Electronic device for impedance matching and method for operating same

Abstract

An electronic device for impedance matching and a method of operating the same are provided. The electronic device includes: a matching circuit having different matching impedance values according to connection states of a plurality of switches, and configured to output a matched power signal by impedance matching an input power signal; a power conversion circuit configured to convert the matched power signal into an output power signal; and a controller configured to set a matching impedance value of the matching circuit by transmitting a switching signal for adjusting a connection state of the plurality of switches to the plurality of switches, in which the controller is further configured to: receive the output power signal from the power conversion circuit while changing the matching impedance value; selecting an optimal matching impedance value based on the received plurality of output power signals; and setting the optimal matching impedance value as the matching impedance value.

Description

Technical Field

[0001] The inventive concept relates to an electronic device for impedance matching and an operating method thereof. Technical Background

[0002] Wireless power transfer is a technology that transfers power without a physical electrical connection from a power source to an electronic device, and can be used to charge electronic devices such as smartphones.

[0003] Providing power to devices without physical electrical connections using wireless power transfer may involve power consumption caused by variations in the transmitting and receiving sides of the devices, transmission distance, and other factors. It is desirable to provide maximum power to the load with minimal losses to achieve high efficiency. Impedance variation and impedance matching can play a role in achieving high efficiency in radio frequency (RF) transmission in various frequency bands.

[0004] In this regard, the amount of power received by the electronic device may vary greatly due to various reasons. Therefore, in order for the electronic device to efficiently process power, a method of performing impedance matching more accurately is of interest. Summary of the invention

[0005] The inventive concept provides an electronic device capable of efficiently receiving power.

[0006] According to one aspect of the present invention, there is provided an electronic device comprising: a matching circuit, the matching circuit comprising a plurality of capacitors and a plurality of switches, having different matching impedance values ​​according to the connection states of the plurality of switches, and configured to output a matching power signal by impedance matching an input power signal; a power conversion circuit, the power conversion circuit being configured to convert the matching power signal in an alternating current (AC) form into an output power signal in a direct current (DC) form; and a controller, the controller being configured to set the matching impedance value of the matching circuit by sending a switching signal to the plurality of switches, wherein the switching signal sets the connection states of the plurality of switches, and wherein the controller is further configured to: select an optimal matching impedance value based on a plurality of output power signals received from the power conversion circuit; and set the optimal matching impedance value to the matching impedance value.

[0007] According to another aspect of the present invention, an electronic device is provided, comprising: a matching circuit, the matching circuit comprising a plurality of capacitors and a plurality of switches, having different matching impedance values ​​according to the connection states of the plurality of switches, and configured to output a matching power signal by impedance matching an input power signal; a power conversion circuit, the power conversion circuit being configured to convert the matching power signal in AC form into an output power signal in DC form; and a controller, the controller being configured to set the matching impedance value of the matching circuit by sending a switch signal for adjusting the connection states of the plurality of switches to the plurality of switches, wherein the controller is further configured to: set the matching impedance value to a first impedance value, and receive a first output power signal from the power conversion circuit; set the matching impedance value to a second impedance value that is a first adjustment value greater than the first impedance value, and receive a second output power signal from the power conversion circuit; select an optimal matching impedance value based on a comparison result of a voltage value of the first output power signal and a voltage value of the second output power signal, and set the optimal matching impedance value to the matching impedance value.

[0008] According to another aspect of the present invention, there is provided an operating method of an electronic device, the electronic device comprising a matching circuit, a power conversion circuit and a controller; the matching circuit comprising a plurality of capacitors and a plurality of switches, having different matching impedance values ​​according to the connection states of the plurality of switches, and being configured to output a matching power signal by impedance matching an input power signal; the power conversion circuit being configured to convert an AC-form matching power signal into an output power signal in a DC-form, and the controller being configured to set the matching impedance value of the matching circuit by sending a switch signal to the plurality of switches to change the connection states of the plurality of switches, the operating method comprising: receiving the output power signal from the power conversion circuit; selecting an optimal matching impedance value based on the received plurality of output power signals; and setting the optimal matching impedance value as the matching impedance value. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The embodiments will be more clearly understood through the following detailed description taken in conjunction with the accompanying drawings, in which:

[0010] Figure 1 is a block diagram showing an electronic device according to an embodiment;

[0011] Figure 2 is a circuit diagram showing an example of an external matching circuit of an electronic device according to an embodiment;

[0012] Figure 3 is a circuit diagram showing an example of a matching circuit of an electronic device according to an embodiment;

[0013] Figure 4 is a circuit diagram showing connection of a switch when a matching impedance value of a matching circuit of an electronic device is 1C according to an embodiment;

[0014] Figure 5 is a circuit diagram showing connection of a switch when a matching impedance value of a matching circuit of an electronic device is 4C according to an embodiment;

[0015] Figure 6 is a circuit diagram showing connection of a switch when a matching impedance value of a matching circuit of an electronic device is 1.5C according to an embodiment;

[0016] Figure 7 is a table showing a relationship between a matching impedance value of a matching circuit of an electronic device according to an embodiment and a connection state of a switch;

[0017] Figure 8 is a flow chart showing an operation method of an electronic device according to an embodiment;

[0018] Fig. 9 is shown in more detail Figure 8 Flow chart of operation S810;

[0019] Fig.10 is a diagram showing a matching circuit of an electronic device according to an embodiment. Figure 3 The flowchart of the operation method of the electronic device is shown;

[0020] Fig.11 is shown in more detail Fig.10 Flow chart of operation S1050;

[0021] Fig.12 is shown in more detail Fig.11 Flow chart of operation S1150;

[0022] Fig.13 is shown in more detail Fig.12 Flow chart of operation S1290;

[0023] Fig.14 is shown in more detail Fig.13 Flowchart of operation S1390. DETAILED DESCRIPTION

[0024] Principles and embodiments of the present invention generally relate to wireless power transfer devices that provide impedance matching to improve efficiency.

[0025] Hereinafter, embodiments will be described in detail with reference to the accompanying drawings.

[0026] Figure 1 is a block diagram showing an electronic device 10 according to an embodiment.

[0027] refer to Figure 1 , the electronic device 10 according to the embodiment may include an antenna 100 , an external matching circuit 200 , an energy harvesting circuit 300 , an external power conversion circuit 400 , and a battery 500 .

[0028] In various embodiments, the antenna 100 can receive power from an external wireless power transmission device. The antenna 100 can output an alternating current (AC) power signal by using a radio frequency (RF) wave formed around the antenna 100. The antenna 100 can be connected to an external matching circuit 200. The antenna 100 can generate an AC power signal in response to a wirelessly received signal. The AC power signal can be output from the antenna to the input terminal of the external matching circuit 200.

[0029] In various embodiments, the external matching circuit 200 may include at least one capacitor or at least one inductor. The external matching circuit 200 may perform impedance matching between the electronic device 10 and the external wireless power transmission device.

