KR20110135539A - Wireless power transmission apparatus and method, mobile terminal and method for receiving wireless power - Google Patents
Wireless power transmission apparatus and method, mobile terminal and method for receiving wireless power Download PDFInfo
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- KR20110135539A KR20110135539A KR1020100055319A KR20100055319A KR20110135539A KR 20110135539 A KR20110135539 A KR 20110135539A KR 1020100055319 A KR1020100055319 A KR 1020100055319A KR 20100055319 A KR20100055319 A KR 20100055319A KR 20110135539 A KR20110135539 A KR 20110135539A
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- mobile terminal
- sleep mode
- wireless power
- period
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Abstract
Description
TECHNICAL FIELD The present invention relates to a wireless power transmitter and a method thereof, a mobile terminal for receiving a wireless power, and a method for receiving a wireless power thereof.
Due to the characteristics of a mobile terminal whose main function is communication, battery performance of the mobile terminal has emerged as an important problem. In addition to mobile terminals, household appliances are provided with a function of wirelessly transmitting data, but power is generally provided through a power line.
Meanwhile, there is a technology for wirelessly supplying power to a mobile terminal using a frequency among wireless power transmission technologies. After the mobile terminal enters the sleep mode, the mobile terminal receives and charges the wireless power. However, even during the sleep mode, the mobile terminal periodically turns on / off and maintains communication with the base station. Therefore, when the sleep mode is turned on while the wireless power is being received, the communication signal with the base station and the wireless power cause interference.
In one aspect, a source unit for transmitting a wireless power to the first mobile terminal; And a controller configured to control the transmission of the wireless power according to on / off of the sleep mode in which the operation of the first mobile terminal is in an idle state.
The control unit transmits the wireless power while the sleep mode is off and the first mobile terminal and the base station are not in communication. The control unit transmits the wireless power while the sleep mode is on and the first mobile terminal and the base station communicate. The source unit may be controlled to stop transmission of the.
The apparatus may further include a communication unit configured to receive information about a period of a sleep mode of the first mobile terminal, a period in which the sleep mode is turned on and off.
When the transmission of the wireless power is requested from the second mobile terminal, when the sleep mode periods of the first mobile terminal and the second mobile terminal coincide with each other, the controller sends the first mobile terminal and the second mobile terminal to the second mobile terminal. The source unit may be controlled to transmit the wireless power.
The controller controls the communication unit to transmit information on the sleep mode period of the first mobile terminal to the second mobile terminal, and the second mobile terminal is based on the information on the transmitted sleep mode period. The sleep mode cycle of the second mobile terminal may be changed to the sleep mode cycle of the first mobile terminal, and the change result may be transmitted to the communication unit.
When the transmission of the wireless power is requested from the second mobile terminal, the base station matches the sleep mode period of the first mobile terminal and the second mobile terminal.
The control unit controls the source unit to start the transmission of the wireless power before the sleep mode is changed from an on state to an off state.
In another aspect, the communication unit for requesting the transmission of the wireless power to the transmitter for transmitting wireless power, and receives information on the period of the first sleep mode from the transmitter; A controller for changing a period of a second sleep mode preset in the mobile terminal to a period of the received first sleep mode; And a receiver configured to receive the wireless power from the transmitter during a period in which the communication unit does not communicate with a base station during a period of the first sleep mode.
The controller controls the communication unit to request that the base station change the period of the second sleep mode to the period of the first sleep mode.
According to another aspect, the method may further include: checking on / off of a sleep mode in which an operation of a first mobile terminal is in an idle state; In accordance with the on / off of the identified sleep mode, a wireless power transmission method including intermittently transmitting wireless power to the first mobile terminal is provided.
The transmitting may include transmitting the wireless power while the sleep mode is turned off and the first mobile terminal and the base station are not in communication, and while the sleep mode is turned on, the first mobile terminal and the base station communicate with each other. Stop transmission of wireless power.
And receiving information about a sleep mode period of the first mobile terminal, a period in which the sleep mode is turned on and off.
Requesting the second mobile terminal to match a sleep mode period between the first mobile terminal and the second mobile terminal when transmission of the wireless power is requested from a second mobile terminal; And transmitting the wireless power to the first mobile terminal and the second mobile terminal if the sleep mode periods coincide.
The requesting may include transmitting information about a sleep mode period of the first mobile terminal, a period during which the sleep mode is on and off, to the second mobile terminal, and the first mobile terminal from the second mobile terminal. The method may further include reporting that the sleep mode period of the second mobile terminal is matched.
