KR20220129850A - Apparatus, method and program for transmitting and receiving wireless power - Google Patents

Abstract

A wireless power transceiver device according to an embodiment of the present invention includes a wireless power transmitter and a wireless power receiver. The wireless power transmitter includes: a voltage adjusting unit for adjusting the voltage of rectified power supplied in the form of alternating current; a power transmission unit for generating a signal capable of wireless power transmission from the adjusted voltage output from the voltage adjusting unit and transmitting the generated signal to the wireless power receiver; and a transmission-side control unit for controlling the adjusted voltage based on the output voltage of the reception-side of the wireless power receiver. The wireless power receiver includes: a power reception unit for receiving power from the power transmission unit; and a reception-side control unit which calculates the maximum reception-side output voltage by controlling the reception-side output voltage of the wireless power receiver, and calculates the optimal capacitance of a capacitor included in the power reception unit based on the maximum reception-side output voltage. The maximum efficiency of a system can be maximized.

Description

Wireless power transceiver, method and program {APPARATUS, METHOD AND PROGRAM FOR TRANSMITTING AND RECEIVING WIRELESS POWER}

The present invention relates to an apparatus, method and program for transmitting and receiving wireless power.

The wired power transmission method is a method of transmitting and receiving power through a connected conductor wire, and is mainly used in various industries requiring power supply.

However, as the necessity of wirelessly transmitting and receiving power without a conductor wire has emerged, wireless power transmission technology has been developed, and various studies related thereto are being conducted.

Due to the inherent advantages of no contact loss, no mechanical wear, and guaranteed stability and reliability, the importance of wireless power transmission technology is rising, especially for unmanned aerial vehicles used in various fields such as surveillance, precision agriculture and logistics. Various studies are being conducted to apply wireless power transmission technology to a system.

Wireless power transmission technology applied to a wireless aircraft system has a problem in that efficiency is reduced due to misalignment. In addition, when the size of the secondary side is increased in order to solve the misalignment, a problem in that the weight is excessively increased may occur.

The wireless power transmission technology applied to the conventional wireless aircraft system only considers the maximum efficiency of the entire system and does not consider the average efficiency and stability of the entire system.

Republic of Korea Patent Publication No. 10-2016-0036986, published on April 05, 2016

An object of the present invention is to provide an apparatus, method, and program capable of solving the above problems.

SUMMARY OF THE INVENTION An object of the present invention is to provide a wireless power transmission/reception device, method, and program that provide a hybrid control method for controlling output and improving efficiency of a wireless charging system of an infinite aircraft.

The problems to be solved by the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

A wireless power transmission/reception apparatus according to an embodiment of the present invention includes a wireless power transmitter and a wireless power receiver.

In addition, the wireless power transmitter may include: a voltage adjusting unit configured to adjust a voltage of rectified power supplied in an alternating current form; a power transmitter for generating the adjusted voltage output from the voltage adjuster as a signal capable of wireless power transmission and transmitting it to the wireless power receiver; and a transmitting-side controller configured to control the adjustment voltage based on a receiving-side output voltage of the wireless power receiver.

The wireless power receiver may include: a power receiver configured to receive power from the power transmitter; and a receiving-side control unit for calculating a maximum receiving-side output voltage by controlling the receiving-side output voltage of the wireless power receiver, and calculating an optimal electric capacity of a capacitor included in the power receiving unit based on the maximum receiving-side output voltage can do.

In addition, the power receiver, an additional parallel capacitor connected in parallel with the capacitor; and a switch connected in parallel with the capacitor and turned on or off by the receiving-side control unit.

Also, the receiving-side control unit may calculate the maximum receiving-side output voltage by adjusting a duty cycle of the switch.

In addition, the receiving-side control unit samples a receiving-side output voltage in a state in which the duty cycle is primarily reduced by a preset duty cycle variation value as an existing receiving-side output voltage, and sets the duty cycle by the duty cycle variation value. Comparing the output voltage of the receiving side in a secondly reduced state with the output voltage of the existing receiving side, and when the comparison result is equal to or less than the reference voltage difference, the receiving side output voltage in the state in which the duty cycle variation value is reduced is the maximum reception It can be determined by the side output voltage.

Also, when the comparison result is greater than the reference voltage difference, the receiving-side control unit may perform the sampling process and the comparing process again.

In addition, the process of the receiving-side control unit calculating the maximum receiving-side output voltage may be performed in a state in which the adjustment voltage and operating frequency are set to preset adjustment voltage and set operation frequency.

