Patent application number | Description | Published |
20140010474 | APPARATUS AND METHOD FOR CORRECTING IMAGE DISTORTION OF REAR CAMERA - An apparatus for correcting image distortion of a rear imaging device including analyzing, by a processor, a characteristic of a imaging device installed in a rear of a vehicle; setting, by the processor, a plurality of tilting angles for a plurality of photographed areas of a virtual imaging device corresponding to the rear imaging device from a characteristic value of the imaging device; generating, by the processor, a correction model by applying the plurality of tilting angles for the plurality of photographed areas of the virtual imaging device; tilting, by the processor, the virtual imaging device based on the correction model; performing, by the processor, a view conversion on an image photographed through the rear imaging device according to the plurality of set tilting angles for the plurality of photographed areas of the virtual imaging device to generate a corrected image; and outputting, by the processor the corrected image. | 01-09-2014 |
20140114529 | APPARATUS AND METHOD FOR ASSISTING PARKING IN AREA WITHOUT PARKING LINE - Disclosed herein are an apparatus and a method for assisting parking on an area without a parking line. The apparatus includes a processor configured to: analyze a plurality of images obtained by photographing surroundings of a vehicle to detect distance information based on a ground surface in a vicinity of the vehicle; detect a plurality of obstacles in the vicinity of the vehicle based on a plurality of sensor values acquired by a plurality of sensors; determine a possible parking area in the area without a parking line in the vicinity of the vehicle based on the analysis of the plurality of images and the detected obstacles; set a selected area in the possible parking area as a parking area; and provide a parking assist service to the set parking area. | 04-24-2014 |
20140119597 | APPARATUS AND METHOD FOR TRACKING THE POSITION OF A PERIPHERAL VEHICLE - The present disclosure provides an apparatus and a method for tracking a position of a peripheral vehicle. The apparatus includes: a processor; memory; an image obtaining unit configured to receive one or more images from one or more cameras disposed on a vehicle; a peripheral vehicle detecting unit configured to analyze the one or more images to detect a peripheral vehicle in the peripheral one or more images; a position tracking unit configured to track the peripheral vehicle detected in the peripheral one or more images; a view converting unit configured to generate a view-converted image by converting a view of the peripheral image based on the tracked position of the peripheral vehicle; and an output controlling unit configured to output the view-converted image to a display provided in the vehicle. | 05-01-2014 |
20140160289 | APPARATUS AND METHOD FOR PROVIDING INFORMATION OF BLIND SPOT - Disclosed is an apparatus and method for providing information regarding a blind spot in a vehicle. The apparatus includes a view transforming area detector that is configured to detect a predefined side area and rear side area from a captured image input from a side imaging device. The imaging device is configured to capture the image including the blind spot of the vehicle. Additionally, the apparatus includes a view transformer that is configured to view transform an image of the side area and an image of the rear side area based on a pre-set view transformation parameter and generate view transformed images corresponding to the images of the side area and the rear side area. | 06-12-2014 |
20150097954 | METHOD AND APPARATUS FOR ACQUIRING IMAGE FOR VEHICLE - A method and apparatus for acquiring an image for a vehicle are provided. The apparatus includes an input that receives a user input and at least one imaging device that acquires an external image data of the vehicle. A sensor that includes at least one sensor is configured to confirm a state of the vehicle and a display is configured to display a region around the vehicle to be divided into a plurality of regions based on the vehicle. A controller selects a virtual projection model based on a selected region or a state change of the vehicle when at least one of the plurality of regions is selected from the user input or the state change of the vehicle is sensed by the sensor, and project the external image data onto the virtual projection model, to generate final image data that corresponds to a position of the selected region. | 04-09-2015 |
Patent application number | Description | Published |
