KR20170024999A - Wireless power transmitting apparatus and method for controlling the same - Google Patents
Wireless power transmitting apparatus and method for controlling the same Download PDFInfo
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- KR20170024999A KR20170024999A KR1020150120759A KR20150120759A KR20170024999A KR 20170024999 A KR20170024999 A KR 20170024999A KR 1020150120759 A KR1020150120759 A KR 1020150120759A KR 20150120759 A KR20150120759 A KR 20150120759A KR 20170024999 A KR20170024999 A KR 20170024999A
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- H02J7/025—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
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Abstract
Description
BACKGROUND OF THE
Recently, as the information and communication technology rapidly develops, a ubiquitous society based on information and communication technology is being made.
In order for information communication devices to be connected anytime and anywhere, sensors equipped with a computer chip having a communication function must be installed in all facilities of the society. Therefore, power supply problems of these devices and sensors are becoming a new challenge. In addition, mobile devices such as Bluetooth handsets, music players, and the like have rapidly increased in number as well as mobile phones, and charging the battery has required users time and effort. As a way to solve this problem, wireless power transmission technology has recently attracted attention.
The wireless power transmission technology (wireless power transmission or wireless energy transfer) is a technology to transmit electric energy from the transmitter to the receiver wirelessly using the induction principle of the magnetic field. In the 1800s, electric motor or transformer Thereafter, a method of transmitting electric energy by radiating an electromagnetic wave such as a radio wave or a laser was tried. Our electric toothbrushes and some wireless shavers are actually charged with electromagnetic induction.
Until now, energy transmission using radio has been classified into electromagnetic induction, magnetic resonance, and RF transmission using short wavelength radio frequency.
In the electromagnetic induction method, when two coils are adjacent to each other and a current is supplied to one coil, a magnetic flux generated at this time causes an electromotive force to the other coils. This technique is rapidly commercialized centering on small- . Electromagnetic induction has the disadvantage of being able to transmit power of up to several hundred kilowatts (kW) and high efficiency, but the maximum transmission distance is less than 1 centimeter (cm), so it must be generally adjacent to the charger or floor.
The electromagnetic resonance method is characterized by using an electric field or a magnetic field instead of using an electromagnetic wave or a current. The electromagnetic resonance method is advantageous in that it is safe to other electronic devices and human body since it is hardly influenced by the electromagnetic wave problem. On the other hand, it can be used only at a limited distance and space, and has a disadvantage that energy transfer efficiency is somewhat low.
Short wavelength wireless power transmission - simply, RF transmission - takes advantage of the fact that energy can be transmitted and received directly in radio wave form. This technology is a RF power transmission system using a rectenna. Rectena is a combination of an antenna and a rectifier, which means a device that converts RF power directly into direct current power. That is, the RF method is a technique of converting an AC radio wave into DC and using it. Recently, as the efficiency has improved, commercialization has been actively researched.
Wireless power transmission technology can be applied not only to mobile, but also to various industries such as IT, railroad, and household appliance industry.
In recent years, devices equipped with a plurality of wireless power transmitters have appeared, but the rise of wireless power transmitting devices with more user convenience is required.
It is an object of the present invention to provide a wireless power transmission apparatus having a plurality of wireless power transmitters excellent in charging efficiency.
It is another object of the present invention to provide a wireless power transmission apparatus for searching for a wireless power transmitter having excellent charging efficiency.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, unless further departing from the spirit and scope of the invention as defined by the appended claims. It will be possible.
A wireless power transmission apparatus according to various embodiments of the present invention includes a first sensor that senses the position of the receiver on a charging pad; A multiplexer for multiplexing and supplying power to at least one wireless power transmitter corresponding to a position of the receiver; And a power conversion unit for controlling the power based on the power transmission efficiency of the at least one wireless power transmitter by the multiplexed power.
It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. And can be understood and understood.
Effects of the method and apparatus according to the present invention will be described as follows.
First, by providing a wireless power transmission apparatus having a plurality of wireless power transmitters excellent in charging efficiency, user convenience and device efficiency can be improved.
Secondly, by providing a wireless power transmission apparatus that searches for a wireless power transmitter having excellent charging efficiency, user convenience and device efficiency can be improved.
The effects obtained by the present invention are not limited to the above-mentioned effects, and other effects not mentioned can be clearly understood by those skilled in the art from the following description will be.
BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. It is to be understood, however, that the technical features of the present invention are not limited to the specific drawings, and the features disclosed in the drawings may be combined with each other to constitute a new embodiment.
Figs. 1 to 4 are views for schematically explaining the operation principle of electromagnetic induction and electromagnetic resonance. Fig.
5 is a system configuration diagram for explaining a wireless power transmission method of an electromagnetic resonance method according to an embodiment.
6 is a view for explaining types and characteristics of a wireless power transmitter in an electromagnetic resonance system according to an embodiment.
7 is a view for explaining types and characteristics of a wireless power receiver in an electromagnetic resonance system according to an embodiment.
8 is an equivalent circuit diagram of a wireless power transmission system in the electromagnetic resonance system according to the embodiment.
9 is a state transition diagram for explaining a wireless power transmitter state transition procedure in the electromagnetic resonance system according to the embodiment.
10 is a state transition diagram of a wireless power receiver supporting an electromagnetic resonance method according to an embodiment.
11 is a view for explaining an operation region of the wireless power receiver according to the rectifier output voltage in the electromagnetic resonance method according to the embodiment.
12 is a diagram for explaining a wireless charging system of an electromagnetic induction type according to an embodiment of the present invention.
13 is a state transition diagram of a wireless power transmitter supporting an electromagnetic induction method according to an embodiment.
14 is a diagram showing an example of a wireless power system in which a plurality of transmitters are provided and which is charged in a magnetic induction manner.
15 to 20 are views showing various forms of the coil according to the embodiment.
21 is a block diagram of a wireless power transmission apparatus having a plurality of wireless power transmitters to which the present invention is applied according to an embodiment.
FIG. 22 is a block diagram further illustrating the wireless power transmission apparatus of FIG. 21. FIG.
