WO2013095067A1 - 무선 전력전송장치 및 방법 - Google Patents
무선 전력전송장치 및 방법 Download PDFInfo
- Publication number
- WO2013095067A1 WO2013095067A1 PCT/KR2012/011323 KR2012011323W WO2013095067A1 WO 2013095067 A1 WO2013095067 A1 WO 2013095067A1 KR 2012011323 W KR2012011323 W KR 2012011323W WO 2013095067 A1 WO2013095067 A1 WO 2013095067A1
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- WIPO (PCT)
- Prior art keywords
- power
- power transmission
- signal
- receiving device
- control unit
- Prior art date
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 243
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000004804 winding Methods 0.000 claims abstract description 28
- 238000013021 overheating Methods 0.000 claims description 17
- 238000001514 detection method Methods 0.000 claims description 10
- 238000010586 diagram Methods 0.000 description 6
- 230000008054 signal transmission Effects 0.000 description 3
- 230000005674 electromagnetic induction Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
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Classifications
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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
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/80—Circuit arrangements or systems for wireless supply or distribution of electric power involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/14—Inductive couplings
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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
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
-
- 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
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
-
- 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
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/90—Circuit arrangements or systems for wireless supply or distribution of electric power involving detection or optimisation of position, e.g. alignment
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/20—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by the transmission technique; characterised by the transmission medium
- H04B5/24—Inductive coupling
- H04B5/26—Inductive coupling using coils
- H04B5/263—Multiple coils at either side
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
- H04B5/79—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for data transfer in combination with power transfer
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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
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
-
- 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
-
- 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
- H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
- H02J7/00034—Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
Definitions
- the present invention relates to a wireless power transmitter and method for wirelessly transmitting power to a power receiver.
- various portable terminals such as mobile phones and PDAs (Personal Digital Assistants) are equipped with power receivers for supplying operating power.
- PDAs Personal Digital Assistants
- the power receiving device is to charge the power supplied from an external charging device, and to operate by supplying the charged power to the portable terminal as operating power.
- the power receiving device inputs a battery cell module that charges power, and power supplied from the external charging device to charge the battery cell module, and discharges the power charged in the battery cell module to operate the portable terminal. It may include a charge and discharge circuit and the like.
- a terminal connection method for directly connecting a terminal for outputting power from the charging device and a terminal for inputting power from the power receiving device through cables and connectors is known. have.
- Terminals for outputting power from the charging device and terminals for inputting power from the power receiving device have different potential differences.
- This momentary discharge wears down the terminals of the charging device and the terminals of the power receiving device.
- a safety accident such as a fire due to heat generated from the foreign matter due to the instantaneous discharge phenomenon.
- the power charged in the battery cell module of the power receiving device due to moisture, etc. is naturally discharged to the outside through the terminals of the power receiving device, thereby shortening the service life of the power receiving device and causing a decrease in performance. there was.
- the wireless power transmitter transmits power wirelessly using, for example, an electromagnetic induction method.
- the power receiving device receives power transmitted by the wireless power transmitter wirelessly and charges the received power in the battery cell module.
- the wireless power transmitter is wirelessly stable and transmits power with high efficiency.
- the power receiver is capable of receiving the maximum power transmitted by the wireless power transmitter to charge the battery cell module. I'm trying.
- An object of the present invention is to provide a wireless power transmission apparatus and method for wirelessly transmitting power to a power receiving device with high transmission efficiency.
- the wireless power transmitter of the present invention includes a first power transmission coil for transmitting a first power signal, a second power transmission coil stacked concentrically with the first power transmission coil, and a second power transmission coil for transmitting a second power signal;
- the power supply unit may supply an AC power to the first power transmission coil and the second power transmission coil such that the first power signal and the second power signal have a phase difference of 180 °.
- the first and second power transmission coils have the same size and the same number of turns, the winding directions are opposite to each other, and the power supply unit includes: a power transmission control unit generating one pulse width modulation (PWM) control signal; AC power is generated according to the one PWM control signal, and the generated AC power is applied to the first and second power transmission coils to generate a first power signal and a second power signal having a phase difference of 180 °.
- PWM pulse width modulation
- the driving driver may further include a driving driver amplifying the PWM control signal and outputting the PWM control signal to the series resonant converter between the power transmission control unit and the series resonant converter.
- the power supply unit may further include a signal detection unit configured to receive charge state signals transmitted by the power receiving device through the first and second power transmission coils, and output the same to the power transmission control unit.
- a signal detection unit configured to receive charge state signals transmitted by the power receiving device through the first and second power transmission coils, and output the same to the power transmission control unit.
- the power transmission control unit may adjust the amount of power transmitted to the power receiving device by adjusting the frequency of the PWM control signal.