20100029297 | WIRELESS DATA COMMUNICATION SYSTEM AND METHOD FOR PROVIDING WIRELESS DATA SERVICE TO SDR TERMINAL - A wireless data communication system includes a software defined radio (SDR) terminal having a wireless map, and accessing a desired wireless data service using the wireless map, wherein the wireless map includes GPS location information, information on wireless data services available at a current location of the SDR terminal based on the GPS location information and information on wireless connection software components for each wireless data service selected by the SDR terminal. The wireless data communication system further includes a base station for providing a wireless connection environment, an authentication center for authenticating the SDR terminal, a download server for providing the wireless connection software component to the SDR terminal, and a location-based service server for providing the wireless map to the SDR terminal. | 02-04-2010 |
20100035623 | METHOD AND APPARATUS FOR CONTROLLING QUALITY OF SERVICE IN MOBILE COMMUNICATION SYSTEM - A method for controlling quality of service (QoS) in a mobile communication system includes configuring a service model to operate radio resources, based on an application to provide a requested service from a subscriber terminal; forming a QoS profile using the service model; allocating the radio resources for each requested services in accordance with the QoS; providing information on the allocated radio resources to the application; monitoring a condition of the allocated radio resource; and controlling the QoS by reflecting information obtained from the monitored condition. | 02-11-2010 |
20110141972 | TNL CONNECTION SETUP METHOD AND APPARATUS FOR BASE STATION USING DOWNLINK RECEIVER - A Transport Network Layer (TNL) connection setup method for a base station includes monitoring Physical Cell Identity (PCI) values of neighboring cells. When it is monitored that the PCI values are changed, IP addresses of neighboring base stations corresponding to the changed PCI values are acquired. Thereafter, it is determined whether it is necessary to perform a new TNL connection setup with respect to other neighboring base stations, based on the changed PCI values and the acquired IP addresses. When it is determined that it is necessary to perform the new TNL connection setup, the TNL connection setup is performed with the acquired IP addresses. | 06-16-2011 |
20110142004 | SMALL BASE STATION APPARATUS AND CELL SEARCH METHOD - A small base station apparatus includes: a communication unit for collecting system information of a neighboring cell through mobile communication terminals being connected to a cell of the small base station apparatus; a memory unit for storing the system information of the neighboring cell; and a controller for checking whether or not a mobile communication terminal is allowed a handover connection to the neighboring cell based on the system information of the neighboring cell, registering the neighboring cell in a handover candidate list of the mobile communication terminal if the mobile communication terminal is allowed the handover connection, selecting one of neighboring cells registered in the handover candidate list, and performing handover of the mobile communication terminal to the selected neighboring cell. | 06-16-2011 |
20110143737 | METHOD FOR ESTABLISHING BASE STATION INFORMATION OF FEMTOCELL BASE STATION, AND FEMTOCELL BASE STATION APPLIED THEREWITH - A method for setting base station information of a femtocell base station includes: upon a power application to the femtocell base station, setting all or some of terminals accessing the femtocell base station as console terminals; and receiving a radio environment parameter related to radio environment around each console terminal from the console terminals through a communication interface unit. The method further includes setting the base station information including an operation mode of the femtocell base station and a cell identifier of a femtocell covered by the femtocell base station based on the first radio environment parameter. | 06-16-2011 |
20110143763 | METHOD AND APPARATUS FOR CONTROLLING OPERATION MODE OF FEMTOCELL BASE STATION - A method for controlling an operation mode of a femtocell base station includes receiving a channel quality indicator of a downlink channel between the femtocell base station and a terminal, which is transmitted from the terminal; calculating a communication quality between the femtocell base station and the terminal based on the channel quality indicator; determining whether or not an interference factor has occurred in communication between the femtocell base station and the terminal based on the communication quality; and changing or maintaining an operation mode of the femtocell base station based on the determination result. The communication quality may be calculated when the operation mode of the femtocell base station is allowed to be changed. | 06-16-2011 |
