Abstract: A method of estimating a root mean square (RMS) of an alternating current (AC) voltage is provided. The system includes a rectifier configured to rectify the AC voltage and a controller configured to derive a delayed AC voltage by delaying the rectified AC voltage by a preset delay time. The controller is configured to estimate a root mean square (RMS) of the AC voltage based on the rectified AC voltage and the delayed AC voltage.

Abstract: A motor cooling structure is provided. The structure includes a motor housing that has an inner wall, an outer wall, and a plurality of cooling fins which are disposed on the inner wall. An inlet boss is obliquely connected to the motor housing and an outlet boss is obliquely connected to the motor housing. The outlet boss is spaced apart from the inlet boss. Additionally, a first cooling channel and a second cooling channel are disposed between the inner wall and the outer wall, and are connected in parallel to the inlet boss and the outlet boss.

Abstract: An electronic device is provided. The electronic device includes a memory configured to store at least one instruction associated with a universal serial bus (USB) communication function or a wireless communication function operation, and at least one processor connected to the memory and configured to execute the at least one instruction stored in the memory. When a request for execution of the wireless communication function is received during execution of the USB communication function, the at least one instruction executed by the processor is configured to deactivate the execution of USB communication function in corresponding to a type of the USB communication function.

Abstract: Disclosed is a charging apparatus mounted in a vehicle. The charging apparatus includes at least two power modules parallel to each other to convert input power applied from an outside into a charging power for charging a high-voltage battery, at least two slave controllers that outputs information about whether each of the power modules enters a constant-voltage charging mode, based on the charging power output from the power modules, and a master controller that determines whether the at least two power modules enter the constant-voltage charging mode by utilizing the information, which is received from the slave controllers, about whether each of the power modules enters the constant-voltage charging mode, wherein the master controller controls such that one of the power modules is operated when the power modules enter the constant-voltage charging mode.

Abstract: A wound rotor motor is provided, in which a rotary shaft is arranged in the vertical direction, to immerse lower coil portions of a stator and a rotor in cooling oil, thereby improving the cooling effect beyond that of a conventional configuration, in which lower coil portions are partially immersed, and consequently decreasing the capacity of an oil pump. A wound rotor motor is provided, in which a rotary shaft is arranged in the vertical direction and has therein a flow passage, through which cooling oil moves up from the region below the rotor and is sprayed to the region above the rotor by centrifugal force generated by rotation of the rotor, thereby enhancing the motor-cooling effect, decreasing the frictional loss of the rotor due to the cooling oil, and consequently improving the operational efficiency of the motor.

Abstract: Disclosed is an on-board charging system in which, when a plurality of charging circuits is connected in parallel between input and output terminals, operation timings of switching circuits in the respective charging circuits are interlocked to minimize ripples of an input alternating current. The on-board charging system includes: a plurality of charging circuits configured to each have a power factor correction circuit portion for correcting a power factor of alternating current input power by pulse width modulation control of a switching element and to be connected in parallel with each other between an input terminal of the AC input power and an output terminal connected to an object to be charged; and a controller configured to interlock the switching elements to generate a PWM control signal for performing PWM control.

Abstract: A low-noise amplifier in a receiver supporting a beam forming function may selectively change a phase shift for beam steering. The low-noise amplifier may include first and second transistors and a variable capacitance circuit connected to a gate of the second transistor. The variable capacitance circuit may selectively change capacitance thereof based on a capacitance control signal applied thereto according to beam-forming information, where the changed capacitance correspondingly causes a phase change in an output signal of the low-noise amplifier. A similar scheme may be employed for amplifiers in transmit signal paths to steer a transmit beam.

Abstract: A wireless communication device includes an amplifier block amplifying a radio frequency (RF) input signal. The amplifier block includes: a first amplification unit and a second amplification unit. The first amplification unit amplifies the RF input signal to generate a first RF amplified signal including a first non-linearity factor and a second RF amplified signal including a second non-linearity factor, and combines the first and second RF signals to generate a third RF amplified signal. The second amplification unit receives and amplifies the third RF amplified signal to output an RF output signal corresponding to the at least one carrier.

Abstract: An apparatus for controlling a low voltage direct current (DC)-DC converter (LDC) for an eco-friendly vehicle includes a reference current receiver for receiving a reference current, a ramp signal generator for generating a ramp signal by overlapping an input current of the LDC, and a DC offset and a sawtooth wave for adjusting a gradient of the ramp signal, and a comparator for generating a pulse width modulation (PWM) signal using the reference current received by the reference current receiver and the ramp signal generated by the ramp signal generator.

Abstract: A current stabilization method performed by a vehicle charging apparatus, which includes a power factor corrector for correcting a power factor of an alternating current (AC) power source, vehicle charging apparatus converting an AC voltage of the AC power source into a direct current (DC) voltage to charge a vehicle battery, may include downwardly-adjusting a current control bandwidth of the power factor corrector when the adjusting of the current control bandwidth of the power factor corrector is requested.

