Abstract: A device and method are provided for a charger for vehicles. In particular, the charger includes, an AC/DC converter configured to convert a commercial alternating current power source to a direct current power source and a DC/DC converter configured to convert the direct current power source applied from the AC/DC converter to a battery charging power source. The direct current power source is supplied to a battery. The DC/DC converter includes a snubber circuit that reduces the magnitude of a ripple current of the charging power source.

Abstract: Provided is a printed circuit board including: an insulating layer; electronic devices embedded in the insulating layer; and an adhesive layer for fixing the electronic devices.

Abstract: A primary coil circuit of a ground assembly for wirelessly transferring power to a secondary coil includes: a primary coil magnetically coupled to the secondary coil and having a first terminal and a second terminal; a second capacitor having a first terminal and a second terminal connected to the first terminal of the primary coil; a first inductor having a first terminal coupled to a first input terminal of a power source and a second terminal coupled to the first terminal of the second capacitor; and a first capacitor having a first terminal coupled commonly to the second terminal of the first inductor and the first terminal of the second capacitor and a second terminal coupled commonly to the second terminal of the primary coil and a second input terminal of the power source.

Abstract: A wireless power transmission pad for transmitting wireless power to a reception pad including a secondary coil includes: a rectangular-shaped primary coil having an X-width defined in an x-direction and a Y-width defined in a y-direction and having a central space; a ferrite coupled to the primary coil; and a housing supporting the primary coil and the ferrite. A first cross-sectional area of a first portion including the X-width of the primary coil is smaller than a second cross-sectional area of a second portion including the Y-width of the primary coil.

Abstract: Disclosed are a hydrogen sensor which includes a P-type silicon nanowire array and a hydrogenation catalyst formed on a surface of the nanowire array, and a method of manufacturing the same.

Abstract: A resonant converter system is provided. The resonant converter system includes a secondary side of a transformer that is disposed within an LLC resonant converter. The secondary side of the transformer is configured with a single coil. Additionally, a rectifier of a secondary side of the LLC resonant converter includes a single diode.

Abstract: An active rectifier for a wireless power transfer system includes: a first rectifying circuit; a second rectifying circuit; a first switching circuit and a second switching circuit. The first rectifying circuit, the second rectifying circuit, the first switching circuit, and the second switching circuit are arranged in a form of a bridge circuit between a secondary coil of a vehicle and a battery of the vehicle, and the active rectifier controls the first and second switching circuits according to a charging status of the battery or an output status of the wireless power transfer system in order to change or maintain a charging power to the battery.

Abstract: Disclosed are DC-to-DC converter control methods, ground assemblies and wireless power transfer methods using the same. A method for controlling a DC-to-DC converter of a ground assembly used for wireless power transfer, which includes first, second, third, and fourth switches arranged in a form of a bridge circuit between a power source and a primary coil, may comprise detecting a current flowing through the primary coil at a rising edge of an output voltage signal of the DC-to-DC converter; determining whether a strength of the current is at a negative level which falls within a predetermined reference range; and in response to a determination that the current is not at the negative level, changing switching frequencies of the DC-to-DC converter.

Abstract: A thermoelectric nanocomposite is provided. The thermoelectric nanocomposite includes: a matrix having n-type semiconductor characteristics and comprising Mg, Si, Al, and Bi components, and a nanoinclusion comprising Bi and Mg components. The thermoelectric nanocomposite has significantly increased thermoelectric energy conversion efficiency by simultaneously having an increased Seebeck coefficient and a decreased thermal conductivity, such that the thermoelectric nanocomposite is usefully used to implement a thermoelectric device having high efficiency.

Abstract: A method for changing a capacitance value of an output capacitor of a power factor corrector (PFC) includes applying AC power to a power conversion circuit. It is sensed whether an instantaneous power failure occurs in the AC power. Output capacitors of the PFC of the power conversion circuit are connected in parallel to each other to increase capacitance values of the output capacitors, when it is sensed that the instantaneous power failure does not occur in the AC power.

Abstract: A wireless charging method performed by a wireless power receiving apparatus for a vehicle includes: producing a resonance between a primary pad located outside of the vehicle and a secondary pad installed in the vehicle based on an initial switching frequency; and tuning a switching frequency of a direct current (DC) to DC (DC-to-DC) converter within a range determined based on the initial switching frequency, according to an output voltage outputted based on a resonance of the secondary pad which is caused by the primary pad.