[0030] In various embodiments, the external matching circuit 200 may be configured to match the impedance (or load) wirelessly connected to the antenna 100. The external matching circuit 200 may be a fixed impedance matching circuit operably connected to the antenna 100, wherein, for example, the external matching circuit 200 may be configured to match the impedance (e.g., 50Ω) of an external wireless power transmission device communicating with the antenna 100. An example of the circuit configuration of the external matching circuit 200 may be as follows: Figure 2 As shown below, refer to Figure 2 This example is described in more detail.

[0031] In various embodiments, the external matching circuit 200 may output the input power signal to the energy harvesting circuit 300 by impedance matching the power signal received from the antenna 100 with the energy harvesting circuit 300. The external matching circuit 200 may maximize the power transmitted from the antenna 100 to the energy harvesting circuit 300, wherein the output power signal has a maximum voltage value among a plurality of output power signals.

[0032] In various embodiments, the energy harvesting circuit 300 may include a matching circuit 310, a power conversion circuit 320, and a controller 330. The controller may be electrically connected to the matching circuit 310. The energy harvesting circuit 300 may be connected to the external matching circuit 200 through the pad 340. The energy harvesting circuit 300 may be included in the electronic device 10 in the form of an integrated chip (IC).

[0033] In various embodiments, the matching circuit 310 may output a matching power signal by impedance matching the input power signal from the external matching circuit 200, wherein the matching circuit 310 may perform additional impedance matching on the input power signal that has been preliminarily impedance matched by the external matching circuit 200. Therefore, an output power signal as close as possible to the power signal received by the electronic device 10 through the antenna 100 may be output through the power conversion circuit 320.

[0034] In various embodiments, the matching circuit 310 may include a plurality of capacitors and a plurality of switches. The impedance value of the matching circuit 310 may be determined by the connection structure of the plurality of capacitors, and the impedance value of the matching circuit 310 may be referred to as a matching impedance value.

[0035] In various embodiments, the matching circuit 310 may have different matching impedance values ​​according to the connection states of the plurality of switches. The plurality of capacitors may have different connection structures according to the connection states of the plurality of switches, and therefore, the matching circuit 310 may have different matching impedance values. The matching impedance value may be determined by the connection arrangement of the plurality of capacitors, in which the capacitors may be connected in parallel.

[0036] In various embodiments, the connection state of the plurality of switches may be controlled by a switch signal received from the controller 330, wherein the matching impedance value of the matching circuit 310 may be controlled by the switch signal received from the controller 330. The switch signal received from the controller 330 may change the state of one or more of the plurality of switches between an “on” state and an “off” state, wherein the capacitor may be electrically connected to the matching circuit 310 in response to the associated switch being in the “on” state.

[0037] An example of the circuit configuration of the matching circuit 310 may be as follows Figure 3 As shown below, refer to Figure 3 This example is described in more detail.

[0038] In various embodiments, the power conversion circuit 320 may convert the matching power signal in AC form into an output power signal in direct current (DC) form. In an embodiment, the power conversion circuit 320 may include an RF-DC converter that converts the matching power signal in AC form into an output power signal in DC form.

[0039] In various embodiments, the controller 330 may control all operations of the electronic device 10. The controller 330 may send a switch signal for adjusting the connection state of a plurality of switches included in the matching circuit 310. The controller 330 may set the matching impedance value of the matching circuit 310 by sending the switch signal. The controller 330 sets the matching impedance value of the matching circuit 310, wherein the controller 330 adjusts the connection state of the plurality of switches through the switch signal so that the matching circuit 310 has a specific matching impedance value.

[0040] In various embodiments, the controller 330 may receive the output power signal from the power conversion circuit 320 while changing the matching impedance value of the matching circuit 310 .

[0041] In various embodiments, the controller 330 may set the matching impedance value of the matching circuit 310 through the switch signal, and may receive an output power signal corresponding to the set matching impedance value. In response, the controller 330 may change the matching impedance value of the matching circuit 310 by sending another switch signal to the matching circuit 310, and may receive an output power signal corresponding to the changed matching impedance value. The controller 330 may repeatedly change the matching impedance value of the matching circuit 310 through the switch signal, and receive an output power signal corresponding to the changed matching impedance value in an iterative manner through feedback.

[0042] In an embodiment, the controller 330 may receive an output power signal from the power conversion circuit 320 while increasing the matching impedance value by a first adjustment value. For example, in a first operation, the controller 330 may set the matching impedance value to 0C, and may receive an output power signal from the power conversion circuit 320. Hereinafter, C represents coulombs, and an impedance value to NC (N is a real number) may mean that the impedance value has a value corresponding to NC. In a second operation, when the first adjustment value is 1C, the controller 330 may set the matching impedance value to 1C, i.e., 0C is increased by 1C, and may receive an output power signal from the power conversion circuit 320. In a third operation, the controller 330 may set the matching impedance value to 2C, i.e., 1C is increased by 1C, and may receive an output power signal from the power conversion circuit 320. In subsequent operations, the controller 330 may set the matching impedance value to 3C, 4C, etc., and may receive a corresponding output power signal from the power conversion circuit 320.

[0043] In various embodiments, when the voltage value of the received output power signal is less than the voltage value of the previously received output power signal, the controller 330 may stop receiving the output power signal from the power conversion circuit 320 while increasing the matching impedance value by the first adjustment value. In other words, when the voltage value of the output power signal received in the current operation is less than the voltage value of the output power signal received in the previous operation, the controller 330 may stop receiving the output power signal. When the voltage value of the received output power signal does not increase, the controller 330 may stop receiving the output power signal. This is because, even when the controller 330 receives the output power signal while additionally increasing the matching impedance value, it is impossible to find a matching impedance value with higher power efficiency.

[0044] For example, when the voltage value of the output power signal when the matching impedance value is 3C is less than the voltage value of the output power signal when the matching impedance value is 2C, the controller 330 can set the matching impedance value to 4C and may not receive the output power signal from the power conversion circuit 320.

[0045] Herein, a condition such as "A value is less than B value" can be replaced with a condition such as "A value is less than or equal to B value". In addition, a condition such as "A value is greater than or equal to B value" can be replaced with a condition such as "A value is greater than B value".

[0046] In various embodiments, the controller 330 may select the best matching impedance value based on the received plurality of output power signals.

[0047] In an embodiment, the controller 330 may select a matching impedance value corresponding to an output power signal having a maximum voltage value among a plurality of output power signals as an optimal matching impedance value. For example, when the voltage value of the output power signal is greater than the voltage value of the output power signal when the matching impedance value is other values ​​when the matching impedance value is 2C, the controller 330 may select 2C as the optimal matching impedance value. In this case, because the controller 330 stops receiving the output power signal when the voltage value of the received output power signal does not increase, the controller 330 may set the matching impedance value corresponding to the second-to-last received output power signal to the optimal matching impedance value.

