Wireless power transceiver and related method thereof

Abstract

Wireless power transceiver devices and related methods are disclosed. The WPT device (102) includes an energy module (110) and a magnetic interface unit (114) including a transceiver coil (128). Further, the WPT device (102) includes a controller (116) configured to generate one of the first control signal and the second control signal based on the at least one first parameter of the energy module (110) and the at least one second parameter of the one of the plurality of external devices (104). Moreover, the WPT device (102) includes a bidirectional driver (112) configured to transmit at least one of the first AC signal and the second AC signal through the transceiver coil (128) if the first control signal is received from the controller (116), and to receive at least one of the first AC signal and the second AC signal if the second control signal is received from the controller (116).

Description

[0001] This application is a divisional application of Chinese national phase application 201880024670.3, whose international application date is March 16, 2018, international application number is PCT / US2018 / 022847, and invention name is “Wireless Power Transceiver Device and Related Methods”, all contents of which are incorporated herein by reference. Technical Field

[0002] Embodiments of the present invention relate generally to wireless power systems, and more particularly to wireless power transceiver devices and related methods. Background Art

[0003] Typically, a power transmission system is used to transfer power from a power source to one or more receiving devices, such as, for example, mobile devices, biomedical devices, portable consumer devices, etc. The power transmission system can be a contact-based power transmission system or a wireless power transmission system. In a contact-based power transmission system, interconnects are used to transfer power from a power source to a receiving device. The interconnects may be affected over a period of time. In addition, the interconnects of a contact-based power transmission system increase the overall weight of the system. Therefore, a contact-based power transmission system is generally larger and heavier than a wireless-based power transmission system.

[0004] Typically, in a wireless power transfer system, a charging device is used to convert input power received from a power source into transmittable power that is transmitted to charge one or more batteries in a receiving device. If the power source is an external power source, the charging device needs to be coupled to the power source via one or more interconnecting wires, which in turn interrupts the movement of the charging device. If the power source is an internal power source (such as a battery), the charging device provides a limited power source until the battery is exhausted. The exhausted battery needs to be replaced for further power transmission to the receiving device.

[0005] Therefore, there is a need for improved systems and methods for transmitting and receiving wireless power from an external device. Summary of the invention

[0006] According to one embodiment of the present invention, a wireless power transceiver device is disclosed. The wireless power transceiver device includes an energy module. In addition, the wireless power transceiver device includes a magnetic interface unit, which includes at least one transceiver coil. Moreover, the wireless power transceiver device includes a controller, which is coupled to the magnetic interface unit and is configured to generate one of a first control signal and a second control signal based on at least one first parameter of the energy module and at least one second parameter of one of a plurality of external devices. In addition, the wireless power transceiver device includes a bidirectional driver, which is coupled to the magnetic interface unit and the controller, and is configured to send at least one of a first AC signal having a first frequency and a second AC signal having a second frequency different from the first frequency through at least one transceiver coil if a first control signal is received from the controller, and to receive at least one of a first AC signal having a first frequency and a second AC signal having a second frequency through at least one transceiver coil if a second control signal is received from the controller.

[0007] According to another embodiment of the present invention, a method for sending and receiving power is disclosed. The method includes generating, by a controller, one of a first control signal and a second control signal based on at least one first parameter of an energy module and at least one second parameter of an external device among a plurality of external devices. Moreover, the method includes, if a first control signal is received from the controller, at least one of a first AC signal having a first frequency and a second AC signal having a second frequency different from the first frequency is sent by a bidirectional driver through at least one transceiver coil. In addition, the method includes, if a second control signal is received from the controller, at least one of a first AC signal having a first frequency and a second AC signal having a second frequency is received by a bidirectional driver through at least one transceiver coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] These and other features, aspects and advantages of the present disclosure will be better understood when the following detailed description is read with reference to the accompanying drawings, wherein like characters refer to like parts throughout, and wherein:

[0009] Figure 1 is a schematic diagram of a wireless power transmission system according to an embodiment of the present invention;

[0010] Figure 2 is a detailed schematic diagram of a wireless power transmission system according to an embodiment of the present invention; and

[0011] Figure 3 is a flowchart illustrating a method for transmitting and receiving power from an external device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0012] As will be described in detail below, various embodiments of systems and methods for transmitting and receiving wireless power are disclosed. Specifically, the systems and methods disclosed herein allow a device such as a power bank or a mobile device to wirelessly receive power from other devices or wirelessly transmit power to charge other devices independently of a wireless charging standard.

