Lg Electronics Inc.

Postech Academy-industry Foundation

Lg Display Co., Ltd.

Bong Koo Kang

Sang Jin Yoon

Eung Chul Park

Jung Gwan Han

Kyung Min Lee

Young Hwan Kim

Yun Kwon Jung

Sang Jin Yun

Yoo Chae Chung

Chang Hyeon Sung

Nam Kyu Lee

Ju Won Seo

Seong Ho Kang

Young Joon Ahn

Moon Shick Chung

Jong Ho Lim

Hee Chan Yang

Bon Cheol Koo

Joong Kyun Kim

Young Kyu Park

Gop Sick Kim

Young-Bok Song

Kyu Bong Jung

Min Gi Cho

Sang Won Lee

Sang Yoon Soh

Hyung Jin Choe

Yoon Geol Choi

Sung Wook Jung

Ho Young Yoon

Jung Gwau Han

Byeong Cheol Kim

Seok Ho c/o Phang Univ Of Science & Tech Kim

Yun Kwon c/o Poonglim 2-Cha Apt205-405 Jung

Seok Ho Paust labPDP Group Pohang Univof Kim

The present invention relates to a technique for implementing a bidirectional DC-DC converter applied to an energy storage system. The bidirectional DC-DC converter includes a magnetically coupled inductor and a charging/discharging voltage storage unit between a DC link power supply and a battery power supply, and implements a high gain through a two-step voltage transformation process when a charging process or discharging process is performed. Thus, the bidirectional DC-DC converter can reduce the construction cost of the battery cell, guarantee a high voltage available range, and reduce the influence of leakage inductance.

Bidirectional DC-DC converter

The present invention relates to a method for more efficiently performing a balancing operation for a plurality of battery cells of which charges are not equal, in a battery cell balancing circuit using an LC series resonant circuit. The method may include calculating balancing charge for all battery cells of which the charges are not equal, selecting the strongest battery cell storing the highest charge and the weakest battery cell corresponding to the strongest battery cell, among the entire battery cells, and performing a series of balancing operations.

Battery cell balancing method

The present invention relates to a technology capable of improving the use time of a battery cell by generally or individually controlling charge or discharge with respect to a multi-battery cell by using LC serial resonance in a module with a multi-battery cell structure. To this end, the present invention includes a battery module including a plurality of serially connected battery cells, a serial resonant circuit including serially connected inductor and capacitor and performing a serial resonant function, and first to third switch units that set an electric energy collection path and an electric energy supply path between the battery module and the serial resonant circuit.

Battery cell balancing circuit using LC serial resonance

Provided is a battery cell balancing circuit including: a battery cell module including a plurality of battery cells connected in series; a series resonant circuit including an inductor unit and a capacitor unit which are connected in series so as to store electric energy recovered from a corresponding battery cell of the battery cell module and supply the stored electric energy to a corresponding battery cell of the battery cell module; and a switch unit configured to provide an electric energy recovery path for storing the electric energy recovered from the corresponding battery cell of the battery cell module into the capacitor unit of the series resonant circuit and provide an electric energy supply path for supplying the stored electric energy to the corresponding battery cell of the battery cell module.

Balancing control circuit for battery cell module using LC series resonant circuit

A backlight unit, with a parallel configuration of plural lamps, having improved reliability is disclosed. The backlight unit driver includes: first and second lamps connected parallel to each other; a DC/AC inversion portion inverting a DC voltage into an AC voltage to apply the AC voltage to the lamps; a transformer transforming the AC voltage from the DC/AC inversion portion; a positive polarity AC signal compensator compensating an electric current difference between the first and second lamps using positive polarity AC signals from the first and second lamps; and a negative polarity AC signal compensator compensating the electric current difference between the first and second lamps using negative polarity AC signals from the first and second lamps.

Driver for backlight unit

The present invention relates to a method and apparatus for driving a plasma display panel that can be driven at a low voltage and prevent undesired discharge from being generated under high temperature environment.

Method and apparatus for driving plasma display panel

An energy recovery circuit is provided that includes: a panel capacitor formed equivalently in a scan electrode and a sustain electrode, a scan electrode driver installed at a side of the scan electrode of the panel capacitor to supply a sustaining pulse to the side of the scan electrode, and a sustain electrode driver installed at a side of the sustain electrode of the panel capacitor to supply the sustaining pulse to the side of the sustain electrode. The energy recovery circuit may further include a first diode coupled to the scan electrode side of the panel capacitor, a second diode coupled to the sustain electrode side of the panel capacitor, a first inductor commonly coupled to the sustain electrode side and the scan electrode side of the panel capacitor, a path providing part coupled to the first inductor, and a single source capacitor connected to the path providing part.

Energy recovery circuit and energy recovering method using the same

The present invention relates to a method and apparatus for driving a plasma display panel that can be driven at a low voltage and prevent undesired discharge from being generated under high temperature environment. A method and apparatus for driving a plasma display panel according to an embodiment of the present invention includes a first step of applying an initialization signal to the first and second electrodes to initialize cells, the initialization signal has at least one rising part where a voltage rises and at least one sustain part where the voltage is sustained; a second step of applying a scan signal to any one of the first and second electrodes, and data to the third electrode to select the cell; and a third step of alternately applying sustain signals to the first and second electrodes to carry out a display for the selected cell.

A method of driving a plasma display panel wherein a selective inversion system is used to perform an address operation. In the method, a reset step makes an entire write discharge of the cells to form wall charges. An address step makes an address discharge of specific cells of the cells undergoing said entire write discharge to invert the polarities of the wall charges of said specific cells and to keep the polarities of the wall charges according to said entire write discharge as they are at the remaining cells excluding said specific cells. A sustain step makes a sustain discharge of only the specific cells having the inverted wall charge polarity by a sustain pulse. Accordingly, a data is written by the selective inversion addressing method to permit a high-speed driving and to prevent a contrast deterioration.

Method of driving plasma display panel using selective inversion address method

A method may be provided for setting an average picture level. This may include setting an average picture level with a fixed number of steps based on a pre-determined gray level range, deriving a low brightness intensifying coefficient, deriving a high brightness intensifying coefficient, deriving a first constant representing an average increase rate of brightness, and calculating a number of sustain pulses corresponding to a gray level of a video signal currently inputted based on the derived low brightness intensifying coefficient, the derived high brightness intensifying coefficient and the derived first constant.

Setting method for average picture level and method of driving plasma display panel using the same

A plasma display panel configuration helps to prevent unwanted discharge generation in cells adjacent to excited discharge cells and to improve picture quality of the plasma display panel. An exemplary embodiment of the present invention includes barrier ribs for partitioning off discharge cells, wherein edge parts of the cross sectional shape of the barrier ribs are lower than central parts of the cross sectional shape of the barrier ribs and can have a number of distinctive shapes.

Plasma display panel

A plasma display panel that is adapted to be driven with a low-level voltage signal. A source electrode is supplied with a voltage and a trigger electrodes is opposed to the source electrode. A first discharge is generated between each source electrode and each trigger electrode to apply a voltage at source electrode to a panel electrode.

Low voltage driving apparatus and method for plasma display panel

Growing community of inventors

Pohang-shi, South Korea

Bong Koo Kang