In addition, the transmission-side control unit sets an initial reference adjustment voltage for the voltage adjustment unit and a reference reception-side output voltage for the wireless power receiver, and based on a comparison result of the reception-side output voltage and the reference reception-side output voltage Thus, it is possible to determine the reference adjustment voltage for the voltage adjuster.

Also, the transmitting-side control unit may set the initial reference adjustment voltage as the reference adjustment voltage when the reception-side output voltage and the reference reception-side output voltage are the same.

In addition, when the receiving-side output voltage is smaller than the reference receiving-side output voltage, the transmitting-side control unit adds a preset reference adjustment variation value to the initial reference adjustment voltage, and the receiving-side output voltage is the reference receiving-side output When it is greater than the voltage, the reference adjustment variation value may be reduced from the initial reference adjustment voltage.

Also, the transmitting-side control unit may perform feedback control based on a difference between the reference adjustment voltage and the adjustment voltage.

In addition, the wireless power transmitter may further include a rectifying unit for rectifying the power supplied in the form of AC and supplying it to the voltage adjusting unit.

In addition, the transmitting-side control unit calculates a reference current for the voltage adjuster based on the control result and the rectified output voltage of the rectifying unit, and provides feedback control based on a difference between the reference current and the current of the voltage adjuster. ) can be done.

In addition, the wireless power transmission/reception method according to an embodiment of the present invention is a method performed by a wireless power transmitter and a wireless power receiver, and includes the steps of controlling a reception-side output voltage of the wireless power receiver to calculate a maximum reception-side output voltage ; calculating an optimal electric capacity of a capacitor included in the wireless power receiver based on the maximum receiving-side output voltage; setting an initial reference adjustment voltage for a power factor correction (PFC) converter that is included in the wireless power transmitter and controls a voltage of supplied power; setting a reference reception-side output voltage for the wireless power receiver; and determining a reference adjustment voltage for the PFC converter based on a comparison result of the reception-side output voltage and the reference reception-side output voltage.

In addition, the wireless power receiver, a capacitor; an additional parallel capacitor connected in parallel with the capacitor; and a switch connected in parallel with the capacitor and turned on or off by a control signal.

The calculating of the maximum receiving-side output voltage may include: sampling a receiving-side output voltage in a state in which the duty cycle of the switch is reduced by a preset duty cycle variation value as an existing receiving-side output voltage; comparing the receiving-side output voltage in a state in which the duty cycle is reduced by the duty cycle variation value with the existing receiving-side output voltage; and determining the receiving-side output voltage as the maximum receiving-side output voltage when the comparison result is equal to or less than a reference voltage difference.

In addition, in the calculating of the maximum receiving-side output voltage, when the comparison result is greater than the reference voltage difference, the sampling and the comparing may be performed again.

In addition, the determining of the reference adjustment voltage may include setting the initial reference adjustment voltage as the reference adjustment voltage when the reception-side output voltage and the reference reception-side output voltage are the same.

The determining of the reference adjustment voltage may include: adding a preset reference adjustment variation value to the initial reference adjustment voltage when the receiving-side output voltage is smaller than the reference receiving-side output voltage; and reducing the reference adjustment variation value from the initial reference adjustment voltage when the reception-side output voltage is greater than the reference reception-side output voltage.

In addition to this, another method for implementing the present invention, another system, and a computer-readable recording medium for recording a computer program for executing the method may be further provided.

According to an embodiment of the present invention, the output voltage may be controlled by the adjustment voltage U _DC-link control, and a condition close to ZPA (Zero Phase Angle) may be achieved by the maximum output voltage tracking control.

In addition, according to an embodiment of the present invention, since Zero Voltage Switching (ZVS) is applied to both the primary side (transmitting side) and secondary side (receiving side) switches, turn-on switching loss can be reduced.

In addition, according to the embodiment of the present invention, since only the output voltage information needs to be transmitted to the primary side (transmitting side), the structure of the secondary side (receiving side) can be configured simply.

In addition, according to an embodiment of the present invention, it can be applied to a system of high power and misalignment conditions.

In addition, according to the embodiment of the present invention, the maximum efficiency of the system can be maximized.

Further, according to the embodiment of the present invention, since the range of the controllable output voltage and current is improved, the operating range of the system can be improved.

Effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the following description.