[0013] Figure 1 is a schematic diagram of a wireless power transmission system 100 according to an embodiment of the present invention. The wireless power transmission system 100 includes a wireless power transceiver device 102 and an external device 104 including a first external device 106 and a second external device 108. For ease of understanding, the first external device 106 is considered to be a power receiving device, such as a mobile device, a biomedical device, a portable consumer device, etc. Similarly, the second external device 108 is considered to be a power transmitting device, such as a mobile power bank, a charging pad, etc. The number of external devices may vary depending on the application.

[0014] The first external device 106 and the second external device 108 are compatible with one of the wireless frequency standards. In the illustrated embodiment of the present invention, the first external device 106 is considered to be compatible with a first frequency standard (e.g., the Air Fuel Alliance standard defined at a frequency of approximately 6.7 MHz). Similarly, the second external device 108 is considered to be compatible with a second frequency standard defined in a frequency range of 100 kHz to 200 kHz (such as the Qi standard). It should be noted here that the first external device 106 and the second external device 108 can be compatible with any frequency standard and are not limited to the frequency standards mentioned herein. In addition, it is contemplated that any number of external devices 104 compatible with any number of frequency standards can be used.

[0015] In conventional power transmission systems, a charging device is used to transmit power to a mobile device. However, the charging device is coupled to an external power source via one or more interconnecting wires, which in turn limits the mobility of the charging device. On the other hand, if a battery is included in the charging device to transmit power, the charging device can provide limited power until the battery is exhausted. In addition, the exhausted battery needs to be charged using an interconnecting wire to further transmit power to the mobile device.

[0016] To overcome the problems / disadvantages associated with conventional systems, the exemplary power transmission system 100 includes a wireless power transceiver device 102 configured to transmit power to a first external device 106 or receive power from a second external device 108. In one embodiment, the first external device 106 and the second external device 108 may be positioned at a predetermined distance from the wireless power transceiver device 102. For example, the predetermined distance may be in the range of approximately 5 mm to 500 mm. The wireless power transceiver device 102 is configured to transmit power to the first external device 106 or receive power at a corresponding frequency standard.

[0017] like Figure 1 As shown, the wireless power transceiver device 102 includes an energy module 110, a bidirectional driver 112, a magnetic interface unit 114, and a controller 116. The bidirectional driver 112 is electrically coupled to the energy module 110, the magnetic interface unit 114, and the controller 116. In one embodiment, the energy module 110 is configured to provide input power having a direct current (DC) signal 118 to the bidirectional driver 112. In another embodiment, the energy module 110 is configured to receive power having a DC signal 134 from the bidirectional driver 112. The energy module 110 may be a storage unit capable of transmitting and receiving power, such as a battery. In some embodiments, the power transmitted or received may be in the range of approximately 0.1 W to 3 KW.

[0018] In addition, the controller 116 is operably coupled to the energy module 110 and the first external device 106 and the second external device 108. The controller 116 is configured to receive one or more parameters from one of the first external device 106 and the second external device 108, and receive one or more parameters from the energy module 110. In response, the controller 116 is configured to generate a first control signal 120 or a second control signal 122 based on the parameters received from one of the first external device 106 and the second external device 108 and the energy module 110. In one embodiment, the parameters may include a state of charge, a voltage, a power, a frequency band type, etc. The frequency band type may be one of the frequency standards, such as the Air Fuel Alliance standard and the Qi standard.

