摘要:
Provided are a wireless power transmission receiver and a system including the same, particularly to a receiver and transmitter transmitting power from one transmitter to a plurality of receivers at the same time by wireless. According to the present invention, the wireless power receiver comprises a receiving coil unit receiving power from a transmitter by a resonance coupling method; and a power receiving unit receiving power from the receiving coil unit to provide the power to a load resistor, wherein an input impedance of the power receiving unit is adjusted according to power consumed by a plurality of receivers. Therefore, power transmission efficiency of the wireless power receiver and transmitter can be improved.
摘要:
Provided is a wireless power transfer device. The wireless power transfer device includes an power generator, and two or more non-radiative electromagnetic wave generators. The power generator generates AC type of power. The non-radiative electromagnetic wave generators receive the power, and generate non-radiative electromagnetic waves through resonance. The non-radiative electromagnetic wave generators are disposed to form a wireless power transfer-enabled transfer area.
摘要:
Disclosed is a wireless power transmitting and receiving device which includes a wireless power receiving device comprising a receiving coil configured to receive a non-radiated electromagnetic wave; and a frequency adjusting unit configured to adjust a resonant frequency of the receiving coil and a wireless power transmitting device comprising a transmission coil configured to generate a non-radiated electromagnetic wave by magnetic induction with a power coil; and a frequency adjusting unit configured to adjust a resonant frequency of the transmission coil. The frequency adjusting unit adjusts a resonant frequency of the receiving coil by closing a surroundings of the receiving coil by a magnetic sheet. The frequency adjusting unit adjusts a resonant frequency of the transmission coil by inserting a magnetic sheet in the transmission coil.
摘要:
A power transmitter includes a signal processor that externally obtains a reception power state signal depending on variation of a distance between transmission and reception coil units, a modulation controller configured to a modulation frequency for selecting a frequency band having maximum power transmission performance, based on the reception power state signal, a power signal generator that generates a power signal, and a modulator that modulates the power signal in response to the modulation frequency, the reception coil unit being configured to transmit the modulated signal. A power receiver includes a reception coil unit that receives a power signal, a power generator that generates power by receiving the power signal from the reception coil unit, and a signal generator that generates a reception power state signal depending on the generated power level and transmits the latter signal to a transmission coil unit corresponding to the reception coil unit.
摘要:
Provided are a fall detecting apparatus and method and an emergency aid system and method using the same. The fall detecting apparatus includes a storing unit configured to store fall data vectors; an angular velocity measuring unit configured to measure an angular velocity value; an acceleration measuring unit configured to measure an acceleration value; an acceleration extracting unit configured to extract a kinetic acceleration value and a gravitational acceleration value by filtering the acceleration value measured by the acceleration measuring unit; and a fall determining unit configured to convert the angular velocity value, which is measured by the angular velocity measuring unit, and the kinetic acceleration value and the gravitational acceleration value, which are extracted by the acceleration extracting unit, into a fall data vector, and determine a use's fall by comparing the converted fall data vector with the fall data vector stored in the storing unit.