WO2018212376A1 - Wireless charging power reception device having plurality of reception antennas - Google Patents

Abstract

A wireless charging power reception device having a plurality of reception antennas is disclosed. When a plurality of wireless charging powers are received through a plurality of wireless charging power reception antennas, the wireless charging power reception device having the plurality of reception antennas, according to the present invention, detects a phase of each wireless charging power, calculates phase differences of a phase of a first wireless charging power among the plurality of wireless charging powers from those of the other wireless charging powers, and then shifts the phases of the remaining wireless charging powers by respective phase differences so as to convert the phases of the plurality of wireless charging powers to be the same phase, thereby outputting a high level of combined wireless charging power since each wireless charging power has the same phase when the plurality of wireless charging powers are combined, such that a high level of charging power can be supplied to a battery.

Description

Wireless charging power receiving device having a plurality of receiving antennas

Embodiments of the present invention relate to techniques for a wireless charging power receiver for receiving wireless charging power from a wireless charging power transmitter.

Recently, as the spread of various portable devices such as smart phones and tablet PCs increases, efforts to increase the use time of such portable devices have been continued.

As part of such efforts, devices that manufacture batteries installed in portable devices, rather than built-in types, may be released to facilitate replacement of batteries, and devices equipped with high-capacity batteries are also released.

However, since these portable devices eventually adopt a battery, a study on a technique for supporting charging of the battery mounted in the portable device more easily and efficiently is required.

Currently, most of the general portable devices on the market are connected by a predetermined charging cable to the portable device to charge the battery mounted in the portable device by wire.

However, in recent years, since the wired charging method impairs the convenience of the user, a wireless charging technology for charging a portable device battery in a wireless manner has been introduced.

Such wireless charging techniques include a wireless charging technique according to electromagnetic induction and a wireless charging technique according to magnetic resonance. Both the wireless charging technique based on electromagnetic induction and the wireless charging technique based on magnetic resonance use non-radial attenuated alternating current signals around the coil in the near field. That is, a method of charging a battery without a contact terminal by using an inductive coupling between a primary coil of a wireless charging power transmitter and a secondary coil of a wireless charging power receiver is introduced.

Usually, when the wireless charging power receiver receives the charging power from the wireless charging power transmitter, the AC voltage applied to the charging power receiver is rectified to the DC voltage through the rectifier, and the constant voltage and the constant current to be supplied to the battery using the DC voltage. After generating the supply to the battery, it is configured in the form of charging the battery.

Recently, a plurality of wireless charging power transmitting antennas are mounted in a wireless charging power transmitting device, and a plurality of wireless charging power receiving antennas are also mounted in the wireless charging power receiving device, so that the wireless charging power receiving device receives the plurality of wireless charging power. Techniques have been introduced that allow for obtaining a plurality of wireless charging powers via antennas and combining the received plurality of wireless charging powers to obtain high charging power.

However, the plurality of wireless charging powers obtained through the plurality of wireless charging power receiving antennas may be out of phase with each other, as shown in FIG. 1, and thus, when combining wireless charging powers having different phases, respectively. On the contrary, the charging power may be lowered.

For example, as shown in FIG. 1, the wireless charging power receiver has a phase equal to "wireless charging power 1" and "signal 2" 112 having a phase equal to "signal 1" 111. When the wireless charging power 2 is received, since the "wireless charging power 1" and the "wireless charging power 2" are out of phase with each other, when both wireless charging powers are combined as they are, the "signal 3" 113 As described above, the charging power at which the power magnitude is "0" is obtained.

In this case, the wireless charging power receiver may not be able to charge the battery because it does not properly obtain the charging power.

Therefore, in the wireless charging power receiving apparatus equipped with the plurality of wireless charging power receiving antennas, when combining the wireless charging powers in consideration of the phase of the plurality of wireless charging powers received through the respective antennas, the charging power having a high magnitude Research into techniques to assist in the acquisition of the data is needed.