[0019] In addition, the bidirectional driver 112 is configured to receive a first control signal 120 or a second control signal 122 from the controller 116. If the first control signal 120 is received, the bidirectional driver 112 receives input power having a DC signal 118 from the energy module 110 and converts the DC signal 118 into a first AC signal 124 having a first frequency or a second AC signal 126 having a second frequency. It can be noted that the first frequency corresponds to a first frequency standard and the second frequency corresponds to a second frequency standard. In addition, the bidirectional driver 112 transmits the first AC signal 124 having a first frequency or the second AC signal 126 having a second frequency to the first external device 106 via a transceiver coil 128 arranged in the magnetic interface unit 114. The transmitted first AC signal 124 or the second AC signal 126 is received by the receiver coil 136 for charging a load 138 (such as one or more batteries in the first external device 106). In another embodiment, if the first external device 106 is compatible with both the first frequency standard and the second frequency standard, the bidirectional driver 112 may convert the DC signal 118 into a first AC signal 124 having a first frequency and a second AC signal 126 having a second frequency. In addition, the bidirectional driver 112 may transmit the first AC signal 124 having a first frequency and the second AC signal 126 having a second frequency to the first external device 106 via the transceiver coil 128. In one example, the bidirectional driver 112 may alternately transmit the first AC signal 124 having a first frequency and the second AC signal 126 having a second frequency.

[0020] If the second control signal 122 is received, the bidirectional driver 112 receives a first AC signal 130 having a first frequency or a second AC signal 132 having a second frequency from the second external device 108 via the transceiver coil 128 within the magnetic interface unit 114. Specifically, the power supply 140 within the second external device 108 generates a DC signal, which is converted into the first AC signal 130 or the second AC signal 132, which is then transmitted to the bidirectional driver 112 via the transmitter coil 142 within the second external device 108. In addition, the bidirectional driver 112 converts the first AC signal 130 having a first frequency or the second AC signal 132 having a second frequency into a DC signal 134 for charging the energy module 110. In another embodiment, if the second external device 108 is compatible with the first frequency standard and the second frequency standard, the bidirectional driver 112 can receive the first AC signal 130 having a first frequency and the second AC signal 132 having a second frequency from the second external device 108. In addition, the bidirectional driver 112 may convert a first AC signal 130 having a first frequency and a second AC signal 132 having a second frequency into a DC signal 134 for charging the energy module 110. Figure 2 Aspects of sending and receiving power are explained in more detail.

[0021] Therefore, by adopting the exemplary wireless power transceiver device 102, power can be wirelessly transmitted to the first external device 106 to charge the battery in the first external device 106. Moreover, the wireless power transceiver device 102 can wirelessly receive power from the second external device 108 to charge the energy module 110 in the wireless power transceiver device 102. In addition, the exemplary wireless power transceiver device 102 can be a mobile charger that can transmit power to the first external device 106 or receive power from the second external device 108 without any interconnecting wires.

[0022] Reference Figure 2 , shows a schematic representation of a wireless power transmission system 100 according to an embodiment of the present invention. The wireless power transmission system 100 includes a wireless power transceiver device 102, a first external device 106, and a second external device 108. The wireless power transceiver device 102 is magnetically coupled to the first external device 106 and the second external device 108.

[0023] In addition, the wireless power transceiver device 102 includes an energy module 110, a bidirectional driver 112, a magnetic interface unit 114, a controller 116, and an antenna 202. The energy module 110 may be a DC power source electrically coupled to a first end 204 of the bidirectional driver 112. In one embodiment, the energy module 110 is configured to provide input power having a DC signal to the first end 204 of the bidirectional driver 112. The DC signal may represent a DC voltage of the input power from the energy module 110. In another embodiment, the energy module 110 is configured to receive power having a DC signal from the first end 204 of the bidirectional driver 112. In addition, the magnetic interface unit 114 includes a transceiver coil 128 and capacitors 206, 208 electrically coupled to a second end 210 of the bidirectional driver 112.

