coils  108  causes electromagnetic coupling of the charging coils  108  with the device coils  106  to induce electromagnetic current in the device coils  106 . The controller  110  directs the induced electromagnetic current from the device coils  106  to the battery  104  for charging the battery  104 . In an example implementation, the controller  110  may be initially powered by the electromagnetic current induced in the device coils  106 , when the battery  104  is fully depleted. Otherwise the controller  110  may be powered by the battery  104 . 
     In an example implementation, the controller  110  determines a coil, from amongst the device coils  106 , that is present in the region of NFC  112 . The controller  110  may determine the coil that is present in the region of NFC  112  based on the information of placement of device coils  106 . For this, in an example implementation, information with regard to which coil is placed in the region of NFC  112  is stored in a memory (not shown) of the electronic device  100 . The information may be stored at the time of assembling or configuring the electronic device  100 . The information may include an attribute of the coil, for example, the coil number, which is present in the region of NFC  112 . The controller  110  may fetch such information stored in the electronic device  100  to determine the coil that is present in the region of NFC  112 . 
     Upon determining the coil that is present in the region of NFC  112 , the controller  110  sends a message to the charging base  102 , where the message is indicative of disabling a coil, from amongst the charging coils  108 , which overlaps with the determined coil. Such a message may be referred to as a coil-OFF message which may include information indicative of a coil to be disabled. In an example implementation, the charging base  102  receives the coil-OFF message and accordingly disables the coil from amongst the charging coils  108  as indicated by the coil-OFF message. To disable a coil of the charging base  102 , the current supply to the coil may be cut-off so that no electromagnetic current is induced or generated in a corresponding coil of the electronic device  100 . 
     With reference to  FIG. 1 , the controller  110  determines the coil  106 - 1  to be present in the region of NFC  112 , and sends a message to disable the coil  108 - 1 . Once the coil  108 - 1  is disabled, the battery  104  is charged through other coils of the charging base  102  and the electronic device  100  without affecting the NFC that may be performed with the electronic device  100 . 
     In an example implementation, the controller  110  determines, in real-time, whether the transceiver is active for the NFC. When the transceiver is determined to be active, the controller  110  sends the message to the charging base  102  to disable the coil of the charging base  102  which overlaps with the coil of the electronic device  100  present in the region of NFC  112 . Further, when the transceiver is determined to be inactive, the controller  110  sends a message to the charging base, which indicates to enable the coil of charging base  102  which overlaps with the coil of the electronic device  100  present in the region of NFC  112 . Such a message may be referred to as a coil-ON message. In an example implementation, the charging base  102  receives the coil-ON message and accordingly enables the coil of the charging base  102  as indicated by the coil-ON message. To enable a coil of the charging base  102 , the current supply to the coil may be switched ON so that electromagnetic current is induced or generated in a corresponding coil of the electronic device  100 . Disabling and enabling the coil of charging base  102  in real-time depending on whether the transceiver is active or inactive facilitates in efficient and effective wireless charging of the electronic device  100  without affecting the NFC. 
     In an example implementation, charging base  102  also include a controller (not shown). The controller of the charging base  102  can be implemented through a combination of any suitable hardware and computer-readable instructions, in a similar manner as that for the controller  110 , to perform various functions for the purposes of wireless charging of the electronic device  100 . For example, the computer-readable instructions for the controller of the charging base  102  may be processor-executable instructions stored in a non-transitory computer-readable storage medium, and the hardware for the controller of the charging base  102  may include a processing resource (e.g., processor(s)), to execute such instructions. The charging base  102  may include the non-transitory computer-readable storage medium storing the instructions and the processing resource (not shown) to execute the instructions. In another example, the controller of the charging base  102  may be implemented by electronic circuitry. The non-transitory computer-readable storage medium and the processing resource of charging base  102 , respectively, may be similar to that of the electronic device  100 . 
     In an example implementation, the controller of the charging base  102  may switch ON or OFF the flow of current through the charging coils  108  of the charging base  102 . The controller of the charging base  102  may receive the message and accordingly disable or enable a coil from amongst the charging coils  108  of the charging base  102 . 
