Lg Electronics Inc.

Yonsei University

Korea Electrotechnology Research Institute

Jungwook Park

Kyoungsoo Moon

Woosuk Ko

Sungryong Hong

Sejin Oh

Seungryul Yang

Seungjoo An

Jinwon Lee

Soohyoung Lee

Hyoungkyu Yang

Minsung Kwak

Jangwon Lee

Woosuk Kwon

Jinpil Kim

Younghwan Kwon

Donghyun Kang

Huisang Yoo

Jongsung Choi

Hyekyeong Yeom

Issac Kim

Kyeongtae Kim

Steve Winston

Sunho Lee

Seonah Lee

Yongcheol Kang

The present disclosure relates to a multi-functional multi-ratio OBC/LDC integrated circuit that is capable of bidirectional operation over a broad voltage rage with a high power density and without additional control in a battery charging system for an electric vehicle. As the turns ratio can be used selectively, the G2V and V2G functions can be performed bidirectionally over a broad voltage range without additional control, and the LDC function can be operated by using only a small number of switches, so that the efficiency of the charging control can be increased.

Multi-functional multi-ratio OBC/LDC integrated circuit

Disclosed is an apparatus including: a photovoltaic panel; a CPG controller configured to receive a limit output power value of a photovoltaic panel, a photovoltaic panel terminal voltage, and a photovoltaic panel output current and output a photovoltaic panel terminal voltage reference; a direct current (DC)-voltage controller configured to receive the photovoltaic panel terminal voltage reference and the photovoltaic panel terminal voltage and output a duty ratio to cause an error between these values to become zero; a pulse width modulation (PWM) control signal generator configured to receive the duty ratio and output a PWM signal to control a DC/DC converter connected to the photovoltaic panel; the DC/DC converter configured to receive the PWM signals and perform CPG control; and a DC/AC inverter connected to the DC/DC converter and configured to convert DC power into AC power and output the AC power to an electrical grid.

System and method for controlling constant power generation of photovoltaic system

Disclosed is an apparatus and method for controlling maximum power point tracking (MPPT) of a photovoltaic system using active power control. The apparatus includes a photovoltaic panel, a photovoltaic inverter unit which converts direct current (DC) power received from the photovoltaic panel into alternating current (AC) power and outputs the AC power used as commercial power, and an active power-based inverter control unit which determines a reference value (P) for output power (P) of a photovoltaic inverter using a curve (P) connecting maximum power points according to a change in solar irradiance in a P-V curve showing a relationship between photovoltaic output power and a terminal voltage and measures a terminal voltage (V) of the photovoltaic panel to allow the photovoltaic inverter to perform an operation according to MPPT control for tracking a value of the terminal voltage changed according to the solar irradiance.

Apparatus and method for controlling MPPT of photovoltaic system using active power control

An inverter-based stand-alone microgrid control system using a time synchronization-based measurement unit, in which a converter controller configured to control a converter that determines a voltage and a phase of a point where a plurality of distributed power supply devices is interconnected. The system includes a time correction unit configured to provide a time corrected on the basis of time information received from a GPS; a signal comparison/generation unit configured to compare a sine wave generated according to a voltage magnitude and a phase reference signal with a harmonic carrier signal on the basis of the time provided by the time correction unit, and generate a PWM signal; and a switch operation control unit configured to apply the PWM signal from the signal comparison/generation unit to the converter, and operate a switch.

Inverter-based stand-alone microgrid control system using time synchronization-based measurement unit

Disclosed is an apparatus and method for controlling an asymmetric modular multilevel converter which allow numerous levels to be expressed according to a combination of modules each using a different voltage, comprising: an asymmetric arm configured with a full bridge and a half bridge; and a control method of controlling each capacitor level of the full bridges and capacitor level of the remaining half bridges to be different from one another by a full bridge structure, wherein each module configuring the asymmetric arm uses a different voltage and an output voltage is expressed by a combination thereof.

Apparatus and method for controlling asymmetric modular multilevel converter

An apparatus for processing a hybrid broadcast service, the apparatus comprising a reception module for receiving broadcast signals though a broadcast channel or contents through a broadband channel for the hybrid broadcast service, wherein the broadcast signals include data for the hybrid broadcast service and an EAM (Emergency Alert message) and a processor for receiving a request from a companion device and sending at least one of a content or continuous components or files or data or media timeline information of the EAM (Emergency Alert message) based on the request, wherein the continuous components or the files or the data are a part of the hybrid broadcast service which is currently selected.

Broadcast receiving device and operating method thereof

An apparatus for transmitting broadcast signals, an apparatus for receiving broadcast signals, a method for transmitting broadcast signals, and a method for receiving broadcast signals are disclosed. A method for transmitting a broadcast signal includes: dividing the media data into a plurality of media data fractions; generating file formats including each of the media data fractions, wherein the generated file formats include a first file format and second file formats, wherein the first file format includes metadata of the entire media data for processing the media data fractions in the second file formats, wherein each of the second file formats include metadata of the media data fractions in the each of the second file formats; and transmitting the generated first and second file formats.

Apparatus for transmitting media data via streaming service, apparatus for receiving media data via streaming service, method for transmitting media data via streaming service and method for receiving media data via streaming service

A method of operating a video display device including a display unit is provided. The method includes: playing uncompressed audio-visual content through a first layer of the display unit; obtaining content information on the uncompressed audio-visual content based on some of the uncompressed audio-visual content; obtaining an enhanced service based on the content information; and playing an obtained enhanced service through a second layer of the display unit, wherein the first layer and the second layer are overlapped each other.

Video display device and method of controlling the device

Disclosed are a signal transmitting method, a signal transmitting apparatus, and a system for transmitting and receiving a signal. The signal transmitting method comprises the steps of: discovering a companion device using a multicast mode; receiving and storing device type information from the discovered companion device; receiving an application uniform resource identifier (URI) and storing the application URI to correspond to the device type information; and identifying the device type information of the companion device selected by a user and transmitting to the selected companion device the application URI corresponding to the device type information.

Signal transmitting apparatus, signal transmitting method, and system for transmitting and receiving signal

Packaging box for mobile phone

Growing community of inventors

Seoul, South Korea

Jungwook Park