1 is a block diagram of a wireless transmission/reception system according to an embodiment of the present invention.
2 is a circuit diagram of a wireless transmission/reception system according to an embodiment of the present invention.
3 is a flowchart illustrating a control process of a wireless transmission/reception system according to an embodiment of the present invention.
4 and 5 are flowcharts illustrating a process of a wireless transmission/reception method according to an embodiment of the present invention.

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only these embodiments allow the disclosure of the present invention to be complete, and those of ordinary skill in the art to which the present invention pertains. It is provided to fully inform those skilled in the art of the scope of the present invention, and the present invention is only defined by the scope of the claims.

The terminology used herein is for the purpose of describing the embodiments and is not intended to limit the present invention. In this specification, the singular also includes the plural, unless specifically stated otherwise in the phrase. As used herein, “comprises” and/or “comprising” does not exclude the presence or addition of one or more other components in addition to the stated components. Like reference numerals refer to like elements throughout, and "and/or" includes each and every combination of one or more of the recited elements. Although "first", "second", etc. are used to describe various elements, these elements are not limited by these terms, of course. These terms are only used to distinguish one component from another. Therefore, it goes without saying that the first component mentioned below may be the second component within the spirit of the present invention.

Unless otherwise defined, all terms (including technical and scientific terms) used herein will have the meaning commonly understood by those of ordinary skill in the art to which this invention belongs. In addition, terms defined in a commonly used dictionary are not to be interpreted ideally or excessively unless clearly specifically defined.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a wireless transmission/reception system according to an embodiment of the present invention.

2 is a circuit diagram of a wireless transmission/reception system according to an embodiment of the present invention.

1 and 2 , a wireless transmission/reception system according to an embodiment of the present invention may include a power transmitter 10 and a power receiver 20 .

Description of the configuration of the power transmitter 10

The power transmitter 10 includes a power supply unit 11 , a PFC converter unit 12 , and a power transmission unit 13 .

The power receiver 20 may include a power receiver 21 and a rectifier 22 .

First, the configuration and operation of the power transmitter 10 will be described. The power supply unit 11 may supply AC power having a preset voltage U _grid .

The PFC converter unit 12 may include a rectifying unit 121 and a voltage adjusting unit 122 , and the rectifying unit 121 is electrically connected to the power supply unit 11 to receive AC power input from the power supply unit 11 . can be rectified.

In the illustrated embodiment, the rectifier 121 may be a full-bridge diode. The rectifying unit 121 may include four diodes 1211 , 1212 , 1213 , and 1214 .

However, the present invention is not limited thereto, and may be configured in the form of a half-bridge rectifier composed of two diodes, and may be configured in various types of known rectifier circuits.

The rectifier 121 is electrically connected to the power supply 11 and the voltage adjuster 122 .

The voltage regulator 122 includes an inductor 1221 , L _B , a switch 1222 , Q _B , a diode 1223 , D _B , and a capacitor 1224 . The transmitting-side control unit 31 is electrically connected to the switch 1222 and is configured to transmit a control signal to the switch 1222 . In addition, the transmitting-side control unit 31 is configured to receive the receiving-side output voltage U _o of the power receiver 20 .

In one embodiment, the switch 1222 may be a MOSFET device. The control process of the transmitting-side control unit 31 will be described in detail later.

In an embodiment not shown, the PFC converter unit 12 may be configured as a PFC (Power Factor Correction) circuit having a structure capable of step-up or step-down or a circuit having a structure capable of step-down.

AC power is adjusted to DC power in the PFC converter unit 12 .

In addition, the power transmitter 10 includes a power transmitter 13 . The power transmitter 13 includes a resonance signal generator 131 and a resonance part 132 electrically connected to the voltage regulator 122 .

The resonance signal generator 131 may convert the power input from the voltage adjuster 122 into a preset gain and transmit it to the resonance part 132 .

The resonance signal generator 131 is electrically connected to the capacitor 1224 , the first switches 1311 and Q1 , the second switches 1312 and Q2 , the third switches 1313 and Q3 , and the fourth switch 1314 . , Q4). In an embodiment, the first to fourth switches 1311 , 1312 , 1313 , and 1314 may be configured as MOSFET devices.

The resonance unit 132 is electrically connected to the resonance signal generator 131 , and includes capacitors 1322 and 1323 and coils 1321 and 1324 , and may constitute a resonance circuit.

Description of the configuration of the power receiver 20

Next, the configuration of the power receiver 20 will be described.