     In an example implementation, the electronic device  100  and the charging base  102  may communicate with each other to send and receive the messages over a wired communication link or a wireless communication link. The electronic device  100  and the charging base  102  may include interfaces (not shown) for the purpose of sending and receiving such messages. In an example implementation, the interfaces may include Bluetooth™ transmitters and receivers, Universal Serial Bus (USB) ports, and the like. 
       FIG. 2  illustrates a block diagram of an electronic device  200  and a charging base  202  for wireless charging, according to an example of the present subject matter. The electronic device  200  includes a rechargeable battery  204  and a first set of coils  206 - 1 ,  206 - 2 ,  206 - 3 , and  206 - 4 , with each coil individually coupled to the rechargeable battery  204 . The first set of coils of the electronic device  200  is collectively referred to as device coils  206 . The charging base  202  includes a second set of coils  208 - 1 ,  208 - 2 ,  208 - 3 , and  208 - 4 , collectively referred to as charging coils  208 . As shown, the device coils  206  of electronic device  200  and the charging coils  208  of the charging base  202  have the same arrangement such that when the electronic device  200  is placed on the charging base  202  the device coils  206  overlap the charging coils  208 . The arrangement of device coils  206  and charging coils  208  is not restricted to the example arrangement shown in  FIG. 2 . In an example implementation, each of the device coils  206  and charging coils  208  of 10 W. 
     The electronic device  200  includes a controller  210  similar to the controller  110  of the electronic device  100 , as described earlier. The charging base  202  also includes a controller  210  similar to the controller of the charging base  102 , as described earlier. The controllers  210  and  220  may be implemented in a number of different ways to perform various functions for the purposes of wireless charging of the electronic device  200  using the charging base  202 . 
     The electronic device  200  may include a transceiver (not shown) to perform NFC with other devices through a region  212  of the electronic device  100  in a similar manner as that for the electronic device  100 . The electronic device  200  also includes a touch-pad  214  through which a user can provide touch-based user inputs to the electronic device  200 . The electronic device  200  further includes one or more temperature sensors  216 . The temperature sensors  216  monitor, for example, in real-time, temperature of various regions in the electronic device  200 . 
     The description hereinafter describes a procedure of wireless charging of the electronic device  200  using the charging base  202 , in accordance with an example implementation. In an example implementation, information with regard to the coil of the electronic device  200  which is placed in the region of NFC  212  and the coil of the electronic device  200  which is placed under the touch-pad is stored in a memory (not shown) of the electronic device  200 . Further, information with regard to the coil of the electronic device  200  which is present in the vicinity of the rechargeable battery  204 , in the vicinity of the controller  220 , or the processing unit of the electronic device  200  is stored in the memory of the electronic device  200 . Such information may be stored at the time of assembling or configuring the electronic device  200 . The information may include an attribute of coils, for example, the coil number. 
     For the purpose of wireless charging, the electronic device  200  is placed on the charging base  202 . The controller  220  of the charging base  202  passes current through each of the charging coils  208  to induce electromagnetic current in the device coils  206 . The controller  210  of the electronic device  200  directs the induced electromagnetic current from the device coils  206  to the rechargeable battery  204  charging the rechargeable battery  204 . 
     In an example implementation, the controller  210  may determine a coil, from amongst the device coils  206 , that is present in the region of NFC  212 . The controller  210  may fetch the information stored in the electronic device  100  to determine the coil that is present in the region of NFC  212 . Upon determining the coil that is present in the region of NFC  212 , the controller  210  may send a coil-OFF message to the charging base  202  to disable a coil, from amongst the charging coils  208 , which overlaps with the determined coil. Upon receiving the coil-OFF message, the controller  220  may disable the coil of the charging base  202  as indicated by the coil-OFF message. 
     With reference to  FIG. 2 , the controller  210  determines the coil  206 - 1  to be present in the region of NFC  212 , and sends a coil-OFF message to disable the coil  208 - 1 . The controller  220  accordingly disables the coil  208 - 1 . With the coil  208 - 1  disabled, the rechargeable battery  204  is charged through the charging coils  208 - 2 ,  208 - 3 , and  208 - 4  of the charging base  202  and the device coils  206 - 2 ,  206 - 3 , and  206 - 4  the electronic device  200  without affecting the NFC that may be performed with the electronic device  200 . 
