Wireless power transmitter and method for wirelessly transmitting power
AssigneeSamsung Electro-Mechanics Co., Ltd.
InventorsSang Hyun MIN, Jung Tae KIM, Jung Hyun KIM
Life of this patent
Estimating the term…
Abstract
A wireless power transmitter includes a converter configured to output an alternating current (AC) voltage in response to a transmission control signal; a power transmitter including a power transmitting coil and configured to vary an impedance in response to a resonance control signal, and to receive the AC voltage to wirelessly transmit power; and a controller configured to determine whether a wireless power receiver is present while varying the transmission control signal and the resonance control signal.
Claims20
A wireless power transmitter comprising:
- a converter configured to output an alternating current (AC) voltage in response to a transmission control signal;
- a power transmitter comprising a power transmitting coil and configured to vary an impedance in response to a resonance control signal, and to receive the AC voltage to wirelessly transmit power;
- and
- a controller configured to determine whether a wireless power receiver is present while varying the transmission control signal and the resonance control signal.
A method for wirelessly transmitting power, the method comprising:
- determining whether a wireless power receiver is present while varying either one or both of an impedance and a capacitance of a power transmitter receiving an alternate current (AC) voltage to wirelessly transmit power;
- and
- in response to the determination that the wireless power receiver is present, wirelessly transmitting the power to the wireless power receiver.
A wireless power transmitter, comprising:
- a switching circuit;
- a variable resonance circuit;
- a power transmitting coil;
- and,
- a transmission controller coupled to the power transmitting coil, the switching circuit, and the variable resonance circuit, the transmission controller being configured to identify a substantially maximum sensed voltage by:
- adaptively actuating the switching circuit to vary an operating frequency of a power supply and supply power to the power transmitting coil, and
- adaptively actuating the variable resonance circuit to vary an impedance in response to a voltage sensed across the power transmitting coil while the power is supplied thereto.
A method for wirelessly transmitting power, comprising:
- actuating a power transmission coil to transmit wireless power;
- actuating a controller coupled to the power transmission coil to:
- determine a voltage at a sensor coupled to the power transmission coil,
- vary a resonance frequency of the transmission coil until a substantially optimal voltage is identified;
- actuate the power transmission coil to transmit wireless power for a predetermined time at the resonance frequency corresponding with the substantially optimal voltage while awaiting wireless reception of a data packet.
Dependencies are inferred from the claim text.