KR102679814B1 - Wireless power receiving apparatus having multiple power mode and wireless power receiving method using same - Google Patents

Abstract

The present invention relates to a wireless power reception device having multiple power modes, comprising: a variable power distribution unit that distributes input power; a rectifier that rectifies the input power distributed by the variable power distribution unit; a power control unit that converts the power rectified in the rectifier into DC power and transfers the DC power to a battery; And an impedance that senses the voltage change of the DC power delivered to the battery to determine the size of the input power, and determines an appropriate power distribution ratio of the input power distributed by the variable power distribution unit according to the determined size of the input power. Includes a variable control unit. As a result, the appropriate distribution ratio for distributing the input power can be varied according to the size of the input power, and the input power distributed according to the appropriate power distribution ratio can be rectified with high efficiency to achieve high power conversion efficiency.

Description

Wireless power receiving device having multiple power modes and wireless power receiving method using the same {WIRELESS POWER RECEIVING APPARATUS HAVING MULTIPLE POWER MODE AND WIRELESS POWER RECEIVING METHOD USING SAME}

The present invention relates to a wireless power receiving device having multiple power modes and a wireless power receiving method using the same. More specifically, a wireless power receiving device having multiple power modes capable of varying the power distribution ratio according to input power and a wireless power receiving method using the same. It relates to a method of receiving power wirelessly.

With the development of wireless communication technology, convenience as well as high portability are required when using various devices such as small electronic devices and large home appliances.

In order to increase portability and convenience, technology is needed to freely transmit not only information but also power for device use.

Accordingly, as a technology for transmitting wireless power, electromagnetic wave-based wireless power transmission technology is being developed, which has the advantage of enabling free transmission of power regardless of the movement and size of electronic devices.

However, there is a problem in the electromagnetic wave wireless power transmission system that the size of the received input power varies greatly depending on the distance between the transmitter and receiver. Therefore, in order to convert power received from various locations with high efficiency, it is necessary to develop a rectifier that maintains high efficiency regardless of input power.

Since the optimal impedance of the rectifier changes depending on the input power, research is being conducted on various rectifiers with a wide input power range taking impedance change into consideration.

The simplest way to construct a rectifier with a wide input power range is to use a matching network that can match over a wide input power range.

A more sophisticated method may be a method of improving matching performance in a wide input power range by controlling the matching network to match to the optimal impedance according to the input power, as shown in FIG. 1.

However, this conventional method has the limitation that the maximum input power range is limited because it considers the breakdown voltage of a single rectifier diode.

Korean Patent Publication No. 10-2012-0128321

The present invention was created to solve the above problem, and the purpose of the present invention is to change the appropriate distribution ratio for distributing input power according to the size of the input power, and to change the input power distributed according to the appropriate power distribution ratio. To provide a wireless power reception device having multiple power modes that can have high power conversion efficiency by rectifying the power with high efficiency.

A wireless power reception device with multiple power modes according to an embodiment of the present invention to achieve the above object includes a variable power distribution unit that distributes input power; a rectifier that rectifies the input power distributed by the variable power distribution unit; a power control unit that converts the power rectified by the rectifier into DC power and transfers the DC power to a battery; And an impedance that senses the voltage change of the DC power delivered to the battery to determine the size of the input power, and determines an appropriate power distribution ratio of the input power distributed by the variable power distribution unit according to the determined size of the input power. Includes a variable control unit.

And the rectifier includes: a first rectifier whose input power value with maximum efficiency exceeds a certain amount; And it may include a second rectifier whose input power value with maximum efficiency is less than a certain level.

In addition, the variable power distribution unit includes an impedance conversion unit that changes load impedance according to an appropriate power distribution ratio determined by the impedance variable control unit; And it may include a power distribution unit that distributes the input power to the first rectifier and the second rectifier according to the load impedance.

And the impedance conversion unit includes: a first impedance conversion unit that changes the first impedance according to the appropriate power distribution ratio; and a second impedance converter that changes the second impedance according to the appropriate power distribution ratio.