     In an example implementation, the controller  210  may determine, in real-time, whether the transceiver is active for the NFC and accordingly send a coil-OFF message or a coil-ON message for disabling or enabling a specific coil of the charging base  202  in a similar manner as described earlier with reference to  FIG. 1 . 
     Further, in an example implementation, the controller  210  may determine a coil, from amongst the device coils  206 , that is present under the touch-pad  214 . The controller  110  may fetch the information stored in the electronic device  100  to determine the coil that is present under the touch-pad  214 . Upon determining the coil that is present under the touch-pad  214 , the controller  210  may send a coil-OFF message to the charging base  202 . This coil-OFF message includes information indicative of disabling a coil, from amongst the charging coils  208 , which overlaps with the determined coil of the electronic device  200 . In an example implementation, the controller  220  of the charging base  202  may receive the coil-OFF message and accordingly disable the coil of the charging base  202  as indicated by the coil-OFF message. 
     With reference to  FIG. 2 , the controller  210  determines the coil  206 - 2  to be present under the touch-pad  214 , and sends a coil-OFF message to disable the coil  208 - 2 . The controller  220  accordingly disables the coil  208 - 2 . With the coil  208 - 2  disabled, the rechargeable battery  204  is charged through other charging coils  208 - 1 ,  208 - 3 , and  208 - 4  of the charging base  202  and other device coils  206 - 1 ,  206 - 3 , and  206 - 4  the electronic device  200  without affecting the performance of the touch-pad  214 . 
     In an example implementation, the controller  210  may determine, in real-time, whether the touch-pad  214  is active to receive touch-based user inputs. When the touch-pad  214  is determined to be active, the controller  210  sends the coil-OFF message to the charging base  202  to disable the coil of the charging base  202  which overlaps with the coil of the electronic device  200  present under the touch-pad  214 . Further, when the touch-pad  214  is determined to be inactive, the controller  210  sends a coil-ON message to the charging base, which indicates to enable the coil of charging base  202  which overlaps with the coil of the electronic device  200  present under the touch-pad  214 . In an example implementation, the controller  220  receives the coil-ON message and accordingly enables the coil of the charging base  202  as indicated by the coil-ON message. Disabling and enabling the coil of charging base  202  in real-time depending on whether the touch-pad  214  is active or inactive facilitates in efficient and effective wireless charging of the electronic device  100  without affecting the performance of the touch-pad  214 . 
     Further, in an example implementation, the controller  210  may determine a coil, from amongst the device coils  206 , that is present in a region, in the electronic device  200 , at a high temperature. The high temperature being more than a specific temperature. The controller  210  may determine the coil that is present in such a region based on the information from the temperature sensors  216 . The temperature sensor  216  may monitor temperature at various regions in the electronic device  200 . For example, regions in the vicinity of the rechargeable battery  204 , in the vicinity of the controller  220  or the processing resource of the electronic device  200 , may be monitored. The controller  220  may identify the region at high temperature, and determine the coil that is present in that region based on the information of the device coils  206  stored in the electronic device  200 . 
     Upon determining the coil that is present in the region at high temperature, the controller  210  may send a coil-OFF message to the charging base  202  to disable a coil, from amongst the charging coils  208 , which overlaps with the determined coil of the electronic device  200 . In an example implementation, the controller  220  of the charging base  202  may receive the coil-OFF message and accordingly disable the coil of the charging base  202  as indicated by the coil-OFF message. 
     With reference to  FIG. 2 , the temperature sensor  216  may identify the region in the vicinity of the rechargeable battery  204  to be at a temperature more than the specific temperature. The controller  210  may accordingly determine the coil  206 - 3  to be present in such a region, and send a coil-OFF message to disable the coil  208 - 3 . The controller  220  may disable the coil  208 - 3 . With the coil  208 - 3  disabled, the rechargeable battery  204  may be charged through other charging coils  208 - 1 ,  208 - 2 , and  208 - 4  of the charging base  202  and other device coils  206 - 1 ,  206 - 2 , and  206 - 4  the electronic device  200  without affecting overheating the rechargeable battery  204 . 