- the power supply unit may further include a signal detection unit configured to receive charge state signals transmitted by the power receiving device through the first and second power transmission coils, and output the same to the power transmission control unit.
- the state signal may determine whether the power charging of the power receiving device is completed, and stop the power transmission when the power charging is completed.
- the first and second power transmission coils have the same size and the same number of turns, have the same winding direction, and the power supply unit has two pulse width modulations (PWMs) having the same frequency and a phase difference of 180 °.
- PWMs pulse width modulations
- the apparatus may further include a driving driver between the power transmission control unit and the first and second series resonant converters to amplify the two PWM control signals, respectively, and output the amplified two PWM control signals to the first and second series resonant converters. .
- the power supply unit may further include a signal detection unit configured to receive charge state signals transmitted by the power receiving device through the first and second power transmission coils, and output the same to the power transmission control unit.
- a signal detection unit configured to receive charge state signals transmitted by the power receiving device through the first and second power transmission coils, and output the same to the power transmission control unit.
- the power transmission control unit may adjust the amount of power by adjusting the frequency or phase of the PWM control signal.
- the power supply unit may further include a signal detection unit configured to receive charge state signals transmitted by the power receiving device through the first and second power transmission coils, and output the same to the power transmission control unit.
- the state signal may determine whether the power charging of the power receiving device is completed, and stop the power transmission when the power charging is completed.
- the first and second power transmission coils have the same size and the same number of turns, the winding directions are opposite to each other, and the power supply unit generates two PWM (Pulse Width Modulation) control signals having the same frequency and phase.
- a first and a second series resonant converter for generating alternating current power having the same frequency and phase according to the two PWM control signals and applying the same to the first and second power transmission coils. have.
- the power supply unit may further include a signal detection unit configured to receive charge state signals transmitted by the power receiving device through the first and second power transmission coils, and output the same to the power transmission control unit.
- a signal detection unit configured to receive charge state signals transmitted by the power receiving device through the first and second power transmission coils, and output the same to the power transmission control unit.
- the power transmission control unit may adjust the amount of power by adjusting the frequency or phase of the PWM control signal.
- the power transmission control unit determines whether or not to transmit power wirelessly to the power receiving device, and if the power transmission control unit can wirelessly transmit power to the power receiving device, Generating a PWM control signal for power transmission, and according to the PWM control signal, the stacked first and second power transmission coils respectively generate first and second power signals having a phase difference of 180 ° therebetween. And wirelessly transmitting power to the power receiving device.
- the stacked first and second power transmission coils to generate the first and second power signals having a phase difference of 180 degrees to each other to wirelessly transmit power to the power receiving device, Generating first and second power signals having a phase difference of 180 ° by applying alternating current power having the same phase to the first and second power transmission coils having the same size and the same number of windings and having opposite winding directions; It may include.
- the stacked first and second power transmission coils to generate the first and second power signals having a phase difference of 180 degrees to each other to wirelessly transmit power to the power receiving device, Generating first and second power signals having a phase difference of 180 ° by applying AC power having a phase difference of 180 ° to the first and second power transmission coils having the same size and the same number of windings and having the same winding direction, respectively. It may include a step.
- the wireless power transmission method of the present invention the step of the power transmission control unit inputs a charge state signal transmitted by the power receiving device, and when the charge state signal includes the overheat information, the power transfer control unit is the first
- the method may further include adjusting the amount of power transmitted from the first and second power transmission coils to the power receiving device.
- the power transmission controller may control the amount of power transmitted from the first and second power transmission coils to the power receiving device. And adjusting the amount of power wirelessly transmitted to the power receiving device.
- the step of adjusting the amount of power transmitted from the first and second power transmission coil to the power receiving device when the charge state signal includes the overheat information, the first and second power transmission coil Adjusting the phase of the generated first and second power signal may include adjusting the amount of power transmitted to the power receiving device.
- the first power transmission coil and the second power transmission coil are the same size, the same number of windings are stacked concentrically, and the first power signal having a phase difference of 180 ° between each other and A second power signal is generated to wirelessly transmit power to the power receiving device.
- the present invention provides the first power signal and the first power signal generated in the first power transmission coil and the second power transmission coil, respectively.
- the amplitude of the sum of the two power signals is about two times larger, and thus the amount of power wirelessly transmitted to the power receiving device is increased by about four times.
- FIG. 1 is a block diagram showing the configuration of an embodiment of a wireless power transmission system equipped with a wireless power transmission apparatus of the present invention
- Figure 2 is a block diagram showing the configuration of another embodiment of a wireless power transmission system equipped with a wireless power transmission apparatus of the present invention.
- FIG. 3 is a signal flow diagram showing the operation according to the wireless power transmission method of the present invention.
- FIG. 1 is a block diagram showing the configuration of an embodiment of a wireless power transmission system equipped with a wireless power transmission apparatus of the present invention.