The transmitting step starts the transmission of the wireless power before the sleep mode is changed from an on state to an off state.
In another aspect, a method comprising: requesting a transmitter for transmitting wireless power to transmit wireless power; Receiving information from the transmitter on a period of a first sleep mode that another mobile terminal is using; Changing a period of a second sleep mode preset in the mobile terminal to a period of the received first sleep mode; And receiving the wireless power from the transmitter during a period in which the mobile terminal does not communicate with a base station during a period of the first sleep mode.
Requesting the base station to change the period of the second sleep mode to the period of the first sleep mode.
A wireless power transmission apparatus and method thereof, a mobile terminal for wireless power reception and a wireless power reception method thereof are provided. The wireless power may be transmitted to the mobile terminal in consideration of the on-off period of the sleep mode when the mobile terminal operates in the sleep mode. As a result, interference between the mobile terminal and the wireless power transmission device can be minimized and wireless power can be effectively transmitted.
In addition, in the case of transmitting wireless power to two or more mobile terminals, the wireless power may be transmitted after matching the sleep modes of the mobile terminals. As a result, even when wireless power is simultaneously transmitted to mobile terminals, transmission efficiency may be increased.
In addition, by partially overlapping the on / off section of the ramp among the sections where the wireless power is transmitted, the amount of transmission of the wireless power may be increased.
1 illustrates a wireless power transfer system according to an exemplary embodiment.
2 is a block diagram illustrating an example of a wireless power transmission apparatus.
3 is a diagram for describing a period of a first sleep mode and a period of a WPT mode.
4 is a diagram for explaining a cycle of two or more sleep modes and a cycle of a WPT mode.
5 is a view for explaining an example of adjusting the period of the WPT mode in consideration of EMI.
FIG. 6 is a diagram for explaining a state change of an apparatus according to on and off of a first sleep mode.
7 is a block diagram illustrating an example of a second mobile terminal.
8 is a flowchart illustrating an example of a wireless power transmission method.
9 is a flowchart for explaining another example of the wireless power transmission method.
10 illustrates a meta-structured resonator according to an embodiment of the present invention.
FIG. 11 is a diagram illustrating an equivalent circuit of the resonator illustrated in FIG. 10.
12 illustrates a meta-structured resonator according to another embodiment of the present invention.
FIG. 13 is a diagram illustrating an insertion position of the capacitor of FIG. 12 in detail.
Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.
First, the wireless power transmission technology used in the wireless power transmission system will be described. Wireless power transmission technology can be classified into three types of electromagnetic induction method, radio wave reception method, electric field or magnetic field resonance method.
First, the electromagnetic induction method uses a phenomenon in which magnetic flux is generated when an alternating current flows in one coil after approaching two different coils close to each other, and thus electromotive force is generated in the other coil. The electromagnetic induction method has the most high efficiency and practical use, such as the power utilization efficiency is approximately 60-98%.
Second, in the radio wave reception method, radio wave energy is received and used by an antenna to convert an AC radio wave waveform into a direct current through a rectifier circuit to obtain power. Radio reception method is capable of transmitting wireless power over the longest distance (above several meters).
Third, the resonance method uses resonance of an electric field or a magnetic field, and transmits energy by resonating at the same frequency between devices. In case of using the resonance of the magnetic field, electric power is generated by using magnetic resonance coupling using the LC resonator structure. The magnetic resonance method is a technology that uses a near field effect of a short distance compared to the wavelength of the used frequency. Unlike the radio wave reception method, it is a non-radiative energy transmission, and matches the resonance frequency between the transmitter and the receiver. Send it. The magnetic resonance method increases the power transmission efficiency by about 50 ~ 60%, which is much higher than the radio wave reception type through radio wave radiation. Although the transmission / reception period distance is about several meters, although the technique used in the near field rather than the radio wave reception method, the power transmission is possible at a far distance than the electromagnetic induction type within a few mm.
1 illustrates a wireless power transfer system according to an exemplary embodiment.
In the example of FIG. 1, it is assumed that the wireless power transmitted through the wireless power transmission system is resonance power.
