Abstract: Disclosed is a leakage current cancellation device. The device includes a leakage detection resistor connected between a first node connected to a vehicle body ground of a vehicle and a second node connected to a second ground of an external power source. The devices further includes a voltage follower connected in parallel with the leakage detection resistor between the first and second nodes. The voltage follower cancels a potential difference between the first and second nodes.

Abstract: An apparatus for controlling a converter of an eco-friendly vehicle includes: a high-voltage battery; a low-voltage conversion converter configured to convert power supplied from the high-voltage battery into a low voltage to provide power to at least one of an auxiliary battery of the vehicle and an electric load thereof; a renewable energy generator configured to generate power using renewable energy including solar light; a renewable energy conversion converter configured to convert the power supplied from the renewable energy generator to provide power to the at least one of the auxiliary battery and the electric load; and a controller configured to control an output voltage value of the low-voltage conversion converter and an output current of the renewable energy conversion converter.

Abstract: A system of increasing a temperature of a battery for a vehicle includes: an on-board charger having a capacitor and a bidirectional direct current (DC) converter having first input/output terminals connected to the capacitor and second input/output terminals connected to a battery and configured to perform a bidirectional power transfer between the first input/output terminals and the second input/output terminals; and a controller to drive, when temperature rising of the battery is required, the bidirectional DC converter such that a direction of a power transfer alternates and supply an alternating current (AC) current having a predetermined frequency to the battery.

Abstract: An engine start system of a hybrid vehicle includes a converter circuit unit converting voltage and outputting the converted voltage and a switch having a first terminal connected to an output terminal of the converter circuit unit and a second terminal selectively forming an electrical connection with the first terminal. A diode has an anode connected to the second terminal and a cathode connected to the first terminal. A battery is connected to the second terminal. A low-voltage starter connected to the battery and provides rotary power to start an engine in a stopped state by converting battery power into rotational energy. A controller opens the switch and supplies driving power to the low-voltage starter when the engine is started.

Abstract: A system for improving resolution of a voltage command of a low voltage DC-DC converter is provided. The system includes a voltage command signal generator that generates a first voltage command signal having a magnitude of a first specific range for a first voltage command of the low voltage DC-DC converter and a scale part that varies the first voltage command signal generated by the voltage command signal generator based on a preset scale ratio. An offset part sets a minimum value of a variable range of the first voltage command signal of the low voltage DC-DC converter. A resolution increasing part reduces the variable range of the first voltage command signal of the low voltage DC-DC converter by adding an output of the scale part and an output of the offset part.

Abstract: A reception pad for a wireless power transfer (WPT) system includes: a plate-shaped ferrite; an insulating layer disposed on one side of the ferrite; a first coil layer disposed on the insulating layer; an interlayer insulating layer disposed on the first coil layer; and a second coil layer disposed on the interlayer insulating layer. The insulating layer at least partially surrounds the first coil layer and the second coil layer, the first coil layer and the second coil layer at least partially overlap each other and are arranged in a rectangular ring form on the one side of the ferrite, and a ratio of a width which is larger between a first width of the first coil layer and a second width of the second coil layer to a first length of the ferrite in a width direction corresponding to the first width or the second width is 0.14 to 0.15.

Abstract: A system for improving resolution of a voltage command of a low voltage DC-DC converter is provided. The system includes a voltage command signal generator that generates a first voltage command signal having a magnitude of a first specific range for a first voltage command of the low voltage DC-DC converter and a scale part that varies the first voltage command signal generated by the voltage command signal generator based on a preset scale ratio. An offset part sets a minimum value of a variable range of the first voltage command signal of the low voltage DC-DC converter. A resolution increasing part reduces the variable range of the first voltage command signal of the low voltage DC-DC converter by adding an output of the scale part and an output of the offset part.

Abstract: A system for controlling charging power of an eco-friendly vehicle is provided. The system includes a battery, a power supply unit supplying AC power, and an inverter having a plurality of legs including a plurality of power conversion devices. The legs are supplied with power by being connected with the power supply unit and both ends of each of the legs being connected with the battery. One or more switches are disposed between one or more of the legs and the power supply unit. A controller changes a power transmission path from the power supply unit by determining the phase of power that is supplied from the power supply unit and by operating the switch based on the phase of the supplied power.

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 charging apparatus may include a power factor correction converter including a switching element, to correct a power factor of AC power provided by external charging equipment through ON/OFF control of the switching element, to convert the corrected power factor into DC power, and to output the DC power; a DC link capacitor connected to both ends of the PFC converter to form a DC voltage; a DC-DC converter converting a magnitude of the DC voltage formed by the DC link capacitor into a magnitude of a voltage required by an energy storage device to be charged; and a duty controller configured to determine a duty of the switching element in the PFC converter based on a magnitude of a common-mode component of an AC voltage of the AC power provided by the external charging equipment and the magnitude of the DC voltage formed by the DC link capacitor.