Abstract: A DC-DC converter may include an inductor having one end connected to an input terminal and the other end connected to an output terminal; a switching circuit configured to determine whether or not power is to be applied from the input terminal to the inductor; a snubber circuit configured to be connected to both ends of the inductor and to the output terminal; an output current controller configured to derive an inductor current command value, which is the magnitude of a current flowing through the inductor, to allow an output current detection value obtained by detecting a current supplied to the output terminal to follow a predetermined output current command value; and an inductor current controller configured to determine the switching duty of the switching circuit to allow an inductor current detection value, obtained by detecting the current flowing through the inductor, to follow the inductor current command value.

Abstract: A semiconductor light emitting device includes a light emitting structure including a first conductivity-type semiconductor layer, an active layer, and a second conductivity-type semiconductor layer, sequentially stacked on a substrate along a first direction, and including an exposed region exposing the first conductivity-type semiconductor layer. A first contact electrode is in the exposed region, a second contact electrode is on the second conductivity-type semiconductor layer, and an insulating layer covers the light emitting structure. Separate electrode pads penetrate the insulating layer to be electrically connected to the first contact electrode and the second contact electrode. A side surface of at least one of the first and second electrode pads may extend to be coplanar with a side surface of the substrate along the first direction.

Abstract: A method and system of operating an on-board charger (OBC) for an eco-friendly vehicle are provided to improve durability and extend a lifespan of the OBC during the charging of a vehicle battery using a commercial power source. The system improves durability and extends a lifespan of the OBC including a power factor correction (PFC) part by alternately operating a first boost converter and a second boost converter of the PFC part during the charging of a battery by using a commercial power supplier (an in-cable control box (ICCB)).

Abstract: A control system and a method for an on-board battery charger (OBC) of a vehicle generate a DC link voltage instruction through a proportional integral control that regards, as an instruction, a resonance switching frequency determined by a resonance capacitance and a resonance inductance of the LLC converter and allow the switching frequency of an LLC converter to operate at the resonance frequency, thus enhancing efficiency of the OBC.

Abstract: A control system and a method for an on-board battery charger (OBC) of a vehicle generate a DC link voltage instruction through a proportional integral control that regards, as an instruction, a resonance switching frequency determined by a resonance capacitance and a resonance inductance of the LLC converter and allow the switching frequency of an LLC converter to operate at the resonance frequency, thus enhancing efficiency of the OBC.

Abstract: A power conversion apparatus, a method for controlling the same and a vehicle including the same is provided. The power conversion apparatus includes a first power conversion portion having a first end connected to a first battery and a second end selectively connected to at least one of a power-supply portion and a second battery, a second power conversion portion having a first end connected to the first battery and a second end connected to the second battery. The second power conversion portion is configured to provide power supplied from the first battery to the second battery. A switching portion is configured to connect any one of the power-supply portion and the second battery to the first power conversion portion.

Abstract: A method of controlling an on-board charger (OBC) and an OBC system are capable of improving efficiency of the OBC by controlling a DC link voltage such that a DC-DC LLC converter of an ecofriendly vehicle always operates at a resonance frequency. The method includes: detecting a switching turn-on time of a switching unit and a conduction time of a diode, comparing the switching turn-on time with the conduction time, comparing a point of time when the switching unit is turned on with a point of time when the diode becomes conductive, determining an operating frequency region of the switching unit, and controlling a voltage of an input terminal of the LLC converter such that a switching frequency of the switching unit is in a resonance frequency region of the LLC converter according to the determined operating frequency region.

Abstract: A method for controlling a power factor correction circuit includes: sensing, by a control unit, an input signal; deriving, by the control unit, a delay correction input signal using the input signal and a previous input signal that is sensed before the input signal; and controlling, by the control unit, the power factor correction circuit using the derived delay correction input signal.

Abstract: Disclosed herein is a vehicle battery charging control system, which is capable of increasing efficiency of power delivered to an electric device and a low-voltage battery to improve fuel efficiency, by connecting a low-voltage DC-DC converter (LDC) to an AC power source instead of a high-voltage battery upon charging a low-voltage battery of a vehicle to prevent power delivery efficiency of an on-board battery charger (OBC) from being reduced.

Abstract: A wireless terminal is provided that includes a first receiver that includes a first input unit configured to perform impedance matching on a first reception signal to output a first RF input signal. A first amplification unit is configured to amplify the first RF input signal to output one or more first RF output signals in an inter-band CA mode and an intra-band CA mode. A first output unit is configured to down-convert at least one of the one or more first RF output signals to a baseband. A second receiver includes a second output unit. In the intra-band CA mode, the one or more first RF output signals includes a first RF signal and a second RF signal, and the first amplification unit is further configured to provide the first output unit with the first RF signal and provide the second output unit with the second RF signal.