Referring to FIG. 1, a wireless power transmission system is a source-target structure consisting of a source and a target. That is, the wireless power transmission system includes a
The
The
The matching
The
The
The
The matching
The
The
Referring to FIG. 1, the control process of the cue-factor sets the resonance bandwidth of the
In resonant wireless power transmission, the resonance bandwidth is an important factor. When Qt is a Q-factor that considers the distance change between the
In
On the other hand, impedance mismatching between the
2 is a block diagram illustrating an example of a
The wireless power transmission (WPT)
Referring to FIG. 2, the
The
Hereinafter, information on the period of the first sleep mode and the first sleep mode of the sleep mode of the first
The first sleep mode is a mode in which the power of the first
3 is a diagram for describing a period of a first sleep mode and a period of a WPT mode.
As shown in FIG. 3, the first sleep mode periodically turns on and off. Therefore, the period of the first sleep mode means a period in which the first sleep mode is alternately turned on and off. When the first sleep mode is on, the first
The
In detail, the
The WPT mode of the
Meanwhile, the
When the wireless power is requested to be transmitted from the second
4 is a diagram for describing a period of the first and second sleep modes and a period of the WPT mode.
Referring to FIG. 4, the period of the first sleep mode and the period of the second sleep mode are different from each other before the period is changed. After the period is changed, the period of the first sleep mode and the period of the second sleep mode are the same, and the period of the WPT mode is opposite to the period of the first sleep mode. That is, the
Meanwhile, as illustrated in FIG. 5, the
5 is a view for explaining an example of adjusting the period of the WPT mode in consideration of EMI.
Referring to FIG. 5, it takes time when the WPT mode is changed from the off state to the on state, and the time consuming section is called a ramp section R. In the ramp section R, since the amount of wireless power transmission is small, EMI rarely occurs. Therefore, when the
As time passes, the
Referring to FIG. 2 again, the
The
The
FIG. 6 is a diagram for explaining a state change of an apparatus according to on and off of a first sleep mode.
Referring to FIG. 6, the WP transceiver Synch state is a state in which the
The charging state is a state in which the first
If the first sleep mode transitions to on when the
The stopped state is a state in which the
7 is a block diagram illustrating an example of a second
FIG. 7 is a diagram illustrating an operation in which the second
Referring to FIG. 7, the second
The
The
The
On the other hand, the period of the first sleep mode and the second sleep mode may be matched by the
When the period of the second sleep mode coincides with the period of the first sleep mode, the
Since the period of the first sleep mode and the period of the second sleep mode coincide with each other, the
For example, if the period of the matched sleep mode is the period of the first sleep mode, the
If the period of the matched sleep mode is the period of the second sleep mode, the
In addition, if the period of the matched sleep mode is the period of the third sleep mode, the
The
The
8 is a flowchart illustrating an example of a wireless power transmission method.
The wireless power transmission method of FIG. 8 may be operated by the
In
In
In
In
9 is a flowchart for explaining another example of the wireless power transmission method.
The wireless power transmission method of FIG. 9 may be operated by the
In
In
In
In
The base station changes the period of the second sleep mode to the period of the first sleep mode, the period of the first sleep mode to the period of the second sleep mode, or the period of the first sleep mode at the request of the second mobile terminal. And a cycle of the second sleep mode to another cycle of the third sleep mode. Thus, the period of the first sleep mode and the period of the second sleep mode coincide.
In
In
In
In
In FIG. 9, the base station has described the case where the period of the first sleep mode coincides with the period of the second sleep mode as an example. The period of the first sleep mode and the period of the second sleep mode may be matched not only by the base station but also by the second mobile terminal.
Meanwhile, the
10 illustrates a meta-structured resonator according to an embodiment of the present invention.
Referring to FIG. 10, the meta-structured resonator includes a transmission line 1010 and a capacitor 1020. Here, the capacitor 1020 is inserted in series at a specific position of the transmission line 1010, and the electric field is trapped in the capacitor.
In addition, the meta-structured resonator has a form of a three-dimensional structure, as shown in FIG. Unlike the illustrated in FIG. 10, the resonator may be implemented in a two-dimensional structure in which transmission lines are arranged in x and z planes.
The capacitor 1020 is inserted into the transmission line 1010 in the form of a lumped element and a distributed element, for example, an interdigital capacitor or a gap capacitor centered on a substrate having a high dielectric constant. As the 1020 is inserted into the transmission line 1010, the resonator may have a metamaterial characteristic.