Additionally, the first rectifier and the second rectifier may include a matching unit and a diode that matches impedance with the variable power distribution unit.

In addition, when the determined size of the input power exceeds a certain level, the impedance variable control unit may determine the appropriate power distribution ratio so that more of the input power is distributed to the first rectifier than to the second rectifier.

Additionally, if the determined input power is less than a certain level, the impedance variable control unit may determine the appropriate power distribution ratio so that more of the input power is distributed to the second rectifier than to the first rectifier.

Additionally, the impedance conversion unit may be provided as a switching circuit that switches between at least one impedance value.

Here, the impedance conversion unit includes a plurality of LC circuits having different load impedances; It may include a switch for switching between the plurality of LC circuits.

Meanwhile, the impedance conversion unit may include a variable capacitor.

In addition, the power distribution unit includes a first port connected to an antenna that receives the input power; When leakage power occurs, a second port is grounded or opened to prevent the leakage power from being reflected back to the first port to reflect the leakage power back to the first port; a third port connected to the first rectifier to distribute the input power to the first rectifier; And it may include a fourth port connected to the second rectifier to distribute the input power to the second rectifier.

Meanwhile, a wireless power reception method according to an embodiment of the present invention for achieving the above object includes the steps of a variable power distribution unit distributing input power; Rectifying the distributed input power by a rectifier; A power control unit converting the rectified power into DC power and transferring the DC power to a battery; And an impedance variable control unit determines the size of the input power by sensing the voltage change of the DC power delivered to the battery, and determines an appropriate power distribution ratio of the input power distributed in the distribution step according to the determined size of the input power. Includes decision-making steps.

And the rectifier includes a first rectifier whose input power value with maximum efficiency exceeds a certain amount and a second rectifier whose input power value with maximum efficiency is less than a certain amount, and the distributing step includes the appropriate power distribution ratio. changing the load impedance according to the appropriate power distribution ratio determined in the step of determining; and distributing the input power to the first rectifier and the second rectifier according to the load impedance.

In addition, changing the load impedance may include changing the first impedance according to the appropriate power distribution ratio; and changing the second impedance according to the appropriate power distribution ratio.

In the step of determining the appropriate power distribution ratio, if the determined size of the input power exceeds a certain size, the appropriate power distribution ratio may be determined so that more of the input power is distributed to the first rectifier than to the second rectifier. there is.

In addition, in the step of determining the appropriate power distribution ratio, if the determined size of the input power is less than a certain level, the appropriate power distribution ratio can be determined so that more of the input power is distributed to the second rectifier than to the first rectifier. .

According to one aspect of the present invention described above, by providing a wireless power reception device having multiple power modes, the appropriate distribution ratio for distributing input power can be varied according to the size of the input power, and the distribution is distributed according to the appropriate power distribution rate. High power conversion efficiency can be achieved by rectifying the input power with high efficiency.

1 is a diagram illustrating a wireless power reception device that controls a conventional matching network;
2 and 3 are block diagrams for explaining the configuration of a wireless power reception device according to an embodiment of the present invention;
Figure 4 is a circuit diagram of the wireless power receiving device of Figures 2 and 3;
5 is a diagram for explaining an impedance conversion unit according to another embodiment of the present invention;
6 is a flowchart illustrating a wireless power reception method according to an embodiment of the present invention;
7 is a graph showing the power distribution ratio in the wireless power reception device according to an embodiment of the present invention, and
Figure 8 is a graph showing power conversion efficiency in a wireless power reception device according to an embodiment of the present invention.

The detailed description of the present invention described below refers to the accompanying drawings, which show by way of example specific embodiments in which the present invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It should be understood that the various embodiments of the present invention are different from one another but are not necessarily mutually exclusive. For example, specific shapes, structures and characteristics described herein may be implemented in one embodiment without departing from the spirit and scope of the invention. Additionally, it should be understood that the location or arrangement of individual components within each disclosed embodiment may be changed without departing from the spirit and scope of the invention. Accordingly, the detailed description that follows is not intended to be taken in a limiting sense, and the scope of the invention is limited only by the appended claims, together with all equivalents to what those claims assert, if properly described. Similar reference numbers in the drawings refer to identical or similar functions across various aspects.