[0024] In addition, the bidirectional driver 112 includes a switch 214 of a first branch 212, a switch 218 of a second branch 216, which are connected to form a bridge circuit between the first end 204 and the second end 210. In addition, the bidirectional driver 112 includes a switch 222 of a third branch 220, and the switch 222 of the third branch 220 is connected in parallel with the switch 214 of the first branch 212 and the switch 218 of the second branch 216. The switch 222 of the third branch 220 is used to place the transceiver coil 128 at a desired or predetermined position to change the number of turns of the transceiver coil 128. More specifically, if the switch 222 of the third branch 220 is activated together with the switch 214 of the first branch 212, the first number of turns 224 of the transceiver coil 128 is activated. In one embodiment, the first number of turns 224 of the transceiver coil 128 is activated to transmit power to the first external device 106. Similarly, if the switch 222 of the third branch 220 is activated together with the switch 218 of the second branch 216, the second turn 226 of the transceiver coil 128 is activated. In one embodiment, the second turn 226 of the transceiver coil 128 is activated to receive power from the second external device 108.

[0025] During operation, the controller 116 receives one or more parameters (also referred to as first parameters) from the energy module 110. The one or more first parameters may include a charging state (also referred to as a first charging state) of the energy module 110, the power of the energy module 110, the voltage of the energy module 110, and a frequency band type of the wireless power transceiver device 102. In one embodiment, the charging state may be determined based on the power or voltage of the energy module 110. It may be noted that the charging state indicates a percentage of charge in the energy module 110. In another embodiment, the frequency band type may be one of the frequency standards discussed herein.

[0026] In addition, the controller 116 receives one or more parameters (also referred to as second parameters) from the first external device 106 or the second external device 108. The controller 116 is coupled to the antenna 202, which is wirelessly coupled to the first external device 106 and the second external device 108 to receive the one or more second parameters. In one embodiment, a short-range communication such as Bluetooth communication can be established between the controller 116 and the first external device 106 and the second external device 108 for transmitting the first parameter and the second parameter. The one or more second parameters may include a charging state (also referred to as a second charging state) of the first external device 106 and the second external device 108, power of the first external device 106 and the second external device 108, voltage of the first external device 106 and the second external device 108, and a frequency band type of the first external device 106 and the second external device 108.

[0027] In addition, the controller 116 is configured to generate a first control signal 120 or a second control signal 122 based on one or more first parameters received from the energy module 110 and one or more second parameters of the external device 104. In one embodiment, if the controller 116 receives one or more second parameters from the first external device 106, the controller 116 determines the charging state of the first external device 106. In addition, the controller 116 compares the charging state of the first external device 106 with the charging state of the energy module 110. If the charging state of the first external device 106 is less than the charging state of the energy module 110, the controller 116 generates a first control signal 120. The generated first control signal 120 is sent to the bidirectional driver 112 to activate the switch 214 of the first branch 212 and the switch 222 of the third branch 220 in the bidirectional driver 112. As a result, the first turns 224 of the transceiver coil 128 are activated or turned on to transmit the input power to the first external device 106. More specifically, in addition to the first control signal 120, the controller 116 sends one or more frequency control signals to the switch 214 of the first branch 212 and the switch 222 of the third branch 220 to convert the DC signal into a first AC signal 124 having a first frequency or a second AC signal 126 having a second frequency. In one embodiment, the frequency control signal can be a pulse modulation signal with a predetermined duty cycle. The converted first AC signal 124 or the second AC signal 126 is sent to the first external device 106 via the first turns 224 of the transceiver coil 128.

[0028] In addition, a first AC signal 124 having a first frequency or a second AC signal 126 having a second frequency is transmitted to the first external device 106 until the charge in the first external device 106 is greater than the threshold charge value. Specifically, the first external device 106 continuously or periodically transmits one or more second parameters indicating the charging state of the first external device 106 to the controller 116 in the wireless power transceiver device 102. In addition, if the charge in the first external device 106 is greater than the threshold charge value, the controller 116 drives the bidirectional driver 112 to stop transmitting the first AC signal 124 or the second AC signal 126 to the first external device 106. In one embodiment, the controller 116 sends a control signal to disconnect the switch 214 of the first branch 212 and the switch 222 of the third branch 220. In another embodiment, if the first external device 106 is compatible with both the first frequency standard and the second frequency standard, the bidirectional driver 112 may convert the DC signal 118 into a first AC signal 124 having a first frequency and a second AC signal 126 having a second frequency. In addition, the bidirectional driver 112 can transmit a first AC signal 124 having a first frequency and a second AC signal 126 having a second frequency to the first external device 106 via the transceiver coil 128. In one example, the bidirectional driver 112 can alternately transmit the first AC signal 124 having the first frequency and the second AC signal 126 having the second frequency.