Here, the metamaterial is a material having special electrical properties that cannot be found in nature, and has an artificially designed structure. The electromagnetic properties of all materials in nature have an intrinsic permittivity or tutor rate, and most materials have positive permittivity and positive permeability. In most materials, the right-hand rule applies to electric fields, magnetic fields and pointing vectors, so these materials are called RHM (Right Handed Material). However, metamaterials are materials with a permittivity or permeability of less than 1, and according to the sign of permittivity or tutor rate, ENG (epsilon negative) materials, MNG (mu negative) materials, DNG (double negative) materials, NRI (negative refractive index) ) And LH (left-handed) substances.
At this time, when the capacitance of the capacitor inserted as the lumped element is properly determined, the resonator may have the characteristics of the metamaterial. In particular, by appropriately adjusting the capacitance of the capacitor, the resonator may have a negative permeability, so that the resonator according to an embodiment of the present invention may be referred to as an MNG resonator.
The MNG resonator may have a zero-order resonance characteristic having a frequency when the propagation constant is 0 as a resonance frequency. Since the MNG resonator may have a zeroth resonance characteristic, the resonant frequency may be independent of the physical size of the MNG resonator. That is, as will be described again below, in order to change the resonant frequency in the MNG resonator, it is sufficient to design the capacitor appropriately, so that the physical size of the MNG resonator may not be changed.
In addition, in the near field, the electric field is concentrated in the series capacitor 1020 inserted in the transmission line 1010, so that the magnetic field is dominant in the near field due to the series capacitor 1020.
In addition, the MNG resonator may have a high Q-Factor using the capacitor 1020 to the lumped element, thereby improving the efficiency of power transmission.
In addition, the MNG resonator may include a matcher 1030 for impedance matching. At this time, the matcher 1030 can properly adjust the strength of the magnetic field for coupling with the MNG resonator, and the impedance of the MNG resonator is adjusted by the matcher 1030. The current flows into or out of the MNG resonator through the connector 1040.
In addition, although not explicitly illustrated in FIG. 10, a magnetic core penetrating the MNG resonator may be further included. Such a magnetic core may perform a function of increasing a power transmission distance.
The characteristics of the MNG resonator of the present invention will be described in detail below.
FIG. 11 is a diagram illustrating an equivalent circuit of the resonator illustrated in FIG. 10.
The resonator shown in FIG. 10 may be modeled with the equivalent circuit shown in FIG. In the equivalent circuit of FIG. 11, CL denotes a capacitor inserted in the form of a lumped element in the middle of the transmission line of FIG. 10.
At this time, the resonator for wireless power transmission shown in FIG. 10 has a zeroth resonance characteristic. That is, when the propagation constant is 0, the resonator for wireless power transmission
Referring to Equation 2, the resonant frequency of the resonator
12 illustrates a meta-structured resonator according to another embodiment of the present invention.
Referring to FIG. 12, the meta-structured resonator includes a
In the
The
The
The
FIG. 13 is a diagram illustrating an insertion position of the
Referring to FIG. 13, the
Methods according to an embodiment of the present invention can be implemented in the form of program instructions that can be executed by various computer means and recorded in a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. Program instructions recorded on the media may be those specially designed and constructed for the purposes of the present invention, or they may be of the kind well-known and available to those having skill in the computer software arts.
As described above, the present invention has been described by way of limited embodiments and drawings, but the present invention is not limited to the above embodiments, and those skilled in the art to which the present invention pertains various modifications and variations from such descriptions. This is possible.
Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the claims below but also by the equivalents of the claims.
200: WPT device 210: communication unit
220: control unit 230: storage unit
240: EMI measuring unit 250: source unit
300: a first mobile terminal 400: a second mobile terminal
Claims (19)
Control unit for controlling the transmission of the wireless power in accordance with the on / off of the sleep mode in which the operation of the first mobile terminal is idle.
Wireless power transmission device comprising a.
The control unit transmits the wireless power while the sleep mode is off and the first mobile terminal and the base station are not in communication. The control unit transmits the wireless power while the sleep mode is on and the first mobile terminal and the base station communicate. And controlling the source unit to pause transmission of the wireless power.
A communication unit for receiving information about the period of the sleep mode of the first mobile terminal-the period in which the sleep mode is on-off-
The wireless power transmission device further comprising.
When the transmission of the wireless power is requested from the second mobile terminal, when the sleep mode periods of the first mobile terminal and the second mobile terminal coincide with each other, the controller sends the first mobile terminal and the second mobile terminal to the second mobile terminal. And controlling the source unit to transmit the wireless power.