23A and 23B show an example of a pulse signal for searching for a wireless power transmitter having excellent charging efficiency.
24 is a diagram showing an example of a wireless power transmission apparatus for adjusting wireless power.
25 is a diagram illustrating a wireless power transmission apparatus according to another embodiment of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an apparatus and various methods to which embodiments of the present invention are applied will be described in detail with reference to the drawings. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role.
While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. That is, within the scope of the present invention, all of the components may be selectively coupled to one or more of them. In addition, although all of the components may be implemented as one independent hardware, some or all of the components may be selectively combined to perform a part or all of the functions in one or a plurality of hardware. As shown in FIG. The codes and code segments constituting the computer program may be easily deduced by those skilled in the art. Such a computer program can be stored in a computer-readable storage medium, readable and executed by a computer, thereby realizing an embodiment of the present invention. As the storage medium of the computer program, a magnetic recording medium, an optical recording medium, a carrier wave medium, or the like may be included.
In the description of the embodiment, in the case of being described as being formed in the "upper or lower", "before" or "after" of each element, (Lower) "and" front or rear "encompass both that the two components are in direct contact with one another or that one or more other components are disposed between the two components.
It is also to be understood that the terms such as " comprises, "" comprising," or "having ", as used herein, mean that a component can be implanted unless specifically stated to the contrary. But should be construed as including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.
In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected to or connected to the other component, It should be understood that an element may be "connected," "coupled," or "connected."
In the description of the embodiments, an apparatus for transmitting wireless power on a wireless power system includes a wireless power transmitter, a wireless power transmitter, a wireless power transmitter, a wireless power transmitter, a transmitter, a transmitter, a transmitter, A wireless power transmission device, a wireless power transmitter, and the like are used in combination.
Also, for the sake of convenience of explanation, it is to be understood that a wireless power receiving apparatus, a wireless power receiving apparatus, a wireless power receiving apparatus, a wireless power receiving apparatus, a receiving terminal, a receiving side, a receiving apparatus, Etc. may be used in combination.
The wireless power transmitter according to the present invention may be configured as a pad type, a cradle type, an access point (AP) type, a small base type, a stand type, a ceiling fill type, a wall type, Can transmit power to a plurality of wireless power receiving apparatuses at the same time.
To this end, the wireless power transmitter may provide at least one wireless power transmission scheme (e.g., including electromagnetic induction, electromagnetic resonance, etc.).
For example, a wireless power transmission scheme may employ a variety of non-electric power transmission standards based on an electromagnetic induction scheme in which a magnetic field is generated in a coil of a power transmission terminal and charged using an electromagnetic induction principle in which electricity is induced in a receiving- . Here, the electromagnetic induction type wireless power transmission standard may include an electromagnetic induction wireless charging technique defined in a Wireless Power Consortium (WPC) or a Power Matters Alliance (PMA).
In another example, the wireless power transmission scheme may employ an electromagnetic resonance scheme in which a magnetic field generated by a transmission coil of a wireless power transmitter is tuned to a specific resonance frequency to transmit power to a nearby wireless power receiver . For example, the electromagnetic resonance method may include a resonance type wireless charging technique defined in Alliance for Wireless Power (A4WP), a wireless charging technology standard organization.
As another example, a wireless power transmission scheme may use an RF wireless power transmission scheme that transmits low power energy to an RF signal and transmits power to a remote wireless power receiver located at a remote location.
According to another embodiment of the present invention, the wireless power transmitter according to the present invention may be designed to support at least two or more wireless power transmission schemes among the electromagnetic induction method, the electromagnetic resonance method, and the RF wireless power transmission method.
In this case, the wireless power transmitter may adaptively transmit the wireless power transmission scheme to be used for the wireless power receiver based on the type, state, required power, etc. of the wireless power receiver as well as the wireless power transmission scheme supported by the wireless power transmitter and the wireless power receiver Can be determined.
In addition, the wireless power receiver according to an exemplary embodiment of the present invention may include at least one wireless power transmission scheme, and may simultaneously receive wireless power from two or more wireless power transmitters. Here, the wireless power transmission method may include at least one of the electromagnetic induction method, the electromagnetic resonance method, and the RF wireless power transmission method.
The wireless power receiver according to the present invention can be used in a mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, a PDA (Personal Digital Assistants), a PMP (Portable Multimedia Player) , A portable toothbrush, an electronic tag, a lighting device, a remote control, a fishing rod, and the like. However, the present invention is not limited thereto. The wireless power receiver according to another embodiment of the present invention can also be mounted on a vehicle, an unmanned aerial vehicle, an air drone or the like.
Figs. 1 to 4 are views for schematically explaining the operation principle of electromagnetic induction and electromagnetic resonance according to the embodiment. Fig.
Referring to FIG. 1, the wireless power transmission system may include a
The
The wireless
The wireless
Both ends of the
The transmission
The reception
Both ends of the
The power generated by the
The above description is only an example, and each of the transmitting apparatus and the receiving apparatus may transmit power in an inductive or resonant manner using a single transmitting / receiving coil.
More specifically, the power transmission process will be described below.
The
The
Thereafter, the power transmitted to the
Power can be transmitted by resonance between two LC circuits whose impedance is matched. Such resonance-based power transmission enables power transmission to be performed at a higher transmission efficiency to a greater extent than the power transmission by the electromagnetic induction method.
The reception
The
The transmitting
The power transmission efficiency between the wireless
The above-mentioned wireless power transmission system explained the power transmission by the resonance frequency method.
In the embodiment, the wireless
The embodiment of the present invention can be applied to electric power transmission by an electromagnetic induction method in addition to the resonance frequency method.
That is, in the embodiment, when the wireless power transmission system performs power transmission based on the electromagnetic induction, the
In wireless power transmission, quality factor and coupling coefficient can have important meaning. That is, the power transmission efficiency can be proportional to the quality index and the coupling coefficient, respectively. Therefore, as the value of at least one of the quality index and the coupling coefficient increases, the power transmission efficiency can be improved.
The quality factor may mean an index of energy that can be accumulated in the vicinity of the wireless
The quality factor may vary depending on the operating frequency (w), the shape of the coil, the dimensions, and the material. The quality index can be expressed by the following equation (1).