In addition, conventional wireless charging power receivers have a problem in that charging efficiency is inferior in that they charge the battery regardless of the magnitude of the charging power received by the wireless charging power receiver.

In this regard, in order to allow normal charging of the battery, a predetermined required power to be applied to the battery is required according to the state of charge of the battery. There is a need for a technique to support the scaling of the wireless charging power transmitted from the system.

In the wireless charging power receiving apparatus having a plurality of receiving antennas according to the present invention, when a plurality of wireless charging powers are received through a plurality of wireless charging power receiving antennas, the wireless charging power is detected after detecting a phase of each of the wireless charging powers. Calculating a phase difference with the remaining wireless charging powers based on the phase of the first wireless charging power, and then shifting the phases of the remaining wireless charging powers by each phase difference to phase the plurality of wireless charging powers. By converting to the same phase, when the plurality of wireless charging powers are combined, the combined wireless charging power having a large size is outputted because each of the wireless charging powers have the same phase so as to generate a high magnitude of charging power for the battery. Make it available.

A wireless charging power receiver having a plurality of receiving antennas according to an embodiment of the present invention includes a plurality of wireless charging powers for receiving a plurality of wireless charging powers transmitted from a wireless charging power transmitter equipped with a plurality of wireless charging power transmitting antennas. A phase detector configured to detect a phase of wireless charging powers received by each of the plurality of wireless charging power receiving antennas when wireless charging powers are received through the wireless charging power receiving antennas and the plurality of wireless charging power receiving antennas; A phase control unit for converting all of the phases of the wireless charging powers received at each of the plurality of wireless charging power receiving antennas to the same phase based on a phase detection result of the wireless charging powers received at each of the wireless charging power receiving antennas of Wireless charging converted to the same phase Combining the power to output a combined wireless charging power and rectifying the AC voltage generated by the combined wireless charging power to generate a DC voltage for charging the battery, based on the DC voltage And a charging unit for charging the battery by generating a constant voltage and a constant current to supply the constant voltage and the constant current to the battery.

In the wireless charging power receiving apparatus having a plurality of receiving antennas according to the present invention, when a plurality of wireless charging powers are received through a plurality of wireless charging power receiving antennas, the wireless charging power is detected after detecting a phase of each of the wireless charging powers. Calculating a phase difference with the remaining wireless charging powers based on the phase of the first wireless charging power, and then shifting the phases of the remaining wireless charging powers by each phase difference to phase the plurality of wireless charging powers. By converting to the same phase, when the plurality of wireless charging powers are combined, the combined wireless charging power having a large size is outputted because each of the wireless charging powers have the same phase so as to generate a high magnitude of charging power for the battery. Can supply

FIG. 1 is a diagram illustrating a situation when a wireless charging power receiver combines wireless charging powers having different phases.

2 is a diagram illustrating the structure of a wireless charging power receiving apparatus having a plurality of receiving antennas according to an embodiment of the present invention.

3 is a view for explaining the operation of the wireless charging power receiving apparatus having a plurality of receiving antennas according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. This description is not intended to limit the invention to the specific embodiments, it should be understood to include all changes, equivalents, and substitutes included in the spirit and scope of the invention. In describing the drawings, similar reference numerals are used for similar components, and unless otherwise defined, all terms used in the present specification, including technical or scientific terms, may be used in the art to which the present invention pertains. It has the same meaning as is commonly understood by someone who has it.

2 is a diagram illustrating the structure of a wireless charging power receiving apparatus having a plurality of receiving antennas according to an embodiment of the present invention.

2, the wireless charging power receiver 210 having a plurality of receiving antennas according to an embodiment of the present invention includes a plurality of wireless charging power receiving antennas 211, a phase detector 212, and a phase controller ( 213, a power combiner 214, and a charger 215.

The plurality of wireless charging power receiving antennas 211 receives a plurality of wireless charging powers transmitted from the wireless charging power transmitting apparatus 230 in which the plurality of wireless charging power transmitting antennas are mounted.

