Abstract: An electrified vehicle includes an inverter to convert a DC voltage of an input terminal into an AC voltage based on a PWM control signal to output the AC voltage to an output terminal, an inverter controller to control a duty ratio of the PWM control signal in order to adjust a level of the AC voltage to a level of a target voltage, and a battery controller to determine whether an overcurrent is generated based on a maximum instantaneous current output from the output terminal of the inverter in a battery power output mode and terminate the battery power output mode when the overcurrent is generated, determine whether to re-enter the battery power output mode based on the number of overcurrent generations when the battery power output mode is terminated, and set the level of the target voltage in response to the number of overcurrent generations upon re-entering.

Abstract: An apparatus for controlling a power factor correction circuit of a charger for charging a vehicle batter is configured to correct a power factor of an input AC voltage through switching of a switching element. The apparatus for controlling the power factor correction circuit includes: a phase angle detection unit configured to detect phase angle information of the input AC voltage; and a frequency determination unit configured to synchronize a period in which a preset frequency variation value varies, with a period of the input AC voltage by applying the phase angle information to the frequency variation value, and determine, as a switching frequency of the switching element, a value obtained by applying the synchronized frequency variation value to a preset fundamental frequency value.

Abstract: An embodiment control device includes a voltage controller configured to output an input current command value of a power factor correction (PFC) based on an output voltage and an output voltage command value of the PFC, a current controller configured to control an input current of the PFC by determining a switching duty of the PFC based on the input current command value, and a current command upper limit generator configured to output an input current command upper limit value of the PFC based on an input current limit value and an input current command offset value of the PFC, wherein the input current command upper limit value has an alternating current (AC) component.

Abstract: A method for controlling an LLC resonance converter controls a converter through the steps of detecting parameter values related to operation of the converter, determining a switching duty of the converter on the basis of the detected parameter values, and controlling the converter with the determined switching duty to improve nonlinearity of a gain curve of the converter, thereby reducing output current ripples and achieving low-gain output.

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: An apparatus for controlling a power factor correction circuit of a charger for charging a vehicle batter is configured to correct a power factor of an input AC voltage through switching of a switching element. The apparatus for controlling the power factor correction circuit includes: a phase angle detection unit configured to detect phase angle information of the input AC voltage; and a frequency determination unit configured to synchronize a period in which a preset frequency variation value varies, with a period of the input AC voltage by applying the phase angle information to the frequency variation value, and determine, as a switching frequency of the switching element, a value obtained by applying the synchronized frequency variation value to a preset fundamental frequency value.

Abstract: A device for supplying power from a vehicle battery to the outside is provided. The device includes an inverter circuit having a bridge circuit with multiple switching elements and that converts the received DC power into the AC power by switching the switching elements and that outputs the AC power. A controller controls an on/off state of each switching element through pulse width modulation. When an output AC output to the load has a value greater than a preset reference value or an input direct current input into the inverter has a value greater than a preset reference value, the controller changes a duty of each switching element to reduce an output AC voltage output from the inverter. When the reduced output AC voltage has a value equal to or less than a preset reference value, the controller stops a power conversion operation of the inverter.

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 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: An LLC resonance converter and a charging system having the same capable of resolving excessive current generation and output voltage divergence that occur at the time of initial startup, on the basis of the characteristic of the LLC resonance converter whose output is determined by LC resonance.

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. Legs of the plurality of legs are supplied with power by being connected with the power supply unit and both ends of each leg of the legs being connected with the battery. One or more switches are disposed between one or more legs of the plurality of legs and the power supply unit. A controller changes a power transmission path from the power supply unit by determining a phase of a power that is supplied from the power supply unit and by operating each switch of the one or more switches based on the phase of the supplied power.

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

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 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: 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: An LLC resonance converter and a charging system having the same capable of resolving excessive current generation and output voltage divergence that occur at the time of initial startup, on the basis of the characteristic of the LLC resonance converter whose output is determined by LC resonance.

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.