WO2013118954A1

WO2013118954A1 - Wireless power-transmitting apparatus

Info

Publication number: WO2013118954A1
Application number: PCT/KR2012/007735
Authority: WO
Inventors: 홍성철; 안덕주
Original assignee: 한국과학기술원
Priority date: 2012-02-07
Filing date: 2012-09-26
Publication date: 2013-08-15
Also published as: KR20130091003A; KR101302024B1

Abstract

The present invention relates to a wireless power-transmitting apparatus, comprising: an AC driver; a transmitting resonator consisting of a matching network and a transmitting coil so as to transmit power received from the AC driver; a receiving resonator consisting of a receiving coil and a matching network so as to receive power transmitted by the transmitting resonator; a rod for receiving the power received at the receiving resonator; and a plurality of coupling extending resonators interposed between the transmitting resonator and the receiving resonator. The coupling extending resonators can be biased toward one side relative to the center between the transmitting resonator and the receiving resonator.

Description

Wireless power transmitter

The present invention relates to a wireless power transmission apparatus, and more particularly, to a wireless power transmission apparatus for adjusting each frequency according to the coupling coefficient when the position of the coupling expansion resonator is biased to one side.

Recently, the miniaturization and portability of electronic products including home appliances have been rapidly progressing. In addition, since all information and signals are wirelessly processed, wires connected to the device are almost lost. In the case of home appliances, attempts have also been made to wirelessly transmit power. Electromagnetic induction is most commonly used as a method of transmitting power wirelessly. Specifically, wireless power transmission using electromagnetic induction is used in electric toothbrushes and the like. However, even if the distance is a little, the transmission efficiency is too low and there is a problem that can cause unnecessary and dangerous heat generation due to eddy currents.

The magnetic resonance wireless power transfer method, which is a non-radiative energy transfer technology, which has been recently studied, can obtain a high transmission efficiency even at a distance of several meters farther than the conventional electromagnetic induction method. This technique is based on attenuation wave coupling, where electromagnetic waves travel from one medium to another through the near field when two media resonate at the same frequency, and energy is transferred only when the resonant frequencies between the two media are the same. Unused energy is then absorbed back into the electromagnetic field. Therefore, unlike other electromagnetic waves, it is harmless to the surrounding machinery or human body.

The magnetic resonance wireless power transmission system includes one resonator that causes resonance at a transmission frequency at a transmitter and a receiver. A high efficiency transmission is possible when the resonance frequencies of the two resonators are exactly the same. When the actual system is configured, since the resonant frequencies of the two resonators are slightly different, a variable capacitor capable of adjusting the resonant frequency may be included in the transmitter or the receiver to adjust this. At this time, since a very large voltage is generated at both ends of the coil, the breakdown voltage of the capacitor should be very large. In addition, the impedance matching of the transmitter and the receiver is essential at the transmission frequency, and the distance between the transmission coil and the power coil and the distance between the reception coil and the load coil must be properly adjusted according to the transmission distance.

In addition, power transmission to various devices is a complicated situation. In general, when the distance between the power transmitter and the device is irregular, and the number of devices is placed at the same time, the impedance matching is broken when several devices are placed at the same time, there is a problem that the power is not transmitted.

An object of the present invention for solving the above problems is to provide a wireless power transmission device that transmits power wirelessly to one or more electronic devices over a long distance, the performance does not drop by matching the effective resonant frequency.

Wireless power transmission apparatus of the present invention for achieving the above object, AC driver;

A transmission resonator comprising a matching network and a transmission coil to transmit power received from the AC driver; A reception resonator comprising a reception coil and a matching network to receive power transmitted from the transmission resonator; A load receiving power received by the receiving resonator; And a plurality of coupling expansion resonators located between the transmission / reception resonators, wherein the coupling expansion resonators may be formed to be biased toward one of the centers of the transmission / reception resonators. It is characterized by.

In addition, another wireless power transmission device of the present invention, the AC driver; A transmission resonator comprising a matching network and a transmission coil to transmit power received from the AC driver; A reception resonator comprising a reception coil and a matching network to receive power transmitted from the transmission resonator; A load receiving power received by the receiving resonator; And a plurality of coupling expansion resonators located at the side or the rear of one or all of the transmitter / receiver resonators.

The coupling expansion resonator is characterized in that formed in the range of 1 to 8.

When the coupling expansion resonator is configured between the transmission and reception resonators, the effective resonant frequency according to the coupling between the coupling expansion resonator and the transmission resonator positioned close to the transmission resonator (center reference) may be a driving frequency or It is characterized in that it is set to one or more frequencies of the effective resonant frequency according to the coupling of the coupling expansion resonator and the receiving resonator located close to the receiving resonator (center reference).

