Abstract: A method of adjusting an output voltage sensing error of a low voltage DC-DC converter to adjust a difference between a value obtained by sensing an output voltage of a low voltage DC-DC converter and a reference value controlling the low voltage DC-DC converter, thereby improving control accuracy is provided. The method of correcting an output voltage sensing error of a low voltage DC-DC converter includes applying a test voltage to an output of the LDC by voltage application equipment, sensing a voltage of the output of the LDC by a voltage sensing circuit and adjusting by a controller a voltage reference map included in an LDC controller that outputs a voltage reference value of the LDC, based on an error between the test voltage and a voltage sensing value sensed by the voltage sensing circuit.

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: A system and a method for controlling a low voltage DC/DC converter (LDC) of a hybrid vehicle is provided in which a fuel efficiency mode for artificially turning off pulse width modulation (PWM) control of the LDC is added, thereby improving fuel efficiency. Accordingly, the fuel efficiency mode for artificially turning off the PWM control of the LDC is added, so that when the fuel efficiency mode is performed, power of an auxiliary battery is temporarily supplied to an electric field load, thereby reducing power consumption of a main battery and improving fuel efficiency. Further, when the auxiliary battery is separated, power of the main battery is temporarily supplied to the electric field load by performing the PWM control of the LDC, to prevent a phenomenon that power is not supplied to the electric field load when the auxiliary battery is separated.

Abstract: A method and system of controlling a converter is provided. The method includes sensing, by a controller, an on and off state of a secondary side switch of the converter and deriving, by the controller, a current command of the converter. The current command is then compared with preset current reference values each provided based on the on and off state of the secondary side switch. As the result of the comparison of the current command with the current reference value, the on and off state of the secondary side switch is either changed or maintained.

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 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 low voltage DC-DC converter of an eco-friendly vehicle is provided. The converter includes an output current limit map applier that is configured to output an output current limit value using an output current limit map. A power controller is configured to amplify the output limit value output from the output current limit map applier to a predefined gain. Furthermore, an output limiter is configured to output the output limit value output from the power controller, and filter and output the output limit value after a predefined time lapses.

Abstract: An active rectifier for a wireless power transfer system includes: a first rectifying circuit; a second rectifying circuit; a first switching circuit and a second switching circuit. The first rectifying circuit, the second rectifying circuit, the first switching circuit, and the second switching circuit are arranged in a form of a bridge circuit between a secondary coil of a vehicle and a battery of the vehicle, and the active rectifier controls the first and second switching circuits according to a charging status of the battery or an output status of the wireless power transfer system in order to change or maintain a charging power to the battery.

Abstract: Disclosed are DC-to-DC converter control methods, ground assemblies and wireless power transfer methods using the same. A method for controlling a DC-to-DC converter of a ground assembly used for wireless power transfer, which includes first, second, third, and fourth switches arranged in a form of a bridge circuit between a power source and a primary coil, may comprise detecting a current flowing through the primary coil at a rising edge of an output voltage signal of the DC-to-DC converter; determining whether a strength of the current is at a negative level which falls within a predetermined reference range; and in response to a determination that the current is not at the negative level, changing switching frequencies of the DC-to-DC converter.

Abstract: A wireless charging method performed by a wireless power receiving apparatus for a vehicle includes: producing a resonance between a primary pad located outside of the vehicle and a secondary pad installed in the vehicle based on an initial switching frequency; and tuning a switching frequency of a direct current (DC) to DC (DC-to-DC) converter within a range determined based on the initial switching frequency, according to an output voltage outputted based on a resonance of the secondary pad which is caused by the primary pad.

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 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: Disclosed herein is a wireless charging device including a heat radiation panel having a radiation plate and a radiation fin protruding from an upper surface of the radiation plate; a core section arranged in a region other than the protruding radiation fin, the core section being made of a material having high permeability; and a coil section arranged on the core section so as to come into contact with the protruding radiation fin.

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: 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 system and a method for controlling a low voltage DC/DC converter (LDC) of a hybrid vehicle is provided in which a fuel efficiency mode for artificially turning off pulse width modulation (PWM) control of the LDC is added, thereby improving fuel efficiency. Accordingly, the fuel efficiency mode for artificially turning off the PWM control of the LDC is added, so that when the fuel efficiency mode is performed, power of an auxiliary battery is temporarily supplied to an electric field load, thereby reducing power consumption of a main battery and improving fuel efficiency. Further, when the auxiliary battery is separated, power of the main battery is temporarily supplied to the electric field load by performing the PWM control of the LDC, to prevent a phenomenon that power is not supplied to the electric field load when the auxiliary battery is separated.

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 voltage sensing circuit of a converter senses input and output voltages of a converter with only one sensing circuit. The voltage sensing circuit is capable of reducing the number of the components for a controller and the volume thereof to save cost, and detecting whether the discontinuous mode (DCM) is entered or not, thereby to apply a separate control algorithm thereto when the DCM is entered.