Abstract: A transformer is provided that includes a core and a coil part. The coil part includes primary and secondary coils that are wound on the core in different directions.

Abstract: A heat dissipation structure of transformer includes a bobbin formed with a hollow shape and wound with a primary coil and a secondary coil. A core surrounds an inside and an outside of the bobbin by combining a pair of upper cores with a pair of lower cores. A heat dissipating plate is disposed between the pair of upper cores and the pair of lower cores. According to an exemplary embodiment of the present disclosure, heat generated inside of the core can be effectively exhausted outside by a heat dissipating plate disposed in the center of the core.

Abstract: A full bridge DC-DC converter to which a current doubler is applicable is provided and includes a transformer and a switching circuit that converts a high direct current voltage into a high alternating current voltage and then outputs the high alternating current voltage to the primary side of the transformer. In addition, an output circuit receives and processes the output of the secondary side of the transformer and supplies the processed output to an electric load. The output circuit includes a first inductor, a first contact resistor, a second inductor, a second contact resistor, a first diode, a third contact resister, a second diode, and a fourth contact resister.

Abstract: A switching power supply device includes a full-bridge circuit comprising a plurality of switching devices, a transformer comprising a primary coil and a secondary coil, the primary coil being connected to an output of the full-bridge circuit, and a DC/DC converter comprising a rectifier circuit. The rectifier circuit includes a plurality of diodes and is connected to the secondary coil to rectify a voltage outputted from the secondary coil. A snubber circuit includes a first snubber diode connected to an intermediate point of the secondary coil, a second snubber diode connected in series with the first snubber diode, the second snubber diode being connected to one end of an output capacitor, and a snubber capacitor connected between a node between the first and second snubber diodes and a positive side output of the rectifier circuit.

Abstract: An on-board charger for charging a battery of an eco-friendly vehicle and a method for charging a battery using the on-board charger are provided. The on board charger reduces an output current ripple by improving a snubber circuit unit of the on-board charger for charging a battery in plug-in hybrid and electric vehicles. In addition, the on-board charger for charging a battery of an eco-friendly vehicle reduces a surge voltage generated in a rectifier diode and reduces an output current ripple by arranging two capacitors and three diodes in a transformer secondary rectifier of the on-board charger.

Abstract: A full bridge DC-DC converter to which a current doubler is applicable is provided and includes a transformer and a switching circuit that converts a high direct current voltage into a high alternating current voltage and then outputs the high alternating current voltage to the primary side of the transformer. In addition, an output circuit receives and processes the output of the secondary side of the transformer and supplies the processed output to an electric load. The output circuit includes a first inductor, a first contact resistor, a second inductor, a second contact resistor, a first diode, a third contact resister, a second diode, and a fourth contact resister.

Abstract: A magnetic connector apparatus that charges an electric vehicle through contactless magnetic coupling. The magnetic connector apparatus includes an external charger, an inlet, and a magnetic connector. The inlet is connected to a rechargeable battery of the vehicle. The magnetic connector is connected to a power source of the external charger and is transferred to the vehicle to be inserted into the inlet.

Abstract: A method for controlling a cooling system for controlling a power converter of a hybrid electric vehicle includes: estimating the temperature of a power converter at the time of a CAN communication error as a current temperature of the power converter and controlling a cooling system at a cooling rate based on the estimated temperature; and controlling the cooling rate of the cooling system depending on whether an output of the power converter is greater than a reference value. According to the method, the cooling system can be more effectively controlled.

Abstract: A method for controlling a cooling system for controlling a power converter of a hybrid electric vehicle includes: estimating the temperature of a power converter at the time of a CAN communication error as a current temperature of the power converter and controlling a cooling system at a cooling rate based on the estimated temperature; and controlling the cooling rate of the cooling system depending on whether an output of the power converter is greater than a reference value. According to the method, the cooling system can be more effectively controlled.

Abstract: An apparatus and method for controlling a back light in a mobile terminal is provided, in which a first back light of a liquid crystal display and a second back light of a key pad are independently controlled. The first and second back lights are driven if a flip cover is opened, while the first back light is only driven if the function selection key is input. Since the second back is not driven when the function selection key is input, unnecessary power consumption can be reduced.