- reference numeral 100 denotes an AC / DC converter.
- the AC / DC converter 100 converts AC power input from the outside into DC power and supplies the converted DC power as operating power.
- Numeral 200 is a wireless power transmission apparatus according to the present invention.
- the wireless power transmitter 200 operates with DC power supplied from the AC / DC converter 100.
- the wireless power transmitter 200 generates AC power by switching the DC power supplied by the AC / DC converter 100, and wirelessly transmits the generated AC power using, for example, an electromagnetic induction method. do.
- the AC / DC converter 100 and the wireless power transmitter 200 are described separately as an example, but in the embodiment of the present invention, the AC / DC is connected to the wireless power transmitter 200.
- the converter 100 may be configured to be integrally provided.
- Reference numeral 300 denotes a power receiver.
- the power receiver 300 receives and charges the power transmitted by the wireless power transmitter 200 wirelessly, and supplies the charged power to the portable terminal as operating power.
- the power receiving apparatus 300 transmits a unique ID signal stored in advance to the wireless power transmitter 200 in response to a request of the wireless power transmitter 200.
- the power receiving device 300 when receiving power, the power receiving device 300 generates a charge state signal including a power amount signal for notifying charge amount of power and overheat information for notifying occurrence of overheating, and generating the charge state signal.
- the wireless power transmitter 200 transmits the data.
- the wireless power transmitter 200 has a first power transmission coil 210-1 for transmitting a first power signal, the same size and the same number of turns as the first power transmission coil 210-1, and The first power transmission coil 210-1 and the winding direction are opposite to each other and are stacked concentrically to the second power transmission coil 210-2 for transmitting a second power signal, the first power signal and the first
- the power supply unit 220 may supply AC power having the same phase to the first power transmission coil 210-1 and the second power transmission coil 210-2 so that the second power signal has a phase difference of 180 °. have.
- the power supply unit 220 may include a power transmission control unit 221, a drive driver 223, a series resonant converter 225, a first signal transmitter 227, and a first signal receiver 229. It may include.
- the power transmission control unit 221 requests an ID signal from the power receiver 300 and generates a control signal when the ID signal is received from the power receiver 300 to wirelessly power the power receiver 300. Control what is sent. For example, the power transmission control unit 221 generates a pulse width modulation (PWM) control signal to control the wireless transmission of power to the power receiver 300. Also, the power transmission control unit 221 determines whether overheating occurs in the power receiving device 300, and when the overheating is determined, adjusts the frequency and phase of the PWM control signal to the power receiving device 300. Controls the amount of power transmitted wirelessly.
- PWM pulse width modulation
- the driving driver 223 amplifies the PWM control signal generated by the power transmission control unit 221.
- the series resonant converter 225 generates AC power by switching DC power supplied by the AC / DC converter 100 according to the PWM control signal amplified by the driving driver 223, and generates AC power. Is output to the first and second power transmission coils 210.
- the first signal transmitter 227 generates an ID request signal for requesting the ID of the power receiver 300 under the control of the power transmission controller 221 to generate the first and second power transmission coils 210-. 1, 210-2 to transmit to the power receiving device 300.
- the first signal receiver 229 receives the ID signal and the charging state signal transmitted by the power receiver 300 through the first and second power transmission coils 210-1 and 210-2 to transmit the power. Output to the control unit 221.
- the power receiver 300 includes a power receiving control unit 302, a power receiving coil 304, a rectifying unit 306, a charging unit 308, a battery cell module 310, a temperature sensor 312, and a second signal receiving unit 314. ) And the second signal transmitter 316.
- the power reception control unit 302 controls the wireless power transmitter 200 to receive and charge the power transmitted wirelessly. In addition, the power reception control unit 302 controls to transmit the ID signal to the wireless power transmitter 200 when an ID request signal is received. In addition, the power receiving control unit 302 transmits a power level signal for notifying the power charging amount of the battery cell module 310 and a charging state signal including overheating information of the battery cell module 310 to the wireless power transmitter 200. Control what is sent.
- the power receiving coil 304 receives power transmitted by the wireless power transmitter 200 wirelessly.
- the rectifier 306 converts the power received by the power receiving coil 304 into DC power.
- the charging unit 308 charges the DC power converted by the rectifying unit 306 to the battery cell module 310 under the control of the power receiving control unit 302.
- the temperature sensor 312 detects a temperature of the battery cell module 310 and outputs the temperature to the power reception control unit 302.
- the second signal receiving unit 314 receives the ID request signal transmitted by the wireless power transmitter 200 through the power receiving coil 304 and outputs it to the power receiving control unit 302.
- the second signal transmitter 316 transmits an ID signal and a charging information signal to the wireless power transmitter 200 through the power receiver coil 304 under the control of the power receiver controller 302.