When the wireless charging powers are received through the plurality of wireless charging power receiving antennas 211, the phase detector 212 detects a phase of the wireless charging powers received by each of the plurality of wireless charging power receiving antennas 211.

The phase controller 213 may perform wireless charging on each of the wireless charging power receiving antennas 211 based on a phase detection result of wireless charging powers received on each of the wireless charging power receiving antennas 211. The phases of the powers are all converted to the same phase.

The power combiner 214 combines the wireless charging powers converted into the same phase to output the combined wireless charging power.

The charging unit 215 rectifies the AC voltage generated by the combined wireless charging power to generate a DC voltage for charging the battery, and generates a constant voltage and a constant current based on the DC voltage to generate the constant voltage and the constant current to the battery. The battery is charged by supplying

At this time, according to an embodiment of the present invention, the phase controller 213 may include a phase difference calculator 216 and a phase converter 217.

The phase difference calculator 216 determines the first wireless charging power receiving antenna as a reference antenna among the plurality of wireless charging power receiving antennas 211, and receives the first wireless charging power received through the first wireless charging power receiving antenna. The first phase and the remaining wireless charging power receiving antennas (the remaining wireless charging power receiving antennas are the first wireless charging power receiving antennas of the plurality of wireless charging power receiving antennas 211). Calculate the phase difference between the phase of each of the remaining wireless charging powers received through each of the antennas excluded.

In addition, the phase shifter 217 performs a phase of each of the remaining wireless charging powers received through each of the remaining wireless charging power receiving antennas based on the phase difference calculated for each of the remaining wireless charging powers. The phases of the wireless charging powers received at each of the plurality of wireless charging power receiving antennas 211 are all shifted to the same phase by shifting by the phase difference calculated with respect to the charging powers.

For example, the wireless charging power 1 having the same phase as the "signal 1" 111 shown in FIG. 1 is received through the wireless charging power receiving antenna 1 and the "shown in FIG. 1 via the wireless charging power receiving antenna 2. When the wireless charging power 2 having the same phase as the signal "112" is received, the phase difference calculator 216 is the wireless charging power receiving antenna 1 and the wireless charging power receiving antenna 2 which is either of the wireless The charging power receiving antenna 1 may be determined as the reference antenna.

Then, the phase difference calculator 216 is based on the phase of the wireless charging power 1 received through the wireless charging power receiving antenna 1, the phase of the wireless charging power 1 and the wireless charging power receiving antenna 2 which is the remaining antennas. The phase difference between the phases of the wireless charging power 2 received through may be calculated.

In this case, the phase conversion unit 217 shifts the phase of the wireless charging power 2 by the phase difference based on the phase difference calculated for the wireless charging power 2, thereby shifting the wireless charging power 2 to FIG. 3. The wireless charging power 2 may be converted to the same phase as the wireless charging power 1 by converting the signal as shown in “No. 2” 311.

As illustrated in FIG. 3, when the phases of the wireless charging power 1 and the wireless charging power 2 are converted to the same phase, the power combiner 214 exchanges the wireless charging power 1 and the wireless charging power 2 with each other. In combination, the combined wireless charging power having a form such as "signal number 3" 312 shown in FIG. 3 may be output.

Thereafter, the charging unit 215 rectifies the AC voltage generated by the combined wireless charging power to generate a DC voltage for charging the battery, and generates a constant voltage and a constant current based on the DC voltage to generate the constant voltage and the constant current. By supplying to the battery, the battery can be charged.

As a result, the wireless charging power receiving apparatus 210 having a plurality of receiving antennas according to the present invention, when a plurality of wireless charging powers are received through the plurality of wireless charging power receiving antennas 211, phases of the respective wireless charging powers. After detecting the phase difference with the other wireless charging powers based on the phase of the first wireless charging power of the plurality of wireless charging powers, and shifts the phase of the remaining wireless charging powers by each phase difference by the phase By converting the phases of the wireless charging powers to the same phase, when the plurality of wireless charging powers are combined, the combined wireless charging power having a large size is outputted because the respective wireless charging powers have the same phase. It can supply a high amount of charging power.