[0048] The controller 330 may set the optimal matching impedance value to the matching impedance value. For example, when the optimal matching impedance value is 2C, the controller 330 may set the matching impedance value to 2C through a switch signal. The electronic device 10 according to the embodiment may set the matching circuit 310 to have a matching impedance value corresponding to an output power signal having a maximum voltage value, thereby efficiently receiving power from an external wireless power transmission device.

[0049] In an embodiment, when the voltage value of the received output power signal is less than the voltage value of the previously received output power signal, the controller 330 may stop receiving the output power signal, and may receive an additional output power signal. The controller 330 may set an impedance value that is greater than the matching impedance value corresponding to the output power signal having the maximum voltage value among the plurality of output power signals by a second adjustment value as the matching impedance value, and may receive an additional output power signal from the power conversion circuit 320. In this case, the second adjustment value may be less than the first adjustment value, and the additional output power signal may be referred to as an output power signal.

[0050] For example, in the case where the first adjustment value is 1C and the second adjustment value is 0.5C, when the controller 330 receives only the output power signal up to the matching impedance value of 3C, before stopping receiving the output power signal, the controller 330 may set the matching impedance value to 2.5C and may receive an additional output power signal. In this case, because the controller 330 stops receiving the output power signal when the voltage value of the received output power signal does not increase, the controller 330 may set the matching impedance value to 2.5C, which is 0.5C greater than 2C (i.e., the matching impedance value corresponding to the second to last received output power signal), and may receive an additional output power signal.

[0051] In various embodiments, the controller 330 may select a matching impedance value corresponding to a larger value of the maximum voltage value of the plurality of output power signals and the voltage value of the additional output power signal as the optimal matching impedance value. For example, the controller 330 may select a matching impedance value corresponding to a larger voltage value as the optimal matching impedance value between 2.5C as the matching impedance value corresponding to the voltage value of the additional output power signal and 2C as the matching impedance value corresponding to the maximum voltage value of the plurality of output power signals.

[0052] In this way, the electronic device 10 according to the embodiment can select the best matching impedance value based on the additional output power signal (the additional output power signal is received based on the matching impedance value adjusted by using the second adjustment value smaller than the first adjustment value), thereby fine-tuning the matching impedance value of the matching circuit 310. The second adjustment value may be a value between two consecutive first adjustment values.

[0053] In various embodiments, the external power conversion circuit 400 may convert the output power signal in DC form into a power signal in DC form having a desired voltage value, wherein the voltage value may be within a predetermined range. In an embodiment, the external power conversion circuit 400 may include a DC-DC converter that converts the output power signal into a voltage compatible with the battery 500.

[0054] In various embodiments, the battery 500 may be operably connected to the energy harvesting circuit 300. The battery 500 may store energy by using a power signal output from the external power conversion circuit 400, wherein the battery 500 may be electrically connected to the energy harvesting circuit 300. Figure 1 The battery 500 is shown as a component connected to the external power conversion circuit 400 , but a driving unit for driving a load or various operations of the electronic device 10 may be included instead of the battery 500 .

[0055] Figure 2 is a circuit diagram showing an example of the external matching circuit 200 of the electronic device 10 according to the embodiment.

[0056] refer to Figure 2 , the external matching circuit 200 of the electronic device 10 may include an inductor 210 , a first capacitor 220 , and a second capacitor 230 .

[0057] In various embodiments, the inductor 210 may be connected between an input terminal of the external matching circuit 200 and an output terminal of the external matching circuit 200. The first capacitor 220 may be connected between the input terminal of the external matching circuit 200 and a ground terminal of the external matching circuit 200, wherein the first capacitor 220 may be electrically connected between the input terminal and the inductor 210. The second capacitor 230 may be connected between the output terminal of the external matching circuit 200 and a ground terminal of the external matching circuit 200, wherein the second capacitor 230 may be electrically connected between the inductor 210 and the output terminal.

[0058] In various embodiments, the inductor 210, the first capacitor 220, and the second capacitor 230 may provide an impedance that matches the impedance of the external wireless power transmission device. For example, when the impedance of the external wireless power transmission device is 50Ω, the total impedance of the inductor 210, the first capacitor 220, and the second capacitor 230 may be 50Ω.

[0059] although Figure 2 An embodiment in which the external matching circuit 200 has a pi circuit form including an inductor 210, a first capacitor 220, and a second capacitor 230 is shown, but the present inventive concept is not limited thereto. Figure 2 Different from the illustration of FIG. 1 , the external matching circuit 200 may be configured to have various forms including a combination of an inductor and a capacitor, such as an L-type circuit, an inverted L-type circuit, and the like.

[0060] Figure 3 is a circuit diagram showing an example of the matching circuit 310 of the electronic device 10 according to the embodiment.

[0061] refer to Figure 3, the matching circuit 310 of the electronic device 10 may include a plurality of capacitors C1 to C5 and a plurality of switches S1 to S6 .

[0062] The plurality of capacitors C1 to C5 can provide matching impedance values ​​to the matching circuit 310. The plurality of capacitors C1 to C5 can be electrically connected to each other according to the connection states of the plurality of switches S1 to S6, wherein the connection structure of the plurality of capacitors C1 to C5 can be adjusted, thereby adjusting the matching impedance value of the matching circuit 310.

[0063] In various embodiments, the plurality of capacitors C1 to C5 may include a plurality of parallel capacitors, ie, first to fourth parallel capacitors C1 to C4 and a series capacitor C5 .

[0064] In various embodiments, the first to fourth parallel capacitors C1 to C4 may be connected in parallel with each other between the ground terminal and the input terminal to which the input power signal is applied. Figure 3 An embodiment in which the matching circuit 310 includes four parallel capacitors (first parallel capacitor C1 to fourth parallel capacitor C4) is shown, but the inventive concept is not limited thereto, and the matching circuit 310 may include two, three, five or more parallel capacitors. However, for convenience, an embodiment including four parallel capacitors is mainly described.

[0065] In an embodiment, the first parallel capacitor C1 to the fourth parallel capacitor C4 may have the same capacitance value (e.g., farad). Thus, when the first parallel capacitor C1 to the fourth parallel capacitor C4 have the same capacitance value, the controller 330 may linearly increase the matching impedance value by increasing the number of parallel capacitors connected to each other among the first parallel capacitor C1 to the fourth parallel capacitor C4. For example, the controller 330 may increase the matching impedance value by the first adjustment value by increasing the number of parallel capacitors connected to each other among the first parallel capacitor C1 to the fourth parallel capacitor C4.

[0066] In various embodiments, the series capacitor C5 may be connected in series between any one of the first to fourth parallel capacitors C1 to C4 and the ground terminal. Figure 3 An embodiment in which the series capacitor C5 is located between the fourth parallel capacitor C4 and the ground terminal is shown, but the inventive concept is not limited thereto, and the series capacitor C5 may be connected between another parallel capacitor and the ground terminal. When the series capacitor C5 is connected between a parallel capacitor other than the fourth parallel capacitor C4 and the ground terminal, the connections of the plurality of switches S1 to S6 may also be partially changed. However, the embodiment in which the series capacitor C5 is connected between the fourth parallel capacitor C4 and the ground terminal is mainly described.

