Patent application number | Description | Published |
20090261754 | LAMP DRIVING CIRCUIT - The present invention relates to a lamp driving circuit capable of achieving miniaturization by using a safe insulation type multi-output transformer. The lamp driving circuit in accordance with the present invention includes a rectification unit for rectifying an input voltage; a PFC (Power Factor Correction) unit for enhancing a power factor of a voltage rectified by the rectification unit and converting the rectified voltage into a DC voltage; a switching unit for switching the DC voltage of the PFC unit in order to convert the DC voltage into a square wave voltage; an insulation transformer unit which includes a transformer to secure safe insulation by including an input terminal and a ground terminal of one primary side and all output terminals of first and second secondary sides each of which includes two output terminals at sides facing each other and a resonant capacitor, and outputs a plurality of driving voltages which have the same amplitude and drive a plurality of lamps respectively by receiving the square wave voltages outputted from the switching unit; and an insulation feedback unit for sensing any one of the plurality of driving voltages and transmitting the driving voltage to the switching unit positioned at the primary side of the transformer, wherein the insulation feedback unit insulates the primary side of the transformer from the secondary side of the transformer. | 10-22-2009 |
20090316455 | SWITCHING MODE POWER SUPPLY CIRCUIT - 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. | 12-24-2009 |
20100237799 | LED DRIVING CIRCUIT - 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. | 09-23-2010 |
20120163038 | CONTROL CIRCUIT OF LLC RESONANT CONVERTER AND LLC RESONANT CONVERTER USING THE SAME - The present invention provides a control circuit of an LLC resonant converter including a minimum switching frequency variable circuit of varying a minimum switching frequency corresponding to an AC input voltage of the LLC resonant converter; and a first pulse signal generating unit and a second pulse signal generating unit to generate a first pulse signal and a second pulse signal based on a switching frequency limited by the minimum switching frequency variable circuit. | 06-28-2012 |
20150061805 | TRANSFORMER AND POWER SUPPLY DEVICE INCLUDING THE SAME - A transformer includes a magnetic core, a first coil unit and a second coil unit. The first coil unit is disposed within the magnetic core and includes a laminated board having layers laminated therein and conductive patterns. Respective ones of the conductive patterns are disposed on the laminated layers. The second coil unit includes a conductive wire spaced apart from the conductive patterns of the laminated board by an insulating distance. The conductive wire includes a triple-insulated wire surrounded by three sheets of insulating paper to maintain the insulating distance from the conductive patterns. | 03-05-2015 |
20150130574 | TRANSFORMER AND POWER SUPPLY DEVICE INCLUDING THE SAME - A transformer includes a magnetic core, a first coil unit and a second coil unit. The first coil unit is disposed within the magnetic core and includes a laminated board having layers laminated therein and conductive patterns. Respective ones of the conductive patterns are disposed on the laminated layers. The second coil unit includes a conductive wire spaced apart from the conductive patterns of the laminated board by an insulating distance. The conductive wire includes a triple-insulated wire surrounded by three sheets of insulating paper to maintain the insulating distance from the conductive patterns. | 05-14-2015 |
20150130575 | TRANSFORMER AND POWER SUPPLY DEVICE INCLUDING THE SAME - A transformer includes a magnetic core, a first coil unit and a second coil unit. The first coil unit is disposed within the magnetic core and includes a laminated board having layers laminated therein and conductive patterns. Respective ones of the conductive patterns are disposed on the laminated layers. The second coil unit includes a conductive wire spaced apart from the conductive patterns of the laminated board by an insulating distance. The conductive wire includes a triple-insulated wire surrounded by three sheets of insulating paper to maintain the insulating distance from the conductive patterns. | 05-14-2015 |
20150130578 | TRANSFORMER AND POWER SUPPLY DEVICE INCLUDING THE SAME - A transformer includes a magnetic core, a first coil unit and a second coil unit. The first coil unit is disposed within the magnetic core and includes a laminated board having layers laminated therein and conductive patterns. Respective ones of the conductive patterns are disposed on the laminated layers. The second coil unit includes a conductive wire spaced apart from the conductive patterns of the laminated board by an insulating distance. The conductive wire includes a triple-insulated wire surrounded by three sheets of insulating paper to maintain the insulating distance from the conductive patterns. | 05-14-2015 |