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US 10,181,756 B2Granted
Wireless power transmitter and power transmission method thereof
AssigneeLG Innotek Co., Ltd.
InventorsSu Ho Bae, Ki Min Lee
Life of this patent
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Abstract
Disclosed are a wireless power transmitter and a power transmission method thereof. The wireless power transmitter includes a plurality of transmission resonance units, a detection power applying unit applying detection power to the transmission resonance units to detect a location of the wireless power receiver, and a current measuring unit measuring current generating from an inner part of the wireless power transmitter based on the applied detection power. The wireless power transmitter transmits the power through at least one transmitting resonance unit corresponding to the location of the wireless power receiver based on the measured current.
Claims10
A wireless power transmitter for wirelessly transmitting power to a wireless power receiver, the wireless power transmitter comprising:
- a plurality of transmission resonance coils, each having a resonance frequency identical to that of the wireless power receiver;
- a power supply unit;
- a detection power applying unit;
- a measuring unit;
- a switch unit connected to the plurality of transmission resonance coils;
- and
- a controller configured:
- to control the detection power applying unit and the switch unit to sequentially supply a detection power having a first frequency to each of the plurality of transmission resonance coils, the first frequency being identical to the resonance frequency of each of the transmission resonance coils,
- to control the measuring unit to measure a value of a current of each of the transmission resonance coils,
- to compare the measured current value of each of the transmission resonance coils to a threshold current value,
- to determine whether a location of at least one transmission resonance coil of the plurality of transmission resonance coils corresponds to a location of the wireless power receiver based on whether the measured current values of the transmission resonance coils are equal to or greater than the threshold current value, and
- to control the power supply unit and the switch unit to supply a charging power having a second frequency to the determined at least one transmission resonance coil for charging of the wireless power receiver, the second frequency being a mutual-change resonance frequency changed from a resonance frequency due to a mutual inductance component between the respective transmission resonance coil and the wireless power receiver, the at least one transmission resonance coil being determined according to whether the measured current values are equal to or greater than the threshold current value,
- wherein each of the plurality of transmission resonance coils comprises a variable capacitor for changing the resonance frequency of the transmission resonance coils,
- wherein the threshold value is a minimum current value required to detect the wireless power receiver location,
- wherein the plurality of transmission resonance coils is disposed on a pad in which the plurality of transmission resonance coils is divided and arranged in regions having an equal area, and
- wherein the switch unit is disposed outside the pad.
13 more elements
A method of a wireless power transmitter for wirelessly transmitting power to a wireless power receiver to detect and charge the wireless power receiver, comprising:
- sequentially applying a detection power having a first frequency to each of a plurality of transmission resonance coils, each of the plurality of transmission resonance coils having a resonance frequency identical to that of the wireless power receiver, and the first frequency being identical to the resonance frequency of each of the transmission resonance coils;
- measuring a value of a current of each of the transmission resonance coils;
- comparing the measured current value of each of the transmission resonance coils to a threshold current value;
- and
- determining whether a location of at least one transmission resonance coil of the plurality of transmission resonance coils corresponds to a location of the wireless power receiver, based on whether the measured current values of the transmission resonance coils are equal to or greater than the threshold current value;
- and
- supplying a charging power having a second frequency to the determined at least one transmission resonance coil for charging of the wireless power receiver, the second frequency being a mutual-change resonance frequency changed from a resonance frequency due to a mutual inductance component between the respective transmission resonance coil and the wireless power receiver, the at least one transmission resonance coil being determined according to whether the measured current values are equal to or greater than the threshold current value,
- wherein each of the plurality of transmission resonance coils comprises a variable capacitor for changing a resonance frequency of the transmission resonance coils,
- wherein a power having the second frequency for charging of the wireless power receiver is applied,
- wherein an impedance variance is generated by the wireless power receiver,
- wherein the second frequency is applied to the at least one of the plurality of transmission resonance coils having a location corresponding to the location of the wireless power receiver after the first frequency is applied, and
- wherein the plurality of transmission resonance coils is disposed on a pad in which the plurality of transmission resonance coils is divided and arranged in regions having an equal area.
9 more elements
Dependencies are inferred from the claim text.