[0067] In an embodiment, the series capacitor C5 may have the same capacitance value as the first parallel capacitor C1 to the fourth parallel capacitor C4. In this case, the controller 330 may increase the matching impedance value by a second adjustment value (the second adjustment value is less than the first adjustment value) by connecting the series capacitor C5 to the fourth parallel capacitor C4. Based on the electrical connection of multiple capacitors, the matching impedance value may have discrete values.

[0068] As described above, the first to fourth parallel capacitors C1 to C4 and the series capacitor C5 may all have the same value. However, the first to fourth parallel capacitors C1 to C4 and the series capacitor C5 may each have a different value, or only some of the first to fourth parallel capacitors C1 to C4 and the series capacitor C5 may have the same value.

[0069] In various embodiments, the connection state of the plurality of switches S1 to S6 may be adjusted based on a switch signal received from the controller 330. According to the switch signal, the plurality of switches S1 to S6 may be in an on state (electrically connected state) or an off state (electrically disconnected state). Each of the plurality of switches S1 to S6 may be implemented as an electronic device, such as a metal oxide semiconductor field effect transistor (MOSFET), a bipolar junction transistor (BJT), etc., but is not limited thereto.

[0070] In various embodiments, the plurality of switches S1 to S6 may include a plurality of parallel switches, ie, first to fourth parallel switches S1 to S4 , a series switch S5 , and a middle switch S6 .

[0071] In various embodiments, the first to fourth parallel switches S1 to S4 may adjust the connections of the first to fourth parallel capacitors C1 to C4 based on the switch signal. Figure 3 In the embodiment, the first parallel switch S1 can change the electrical connection of the first parallel capacitor C1, the second parallel switch S2 can change the electrical connection of the second parallel capacitor C2, the third parallel switch S3 can change the electrical connection of the third parallel capacitor C3, and the fourth parallel switch S4 can change the electrical connection of the fourth parallel capacitor C4.

[0072] In various embodiments, the series switch S5 may change the electrical connection of the series capacitor C5 based on a switch signal.

[0073] In various embodiments, the intermediate switch S6 can change the parallel capacitor ( ) connected to the series capacitor C5 among the first parallel capacitor C1 to the fourth parallel capacitor C4 based on the switch signal. Figure 3 The fourth parallel capacitor C4 in the embodiment of Figure 3The electrical connection between the first parallel capacitor C1 to the third parallel capacitor C3 in the embodiment.

[0074] In various embodiments, the plurality of switches S1 to S6 may form different electrical connections according to the switch signals received from the controller 330, thereby changing the matching impedance value. Figure 3 As shown, when the plurality of switches S1 to S6 are all in the off state according to the switching signal received from the controller 330, the matching impedance value may be 0C.

[0075] You can refer to Figures 4 to 7 A description is given of a change in a matching impedance value according to a connection state of a plurality of switches S1 to S6 .

[0076] Figure 4 is a circuit diagram showing connection of switches when the matching impedance value of the matching circuit 310 of the electronic device 10 is 1C according to an embodiment.

[0077] refer to Figure 4 , it can be seen that the connection of the switch when the matching impedance value of the matching circuit 310 is 1C. In this case, the plurality of capacitors C1 to C5 may all have an impedance value of 1C.

[0078] In various embodiments, the controller 330 can adjust the first parallel switch S1 to be in the on state through the switch signal, and adjust the second parallel switch S2 to the fourth parallel switch S4, the series switch S5 and the middle switch S6 to be in the off state. In this case, only the first parallel capacitor C1 can affect the matching impedance value of the matching circuit 310, and the matching impedance value of the matching circuit 310 can be 1C.

[0079] However, with Figure 4 Different from the illustration of FIG. 3 , the controller 330 can adjust the second parallel switch S2 to be in the on state, and adjust the first parallel switch S1, the third parallel switch S3, the fourth parallel switch S4, the series switch S5 and the middle switch S6 to be in the off state, thereby setting the matching impedance value of the matching circuit 310 to 1C. Figure 4 Unlike the illustration of FIG. 3 , the controller 330 can adjust the third parallel switch S3 to be in the on state, and adjust the first parallel switch S1 and the second parallel switch S2, the fourth parallel switch S4, the series switch S5 and the middle switch S6 to be in the off state, thereby setting the matching impedance value of the matching circuit 310 to 1C. Figure 4 Different from the illustration, the controller 330 can adjust the fourth parallel switch S4 and the middle switch S6 to be in the on state, and adjust the first parallel switch S1 to the third parallel switch S3 and the series switch S5 to be in the off state, thereby setting the matching impedance value of the matching circuit 310 to 1C.

[0080] Figure 5 is a circuit diagram illustrating connection of switches when the matching impedance value of the matching circuit 310 of the electronic device 10 is 4C according to an embodiment.

[0081] refer to Figure 5 , we can see the connection of the switch when the matching impedance value of the matching circuit 310 is 4C. In this case, Figure 5 In the embodiment of the present invention, the plurality of capacitors C1 to C5 may all have an impedance value of 1C.

[0082] In various embodiments, the controller 330 can adjust the first parallel switch S1 to the fourth parallel switch S4 and the middle switch S6 to be in the on state through the switch signal, and adjust the series switch S5 to be in the off state. In this case, the first parallel capacitor C1 to the fourth parallel capacitor C4 can affect the matching impedance value of the matching circuit 310, and the matching impedance value of the matching circuit 310 can be 4C.

[0083] Figure 6 is a circuit diagram illustrating connection of switches when the matching impedance value of the matching circuit 310 of the electronic device 10 is 1.5C according to an embodiment.

[0084] refer to Figure 6 , it can be seen that the connection of the switch when the matching impedance value of the matching circuit 310 is 1.5C. In this case, the plurality of capacitors C1 to C5 may all have an impedance value of 1C.

[0085] In various embodiments, the controller 330 can adjust the first parallel switch S1, the fourth parallel switch S4 and the series switch S5 to be in the on state through the switch signal, and adjust the second parallel switch S2, the third parallel switch S3 and the middle switch S6 to be in the off state. In this case, the first parallel capacitor C1, the fourth parallel capacitor C4 and the series capacitor C5 can affect the matching impedance value of the matching circuit 310, and the matching impedance value of the matching circuit 310 can be 1.5C.

[0086] However, with Figure 6 Different from the illustration of FIG. 3 , the controller 330 can adjust the second parallel switch S2, the fourth parallel switch S4 and the series switch S5 to be in the on state, and adjust the first parallel switch S1, the third parallel switch S3 and the middle switch S6 to be in the off state, thereby setting the matching impedance value of the matching circuit 310 to 1.5C. Figure 6Different from the illustration, the controller 330 can adjust the third parallel switch S3, the fourth parallel switch S4 and the series switch S5 to be in the on state, and adjust the first parallel switch S1, the second parallel switch S2 and the middle switch S6 to be in the off state, thereby setting the matching impedance value of the matching circuit 310 to 1.5C.