Abstract: A cooling device for a transformer, capable of reducing heat generation from windings and a core, is provided. The cooling device for the transformer includes a primary winding and a second winding wound around a center part of the core and separated from each other. A heat-dissipating panel for releasing heat generated from the core, the primary winding, and the secondary winding to the exterior using heat conductance is inserted between the primary winding and the secondary winding. In addition, the heat-dissipating panel is configured to release heat using exposed edges of the primary winding and the secondary winding.

Abstract: A semiconductor system includes a first semiconductor device and a second semiconductor device. The first semiconductor device outputs an external command. The second semiconductor device provides a first supply voltage to a bit line sense amplifier. The first supply voltage is generated by using a precharge voltage in response to the external command during a first time period from a point in time when a precharge mode begins. The second semiconductor device also adjusts a voltage level of the first supply voltage during a second time period from a point in time when the first time period terminates to a point in time when an active mode begins.

Abstract: A sensing system includes a sensor including a flexible substrate and a graphene oxide sensing element deposited on the flexible substrate. The graphene oxide sensing element has first and second sides. First and second electrical connectors coupled to the first and second sides of the graphene oxide sensing element, respectively. A power source is coupled to the first and second electrical connectors of the sensor and is adapted to apply a constant voltage to the sensor. The sensing system also includes a measurement element measuring a current in the graphene oxide sensing element due to the constant voltage and a calculation element calculating an electrical resistance of the graphene oxide sensing element based on the electrical current and the constant voltage and calculating a condition at a location of the sensor based on a relationship between the electrical resistance and the condition for the graphene oxide sensing element.

Abstract: A method and system for communicating between devices according to the present invention are provided. The method for communicating between the devices according to the present invention is used for communicating with a first terminal, and is carried out in a device having a capacitive touch screen. The method includes: detecting a change in capacitance for a specific part of the capacitive touch screen, which occurs by means of the first terminal; and acquiring information transferred from the first terminal on the basis of the detected change in capacitance of the capacitive touch screen. The communicating method using such a touch screen may be easily used for various services such as authenticating terminals or transferring files between local terminals.

Abstract: Disclosed herein is a wireless charging device including a heat radiation panel having a radiation plate and a radiation fin protruding from an upper surface of the radiation plate; a core section arranged in a region other than the protruding radiation fin, the core section being made of a material having high permeability; and a coil section arranged on the core section so as to come into contact with the protruding radiation fin.

Abstract: A vehicle charging device is provided and efficiently operates a converter to charge a battery mounted within vehicles. The vehicle charging device includes a power-supply unit that provides a direct current (DC) voltage and a DC/DC converter that converts the DC voltage received from the power-supply unit into a battery charging voltage. The converter also includes an active snubber that is mounted to a secondary coil of a main transformer. The converter is configured to reduce a peak noise generated from the secondary coil using the active snubber and transmit the resultant voltage having the reduced peak noise to an output terminal.

Abstract: A device and method are provided for a charger for vehicles. In particular, the charger includes, an AC/DC converter configured to convert a commercial alternating current power source to a direct current power source and a DC/DC converter configured to convert the direct current power source applied from the AC/DC converter to a battery charging power source. The direct current power source is supplied to a battery. The DC/DC converter includes a snubber circuit that reduces the magnitude of a ripple current of the charging power source.

Abstract: Provided is a DC current breaker having a high-speed breaking function appropriate to a voltage-type converter and a DC current breaking method. In addition, provided is a DC current breaker and a DC current breaking method capable of reducing cost of the breaker and securing economical competiveness by using a relatively simple configuration.

Abstract: A method of the invention includes preparing a mold having a hydrogen detection part pattern, a nanogap pattern and a base to be formed on a hydrogen sensor substrate; preparing a material to which the patterns are transferrable; forming the hydrogen sensor substrate by bringing the mold into contact with the material to thus transfer the patterns to the material and then detaching the mold from the material to which the patterns are transferred, the hydrogen sensor substrate having a base part corresponding to the base, a plurality of hydrogen detection parts erected from the base part and corresponding to the nanogap pattern and a plurality of nanogaps formed between the hydrogen detection parts and corresponding to the hydrogen detection part pattern; and forming, on the hydrogen sensor substrate, a thin film of a transition metal or an alloy thereof to be expanded by hydrogen.