The power receiver 20 may include a power receiver 21 and a rectifier 22 .

The power receiver 21 may include a coil 211 and capacitors 212 and C _s connected in series with the coil 211 . In addition, the power receiver 21 includes a parallel capacitor 213 , C _SN connected in parallel with the capacitor 212 and a switch 214 , Q ₅ .

The switch 214 is configured to be electrically connectable to the receiving-side control unit 32 (see FIG. 3 ), and receives a control signal from the receiving-side control unit 32 . The control operation process of the receiving-side control unit 32 will be described in detail later. In one embodiment, the switch 214 may be configured as a MOSFET device.

The rectifier 22 is electrically connected to the power receiver 21 , and includes a first diode 221 , D1 , a second diode 222 , D2 , a third diode 223 , D3 , and a fourth diode 224 , D4 . ) is included. However, the present invention is not limited thereto, and the rectifier 22 may include a half-bridge rectifier composed of two diodes or a rectifier circuit having various known configurations.

The rectifying unit 22 includes a capacitor 225 , C _O , and the capacitor 225 may be connected in parallel with a rectifying circuit configured by the first to fourth diodes 221 , 222 , 223 and 224 .

Description of the control process of the wireless power transmission/reception system

Referring to FIG. 3 , a control process of a wireless power transmission/reception system according to an embodiment of the present invention is illustrated.

Under the misalignment condition, the reactance (L _P ) value of the coil 1324 of the power transmitter 13 is kept constant, but the reactance ( _LS ) value of the coil 211 of the power receiver 21 is the position of the power receiver may be changed according to

In order to compensate for the change in the reactance L _S , the capacitor 212 of the power receiver 21 is connected in parallel with the parallel capacitor 213 and the switch 214 . As the switch 214 is Pulse Width _Modulcated Control (PWM-Control) in a preset method by the receiving-side controller 32 , the change in the reactance LS may be compensated.

The average tuning capacitance of the capacitor 212 and the parallel capacitor 213 may be derived by Equation 1 below.

The average adjustment capacitance (C _EQ ) is the capacitance of the capacitor 212 (C _S ), the capacitance of the parallel capacitor 213 (C _SN ), the time the PWM signal is ON (t _on ), the time the PWM signal is OFF In time (t _off ), it can be derived by the total time (T, t _on +t _off ).

Also, the resonance frequency wo may be derived by Equation 2 below.

In addition, the total electric capacity (C' _S ) may be derived by Equation 3 below.

In addition, the adjusted impedance (Z' _S ) of the power receiving side in the resonance condition may be derived by Equation 4 below.

Also, the adjusted input-side impedance Z' _in may be derived by Equation 5 below.

In addition, the mutual inductance (M) of the transmitting side and the receiving side can be derived by Equation 6 below. K represents a coupling coefficient.

In addition, the adjusted receiving-side current (I' _S ) may be derived through Equation 7 below.

In addition, the adjusted voltage conversion ratio ( _G'V ) may be derived through Equation 8 below.

In addition, by differentiating the receiving-side voltage U _ab with respect to the mutual inductance M, Equation 9 below may be derived.

Through Equations 8 and 9, it can be seen that the maximum output voltage gain is generated under a resonance condition between C _S and L _S . In this case, the condition that the right side of Equation (9) becomes 0 represents the condition.

It can also be seen that C _EQ is zero when the maximum output voltage gain is generated.

However, in order to satisfy the fluctuation of _LS due to misalignment, it is necessary to find an appropriate value of C _EQ .

Consequently, since resonance occurs at the maximum output voltage condition, an optimized C _'S value can be specified by tracking the maximum output voltage.

4 shows a process of specifying the maximum output voltage.

Referring to FIG. 4 , the receiving-side control unit 32 calculates the maximum receiving-side output voltage by controlling the receiving-side output voltage U _O of the power receiver 20 , and power based on the calculated maximum receiving-side output voltage. The optimal capacitance C' _S of the capacitor included in the receiver 21 is calculated.

The receiving-side control unit 32 adjusts the receiving-side output voltage U _O by adjusting the duty cycle of the switch 214 .

First, the voltage (U _DC-link ) of the capacitor 1224 of the PFC converter unit 12 is set to a preset voltage, and the operating frequency is set to the preset frequency (S11). In an embodiment, the preset voltage may be set to 320V, and the preset frequency may be set to 150 kHz).