The components according to the present invention are components defined by functional division rather than physical division, and can be defined by the functions each performs. Each component may be implemented as hardware or program code and processing units that perform each function, and the functions of two or more components may be included and implemented in one component. Therefore, the names given to the components in the following embodiments are not intended to physically distinguish each component, but are given to suggest the representative function performed by each component, and the names of the components are used to describe the present invention. It should be noted that the technical idea is not limited.

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

Figures 2 and 3 are block diagrams for explaining the configuration of the wireless power reception device 10 according to an embodiment of the present invention.

As shown, the wireless power reception device 10 of the present invention may include a variable power distribution unit 100, a rectifier 200, a power control unit 300, and an impedance variable control unit 400.

In addition, the wireless power receiving device 10 may be installed and executed with software (application) for performing a wireless power receiving method, and includes a power distribution unit 110, a rectifier 200, a power control unit 300, and an impedance unit. The configuration of the variable control unit 400 may be controlled by software for performing a wireless power reception method.

The variable power distribution unit 100 distributes input power, which is power received from a wireless power transmitter, and may include an impedance conversion unit 120 and a power distribution unit 110.

The impedance converter 120 can change the load impedance according to the appropriate power distribution ratio determined by the impedance variable control unit 400, and for this purpose, it may include a first impedance converter 121 and a second impedance converter 122. You can.

The first impedance converter 121 may change the first impedance according to an appropriate power distribution ratio. This first impedance conversion unit 121 may be controlled by the first impedance variable control unit 410 of the impedance variable control unit 400.

The second impedance converter 122 may convert the second impedance according to an appropriate power distribution ratio. This second impedance conversion unit 122 may be controlled by the second impedance variable control unit 420 of the impedance variable control unit 400.

Accordingly, each of the first impedance converter 121 and the second impedance converter 122 may participate in the input power distributed to the first rectifier 210 and the second rectifier 220.

Meanwhile, the power distribution unit 110 may distribute input power to the first rectifier 210 and the second rectifier 220 according to the load impedance that changes in the impedance conversion unit 120. And the power distribution unit 110 may be provided as a 4-port power divider.

Accordingly, the first port 111 may be connected to an antenna that receives input power.

When leakage power occurs, the second port 112 may be grounded or opened to prevent leakage power from being reflected back to the first port 111 to reflect the leakage power back to the first port 111 .

Meanwhile, the third port 113 is connected to the first rectifier 210 to distribute input power to the first rectifier 210.

And the fourth port 114 is connected to the second rectifier 220 to distribute input power to the second rectifier 220.

Additionally, the 4-port distributor of the power distribution unit 110 may be provided in a single stage, or may be provided as two 4-port distributors and connected in a 2-stage form. The power distribution unit 110 will be described in more detail in FIG. 4.

Meanwhile, the rectifier 200 is for rectifying the power distributed by the variable power distribution unit 100 and may include a first rectifier 210 and a second rectifier 220.

The first rectifier 210 may be provided including a rectifier whose input power value with maximum efficiency exceeds a certain level. That is, the first rectifier 210 may be provided for a high-power mode with higher efficiency than the second rectifier 220 when the input power is high power exceeding a certain level.

Meanwhile, the second rectifier 220 may be provided including a rectifier whose input power value with maximum efficiency is less than a certain level. That is, the second rectifier 220 may be provided for a low-power mode with higher efficiency than the first rectifier 210 when the input power is less than a certain level.

The first rectifier 210 and the second rectifier 220 may include a matching unit for matching impedance with the variable power distribution unit 100 and a diode as a rectifier.