20110143783 | METHOD AND APPARATUS FOR PAGING OPTIMIZATION OF BASE STATION SUPPORTING HYBRID CELL - A method for paging optimization in a communication system having one or more base stations and one or more mobile stations within a paging target cell, includes detecting a hybrid base station supporting a hybrid cell from the one or more base stations; and determining whether or not one or more mobile stations registered in the hybrid cell include only closed subscriber group (CSG) members, and defining an operating state of the hybrid base station based on the determination result. The method further includes determining whether or not each of the one or more base stations is included in paging targets based on the operating state of the hybrid base station. | 06-16-2011 |
20110151907 | METHOD AND APPARATUS FOR CONTROLLING INTERFERENCE BETWEEN BASE STATIONS - A method for controlling interference between base stations in a radio communication system in which an indirect interface for indirectly connecting the base stations exists and an direct interface for directly connecting the base stations does not exist, the method includes: converting a first interference control message used in the direct interface into a format of a protocol of the indirect interface to thereby generate a second interference control message; and transmitting the second interference control message through the indirect interface. | 06-23-2011 |
20110151920 | HANDOVER CONTROLLING METHOD AND APPARATUS - A method for controlling a handover from a source base station to a target base station determines whether a direct interface connecting the source base station and the target base station exists, compares a link latency of the direct interface with a link latency of an indirect interface connecting the source base station and the target base station when it is determined that the direct interface exists, and selects a handover execution interface, between the direct interface and the indirect interface, based on the comparison result. | 06-23-2011 |
20120165017 | METHOD OF OPERATING CLOSED-MODE BASE STATION AND NON-SUBSCRIBER TERMINAL - A method of operating a closed-mode base station, includes broadcasting an interference preamble for providing a notification of an interference situation via a broadcast of system information; checking current service status of the closed-mode base station when the interference situation is reported from a non-subscriber terminal entered a service area of the closed-mode base station; and avoiding the interference situation based on the checked current service status. | 06-28-2012 |
20130210439 | SYSTEM FOR TRANSMITTING SYSTEM INFORMATION OF LTE-BASED FEMTOCELL - Provided are a mobile communication system comprising a femto base station for transmitting system information, and a terminal for receiving the system information from the femto base station. The terminal receives the system information from the femto base station, and during other times, receives data from a serving macro base station. | 08-15-2013 |
20140320399 | WEARABLE ELECTRONIC DEVICE AND METHOD OF CONTROLLING THE SAME - A wearable electronic device with a function of adjusting light transmittance, and a method of controlling the wearable electronic device are disclosed. The wearable electronic device according to an exemplary embodiment includes a transparent or light-transmitting lens, a liquid crystal installed at the lens, a camera taking a picture of a front view of a user wearing the wearable electronic device, a display part displaying an additional information to the lens, which is added to a front view recognized by the user, and a control part determining an operation mode of the wearable electronic device whether the operation mode is a transparent mode or an opaque mode, controlling liquid crystal to adjust light transmittance according to the determined operation mode, and controlling the display part to display the additional information when the operation mode is changed to be the transparent mode or the opaque mode. | 10-30-2014 |
20140320532 | WEARABLE ELECTRONIC DEVICE AND METHOD OF CONTROLLING THE SAME - A wearable electronic device capable of helping a user for remembering a person whom the user meets, and a method of controlling the wearable electronic device are disclosed. The wearable electronic device includes a transparent or light-transmitting lens, a camera taking a picture of a front view of a user wearing the wearable electronic device, a display part displaying an additional information to the lens, which is added to a front view recognized by the user, and a control part detecting a past image including a human face that is similar to a human face in a real image of a front view, and controlling the display part to display the past image as a sub information. | 10-30-2014 |
