Abstract: A wireless power reception device includes a first resonant circuit having a first resonant frequency; a second resonant circuit connected in parallel with the first resonant circuit and having a second resonant frequency; and a rectifier configured to receive power received wirelessly by either one or both of the first resonant circuit and the second resonant circuit to output a charging current.

Abstract: An electronic component includes a first capacitor including a first dielectric material having a permittivity that is inversely proportional to temperature; and a second capacitor connected in parallel with the first capacitor and including a second dielectric material having a permittivity that is directly proportional to temperature.

Abstract: There is provided a non-contact type charger including: a plurality of power transmitting coils transmitting power in a non-contact manner; a plurality of switching units connected to the plurality of power transmitting coils, respectively, to switch power transmitted by corresponding power transmitting coils; and a switching control unit controlling power switching of the switching units, depending on coupling coefficients between each of the plurality of power transmitting coils and a plurality of power receiving coils which receive the power transmitted by the plurality of power transmitting coils to charge a plurality of battery cells connected thereto with power.

Abstract: A wireless power transmitter includes: a current adjuster configured to convert an input power into a transmission current, which is periodically varied according to a transmission frequency; and a power transmitter configured to receive the transmission current and wirelessly transmit power according to the transmission frequency.

Abstract: Provided herein is a fusion energy extraction circuit (FEEC) device having a grid-tied bidirectional converter and a resonant converter. The resonant converter can include an inverse cyclotron converter with two or more or quadruple plates and a plurality of circuit switches. The bidirectional converter can include a three-phase grid-tied converter. The FEEC device is capable of decelerating plasma particle beams, thereby extracting the energy from the deceleration, converting the extracted energy to electric energy, and sending the electric energy to a power grid.

Abstract: A non-contact type power charger may include: a power transmitting device including a plurality of power transmitting coils transmitting power in a non-contact manner; and a power receiving device including a plurality of power receiving coils receiving the power in a non-contact manner to charge a plurality of battery cells, respectively connected to the plurality of power receiving coils, with the power, wherein the power transmitted to each of the plurality of power receiving coils is controlled depending on coupling coefficients between the plurality of power transmitting coils and the plurality of power receiving coils.

Abstract: A wireless power transmitter includes a switch circuit including switches connected to a transmission resonator; a current detector configured to detect a transient current induced in the transmission resonator; and a controller configured to control the switch circuit and adjust an output of the wireless power transmitter based on an amplitude of the transient current.

Abstract: A wireless power reception device includes a first resonant circuit having a first resonant frequency; a second resonant circuit connected in parallel with the first resonant circuit and having a second resonant frequency; and a rectifier configured to receive power received wirelessly by either one or both of the first resonant circuit and the second resonant circuit to output a charging current.

Abstract: A wireless power transmitting device includes: a rectifier configured to rectify alternating current (AC) power; a capacitor configured to store the rectified AC power as direct current (DC) power; a voltage divider configured to divide a voltage of the DC power; and a wireless power transmitter configured to wirelessly transmit power using the voltage divided by the voltage divider.

Abstract: A non-contact type power receiver may includes: a plurality of power receiving coils receiving power in a non-contact manner; a plurality of rectifying units switching to rectify the power received from the plurality of power receiving coils; and a control unit controlling the switching by the plurality of rectifying units to control respective levels of the power rectified by the plurality of rectifying units.

Abstract: Provided are a piezoelectric energy harvester and a wireless switch including the piezoelectric energy harvester. The wireless switch uses energy generated in a piezoelectric energy harvester as a source of driving power, thereby transmitting communications signals to an external electronic device without requiring a battery. In addition, the piezoelectric energy harvester generates displacement in a piezoelectric element through a magnetic force generated in a magnet, thereby generating a constant level of energy when generating the driving power.

Abstract: There is provided a wireless switch including: an energy harvesting unit generating a first signal and a second signal when a first button is pressed and when the first button is released, respectively; a measuring unit measuring a period of time from a time at which the first signal is generated to a time at which the second signal is generated; and a wireless signal transmitting unit transmitting a control signal depending on the period of time measured by the measuring unit.

Abstract: A wireless power transmitter includes: a switching unit configured to receive a direct current (DC) voltage and to perform switching to output a first alternating current (AC) voltage; a piezoelectric transformer configured to receive the first AC voltage through a first piezoelectric element, and to output a second AC voltage corresponding to mechanical vibration of a second piezoelectric element caused by mechanical vibration of the first piezoelectric element; and a resonator configured to receive the second AC voltage to wirelessly transmit power.

Abstract: There is provided a wireless charging device including: a case part including at least two case portions which are configured to be overlapped with each other; and a power supply part including power supply units disposed in the case portions, respectively, wherein when the case portions are overlapped with each other, power supply electrodes of the power supply units are disposed to be overlapped with each other in the same direction, so as to charge at least one target object.

Abstract: A wireless power transmitter includes a standard resonator including a standard inductor and a standard capacitor connected to the standard inductor in parallel, one or more dedicated variable inductors connected to the standard resonator in series and having inductance varied in response to a control voltage respectively applied to the dedicated variable inductors, one or more dedicated resonance capacitors connected to the dedicated variable inductors in parallel, respectively, and a controlling unit outputting the control voltage.

Abstract: A wireless power transmitter includes a wireless power controller configured to receive an alternating current (AC) voltage, to convert the AC voltage into a direct current (DC) voltage, and to generate an induced current from the DC voltage according to a switching control for a transformer; and a resonator configured to be resonated by the induced current to wirelessly output charging power.

Abstract: A wireless power transmitter includes a common bridge circuit configured to apply a first alternating current (AC) voltage to a terminal of each of a first resonator and a second resonator of the resonators, a first sub-bridge circuit configured to apply a second alternating current (AC) voltage to another terminal of the first resonator while the first alternating current (AC) voltage is being applied to the terminal of the first resonator, and a second sub-bridge circuit configured to apply a third alternating current (AC) voltage to another terminal of the second resonator while the first alternating current (AC) voltage is being applied to the terminal of the first resonator.

Abstract: A wireless power receiver according to an exemplary embodiment in the present disclosure may include a coil receiving power transmitted wirelessly in an inductive-coupling scheme; an electrode receiving power transmitted wirelessly in a capacitive-coupling scheme; and a rectifying unit connected to the coil and the electrode and rectifying input power to output supply power.

Abstract: A charging apparatus maintains a balance in power between battery cells by respectively charging the battery cells with power, and rapidly charges the battery cells with power. The charging apparatus supplying unit wirelessly supplying power, and the battery apparatus includes a plurality of charging units corresponding to a plurality of battery cells in a one-to-one scheme. Each of the plurality of charging units respectively includes a charging unit charging a corresponding battery cell with power wirelessly received from the power supplying unit.

Abstract: A non-contact type power charging apparatus and a non-contact type battery apparatus may transmit power to each of a plurality of battery cells in a capacitive coupling scheme. The non-contact type power charging apparatus may include a power transmitting apparatus transmitting power in a capacitive coupling scheme, and a power receiving apparatus receiving the power transmitted from the power transmitting apparatus to charge each of a plurality of battery cells with the power. The non-contact type battery apparatus may include a plurality of power receiving electrodes each receiving power transmitted in a capacitive coupling scheme, and a plurality of battery cells each charged with the power transmitted to the plurality of power receiving electrodes.