Meanwhile, the power control unit 300 may convert the power rectified in the rectifier 200 into DC power and transfer the DC power to the battery B. This power control unit 300 may be provided to include a DC filter unit, a DC power conversion unit, and a load resistance unit, and the load may be connected to the battery (B).

In addition, the power control unit 300 changes the voltage magnitude of the DC power applied to the load resistor depending on the input power, and in order to enable the impedance variable control unit 400 to determine the voltage change of this DC power, an impedance variable control unit ( 400).

The impedance variable control unit 400 can determine the size of the input power by sensing the voltage change of the DC power delivered to the battery (B). Additionally, the impedance variable control unit 400 may determine a static power distribution ratio of the input power distributed by the variable power distribution unit 100 according to the determined size of the input power.

For this purpose, the impedance variable control unit 400 includes a first impedance variable control unit 410 that controls the first impedance conversion unit 121 and a second impedance variable control unit 420 that controls the second impedance conversion unit 122. can do.

And, when the size of the determined input power exceeds a certain level, the impedance variable control unit 400 may determine an appropriate power distribution ratio so that more of the input power is distributed to the first rectifier 210 than to the second rectifier 220. .

In addition, the impedance variable control unit 400 may determine an appropriate power distribution ratio so that more of the input power is distributed to the second rectifier 220 than to the first rectifier 210 when the size of the determined input power is less than a certain level.

Therefore, through the impedance variable control unit 400, the wireless power reception device 10 of the present invention can variably determine the appropriate power distribution ratio according to the determined size of the input power. Through this, according to the appropriate power distribution ratio, when the input power is high power, more input power can be distributed to the first rectifier 210, which has maximum efficiency at high power, and when the input power is low power, it can have maximum efficiency at low power. More input power can be distributed to the second rectifier 220.

Specifically, the input power that serves as a standard for distinguishing between a high-power mode in which more input power is distributed to the first rectifier 210 and a low-power mode in which more input power is distributed to the second rectifier 220 is shown in FIG. 8, which will be described later. As shown, the case of 20dBm can be used as a standard.

That is, if the determined input power is less than 20 dBm, the impedance variable control unit 400 determines an appropriate power distribution ratio so that more input power is distributed to the second rectifier 220 in the low power mode.

Meanwhile, if the determined input power exceeds 20 dBm, an appropriate power distribution ratio can be determined so that more input power is distributed to the first rectifier 210 in high power mode.

If the determined input power is 20 dBm, the impedance variable control unit 400 can determine an appropriate power distribution ratio so that the input power distributed to the first rectifier 210 and the second rectifier 220 is the same.

In addition, the wireless power receiving device 10 according to the present invention does not allow the input power to be rectified in only one of the first rectifier 210 and the second rectifier 220 when high power or low power is received as the input power. .

That is, the input power is distributed to the first rectifier 210 and the second rectifier 220 according to an appropriate power distribution ratio, so that the first rectifier 210 and the second rectifier 220 each rectify the simultaneously distributed input power. You can.

Therefore, by rectifying the distributed input power in each rectifier 200 based on the determined appropriate power distribution ratio, high power conversion efficiency can always be maintained in a wide input power range.

The reference input power value, which is the standard for dividing high power and low power, is an example for convenience of explanation and can of course be changed at any time.

When the wireless power receiving device 10 receives input power for the first time, the impedance converter 120 changes the load impedance according to a preset arbitrary ratio to distribute the input power.

And after the impedance variable control unit 400 determines the input power, the input power can be distributed according to the appropriate power ratio determined by the impedance variable control unit 400.

Accordingly, as shown in the graph shown in FIG. 3, when the input power is large, the wireless power receiving device 10 of the present invention increases the ratio of power distributed to the first rectifier 210, which is a high power mode rectifier, to distribute most of the input power. is rectified in the first rectifier 210 to achieve high efficiency.

Conversely, when the input power is small, the ratio of power distributed to the second rectifier 210 in the low power mode is increased to rectify most of the input power in the second rectifier 210 to achieve high efficiency.

