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 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: An apparatus for controlling an LLC converter is provided. The apparatus includes a current controller that determines a first switching frequency control value of a switching element in the LLC converter to cause an output current detection value of the LLC converter to correspond to a predetermined output current command value. Additionally, a feedforward controller determines a second switching frequency control value for operating the switching element by applying a feedforward control value that corresponds to a ripple component included in an input voltage of the LLC converter to the first switching frequency control value.

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 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 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: 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: A charging control method for an electric vehicle is provided. The method uses a vehicle charging device that includes a power factor correction circuit (PFC) and a DC/DC converter. The method includes receiving, by a PFC controller, a control pilot (CP) signal from an external charging device and restricting by the PFC controller an allowable current value derived by analyzing the CP signal to a maximum current value that is to be applied to the PFC. The PFC controller then derives an output current command value of the DC/DC converter by applying an output value of a voltage controller of the PFC to the allowable current value. A DC/DC converter controller then charges a battery using the output current command value of the DC/DC converter.

Abstract: A method and system of controlling a charging device for vehicles are provided. The method includes sensing overcurrent in a power factor correction circuit of the charging device and turning off the power factor correction circuit upon sensing overcurrent. An output voltage of the power factor correction circuit is then increased when the number of generations of sensed overcurrent is equal to or less than a predetermined first reference value and the power factor correction circuit is turned on.

Abstract: An apparatus and a method are provided for controlling a low DC-DC converter (LDC) in an electric vehicle by prioritizing respective controllers, connecting the controllers in series in ascending order according to priority, and determining a command voltage of the LDC on the basis of output voltages of the respective controllers. Accordingly, even when a controller with a highest priority is operating, controllers of lower priority continue operating. Thus, electrical load performance degradation caused by instantaneous overcurrent generated in state transitions is prevented.

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: An apparatus and a method of determining a frequency of an AC power source that more accurately determine the frequency of the AC power source connected to a vehicle are provided. The apparatus includes a rectifier that is connected to the AC power source to rectify an AC voltage input from the AC power source, a first filter connected to an output terminal of the rectifier to filter a rectified voltage output by the rectifier and a second filter connected to the output terminal of the rectifier to filter the rectified voltage output by the rectifier. Further, a frequency determination unit configured to receive the rectified voltages that pass through the first and second filters and determine a voltage frequency of the AC power source from the rectified voltage that pass through the first filter using the rectified voltage that pass through the second filter as a frequency determination level.

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 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.