[0087] Figure 7 : is a table showing the relationship between the matching impedance value of the matching circuit 310 of the electronic device 10 according to the embodiment and the connection state of the switch.

[0088] refer to Figure 7 , a table can be seen, which shows that: when the matching circuit 310 included in the electronic device 10 has Figure 3 When the structure shown in FIG. 1 and the plurality of capacitors C1 to C5 all have an impedance value of 1C, the controller 330 can match the impedance values ​​according to the connection states of the plurality of switches S1 to S6. Figure 7 The matching impedance value of the matching circuit 310 is adjusted according to the table shown in FIG.

[0089] In more detail, the controller 330 may adjust the matching impedance value of the matching circuit 310 to 0C by sending a switch signal so that all connection states of the plurality of switches S1 to S6 become an off state (OFF).

[0090] In various embodiments, the controller 330 can adjust the matching impedance value of the matching circuit 310 to 1C by sending a switching signal so that the connection state of the first parallel switch S1 becomes the on state (ON), and the connection state of the second parallel switch S2 to the fourth parallel switch S4, the series switch S5 and the middle switch S6 becomes the off state.

[0091] In various embodiments, the controller 330 can adjust the matching impedance value of the matching circuit 310 to 1.5C by sending a switching signal so that the connection state of the first parallel switch S1, the fourth parallel switch S4 and the series switch S5 becomes the on state, and the connection state of the second parallel switch S2, the third parallel switch S3 and the middle switch S6 becomes the off state.

[0092] In various embodiments, the controller 330 can adjust the matching impedance value of the matching circuit 310 to 2C by sending a switching signal so that the connection state of the first parallel switch S1 and the second parallel switch S2 becomes the on state, and the connection state of the third parallel switch S3, the fourth parallel switch S4, the series switch S5 and the middle switch S6 becomes the off state.

[0093] In various embodiments, the controller 330 can adjust the matching impedance value of the matching circuit 310 to 2.5C by sending a switching signal so that the connection state of the first parallel switch S1, the second parallel switch S2, the fourth parallel switch S4 and the series switch S5 becomes the on state, and the connection state of the third parallel switch S3 and the middle switch S6 becomes the off state.

[0094] In various embodiments, the controller 330 can adjust the matching impedance value of the matching circuit 310 to 3C by sending a switching signal so that the connection state of the first parallel switch S1 to the third parallel switch S3 becomes the on state, and the connection state of the fourth parallel switch S4, the series switch S5 and the middle switch S6 becomes the off state.

[0095] In various embodiments, the controller 330 can adjust the matching impedance value of the matching circuit 310 to 3.5C by sending a switching signal so that the connection state of the first parallel switch S1 to the fourth parallel switch S4 and the series switch S5 becomes the on state, and the connection state of the middle switch S6 becomes the off state.

[0096] In various embodiments, the controller 330 can adjust the matching impedance value of the matching circuit 310 to 4C by sending a switch signal so that the connection state of the first parallel switch S1 to the fourth parallel switch S4 and the middle switch S6 becomes the on state, and the connection state of the series switch S5 becomes the off state.

[0097] When the plurality of capacitors C1 to C5 all have different impedance values ​​or only some of the plurality of capacitors C1 to C5 have the same impedance value, the controller 330 may be configured based on the impedance of Figure 7 The table is used to adjust the matching impedance value of the matching circuit 310 by using different settings.

[0098] Figure 8 is a flowchart illustrating an operation method of the electronic device 10 according to an embodiment.

[0099] refer to Figure 8 In operation S810 , the electronic device 10 may receive an output power signal from the power conversion circuit 320 while changing a matching impedance value of the matching circuit 310 .

[0100] In various embodiments, the electronic device 10 may set the matching impedance value of the matching circuit 310 through a switch signal, and may receive an output power signal corresponding to the set matching impedance value. The electronic device 10 may change the matching impedance value of the matching circuit 310 by sending a subsequent switch signal to the matching circuit 310, and may receive an output power signal corresponding to the changed matching impedance value. Fig. 9 A more detailed embodiment of operation S810 is described.

[0101] In operation S820 , the electronic device 10 may select an optimal matching impedance value based on the plurality of output power signals.

[0102] In various embodiments, the electronic device 10 may select a matching impedance value corresponding to an output power signal having a maximum voltage value among a plurality of output power signals as an optimal matching impedance value.

[0103] In operation S830, the electronic device 10 may set the optimal matching impedance value as the matching impedance value.

[0104] Therefore, the electronic device 10 according to the embodiment may set the matching circuit 310 to have a matching impedance value corresponding to the output power signal having the maximum voltage value, thereby efficiently receiving power from the external wireless power transmission device.

[0105] Fig. 9 is shown in more detail Figure 8 Flow chart of operation S810.

[0106] refer to Fig. 9 , in operation S910, the electronic device 10 may receive the output power signal and simultaneously increase the matching impedance value by a first adjustment value.

[0107] For example, when the first adjustment value is 1C, the electronic device 10 may receive the output power signal while increasing the matching impedance value from 0C to 1C.

[0108] In operation S920, the electronic device 10 may determine whether a voltage value of the received output power signal is less than a voltage value of the previously received output power signal.

[0109] In response to determining that the voltage value of the received output power signal is greater than or equal to the voltage value of the previously received output power signal, returning to operation S910, the electronic device 10 may continue to receive the output power signal while increasing the matching impedance value by the first adjustment value.

[0110] In contrast, in response to determining that the voltage value of the received output power signal is less than the voltage value of the previously received output power signal, moving to operation S930, the electronic device 10 can increase the matching impedance value by a second adjustment value so that it is greater than the matching impedance value corresponding to the output power signal having the maximum voltage value, and receive an additional output power signal.

[0111] In this way, the electronic device 10 according to the embodiment can select the best matching impedance value based on the additional output power signal (the additional output power signal is received based on the matching impedance value adjusted by using the second adjustment value smaller than the first adjustment value), thereby fine-tuning the matching impedance value of the matching circuit 310. The second adjustment value may be an intermediate value less than 1C.

[0112] Fig.10 FIG. 1 is a diagram showing the matching circuit 310 of the electronic device 10 according to the embodiment. Figure 3 Shown is a flow chart of an operating method of the electronic device 10 .

[0113] refer to Fig.10 , an example of the operating method of the electronic device 10 can be seen, wherein the matching circuit 310 of the electronic device 10 has Figure 3 In the structure shown, the plurality of capacitors C1 to C5 have a resistance value of 1C, the first adjustment value is 1C, and the second adjustment value is 0.5C.

[0114] In operation S1010, the electronic device 10 may set the matching impedance value to a first impedance value. In this case, the first impedance value may be a minimum matching impedance value that the matching circuit 310 may have, and may be 0C. The electronic device 10 may set the matching impedance value to 0C by adjusting all of the multiple switches S1 to S6 included in the matching circuit 310 to be in an off state, wherein the matching circuit 310 may form an electrical short circuit between the terminals.