That is, since the low-power mode rectifier and the high-power mode rectifier have different input power ranges in which high efficiency can be achieved, the present wireless power receiving device 10 can always operate within the optimal input power range of each rectifier 210 and 220. Can appropriately determine the power to be sent to each rectifier (210, 220).

And through this, as shown in the graph shown at the rear of the power control unit 300 in FIG. 3, high power conversion efficiency can always be maintained in a wide input power range through an optimal power distribution ratio.

Meanwhile, FIG. 4 is a circuit diagram of the wireless power reception device 10 of FIGS. 2 and 3.

First, the impedance conversion unit 120 including the first impedance conversion unit 121 and the second impedance conversion unit 122 may be provided as a switching circuit that switches between at least one impedance value.

Specifically, the impedance converter 120 may be provided to include a plurality of LC circuits having different load impedances and a switch for switching between the plurality of LC circuits.

At this time, the switch can be provided as a Single-Pole n-Throw (SPnT) switch based on a digital control signal. In FIG. 4, the switch is shown as being provided as a single-pole double-throw (SPDT), but this is only an example for convenience of explanation and is not limited thereto.

Meanwhile, the power distribution unit 110 is provided as a 4-port power distributor including the first port 111, the second port 112, the third port 113, and the fourth port 114, as described above. 4 shows a case of a two-stage branch line combiner equipped with two 4-port power distributors.

Below, for convenience of explanation, among the plurality of 4-port power dividers, the divider provided on the side connected to the antenna will be described as a first-stage power divider, and the divider provided on the grounded or open side will be described as a second-stage power divider. Let me explain.

The power distribution unit 110, which consists of a two-stage branch line combiner, includes a first transmission line ( ), second transmission line ( ) and the third transmission line ( ) may include.

Among these plurality of transmission lines, the first transmission line ( ) and the second transmission line ( ) can be provided in each of the first-stage power distributor and the second-stage power distributor.

1st transmission line ( ) and the second transmission line ( ) can allow the first port 111, second port 112, third port 113, and fourth port 114 of each power distributor to be connected to each other.

Specifically, the first transmission line ( ) can be provided as a pair. A pair of first transmission lines ( ) of one of the first transmission lines ( ) may be provided between the first port 111 and the second port 112 so that the first port 111 and the second port 112 are connected to each other.

And the remaining first transmission line ( ) may be provided between the third port 113 and the fourth port 114 so that the third port 113 and the fourth port 114 are connected to each other. This pair of first transmission lines ( ) can be provided in positions facing each other.

Meanwhile, the second transmission line ( ) can be provided as a pair. A pair of secondary transmission lines ( ) of one of the second transmission lines ( ) is the first port 111 and the first transmission line ( ) and the third port 113 and the first transmission line ( ) can be provided between the contact points.

And the remaining second transmission line ( ) is the second port 112 and the first transmission line ( ) and the fourth port 114 and the first transmission line ( ) can be provided between the contact points. This pair of second transmission lines () may be provided in positions facing each other.

And the third transmission line ( ) are also provided in pairs. At this time, one third transmission line ( ) may allow the second port of the first-stage power distributor to be connected to the first port of the second-stage power distributor.

The remaining third transmission line ( ) can allow the fourth port of the first-stage power distributor to be connected to the third port of the second-stage power distributor.

This 4-port power divider, which constitutes the power distribution unit 110, is not only prepared by using a branch line coupler for the 4 output ports as described above, but also is equipped with various devices that can distribute input power, such as a 3-dB directional coupler. It can be prepared using a device. It can also be configured using lumped elements that can increase space saving.

Meanwhile, the rectifier 200 may include a matching unit and a diode to match the variable power distribution unit 100 and impedance.

As shown in the drawing, the matching unit may be composed of a matching network including transmission lines (W, L) and a capacitor (C), and the diode (D) may be configured in the form of a voltage multiplier.

More specifically, the matching part of the first rectifying part 210 is connected to the fourth transmission line ( ), 5th transmission line ( ), 6th transmission line ( ) and a capacitor (C), and a fourth transmission line ( ) side may be connected to the third port 113 of the power distribution unit 110.

