Abstract:
A wireless power supply system for providing a wireless power adapted for multi remote devices. The wireless power supply system comprises a plurality of primary coils, a wireless communication receiver, and a controller. The wireless communication receiver is used for receiving power requirement information. The controller is used for selecting one of the primary coils to transmit the wireless power in accordance with its internal program. When a specific remote device of the remote devices is disposed to the position of the coils and the specific remote device sends a power identification signal, the wireless communication devices receives the power identification signal, and performs a decode procedure to obtain a decoded power identification signal, and the controller selects a specific primary coil of the primary coils to output a corresponding wireless power to the specific remote device in accordance with the decoded power identification signal.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates to a wireless power supply system; in particular, to a wireless power supply system having a plurality of primary coils, and selecting according to the load state for supporting multi remote devices. 
         [0003]    2. Description of Related Art 
         [0004]    With lightweight and thin electronic device, users have been getting used to carry these electronic devices. General common electronic devices such as mobile phones, PDA (Personal Digital Assistance), notebook computers, tablet PCs, digital cameras and digital camcorders, etc., has been generally widely used for the community to become an integral part of modern information life. 
         [0005]    The concept of providing wireless power supply system using the principle of electromagnetic induction in order to reduce wiring trouble of charging, in a multi-year before have been proposed. Due to the limitation of previous induction technology, wireless charging system is subject to restrictions. For example, in order to provide a reasonably efficient operation, the wireless charging system of the prior art need to close and accurate alignment between the primary coil and the second coil. Further, between the power supply device and remote devices requiring a high coordinated tuning. Different remote devices may require different amounts of power supply, these problems are more complicated. 
         [0006]    Kuennen et al, U.S. Pat. No. 6,825,620, title of the invention for “Inductively Coupled Ballast Circuit”, Nov. 30, 2004, to be issued, discloses an inductive current supply system, with the ability to adjust its operation in response to a variety of load operation parameters. And incorporated herein by reference. U.S. patent application Ser. No. 11/965,085, the title of the invention “Inductive Power Supply with Device Identification” mentioned in the Dec. 27, 2007, reveals an inductive power supply system, which has identified the remote devices and their operation parameter. 
         [0007]    Although the above technique has been significant improvements for related systems, but in certain applications, there is still a demand for greater flexibility. In particular, the application of wireless charging, limited to one-to-one applications. In other words, a mobile device must correspond to a specific wireless charging device. When the product is not the same, wireless charging device is not compatible. Therefore, the applicant proposed a wireless power supply system for supporting devices compatible with a plurality of product. 
       SUMMARY OF THE INVENTION 
       [0008]    The object of the present invention that provides a wireless power supply system for supporting multi remote devices. This wireless power supply system for supporting multi remote devices through the built-in multiple primary coils, further through wireless communication, to identify external products and electricity demand and switch the primary coil, achieving the purpose of a wireless power supply system for supporting multi remote devices is compatible with a plurality of product. 
         [0009]    In order to achieve the aforementioned objects, according to an embodiment of the present invention, a wireless power supply system for supporting multi remote devices is proposed. This system is used to provide wireless power supply, and compatible with a plurality of remote devices. The wireless power supply system comprising a plurality of primary coils, a wireless communication receiver, and a controller. Each of the primary coils is able to wirelessly transmit the wireless electrical power to the remote devices. And the numbers of windings of the primary coils are different from each other. The wireless communication receiver is used for receiving power requirement information. The controller coupled to the wireless communication receiver and the primary coils. The controller is used for selecting at least one of the primary coils to transmit the wireless power in accordance with its internal program. When a specific remote device of the remote devices is disposed to the position of the coils and the specific remote device sends a power identification signal. The wireless communication devices receives the power identification signal, and performs a decode procedure to obtain a decoded power identification signal. And the controller selects a specific primary coil of the primary coils to output a corresponding wireless power to the specific remote device in accordance with the decoded power identification signal. 
         [0010]    The spirit of the present invention through the built-in multiple primaries coils, and through wireless communications to identify external products and the demand for electricity that is used to switch the primary coils. When the external product through the wireless transmission, power requirements of the wireless power supply system for supporting multi remote devices of the present invention is proposed. The system will determine its power requirement, switching the appropriate primary coil, and charge corresponding to the electromagnetic field of the primary coil supply for the external product demand. When power requirements change, the external product is through wireless transmission of wireless power supply system for supporting multi remote devices of the present invention to propose a different power requirement. The wireless power supply system for supporting multi remote devices of the present invention according to the power requirement of the remote devices, switch the used primary coil, and an electromagnetic field corresponding to the power supply of this primary coil for charging the external product. 