Adjustment of the voltage U _DC-link of the capacitor 1224 may be performed based on a control signal transmitted from the power receiver 20 to the power transmitter 10 .

Next, the receiving-side control unit 32 primarily reduces the duty cycle of the switch 214 by a preset duty cycle variation value (S12).

In an embodiment, the receiving-side control unit 32 may set the initial duty cycle to 1 and set the duty cycle variation value to 0.05. However, the present invention is not limited thereto.

Next, the receiving-side control unit 32 samples the receiving-side output voltage in a state in which the duty cycle is primarily reduced as the existing receiving-side output voltage U _{o_old} ( S13 ).

Next, the receiving-side control unit 32 secondarily reduces the duty cycle of the switch 214 by a preset duty cycle variation value (S13).

In one embodiment, the duty cycle variation value may be set to 0.05. However, the present invention is not limited thereto.

Next, the receiving-side control unit 32 samples the receiving-side output voltage in a state in which the duty cycle is secondarily reduced as the receiving-side output voltage U _o ( S15 ).

Next, the receiving-side control unit 32 compares the receiving-side output voltage U _o with the existing receiving-side output voltage U _{o_old} ( S16 ).

When the comparison result is less than or equal to the preset reference voltage difference, the receiving-side control unit 32 determines the receiving-side output voltage U _o in a state in which the duty cycle variation value is secondarily reduced as the maximum receiving-side output voltage.

In one embodiment, the reference voltage difference may be set to 0.5V. However, the present invention is not limited thereto.

When the comparison result is greater than the reference voltage difference, the receiving-side control unit 32 repeats the process of sampling and comparing the existing receiving-side measured voltage and the receiving-side measured voltage.

That is, the receiving-side control unit 32 further reduces the duty cycle of the switch 214 by a preset duty cycle variation value (S17). When the duty cycle variation value is further reduced, the receiving-side control unit 32 samples the receiving-side output voltage in the reduced duty cycle state as the existing receiving-side output voltage Uo_old, and further reduces the duty cycle to the receiving side The output voltage Uo is sampled and compared with each other. When the comparison result is less than or equal to the preset reference voltage difference, the receiving-side output voltage Uo is determined as the maximum receiving-side output voltage.

Through the above-described process, the duty cycle and C′ _S at the maximum receiving-side output voltage can be specified.

In addition, according to an embodiment of the present invention, the transmitting-side control unit 31 may control the voltage (U _DC-link ) of the capacitor 1224 of the PFC converter unit 12 in order to increase control accuracy. It also allows for simultaneous adjustment of the output voltage.

5 shows a process of controlling the voltage (U _DC-link ) of the capacitor 1224 .

Referring to FIG. 5 , the transmitting-side control unit 31 sets an initial reference adjustment voltage _{UDC-link_ref} for the voltage adjustment unit 122 and a reference reception-side output voltage U _{o_ref} for the power receiver 20 ( S21).

In an embodiment, the initial reference adjustment voltage _{UDC-link_ref} may be set to 320V, and the reference reception-side output voltage U _{o_ref} may be set to 48V. However, the present invention is not limited thereto.

In addition, the transmitting-side control unit 31 samples the receiving-side output voltage U _o measured by the power receiver 20 and the voltage U _DC-link of the capacitor 1224 of the voltage adjusting unit 122 .

Next, the transmitting-side control unit 31 determines whether the receiving-side output voltage U _o and the reference receiving-side output voltage U _{o_ref} are the same ( S22 ).

In the same case, the transmitting-side control unit 31 maintains the same initial reference adjustment voltage U _{DC-link_ref_old} as the reference adjustment voltage U _{DC-link_ref} ( S23 ).

When the receiving-side output voltage (U _o ) is less than the reference receiving-side output voltage (U _{o_ref} ), the transmitting-side control unit 31 sets a preset reference adjustment variation value (ΔU _DC- ) in the initial reference adjustment voltage (U _{DC-link_ref_old} ) _{link_ref} ) to reset the reference adjustment voltage U _{DC-link_ref} (S25). In an embodiment, the preset reference adjustment variation value ΔU _{DC-link_ref} may be set to 0.1V. However, the present invention is not limited thereto.

When the receiving-side output voltage (U _o ) is greater than the reference receiving-side output voltage (U _{o_ref} ), the transmitting-side control unit 31 sets a preset reference adjustment variation value (ΔU _DC- ) in the initial reference adjustment voltage (U _{DC-link_ref_old} ) _{link_ref} ) to reset the reference adjustment voltage U _{DC-link_ref} (S25). In an embodiment, the preset reference adjustment variation value ΔU _{DC-link_ref} may be set to 0.1V. However, the present invention is not limited thereto.