20150156196 | WEARABLE ELECTRONIC DEVICE AND METHOD FOR CONTROLLING SAME - The present invention relates to a wearable electronic device and to a method for controlling same, wherein the device includes: at least one lens; a display device allowing information to be displayed on the lens; a sensing unit obtaining bio-information of a user; and a control unit performing user authentication by using the obtained user bio-information to control functions of the wearable electronic device according to the user authentication result. | 06-04-2015 |
Patent application number | Description | Published |
20120157077 | METHOD FOR DYNAMIC CHANGE OF OPERATION MODE IN WIRELESS COMMUNICATION SYSTEM - Disclosed is a method of operating a femto base station (BS) in a wireless communication system, the method comprising: receiving an access request comprising a closed subscriber group (CSG) identifier (ID) from user equipment (UE); determining a number N of UE accessing the femto BS; ascertaining an access type to determine whether the UE is a CSG UE or a non-CSG UE of the femto BS on the basis of the CSG ID of the UE; and determining whether to admit access of the UE on the basis of the access type, the N and access admittable information, the access admittable information comprising U | 06-21-2012 |
20120157154 | METHOD FOR CONTROLLING TRANSMISSION POWER IN FEMTO BASE STATION AND APPARATUS THEREOF - A method and an apparatus for controlling transmission power in a femto base station is provided. The method includes: predicting femto base station interference to be given from an adjacent femto base station to a terminal; predicting macro base station interference to be given from a macro base station to the terminal; determining transmission power for the terminal; and transmitting a downlink signal to the terminal on the basis of the transmission power, wherein the femto base station interference is predicted on the basis of a distance between serving femto base station and the adjacent femto base station and the transmission power of the adjacent femto base station, and the macro base station interference is predicted on the basis of a distance between serving femto base station and the macro base station and the transmission power of the macro base station. | 06-21-2012 |
20120165027 | COMMUNICATION SYSTEM INCLUDING FEMTO BASE STATION - Provided is a terminal to transmit wireless environment measurement information to a femto base station, and the femto base station to receive the wireless environment measurement information from the terminal. The femto base station may perform initialization based on the wireless environment measurement information, or may transmit the wireless environment measurement information to a base station control unit. The base station control unit may determine whether to additionally install a second femto base station based on the wireless environment measurement information. | 06-28-2012 |
20120244878 | APPARATUS AND METHOD FOR IDENTIFYING TERMINAL LOCATED IN SPACE INCLUDING SMALL BASE STATION - The present invention provides a method including two operations of a first operation and a second operation. The first operation may determine between a terminal located in a space including the small base station and a terminal located in a space excluding the small base station based on a value reported by a terminal. The second operation may be performed using information received from a neighboring macro base station in response to the determination failing to be performed in the first operation, thereby ultimately discriminating between an area including the small base station and an area excluding the small base station corresponding to a location of a terminal. | 09-27-2012 |
20130148523 | METHOD OF ALLOTTING CARRIER TO STATION - Disclosed is a carrier wave allotting method of an operation and maintenance system in a wireless communication network. The carrier wave allotting method includes searching a wireless resource of the wireless communication network; updating cell information indicating information of cells of the wireless communication network; searching an access mode of a station connected with the operation and maintenance system; searching a wireless capacity of the station; and allotting a carrier wave to the station according to the wireless resource, the cell information, the access mode, and the wireless capacity. | 06-13-2013 |
20130150042 | OPERATING METHOD OF CSG FEMTO BASE STATION, HANDOVER METHOD OF HANDOVER TO CSG FEMTO BASE STATION AND MANAGING METHOD OF MANAGING INFORMATION OF NEIGHBORING CSG FEMTO CELL - Disclosed is an operating method of a femto base station which includes broadcasting a plurality of public land mobile network (PLMN) identities; broadcasting a plurality of closed subscriber group (CSG) identities correlated with the plurality of PLMN identities; and establishing wireless communication with user equipment based on the broadcasted PLMN and CSG identities. | 06-13-2013 |