[0029] In another embodiment, if the controller 116 receives one or more second parameters from the second external device 108, the controller 116 determines the charging state of the second external device 108 based on the one or more second parameters received from the second external device 108. In addition, the controller 116 compares the charging state of the second external device 108 with the charging state of the energy module 110. If the charging state of the second external device 108 is greater than the charging state of the energy module 110, the controller 116 generates a second control signal 122. In addition, the generated second control signal 122 is sent to the bidirectional driver 112 to activate the switch 218 of the second branch 216 and the switch 222 of the third branch 220 in the bidirectional driver 112. As a result, the second turn 226 of the transceiver coil 128 is activated or turned on to receive the first AC signal 130 having the first frequency or the second AC signal 132 having the second frequency from the second external device 108. In addition, the controller 116 can send one or more frequency control signals to the switch 218 of the second branch 216 and the switch 222 of the third branch 220 to convert the first AC signal 130 or the second AC signal 132 into a corresponding DC signal for charging the energy module 110 in the wireless power transceiver device 102.

[0030] In addition, the first AC signal 130 or the second AC signal 132 is received from the second external device 108 until the charge in the energy module 110 of the wireless power transceiver device 102 is greater than the threshold charge value. Specifically, the controller 116 continuously or periodically transmits one or more first parameters indicating the charging state in the energy module 110 to the second external device 108. In addition, if the charge in the energy module 110 of the wireless power transceiver device 102 is greater than the threshold charge value, the second external device 108 stops transmitting the first AC signal 130 or the second AC signal 132 to the wireless power transceiver device 102. In another embodiment, if the second external device 108 is compatible with both the first frequency standard and the second frequency standard, the bidirectional driver 112 may receive the first AC signal 130 having a first frequency and the second AC signal 132 having a second frequency from the second external device 108. In addition, the bidirectional driver 112 may convert the first AC signal 130 having a first frequency and the second AC signal 132 having a second frequency into a DC signal 134 for charging the energy module 110.

[0031] Reference Figure 3 , depicts a method 300 for sending and receiving power from an external device according to an embodiment of the present invention. For ease of understanding, refer to Figures 2 to 3 The method 300 is described in an embodiment of the present invention. In step 302, a controller of the wireless power transceiver device generates one of a first control signal and a second control signal. Specifically, the controller receives at least one parameter from the energy module and at least one parameter from the external device. In addition, the controller generates the first control signal or the second control signal based on at least one parameter of the energy module and the external device.

[0032] Subsequently, in step 304, if a first control signal is received from the controller, at least one of a first AC signal having a first frequency and a second AC signal having a second frequency different from the first frequency is transmitted through at least one transceiver coil. The bidirectional driver is configured to receive the first control signal from the controller. In addition, in response to receiving the first control signal, the switch of the first branch and the switch of the third branch are activated to turn on the first number of turns of the transceiver coil. In addition, the switch of the first branch and the switch of the third branch receive one or more frequency control signals from the controller to convert the DC signal received from the energy module into at least one of a first AC signal having a first frequency and a second AC signal having a second frequency. Thereafter, at least one of the first AC signal having the first frequency and the second AC signal having the second frequency is transmitted to an external device to charge one or more loads (e.g., a battery in an external device).

[0033] In addition, in step 306, if a second control signal is received from the controller, at least one of a first AC signal having a first frequency and a second AC signal having a second frequency is received through at least one transceiver coil. The bidirectional driver is configured to receive the second control signal from the controller. In addition, in response to receiving the second control signal, the switch of the second branch and the switch of the third branch are activated to turn on the second number of turns of the transceiver coil. In addition, the switch of the second branch and the switch of the third branch receive one or more frequency control signals from the controller to convert at least one of the first AC signal having a first frequency and the second AC signal having a second frequency received from the transceiver coil into a DC signal. Thereafter, the converted DC signal is used to charge the energy module of the wireless power transceiver device.