After step S24 or S25 is completed, the transmitting-side control unit 31 determines whether the receiving-side output voltage U _o and the reference receiving-side output voltage U _{o_ref} are the same ( S22 ).

In the same case, the transmitting-side control unit 31 maintains the same initial reference adjustment voltage U _{DC-link_ref_old} as the reference adjustment voltage U _{DC-link_ref} ( S23 ).

That is, the transmitting-side control unit 31 repeats steps S24, S25, and S23 until the receiving-side output voltage U _o and the reference receiving-side output voltage U _{o_ref} match.

Through this process, the reference adjustment voltage U _{DC-link_ref} may be specified.

In addition, the transmitting-side control unit 31 performs feedback control based on the difference between the specified reference adjustment voltage (U _{DC-link_ref} ) and the voltage (U _DC-link ) of the capacitor 1224 . In an embodiment, a Portional-Integral (PI) control may be performed. However, the present invention is not limited thereto, and methods such as P control, PID control, and fuzzy control may be used.

In addition, the transmitting-side control unit 31 calculates the reference current I _{LB_ref} for the voltage adjuster 122 based on the feedback control result and the rectified output voltage lU _rec l of the rectifier 121 , and the reference current I _{LB_ref} ) and the current (I _LB ) of the voltage adjuster 122 performs a feedback control based on the difference (Feedback Controll). In an embodiment, a Portional-Integral (PI) control may be performed. However, the present invention is not limited thereto, and methods such as P control, PID control, and fuzzy control may be used.

In an embodiment, the transmitting-side controller 31 may configure a voltage loop as an outer loop and a current loop as an inner loop.

By calculating the reference adjustment voltage (U _{DC-link_ref} ) and applying the double loop control, the AC input voltage has the same phase. In addition, the adjustment voltage U _DC-link can be precisely controlled.

As the double loop control is applied, the stability and accuracy of the adjustment voltage (U _DC-link ) is guaranteed, and the reference adjustment voltage (U _{DC-link_ref} ) can be adjusted even under misalignment conditions by the calculation method of the reference adjustment voltage (U _{DC-link_ref} ). can be calculated accurately.

In addition, since the coupling coefficient (k) estimation method is not used, it is possible to prevent inaccurate estimation of the coupling coefficient (k) from occurring.

In addition, since the receiving-side output voltage U _O is controlled by the power transmitter 10 in a state where the operating frequency is fixed, the size of the power receiver 20 can be reduced.

The relationship between the adjustment voltage U _DC-link and the resonant network components (Resonant network components, L _in , C _P , C _f , C _S , L _B , etc.) may be defined by Equation 10 (RMS value).

In addition, the relationship between the input voltage U _ab of the rectifying unit 22 and the receiving-side output voltage U _O may be defined by Equations 11 and 12 (RMS value).

AC/DC equivalent resistance may be defined by Equation 13 below.

Description of the effect of the control of the wireless power transmission/reception system according to an embodiment of the present invention

According to an embodiment of the present invention, a hybrid control method for output control and efficiency improvement of a wireless charging system of an infinite aircraft is provided.

The output voltage may be controlled by the adjustment voltage U _DC-link control of the PFC converter unit 12, and a condition close to ZPA (Zero Phase Angle) is achieved by the maximum output voltage tracking control.

In addition, since ZVS (Zero Voltage Switching) is applied to both the primary side (transmitting side) and secondary side (receiving side) switches, the turn-on switching loss is reduced.

In addition, since the control method according to the embodiment of the present invention only needs to transmit the output voltage information to the primary side (transmitting side), it has a simple structure.

In addition, the control method according to the embodiment of the present invention can be applied to a system of high power and misalignment conditions.

In addition, according to the control method according to the embodiment of the present invention, the maximum efficiency of the system can be maximized.

In addition, according to the control method according to the embodiment of the present invention, since the range of the controllable output voltage and current is improved, the operating range of the system can be improved.

Each of the above-described components of the wireless power transmitter and the wireless power receiver according to various embodiments of the present invention may be composed of one or more components, and the names of the components may be changed.

The wireless power transmitter and the wireless power receiver according to various embodiments of the present disclosure may include at least one of the above-described components, and some components may be omitted or may further include additional other components.