When the coupling expansion resonator is configured to be biased toward one of the centers between the transmission and reception resonators, an effective resonance frequency according to the coupling between the coupling expansion resonator and the biased resonator is driven. Or to adjust any one or more frequencies of the resonant frequencies of the opposite resonator.

When the coupling expansion resonator is located on the side or the rear of both the transmitting and receiving resonators, the effective resonant frequency according to the coupling between the coupling expansion resonator and the transmitting resonator located close to the transmitting resonator is driven or received. It is characterized in that it is adjusted to any one or more frequencies of the effective resonant frequency according to the coupling of the coupling expansion resonator and the receiving resonator located close to the side.

When the coupling expansion resonator is located at the side or the rear of either of the transmitting and receiving resonators, the effective resonant frequency according to the coupling of the coupling expansion resonator and the adjacent resonator is driven or reversed. It is characterized in that the frequency of any one or more of the resonant frequency of the resonator.

In addition, another wireless power transmission device of the present invention, the AC driver; A transmission resonator comprising a matching network and a transmission coil to transmit power received from the AC driver; A reception resonator comprising a reception coil and a matching network to receive power transmitted from the transmission resonator; A load receiving power received by the receiving resonator; And a plurality of individual coils connected to one or all of the transmitter / receiver resonators in parallel with the transmitter / receive coils.

The individual coil is characterized in that it is configured in the range of 1 to 8.

When the individual coil is configured in one of a transmitting resonator or a receiving resonator, the effective resonant frequency according to the coupling of the resonator where the individual coil and the individual coil are located is a driving frequency or a place where the individual coil is not configured. It is characterized by adjusting to any one or more of the resonant frequencies.

When the individual coil is configured in both the transmitting and receiving resonator, the effective resonant frequency according to the coupling of the individual coil and the transmitting resonator of the transmitting resonator is the driving frequency or the effective resonant frequency according to the coupling of the receiving coil and the individual coil of the receiving resonator. It is characterized by adjusting to any one or more of the frequencies.

The wireless power transmission apparatus according to the present invention transmits power wirelessly to one or more electronic devices over a long distance, and there is an effect that the performance of the effective resonant frequency is not degraded even if the position of the coupling extension resonator is arbitrarily arranged. .

1 is a wireless power transmission apparatus according to an embodiment of the present invention.

2 is a wireless power transmission apparatus according to another embodiment of the present invention.

3 is a wireless power transmission apparatus according to another embodiment of the present invention.

4 shows the position of the effective resonant frequency when the transmitting resonator of the present invention and the additional coupling expansion resonator are combined.

5 is a graph showing the power transfer amount when the position of the coupling expansion resonator of the present invention is changed.

6A and 6B show the relative positions of the frequencies after using the proposed frequency adjustment method when the additional coupling expansion resonator of the present invention is in a biased position.

7 is a resonator including individual coils connected in parallel according to another embodiment of the present invention.

8 is a resonator including individual coils connected in parallel according to another embodiment of the present invention.

9 is a view showing an increase in reflected admittance when using a resonator including individual coils connected in parallel according to the present invention.

FIG. 10 is a diagram showing an increase in power transfer efficiency when a resonator including individual coils connected in parallel according to the present invention is used.

11 is a diagram showing an increase in power transfer amount when a resonator including individual coils connected in parallel according to the present invention is used.

Hereinafter, a wireless power transmitter of the present invention will be described in detail with reference to the accompanying drawings.

Referring to FIGS. 1 and 2, the wireless power transmitter includes an AC driver, a transmission resonator 100, a reception resonator 200, a rod, and a plurality of coupling expansion resonators 300a.

The transmission resonator 100 is configured to be connected to the AC driver, consisting of a matching network 110, a transmission coil 120 to transmit power.

The receiving resonator 200 is configured to be connected to a load, and comprises a receiving coil 210 and a matching network 220 to receive the power transmitted from the transmitting resonator 100.

The coupling expansion resonator (300a) is formed in the range of 1 to 8 between the receiving resonators (100, 200), any one based on the center between the transmission and reception resonators (100, 200) It is possible to form toward the side.

Referring to FIG. 1, when the coupling expansion resonator 300a is configured to be close to the transmission resonator 100 based on the center between the transmission and

reception resonators

100 and 200, the coupling expansion resonator 300a may be used. ) And the effective resonant frequency according to the coupling of the transmitting resonator 100 to any one or more frequencies of the driving frequency or the resonant frequency of the receiving resonator 200.