In this case, according to an embodiment of the present invention, the phase controller 213 may further include a first register 218 and a second register 219, and the phase converter 217 may include a data code extractor 220. ) And the phase shift processing unit 221.

The first register 218 corresponds to n bits of different data codes corresponding to each of predetermined different phase difference ranges that define a lower limit value and an upper limit value of n (n is a natural number) divided phases. Store and maintain the stored phase difference table.

For example, the first register 218 may store a phase difference table in which information shown in Table 1 below is stored.

Different phase difference ranges	Data code
0˚ ~ 5˚	0000
5˚ ~ 10˚	0001
10˚ ~ 15˚	0010
...	...

The second register 219 stores and maintains a shift table in which predetermined different shift values for phase shift are correspondingly stored for each of the n-bit different data codes.

For example, the second register 219 may store a phase difference table in which information shown in Table 2 below is stored.

Data code	shift  value
0000	3˚
0001	7˚
0010	13˚
...	...

In this case, when the calculation of the phase difference for each of the remaining wireless charging powers is completed, the data code extracting unit 220 refers to the phase difference table to which each of the phase differences calculated for each of the remaining wireless charging powers belongs. The data codes stored corresponding to the phase difference range are extracted.

The phase shift processor 221 extracts shift values stored corresponding to each of the extracted data codes by referring to the shift table, and corresponds to a phase of each of the remaining wireless charging powers among the extracted shift values. Shift by the shift value.

For example, a phase difference between the wireless charging power 1 received through the wireless charging power receiving antenna 1 and the wireless charging power 2 received through the wireless charging power receiving antenna 2 is “12 °”, and the wireless charging power receiving antenna 1 is the reference antenna. In this case, the data code extracting unit 220 refers to a phase difference table as shown in Table 1, and the phase difference range 10 ° to 15 ° to which the phase difference "12 °" calculated for the wireless charging power 2 belongs. It is possible to extract "0010" which is a data code stored in correspondence with.

Then, the phase conversion processing unit 221 may shift the phase of the wireless charging power 2 by "13 degrees" by extracting "13 degrees" which is a shift value stored corresponding to "0010" with reference to the shift table. have.

Usually, the wireless charging power receiver is composed of electronic circuits, which make it difficult to fine tune the phase shift for each wireless charging powers, making the phases of each wireless charging powers exactly the same. There is a limit. For this reason, the wireless charging power receiver 210 having a plurality of receiving antennas according to the present invention is a control scheme for making the phases of the respective wireless charging powers substantially the same, for each of the predetermined phase difference ranges. By constructing a phase difference table storing different data codes of bits and a shift table storing shift values corresponding to each of the n different data codes of bits, when the phase difference calculation for the wireless charging powers is completed, Extracts a data code corresponding to a phase difference range to which the phase difference belongs from the phase difference table, extracts a shift value corresponding to the extracted data code from the shift table, and then phases each wireless charging power by the shift value; By converting, even if the phases of the respective wireless charging powers have approximately the same phase Can be locked.

In order to finely adjust the phase conversion of the wireless charging powers, the size of the data code to be stored on the phase difference table stored in the first register 218 is set to be larger, and thus the phase difference is increased. The phase difference ranges to be stored on the table are further classified, and the shift values to be stored in the shift table stored in the second register 219 may be further classified and stored according to the data code. However, in this case, since the data sizes of the phase difference table and the shift table are also increased, the data capacity that the first register 218 and the second register 219 can store must be considered together.

According to an embodiment of the present invention, the wireless charging power receiver 210 having a plurality of receiving antennas may include a power calculation unit 222, power consumption sensing unit 223, verification unit 224, and signal transmission unit ( 225 may be further included.

