| Patent application number | Description | Published |
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| 20090167474 | TRANSFORMER IMPROVED IN LEAKAGE INDUCTANCE - There is provided a transformer improved in leakage inductance including: a core having first, second and third legs electromagnetically coupled to one another; a primary winding formed of a conductor having one end and another end receiving power from the outside and dividedly wound around the first, second and third legs; and a secondary winding wound around at least one of the first, second and third legs and receiving induced power by electromagnetic induction with the primary winding. | 07-02-2009 |
| 20090168476 | BRIDGELESS POWER FACTOR CORRECTION CIRCUIT - There is provided a bridgeless power factor correction circuit that corrects a power factor by complementarily switching two switches according to phase of input power without using rectifier bridge diodes. A bridgeless power factor correction circuit according to an aspect of the invention may include: a switching unit having a plurality of switches and alternately switching input AC power; a stabilizing unit rectifying and smoothing the power switched by the switching unit; and a control unit controlling an alternate switching operation between the plurality of switches according to phases of the input power. | 07-02-2009 |
| 20090231885 | INTEGRATED TRANSFORMER AND POWER SUPPLY USING THE SAME - There are provided an integrated transformer in which a power conversion transformer and an inductor for stabilizing output power by the transformer are integrated into one transformer structure, and a power supply using the same. An integrated transformer according to an aspect of the invention includes: a core part including: first and second supports; and first and second outer legs and a center leg provided between the first and second supports, and magnetically connecting the first and second supports to each other, wherein a cross-section of the first and second outer legs and a cross-section of the center leg have a width of the first support and a width of the second support in a longitudinal direction, respectively, and a width of each of the first and second outer legs exceeds 0.5 times a width of the center leg but does not exceed 2 times the width of the center leg. | 09-17-2009 |
| 20100014321 | VARIABLE SWITCHING FREQUENCY TYPE POWER SUPPLY - There is provided a variable switching frequency type power supply that can achieve high efficiency by fixing a switching duty cycle to 50% and varying switching frequency. A variable switching frequency type power supply according to an aspect of the invention may include: a switching unit switching input power; a transformation unit converting a voltage level of the power switched by the switching unit into a predetermined voltage level; a rectification unit rectifying the power converted by the transformation unit; and a control unit fixing a switching duty cycle of the switching unit to a predetermined switching duty cycle, and varying switching frequency of the switching unit according to a voltage level of output power. | 01-21-2010 |
| 20110032062 | TRANSFORMER IMPROVED IN LEAKAGE INDUCTANCE - There is provided a transformer improved in leakage inductance including: a core having first, second and third legs electromagnetically coupled to one another; a primary winding formed of a conductor having one end and another end receiving power from the outside and dividedly wound around the first, second and third legs; and a secondary winding wound around at least one of the first, second and third legs and receiving induced power by electromagnetic induction with the primary winding. | 02-10-2011 |
| 20110273112 | LIGHT EMITTING DRIVER - There is provided a light emitting driver. A light emitting driver according to an aspect of the invention may include: an LED driving section driving a light emitting part according to a detection value of the light emitting part including a plurality of light emitting devices; and a detection section transmitting the detection value to the LED driving section according to a detection voltage corresponding to a magnitude of a driving current flowing through the light emitting part when an output voltage, being applied to the light emitting part, has a value smaller than a predetermined output voltage reference value, and transmitting the detection value to the LED driving section according to a magnitude of the output voltage. | 11-10-2011 |
| 20110309684 | APPARATUS AND METHOD FOR THE ANTI-ISLANDING OF POWER CONDITIONING SYSTEM - There is provided an apparatus for the anti-islanding of a power conditioning system. The apparatus for the anti-islanding of a power conditioning system according to the present invention is applied to a power conditioning system including a DC/DC converter and a DC/AC inverter in order to transfer power from a solar cell array to a grid. The apparatus for the anti-islanding of a power conditioning system may include an injection signal generator generating an injection signal, an adder generating a final fundamental wave command value, a main controller performing the power control according to the final fundamental wave command value and stopping the operation of the power conditioning system when the level of the detected injection signal has reached the predetermined reference level or more, and an injection signal detector detecting the injection signal included in voltage and providing them to the main controller. | 12-22-2011 |