     Further, in an example implementation, the controller  210  may determine whether the temperature of the aforesaid region of high temperature is below the specific temperature. Accordingly, the controller  210  may send a coil-ON message to the charging base  202  to enable the coil of the second set which overlaps with the coil of the first set present in the region of reduced temperature. The controller  220  of the charging base  202  may receive the coil-ON message and switch ON the coil of the charging base  202  as indicated by the coil-ON message. 
     Although the above description describes disabling or switching OFF of one of the coils of the charging base during wireless charging; in an example implementation, a combination of coils of the charging base which overlap corresponding coils of the electronic device present in the region of NFC, under the touch-pad, and in the region of high temperature, may be disabled or switched OFF. 
       FIG. 3  illustrates a method  300  of wireless charging a rechargeable battery in an electronic device, according to an example of the present subject matter. The method  300  can be implemented by processor(s) or device(s) through any suitable hardware, a non-transitory machine readable medium, or a combination thereof. Further, although the method  300  is described in context of the aforementioned electronic device  200  and charging base  202 , other suitable devices or systems may be used for execution of the method  300 . In some example implementations, processes involved in the method  300  can be executed based on instructions stored in a non-transitory computer-readable medium. The non-transitory computer-readable medium may include, for example, digital memories, magnetic storage media, such as a magnetic disks and magnetic tapes, hard drives, or optically readable digital data storage media. 
     Referring to  FIG. 3 , at block  302 , electromagnetic current is generated in a first set of coils of the electronic device  200  upon electromagnetic coupling of the first set of coils with a second set of coils of the charging base  202 . For this, the electronic device  200  is placed on the charging base  202 , and the charging base  202  is switched ON. The first set of coils and the second set of coils may be arranged in the electronic device  200  and the charging base  202 , respectively, such that each coil of the first set overlaps a corresponding coil from the second set when the electronic device  200  is placed on the charging base  202 . At block  304 , the generated electromagnetic current is provided, by the controller  210  of the electronic device  200 , to the rechargeable battery  204  of the electronic device  200 . This starts charging the rechargeable battery  204 . 
     At block  306 , a coil from amongst the first set of coils that is present under a touch-pad  214  of the electronic device  200  is determined by the controller  210 . In an example implementation, the coil that is present under the touch-pad  214  is determined based on the information of device coils  206  stored in the electronic device  200 , as described earlier. Upon determining the coil that is present under the touch-pad  214 , a message is sent by the controller  210  to the charging base  202  to disable a coil of the second set which overlaps with the coil of the first set present under the touch-pad  214 , at block  308 . This message is indicative of the coil of the second set which is to disabled. As described earlier, such a message is received by the controller  220  of the charging base  202  and the coil indicated by the message is switched OFF by the controller  220 . 
     In an example implementation, whether the touch-pad  214  of the electronic device  200  is active to receive touch-based user inputs is determined by the controller  210 . A message is sent by the controller  210  to the charging base  202  to disable the coil of the second set which overlaps with the coil of the first set present under the touch-pad  214 , when the touch-pad  214  is determined to be active. The message is received by the controller  220  and accordingly the coil of the second set is switched OFF by the controller  220 . Further, when the touch-pad is determined to be inactive, a message is sent by the controller  210  to the charging base  202  to enable the coil of the second set which overlaps with the coil of the first set present under the touch-pad. Such a message is received by the controller  220  and accordingly the coil of the second set is switched ON by the controller  220 . 
       FIG. 4  illustrates a method  400  of wireless charging a rechargeable battery in an electronic device, according to an example of the present subject matter. The method  400  can be implemented by processor(s) or device(s) through any suitable hardware, a non-transitory machine readable medium, or a combination thereof. Further, although the method  400  is described in context of the aforementioned electronic device  200  and charging base  202 , other suitable devices or systems may be used for execution of the method  400 . In some example implementations, processes involved in the method  400  can be executed based on instructions stored in a non-transitory computer-readable medium. The non-transitory computer-readable medium may include, for example, digital memories, magnetic storage media, such as a magnetic disks and magnetic tapes, hard drives, or optically readable digital data storage media. 