[Formula 1]
Q = w * L / R
L is the inductance of the coil, and R is the resistance corresponding to the amount of power loss occurring in the coil itself.
The quality factor can have a value from 0 to infinity. The larger the quality index, the higher the power transmission efficiency between the wireless
Coupling coefficient means the degree of magnetic coupling between the transmitting coil and the receiving coil, and ranges from 0 to 1.
The coupling coefficient may vary depending on the relative position or distance between the transmitting coil and the receiving coil.
2 is an equivalent circuit diagram of a transmission induction coil.
As shown in FIG. 2, the
The
The capacitor C1 may be a variable capacitor, and the impedance matching may be performed as the capacitance of the capacitor C1 is adjusted. The equivalent circuits of the transmission
3 is an equivalent circuit diagram of a power source and a wireless power transmission apparatus according to an embodiment.
3, the
4 is an equivalent circuit diagram of a wireless power receiving apparatus according to an embodiment.
4, the reception
The rectifying
Specifically, the
The rectifier can convert the DC power to the AC power received from the
The smoothing circuit can output smooth DC power by removing the AC component included in the DC power converted in the rectifier. In the embodiment, as the smoothing circuit, as shown in Fig. 4, a rectifying capacitor C5 may be used, but it need not be limited thereto.
The DC power transmitted from the rectifying
The
The wireless
The wireless
In band communication may refer to a communication in which information is exchanged between a wireless
Specifically, the wireless
More specifically, when the switch is opened, the power absorbed by the resistance element becomes zero, and the power consumed by the wireless
When the switch is short-circuited, the power absorbed by the resistance element becomes larger than 0, and the power consumed by the wireless
The wireless
Conversely, it is also possible to transmit the status information of the wireless
Next, out-of-band communication will be described.
Out-of-band communication refers to communication in which information necessary for power transmission is exchanged by using a separate frequency band instead of the resonance frequency band. An out-of-band communication module may be installed in each of the wireless
Although the wireless transmission system has been shown and described briefly as described above, the wireless transmission system will be described in more detail below.
5 is a system configuration diagram for explaining a wireless power transmission method of an electromagnetic resonance method according to an embodiment.
Referring to FIG. 5, the wireless power transmission system may include a
5, the
The
The
The maximum number of
The
The
In particular, the
The
Hereinafter, a wireless power transmission process of a resonance method will be described in more detail with reference to FIG.
The
The
The
The
The
The
The
The
The DC-
The
The monitored output voltage and current intensity information may be transmitted to the
In addition, the
When the system error state is detected, the
5, the
The
6 is a view for explaining types and characteristics of a wireless power transmitter in an electromagnetic resonance method according to an embodiment.
The wireless power transmitter and the wireless power receiver may be classified into a type and a characteristic by a class and a category, respectively. The type and characteristics of the wireless power transmitter can be largely identified through the following three parameters.
First, the wireless power transmitter may be identified by a rating that is determined by the strength of the maximum power applied to the transmit
Here, the rank of the wireless power transmitter is determined by comparing the maximum value of the power (P TX - - IN - COIL ) applied to the transmit
<Table 1>
The grades disclosed in Table 1 above are only examples, and new grades may be added or deleted. It should also be noted that the values for the maximum input power per class, the minimum category support requirements, and the maximum number of devices that can be supported may vary depending on the use, configuration, and implementation of the wireless power transmitter.
For example, with reference to the table 1, the maximum value of P TX _IN_MAX greater than or equal to a value corresponding to
Second, the wireless power transmitter may be identified according to a Minimum Category Support Requirements corresponding to the identified rating.
The minimum category support requirement may be a supportable number of wireless power receivers corresponding to the highest level category of the wireless power receiver category that the wireless power transmitter of that class can support. That is, the minimum category support requirement may be the minimum number of maximum category devices that the wireless power transmitter can support.
At this time, the wireless power transmitter may support all categories of wireless power receivers corresponding to less than the maximum category according to the minimum category requirement.
However, if the wireless power transmitter can support a wireless power receiver of a category higher than the category specified in the minimum category support requirement, then the wireless power transmitter may not limit its support of the wireless power receiver.
As an example, referring to Table 1 above, a wireless power transmitter of
It should also be considered that the wireless power transmitter may support a wireless power receiver with a higher level category if it is determined that it is capable of supporting a higher level category than the category corresponding to the minimum category support requirement.
Third, the wireless power transmitter may be identified by the maximum number of supportable devices corresponding to the identified class. Here, the maximum number of devices that can be supported may be identified by the maximum number of supportable wireless power receivers corresponding to the lowest-level category among the categories that can be supported by the rating - hereinafter simply referred to as the maximum number of supportable devices .
For example, referring to Table 1 above, a
However, when the wireless power transmitter can support more than the maximum number of devices corresponding to its own rating, it does not limit to support more than the maximum number of devices.
The wireless power transmitter according to the present invention must perform at least the wireless power transmission within the available power up to the number defined in Table 1 if there is no particular reason not to allow the power transmission request of the wireless power receiver.
In one example, the wireless power transmitter may not accept a power transfer request for the wireless power receiver if there is not enough available power to accommodate the power transfer request. Alternatively, the power adjustment of the wireless power receiver can be controlled.
In another example, the wireless power transmitter may not accept a power transfer request of the wireless power receiver if the number of acceptable wireless power receivers is exceeded upon accepting the power transfer request.
In another example, the wireless power transmitter may not accept a power transfer request for the wireless power receiver if the category of the wireless power receiver requesting power transmission exceeds a category level that is supported in its rating.
In another example, a wireless power transmitter may not accept a power transfer request from the wireless power receiver if the internal temperature exceeds a reference value.
In particular, the wireless power transmitter according to the present invention can perform the power redistribution procedure based on the current available power amount. At this time, the power redistribution procedure can perform the power redistribution procedure by considering at least one of a category, a wireless power reception state, a required power amount, a priority, and a consumed power amount of a wireless power receiver to be described below.