Referring to FIG. 2, when the coupling expansion resonator 300a is configured to be close to the reception resonator 200 based on the center between the transmission /

reception resonators

100 and 200, the coupling expansion resonator 300a may be used. ) And the effective resonant frequency according to the coupling of the receiving resonator 200 to any one or more frequencies of the driving frequency or the resonant frequency of the transmitting resonator 100.

Referring to FIG. 3, another wireless power transmitter of the present invention includes an AC driver, a transmission resonator 100, a reception resonator 200, a rod, and a plurality of coupling expansion resonators 300a.

The coupling expansion resonator 300a may be formed within one to eight ranges on one or all sides or rear surfaces of the transmission /

reception resonators

100 and 200.

Here, when the coupling expansion resonator 300a is formed on the side as shown in FIG. 3, the coupling expansion resonator 300a is disposed on the same plane as the transmission /

reception resonators

100 and 200, or has a larger circumference than the transmission /

reception resonators

100 and 200. It can be formed in the form of having a shape surrounding the periphery.

When the coupling expansion resonator 300a is located at the side or the rear of both the transmission and

reception resonators

100 and 200, the coupling expansion resonator 300a and the transmission resonator are located close to the transmission resonator 100. At least one of the effective resonant frequency according to the coupling of the coupling expansion resonator 300a and the receiving resonator 200, the effective resonant frequency according to the coupling of (100) is located close to the driving frequency or the receiving resonator 200 side Set to frequency

In addition, when the coupling expansion resonator 300a is located at the side or the rear of either of the transmission /

reception resonators

100 and 200, the coupling expansion resonator 300a is coupled to the coupling of the resonator close to the coupling expansion resonator 300a. The effective resonant frequency is set to one or more of the driving frequency or the resonant frequency of the opposite resonator.

Referring to Figure 4, it shows the relative position of each frequency after the effective resonant frequency changes, the magnetic coupling coefficient between the transmission resonator 100 and the coupling expansion resonator 300a is kTX and the two resonance frequencies Is equal to w0, the system of the transmission resonator 100 and the coupling expansion resonator 300a is as follows.

The result is two resonance frequencies

Is obtained.

Among them, the current phase is the same

Is the effective resonant frequency of the transmission resonator 100 and the coupling expansion resonator 300a.

Here, the degradation of performance is because the effective resonant frequency does not coincide with the driving frequency or the resonant frequency of the receiving resonator 200, or the effective resonant frequency does not coincide with the driving frequency and the resonant frequency of the receiving resonator 200. It happens.

Referring to Figure 5, (A) through the curve can be confirmed the performance degradation due to the change in position.

Therefore, for the proper operation of the coupling expansion resonator 300a, the effective resonant frequency and other frequencies must match.

For example, firstly, the effective resonant frequency

It is possible to adjust the driving frequency or the resonance frequency of the receiving resonator 200 according to the.

Second, the original resonant frequency of each of the transmission resonator 100 and the coupling expansion resonator 300a

It is possible to raise by.

In the second case, the effective resonant frequency is

There is no change of effective resonance frequency. That is, instead of adjusting the resonant frequencies of the transmitting resonator 100 and the coupling expansion resonator 300a, the driving frequency or the resonant frequency of the receiving resonator 200 may be fixed.

6A and 6B, the relative positions of the frequencies when using the proposed frequency adjustment method can be identified.

As a result, even if the position of the coupling expansion resonator 300a is arbitrarily changed as shown in the graph (B) of FIG. 5, a substantially constant power transfer amount can be obtained.

If the resonant frequencies of the transmitting resonator 100 and the coupling expansion resonator 300a are different from each other, the large principle of matching the effective resonant frequencies of the two with other frequencies does not change. However, if the two resonant frequencies are different, the effective resonant frequency will have a different value. When the inductance and capacitance of the transmission resonator 100 are L1, C1, and the inductance and capacitance of the coupling expansion resonator 300a are L2 and C2, and the product of L1C1 and L2C2 are different, the effective resonance frequency according to the coupling Is calculated as follows.

Therefore, any one or more frequencies of the above frequency and the resonant frequency or driving frequency of the receiving resonator 200 are adjusted.

When the number of coupling expansion resonators 300a biased toward the transmission resonator 100 is two or more, or when the coupling expansion resonators 300a are biased toward the reception resonator 200, or a plurality of coupling expansion resonators 300a. Although 300a is present in both the transmitting resonator 100 and the receiving resonator 200, the fact that the respective effective resonant frequencies and the driving frequency must match does not change.