When charging of the battery is started, the required power calculating unit 222 checks the remaining charge power of the battery and calculates the required power for charging the battery according to the remaining charge power of the battery.

At this time, according to an embodiment of the present invention, the necessary power calculation unit 222 is required to record the predetermined necessary power values required for charging the battery for each of different predetermined conditions according to the remaining charge power of the battery. The required power corresponding to a state according to the remaining charge power of the battery may be calculated with reference to a power table.

For example, information may be recorded in the required power table as shown in Table 3 below.

Battery's charge power level	Battery status	Power required
0% to 20%	lowness	10 W
20%-60%	usually	6 W
60%-100%	height	3 W

In this case, the required power calculator 222 may calculate the required power corresponding to the state according to the remaining charge power of the battery with reference to the required power table as shown in Table 3 above.

The power consumption sensing unit 223 senses power consumption of the system according to the operation of the wireless charging power receiver 210.

The identification unit 224 determines whether the combined wireless charging power exceeds the sum of the required power and the system power consumption.

The signal transmitter 225 transmits the wireless charging power to the wireless charging power transmitter 230 when it is determined that the combined wireless charging power does not exceed the sum of the required power and the system power consumption. A signal strength enhancement request signal is transmitted that requires signal strength enhancement.

That is, in the wireless charging power receiver 210 having a plurality of receiving antennas according to the present invention, the size of the combined wireless charging power output through the power combiner 214 is required to be supplied to the battery and the wireless charging power. If less than the sum of the power consumption of the receiving device 210 itself, since the normal charging for the battery is impossible, the signal requiring the wireless charging power transmitter 230 to improve the transmission signal strength of the wireless charging power; By transmitting the strength enhancement request signal, the wireless charging power transmitter 230 may be induced to transmit the wireless charging power having a higher magnitude.

At this time, according to an embodiment of the present invention, the confirmation unit 224 is the size of the wireless charging power coupled through the power combiner 214 for a predetermined reference time after the signal strength enhancement request signal is transmitted is required. If it is determined that the sum of the power and the system power consumption is exceeded, and it is determined that the magnitude of the combined wireless charging power does not exceed the sum of the required power and the system power consumption within the reference time, Can generate a non-chargeable signal.

In this case, when the charge impossible signal for the battery is generated, the signal transmitter 225 may transmit a charge stop request signal to the wireless charging power transmitter 230 to stop the transmission of the wireless charging power.

That is, although the wireless charging power receiver 210 having the plurality of receiving antennas according to the present invention transmits the signal strength enhancement request signal to the wireless charging power transmitter 230, the wireless power to be supplied to the battery If the magnitude of the charging power does not increase, it is determined that there is a problem with the wireless charging, and by sending a charge stop request signal requesting the interruption of the transmission of the wireless charging power to the wireless charging power transmission device 230, unnecessary power consumption Can be reduced.

In the present invention as described above has been described by the specific embodiments, such as specific components and limited embodiments and drawings, but this is provided to help a more general understanding of the present invention, the present invention is not limited to the above embodiments. For those skilled in the art, various modifications and variations are possible from these descriptions.

Therefore, the spirit of the present invention should not be limited to the described embodiments, and all the things that are equivalent to or equivalent to the claims as well as the following claims will belong to the scope of the present invention. .