And the matching part of the second rectifier 220 is connected to the seventh transmission line ( ) and a capacitor (CBLK), and a seventh transmission line ( ) side may be connected to the fourth port 114 of the power distribution unit 110.

Meanwhile, the DC filter part of the power control unit 300 can be configured using a parallel capacitor and a series inductor, and the battery input part can be designed by replacing it with a load resistor.

Figure 5 is a diagram for explaining the impedance converter 120 according to another embodiment of the present invention. The impedance converter 120 according to another embodiment may include a variable capacitor.

A variable capacitor is a device whose capacitance changes depending on a control signal, and a junction varactor or a metal oxide semiconductor (MOS) varactor may be used, but the variable capacitor is not limited thereto.

Through this, the impedance converter 120 can change the capacitance of the variable capacitor according to the analog control signal. This makes it possible to continuously select an appropriate power distribution ratio over a very wide range.

Meanwhile, Figure 7 is a graph showing the power distribution ratio in the wireless power reception device 10 according to an embodiment of the present invention, and Figure 8 is a graph showing the power distribution ratio in the wireless power reception device 10 according to an embodiment of the present invention. This is a graph showing the power conversion efficiency of .

When the impedance seen in the direction of the impedance conversion unit 120 is referred to as the load impedance, the range of the load impedance should ideally have only the imaginary impedance.

Accordingly, the range of the imaginary impedance value of the impedance conversion unit 120 must be convertible from 0 to infinity.

FIG. 7 shows that in the wireless power receiving device 10 designed according to the circuit shown in FIG. 5, the impedance converter 120 changes the load impedance ( ) is a graph showing the power distribution ratio in the third port 113 and the fourth port 114 of the power distribution unit 110 that varies as .

And on the graph of FIG. 7, S(3,1) is the case of distributing input power from the first port 111 of the power distribution unit 110 to the third port 113, and S(4,1) is the power This is a case of distributing input power from the first port 111 of the distribution unit 110 to the fourth port 114.

As can be seen from the graph, when the impedance converter 120 has a load impedance of 0 ohm according to the determined appropriate power distribution ratio, most of the input power is connected to the fourth rectifier 220 for low power mode. While it is distributed to the port 114, when the load impedance is infinite, most of the power is distributed to the third port 113 connected to the first rectifier 210 for high power mode.

In particular, it can be seen that the input power is distributed exactly 1/2 when the impedance converter 120 has a load impedance of j25 ohms.

And Figure 8 shows the power conversion efficiency (PCE) of the wireless power receiving device 10 according to the present invention, which is the result of a simulation to prove the effect of the wireless power receiving device 10 according to the present invention. It's a graph.

Conventionally, the input power range with a PCE of 50% or more has a 17dB range from 5dBm to 22dBm.

However, as shown in the figure, the wireless power receiving device 10 according to the present invention was confirmed to have a wide input power range of 25 dB with a PCE of 50% or more from 5 dBm to 30 dBm as a result of simulation.

Through this, the effectiveness of the wireless power reception device 10 of the present invention can be confirmed.

FIG. 6 is a flowchart for explaining a method of receiving power wirelessly according to an embodiment of the present invention. The method of receiving power wirelessly according to an embodiment of the present invention includes the wireless power receiving device 10 shown in FIGS. 2 to 5. Since it is carried out on substantially the same configuration as that of the wireless power receiving device 10 of FIGS. 2 to 5, the same reference numerals are assigned to the same components, and repeated descriptions are omitted.

The wireless power reception method of the present invention includes a distribution step (S110), a rectification step (S130), a transfer step to the battery (S150), a step of determining the size of the input power (S170), and a step of determining an appropriate power distribution ratio. It may include step S190.

And the above distributing step (S110), rectifying step (S130), transferring to the battery (S150), determining the size of the input power (S170), and determining the appropriate power distribution ratio (S190) are the input power This can be done repeatedly until it is not received.