20130150127 | WIRELESS COMMUNICATION BASE STATION HAVING DYNAMIC CELL STRUCTURE - Disclosed is a wireless communication base station which includes a plurality of radio units configured to transmit and receive a radio signal; and a digital unit connected to the plurality of radio units via cables and configured to operate a communication protocol. The digital unit controls the plurality of radio units according to a communication environment to be switched into a merge state in which the plurality of radio units forms a cell, or an independent state in which the plurality of radio units forms different cells, respectively. | 06-13-2013 |
20130157712 | METHOD OF MANAGING MOBILITY USING COORDINATED MULTIPLE POINT COMMUNICATION - Provided is a method of managing mobility of a user equipment. The method includes: establishing by a first base station a communication with the user equipment; transmitting by the first base station a Coordinated Multiple Point (CoMP) addition request to a second base station; establishing by the first and second base stations a CoMP communication with the user equipment according to the CoMP addition request; transmitting by the first base station an anchor cell change request to the second base station; and operating the second base station as an anchor cell of the CoMP communication according to the anchor cell switch request. | 06-20-2013 |
20140321374 | RADIO RESOURCE ALLOCATION APPARATUS AND METHOD USING INTERFERENCE INDICATOR IN FEMTO CELL NETWORK - A radio resource allocation apparatus and method using an interference indicator in a femto-cell network are disclosed. The radio resource allocation apparatus using an interference indicator in a femto-cell network includes: an interference indicator obtaining unit obtaining any one or more of interference indicators including load information of a base station in the femto-cell network, a change amount of reference signal received power (RSRP) to reference signal received quality (RSRQ), and a channel quality indicator (CQI); a priority determining unit providing different weights to each of the interference indicators and determining an allocation priority of radio resources using the interference indicators to which the weights are provided; and a radio resource allocating unit allocating the radio resources to the base station in any one of a dedicated carrier mode, a partially shared carrier mode, and a shared carrier mode using the allocation priority. | 10-30-2014 |
Patent application number | Description | Published |
20090064347 | Protection Against Unauthorized Copying of Digital Medial Cotent - Protection against unauthorized copying of digital media content is achieved by receiving information from a client device related to its storing function used to store digital media content that is to be sent to the client device; and performing a procedure to protect against unauthorized copying of the digital media content if the client device is able to store the digital media content using its storing function. | 03-05-2009 |
20090064348 | Protection Against Unauthorized Copying of Digital Medial Cotent - Protection against unauthorized copying of digital media content is achieved by receiving a request to provide digital media content to a client device, sending instructions to the client device regarding a processor executable function that provides protection against unauthorized copying of the digital media content, and sending the digital media content to the client device upon activation of the processor executable function. | 03-05-2009 |
20110185034 | METHOD FOR PROVIDING CONTENTS TO CLIENT AND SERVER USING THE SAME - A method for providing one or more contents to a client is disclosed. The method comprise receiving a request for one or more specific contents from the client; transmitting, to the client, a contents reproducer, which allows a user of the client to define at least one new command and to define an external appearance of the contents reproducer, wherein the external appearance includes an object to be represented as the new command; and transmitting, to the client, the requested contents thereby to be reproduced using the contents reproducer. | 07-28-2011 |
20140182707 | DRAIN APPARATUS - A drain apparatus may include a storage chamber that has a through-hole through which a coolant, which leaks through a mechanical seal sealing an impeller shaft of a water pump in a vehicle, flows inside, and stores the coolant flowing inside via the through-hole, and a discharge tube that may be disposed vertically through a bottom of the storage chamber, with an upper end thereof extending to the inside of the storage chamber such that a height thereof may be positioned between a top and the bottom of the storage chamber. | 07-03-2014 |