[0034] According to the exemplary embodiments discussed herein, exemplary systems and methods facilitate sending and receiving power from external devices. In particular, the systems and methods disclosed herein allow devices such as power banks or mobile devices to receive power from other external devices or wirelessly transmit power to charge other external devices independently of wireless charging standards.

[0035] Although only certain features of the disclosure have been shown and described herein, many modifications and changes will occur to those skilled in the art. It is therefore to be understood that the appended claims are intended to cover all such modifications and changes as fall within the true spirit of the disclosure.

Claims

1. A wireless power transceiver device (102), comprising: Energy module (110); A magnetic interface unit (114) comprising at least one transceiver coil (128); a controller (116) coupled to the magnetic interface unit (114) and configured to generate one of a first control signal and a second control signal based on at least one first parameter of the energy module (110) and at least one second parameter of one of a plurality of external devices (104); A bidirectional driver (112) is coupled to the energy module, the magnetic interface unit (114) and the controller (116), and is configured to: If the first control signal is received from the controller (116), at least one of a first AC signal having a first frequency converted from a DC signal provided by the energy module and a second AC signal having a second frequency different from the first frequency is transmitted through the at least one transceiver coil (128); as well as If the second control signal is received from the controller (116), at least one of the first AC signal having the first frequency and the second AC signal having the second frequency is received through the at least one transceiver coil (128), and the received AC signal is converted into a DC signal and then sent to the energy module. The at least one second parameter includes a second charging state of one of the external devices (104), power of one of the external devices (104), voltage of one of the external devices (104), and a frequency band type of one of the external devices (104).

2. The wireless power transceiver device (102) of claim 1, wherein: The energy module (110) is coupled to the controller (116) and the bidirectional driver (112), and the energy module is configured to: If the controller (116) sends the first control signal to the bidirectional driver (112), a DC signal is sent to the bidirectional driver (112); and If the controller (116) sends the second control signal to the bidirectional driver (112), the DC signal is received from the bidirectional driver (112).

3. The wireless power transceiver device (102) of claim 2, wherein: The controller (116) is configured to: Receiving the at least one first parameter of the energy module (110); receiving the at least one second parameter of one of the external devices (104); as well as One of the first control signal and the second control signal is generated based on the at least one first parameter and the at least one second parameter.

4. The wireless power transceiver device (102) of claim 3, wherein: The bidirectional driver (112) includes a bridge circuit including a switch (214) of a first branch (212) and a switch (218) of a second branch (216).

5. The wireless power transceiver device (102) of claim 4, wherein: The bridge circuit comprises a switch of a third branch (220), wherein the switch (222) of the third branch (220) is connected in parallel with the switch (214) of the first branch (212) and the switch (218) of the second branch (216), wherein the switch (222) of the third branch (220) is configured to tap the at least one transceiver coil (128) at a predetermined position to change the number of turns of the at least one transceiver coil (128).

6. The wireless power transceiver device (102) of claim 5, wherein: The bidirectional driver (112) is configured to: If the first control signal is received from the controller (116), the switch (214) of the first branch (212) and the switch (222) of the third branch (220) are controlled to drive a first number of turns of the at least one transceiver coil (128) to transmit at least one of the first AC signal and the second AC signal to one of the external devices (104).

7. The wireless power transceiver device (102) of claim 6, wherein: The bidirectional driver (112) is configured to: If the second control signal is received from the controller (116), the switch (218) of the second branch (216) and the switch (222) of the third branch (220) are controlled to drive a second number of turns of the at least one transceiver coil (128) to receive at least one of the first AC signal and the second AC signal from one of the external devices (104), wherein the second number of turns is greater than the first number of turns.