- the AC / DC converter 100 converts AC power input from the outside into DC power, and supplies the converted DC power to the wireless power transmitter 200 as operating power.
- the wireless power transmitter 200 may load a load on the first and second power transmission coils 210-1 and 210-2, for example, the power receiving coil 304 of the power receiver 300. It must be determined whether it is placed.
- the power transmission control unit 221 of the power supply unit 220 generates a control signal for detecting a change in load.
- Control signals for detecting a change in the load are amplified by the driving driver 223 and input to the series resonant converter 225.
- the series resonant converter 225 generates AC power by switching the DC power output from the AC / DC converter 100 according to the control signal, and the generated AC power transmits the first and second power. Applied to the coils 210-1 and 210-2.
- control signal for detecting a change in the load is a signal of a frequency at which resonance does not occur in the first and second power transmission coils 210-1 and 210-2, for example, as high as about 180 Hz. Has a frequency.
- the series resonant converter 225 generates AC power by switching DC power according to a control signal for detecting a change in load, and the generated AC power is the first and second power transmission coils 2100-1. Is applied to the 210-2, the resonance is not generated in the first and second power transmission coil (210-1, 210-2), the power consumption is very low, the power is not transmitted wirelessly.
- the first signal receiver 229 receives the signals of the first and second power transmission coils 210-1 and 210-2, and outputs the received signals to the power transmission controller 221.
- the power transmission controller 221 determines whether a load variation occurs using the frequency of the received signal input from the first signal receiver 229.
- the first and second power transmission coils 210-1 and 210-2 are applied to the first and second power transmission coils 210-1 and 210-2.
- the frequency of AC power does not change.
- the first and second power transmission coils 210-1 and 210-2 and the power receiving device 300 are separated.
- Mutual impedance is generated between the power receiving coils 304, and the frequency of the AC power applied to the first and second power transmission coils 210-1 and 210-2 is changed by the generated mutual impedance. Done.
- the power transmission control unit 221 determines whether the frequency of the signal input from the first signal receiving unit 229 is changed, and when the frequency is changed, the first and second power transmission coils 210-1, It is determined that a predetermined load such as the power receiving device 300 is placed on the upper portion of the 210-2.
- the power transmission controller 221 must determine whether the load is the power receiving device 300.
- the power transmission control unit 221 controls the first signal transmission unit 227 to generate an ID request signal for requesting the ID signal of the power receiving device 300, the generated ID request signal is the first and second 2 is transmitted to the power receiving device 300 through the power transmission coil (210-1, 210-2).
- the transmitted ID request signal is received by the second signal receiver 314 through the power receiver coil 304, and the received ID request signal is input to the power receiver controller 302.
- the power reception control unit 302 controls the second signal transmission unit 316 according to the ID request signal to generate its own ID signal, and the generated ID signal is transmitted through the power reception coil 304.
- the wireless power transmitter 200 is transmitted.
- the wireless power transmitter 200 receives an ID signal transmitted from the power receiver 300 by the first signal receiver 229 through the first and second power transmission coils 210-1 and 210-2. It is input to the power transmission control unit 221.
- the power transmission control unit 211 is an ID signal input from the first signal receiving unit 229 and the power receiving device 300 which is not a foreign material on the first and second power transmission coils 210-1 and 210-2.
- the power transmission control unit 211 wirelessly transmits a control signal for transmitting power. That is, a PWM control signal is generated, and the generated PWM control signal is amplified by the driving driver 223 and then input to the series resonant converter 225.
- the series resonant converter 225 generates AC power by switching DC power according to the PWM control signal, and the generated AC power is applied to the first and second power transmission coils 210-1 and 210-2. Is approved.
- the first and second power transmission coils 210-1 and 210-2 are designed to resonate, for example, at 100 Hz, and the power transmission control unit 221 has a PWM control having a frequency of 100 Hz. Generate a signal.
- the series resonant converter 225 switches the DC power in accordance with the PWM control signal to generate AC power having a frequency of 100 kHz, and the AC power having the frequency of 100 kHz is the first and second. Since it is applied to the power transmission coils 210-1 and 210-2, resonance occurs in the first and second power transmission coils 210-1 and 210-2.
- the series resonant converter 225 applies AC power having the same phase to the first and second power transmission coils 210-1 and 210-2, but the first and second power transmission coils ( Since the 210-1 and 210-2 have the same size and the same number of windings, and the winding directions are opposite to each other and are stacked concentrically, the first and second power transmission coils 210-1 and 210-2 are mutually stacked. Generate first and second power signals, each having a phase difference of 180 degrees.
- the amplitude of the sum of the first and second power signals is more than doubled, and thus the power receiver 300 ), The amount of power transmitted wirelessly will increase approximately 4 times.