In the distribution step (S110), the variable power distribution unit 100 may distribute the input power. At this time, if the input power received by the variable power distribution unit 100 is the first input power received, the variable power distribution unit 100 may distribute the input power according to a distribution ratio arbitrarily set in advance.

And the distribution step (S110) may include a step in which the impedance converter 120 changes the load impedance according to the appropriate power distribution ratio determined in the step (S190) of determining the appropriate power distribution ratio.

This step of changing the load impedance includes the steps of the first impedance converter 121 changing the first impedance according to the appropriate power distribution ratio and the second impedance converter 122 changing the second impedance according to the appropriate power distribution ratio. May include steps.

Additionally, the distribution step (S110) may include the power distribution unit 110 distributing the input power to the first rectifier 210 and the second rectifier 220 according to the load impedance.

Meanwhile, in the rectifying step (S130), the rectifier 200 can rectify the distributed input power. At this time, the rectifier 200 may be provided including a first rectifier 210 whose input power value with maximum efficiency exceeds a certain amount and a second rectifier 220 whose input power value with maximum efficiency is less than a certain amount. .

In the step of transferring to the battery (S150), the power control unit 300 may convert the rectified power into DC power and transfer the DC power to the battery (B).

Meanwhile, in the step of determining the size of the input power (S170), the impedance variable control unit 400 can determine the size of the input power by sensing the voltage change of the DC power delivered to the battery (B).

And in the step of determining the appropriate power distribution ratio (S190), the appropriate power distribution ratio of the input power distributed in the distribution step (S110) can be determined according to the size of the input power determined by the impedance variable control unit 400.

In the step of determining the appropriate power distribution ratio (S190), if the size of the determined input power exceeds a certain size, the impedance variable control unit 400 directs the input power more to the first rectifier 210 than to the second rectifier 220. An appropriate power distribution ratio can be determined so that a large amount of power is distributed.

In addition, in the step of determining the appropriate power distribution ratio (S190), if the size of the determined input power is less than a certain size, the impedance variable control unit 400 directs the input power to the second rectifier 220 more than the first rectifier 210. An appropriate power distribution ratio can be determined so that a large amount of power is distributed.

The wireless power reception method of the present invention can be implemented in the form of program instructions that can be executed through various computer components and recorded on a computer-readable recording medium. The computer-readable recording medium may include program instructions, data files, data structures, etc., singly or in combination.

The program instructions recorded on the computer-readable recording medium may be specially designed and configured for the present invention or may be known and usable by those skilled in the computer software field.

Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks and magnetic tapes, optical recording media such as CD-ROMs and DVDs, and magneto-optical media such as floptical disks. media), and hardware devices specifically configured to store and perform program instructions, such as ROM, RAM, flash memory, etc.

Examples of program instructions include not only machine language code such as that created by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like. The hardware device may be configured to operate as one or more software modules to perform processing according to the invention and vice versa.

Although various embodiments of the present invention have been shown and described above, the present invention is not limited to the specific embodiments described above, and may be used in the technical field to which the invention pertains without departing from the gist of the invention as claimed in the claims. Of course, various modifications can be made by those skilled in the art, and these modifications should not be understood individually from the technical idea or perspective of the present invention.

10: wireless power receiving device 100: variable power distribution unit
110: power distribution unit 120: impedance conversion unit
200: rectifier 300: power control unit
400: Impedance variable control unit B: Battery

Claims (16)