8. The wireless power transceiver device (102) of claim 7, wherein: The bidirectional driver (112) is configured to: If the first control signal is received from the controller (116), receiving a DC signal representing a DC voltage of input power from the energy module (110); converting the DC signal into at least one of the first AC signal having the first frequency and the second AC signal having the second frequency; as well as At least one of a first AC signal having the first frequency and a second AC signal having the second frequency is transmitted to one of the external devices (104) through the at least one transceiver coil (128).

9. The wireless power transceiver device (102) of claim 7, wherein: The bidirectional driver (112) is configured to: receiving one of the first AC signal having the first frequency and the second AC signal having the second frequency from one of the external devices (104) through the at least one transceiver coil (128) if the second control signal is received from the controller (116); converting one of the first AC signal and the second AC signal into a DC signal; as well as The energy module (110) is charged using the converted DC signal.

10. The wireless power transceiver device (102) of claim 7, wherein: The at least one transceiver coil (128) is magnetically coupled to at least one coil of one of the external devices (104).

11. The wireless power transceiver device (102) of claim 1, wherein: The at least one first parameter includes a first charging state of the energy module (110), power of the energy module (110), a voltage of the energy module (110), and a frequency band type of the wireless power transceiver device (102).

12. A wireless power transceiving method, comprising: generating, by a controller (116), one of a first control signal and a second control signal based on at least one first parameter of the energy module (110) and at least one second parameter of an external device among a plurality of external devices (104); If the first control signal is received from the controller (116), at least one of a first AC signal having a first frequency converted from a DC signal provided by the energy module and a second AC signal having a second frequency different from the first frequency is transmitted by the bidirectional driver (112) through at least one transceiver coil (128); as well as If the second control signal is received from the controller (116), the bidirectional driver (112) receives at least one of the first AC signal having the first frequency and the second AC signal having the second frequency through the at least one transceiver coil (128), converts the received AC signal into a DC signal, and transmits the converted signal to the energy module. The at least one second parameter includes a second charging state of one of the external devices (104), power of one of the external devices (104), voltage of one of the external devices (104), and a frequency band type of one of the external devices (104).

13. The method according to claim 12, wherein: The bidirectional driver (112) comprises a bridge circuit, wherein the bridge circuit comprises a switch (214) of a first branch (212), a switch (218) of a second branch (216), and a switch (222) of a third branch (220).

14. The method according to claim 13, further comprising: If the first control signal is received from the controller (116), the switch (214) of the first branch (212) and the switch (222) of the third branch (220) of the bidirectional driver (112) are controlled to drive a first number of turns of the at least one transceiver coil (128) to transmit at least one of the first AC signal and the second AC signal to one of the external devices (104).

15. The method of claim 13, further comprising controlling a switch (218) of the second branch (216) and a switch (222) of the third branch (220) of the bidirectional driver (112) to drive a second number of turns of the at least one transceiver coil (128) to receive at least one of the first AC signal and the second AC signal from one of the external devices (104) if the second control signal is received from the controller (116), wherein The second number of turns is greater than the first number of turns.

16. The method according to claim 13, further comprising: If the first control signal is received from the controller (116), the bidirectional driver (112) receives a DC signal representing a DC voltage of input power from the energy module (110); converting the DC signal into at least one of the first AC signal having the first frequency and the second AC signal having the second frequency; as well as At least one of the first AC signal having the first frequency and the second AC signal having the second frequency is transmitted to one of the external devices (104) through the at least one transceiver coil (128).

17. The method according to claim 15, further comprising: If the second control signal is received from the controller interface (116), the bidirectional driver (112) receives at least one of the first AC signal having the first frequency and the second AC signal having the second frequency from one of the external devices (104) through the at least one transceiver coil (128); converting at least one of the first AC signal and the second AC signal into the DC signal; as well as The energy module (110) is charged using the converted DC signal.

18. The method of claim 12, further comprising generating the first control signal if the at least one second parameter indicating a second charging state of one of the external devices (104) is less than the at least one first parameter indicating a first charging state of the energy module (110).

19. The method of claim 18, further comprising generating the second control signal if the at least one second parameter indicating the second charging state of one of the external devices (104) is greater than the at least one first parameter indicating the first charging state of the energy module (110).

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