Abstract:
A wireless power reception apparatus includes a reception (RX) resonator configured to form a resonance coupling with a first resonance period associated with an envelope of a power to receive the power from a transmission (TX) resonator; a switch controller configured to generate, at intervals of the first resonance period, a control signal to deactivate the RX resonator at an off timing corresponding to a time instant at which a maximum energy is stored in an inductor of the RX resonator; and a switch configured to deactivate the RX resonator in response to the control signal.
Abstract:
A wireless power transmission apparatus includes a resonator configured to transmit power through a resonance with another resonator, a switch configured to connect the resonator to a power source, a setting unit configured to set a target amount of current to flow in the resonator, and a control unit configured to control the switch based on the target amount of current.
Abstract:
Provided are a method and apparatus for wirelessly transmitting energy. A wireless energy transmitter may perform sampling to obtain first samples from an alternating current (AC) signal that is induced at an energy transmission (TX) end, and may correct symbol synchronization based on a difference between a sum of absolute values of the first samples and a sum of absolute values of second samples sampled during a symbol interval in which synchronization matching is performed between a switch of the energy TX end and a switch of the energy RX end.
Abstract:
A wireless power transmission apparatus includes a resonator configured to transmit power to another resonator, and a power supply unit configured to supply power to the resonator. The apparatus further includes a switching unit including a transistor configured to be turned on to connect the power supply unit to the resonator, and to be turned off to disconnect the power supply unit from the resonator, based on a control signal, and a diode connected in series to the transistor.
Abstract:
A wireless energy reception apparatus includes a target resonator configured to receive energy on a frame-by-frame basis from an energy transmission end through a resonance with a source resonator in a symbol duration constituting a criterion for transmitting energy from the energy transmission end to an energy reception end; a load end configured to receive power from the target resonator; a switching unit configured to connect the target resonator to the load end, and disconnect the target resonator from the load end; and a controller configured to control symbol synchronization by detecting a start point of a symbol based on a distance between the source resonator and the target resonator.
Abstract:
Aspects of the subject disclosure may include, for example, a method and apparatus for measuring a bioimpedance and performing an electrical stimulation. The method includes generating a first current corresponding to a first high-frequency, generating a second current corresponding to a second high-frequency, generating a low-frequency current based on a beat phenomenon of the first current and the second current, and calculating an impedance of a target part based on a voltage induced to the target part by a high-frequency current corresponding to at least one of the first current and the second current and the low-frequency current.
Abstract:
A single-inductor multiple-output (SIMO) converter includes a converter configured to provide respective voltages of a plurality of channels with a single inductor and a control logic configured to control switches of the converter based on clocks corresponding to the plurality of channels, wherein the control logic is configured to compare an output voltage of a selected channel of the plurality of channels that corresponds to a control target to a reference voltage of the selected channel based on a clock of the selected channel and operate in one of a first mode that adaptively adjusts a number of times that a pulse triggering a power transfer to the channel is generated, and a second mode that blocks a generation of the pulse.
Abstract:
A wireless communication apparatus may include: an oscillator including a coil assembly exposed to an outside of the wireless communication apparatus, a variable capacitor, and a negative resistor; and a phase locking circuit connected to the coil assembly and the negative resistor. The phase locking circuit may be configured to generate a control signal to lock an oscillation frequency of the oscillator based on an oscillation signal generated by the oscillator, and provide the generated control signal to the variable capacitor.
Abstract:
A boost converter and a cell applicable to the boost converter are provided. The cell comprises a control circuit configured to generate a bottom control signal related to a bottom plate of a capacitor, and a top control signal related to a top plate of the capacitor to connect the capacitor based on one or more operational phases, and a booster configured to convert the top control signal generated by the control circuit, wherein the capacitor is configured to be sequentially connected to voltage levels through switches, based on the bottom control signal and the converted top control signal.
Abstract:
A wireless power transmission system includes: a wireless power transmission apparatus including: a transmission coil configured to form mutual coupling with an auxiliary coil disposed outside of a living body; and a controller configured to control a supply of power by a power source to the transmission coil to wirelessly transmit the power from the transmission coil, using the auxiliary coil, to a wireless power reception apparatus disposed inside the living body through the mutual coupling, wherein a distance between the transmission coil and the auxiliary coil is adjustable.