At least one of the category of the wireless power receiver, the wireless power receiving state, the required power amount, the priority order, and the consumed power amount is transmitted from the wireless power receiver to the wireless power transmitter through at least one control signal through the out- .
When the power redistribution procedure is completed, the wireless power transmitter may transmit the power redistribution result to the corresponding wireless power receiver via out-of-band communication.
The wireless power receiver can recalculate the estimated time required to complete charging based on the received power redistribution result and transmit the re-calculation result to the microprocessor of the connected electronic device. Subsequently, the microprocessor can control the display of the electronic device to display the re-calculated estimated charging completion time. At this time, the displayed estimated charging completion time may be controlled so as to disappear after being displayed on the predetermined time display.
The microprocessor according to another embodiment of the present invention may control to display together information on reasons for re-calculation when re-calculated estimated charging time is re-calculated. To this end, the wireless power transmitter may also transmit information to the wireless power receiver about the reason why the power redistribution occurred when transmitting the power redistribution result.
7 is a view for explaining types and characteristics of a wireless power receiver in an electromagnetic resonance system according to an embodiment.
7, the average output power (P RX - - OUT ) of the receiving
The category of the wireless power receiver may be defined based on the maximum output power (P RX _OUT_MAX ) of the receive
<Table 2>
For example, if the charging efficiency at the bottom stage is 80% or more, the
The categories disclosed in Table 2 above are merely one embodiment, and new categories may be added or deleted. It should also be noted that the maximum output power per category and application examples shown in Table 2 above may also be changed depending on the use, shape and implementation of the wireless power receiver.
8 is an equivalent circuit diagram of a wireless power transmission system in the electromagnetic resonance system according to the embodiment.
8 is an equivalent circuit diagram of a wireless power transmission system supporting an electromagnetic resonance method according to an embodiment of the present invention.
In detail, Fig. 8 shows the interface points on the equivalent circuit in which the reference parameters to be described later are measured.
Hereinafter, the meaning of the reference parameters shown in FIG. 8 will be briefly described.
I TX and I TX _COIL refers to the RMS current supplied to the matching circuit (or a matching network) (720) RMS (Root Mean Square) current and sends a
Z TX _IN means the input impedance of the input impedance of the rear end of the power supply / amplifier /
Z TX - - IN - COIL denotes the input impedance at the end of the
L1 and L2 denote the inductance value of the transmitting
Z RX _IN means the input impedance of the filter / rectifier /
The resonance frequency used in the operation of the wireless power transmission system according to an exemplary embodiment of the present invention may be 6.78 MHz ± 15 kHz, but is not limited thereto.
The wireless power transmission system may provide simultaneous charging (multiple charging) for a plurality of wireless power receivers, in which case the received power variation of the remaining wireless power receivers will not exceed a predetermined reference value Can not be exceeded. For example, the received power variation may be +/- 10%, but is not limited thereto. If it is not possible to control the received power change amount to exceed the reference value, the wireless power transmitter may not accept the power transmission request from the newly added wireless power receiver.
The condition for maintaining the received power variation should not overlap the existing wireless power receiver when the wireless power receiver is added to or removed from the charging area.
When the
The resonator coupling efficiency according to the present invention is calculated by dividing the power transmitted from the receiving resonator coil to the
The table below shows three examples of the minimum resonator matching efficiency according to the class of the wireless power transmitter and the class of the wireless power receiver according to an embodiment of the present invention.
<Table 3>
If a plurality of wireless power receivers are used, the minimum resonator matching efficiency corresponding to the classes and categories shown in Table 3 may increase.
9 is a state transition diagram for explaining a wireless power transmitter state transition procedure in the electromagnetic resonance system according to the embodiment.
9, the state of the wireless power transmitter is divided into a
When power is applied to the wireless power transmitter, the wireless power transmitter may transition to the
In the
Here, the wireless power transmitter can control the beacon sequence to start within a predetermined time after entering the
In the
In particular, the Short Beacon sequence can be repeatedly generated and transmitted at a constant time interval (tCYCLE) during a short interval (tSHORT_BEACON) so that the standby power of the wireless power transmitter can be saved until the wireless power receiver is detected. For example, tSHORT_BEACON may be set to 30 ms or less, and tCYCLE may be set to 250 ms ± 5 ms, respectively. Also, the current intensity of the short beacon is not less than a predetermined reference value, and can be gradually increased for a predetermined time period. In one example, the minimum current intensity of the Short Beacon may be set high enough such that the
The wireless power transmitter according to the present invention may be provided with a sensing means for sensing reactance and resistance change in the reception resonator according to the short beacon.
In addition, in the
That is, the wireless power receiver may broadcast a predetermined response signal over the out-of-band communication channel when booting is completed via the second beacon sequence.
In particular, Long Beacon sequences are generated at a predetermined time interval (t LONG _BEACON_PERIOD) while for a relatively long period (t LONG_BEACON) than the Short Beacon be sent in order to provide sufficient power required by the boot of the wireless power receiver. For example, t LONG _BEACON can be set to 105 ms + 5 ms, and t LONG _BEACON_PERIOD can be set to 850 ms, respectively. The current intensity of the long beacon can be relatively strong compared to the current intensity of the short beacon. Also, the long beacon can maintain the power of a certain intensity during the transmission period.
Thereafter, the wireless power transmitter may wait for the reception of a predetermined response signal during the long beacon transmission interval after the impedance change of the reception resonator is detected. Hereinafter, for convenience of explanation, the response signal will be referred to as an advertisement signal. Here, the wireless power receiver may broadcast an advertisement signal over an out-of-band communication frequency band that is different from the resonant frequency band.
In one example, the advertisement signal includes message identification information for identifying a message defined in the out-of-band communication standard, a unique service for identifying whether the wireless power receiver is legitimate or compatible with the wireless power transmitter, Information on the output power of the wireless power receiver, rated voltage / current information applied to the load, antenna gain information of the wireless power receiver, information for identifying the category of the wireless power receiver, wireless power receiver authentication information, Information about whether or not the wireless power receiver is installed, and software version information mounted on the wireless power receiver.