         [0011]    In order to further the understanding regarding the present invention, the following embodiments are provided along with illustrations to facilitate the disclosure of the present invention. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0012]      FIG. 1  shows a circuit diagram of a wireless power supply system for supporting multi remote devices according to a first embodiment of the present invention; 
           [0013]      FIG. 2  shows a primary side circuit diagram of a wireless power supply system for supporting multi remote devices according to a second embodiment of the present invention; 
           [0014]      FIG. 3  shows a secondary side circuit diagram of a wireless power supply system for supporting multi remote devices according to a third embodiment of the present invention; 
           [0015]      FIG. 4  shows a gain information curve varying with frequency diagram of a wireless power supply system for supporting multi remote devices according to a fourth embodiment of the present invention; 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0016]    The aforementioned illustrations and following detailed descriptions are exemplary for the purpose of further explaining the scope of the present invention. Other objectives and advantages related to the present invention will be illustrated in the subsequent descriptions and appended drawings. 
         [0017]      FIG. 1  shows a circuit diagram of a wireless power supply system for supporting multi remote devices according to a first embodiment of the present invention. This wireless power supply system for supporting multi remote devices comprising a controller  101 , a wireless communication receiver  102 , the first primary coil  103 , the second primary coil  104 , the third primary coil  105 , and the remote device  106 . The remote device  106  having a coil of primary side and a coil of secondary side. Magnetic field inductive charging circuit is using a coil. The electric field induction is using a additional lithographic.  FIG. 1  is not showed as above-mentioned, but it does not mean that the present invention can not use the electric field induction to output wireless power. 
         [0018]    Generally, the first primary coil  103 , the second primary coil  104  and the third primary coil  105  may respectively correspond to the example as three kind of remote device  106  which is supported. Assumptions, the first remote device  106  has a first voltage demand, the second remote device  106  has a second voltage demand, and the third remote device  106  has a third voltage demand. Assuming to place remote device  106  is the second remote device. The second remote device through its internal wireless transmitter emits a power identification signal which having its machine model and its voltage requirements. Wireless communication receiver  102  will decode this power identification signal. Machine model and its second voltage demand will decoded into a data that controller  101  can recognize. In this way, the controller  101  can be based on this data, the selected second primary coil  104 , and outputting the electromagnetic field to the second remote device  106  starts the charging behavior of the magnetic field induction. 
         [0019]    In addition, the wireless communication receiver  102  can also serve as a feedback mechanism. Example to charge the battery. When the battery is low-power, it needs constant current charging and constant voltage charging when the battery is high-power. Through the second remote device  106  emits a load state, an embodiment of the present invention, the controller  101  of the example will have to appropriately adjust the internal power output. For example as the duty cycle of the pulse width modulation. Further, the above-described circumstances also can be appropriately adjusting primary coils. For example, the first primary coil  103  is a low-power coil, the second primary coil  104  is a medium-power coil, and the third primary coil  105  is a high-power coil. When the power demand is low, the controller  101  of the embodiment of the present invention may also switch the second primary coil  104  to the first primary coil  103  in order to output a power corresponding to the increased power efficiency. 
         [0020]      FIG. 2  shows a primary side circuit diagram of a wireless power supply system for supporting multi remote devices according to a second embodiment of the present invention.  FIG. 2  only illustrating the primary side of the circuit diagram. The wireless power supply system for supporting multi remote devices which comprising an input voltage and current detector  201 , a power supply controller  202 , a power switch  203 , a multiplexer  204 , a wireless communication receiver  205 , a output voltage and current detector  206 , the first primary coil  207 , the second primary coil  208  and the third primary coil  209 . Further, the wireless power supply system additional illustrates the remote device  210  of secondary side. 
         [0021]    Comparing  FIG. 2  with  FIG. 1 , that can know the controller  101  is achieved by the input voltage and current detector  201 , the power supply controller  202 , the power switch  203 , the multiplexer  204 , and output voltage and current detector  206 . Input voltage and current detector  201  is used for detecting the appropriateness of the input voltage and current. After recognizing, starting the power supply controller  202 . The power supply controller  202  is above-mentioned peripheral circuit  201 ,  203 ,  204 ,  205 ,  206  control core. Assuming that the remote device  210  have not been configured to the specified position, the power supply controller  202  will make the several peripheral circuits  201 ,  203 ,  204 ,  205 ,  206  operating in the power saving mode. 
