Abstract: The present disclosure relates to techniques for diagnosing a relay in a vehicle on-board charger (OBC), and an apparatus for diagnosing a relay in a vehicle OBC according to an exemplary embodiment may include first to third voltage sensors configured to measure phase-specific voltages for AC inputs to the relay circuit unit, fourth and fifth voltage sensors configured to measure line voltages for AC outputs from the relay circuit unit, and a diagnosis module configured to diagnose the relay circuit unit, based on the phase-specific voltages measured by the first to third voltage sensors and based on the line voltages measured by the fourth and fifth voltage sensors.

Abstract: In an embodiment, a battery charging apparatus includes a charging and discharging port, a power factor correction circuit having first to third inductors, a first relay, an interleave relay, and a controller configured to control a connected or disconnected state of the first relay, and a connected or disconnected state of the interleave relay, such that the battery charging apparatus is configured to transfer an external electric power to a battery through the charging and discharging port, or to transfer a battery electric power of the battery to an external source through the charging and discharging port.

Abstract: A battery charging device includes: a bidirectional charger having a charge and discharge port and a discharge port and connected to a battery, wherein the bidirectional charger includes a power factor correction circuit having first, second, and third legs; and a controller. The controller is configured to switch the first and third legs so that the bidirectional charger outputs a power of the battery to the charge and discharge port when a first battery discharge mode is performed, and to switch the second and third legs so that the bidirectional charger outputs the power of the battery to the discharge port when a second battery discharge mode is performed.

Abstract: A vehicle battery charging system includes a main battery, an auxiliary battery, an integrated converter that includes a high voltage charging device that supplies power to the main battery and a low voltage charging device that supplies power to the auxiliary battery, a solar cell that converts sunlight into electrical energy, a solar cell converter that converts an output of the solar cell into a voltage corresponding to a voltage of the auxiliary battery and outputs the converted voltage to the auxiliary battery, and a switching device that switches between the integrated converter and external power and the integrated converter and the solar cell, wherein the switching device connects the integrated converter and the solar cell in a solar cell only charging mode in which the auxiliary battery is charged by the solar cell.

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 managing a battery of a vehicle includes a first controller configured to control a power-on (IG ON) state and a power-off (IG OFF) state of a plurality of controllers in the vehicle and to be periodically woken up in the power-off (IG OFF) state to wake up at least some of the plurality of controllers, and a second controller configured to turn off a main relay connecting a first battery in the vehicle and a vehicle system when the power-off (IG OFF) state begins, to monitor a state of the first battery storing energy for generating power of the vehicle by maintaining power during a preset first reference time, to be woken up at a wake-up period of the first controller when the first reference time elapses, and to monitor the state of the first battery.

Abstract: A vehicle charger includes a power factor correction converter configured to correct the power factor of alternating current (AC) power is integrated with an input terminal of a DC-DC converter configured to generate a direct-current (DC) voltage having a magnitude required for an energy storage device in the vehicle, thereby reducing the size of the vehicle charger, reducing the number of required elements, and allowing the vehicle charger to have high efficiency; and a method for controlling the same.

Abstract: A vehicle battery charging system includes a main battery, an auxiliary battery, an integrated converter that includes a high voltage charging device that supplies power to the main battery and a low voltage charging device that supplies power to the auxiliary battery, a solar cell that converts sunlight into electrical energy, a solar cell converter that converts an output of the solar cell into a voltage corresponding to a voltage of the auxiliary battery and outputs the converted voltage to the auxiliary battery, and a switching device that switches between the integrated converter and external power and the integrated converter and the solar cell, wherein the switching device connects the integrated converter and the solar cell in a solar cell only charging mode in which the auxiliary battery is charged by the solar cell.

Abstract: A method for controlling charge or discharge of a battery in a battery system including a DC converter down-converting an input voltage thereof and outputting an output, a battery connected to an output terminal of the DC converter, and an electric load connected to the output terminal of the DC converter and supplied with electric power from at least one of the DC converter and the battery, may include measuring a temperature of the battery, first controlling, by a controller, an output of the DC converter so that a charging current supplied to the battery from the DC converter becomes a preset maximum value, when the temperature of the battery is lower than a first predetermined temperature, and second controlling, by the controller, the output of the DC converter such that a current of the battery is substantially equal to zero, when the temperature of the battery is higher than a second predetermined temperature which is higher than the first predetermined temperature.

Abstract: A system for controlling a low voltage DC-DC converter for a vehicle is provided. The system includes a low voltage DC-DC converter that converts a voltage of a main battery into a low voltage and outputs the same. An electric device is connected to an output terminal of the low voltage DC-DC converter and a first relay is connected to the output terminal of the low voltage DC-DC converter at a first terminal thereof. An auxiliary battery is connected to a second terminal of the first relay and a controller turns off the first relay and operates the low voltage DC-DC converter to output a minimum voltage capable of operating the electric device when the auxiliary battery is charged to a preset reference value or more while the main battery is being charged.