The wireless power transmitter may establish an out-of-band communication link with the wireless power receiver after transitioning from a
If the wireless power transmitter transmits a predetermined control signal for initiating charging via out-of-band communication in the
If the out-of-band communication link establishment procedure or registration procedure in the
The wireless power transmitter may be driven with a separate Link Expiration Timer for connection to each wireless power receiver and the wireless power receiver may transmit a predetermined message indicating that it is present in the wireless power transmitter at a predetermined time period Should be sent before the link expiration timer expires. The link expiration timer is reset each time the message is received, and the out-of-band communication link established between the wireless power receiver and the wireless power receiver may be maintained if the link expiration timer does not expire.
If all of the link expiration timers corresponding to the out-of-band communication link established between the wireless power transmitter and the at least one wireless power receiver have expired in the
In addition, the wireless power transmitter in
Also, in the
In particular, the wireless power receiver may allow registration of a new wireless power receiver in states other than the
In addition, the wireless power transmitter can dynamically control the transmit power based on state information received from the wireless power receiver in the power transmit
At this time, the receiver status information transmitted from the wireless power receiver to the wireless power transmitter may include information on required power information, voltage and / or current information measured at the rear end of the rectifier, charge status information, overcurrent and / or overvoltage and / Information indicating whether or not the means for interrupting or reducing the electric power delivered to the load in accordance with the information, the overcurrent, or the overvoltage is activated. At this time, the receiver status information may be transmitted at a predetermined period or transmitted every time a specific event is generated. In addition, the means for interrupting or reducing the electric power delivered to the load in accordance with the overcurrent or overvoltage may be provided using at least one of an ON / OFF switch and a zener diode.
The receiver status information transmitted from the wireless power receiver to the wireless power transmitter according to another embodiment of the present invention includes information informing that the external power is connected to the wireless power receiver by wire, information informing that the out-of-band communication method is changed (From Near Field Communication to Bluetooth Low Energy) communication).
In accordance with another embodiment of the present invention, a wireless power transmitter may be configured to determine a power intensity to be received by a wireless power receiver based on at least one of the current available power, the priority of each wireless power receiver, May be adaptively determined. Here, the power intensity by the wireless power receiver can be determined as to how much power should be received in proportion to the maximum power that can be processed by the rectifier of the corresponding wireless power receiver.
The wireless power transmitter may then send a predetermined power control command to the wireless power receiver that includes information regarding the determined power strength. At this time, the wireless power receiver can determine whether power control is possible based on the power intensity determined by the wireless power transmitter, and transmit the determination result to the wireless power transmitter through the predetermined power control response message.
The wireless power receiver according to another embodiment of the present invention may transmit predetermined receiver state information indicating whether wireless power control is possible according to a power control command of the wireless power transmitter before receiving the power control command.
The
In one example, the
The
The
The wireless power transmitter may transition to a
The wireless power transmitter of the
In addition, in the
On the other hand, when transitioning from a state of either the
When the wireless power transmitter transitions to the
For example, the wireless power transmitter may transmit a predetermined power control command to the connected at least one wireless power receiver to reduce the strength of the power received by the wireless power receiver, if an over-current, over-voltage,
In another example, the wireless power transmitter may send a predetermined control command to the connected at least one wireless power receiver to stop the charging of the wireless power receiver if an overcurrent, overvoltage, overheating, or the like is sensed.
Through the above-described power control procedure, the wireless power transmitter can prevent the device from being damaged due to overvoltage, overcurrent, overheat or the like.
The wireless power transmitter can transition to the
On the other hand, if the intensity of the output current of the transmission resonator falls below the reference value within a predetermined time, or the intensity of the output current of the transmission resonator falls below the reference value during the predetermined repetition, the
The wireless power transmitter in the
For example, the Optimal Voltage Region setting parameter may include at least one of a parameter for identifying the low voltage region, a parameter for identifying the optimum voltage region, a parameter for identifying the high voltage region, and a parameter for identifying the overvoltage region .
The wireless power transmitter can increase the transmission power if the power reception state of the wireless power receiver is in the low voltage region, and reduce the transmission power if it is in the high voltage region.
The wireless power transmitter may also control the transmit power to maximize the power transmission efficiency.
The wireless power transmitter may also control the transmit power so that the deviation of the amount of power required by the wireless power receiver is below a reference value.
The wireless power transmitter may also stop transmitting power when the rectifier output voltage of the wireless power receiver reaches a predetermined overvoltage range-that is, when Over Voltage is detected.
10 is a state transition diagram of a wireless power receiver supporting an electromagnetic resonance method according to an embodiment.
10, the state of the wireless power receiver is largely divided into a disable
At this time, the state of the wireless power receiver may be determined based on the intensity of the output voltage at the rectifier end of the wireless power receiver - hereinafter referred to as V RECT for convenience of explanation.
The
The wireless power receiver in the
In the
The wireless power receiver in the
The wireless power receiver of the activated
In addition, the wireless power receiver in the
In addition, the wireless power receiver in the
The wireless power receiver of the
Hereinafter, the state transition of the wireless power receiver in the
11 is a view for explaining an operation region of the wireless power receiver according to the rectifier output voltage in the electromagnetic resonance method according to the embodiment.
Referring to Figure 11, if the V RECT value less than the predetermined V RECT _ BOOT, the wireless power receiver is held in the inactive state (910).
When Thereafter, V RECT value is increased above V RECT _BOOT, the wireless power receiver and changes to the
The wireless power receiver is normally set to communicate the out-of-band link, if a successful registration, V RECT value of the minimum output voltage of the rectifier for a normal charge-to below, for convenience of explanation V RECT _ MIN as business card is reached You can wait until.
When V RECT value exceeds V RECT _MIN, status of the wireless power receiver and transitions to the
If, when the value V RECT in active state (930) exceeds the predetermined threshold value of V RECT _MAX for determining an over-voltage, the wireless power receiver is in the
11, an
In particular, the wireless power receiver transited to the
When the wireless power receiver transitions to
In addition, the wireless power receiver may also control the voltage applied to the load using overvoltage blocking means provided to prevent damage to the load due to the overvoltage in the
Although a method and means for responding to a system error in a wireless power receiver when an overvoltage is generated in the wireless power receiver and transitioned to a
As an example, if the system transitions to a system fault state due to overheating, the wireless power receiver may send a message to the wireless power transmitter indicating the occurrence of overheating. At this time, the wireless power receiver may drive a cooling fan or the like to reduce internally generated heat.