- the power transmitted by the first and second power transmission coils 210-1 and 210-2 wirelessly is received by the power receiving coil 304 of the power receiving device 300, and the rectifying unit 306 receives the received power.
- the charging unit 308 charges the battery cell module 310 by converting the DC power and converting the converted DC power under the control of the power reception control unit 302.
- the temperature sensor 312 detects the temperature of the battery cell module 310, and the power reception controller 302 overheats the battery cell module 310 at a temperature detected by the temperature sensor 312. It is determined whether or not this has occurred.
- the power reception control unit 302 determines the power charging state of the battery cell module 550 through the charging unit 308.
- the power reception controller 302 generates and generates a charge state signal including overheat information indicating whether overheating has occurred in the battery cell module 310 and charging information of the battery cell module 550.
- the charging state signal is transmitted to the wireless power transmitter 200 through the second signal transmitter 316 and the power receiver coil 304.
- the charging state signal transmitted by the power receiver 300 is received by the first signal receiver 229 through the first and second power transmission coils 210-1 and 210-2 of the wireless power transmitter 200. To the power transmission control unit 221.
- the power transmission control unit 221 analyzes the state of charge signal to determine whether overheating or charging is complete.
- the power transmission control unit 221 adjusts the frequency of the PWM control signal.
- the AC power applied to the first and second power transmission coils 210-1 and 210-2 is adjusted by adjusting the frequency of the PWM control signal. Slightly out of the resonance point of 210-2, the amplitude of the first power signal and the second power signal is reduced.
- the amount of power received by the power receiving coil 304 is reduced, thereby reducing the amount of power charged in the battery cell module 310 to prevent overheating.
- the power transmission control unit 221 When the power charging of the battery cell module 310 is completed, the power transmission control unit 221 does not generate a PWM control signal, and thus, the first and second power transmission coils 210- may be analyzed. In 1, 210-2, power is not wirelessly transmitted to the power receiving coil 304.
- FIG. 2 is a block diagram showing the configuration of another embodiment of a wireless power transmission system equipped with a wireless power transmission apparatus of the present invention.
- the power transmission control unit 221 generates two PWM control signals.
- the first driving driver 223-1 and the second driving driver 223-2 amplify two PWM control signals generated by the power transmission control unit 221, and the first and second driving drivers 223-1 and 223-1.
- the first series resonant converter 225-1 and the second series resonant converter 225-2 generate AC power to generate the first and the second power. 2 was configured to apply to the power transmission coil (210-1, 210-2), respectively.
- the first and second power transmission coils 210-1 and 210-2 are wound in the same size, the same number of windings, and the same winding direction, and are stacked concentrically.
- the power transmission control unit 221 when power is transmitted to the power receiving device 300, the power transmission control unit 221 generates two PWM control signals having a phase difference of 180 °.
- the two PWM control signals having the phase difference of 180 ° are amplified by the first and second driving drivers 223-1 and 223-2, respectively, so that the first and second series resonant converters 225-1 and 225-2 are respectively amplified. ) Is entered.
- the first and second series resonant converters 225-1 and 225-2 switch DC power with two PWM control signals having a phase difference of 180 ° to generate AC power having a phase difference of 180 ° from each other.
- the generated AC power is applied to the first and second power transmission coils 210-1 and 210-2, respectively.
- the first and second power transmission coils 210-1 and 210-2 are wound in the same size, the same number of windings, and the same winding direction, and are stacked concentrically. As described above, AC power having a phase difference of 180 ° is applied to the first and second power transmission coils 210-1 and 210-2.
- the first power signal generated by the first power transmission coil 210-1 and the second power signal generated by the second power transmission coil 210-2 have a phase difference of 180 ° between each other.
- the amplitude of the sum of the first and second power signals is increased by two times or more, so that the amount of power wirelessly transmitted to the power receiver 300 is increased by about four times.
- the first and second power transmission coils 210-1 and 210-2 may have the same size and the same number of windings, and may be wound in different directions and stacked concentrically.
- the power transmission control unit 221 generates two PWM control signals having the same phase and the same frequency, and the first and second power transmission coils 210-1 and 210- are generated by the two PWM control signals. 2) AC power having the same frequency and phase is applied to generate the first and second power signals having a phase difference of 180 ° with each other.
- the power transmission controller 221 adjusts the frequency of the PWM control signal or controls two PWMs. Adjust so that the phase of the signal does not become 180 °.
- the AC power applied to the first and second power transmission coils 210-1 and 210-2 is adjusted by adjusting the frequency of the PWM control signal. Slightly out of the resonance point of 210-2, the amplitude of the first power signal and the second power signal is reduced.
- the phases of the first and second power signals generated by the first and second power transmission coils 210-1 and 210-2 are not exactly 180 °.