Claims (5)

1. A plurality of wireless charging power receiving antennas for receiving a plurality of wireless charging powers transmitted from a wireless charging power transmitting apparatus equipped with a plurality of wireless charging power transmitting antennas;

   A phase detector configured to detect a phase of wireless charging powers received at each of the plurality of wireless charging power receiving antennas when wireless charging powers are received through the plurality of wireless charging power receiving antennas;

   Converting all of the phases of the wireless charging powers received at each of the plurality of wireless charging power receiving antennas to the same phase based on a phase detection result of the wireless charging powers received at each of the plurality of wireless charging power receiving antennas; Phase control unit;

   A power combiner configured to output the combined wireless charging power by combining the wireless charging powers converted into the same phase; And

   Generating a DC voltage for charging the battery by rectifying the AC voltage generated by the combined wireless charging power, generating a constant voltage and a constant current based on the DC voltage, and supplying the constant voltage and the constant current to the battery, Charging part to charge battery

   Wireless charging power receiving device having a plurality of receiving antennas comprising a.
2. The method of claim 1,

   The phase control unit

   The first wireless charging power receiving antenna of the plurality of wireless charging power receiving antennas is determined as a reference antenna, and based on the first phase of the first wireless charging power received through the first wireless charging power receiving antenna, A first phase and the remaining wireless charging power receiving antennas, wherein the remaining wireless charging power receiving antennas are antennas excluding the first wireless charging power receiving antenna from among the plurality of wireless charging power receiving antennas; A phase difference calculator for calculating a phase difference between phases of each of the remaining wireless charging powers; And

   A phase difference calculated for each of the wireless charging powers, based on the phase difference calculated for each of the remaining wireless charging powers, for each of the wireless charging powers; A phase shifter which shifts the phases of the wireless charging powers received by each of the plurality of wireless charging power receiving antennas to the same phase

   Wireless charging power receiving device having a plurality of receiving antennas comprising a.
3. The method of claim 2,

   The phase control unit

   For each of the predetermined different phase difference ranges that define the lower limit and the upper limit of the phase difference divided by n (n is a natural number), n-bit different data codes are stored correspondingly. A first register to store and hold; And

   A second register for storing and maintaining a shift table in which predetermined different shift values for phase shift are correspondingly stored for each of the n-bit different data codes

   More,

   The phase shifter

   When the calculation of the phase difference for each of the remaining wireless charging powers is completed, the phase difference calculated for each of the remaining wireless charging powers is stored in correspondence with the phase difference table, referring to the phase difference table. A data code extraction unit for extracting data codes; And

   A phase shifting processor configured to extract shift values stored corresponding to each of the extracted data codes by referring to the shift table and shift the phase of each of the remaining wireless charging powers by a corresponding shift value among the extracted shift values

   Wireless charging power receiving device having a plurality of receiving antennas comprising a.
4. The method of claim 1,

   A power calculation unit configured to check a remaining charge power of the battery and calculate a required power for charging the battery according to the remaining charge power of the battery when charging of the battery is started;

   A power consumption sensing unit configured to sense system power consumption according to an operation of the wireless charging power receiver;

   A confirmation unit to determine whether the combined amount of wireless charging power exceeds the sum of the required power and the system power consumption; And

   A signal requesting the wireless charging power transmitter to improve the transmission signal strength of the wireless charging power when it is determined that the magnitude of the combined wireless charging power does not exceed the sum of the required power and the system power consumption. Signal transmission unit for transmitting the strength enhancement request signal

   Wireless charging power receiving apparatus having a plurality of receiving antennas further comprising.
5. The method of claim 4, wherein

   The required power calculating unit

   The need corresponding to a state according to the remaining charge power of the battery by referring to a required power table in which predetermined necessary power values for charging the battery are recorded for each of different predetermined states according to the remaining charge power of the battery. Calculate the power,

   The verification unit

   After the signal strength enhancement request signal is transmitted, it is determined whether the magnitude of the wireless charging power coupled through the power combiner for a predetermined reference time exceeds the sum of the required power and the system power consumption, and thus, within the reference time. If it is determined that the magnitude of the combined wireless charging power does not exceed the sum of the required power and the system power consumption, a non-chargeable signal is generated for the battery;

   The signal transmission unit

   And a plurality of receiving antennas configured to transmit a charge stop request signal for requesting an interruption of transmission of wireless charging power to the wireless charging power transmitter when the non-chargeable signal for the battery is generated.

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