A wireless power receiver according to another embodiment of the present invention may receive wireless power in cooperation with a plurality of wireless power transmitters. In this case, the wireless power receiver may transition to a
12 is a diagram for explaining a wireless charging system of an electromagnetic induction type according to an embodiment of the present invention.
Referring to FIG. 12, an electromagnetic induction type wireless charging system includes a
The
The amount of power transmitted (or increased / decreased) may be controlled using a feedback signal transmitted from the
In the electromagnetic induction method, a frequency modulation method can be used as a protocol for exchanging state information and control signals between the
As shown in FIG. 12, the
The
The operation state of the wireless charging system supporting the electromagnetic induction method can be largely classified into a standby state, a signal detection state, an identification confirmation state, a power transmission state, and a charge completion state. Conversion to different operating states may be accomplished in accordance with the feedback communication result between the
13 is a state transition diagram of a wireless power transmitter supporting an electromagnetic induction method according to an embodiment.
13, the operating state of the wireless power transmitter is largely divided into a standby state (STANDBY) 1110, a signal detection state (PING) 1120, an identification state (IDENTIFICATION) 1130, a power transfer state (POWER TRANSFER) 1140 ) And a state of charge completion (END OF CHARGE, 1150).
Referring to FIG. 13, during a
In the
Also, in the
If a charge complete signal is received from the wireless power receiver, the wireless power transmitter may transition from the
If no response from the wireless power receiver is detected in the signal detection state S1120 - including, for example, when no feedback signal is received for a predetermined time, the wireless power transmitter blocks transmission of the power signal It may transition to the standby state 1110 (S922).
Depending on the wireless power transmitter, the
Unique receiver identification information may be preallocated and maintained for each wireless power receiver and the wireless power receiver needs to inform the wireless power transmitter that it is an appliance that can be charged according to a particular wireless charging technique when a digital ping is sensed. To confirm such receiver identification information, the wireless power receiver may transmit its unique identification information to the wireless power transmitter via feedback communication.
The wireless power transmitter supporting the
In the
If a predetermined charge completion signal is received from the wireless power receiver in the
In addition, if a system error or the like is detected in the
As described above, the wireless power transmitter may transition to the charging completed
If the transition to the charged
If the transition to the charged state (S1150) is due to the internal temperature of the wireless power transmitter, the wireless power transmitter may block the power transmission and monitor the internal temperature change. If the internal temperature falls to a certain range or value, the wireless power transmitter may transition to the signal detection state 1120 (S954). The temperature range or value for changing the state of the wireless power transmitter may vary depending on the manufacturing technology and method of the wireless power transmitter. While monitoring temperature changes, the wireless power transmitter may monitor the charging surface to recognize if the wireless power receiving device is removed. If it is detected that the wireless power receiving device has been removed from the charging surface, the wireless power transmitter may transition to the standby state 1110 (S952). FIG. 14 is a diagram illustrating a wireless Fig. 3 is a diagram showing an example of a power system. Fig.
14, the wireless
Here, the plurality of transmitters include a coil and a power source, respectively, and one of the controllers may be controlled through one controller.
Each of the plurality of power transmitters (1, 1) to (1, 5) may include transmit coils 14-1 to 14-5 and a plurality of first magnets 12-1 to 12-5 . The plurality of transmission coils 14-1 to 14-5 and the plurality of first magnets 12-1 to 12-5 may be disposed adjacent to the upper surface of the
In yet another embodiment, each of the plurality of power transmitters (1, 1) - (1, 5) may comprise transmit coils 14-1 through 14-5 or transmit coil arrays. The transmission coil array is a unit for combining and controlling a plurality of transmission coils. Here, the magnet is excluded from the component.
The transmission coils 14-1 to 14-5 may be the transmission induction coil and / or the transmission resonance coil shown in Fig. For example, in the case of the resonance method, both the transmission induction coil and the transmission resonance coil are used, whereas in the electromagnetic induction type, only the transmission induction coil can be used.
Each of the plurality of transmission coils 14-1 to 14-5 may be disposed so as to surround each of the plurality of first magnets 12-1 to 12-5. For example, the first transmission coil 14-1 may surround the first magnet 12-1, the second transmission coil 14-2 may surround the second magnet 12-2, The third transmission coil 14-3 may surround the third magnet 12-3 and the fourth transmission coil 14-4 may be configured to surround the fourth magnet 12-4, The fifth transmission coil 14-5 may be configured to surround the fifth magnet 12-5. However, since this figure is a sectional view, it is difficult to be displayed on the figure.
The plurality of transmission coils may take various forms and may be arranged in various forms. For example, the plurality of transmitting coils may be arranged in a cell form so as to cover the filling pad without any gap.
Hereinafter, the shape of the coil will be described with reference to FIGS. 15 to 20. FIG.
According to Fig. 15, the transmitting coil can have a hole in the center (Hi to Wi part). The coil may be arranged to surround the center hole (Ho to Wo part). Further, the coil may be arranged so as to surround the center hole (Hi ~ Wi part) with the laminated structure of the transmission coil. It is needless to say that the receiving coil can also be configured as shown in Fig.
According to Fig. 16, the transmitting coil can be constituted of a perforated disc shape. A plurality of coil arrays may be disposed on the disc portion, or stacked coils may be disposed.
According to Fig. 17, the transmitting coil may be composed of a plurality of coil arrays.
According to FIG. 18, the transmission coil may be configured in a cell shape and arranged in an array form.
According to Figs. 19 and 20, the transmission coil may be constituted by a stacked coil. Specifically, the first coil (a) may be disposed at the top, the second coil (b) may be disposed at the middle, and the third coil (c) may be disposed at the bottom. The first to third coils may be arranged so as to be spaced apart from each other. So that even greater power can be delivered to the receiving coil.