- the amount of power received by the power receiving coil 304 is reduced, thereby reducing the amount of power charged in the battery cell module 310 to prevent overheating.
- FIG. 3 is a signal flow diagram showing the operation of the power transmission control unit 221 according to the wireless power transmission method of the present invention.
- the power transmission control unit 221 generates a control signal for detecting a change in load (S400).
- the control signal is amplified by the first and second driving drivers 223-1 and 223-2, respectively, and is input to the first and second series resonant converters 225-1 and 225-2.
- the second series resonant converters 225-1 and 225-2 generate AC power by switching DC power output from the AC / DC converter 100 according to the control signal, and the generated AC power is the first.
- the second power transmission coils 210-1 and 210-2 are the second power transmission coils 210-1 and 210-2.
- the first signal receiver 229 receives the signals of the first and second power transmission coils 210-1 and 210-2, and outputs the received signals to the power transmission controller 221.
- the power transmission control unit 221 detects the frequency of the signal input from the first signal receiving unit 229 to determine whether or not the load variation occurs (S402).
- the power transmission control unit 221 returns to step S400 to generate a control signal for detecting the load change, and the first signal receiving unit 229 The operation of detecting whether a load variation has occurred by detecting a frequency of a received signal is repeatedly performed.
- the power transmission control unit 221 controls the first signal transmission unit 227 to provide an ID request signal for requesting an ID signal of the power receiving device 300.
- the generated ID request signal is transmitted to the power receiving device 300 through the first and second power transmission coils 210-1 and 210-2 (S404).
- the power transmission control unit 221 inputs the reception signal of the first signal receiving unit 229 to determine whether the ID signal of the power receiving device 300 is received (S406).
- the power transmission control unit 221 determines whether a predetermined time has elapsed (S408).
- step S406 If the predetermined time has not elapsed as a result of the determination, the process returns to step S406 and repeatedly determines whether an ID signal is received.
- control unit 221 repeatedly returns to step S400 from an operation of generating a control signal for detecting a change in load.
- the power transmission control unit 221 When the ID signal is received before a preset time elapses, the power transmission control unit 221 has a phase difference of 180 ° between the first and second power transmission coils 210-1 and 210-2.
- the first and second power signals are generated to wirelessly transmit power to the power receiving device 300 (S410).
- the first power transmission coil 210-1 and the second power transmission coil 210-2 have the same size and the same number of turns, and the winding directions are opposite to each other.
- the power transfer control unit 221 When stacked concentrically, the power transfer control unit 221 generates one PWM control signal, and the first power transfer coil 210-1 and the second power transfer coil 210 are generated by the generated PWM control signal. AC power of the same phase is applied to -2) to generate the first and second power signals having a phase difference of 180 ° from each other.
- the power transfer control unit 221 when the first power transmission coil 210-1 and the second power transmission coil 210-2 are stacked concentrically with the same size, the same number of windings, and the same winding direction.
- the power transfer control unit 221 generates two PWM control signals having the same frequency and having a phase difference of 180 °, and transmits the first power transfer coil 210-1 and the second power by the two PWM control signals.
- AC power having a phase difference of 180 ° is applied to the coil 210-2 to generate first and second power signals having a phase difference of 180 ° between each other.
- the first power transmission coil 210-1 and the second power transmission coil 210-2 have the same size and the same number of turns, and the winding directions are opposite to each other and are stacked concentrically.
- the power transmission control unit 221 generates two PWM control signals having the same frequency and phase, and generates the first power transmission coil 210-1 and the second power transmission coil by the two PWM control signals.
- AC power having a phase difference of 180 ° is applied to 210-2 to generate the first and second power signals having a phase difference of 180 ° from each other.
- the power transmission control unit 221 inputs a charging state signal transmitted by the power receiving device 300 through the first signal receiving unit 229, and analyzes the input charging state signal to receive the power receiving device 300. It is determined whether overheating) or the charging of the power is completed (S412, S414).
- the power transmission control unit 221 adjusts the frequency or phase of the PWM control signal to control the first and second power transmission coils (S416).
- the power transmission control unit 221 determines whether the power charging of the power receiving device 300 is completed (S418).
- the power transmission control unit 221 ends the operation of transmitting power to the power receiving device 300.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
Description
Claims (20)
- 제 1 전력신호를 전송하기 위한 제 1 전력전송코일;상기 제 1 전력전송코일과 동심으로 적층되고, 제 2 전력신호를 전송하기 위한 제 2 전력전송코일; 및상기 제 1 전력신호와 상기 제 2 전력신호가 180°의 위상차를 갖도록 상기 제 1 전력전송코일 및 제 2 전력전송코일에 교류전력을 공급하는 전력공급부;를 포함하는 무선 전력전송장치.