[0115] In operation S1020, the electronic device 10 may receive a first output power signal. The first output power signal may be an output power signal generated by the power conversion circuit 320 when the matching impedance value is 0C.

[0116] In operation S1030, the electronic device 10 may set the matching impedance value to a second impedance value that is greater than the first impedance value by a first adjustment value. In this case, the second impedance value may be 1C, and the second impedance value is greater than the first impedance value by the first adjustment value. The electronic device 10 may set the matching impedance value to 1C by adjusting the first parallel switch S1 included in the matching circuit 310 to be in an on state, and adjusting the second parallel switch S2 to the fourth parallel switch S4, the series switch S5, and the middle switch S6 included in the matching circuit 310 to be in an off state.

[0117] In operation S1040, the electronic device 10 may receive a second output power signal. The second output power signal may be an output power signal generated by the power conversion circuit 320 when the matching impedance value is 1C.

[0118] In operation S1050, the electronic device 10 may select an optimal matching impedance value based on a comparison result of the voltage value of the first output power signal and the voltage value of the second output power signal. Fig.11 Operation S1050 is described in more detail.

[0119] Fig.11 is shown in more detail Fig.10 Flowchart of operation S1050.

[0120] refer to Fig.11 , in operation S1110, the electronic device 10 may determine whether the voltage value of the first output power signal is greater than or equal to the voltage value of the second output power signal.

[0121] In response to determining that the voltage value of the first output power signal is greater than or equal to the voltage value of the second output power signal, moving to operation S1120, the electronic device 10 may select the first impedance value 0C as the best matching impedance value.

[0122] In contrast, in response to determining that the voltage value of the first output power signal is less than the voltage value of the second output power signal, moving to operation S1130, the electronic device 10 may set the matching impedance value to a third impedance value that is greater than the second impedance value by a first adjustment value. In this case, the third impedance value may be 2C, and the third impedance value is greater than the second impedance value by a first adjustment value. The electronic device 10 may set the matching impedance value to 2C by adjusting the first parallel switch S1 and the second parallel switch S2 included in the matching circuit 310 to be in an on state, and adjusting the third parallel switch S3, the fourth parallel switch S4, the series switch S5, and the middle switch S6 included in the matching circuit 310 to be in an off state.

[0123] In operation S1140, the electronic device 10 may receive a third output power signal. The third output power signal may be an output power signal generated by the power conversion circuit 320 when the matching impedance value is 2C.

[0124] In operation S1150, the electronic device 10 may select the best matching impedance value based on the comparison result of the voltage value of the second output power signal and the voltage value of the third output power signal. Fig.12 Operation S1150 is described in more detail.

[0125] Fig.12 is shown in more detail Fig.11 Flowchart of operation S1150.

[0126] refer to Fig.12, in operation S1210, the electronic device 10 may determine whether the voltage value of the second output power signal is greater than or equal to the voltage value of the third output power signal.

[0127] In response to determining that the voltage value of the second output power signal is greater than or equal to the voltage value of the third output power signal, moving to operation S1220, the electronic device 10 can set the matching impedance value to a fourth impedance value that is greater than the second impedance value by a second adjustment value. In this case, the fourth impedance value can be 1.5C, and the fourth impedance value is greater than the second impedance value by a second adjustment value. The electronic device 10 can set the matching impedance value to 1.5C by adjusting the first parallel switch S1, the fourth parallel switch S4, and the series switch S5 included in the matching circuit 310 to be in an on state, and adjusting the second parallel switch S2, the third parallel switch S3, the series switch S3, and the intermediate switch S6 included in the matching circuit 310 to be in an off state.

[0128] In operation S1230, the electronic device 10 may receive a fourth output power signal. The fourth output power signal may be an output power signal generated by the power conversion circuit 320 when the matching impedance value is 1.5C.

[0129] In operation S1240, the electronic device 10 may determine whether the voltage value of the second output power signal is greater than or equal to the voltage value of the fourth output power signal.

[0130] In response to determining that the voltage value of the second output power signal is greater than or equal to the voltage value of the fourth output power signal, moving to operation S1250, the electronic device 10 may select the second impedance value 1C as the best matching impedance value.

[0131] In contrast, in response to determining that the voltage value of the second output power signal is less than the voltage value of the fourth output power signal, moving to operation S1260, the electronic device 10 may select the fourth impedance value 1.5C as the best matching impedance value.

[0132] Returning to operation S1210, in response to determining that the voltage value of the second output power signal is less than the voltage value of the third output power signal, moving to operation S1270, the electronic device 10 may set the matching impedance value to a fifth impedance value that is greater than the third impedance value by a first adjustment value. In this case, the fifth impedance value may be 3C, and the fifth impedance value is greater than the third impedance value by a first adjustment value. The electronic device 10 may set the matching impedance value to 3C by adjusting the first parallel switch S1 to the third parallel switch S3 included in the matching circuit 310 to be in an on state, and adjusting the fourth parallel switch S4, the series switch S5, and the middle switch S6 included in the matching circuit 310 to be in an off state.

[0133] In operation S1280, the electronic device 10 may receive a fifth output power signal. The fifth output power signal may be an output power signal generated by the power conversion circuit 320 when the matching impedance value is 3C.

[0134] In operation S1290, the electronic device 10 may select the best matching impedance value based on the comparison result of the voltage value of the third output power signal and the voltage value of the fifth output power signal. Fig.13 Operation S1290 is described in more detail.

[0135] Fig.13 is shown in more detail Fig.12 Flowchart of operation S1290.

[0136] refer to Fig.13 , in operation S1310, the electronic device 10 may determine whether the voltage value of the third output power signal is greater than or equal to the voltage value of the fifth output power signal.

[0137] In response to determining that the voltage value of the third output power signal is greater than or equal to the voltage value of the fifth output power signal, moving to operation S1320, the electronic device 10 may set the matching impedance value to a sixth impedance value that is greater than the third impedance value by a second adjustment value. In this case, the sixth impedance value may be 2.5C, and the sixth impedance value is greater than the third impedance value by a second adjustment value. The electronic device 10 may set the matching impedance value to 2.5C by adjusting the first parallel switch S1, the second parallel switch S2, the fourth parallel switch S4, and the series switch S5 included in the matching circuit 310 to be in an on state, and adjusting the third parallel switch S3 and the intermediate switch S6 included in the matching circuit 310 to be in an off state.

[0138] In operation S1330, the electronic device 10 may receive a sixth output power signal. The sixth output power signal may be an output power signal generated by the power conversion circuit 320 when the matching impedance value is 2.5C.

[0139] In operation S1340, the electronic device 10 may determine whether the voltage value of the third output power signal is greater than or equal to the voltage value of the sixth output power signal.