A variable power distribution unit that distributes input power;
a rectifier that rectifies the input power distributed by the variable power distribution unit;
a power control unit that converts the power rectified in the rectifier into DC power and transfers the DC power to a battery; and
An impedance variable that senses the voltage change of the DC power delivered to the battery to determine the size of the input power, and determines an appropriate power distribution ratio of the input power distributed by the variable power distribution unit according to the determined size of the input power. Includes a control unit,
The rectifier unit,
A first rectifier whose input power value with maximum efficiency exceeds a certain amount; and
It includes a second rectifier whose input power value with maximum efficiency is less than a certain amount,
The variable power distribution unit,
an impedance conversion unit that changes load impedance according to an appropriate power distribution ratio determined by the impedance variable control unit; and
A power distribution unit that distributes the input power to the first rectifier and the second rectifier according to the load impedance,
The power distribution unit,
a first port connected to an antenna that receives the input power;
When leakage power occurs, a second port is grounded or opened to prevent the leakage power from being reflected back to the first port to reflect the leakage power back to the first port;
a third port connected to the first rectifier to distribute the input power to the first rectifier; and
A wireless power receiving device having multiple power modes including a fourth port connected to the second rectifier to distribute the input power to the second rectifier. delete delete According to paragraph 1,
The impedance conversion unit,
a first impedance converter that changes the first impedance according to the appropriate power distribution ratio; and
A wireless power reception device having multiple power modes, comprising a second impedance converter that changes the second impedance according to the appropriate power distribution ratio. According to clause 4,
The first rectifier and the second rectifier,
A wireless power reception device with multiple power modes, comprising a matching unit and a diode that matches the variable power distribution unit and impedance. According to paragraph 1,
The impedance variable control unit,
When the size of the determined input power exceeds a certain level, the appropriate power distribution ratio is determined so that the input power is distributed more to the first rectifier than to the second rectifier. Receiving device. According to paragraph 1,
The impedance variable control unit,
If the size of the determined input power is less than a certain level, the appropriate power distribution ratio is determined so that the input power is distributed more to the second rectifier than to the first rectifier. Device. According to paragraph 1,
The impedance conversion unit,
A wireless power reception device having multiple power modes, characterized in that it is provided with a switching circuit that switches between at least one impedance value. According to clause 8,
The impedance conversion unit,
A plurality of LC circuits having different load impedances; and
A wireless power reception device having multiple power modes, comprising a switch for switching between the plurality of LC circuits. According to paragraph 1,
The impedance conversion unit,
A wireless power reception device having multiple power modes, comprising a variable capacitor. delete A variable power distribution unit distributing input power;
Rectifying the distributed input power by a rectifier;
A power control unit converting the rectified power into DC power and transferring the DC power to a battery; and
The impedance variable control unit determines the size of the input power by sensing the voltage change of the DC power delivered to the battery, and determines an appropriate power distribution ratio of the input power distributed in the distribution step according to the size of the determined input power. Including the steps of:
The rectifier unit,
It includes a first rectifier whose input power value with maximum efficiency exceeds a certain amount and a second rectifier whose input power value with maximum efficiency is less than a certain amount,
The distributing step is,
changing the load impedance by an impedance converter according to the appropriate power distribution ratio determined in the step of determining the appropriate power distribution ratio; and
A power distribution unit distributing the input power to the first rectifier and the second rectifier according to the load impedance,
The power distribution unit,
a first port connected to an antenna that receives the input power;
When leakage power occurs, a second port is grounded or opened to prevent the leakage power from being reflected back to the first port to reflect the leakage power back to the first port;
a third port connected to the first rectifier to distribute the input power to the first rectifier; and
A method of receiving wireless power including a fourth port connected to the second rectifier to distribute the input power to the second rectifier. delete According to clause 12,
The step of changing the load impedance is,
changing, by a first impedance converter among the impedance converters, a first impedance according to the appropriate power distribution ratio; and
A method of receiving wireless power, characterized in that it includes the step of changing the second impedance in a second impedance conversion unit among the impedance conversion units according to the appropriate power distribution ratio. According to clause 12,
In the step of determining the appropriate power distribution ratio,
When the size of the determined input power exceeds a certain level, the appropriate power distribution ratio is determined so that more of the input power is distributed to the first rectifier than to the second rectifier. According to clause 12,
In the step of determining the appropriate power distribution ratio,
If the size of the determined input power is less than a certain level, the appropriate power distribution ratio is determined so that more of the input power is distributed to the second rectifier than to the first rectifier.