The control unit controls the communication unit to transmit information on the sleep mode period of the first mobile terminal to the second mobile terminal,
The second mobile terminal changes the sleep mode period of the second mobile terminal to the sleep mode period of the first mobile terminal based on the information on the transmitted sleep mode period, and transmits the change result to the communication unit. Wireless power transmission device.
When the transmission of the wireless power is requested from a second mobile terminal, the base station matches the sleep mode period of the first mobile terminal and the second mobile terminal, the wireless power transmission apparatus.
And the control unit controls the source unit to start the transmission of the wireless power before the sleep mode is changed from an on state to an off state.
A communication unit requesting a transmitter for transmitting wireless power to transmit wireless power and receiving information on a period of a first sleep mode from the transmitter;
A controller configured to change a period of a second sleep mode preset in the mobile terminal to a period of the received first sleep mode; And
A receiver that receives the wireless power from the transmitter during a period in which the communication unit does not communicate with a base station during the period of the first sleep mode.
Mobile terminal for receiving a wireless power comprising a.
The control unit controls the communication unit to request the base station to change the period of the second sleep mode to the period of the first sleep mode.
Intermittently transmitting wireless power to the first mobile terminal according to the on / off of the identified sleep mode
Wireless power transmission method comprising a.
The transmitting step,
While the sleep mode is off and the first mobile terminal and the base station are not communicating, the wireless power is transmitted. While the sleep mode is turned on, the wireless power is temporarily transmitted while the first mobile terminal and the base station are communicating. Stationary, wireless power transfer method.
Receiving information on a sleep mode period of the first mobile terminal, a period in which the sleep mode is turned on and off;
The wireless power transmission method further comprising.
Requesting the second mobile terminal to match a sleep mode period between the first mobile terminal and the second mobile terminal when transmission of the wireless power is requested from a second mobile terminal; And
If the sleep mode periods match, transmitting the wireless power to the first mobile terminal and the second mobile terminal.
The wireless power transmission method further comprising.
The requesting may include transmitting information about a sleep mode period of the first mobile terminal, a period in which the sleep mode is turned on and off, to the second mobile terminal.
Receiving a report from the second mobile terminal that the sleep mode periods of the first mobile terminal and the second mobile terminal are matched;
Wireless power transmission method further comprising.
When the transmission of the wireless power is requested from a second mobile terminal, the base station matches the sleep mode period of the first mobile terminal and the second mobile terminal, wireless power transmission method.
The transmitting step,
And transmitting the wireless power before the sleep mode is changed from an on state to an off state.
Requesting a transmitter for transmitting wireless power to transmit wireless power;
Receiving information from the transmitter on a period of a first sleep mode that another mobile terminal is using;
Changing a period of a second sleep mode preset in the mobile terminal to a period of the received first sleep mode; And
Receiving the wireless power from the transmitter during a period in which the mobile terminal does not communicate with a base station during the period of the first sleep mode;
Wireless power receiving method of a mobile terminal comprising a.
Requesting the base station to change the period of the second sleep mode to the period of the first sleep mode.
Further comprising, the wireless power receiving method of the mobile terminal.
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| Application Number | Priority Date | Filing Date | Title |
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| KR1020100055319A KR101635972B1 (en) | 2010-06-11 | 2010-06-11 | Wireless Power Transmission Apparatus and Method, Mobile Terminal and Method for Receiving Wireless Power |
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| KR1020100055319A KR101635972B1 (en) | 2010-06-11 | 2010-06-11 | Wireless Power Transmission Apparatus and Method, Mobile Terminal and Method for Receiving Wireless Power |
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| KR101635972B1 KR101635972B1 (en) | 2016-07-04 |
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| KR20120009628A (en) * | 2010-07-19 | 2012-02-02 | 엘지전자 주식회사 | Wireless charging aparatus and method for a mobile comunication terminal |
| KR101405811B1 (en) * | 2012-03-26 | 2014-06-12 | 엘지이노텍 주식회사 | Mobile terminal and apparatus for receiving wireless power and method for controlling power of wireless power receiver |
| US9054747B2 (en) | 2012-03-26 | 2015-06-09 | Lg Innotek Co., Ltd. | Mobile terminal and power control method thereof |
| US9729203B2 (en) | 2013-01-22 | 2017-08-08 | Samsung Electronics Co., Ltd. | Resonator having increased isolation |
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| US9729203B2 (en) | 2013-01-22 | 2017-08-08 | Samsung Electronics Co., Ltd. | Resonator having increased isolation |
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| KR101635972B1 (en) | 2016-07-04 |
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