The transmitting coils 14-1 to 14-5 have a number of turns and may be spaced apart from each other but are not limited thereto. The transmission coils 14-1 to 14-5 may be arranged so as to be parallel to a virtual horizontal plane. The center region of the transmission coils 14-1 to 14-5 having such a structure may be a vacant space.
Although a plurality of power transmitters ((1, 1) to (1, 5)) have been described as being arranged in a row, this is only an example and a plurality of power transmitters may be constructed in a stacked structure.
The plurality of first magnets 12-1 to 12-5 may be disposed in the central region of the transmission coils 14-1 to 14-5. The thickness of the plurality of first magnets 12-1 to 12-5 may be equal to or greater than or equal to the thickness of the transmitting coils 14-1 to 14-5. According to the intensity of the magnetic flux density required for the plurality of first magnets 12-1 to 12-5 and the occupied area of the magnets 12-1 to 12-5, a plurality of first magnets 12-1 to 12-5 And the areas of the plurality of first magnets 12-1 to 12-5 may be varied.
The wireless
The second magnet may be a configuration for aligning the coils using the second magnet when the wireless power transmission device includes a first magnet and the wireless power transmission device may detect that the wireless power reception device is approaching the charging pad .
In another embodiment of the present invention, the second magnet may not be included. A wireless power receiving apparatus without a magnet can feedback the signal strength received through a receiving coil to perform at least one operation such as alignment of a receiving coil or selection of an active transmitting coil, detection of a wireless power receiver, and the like. Also, the wireless power receiving apparatus can be detected in the wireless power transmitting apparatus due to a change in the current generated when the wireless power receiving apparatus rises on the charging pad.
Although the wireless
The wireless
The receiving coil may be the receiving resonant coil and / or the receiving induction coil shown in Fig. For example, both the reception resonant coil and the reception induction coil are used in the case of the resonance method, whereas only the reception induction coil can be used in the electromagnetic induction method.
The receiving coil may be arranged to surround the second magnet. The receiving coil may have several turns and may be spaced between adjacent receiving coils. The receiving coil may be arranged so as to be parallel to the imaginary horizontal plane. The central region of the receiving coil having such a structure may be a blank space.
The second magnet may be disposed in the central region of the receiving coil. The central region of the receiving coil may be smaller than the central region of the transmitting coils 14-1 to 14-5, but this is not limited thereto. The thickness of the second magnet may be equal to or greater than or less than the thickness of the receiving coil. The thickness of the second magnet and the area of the second magnet may vary depending on the intensity of the magnetic flux density required for the second magnet and the occupied area of the second magnet.
The second magnet allows the proximity or contact of the wireless
For this detection, the
The Hall sensors 16-1 to 16-5 detect only the intensity of the magnetic flux density of the first magnets 12-1 to 12-5 when the wireless
Therefore, the
Alternatively, the wireless
Although the Hall sensors 16-1 to 16-5 are described as being disposed between the upper surface of the
To this end, the second magnet may be made of a material which induces a variation range (?) Of the magnetic flux density exceeding the threshold value. For example, the threshold may be 32G. The threshold required in the standard may be 40G.
The second magnet may be an electrical sheet. For example, the electrical steel sheet may contain at least 1% to 5% silicon (Si), but the invention is not limited thereto. The silicon content of the second magnet may be varied so that the variation range (alpha) of the magnetic flux density exceeding the threshold value required by the standard or the customer is caused.
For example, the receiving coil and the second magnet may be attached to the back surface of the shielding member using an adhesive. A printed circuit board on which electronic components including a power source, an ac power generating unit, and a control unit are mounted may be disposed on the shielding member.
The shield member shields the magnetic field induced by the coil so that the magnetic field does not affect the electronic component, thereby preventing malfunction of the electronic component.
The
21 is a block diagram of a wireless power transmission apparatus having a plurality of wireless power transmitters to which the present invention is applied according to an embodiment.
21, the wireless
The power generated by the
The
In addition, the
The
The
The
FIG. 22 is a block diagram further illustrating the wireless power transmission apparatus of FIG. 21. FIG.
According to FIG. 22, the wireless
The first sensor 1440-1 functions as the
The first sensor 1440-1 may specify the wireless power transmitter and may transmit specific information to the
The second sensor 1440-2 may receive an Alignment with a predetermined level from the
Here, the power transmitter having an excellent alignment means a power transmitter having the largest magnetic field size formed with the
The second sensor can receive the required charging information from the
In yet another embodiment, the second sensor may sense the area of the
In another embodiment, the second sensor may determine the charging efficiency of each of the wireless power transmitters and transmit it to
In addition, the second sensor 1440-2 may select the transmitter to transmit the radio power and transmit the selection information to the
It is assumed that the first sensor 1440-1 transmits specific information to the
23A, the first sensor 1440-1 senses the position of the
According to Figure 23 (b), the second sensor 1440-2 detects the first, second, and fifth transmitters 1450-1, 1450-2, and 1450-5 that are aligned with the
At this time, the
Also, the
The
The
Although the plurality of amplifiers 1460-1 to 1460-n are described separately from the
24 is a diagram showing an example of a wireless power transmission apparatus for adjusting wireless power.
According to FIG. 24, a particular or selected transmitter from the first sensor 1440-1 and the second sensor 1440-2 may transmit power to the
At this time, the
25 is a diagram illustrating a wireless power transmission apparatus according to another embodiment of the present invention.
Here, the electromagnetic
The wireless
The plurality of transmitters 1840-1 to 1840-5 generate an alternating current by the alternating current power supplied from the
The
The
The transmission &
The transmitting communication &
The
A wireless
The wireless power transmission / reception scheme described above can transmit / receive wireless power using an electromagnetic induction scheme or an electromagnetic resonance scheme, and can use the scheme at an intersection during transmission and reception. In addition, the wireless power transmission /
It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. Accordingly, the above description should not be construed in a limiting sense in all respects and should be considered illustrative. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the scope of equivalents of the present invention are included in the scope of the present invention.