- 제 1 항에 있어서,상기 제 1 및 제 2 전력전송코일은,동일한 크기 및 동일한 권선수를 갖고, 권선방향이 서로 반대방향이고,상기 전력 공급부는,하나의 PWM(Pulse Width Modulation) 제어신호를 발생하는 전력전송 제어부; 및상기 하나의 PWM 제어신호에 따라 교류전력을 발생하고, 발생한 교류전력을 상기 제 1 및 제 2 전력전송코일에 인가하여 180°의 위상차를 가지는 제 1 전력신호 및 제 2 전력신호가 발생되게 하는 직렬 공진형 컨버터;를 포함하는 무선 전력전송장치.
- 제 2 항에 있어서,상기 전력전송 제어부와 상기 직렬 공진형 컨버터의 사이에,상기 PWM 제어신호를 증폭하여 상기 직렬 공진형 컨버터로 출력하는 구동 드라이버;를 더 포함하는, 무선 전력전송장치.
- 제 2 항에 있어서,상기 전력 공급부는,상기 수전장치가 전송하는 충전상태신호를 상기 제 1 및 제 2 전력전송 코일을 통해 수신하여 상기 전력전송 제어부로 출력하는 신호 검출부를 더 포함하고,상기 전력전송 제어부는,상기 충전상태신호에 과열정보가 포함되어 있을 경우에 상기 제 1 및 제 2 전력전송 코일로부터 상기 수전장치로 전송되는 전력량을 조절하는, 무선 전력전송장치.
- 제 4 항에 있어서,상기 전력전송 제어부는,상기 PWM 제어신호의 주파수를 조절하여 상기 수전장치로 전송되는 전력량을 조절하는, 무선 전력전송장치.
- 제 3 항에 있어서,상기 전력 공급부는,상기 수전장치가 전송하는 충전상태신호를 상기 제 1 및 제 2 전력전송 코일을 통해 수신하여 상기 전력전송 제어부로 출력하는 신호 검출부를 더 포함하고,상기 전력전송 제어부는,상기 충전상태신호로 상기 수전장치의 전력 충전이 완료되었는지의 여부를 판단하고, 전력 충전이 완료되었을 경우에 전력 전송을 정지하는, 무선 전력전송장치.
- 제 1 항에 있어서,상기 제 1 및 제 2 전력전송 코일은,동일한 크기 및 동일한 권선수를 갖고, 권선방향이 서로 동일하고,상기 전력 공급부는,주파수가 동일하고 180°의 위상차를 갖는 2개의 PWM(Pulse Width Modulation) 제어신호를 발생하는 전력전송 제어부; 및상기 2개의 PWM 제어신호에 따라 주파수가 동일하고 위상차가 180°인 교류전력을 각기 발생하여 상기 제 1 및 제 2 전력전송코일에 인가하는 제 1 및 제 2 직렬 공진형 컨버터;를 포함하는 무선 전력전송장치.
- 제 7 항에 있어서,상기 전력전송 제어부와 상기 제 1 및 제 2 직렬 공진형 컨버터의 사이에,상기 2개의 PWM 제어신호를 각기 증폭하여 상기 제 1 및 제 2 직렬 공진형 컨버터로 출력하는 구동 드라이버;를 더 포함하는, 무선 전력전송장치.
- 제 7 항에 있어서,상기 전력 공급부는,상기 수전장치가 전송하는 충전상태신호를 상기 제 1 및 제 2 전력전송 코일을 통해 수신하여 상기 전력전송 제어부로 출력하는 신호 검출부를 더 포함하고,상기 전력전송 제어부는,상기 충전상태신호에 과열정보가 포함되어 있을 경우에 상기 제 1 및 제 2 전력전송 코일로부터 상기 수전장치로 전송되는 전력량을 조절하는, 무선 전력전송장치.
- 제 9 항에 있어서,상기 전력전송 제어부는,상기 PWM 제어신호의 주파수 또는 위상을 조절하여 전력량을 조절하는, 무선 전력전송장치.
- 제 7 항에 있어서,상기 전력 공급부는,상기 수전장치가 전송하는 충전상태신호를 상기 제 1 및 제 2 전력전송 코일을 통해 수신하여 상기 전력전송 제어부로 출력하는 신호 검출부를 더 포함하고,상기 전력전송 제어부는,상기 충전상태신호로 상기 수전장치의 전력 충전이 완료되었는지의 여부를 판단하고, 전력 충전이 완료되었을 경우에 전력 전송을 정지하는, 무선 전력전송장치.
- 제 1 항에 있어서,상기 제 1 및 제 2 전력전송코일은,동일한 크기 및 동일한 권선수를 갖고, 권선방향이 서로 반대방향이고,상기 전력 공급부는,주파수 및 위상이 동일한 2개의 PWM(Pulse Width Modulation) 제어신호를 발생하는 전력전송 제어부; 및상기 2개의 PWM 제어신호에 따라 주파수 및 위상이 동일한 교류전력을 각기 발생하여 상기 제 1 및 제 2 전력전송코일에 인가하는 제 1 및 제 2 직렬 공진형 컨버터;를 포함하는 무선 전력전송장치.