     Referring to  FIG. 4 , at block  402 , while the electronic device  200  is placed on the charging base  202  and the generated electromagnetic current is provided, by the controller  210 , to the rechargeable battery  204 , a coil from amongst the first set of coils that is present in a region of NFC  212  of the electronic device  200  is determined by the controller  210 . In an example implementation, the coil that is present in the region of NFC  212  is determined based on the information of device coils  206  stored in the electronic device  200 , as described earlier. Upon determining the coil that is present in the region of NFC  212 , a message is sent by the controller  210  to the charging base  202  to disable a coil of the second set which overlaps with the coil of the first set present in the region of NFC  212 , at block  404 . This message is indicative of the coil of the second set which is to disabled. As described earlier, such a message is received by the controller  220  of the charging base  202  and the coil indicated by the message is switched OFF by the controller  220 . 
     In an example implementation, whether a transceiver of the electronic device  200  is active for the NFC is determined by the controller  210 . A message is sent by the controller  210  to the charging base  202  to disable the coil of the second set which overlaps with the coil of the first set present in the region of NFC  212 , when the transceiver is determined to be active. Such a message is received by the controller  220  and accordingly the coil of the second set is switched OFF by the controller  220 . Further, when the transceiver is determined to be inactive, a message is sent by the controller  210  to the charging base  202  to enable the coil of the second set which overlaps with the coil of the first set present in the region of NFC  212 . Such a message is received by the controller  220  and accordingly the coil of the second set is switched ON by the controller  220 . 
       FIG. 5  illustrates a method  500  of wireless charging a rechargeable battery in an electronic device, according to an example of the present subject matter. The method  500  can be implemented by processor(s) or device(s) through any suitable hardware, a non-transitory machine readable medium, or a combination thereof. Further, although the method  500  is described in context of the aforementioned electronic device  200  and charging base  202 , other suitable devices or systems may be used for execution of the method  500 . In some example implementations, processes involved in the method  500  can be executed based on instructions stored in a non-transitory computer-readable medium. The non-transitory computer-readable medium may include, for example, digital memories, magnetic storage media, such as a magnetic disks and magnetic tapes, hard drives, or optically readable digital data storage media. 
     Referring to  FIG. 5 , at block  502 , while the electronic device  200  is placed on the charging base  202  and the generated electromagnetic current is provided, by the controller  210 , to the rechargeable battery  204 , a coil from amongst the first set of coils that is present in a region, in the electronic device, at a temperature more than a specific temperature is determined by the controller  210 . In an example implementation, the coil that is present in the region at the temperature more than the specific temperature is determined based on the information from temperature sensors  216  in the electronic device  200  and information of device coils  206  stored in the electronic device  200 , as described earlier. Upon determining the coil that is present in the region at the temperature more than the specific temperature, a message is sent by the controller  210  to the charging base  202  to disable a coil of the second set which overlaps with the coil of the first set present in the region at the temperature more than the specific temperature, at block  504 . As described earlier, such a message is received by the controller  220  of the charging base  202  and the coil indicated by the message is switched OFF by the controller  220 . Further, in an example implementation, when the temperature of the aforesaid region of high temperature is determined to be below the specific temperature, a message is sent by the controller  210  to the charging base  202  to enable the coil of the second set which overlaps with the coil of the first set present in the region of reduced temperature. Such a message is received by the controller  220  of the charging base  202  and the coil indicated by the message is switched ON by the controller  220 . 
       FIG. 6  illustrates a system environment  600  implementing a non-transitory computer readable medium for wireless charging, according to an example of the present subject matter. The system environment  600  includes a processor  602  communicatively coupled to the non-transitory computer-readable medium  604  through a communication link  606 . In an example, the processor  602  may be a processing resource of an electronic device for fetching and executing computer-readable instructions from the non-transitory computer-readable medium  604 . The electronic device may be the electronic device  200  as described with reference to  FIG. 2 . 
