Abstract: There is provided a planar transformer having improved performance through a reduction in heat generation by removing part of a conductor from a substrate. The planar transformer includes a core part having a pair of cores being electromagnetically coupled to each other; a substrate part having at least one substrate disposed between the pair of cores; a pattern part formed on the at least one substrate and including a conductor having an adjustable width; and an opening part including a non-conductor allowing for variations in the width of the conductor of the pattern part.

Abstract: There is provided a backlight unit driver capable of driving multi-channel lamps of a backlight unit, especially LED lamps, by supplying a driving power to the lamps using a single transformer and maintaining the current balance of the driving power supplied to each of the lamps.

Abstract: There is provided a flat panel display device, including: a display panel; a printed circuit board on which a circuit component driving the display panel is mounted; a common mode filter mounted on the printed circuit board and including coils wound in parallel with the printed circuit board; and a cover protecting the display panel and the printed circuit board.

Abstract: There are provided a power module and a display device. There is provided the power module for a display device that includes a panel, a backlight unit supporting the panel and including a light source, and a conductive back cover coupled to the backlight unit, the power module including: a circuit board supplying power to the light source included in the backlight unit; a transformer mounted on the circuit board and supplying power to the circuit board; and a shielding plate mounted on the circuit board and covering, in a non-contact manner, the upper surface of the transformer opposed to the lower surface 401 of the transformer facing the surface of the circuit board. There is provided a display device including such a power module.

Abstract: The present invention provides an LED driving circuit including: an inverter unit for switching an input power source; a plurality of transformers including a plurality of primary windings connected to the inverter unit and connected to each other in series and a plurality of secondary windings each of which is coupled with each of the primary windings; a plurality of rectification units each of which is connected to each of the secondary windings; and a plurality of LEDs each of which is connected to each of the rectification units.

Abstract: A switching mode power supply (SMPS) circuit includes: a rectifying unit that rectifies an AC voltage applied from an AC input terminal; a power factor correction (PFC) and standby voltage output unit that is connected to the rectifying unit and has a PFC part and a standby voltage output part integrated therein; a PFC and standby voltage control unit that is connected to the PFC and standby voltage output unit and controlling the PFC and standby voltage output unit; and a DC/DC conversion unit that is connected to the PFC and standby voltage output unit and outputting a main voltage.

Abstract: The present invention relates to a lamp driving circuit capable of achieving miniaturization by using a safe insulation type multi-output transformer.

Abstract: There is provided a power factor corrected circuit having an integrated coil in which a plurality of inductors that have been separately used for circuits are wound around one core. The power factor corrected circuit includes a rectifying unit for rectifying a common AC power supply; a coil unit for controlling the change in electric current of the rectified power supply from the rectifying unit according to the switching operation; and a switching unit for complementarily switching the power supply from the coil unit, wherein the coil unit has a core including first and second coils electrically coupled to each other; and first, second and third legs magnetically coupled to each other, and the first coil is wound around the first leg, the second coil is wound around the second leg, and the third leg is combined with the first and the second leg to form magnetic flux paths, respectively.

Abstract: The present invention relates generally to circuit for stabilizing a voltage, and more particularly to a power supply circuit of a power factor compensation type maintaining a PFC output voltage to be either of daulized magnitudes according to an input voltage after classifying the input voltages by a certain critical voltage range, thus improving an efficiency by 2 to 3% in case of the low AC input voltage.