Abstract: A control device and a control method can improve a voltage utilization ratio of an inverter for a green car, in which an input DC voltage of the inverter is modulated by a maximum amount into an output AC voltage of the inverter by changing the output AC voltage incapable of being linearly output into a voltage capable of being linearly output. The control method includes steps of: generating a two-phase current command having two phases of a first current command and a second current command; generating a two-phase voltage command having two phases of a first voltage command and a second voltage command; generating a three-phase pole voltage command; modulating the three-phase pole voltage command into a linear output voltage capable of being linearly output; and calculating a voltage gain value, using the two-phase voltage command and an input DC voltage of the inverter.

Abstract: A method and apparatus for controlling a current of a multi-phase interleaved converter are provided. The method includes filtering, through a filter, currents flowing into converters of respective phases in a multi-phase interleaved converter having multiple phases, The method further includes receiving values of the filtered currents for respective phases and a duty ratio for any one of the multiple phases generated in response to a current flowing into the phase and adjusting duty ratios for phases other than the phase, based on the received current values for respective phases.

Abstract: A two-phase interleaved converter includes two sub-circuits, a voltage controller, a current controller, a balancing controller and a phase shifter. The voltage controller receives the output voltage of the two sub-circuits and outputs a signal in proportion to the level of the output voltage. The current controller receives the output signal of the voltage controller and an inductor current from one of the two sub-circuits and outputs a control signal that controls one of the two sub-circuits which is in charge of one phase. The balancing controller receives values of currents output from the two sub-circuits and calculates a difference between the values of the currents output from the two sub-circuits to control a duty ratio of the control signal applied to one of the two sub-circuits. The phase shifter shifts a phase of the control signal output from the balancing controller.

Abstract: A system and method for controlling an on-board battery charger of an eco-friendly vehicle are provided. In the method, when instantaneous interruption of electric power occurs in an AC input power source, a DC-DC controller adjusts an output current instruction to be limited to the minimum charging power, and a power factor corrector (PFC) controller outputs a voltage instruction to a first capacitor (DC link capacitor) connected to an output terminal of the PFC controller to be updated to zero (0) or an actual value of the DC link capacitor. When the AC input power source is then restored, the PFC controller outputs the voltage instruction to the first capacitor to be increased to the existing voltage instruction with a predetermined slope, to smoothly perform the charging operation of the on-board battery charger without pause.

Abstract: A battery charging system includes a PFC converter which converts an alternating current input voltage which is input from a power supply to a direct current output voltage, a DC-DC converter which changes an output voltage of the PFC converter, a battery which is charged by the DC-DC converter, and a controller which calculates power conversion efficiency based on the input current and the input voltage, a charged voltage of the battery, and a charging current for the battery, and updates the output voltage of the PFC converter according to the power conversion efficiency. A battery charging method includes steps of: calculating power conversion efficiency using the input current and the input voltage from the power supply, and the charging current and the charged voltage of the battery; and updating the output voltage of the PFC converter according to the calculated power conversion efficiency.

Abstract: An emergency operation method of a hybrid vehicle, which includes an engine, a first motor connected to the engine through an engine clutch and transmitting power to a vehicle wheel, and a second motor connected with the engine to directly transmit power, includes charging a DC-link terminal with a first counter electromotive force of the first motor and the second motor generated by driving energy of the vehicle or power from the engine when a main relay is off while the vehicle travels. A voltage of the DC-link terminal is controlled by using a second inverter which is connected between the DC-link terminal and the second motor in a driving state of the engine. Power is supplied by using the DC-link terminal, of which the voltage is controlled, for an emergency operation of the vehicle.

Abstract: A power supply apparatus of an eco-friendly vehicle is provided. The power supply apparatus includes a battery that is configured to supply electric power for driving a vehicle and an inverter that is configured to drive a motor of the vehicle. A power converter is configured to correct a power factor of AC power applied from exterior, or to supply power of the battery to the inverter. A DC converter is configured to convert a power output from the power converter to a charging power for charging the battery. A first relay is configured to turn a power transmission between the battery and the power converter on/off and a second relay is configured to turn the power transmission between the battery and the power converter on/off.

Abstract: An output voltage control method and apparatus are provided. The method includes sensing output voltages of a DC-DC converter and a high-voltage battery and sensing an inductor current flowing through an inductor in a boost circuit at a front end of the DC-DC converter. In addition, the method includes varying a gain of an output voltage controller of the DC-DC converter based on a difference of the sensed inductor current with respect to an inductor current at the center point in a specified region.

Abstract: A charging control method and system for an environmentally friendly vehicle are provided and promote the enhancement of charging efficiency by improving a power control method of a power factor correction (PFC) converter while a battery is being charged through an on board charger (OBC) in vehicle. The method sensing, by a voltage detector, a battery voltage during charging and calculating, by a controller, a target value to maintain an output voltage of the PFC converter. The target value is calculated from the sensed battery voltage and the maximum available duty value of the DC-DC converter. The output voltage of the PFC converter is maintained, based on the calculated target value.

Abstract: An apparatus and a method for charging a battery for a vehicle are provided. The apparatus includes a power factor correction circuit that is configured to distribute charging power output from a charging device, which is connected to a power source, to multiple phases, and to correct a power factor of charging power distributed to the respective phases. In addition, a controller is configured to operate the power factor correction circuit to distribute charging power to some of the multiple phases based on the charging device or the charging power of the charging device.