In addition, since some of the components of the wireless power transmitter and the wireless power receiver according to various embodiments of the present invention are combined to form a single entity, the functions of the components prior to being combined are equally performed. can

The wireless power transmission/reception method according to the embodiment of the present invention described above may be implemented as a program (or application) and stored in a medium in order to be executed in combination with a server that is hardware.

The above-described program is C, C++, JAVA, machine language, etc. that a processor (CPU) of the computer can read through a device interface of the computer in order for the computer to read the program and execute the methods implemented as a program It may include code (Code) coded in the computer language of Such code may include functional code related to a function defining functions necessary for executing the methods, etc. can do. In addition, the code may further include additional information necessary for the processor of the computer to execute the functions or code related to memory reference for which location (address address) in the internal or external memory of the computer should be referenced. have. In addition, when the processor of the computer needs to communicate with any other computer or server located remotely in order to execute the functions, the code uses the communication module of the computer to determine how to communicate with any other computer or server remotely. It may further include a communication-related code for whether to communicate and what information or media to transmit and receive during communication.

The storage medium is not a medium that stores data for a short moment, such as a register, a cache, a memory, etc., but a medium that stores data semi-permanently and can be read by a device. Specifically, examples of the storage medium include, but are not limited to, ROM, RAM, CD-ROM, magnetic tape, floppy disk, and optical data storage device. That is, the program may be stored in various recording media on various servers accessible by the computer or in various recording media on the computer of the user. In addition, the medium may be distributed in a computer system connected by a network, and computer-readable codes may be stored in a distributed manner.

The steps of the method or algorithm described in relation to the embodiment of the present invention may be implemented directly in hardware, implemented as a software module executed by hardware, or implemented by a combination thereof. A software module may include random access memory (RAM), read only memory (ROM), erasable programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), flash memory, hard disk, removable disk, CD-ROM, or It may reside in any type of computer-readable recording medium well known in the art to which the present invention pertains.

As mentioned above, although embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art to which the present invention pertains can realize that the present invention can be embodied in other specific forms without changing its technical spirit or essential features. you will be able to understand Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive.

10: power transmitter
11: power supply
121: rectifying unit
1211: diode
1212: diode
1213: diode
1214: diode
122: voltage regulator
1221: inductor
1222: switch
1223: diode
1224: capacitor
12: voltage regulator
13: power transmitter
131: resonance signal generator
1311: first switch
1312: second switch
1313: third switch
1314: fourth switch
132: resonance unit
1321: coil
1322: capacitor
1323: capacitor
1324: coil
20: power receiver
21: power receiver
211: coil
212: capacitor
213: parallel capacitor
214: switch
22: rectifying unit
221: first diode
222: second diode
223: third diode
224: fourth diode
225: capacitor
31: transmitting side control unit
32: receiving-side control unit

Claims (17)