Abstract: Disclosed is a charging apparatus capable of reducing a low-frequency leakage current, the charging apparatus including a duty controller that determines the duty of a switching element in a power factor correction converter on the basis of the level of a common-mode component of an AC voltage of AC power provided from an external charging facility, the level of the DC voltage formed by a DC link capacitor, and a leakage current flowing from the connection node of input-terminal Y-capacitors and the connection node of output-terminal Y-capacitors to the ground.

Abstract: An apparatus for controlling a low-voltage DC-to-DC converter of a vehicle for converting high-voltage power into low-voltage power may include a signal selector for selecting and outputting one of a charging-oriented voltage command for charging the battery or a preset burst mode voltage command for operation of the low-voltage DC-to-DC converter in a burst mode in which the battery cannot be charged, a battery charge/discharge current limiter for generating a voltage command compensation value for limiting charge current of the battery when the signal selector outputs the charging-oriented voltage command and limiting discharge current of the battery when the signal selector outputs the burst mode voltage command, and a controller for controlling an output voltage of the low-voltage DC-to-DC converter to follow a compensated voltage command generated by applying the voltage command compensation value to the voltage command output by the signal selector.

Abstract: A charging apparatus capable of reducing low-frequency leakage current includes: a power factor correction converter including a switch, wherein the power factor correction converter converts an AC power inputted by an on/off control of the switch into a DC power by correcting a power factor of the AC power; a DC-DC converter changing a magnitude of voltage outputted from the power factor correction converter into a magnitude of voltage required by an energy storage device to be charged; a first duty controller determining a first duty value of the switch for outputting a voltage having a predetermined magnitude through the power factor correction converter based on a magnitude of a differential mode component of the AC power; and a second duty controller determining a second duty value of the switch for removing a common-mode component of the AC power based on the common-mode component.

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: A voltage drop compensation control system and method of a power supply device are provided. The voltage drop compensation control system of the power supply device, for compensating for a voltage drop generated in an electric connection line between a direct current (DC)-DC converter and a battery includes a controller that generates a compensation voltage command that is obtained by compensating for an output voltage command of the DC-DC converter by applying a first control value for compensating for the voltage drop to the output voltage command. The controller also determines the first control value, based on an error between the compensation voltage command or an output voltage detection value of the DC-DC converter and a voltage of the battery.

Abstract: A charging apparatus capable of reducing low-frequency leakage current includes: a power factor correction converter including a switch, wherein the power factor correction converter converts an AC power inputted by an on/off control of the switch into a DC power by correcting a power factor of the AC power; a DC-DC converter changing a magnitude of voltage outputted from the power factor correction converter into a magnitude of voltage required by an energy storage device to be charged; a first duty controller determining a first duty value of the switch for outputting a voltage having a predetermined magnitude through the power factor correction converter based on a magnitude of a differential mode component of the AC power; and a second duty controller determining a second duty value of the switch for removing a common-mode component of the AC power based on the common-mode component.

Abstract: A charging device according to an exemplary embodiment of the present invention may include: a battery adapted and configured to store a DC voltage, first and second motors adapted and configured to operate as a motor or a generator, first and second inverters adapted and configured to operate the first and second motors, a voltage transformer adapted and configured to boost the DC voltage of the battery to supply it to the first and second inverters and boosts the DC voltage of the inverter to supply it to the battery, and a charging controller adapted and configured to operate the first and second inverters as a booster or operate the voltage transformer as a buck booster according to a voltage that is input through a neutral point of the first and second motors and the voltage of the battery.

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: An apparatus for controlling a converter of an eco-friendly vehicle includes: a high-voltage battery; a low-voltage conversion converter configured to convert power supplied from the high-voltage battery into a low voltage to provide power to at least one of an auxiliary battery of the vehicle and an electric load thereof; a renewable energy generator configured to generate power using renewable energy including solar light; a renewable energy conversion converter configured to convert the power supplied from the renewable energy generator to provide power to the at least one of the auxiliary battery and the electric load; and a controller configured to control an output voltage value of the low-voltage conversion converter and an output current of the renewable energy conversion converter.

Abstract: Disclosed is a leakage current cancellation device. The device includes a leakage detection resistor connected between a first node connected to a vehicle body ground of a vehicle and a second node connected to a second ground of an external power source. The devices further includes a voltage follower connected in parallel with the leakage detection resistor between the first and second nodes. The voltage follower cancels a potential difference between the first and second nodes.