         [0022]    When the remote device  210  is configured to the specified location, the wireless communication receiver  205  as in the first embodiment described manner to inform the power supply controller  202 . The power supply controller  202  control the multiplexer  204  to choose one from the first primary coil  207 , the second primary coil  208 , and the third primary coil  209 . Also assuming the primary coil which correspond to remote device  210  is the second primary coil  208 . The multiplexer  204  is turned on the circuit between the power switch  203  and the second primary coil  208 . Power supply controller  202  based on wireless communication receiver  205  for receiving the power demand control the duty cycle of the pulse width modulation signal of the power switch  203 . And if there is necessary, the power supply controller  202  controls the multiplexer  204  to select another primary coil. 
         [0023]      FIG. 3  shows a secondary side circuit diagram of a wireless power supply system for supporting multi remote devices according to a third embodiment of the present invention. Secondary side is called the remote device  210  circuit. Without accident, the architecture of each of the remote devices is substantially equivalent to this circuit of  FIG. 3 . The circuit of the secondary side comprises a secondary side coil  301 , a rectifier circuit  302 , an output parameter sensor  303 , a power switch  304 , and a wireless communication transmitter  305 , and a power supply control circuit  306 . If the remote device  210  is a device receiving the AC power, the rectifier circuit  302  is not necessary and can be ignored whose persons are known in the art. 
         [0024]    Initially, the wireless communication transmitter  305  will send the model and information of voltage and current demand of remote device  210  to the primary side circuit. When the circuit of the primary side starts to operate, the secondary side coil  301  will start receiving the magnetic field, and this magnetic field is converted into the power supply, through the rectifier circuit  302  after rectification, and outputs a DC to output parameter sensor  303 . Output parameter sensor  303  senses the power supply parameters after rectification, such as voltage, current or frequency, etc. The power supply parameters rectified by wireless communication transmitter  305  execute a wireless coding to obtain a power identification signal, transmit to wireless communication receiver of the primary side, execute a feedback control. Power supply control circuit  306  is based on the above mentioned power supply parameters, to control the power switch to supply battery power. 
         [0025]      FIG. 4  shows a gain information curve varying with frequency diagram of a wireless power supply system for supporting multi remote devices according to a fourth embodiment of the present invention. Please also refer to  FIG. 2  and  FIG. 4 , due to each coil have a gain information record varying with frequency, the gain information record varying with frequency is very important, and in order to maintain the stability of the power supply control. The gain information record varying with frequency  401  is assumed to correspond to the first primary coil  207 , the gain information record varying with frequency  402  corresponds to the second primary coil  208 , and the gain information record varying with frequency  403  corresponds to the third primary coil  209 . The output voltage and the input voltage has the following relationship: 
         [0000]      VO= V IN×AV×( MS/MP )× D  
 
         [0026]    VO represents the output voltage, VIN represents the input voltage, AV represents the gain of the vertical axis of  FIG. 4  described above, (MS/MP) represents the ratio of the number of coil of primary and secondary side, D represents the duty cycle.  FIG. 4  shows the relationship between the gain AV and frequency. The gain information record varying with frequency  401 ˜ 403  respectively correspond to the coil current and voltage corresponding to the gain information record varying with frequency. Generally, in order to maintain the control stability and avoiding the generation of the zero, selecting the control frequency is in the right half portion of the gain peak. The output voltage and current detector  206  is used to detect the output voltage and current. The power supply controller  202  store the data of the gain information record varying with frequency. When the output voltage and current detector  206  detects the output voltage and current, back to the power supply controller  202 . Power supply controller  202  will select one of the curves based on the voltage and current and the frequency of the pulse width modulation signal set at a stable frequency which increases the control stability of the wireless power supply system for supporting multi remote devices. 
         [0027]    Sum upon, the spirit of the present invention through the built-in multiple primary coil and wireless communication to identify external products and the electricity demand for switching the primary coil. When the external product through the wireless transmission to propose a power requirement, the wireless power supply system for supporting multi remote devices of the present invention will determine its power requirement, switching the appropriate primary coil, and supply the electromagnetic field corresponding to this primary coil for the external product demand. When power requirements change, the external product through wireless transmission to propose different power requirement to the wireless power supply system for supporting multi remote devices of the present invention. The wireless power supply system for supporting multi remote devices of the present invention according to the power requirement change the primary coil, and an electromagnetic field corresponding to the primary coil for charging the external products. 
         [0028]    The descriptions illustrated supra set forth simply the preferred embodiments of the present invention; however, the characteristics of the present invention are by no means restricted thereto. All changes, alternations, or modifications conveniently considered by those skilled in the art are deemed to be encompassed within the scope of the present invention delineated by the following claims.