Abstract: A method of operating an on-board charger for charging a high voltage battery of an electrically-charged vehicle includes supplying a DC voltage obtained by converting an AC voltage to the high voltage battery to perform a charging operation, measuring an internal voltage of a DC EMI filter for removing noise of the DC voltage, generating a leakage current estimate based on the internal voltage, and controlling the charging operation in accordance with the leakage current estimate.

Abstract: A system for managing a battery of a vehicle includes a first controller configured to control a power-on (IG ON) state and a power-off (IG OFF) state of a plurality of controllers in the vehicle and to be periodically woken up in the power-off (IG OFF) state to wake up at least some of the plurality of controllers, and a second controller configured to turn off a main relay connecting a first battery in the vehicle and a vehicle system when the power-off (IG OFF) state begins, to monitor a state of the first battery storing energy for generating power of the vehicle by maintaining power during a preset first reference time, to be woken up at a wake-up period of the first controller when the first reference time elapses, and to monitor the state of the first battery.

Abstract: A four wheel drive vehicle includes: main driving wheels and auxiliary driving wheels; a first driving motor that provides power to the main driving wheels; a second driving motor that provides power to the auxiliary driving wheels; a battery that stores electrical energy; an inverter that converts and provides the electrical energy stored in the battery to the first driving motor; and a bidirectional power converter that generates charging electric power for charging the battery by converting power supplied from the outside of the vehicle and converts and provides the electrical energy stored in the battery to the second driving motor.

Abstract: A fault diagnosis system of a power converter for an electric vehicle includes a power supply supplied with power and converting the supplied power to provide the power to a motor, a battery, and an electronic device of a vehicle, a power supply supplied with power and converting the supplied power to provide the power to a motor, a battery, and an electronic device of a vehicle, a controller connected to the power supply by a connector and controlling charging and discharging of the battery, and operations of the motor and the electronic device of the vehicle by using the power provided from the power supply, and a fault diagnosis circuit connected between the power supply and the controller and diagnosing whether the connector which connects the power supply with the controller malfunctions.

Abstract: A vehicle charger includes a power factor correction converter configured to correct the power factor of alternating current (AC) power is integrated with an input terminal of a DC-DC converter configured to generate a direct-current (DC) voltage having a magnitude required for an energy storage device in the vehicle, thereby reducing the size of the vehicle charger, reducing the number of required elements, and allowing the vehicle charger to have high efficiency; and a method for controlling the same.

Abstract: A four wheel drive vehicle includes: main driving wheels and auxiliary driving wheels; a first driving motor that provides power to the main driving wheels; a second driving motor that provides power to the auxiliary driving wheels; a battery that stores electrical energy; an inverter that converts and provides the electrical energy stored in the battery to the first driving motor; and a bidirectional power converter that generates charging electric power for charging the battery by converting power supplied from the outside of the vehicle and converts and provides the electrical energy stored in the battery to the second driving motor.

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 controlling a low voltage DC-DC converter for a vehicle is provided. The system includes a low voltage DC-DC converter that converts a voltage of a main battery into a low voltage and outputs the same. An electric device is connected to an output terminal of the low voltage DC-DC converter and a first relay is connected to the output terminal of the low voltage DC-DC converter at a first terminal thereof. An auxiliary battery is connected to a second terminal of the first relay and a controller turns off the first relay and operates the low voltage DC-DC converter to output a minimum voltage capable of operating the electric device when the auxiliary battery is charged to a preset reference value or more while the main battery is being charged.

Abstract: A method for controlling charge or discharge of a battery in a battery system including a DC converter down-converting an input voltage thereof and outputting an output, a battery connected to an output terminal of the DC converter, and an electric load connected to the output terminal of the DC converter and supplied with electric power from at least one of the DC converter and the battery, may include measuring a temperature of the battery, first controlling, by a controller, an output of the DC converter so that a charging current supplied to the battery from the DC converter becomes a preset maximum value, when the temperature of the battery is lower than a first predetermined temperature, and second controlling, by the controller, the output of the DC converter such that a current of the battery is substantially equal to zero, when the temperature of the battery is higher than a second predetermined temperature which is higher than the first predetermined temperature.

Abstract: A charging system with a sensor diagnosis function is provided. The system includes an AC input voltage sensor that detects a voltage of an input end with an AC power applied thereto and a resistor that is connected to the input end. A power factor correction circuit unit adjusts and outputs a power factor of AC power applied through the resistor. An output voltage of the power factor correction circuit unit is applied to a capacity of the system. A controller then diagnoses the AC input voltage sensor based on a value of current passing through the resistor, a value of a voltage of the capacitor, and a resistance value of the resistor.