Patent application number | Description | Published |
20130076382 | Apparatus and Method for Measurement of Radiation Intensity for Testing Reliability of Solar Cell, and Method for Testing Reliability of Solar Cell - An apparatus and method for measurement of radiation intensity for testing reliability of a solar cell, and a method for testing the reliability of the solar cell. The apparatus includes a first solar cell receiving a predetermined intensity of radiation or more to generate electricity, a second solar cell receiving a predetermined intensity of radiation or more to generate electricity; a temperature sensor sensing a temperature of the second solar cell; a cooler cooling the first solar cell; and a controller measuring the intensity of radiation applied to the first solar cell, and controlling the cooler to prevent the temperature of the first solar cell from increasing above a predetermined temperature depending on the temperature of the second solar cell sensed by the temperature sensor. | 03-28-2013 |
20140065760 | METHOD OF FORMING ZINC OXIDE PROMINENCE AND DEPRESSION STRUCTURE AND METHOD OF MANUFACTURING SOLAR CELL USING THEREOF - A method of forming a nanometer-scale prominence and depression structure on a zinc oxide thin film in a wet-etching method, and the method includes the steps of: preparing a substrate; forming a nano structure having a height and a width of a nanometer range; forming the zinc oxide thin film on the substrate on which the nano structure is formed; and wet-etching the zinc oxide thin film, in which in the wet-etching step, zinc oxide having relatively low physical compactness is preferentially etched since the zinc oxide is positioned on the nano structure, and thus the prominence and depression structure is formed around the nano structure by the etching. | 03-06-2014 |
20140083501 | TRANSPARENT CONDUCTING FILM HAVING DOUBLE STRUCTURE AND METHOD OF MANUFACTURING THE SAME - Disclosed is a double-structure transparent conducting film having both excellent electrical characteristics and excellent light trapping performance, and a method of manufacturing the same. | 03-27-2014 |
20140338736 | METHOD FOR MANUFACTURING CZTS BASED THIN FILM HAVING DUAL BAND GAP SLOPE, METHOD FOR MANUFACTURING CZTS BASED SOLAR CELL HAVING DUAL BAND GAP SLOPE AND CZTS BASED SOLAR CELL THEREOF - A method for manufacturing a CZTS based thin film having a dual band gap slope, comprising the steps of: forming a Cu | 11-20-2014 |
20150114466 | CIGS Solar Cell Having Flexible Substrate Based on Improved Supply of Na and Fabrication Method Thereof - A CIGS solar cell having a flexible substrate based on improved supply of Na. The CIGS solar cell includes a substrate formed of a flexible material, a rear electrode formed on the substrate, a CIGS light-absorption layer formed on the rear electrode, a buffer layer formed on the CIGS light-absorption layer, and a front electrode formed on the buffer layer, wherein the rear electrode comprise a single-layered Na-added metal electrode layer. A single-layered Na-added Mo electrode layer, specific resistance of which is about 1/10th the specific resistance under conditions of a process of forming a typical multilayer rear electrode, is applied to the rear electrode, thereby providing a CIGS solar cell having a flexible substrate and high conversion efficiency. | 04-30-2015 |
20150162480 | METHOD OF MANUFACTURING CI(G)S-BASED THIN FILM HAVING REDUCED CARBON LAYER, THIN FILM MANUFACTURED BY THE METHOD, AND SOLAR CELL COMPRISING THE THIN FILM - Disclosed is a method of manufacturing a CI(G)S-based thin film, in which a slurry prepared by mixing two or more kinds of binary nanoparticles containing CI(G)S-based elements, a solution precursor containing a CI(G)S-based element, an alcoholic solvent and a chelating agent is used to reduce the carbon layer formed between the CI(G)S-based thin film and molybdenum, and which includes (a) mixing two or more kinds of binary nanoparticles containing CI(G)S-based elements, a solution precursor containing a CI(G)S-based element, an alcoholic solvent and a chelating agent, thus preparing a slurry; (b) subjecting the slurry to non-vacuum coating, thus forming a CI(G)S-based thin film; and (c) subjecting the CI(G)S-based thin film to selenization heat treatment. | 06-11-2015 |
20150287854 | METHOD OF FABRICATING A(C)IGS BASED THIN FILM USING Se-Ag2Se CORE-SHELL NANOPARTICLES, A(C)IGS BASED THIN FILM FABRICATED BY THE SAME, AND TANDEM SOLAR CELLS INCLUDING THE A(C)IGS BASED THIN FILM - A method of fabricating an Ag—(Cu—)In—Ga—Se (A(C)IGS) based thin film using Se—Ag | 10-08-2015 |
