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 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 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: There are provided an information transmitter and an apparatus including the same. The information transmitter includes a signal generator configured to output an information signal including pulses changed from a first state to a second state or a third state and subsequently changed from the second state or the third state to the first state. A time period in which some of the pulses are changed from the first state to the second state or the third state may be shorter than a time period in which some of the pulses are changed from the second state or the third state to the first state. The information transmitter also includes a transmitting coil configured to receive the information signal and generate a magnetic field based on the information signal.

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.

Abstract: A non-contact type power charging apparatus may include a plurality of power transmitting coils transmitting power in a non-contact scheme, a plurality of switching units connected to the power transmitting coils, respectively, to switch the power transmitted through corresponding power transmitting coils, and a switching controlling unit controlling power switching of the switching units depending on coupling coefficients between each of the power transmitting coils and at least one power receiving coil of a plurality of battery apparatuses. The battery apparatuses may have at least one power receiving coil receiving the power from the power transmitting coils to charge the power in at least one battery cell.

Abstract: A power supplying apparatus includes a first piezoelectric transformer operated at a first operating frequency, a second piezoelectric transformer operated alternately with the first piezoelectric transformer and operated at a second operating frequency, wherein the second operating frequency is a multiple of the first operating frequency.

Abstract: A wireless signal transmitting apparatus, includes: a piezoelectric harvester configured to generate electrical energy responsive to user switch manipulation; and, a wireless communication circuit configured to generate wireless signals from the electrical energy and wirelessly transmit the wireless signals to an external wireless power receiving device.

Abstract: A wireless power receiver included in a device, the wireless power receiver including a core part fixed to be adjacent to a surface of an internal part; a receiving coil wound around the core part; and a power circuit configured to provide power received from the receiving coil to the wearable device.

Abstract: A wireless switch includes: an adjusting member configured to rotate; a rotary plate comprising a first extending bar extending from a surface of the rotary plate in a radial direction and configured to be rotated together with the adjusting member; a first deformation member configured to be deformed by the first extending bar when the rotary plate rotates to cause the first extending bar to contact the first deformation member; a first piezoelectric element disposed on the first deformation member and configured to generate electricity when the first deformation member is deformed; and a radio frequency (RF) communications module unit configured to transmit a signal according to the electricity generated by the first piezoelectric element.

Abstract: A multilayer electronic component includes a ceramic body having stacked dielectric layers to form a first capacitor part and a second capacitor part, wherein the first capacitor has a constant capacitance, and the second capacitor part has a variable capacitance; a voltage control terminal formed on a lateral surface of the ceramic body; an input terminal disposed on another lateral surface of the ceramic body corresponding to the first capacitor part; and an output terminal disposed on the other lateral surface of the ceramic body corresponding to the second capacitor part separate from the input terminal.

Abstract: A wireless signal transmitting apparatus, includes: a piezoelectric harvester configured to generate electrical energy responsive to user switch manipulation; and, a wireless communication circuit configured to generate wireless signals from the electrical energy and wirelessly transmit the wireless signals to an external wireless power receiving device.

Abstract: A direct current (DC)-alternating current (AC) power convertor is disclosed. The DC-AC power converting circuit may include an inverter configured to convert the DC power into first output power, a piezoelectric transforming unit including piezoelectric transformers connected in parallel to an output terminal of the inverter, and each piezoelectric transformer of the piezoelectric transformers configured to transform the first output power to second output power, and an output configured to add the second output power output from the each of the piezoelectric transformer and to output AC power, wherein each piezoelectric transformer has a resonance frequency.

Abstract: A power supply apparatus includes: converters configured to switch an input power to convert the input power into a total direct current (DC) power; and a controller configured to control DC power-to-total DC power ratios of the converters based on at least one of whether or not the converters are operated or operation temperatures of the converters.