Wireless power transmitter, wireless power repeater and wireless power transmission method
First Claim
1. A wireless power transmitter comprising:
- a power supply unit for outputting AC power;
a transmission coil for receiving the AC power to generate a time-variable magnetic field using the AC power;
a transmission resonant coil unit for transmitting power received from the transmission coil coupled with the transmission resonant coil;
a repeater resonant unit for transmitting power received from the transmission resonant coil coupled with the repeater resonant unit, wherein the repeater resonant unit includes a plurality of repeater resonant coils having different resonance frequencies from each other; and
a control unit configured to;
change a power level of the AC power to a micro power level;
change a frequency of the AC power to the each different resonance frequency sequentially in a predetermined period;
compare an internal current value with a threshold value for the each different resonance frequency;
determine a first resonance frequency at which the internal current value is not higher than the threshold value, wherein the first resonance frequency corresponds to one of resonance frequencies of the plurality of repeater resonant coils;
change the power level of the AC power to a power higher than the micro power level; and
change a frequency of the AC power to the first resonance frequency.
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Accused Products
Abstract
Disclosed is a wireless power transmitter which wirelessly transmits power through a wireless power repeater to a wireless power receiver using resonance. The wireless power transmitter includes a power supply unit for outputting AC power having a predetermined frequency, a transmission coil for receiving the AC power to generate a time-variable magnetic field, and a transmission resonant coil unit for transmitting power received from the transmission coil coupled with the transmission resonant coil, wherein the wireless power transmitter determines a resonance frequency for a power transmission while controlling a frequency of the AC power output from the power supply unit and a resonance frequency of the transmission resonant coil unit.
13 Citations
9 Claims
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1. A wireless power transmitter comprising:
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a power supply unit for outputting AC power; a transmission coil for receiving the AC power to generate a time-variable magnetic field using the AC power; a transmission resonant coil unit for transmitting power received from the transmission coil coupled with the transmission resonant coil; a repeater resonant unit for transmitting power received from the transmission resonant coil coupled with the repeater resonant unit, wherein the repeater resonant unit includes a plurality of repeater resonant coils having different resonance frequencies from each other; and a control unit configured to; change a power level of the AC power to a micro power level; change a frequency of the AC power to the each different resonance frequency sequentially in a predetermined period; compare an internal current value with a threshold value for the each different resonance frequency; determine a first resonance frequency at which the internal current value is not higher than the threshold value, wherein the first resonance frequency corresponds to one of resonance frequencies of the plurality of repeater resonant coils; change the power level of the AC power to a power higher than the micro power level; and change a frequency of the AC power to the first resonance frequency. - View Dependent Claims (2, 3, 4, 5, 9)
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6. A wireless power transmission method, comprising:
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providing a wireless power transmitter and a wireless power repeater including a plurality of repeater resonant coils, wherein the plurality of repeater resonant coils have different resonance frequencies from each other; outputting AC power; changing a power level of the AC power to a micro power level; changing a frequency of the AC power to each resonance frequency sequentially in a predetermined period; transmitting the micro power level having frequencies with a predetermined frequency interval to the wireless power repeater at the predetermined time period; detecting an internal current value of the wireless power transmitter according to the transmitted micro power; comparing the internal current value with a threshold value for the each resonance frequency; determining a first resonance frequency at which the internal current value is not higher than the threshold value, wherein the first resonance frequency corresponds to one of resonance frequencies of the plurality of repeater resonant coils; changing the power level of the AC power to a power higher than the micro power level; changing a frequency of the AC power to the first resonance frequency; and transmitting the AC power to the wireless power repeater using the first resonance frequency. - View Dependent Claims (7, 8)
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Specification