Conventional wireless power transmission and reception resonators have included only one transmission /

reception coil

120 and 210 in one resonator. However, when the capacitor is connected in parallel with the coil and resonates in parallel, the reflected admittance seen by the AC driver may be increased by using the transmitter /

receiver resonators

100 and 200 including the individual coils 300b connected in parallel. . The larger the admittance seen by the AC driver, the greater the power delivery.

7, 8, another wireless power transmission apparatus of the present invention is composed of an AC driver, a transmission resonator 100, a receiving resonator 200, a load and an individual coil (300b).

The transmission resonator 100 is configured to be connected to the AC driver, consisting of a matching network 110, the transmission coil 120 to transmit power.

The receiving resonator 200 is connected to the load, and consists of a receiving coil 210 and a matching network 220 to receive the power transmitted from the transmitting resonator 100.

The individual coil 300b is configured to be connected in parallel with the transmission / reception coils 120 and 210 at one or all of the transmission /

reception resonators

100 and 200.

Here, the individual coil (300b) is configured in the range of 1 to 8, when the individual coil (300b) is located in the transmission resonator 100 is connected in parallel with the transmission coil 120, the individual coil (300b) When located in the receiving resonator 200 is connected in parallel with the receiving coil (210).

Referring to FIG. 7, when the individual coil 300b is located in the transmission resonator 100 and connected in parallel with the transmission coil 120, an effective resonance frequency according to the coupling of the individual coil 300b and the transmission resonator 100 is provided. To any one or more frequencies of the driving frequency or the resonance frequency of the receiving resonator 200.

Referring to FIG. 8, when the individual coil 300b is located in the receiving resonator 200 and connected in parallel with the receiving coil 210, an effective resonance frequency according to the coupling of the individual coil 300b and the receiving resonator 200 is provided. To any one or more frequencies of the driving frequency or the resonant frequency of the transmission resonator 100.

In addition, when the individual coil (300b) is located in both the transmission / reception resonator (100, 200) and connected in parallel with the transmission / reception coil (120, 210), the individual coil connected to the transmission coil (120) ( 300b) the effective resonant frequency according to the coupling of the transmission resonator 100 and the drive frequency or the effective resonant frequency according to the coupling of the individual coil (300b) and the receiving resonator 200 configured to be connected to the receiving coil 210 Set to one or more frequencies.

Here, the resonant frequencies of the transmitter /

receiver resonators

100 and 200 including the individual coils 300b connected in parallel are determined as follows.

For example, when there is one individual coil (300b), in the transmission / reception resonators (100, 200) including the individual coil (300b) connected in parallel, one individual coil (300b) and one transmission / reception coil (120, 210) When the inductance is L and the capacitance is C and the coupling coefficients between the individual coils 300b and the transmit / receive

coils

120 and 210 are kCOIL, the individual coils 300b and the transmit / receive coils 120 and 210 ) One effective inductance

To increase. This is because the transmission / reception coils 120 and 210 and the individual coils 300b are coupled while current flows in the same direction.

Since the inductance of the transistor exists in parallel, the effective inductance of the entire transmitter / receiver resonator (100, 200)

Becomes Therefore, the effective resonant frequency of the entire transmission and reception resonator (100, 200)

Becomes

Match other frequencies to this effective resonant frequency (e.g., the resonant frequency of the other resonator or the drive frequency).

As another method, there may be a method of fixing the resonant frequency or driving frequency of the other resonator on the opposite side and adjusting the effective resonant frequency of the side resonator including the individual coils 300b connected in parallel.

For example, consider a resonator that includes coils connected in parallel. In this case, capacitor C

Adjust with Then the effective resonant frequency of the entire resonator is

Is kept constant. Therefore, it is not necessary to adjust other frequencies (opposite resonant frequency or driving frequency). In this case, the equivalent circuit of the system is as shown in FIG.

9 to 11, the reflected admittance seen in the AC driver is compared with a general transmit / receive resonator including only one coil.

Will increase by. That is, when the transmitter /

receiver resonators

100 and 200 including the individual coils 300b connected in parallel and appropriate frequency adjustment are used, the reflected admittance is increased and thus the power transmission amount is also increased.

The range of kCOIL here is between 0.2 and 0.7 for a typical implementation, but the above still applies even if it is not necessarily within that range.

The resonator including the individual coils 300b connected in parallel may be used only for the transmission resonator 100, may be used only for the reception resonator 200, or may be used for both.