The method according to the above-described embodiments may be implemented as a program to be executed by a computer and stored in a computer-readable recording medium. Examples of the computer-readable recording medium include a ROM, a RAM, a CD- , A floppy disk, an optical data storage device, and the like, and may also be implemented in the form of a carrier wave (for example, transmission over the Internet).
The computer readable recording medium may be distributed over a networked computer system so that computer readable code can be stored and executed in a distributed manner. And, functional program, code, and code segments for implementing the above-described method can be easily inferred by programmers in the technical field to which the embodiment belongs.
It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.
Accordingly, the above description should not be construed in a limiting sense in all respects and should be considered illustrative. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the scope of equivalents of the present invention are included in the scope of the present invention.
Wireless power transmitter: 200, 500
Wireless power receiving apparatus: 300, 600
Claims (16)
A first sensor for sensing a position of the receiver on the charging pad;
A multiplexer for multiplexing and supplying power to at least one wireless power transmitter corresponding to a position of the receiver; And
And a power conversion unit for controlling the power based on the power transmission efficiency of the at least one wireless power transmitter by the multiplexed power.
Wherein the first sensor comprises:
Wherein the receiver senses the position of the receiver through a change in magnetic flux density or a change in impedance when the receiver approaches the charging pad.
Wherein the first sensor comprises:
And transmits the specific information to the multiplexer by specifying at least one wireless power transmitter corresponding to the position of the receiver.
Wherein the first sensor comprises:
And generates the specific information in the form of a pulse signal and transmits the specific information to the multiplexer.
And a second sensor for selecting a wireless power transmitter that satisfies a predetermined level of alignment with the receiver among the at least one wireless power transmitter corresponding to the position of the receiver and transmitting selection information to the power conversion unit Gt;
Wherein the second sensor comprises:
And generates the selection information in the form of a pulse signal and transmits the selection information to the power conversion unit.
And at least one amplifier corresponding to each of the at least one wireless power transmitter,
Wherein the at least one amplifier is coupled to the multiplexer.
Wherein the power conversion unit comprises:
And differentially adjusts the power of each of the wireless power transmitters based on a share of the area of the receiver.
Sensing a position of the receiver on the charging pad;
Multiplexing and supplying power to at least one wireless power transmitter corresponding to a position of the receiver; And
And controlling the power based on the power transmission efficiency of the at least one wireless power transmitter based on the multiplexed power.
Wherein the sensing comprises:
Wherein the position of the receiver is sensed through a change in magnetic flux density or a change in impedance when the receiver approaches the charging pad.
Wherein the sensing comprises:
Further comprising: identifying at least one wireless power transmitter corresponding to a position of the receiver, and providing specific information to the multiplexer.
Wherein the step of providing to the multiplexer comprises:
And generating the specific information in the form of a pulse signal and providing the specific information to the multiplexing unit.
Selecting a wireless power transmitter that satisfies a predetermined level of alignment with the receiver among at least one wireless power transmitter corresponding to the position of the receiver and transmitting the selection information to the power conversion unit, A method of controlling a power transmitting device.
Wherein the step of transmitting to the power conversion unit comprises:
Generating the selection information in the form of a pulse signal, and transmitting the selection information to the power conversion unit.
And at least one amplifier corresponding to each of the at least one wireless power transmitter,
Wherein the at least one amplifier is coupled to the multiplexer.
The step of controlling the power comprises:
And differentially adjusts the power of each of the wireless power transmitters based on the occupancy of the area of the receiver.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150120759A KR20170024999A (en) | 2015-08-27 | 2015-08-27 | Wireless power transmitting apparatus and method for controlling the same |
| PCT/KR2016/007638 WO2017034154A1 (en) | 2015-08-27 | 2016-07-14 | Wireless power transmission device and method for controlling same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| KR1020150120759A KR20170024999A (en) | 2015-08-27 | 2015-08-27 | Wireless power transmitting apparatus and method for controlling the same |
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| KR20170024999A true KR20170024999A (en) | 2017-03-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| KR1020150120759A KR20170024999A (en) | 2015-08-27 | 2015-08-27 | Wireless power transmitting apparatus and method for controlling the same |
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| KR (1) | KR20170024999A (en) |
| WO (1) | WO2017034154A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20180114452A (en) * | 2017-04-10 | 2018-10-18 | 엘지전자 주식회사 | Washing machine and Controlling method therefor |
| US11515715B2 (en) | 2018-07-16 | 2022-11-29 | Samsung Electronics Co., Ltd. | Electronic device for receiving wireless power and method for wireless charging thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20130045087A (en) | 2011-10-25 | 2013-05-03 | 삼성전기주식회사 | Multi-apparatus for wireless charging and manufacturing method thereof |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013035188A1 (en) * | 2011-09-08 | 2013-03-14 | 富士通株式会社 | Transmitting device, receiving device, and non-contact charging method |
| EP2747245A1 (en) * | 2011-09-21 | 2014-06-25 | Toyota Jidosha Kabushiki Kaisha | Contactless power transmission device, contactless power receiving device and contactless power transceiver system |
| WO2013098947A1 (en) * | 2011-12-27 | 2013-07-04 | 中国電力株式会社 | Contactless power supply system, power supply device, and method for controlling contactless power supply system |
| KR20130121466A (en) * | 2012-04-27 | 2013-11-06 | 한국전자통신연구원 | Apparatus and method for transmitting wireless energy in energy transmission system |
| KR101555577B1 (en) * | 2013-12-30 | 2015-09-24 | 전자부품연구원 | Method of transfering wireless power |
-
2015
- 2015-08-27 KR KR1020150120759A patent/KR20170024999A/en unknown
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20130045087A (en) | 2011-10-25 | 2013-05-03 | 삼성전기주식회사 | Multi-apparatus for wireless charging and manufacturing method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20180114452A (en) * | 2017-04-10 | 2018-10-18 | 엘지전자 주식회사 | Washing machine and Controlling method therefor |
| US11515715B2 (en) | 2018-07-16 | 2022-11-29 | Samsung Electronics Co., Ltd. | Electronic device for receiving wireless power and method for wireless charging thereof |
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