Abstract: A method and apparatus for controlling a current of a multi-phase interleaved converter are provided. The method includes filtering, through a filter, currents flowing into converters of respective phases in a multi-phase interleaved converter having multiple phases, The method further includes receiving values of the filtered currents for respective phases and a duty ratio for any one of the multiple phases generated in response to a current flowing into the phase and adjusting duty ratios for phases other than the phase, based on the received current values for respective phases.

Abstract: A system and a method for controlling a DC-DC converter include a microcomputer for deriving an input limiting current value by dividing an input limiting power value by an input voltage value. A conversion circuit scales the input limiting current value to a limiting voltage value. A voltage control circuit derives a control voltage value based on an output voltage value and a reference voltage value and defines the limiting voltage value as a control voltage limiting value. A current control circuit generates a pulse width modulation (PWM) control signal based on the control voltage value.

Abstract: A control device and a control method can improve a voltage utilization ratio of an inverter for a green car, in which an input DC voltage of the inverter is modulated by a maximum amount into an output AC voltage of the inverter by changing the output AC voltage incapable of being linearly output into a voltage capable of being linearly output. The control method includes steps of: generating a two-phase current command having two phases of a first current command and a second current command; generating a two-phase voltage command having two phases of a first voltage command and a second voltage command; generating a three-phase pole voltage command; modulating the three-phase pole voltage command into a linear output voltage capable of being linearly output; and calculating a voltage gain value, using the two-phase voltage command and an input DC voltage of the inverter.

Abstract: A battery charging system using a charger and a driving control method of the charger thereof are provided which increase a driving time of the charger when an instantaneous power failure of charger input voltage occurs in the battery charging system. Thus, a sufficient time is secured for obtaining and processing more precise information regarding a driving state of the charger and the capacity of a capacitor is decreased compared to the related art.

Abstract: A multi-phase interleaved converter includes n sub-circuits of phases, a current controller and a balancing controller. The n sub-circuits of phases have inputs connected in parallel and outputs connected in parallel in order to convert a direct current (DC) or alternating current (AC) input voltage of one level into a DC or AC output voltage of another level. The current controller receives a current control command and a phase current value of a particular sub-circuit of a particular phase among the n sub-circuits of the respective phases to output a control signal for controlling the particular sub-circuit of the particular phase. The balancing controller receives phase current values of the n sub-circuits of the respective phases and receives a control signal output from the current controller to adjust the duty ratios of control signals applied to the other sub-circuits.

Abstract: An output voltage control method and apparatus are provided. The method includes sensing output voltages of a DC-DC converter and a high-voltage battery and sensing an inductor current flowing through an inductor in a boost circuit at a front end of the DC-DC converter. In addition, the method includes varying a gain of an output voltage controller of the DC-DC converter based on a difference of the sensed inductor current with respect to an inductor current at the center point in a specified region.

Abstract: An emergency operation method of a hybrid vehicle, which includes an engine, a first motor connected to the engine through an engine clutch and transmitting power to a vehicle wheel, and a second motor connected with the engine to directly transmit power, includes charging a DC-link terminal with a first counter electromotive force of the first motor and the second motor generated by driving energy of the vehicle or power from the engine when a main relay is off while the vehicle travels. A voltage of the DC-link terminal is controlled by using a second inverter which is connected between the DC-link terminal and the second motor in a driving state of the engine. Power is supplied by using the DC-link terminal, of which the voltage is controlled, for an emergency operation of the vehicle.

Abstract: Provided is an inverter control system and method for an eco-friendly vehicle, by which overall improvements can be obtained in terms of switching loss, electromagnetic performance, noise-vibration-harshness (NVH) performance, control stability, and so forth, when compared to a conventional case in which one fixed switching frequency and one fixed sampling frequency are used over the entire operation area. To this end, the inverter control method for an eco-friendly vehicle which generates a pulse width modulation (PWM) signal according to a switching frequency and a sampling frequency and controls ON/OFF driving of a switching element, in which a controller changes and sets the switching frequency according to a current motor speed, changes and sets a sampling frequency according to the switching frequency, and controls on/off driving of a switching element according to the switching frequency corresponding to the motor speed and the sampling frequency.

Abstract: A battery charging system includes a PFC converter which converts an alternating current input voltage which is input from a power supply to a direct current output voltage, a DC-DC converter which changes an output voltage of the PFC converter, a battery which is charged by the DC-DC converter, and a controller which calculates power conversion efficiency based on the input current and the input voltage, a charged voltage of the battery, and a charging current for the battery, and updates the output voltage of the PFC converter according to the power conversion efficiency. A battery charging method includes steps of: calculating power conversion efficiency using the input current and the input voltage from the power supply, and the charging current and the charged voltage of the battery; and updating the output voltage of the PFC converter according to the calculated power conversion efficiency.

Abstract: An apparatus for controlling a motor system of an environment-friendly vehicle includes a tilt angle sensor to measure a driving tilt angle of a vehicle; a hill hold determinator to calculate a real-time driving gradient of the vehicle in order to determine a hill hold situation based on tilt angle information from the tilt angle sensor; and a variable switching determination controller to calculate a command torque for a motor based on the real-time gradient calculated by the hill hold determinator and to determine a variable switching condition of an inverter based on the command torque, a motor speed and previous and current tilt angle information from the tilt angle sensor.