- 제 12 항에 있어서,상기 전력 공급부는,상기 수전장치가 전송하는 충전상태신호를 상기 제 1 및 제 2 전력전송 코일을 통해 수신하여 상기 전력전송 제어부로 출력하는 신호 검출부를 더 포함하고,상기 전력전송 제어부는,상기 충전상태신호에 과열정보가 포함되어 있을 경우에 상기 제 1 및 제 2 전력전송 코일로부터 상기 수전장치로 전송되는 전력량을 조절하는, 무선 전력전송장치.
- 제 13 항에 있어서,상기 전력전송 제어부는,상기 PWM 제어신호의 주파수 또는 위상을 조절하여 전력량을 조절하는, 무선 전력전송장치.
- 전력전송 제어부가 수전장치에 무선으로 전력을 전송할 수 있는지의 여부를 판단하는 단계;상기 수전장치에 무선으로 전력을 전송할 수 있을 경우에 상기 전력전송 제어부가 전력 전송을 위한 PWM 제어신호를 발생하는 단계; 및상기 PWM 제어신호에 따라, 적층된 제 1 및 제 2 전력전송코일이 상호간에 180°의 위상차를 가지는 제 1 및 제 2 전력신호를 각기 발생하여 상기 수전장치에 무선으로 전력을 전송하는 단계;를 포함하는 무선 전력전송방법.
- 제 15 항에 있어서,상기 PWM 제어신호에 따라, 적층된 제 1 및 제 2 전력전송코일이 상호간에 180°의 위상차를 가지는 제 1 및 제 2 전력신호를 각기 발생하여 상기 수전장치에 무선으로 전력을 전송하는 단계는,동일한 크기 및 동일한 권선수를 갖고, 권선방향이 서로 반대방향인 제 1 및 제 2 전력전송코일에 동일 위상의 교류전력을 인가하여 180°의 위상차를 가지는 제 1 및 제 2 전력신호를 발생하는 단계;를 포함하는 무선 전력전송방법.
- 제 15 항에 있어서,상기 PWM 제어신호에 따라, 적층된 제 1 및 제 2 전력전송코일이 상호간에 180°의 위상차를 가지는 제 1 및 제 2 전력신호를 각기 발생하여 상기 수전장치에 무선으로 전력을 전송하는 단계는,동일한 크기 및 동일한 권선수를 갖고, 권선방향이 동일한 제 1 및 제 2 전력전송코일에 180°의 위상차를 가지는 교류전력을 각기 인가하여 180°의 위상차를 가지는 제 1 및 제 2 전력신호를 발생하는 단계;를 포함하는 무선 전력전송방법.
- 제 15 항에 있어서,상기 수전장치가 전송하는 충전상태신호를 상기 전력전송 제어부가 입력하는 단계; 및상기 충전상태신호에 과열 정보가 포함되어 있을 경우에 상기 전력전송 제어부가 상기 제 1 및 제 2 전력전송 코일로부터 상기 수전장치로 전송되는 전력량을 조절하는 단계;를 더 포함하는 무선 전력전송방법.
- 제 18 항에 있어서,상기 충전상태신호에 과열 정보가 포함되어 있을 경우에 상기 전력전송 제어부가 상기 제 1 및 제 2 전력전송 코일로부터 상기 수전장치로 전송되는 전력량을 조절하는 단계는,상기 전력전송 제어부가 상기 PWM 제어신호의 주파수를 조절하여 상기 수전장치에 무선으로 전송되는 전력량을 조절하는 단계;를 포함하는 무선 전력전송방법.
- 제 19 항에 있어서,상기 충전상태신호에 과열 정보가 포함되어 있을 경우에 상기 전력전송 제어부가 상기 제 1 및 제 2 전력전송 코일로부터 상기 수전장치로 전송되는 전력량을 조절하는 단계는,상기 제 1 및 제 2 전력전송 코일이 발생하는 제 1 및 제 2 전력신호의 위상을 조절하여 상기 수전장치로 전송되는 전력량을 조절하는 단계;를 포함하는 무선 전력전송방법.
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US14/367,891 US9391463B2 (en) | 2011-12-22 | 2012-12-21 | Device and method for wirelessly transmitting power |
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Also Published As
Publication number | Publication date |
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KR20140107305A (ko) | 2014-09-04 |
KR102109989B1 (ko) | 2020-05-13 |
US20150022147A1 (en) | 2015-01-22 |
US9391463B2 (en) | 2016-07-12 |
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