| 20120026758 | APPARATUS AND METHOD FOR CONTROLLING SWITCH OF FLYBACK CONVERTER FOR SOLAR GENERATING SYSTEM - There is provided an apparatus and method for controlling a switch of a flyback converter for a solar generating system. The apparatus for controlling a switch of a flyback converter for a solar generating system includes: an MPPT controller generating a current command value for a maximum power point tracker of a solar cell module, based on input voltage, input current, and output voltage of the flyback converter; a current controller generating a current control signal for tracking the current command value; an output current command value generator generating the phase and magnitude command value of the output current, based on the phase of the output voltage and the current control signal; and a switch controller controlling the main switch of the flyback converter, based on the phase and magnitude command value of the output current, thereby simplifying a circuit while solving disadvantages of a discontinuous conduction mode and a boundary conduction mode. | 02-02-2012 |
| 20120043811 | POWER SUPPLY HAVING IMPROVED SYSTEM EFFICIENCY - A power supply having improved system efficiency includes: a standby stage converting a DC voltage into an operating voltage and a first standby voltage, which have a preset magnitude, and supplying the first standby voltage to a standby output terminal; a DC/DC stage supplied with the operating voltage from the standby stage, converting the DC voltage into a main voltage having a preset magnitude, and supplying the main voltage to a main output terminal; and a main/standby stage converting the main voltage from the DC/DC stage into a second standby voltage having a preset magnitude, and supplying the second standby voltage to the standby output terminal. | 02-23-2012 |
| 20120155119 | POWER CONVERTER INTEGRATED WITH FLYBACK CONVERTER - There is provided a power converter integrated with an auxiliary converter. The power converter includes: a flyback converter converting an input power of a power supply input terminal into a standby power through a primary side circuit connected to the power supply input terminal and a secondary side circuit magnetically coupled to the primary side circuit to supply the standby power; and a main converter converting the input power of the power supply input terminal into a main power to supply the main power, and converting the input power of the power supply input terminal into the standby power through the secondary side circuit of the flyback converter to supply the standby power, whereby the efficiency of the power converter may be improved. | 06-21-2012 |
| Patent application number | Description | Published |
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| 20090322257 | SWITCHING MODE POWER SUPPLY FOR PLASMA DISPLAY PANEL - In accordance with the present invention, the SMPS circuit for PDP includes first and second transformers inducing voltages supplied to primary sides to secondary sides; a plurality of DC/DC converters connected to secondary sides of the first and second transformers and supplying voltages of different sizes; a clamp circuit connected to the secondary side of the first transformer and outputting an address voltage of a predetermined size by receiving a voltage supplied from the first transformer; and a linear regulator unit connected to the DC/DC converter for supplying a low voltage among the DC/DC converters connected to the secondary side of the first transformer and outputting a gate voltage of a predetermined size by receiving the low voltage supplied from the DC/DC converter. | 12-31-2009 |
| 20100002471 | PHASE SHIFT FULL BRIDGE CONVERTER WITH REDUCED CURRENT STRESS - A phase shift full bridge converter with a reduced current stress includes: a switching unit that switches an input voltage; a transformer that includes a first capacitor serially connected to, and having a primary side and a secondary side; an auxiliary circuit unit that includes a first switch, a second switch, and a second capacitor, which are connected in parallel to the secondary side of the transformer; and a rectification unit that is connected to the auxiliary circuit unit, with an output inductor being removed. | 01-07-2010 |
| 20100033993 | TRANSFORMER HAVING RESONANT INDUCTANCE - Provided is a transformer having resonant inductance, the transformer including a core that includes a first leg formed in one side thereof, a second leg which is formed in the other side thereof so as to be electromagnetically coupled to the first leg, and a third leg which is formed between the first and second legs so as to be electromagnetically coupled to the first and second legs; a primary winding that is wound around one side of the third leg; a secondary winding that is wound around the other side of the third leg so as to induce power through electromagnetic induction with the primary winding; and a resonant inductance winding that is wound around the outside of the core so as not to be magnetically induced by magnetic fluxes generated from the primary and secondary windings. | 02-11-2010 |