If used for both, the reflected admittance is

Increases by.

The reference point for adjusting the frequency may be set in various ways.

First, when the effective resonance frequency changes by changing the coupling such as or, there is a method of changing other frequencies (driving frequency or resonant frequency of the opposite resonator) accordingly. In addition, there may be a method of keeping the effective resonant frequency constant even with age.

Alternatively, by mixing the two methods, the resonance frequency of the transmitter /

receiver resonators

100 and 200 or the inductance of each individual coil 300b connected in parallel to the transmitter /

receiver resonators

100 and 200 are also adjusted, and the driving frequency or resonance of the opposite resonator is adjusted. You can also adjust the frequency. Regardless of the method used, it is important to match or reconcile the effective resonant frequency with other frequencies.

As described above, in the detailed description of the present invention has been described with respect to preferred embodiments of the present invention, those skilled in the art to which the present invention pertains various modifications without departing from the scope of the present invention Of course this is possible. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the equivalents thereof, as well as the following claims.

Claims

AC driver;

A transmission resonator comprising a matching network and a transmission coil to transmit power received from the AC driver;

A reception resonator comprising a reception coil and a matching network to receive power transmitted from the transmission resonator;

A load receiving power received by the receiving resonator; And

Consists of a plurality of coupling expansion resonators located between the transmission / reception resonator,

The coupling expansion resonator is a wireless power transmission device, characterized in that formed to be biased to either side relative to the center between the transmitting / receiving resonator (기).
AC driver;

A transmission resonator comprising a matching network and a transmission coil to transmit power received from the AC driver;

A reception resonator including a reception coil and a matching network to receive power transmitted from the transmission resonator;

A load receiving power received by the receiving resonator; And

And a plurality of coupling expansion resonators located at the side or the rear of one or all of the transmitting / receiving resonators.
The method according to claim 1 or 2,

The coupling extension resonator is a wireless power transmission device, characterized in that formed in the range of 1 to 8.
The method of claim 1,

When the coupling expansion resonator is configured between the transmission and reception resonators, the effective resonance frequency according to the coupling between the coupling expansion resonator and the transmission resonator positioned close to the transmission resonator side (center reference) may be a driving frequency or A wireless power transmitter, characterized in that it is tuned to any one or more frequencies of the effective resonant frequency according to the coupling between the coupling resonator and the receiver resonator located close to the center (center reference).
The method of claim 1,

When the coupling expansion resonator is configured to be biased toward one of the centers between the transmission and reception resonators, an effective resonance frequency according to the coupling between the coupling expansion resonator and the biased resonator is driven. Or to one or more of the resonant frequencies of the opposite resonator.
The method of claim 2,

When the coupling expansion resonator is located at the side or the rear of both the transmitting and receiving resonators, the effective resonant frequency according to the coupling between the coupling expansion resonator and the transmission resonator located close to the transmitting resonator is driven or received. Wireless power transmission apparatus characterized in that the matching to the frequency of any one or more of the effective resonant frequency according to the coupling of the coupling expansion resonator and the receiving resonator located close to the side.
The method of claim 2,

When the coupling expansion resonator is located at the side or the rear of either of the transmission / reception resonators, the effective resonant frequency according to the coupling of the coupling expansion resonator and the adjacent resonator is driven or reversed. A wireless power transmission device, characterized in that to match any one or more of the resonant frequencies of the resonator.
AC driver;

A transmission resonator comprising a matching network and a transmission coil to transmit power received from the AC driver;

A reception resonator including a reception coil and a matching network to receive power transmitted from the transmission resonator;

A load receiving power received by the receiving resonator; And

And a plurality of individual coils connected to one or all of the transmitter / receiver resonators in parallel with the transmitter / receive coils.
The method of claim 8,

The individual coil is a wireless power transmission device, characterized in that configured in the range of 1 to 8.
The method of claim 8,

When the individual coil is configured in one of the transmitting resonator or the receiving resonator, the effective resonant frequency according to the coupling of the resonator where the individual coil and the individual coil are located is a driving frequency or a place where the individual coil is not configured. Wireless power transmission device, characterized in that to match any one or more of the resonant frequencies.
The method of claim 8,

When the individual coil is configured in both the transmitting and receiving resonator, the effective resonant frequency according to the coupling of the individual coil and the transmitting resonator of the transmitting resonator is the driving frequency or the effective resonant frequency according to the coupling of the receiving coil and the individual coil of the receiving resonator. Wireless power transmission apparatus, characterized in that tuned to any one or more of the frequencies.