[0140] In response to determining that the voltage value of the third output power signal is greater than or equal to the voltage value of the sixth output power signal, moving to operation S1350, the electronic device 10 may select the third impedance value 2C as the best matching impedance value.

[0141] In contrast, in response to determining that the voltage value of the third output power signal is less than the voltage value of the sixth output power signal, moving to operation S1360, the electronic device 10 may select the sixth impedance value 2.5C as the best matching impedance value.

[0142] Returning to operation S1310, in response to determining that the voltage value of the third output power signal is less than the voltage value of the fifth output power signal, moving to operation S1370, the electronic device 10 may set the matching impedance value to a seventh impedance value that is greater than the fifth impedance value by a first adjustment value. In this case, the seventh impedance value may be 4C, and the seventh impedance value is greater than the fifth impedance value by a first adjustment value. The electronic device 10 may set the matching impedance value to 4C by adjusting the first parallel switch S1 to the fourth parallel switch S4 and the middle switch S6 included in the matching circuit 310 to be in an on state, and adjusting the series switch S5 included in the matching circuit 310 to be in an off state.

[0143] In operation S1380, the electronic device 10 may receive a seventh output power signal. The seventh output power signal may be an output power signal generated by the power conversion circuit 320 when the matching impedance value is 4C.

[0144] In operation S1390, the electronic device 10 may select the best matching impedance value based on the comparison result of the voltage value of the fifth output power signal and the voltage value of the seventh output power signal. Fig.14 Operation S1390 is described in more detail.

[0145] Fig.14 is shown in more detail Fig.13 Flowchart of operation S1390.

[0146] refer to Fig.14 , in operation S1410, the electronic device 10 may determine whether the voltage value of the fifth output power signal is greater than or equal to the voltage value of the seventh output power signal.

[0147] In response to determining that the voltage value of the fifth output power signal is greater than or equal to the voltage value of the seventh output power signal, moving to operation S1420, the electronic device 10 may set the matching impedance value to an eighth impedance value that is greater than the fifth impedance value by a second adjustment value. In this case, the eighth impedance value may be 3.5C, and the eighth impedance value is greater than the fifth impedance value by a second adjustment value. The electronic device 10 may set the matching impedance value to 3.5C by adjusting the first parallel switch S1 to the fourth parallel switch S4 and the series switch S5 included in the matching circuit 310 to be in an on state, and adjusting the middle switch S6 included in the matching circuit 310 to be in an off state.

[0148] In operation S1430, the electronic device 10 may receive an eighth output power signal. The eighth output power signal may be an output power signal generated by the power conversion circuit 320 when the matching impedance value is 3.5C.

[0149] In operation S1440, the electronic device 10 may determine whether the voltage value of the fifth output power signal is greater than or equal to the voltage value of the eighth output power signal.

[0150] In response to determining that the voltage value of the fifth output power signal is greater than or equal to the voltage value of the eighth output power signal, moving to operation S1450, the electronic device 10 may select the fifth impedance value 3C as the best matching impedance value.

[0151] In contrast, in response to determining that the voltage value of the fifth output power signal is less than the voltage value of the eighth output power signal, moving to operation S1460, the electronic device 10 may select the eighth impedance value 3.5C as the best matching impedance value.

[0152] Returning to operation S1410, in response to determining that the voltage value of the fifth output power signal is less than the voltage value of the seventh output power signal, moving to operation S1470, the electronic device 10 may select the seventh impedance value 4C as the best matching impedance value. This is because the maximum matching impedance value that the matching circuit 310 can have is 4C.

[0153] When the electronic device 10 and the operating method thereof according to the embodiment as described above are used, by setting the matching circuit 310 to have a matching impedance value corresponding to the output power signal having the maximum voltage value, power can be efficiently received from the external wireless power transmission device. In addition, by selecting the optimal matching impedance value based on the additional output power signal (the additional output power signal is received based on the matching impedance value adjusted by using the second adjustment value smaller than the first adjustment value), the matching impedance value of the matching circuit 310 can be fine-tuned.

[0154] While the inventive concept has been particularly shown and described with reference to embodiments thereof, it will be understood that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure and the appended claims.

Claims

1. An electronic device, comprising: a matching circuit including a plurality of capacitors and a plurality of switches, having different matching impedance values ​​according to connection states of the plurality of switches, and configured to output a matching power signal by performing impedance matching on an input power signal; a power conversion circuit configured to convert the matching power signal in an alternating current (AC) form into an output power signal in a direct current (DC) form; and a controller configured to set a matching impedance value of the matching circuit by sending a switching signal to the plurality of switches, wherein the switch signal sets the connection state of the plurality of switches, and Wherein, the controller is further configured as follows: selecting an optimal matching impedance value based on a plurality of output power signals received from the power conversion circuit; and The optimal matching impedance value is set as the matching impedance value.

2. The electronic device according to claim 1, wherein: The controller is further configured to receive the output power signal from the power conversion circuit and simultaneously increase the matching impedance value by a first adjustment value.

3. The electronic device according to claim 2, wherein: The controller is further configured to stop receiving the output power signal from the power conversion circuit in response to a voltage value of the received output power signal being less than a voltage value of a previously received output power signal.

4. The electronic device according to claim 1, wherein: The controller is further configured to select a matching impedance value corresponding to an output power signal having a maximum voltage value among the plurality of output power signals as the optimal matching impedance value.

5. The electronic device according to claim 2, wherein: The controller is also configured to: In response to a voltage value of the received output power signal being less than a voltage value of a previously received output power signal, setting an impedance value that is greater than a matching impedance value corresponding to an output power signal having a maximum voltage value among the plurality of output power signals by a second adjustment value as the matching impedance value, and receiving an additional output power signal from the power conversion circuit; as well as selecting a matching impedance value corresponding to a larger value of the maximum voltage value of the plurality of output power signals and a voltage value of the additional output power signal as the optimal matching impedance value, The second adjustment value is smaller than the first adjustment value.

6. The electronic device according to claim 1, wherein: The plurality of capacitors include: a plurality of parallel capacitors connected in parallel with each other between the ground terminal and the input terminal; and a series capacitor connected in series between one of the plurality of parallel capacitors and the ground terminal, and The plurality of switches include: a plurality of parallel switches configured to adjust electrical connections of the plurality of parallel capacitors based on the switch signals; a series switch configured to change an electrical connection of the series capacitor to the one of the plurality of parallel capacitors based on the switch signal; and An intermediate switch is configured to adjust a connection between a parallel capacitor connected to the series capacitor and remaining parallel capacitors among the plurality of parallel capacitors based on the switch signal.