     The non-transitory computer-readable medium  604  can be, for example, an internal memory device or an external memory device. In an example implementation, the communication link  606  may be a direct communication link, such as any memory read/write interface. In another example implementation, the communication link  606  may be an indirect communication link, such as a network interface. In such a case, the processor  602  can access the non-transitory computer-readable medium  604  through a communication network (not shown). 
     In an example implementation, the non-transitory computer-readable medium  604  includes a set of computer-readable instructions for wireless charging of the electronic device  200  using a charging base  202 . The set of computer-readable instructions can be accessed by the processor  602  through the communication link  606  and subsequently executed to perform acts for wireless charging of the electronic device  200  using the charging base  202 . The electronic device  200  include a first set of coils and the charging base  202  includes a second set of coils, as described earlier. The electronic device  200  is placed on the charging base  202  such that the first set of coils overlap the second set of coils. 
     Referring to  FIG. 6 , in an example, the non-transitory computer-readable medium  604  may include instructions  608  to provide, to a rechargeable battery  204  of the electronic device  200  for wireless charging, electromagnetic current induced in the first set of coils of the electronic device  200  upon coupling of the first set of coils with a second set of coils of the charging base  202 . As described earlier, each coil of the first set overlaps a corresponding coil from the second set when the electronic device  200  is placed on the charging base  202 . 
     The non-transitory computer-readable medium  604  may include instructions  610  to determine a coil from amongst the first set of coils that is present in a region, in the electronic device  200 , at a temperature more than a specific temperature. The non-transitory computer-readable medium  604  may include instructions  612  to send a message to the charging base  202  to disable a coil of the second set which overlaps with the coil of the first set present in the region at the temperature more than the specific temperature. The charging base  202  may accordingly disable the coil indicated by such a message. 
     In an example implementation, the non-transitory computer-readable medium  604  may include instructions to send a message to the charging base  202  to enable the coil of the second set once the temperature of the region in the electronic device  200  is determined to be below the specific temperature. The charging base  202  may accordingly enable the coil indicated by such a message. 
     Further, in an example implementation, the non-transitory computer-readable medium  604  may include instructions to determine a coil from amongst the first set of coils that is present under a touch-pad  214  of the electronic device  200 . The non-transitory computer-readable medium  604  may include instructions to send a message to the charging base  202  to disable a coil of the second set which overlaps with the coil of the first set present under the touch-pad  214 . The charging base  202  may accordingly disable the coil indicated by the message. 
     Further, in an example implementation, the non-transitory computer-readable medium  604  may include instructions to determine, in real-time, whether the touch-pad  214  is active to receive touch-based user inputs. The non-transitory computer-readable medium  604  may include instructions to send the message to the charging base  202  to disable the coil of the second set which overlaps with the coil of the first set present under the touch-pad  214 , when the touch-pad  214  is determined to be active. The non-transitory computer-readable medium  604  may include instructions to send a message to the charging base  202  to enable the coil of the second set which overlaps with the coil of the first set present under the touch-pad  214 , when the touch-pad  214  is determined to be inactive. 
     Further, in an example implementation, the non-transitory computer-readable medium  604  may include instructions to determine a coil from amongst the first set of coils that is present in a region of NFC  212  of the electronic device  200 . The non-transitory computer-readable medium  604  may include instructions to send a message to the charging base  202  to disable a coil of the second set which overlaps with the coil of the first set present in the region of NFC  212 . The charging base  202  may accordingly disable the coil indicated by such a message. 
     Further, in an example implementation, the non-transitory computer-readable medium  604  may include instructions to determine, in real-time, whether a NFC transceiver of the electronic device  200  is active for NFC. The non-transitory computer-readable medium  604  may include instructions to send the message to the charging base  202  to disable the coil of the second set which overlaps with the coil of the first set present in the region of NFC  212 , when the NFC transceiver is determined to be active. The non-transitory computer-readable medium  604  may include instructions to send a message to the charging base  202  to enable the coil of the second set which overlaps with the coil of the first set present in the region of NFC, when the NFC transceiver is determined to be inactive. 
     Although examples for the present disclosure have been described in language specific to structural features and/or methods, it is to be understood that the appended claims are not limited to the specific features or methods described herein. Rather, the specific features and methods are disclosed and explained as examples of the present disclosure.