A wireless power transmission/reception device including a wireless power transmitter and a wireless power receiver,
The wireless power transmitter,
A voltage adjusting unit for adjusting the voltage of the rectified power supplied in the form of alternating current;
a power transmitter for generating the adjusted voltage output from the voltage adjuster as a signal capable of wireless power transmission and transmitting it to the wireless power receiver; and
a transmitting-side control unit for controlling the adjustment voltage based on the receiving-side output voltage of the wireless power receiver;
The wireless power receiver,
a power receiver configured to receive power from the power transmitter; and
a receiving-side control unit for calculating a maximum receiving-side output voltage by controlling the receiving-side output voltage of the wireless power receiver, and calculating an optimal electric capacity of a capacitor included in the power receiving unit based on the maximum receiving-side output voltage ,
Wireless power transceiver. According to claim 1,
The power receiver,
an additional parallel capacitor connected in parallel with the capacitor; and
and a switch connected in parallel with the capacitor and turned on or off by the receiving-side control unit,
The receiving side control unit,
To calculate the maximum receiving-side output voltage by adjusting the duty cycle of the switch,
Wireless power transceiver. 3. The method of claim 2,
The receiving side control unit,
sampling the receiving-side output voltage in a state in which the duty cycle is primarily reduced by a preset duty cycle variation value as an existing receiving-side output voltage,
comparing the receiving-side output voltage in a state in which the duty cycle is secondarily reduced by the duty cycle variation value and the existing receiving-side output voltage,
When the comparison result is less than or equal to a preset reference voltage difference, determining the receiving-side output voltage in a state in which the duty cycle variation value is reduced as the maximum receiving-side output voltage,
Wireless power transceiver. 4. The method of claim 3,
The receiving side control unit,
When the comparison result is greater than the reference voltage difference, the sampling and the comparing are performed again.
Wireless power transceiver. 4. The method of claim 3,
The process of the receiving-side control unit calculating the maximum receiving-side output voltage,
The adjustment voltage and operating frequency will be performed in a state set to a preset adjustment voltage and set operating frequency,
Wireless power transceiver. According to claim 1,
The transmitting side control unit,
setting an initial reference adjustment voltage for the voltage adjuster and a reference receiving-side output voltage for the wireless power receiver,
determining a reference adjustment voltage for the voltage adjustment unit based on a comparison result of the reception-side output voltage and the reference reception-side output voltage,
Wireless power transceiver. 7. The method of claim 6,
The transmitting side control unit,
When the receiving-side output voltage and the reference receiving-side output voltage are the same, the initial reference adjustment voltage is set as the reference adjustment voltage,
Wireless power transceiver. 7. The method of claim 6,
The transmitting side control unit,
When the receiving-side output voltage is less than the reference receiving-side output voltage, adding a preset reference adjustment variation value to the initial reference adjustment voltage,
When the receiving-side output voltage is greater than the reference receiving-side output voltage, reducing the reference adjustment variation value from the initial reference adjustment voltage,
Wireless power transceiver. 7. The method of claim 6,
The transmitting side control unit,
To perform feedback control based on the difference between the reference adjustment voltage and the adjustment voltage,
Wireless power transceiver. 10. The method of claim 9,
The wireless power transmitter further comprises a rectifying unit for rectifying the power supplied in the form of alternating current and supplying it to the voltage adjusting unit,
The transmitting side control unit,
calculating a reference current for the voltage adjusting unit based on the control result and the rectified output voltage of the rectifying unit;
To perform feedback control based on the difference between the reference current and the current of the voltage regulator,
Wireless power transceiver. A method performed by a wireless power transmitter and a wireless power receiver, comprising:
calculating a maximum receiving-side output voltage by controlling the receiving-side output voltage of the wireless power receiver;
calculating an optimal electric capacity of a capacitor included in the wireless power receiver based on the maximum receiving-side output voltage;
setting an initial reference adjustment voltage for a power factor correction (PFC) converter that is included in the wireless power transmitter and controls a voltage of supplied power;
setting a reference reception-side output voltage for the wireless power receiver; and
determining a reference adjustment voltage for the PFC converter based on a comparison result of the reception-side output voltage and the reference reception-side output voltage;
How to transmit and receive wireless power. 12. The method of claim 11,
The wireless power receiver,
capacitor;
an additional parallel capacitor connected in parallel with the capacitor; and
Including a switch connected in parallel with the capacitor and turned on or off by a control signal,
How to transmit and receive wireless power. 13. The method of claim 12,
Calculating the maximum receiving-side output voltage comprises:
sampling a receiving-side output voltage in a state in which the duty cycle of the switch is reduced by a preset duty cycle variation value as an existing receiving-side output voltage;
comparing the receiving-side output voltage in a state in which the duty cycle is reduced by the duty cycle variation value with the existing receiving-side output voltage; and
determining the receiving-side output voltage as the maximum receiving-side output voltage when the comparison result is equal to or less than a reference voltage difference;
How to transmit and receive wireless power. 14. The method of claim 13,
Calculating the maximum receiving-side output voltage comprises:
When the comparison result is greater than the reference voltage difference, the sampling and the comparing are performed again,
How to transmit and receive wireless power. 12. The method of claim 11,
The step of determining the reference adjustment voltage comprises:
When the receiving-side output voltage and the reference receiving-side output voltage are the same, the initial reference adjustment voltage is set as the reference adjustment voltage,
How to transmit and receive wireless power. 12. The method of claim 11,
The step of determining the reference adjustment voltage comprises:
adding a preset reference adjustment variation value to the initial reference adjustment voltage when the receiving-side output voltage is smaller than the reference receiving-side output voltage; and
reducing the reference adjustment variation value from the initial reference adjustment voltage when the receiving-side output voltage is greater than the reference receiving-side output voltage;
How to transmit and receive wireless power. In combination with a computer, which is hardware, stored in a computer-readable recording medium to execute the method of any one of claims 11 to 16,
program.

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