7. An electronic device, comprising: a matching circuit including a plurality of capacitors and a plurality of switches, having different matching impedance values ​​according to connection states of the plurality of switches, and configured to output a matching power signal by performing impedance matching on an input power signal; a power conversion circuit configured to convert the matching power signal in an alternating current (AC) form into an output power signal in a direct current (DC) form; and a controller configured to set the matching impedance value of the matching circuit by sending a switch signal for adjusting the connection state of the plurality of switches to the plurality of switches, Wherein, the controller is further configured as: setting the matching impedance value to a first impedance value and receiving a first output power signal from the power conversion circuit; setting the matching impedance value to a second impedance value that is greater than the first impedance value by a first adjustment value, and receiving a second output power signal from the power conversion circuit; as well as An optimal matching impedance value is selected based on a comparison result of the voltage value of the first output power signal and the voltage value of the second output power signal, and the optimal matching impedance value is set as the matching impedance value.

8. The electronic device according to claim 7, wherein: The controller is also configured to: When the voltage value of the first output power signal is greater than or equal to the voltage value of the second output power signal, selecting the first impedance value as the optimal matching impedance value; as well as When the voltage value of the first output power signal is less than the voltage value of the second output power signal, the matching impedance value is set to a third impedance value that is greater than the second impedance value by the first adjustment value, a third output power signal is received from the power conversion circuit, and the optimal matching impedance value is selected based on a comparison result of the voltage value of the second output power signal with the voltage value of the third output power signal.

9. The electronic device according to claim 8, wherein: The controller is also configured to: In response to the voltage value of the second output power signal being greater than or equal to the voltage value of the third output power signal, setting the matching impedance value to a fourth impedance value that is greater than the second impedance value by a second adjustment value, receiving a fourth output power signal from the power conversion circuit, and selecting the optimal matching impedance value based on a comparison result of the voltage value of the second output power signal and the voltage value of the fourth output power signal, wherein the second adjustment value is less than the first adjustment value; and In response to the voltage value of the second output power signal being less than the voltage value of the third output power signal, the matching impedance value is set to a fifth impedance value that is greater than the third impedance value by the first adjustment value, a fifth output power signal is received from the power conversion circuit, and the optimal matching impedance value is selected based on a comparison result of the voltage value of the third output power signal with the voltage value of the fifth output power signal.

10. The electronic device according to claim 9, wherein: The controller is also configured to: In response to the voltage value of the second output power signal being greater than or equal to the voltage value of the fourth output power signal, selecting the second impedance value as the optimal matching impedance value; as well as In response to the voltage value of the second output power signal being smaller than the voltage value of the fourth output power signal, the fourth impedance value is selected as the optimal matching impedance value.

11. The electronic device according to claim 9, wherein: The controller is also configured to: In response to the voltage value of the third output power signal being greater than or equal to the voltage value of the fifth output power signal, setting the matching impedance value to a sixth impedance value that is greater than the third impedance value by the second adjustment value, receiving a sixth output power signal from the power conversion circuit, and selecting the optimal matching impedance value based on a comparison result between the voltage value of the third output power signal and the voltage value of the sixth output power signal; and In response to the voltage value of the third output power signal being less than the voltage value of the fifth output power signal, the matching impedance value is set to a seventh impedance value that is greater than the fifth impedance value by the first adjustment value, a seventh output power signal is received from the power conversion circuit, and the optimal matching impedance value is selected based on a comparison result of the voltage value of the fifth output power signal with the voltage value of the seventh output power signal.

12. The electronic device according to claim 11, wherein: The controller is further configured to: In response to the voltage value of the third output power signal being greater than or equal to the voltage value of the sixth output power signal, selecting the third impedance value as the optimal matching impedance value; and In response to the voltage value of the third output power signal being smaller than the voltage value of the sixth output power signal, the sixth impedance value is selected as the optimal matching impedance value.

13. The electronic device according to claim 11, wherein: The controller is further configured to: In response to the voltage value of the fifth output power signal being greater than or equal to the voltage value of the seventh output power signal, setting the matching impedance value to an eighth impedance value that is greater than the fifth impedance value by the second adjustment value, receiving an eighth output power signal from the power conversion circuit, and selecting the optimal matching impedance value based on a comparison result between the voltage value of the fifth output power signal and the voltage value of the eighth output power signal; and In response to the voltage value of the fifth output power signal being smaller than the voltage value of the seventh output power signal, the seventh impedance value is selected as the optimal matching impedance value.

14. The electronic device according to claim 13, wherein: The controller is further configured to: In response to the voltage value of the fifth output power signal being greater than or equal to the voltage value of the eighth output power signal, selecting the fifth impedance value as the optimal matching impedance value; and In response to the voltage value of the fifth output power signal being smaller than the voltage value of the eighth output power signal, the eighth impedance value is selected as the optimal matching impedance value.

15. The electronic device according to claim 7, wherein: The plurality of capacitors include: a plurality of parallel capacitors connected in parallel with each other between a ground terminal and an input terminal to which the input power signal is applied; and a series capacitor connected in series between any one of the plurality of parallel capacitors and the ground terminal, and The plurality of switches include: a plurality of parallel switches configured to adjust connections of the plurality of parallel capacitors based on the switch signals; a series switch configured to adjust a connection of the series capacitor based on the switch signal; and An intermediate switch is configured to change a connection between a parallel capacitor connected to the series capacitor and remaining parallel capacitors among the plurality of parallel capacitors based on the switch signal.

16. An operating method of an electronic device, the electronic device comprising a matching circuit, a power conversion circuit and a controller; the matching circuit comprises a plurality of capacitors and a plurality of switches, has different matching impedance values ​​according to the connection states of the plurality of switches, and is configured to output a matching power signal by impedance matching an input power signal; the power conversion circuit is configured to convert the matching power signal in an alternating current (AC) form into an output power signal in a direct current (DC) form; The controller is configured to set the matching impedance value of the matching circuit by sending a switch signal to the plurality of switches to change the connection state of the plurality of switches, and the operation method includes: receiving the output power signal from the power conversion circuit; selecting an optimal matching impedance value based on the received plurality of output power signals; and The optimal matching impedance value is set as the matching impedance value.

17. The operating method according to claim 16, wherein: Receiving the output power signal includes: receiving the output power signal from the power conversion circuit and increasing the matching impedance value by a first adjustment value.

18. The operating method according to claim 17, further comprising: In response to a voltage value of the received output power signal being smaller than a voltage value of the previously received output power signal, receiving the output power signal is stopped.

19. The operating method according to claim 16, wherein: Selecting the optimal matching impedance value includes selecting a matching impedance value corresponding to an output power signal having a maximum voltage value among the plurality of output power signals as the optimal matching impedance value.

20. The operating method according to claim 17, wherein: Receiving the output power signal further includes: in response to a voltage value of the received output power signal being less than a voltage value of a previously received output power signal, setting an impedance value that is a second adjustment value greater than a matching impedance value corresponding to an output power signal having a maximum voltage value among the plurality of output power signals as the matching impedance value, and receiving an additional output power signal from the power conversion circuit, wherein the second adjustment value is smaller than the first adjustment value, and Selecting the optimal matching impedance value includes selecting a matching impedance value corresponding to a larger value of the maximum voltage value of the plurality of output power signals and a voltage value of the additional output power signal as the optimal matching impedance value.

Images