20150287868 | ULTRA THIN HIT SOLAR CELL AND FABRICATING METHOD OF THE SAME - Disclosed is an ultra-thin HIT solar cell, including: an n- or p-type crystalline silicon substrate; an amorphous silicon emitter layer having a doping type different from that of the silicon substrate; and an intrinsic amorphous silicon passivation layer formed between the crystalline silicon substrate and the amorphous silicon emitter layer, wherein the HIT solar cell further includes a transparent conductive oxide layer made of ZnO on an upper surface thereof, and the surface of the crystalline silicon substrate is not textured but only the surface of the transparent conductive oxide layer is textured, and thereby a very thin crystalline silicon substrate can be used, ultimately achieving an ultra-thin HIT solar cell having a very low total thickness while maintaining light trapping capacity. | 10-08-2015 |
Patent application number | Description | Published |
20130147355 | DETECTING CIRCUIT FOR OPEN OF LED ARRAY AND LED DRIVER APPARATUS USING THE SAME - A detecting circuit and method thereof are configured to detect whether an LED array is open is described. The detecting circuit includes a resistance unit, a first switching unit, and an output unit. The resistance unit is operatively connected in series to the LED array. The switching unit is configured to be turned on when a voltage of the resistance unit is greater than or equal to a predetermined voltage level. The output unit is configured to produce an output indicative of whether the LED array is open, based whether the first switching unit is turned on. | 06-13-2013 |
20130147361 | DETECTING CIRCUIT FOR SHORT OF LED ARRAY AND LED DRIVING APPARATUS USING THE SAME - A detection circuit configured to detect a short in a plurality of LED arrays is provided. The detection circuit includes a voltage measuring unit, a short detecting unit, and a detection control unit. The voltage measuring unit is configured to measure respective feedback voltages of the plurality of LED arrays and output a lowest measured feedback voltage as a first feedback voltage. The short detecting unit is configured to detect the short in the LED arrays using the measured feedback voltages. The detection control unit is configured to control the short detecting unit to stop short detection operation, when the first feedback voltage exceeds a first preset reference voltage. | 06-13-2013 |
20140347030 | RAMP CIRCUIT AND DIRECT CURRENT (DC)- DC CONVERTER THEREOF - Provided are a ramp circuit and a DC-DC converter. The ramp circuit generates a current flowing in a resistor using voltages affected by an output voltage and an input voltage of a DC-DC converter, and generates a ramp signal through copying of the current and charging and discharging of a capacitor using a current mirror unit. The ramp signal is generated by considering the input voltage and the output voltage, and thus the ramp signal has an optimal slope to provide an adaptive response to state change in the input voltage and the output voltage. The DC-DC converter uses such a ramp circuit to facilitate its operation. | 11-27-2014 |
20150054482 | CURRENT CONTROLLING MODE DIRECT CURRENT (DC)-DC CONVERTER - There is provided a current controlling mode DC-DC converter that operates in a PWM mode or a PFM mode by adjusting a turned-on time of a gate depending on power consumption of a load. The DC-DC converter includes a first comparator that receives a first input voltage and a second input voltage and outputs a first output signal, a second comparator that receives a reference voltage for mode switching and the second input voltage and outputs a second output signal, and a first logic element that outputs a reset signal for turning off a gate at a point of time when both the first output signal and the second output signal are applied. Examples may also include additional elements to facilitate mode switching. | 02-26-2015 |
20150268690 | CIRCUIT FOR COMPENSATING BIPOLAR JUNCTION TRANSISTOR BASE CURRENT AND LED DRIVING APPARATUS HAVING THE SAME - Disclosed is a circuit for compensating a bipolar junction transistor (BJT) base current that mirrors the BJT base current to induce a mirror current that is coupled to an emitter of the BJT to decrease an emitter current by a size of the mirror current. Also disclosed is a light-emitting diode (LED) driving apparatus including an LED array, a BJT series-coupled to the LED array, a measuring unit coupled to an emitter of the BJT to measure a current flowing into the LED array, a differential amplifier configured to differentially amplify a reference voltage and the measured current to supply a base current to a base of the BJT, and a BJT base current compensation circuit as disclosed to accurately control an LED current. | 09-24-2015 |