1
Eun Soo Kim, Kee Yeon Joe, Moon Ho Kye: Circulating current free type high frequency soft switching pulsewidth modulated full bridge DC/DC converter. Korea Electrotechnology Research Institute, Flynn Thiel Boutell & Tanis P C, August 31, 1999: US05946200 (55 worldwide citation)

An improved soft switching topology of a full bridge PWM DC/DC converter is described. The new topology employs an energy recovery snubber to minimize a circulating current flowing through the transformer and switching devices. By using an energy recovery snubber instead of adding a tapped inductor ...


2
Ju Won Baek, Jung Goo Cho, Geun Hie Rim, Eun Soo Kim: Passive ripple filter for zero voltage-zero current switched full-bridge DC/DC converters. Korea Electrotechnology Research Institute, Nikaido Marmelstein Murray & Oram, March 23, 1999: US05886884 (34 worldwide citation)

The present invention is a circuit for zero voltage-zero current switching in a full-bridge DC-DC converter including a transformer for inducing the current and the voltage onto the secondary side by the switching operation of switches configured as full bridge; a full-bridge rectifier by which curr ...


3
Do Hyun Kang, Jung Hwan Chang, Ji Young Lee, Ji Won Kim, Shi Uk Chung: Inner rotor type permanent magnet excited transverse flux motor. Korea Electrotechnology Research Institute, Frommer Lawerence & Haug, Ronald R Santucci, May 31, 2011: US07952252 (26 worldwide citation)

Disclosed herein is an inner rotor type permanent magnet excited transverse flux motor, in which a laminated structure in an axial direction or in a radial shape is applied to a stator iron core so as to employ a small amount of permanent magnets compared with a conventional outer rotor type permane ...


4
Jung Woo Park, Ki Wook Lee, Dong Wook Kim: Electric power converting device and power converting method for controlling doubly-fed induction generator. Korea Electrotechnology Research Institute, Frommer Lawrence & Haug, Ronald R Santucci, August 25, 2009: US07579702 (24 worldwide citation)

Disclosed herein is an electric power converting device and power converting method for controlling doubly-fed induction generators, which provides a synchronous generator for generating auxiliary electric power independently of a doubly-fed induction generator so as to generate electricity even in ...


5
Do Hyun Kang, Jung Hwan Chang, Ji Won Kim: Permanent magnet excited transverse flux motor with outer rotor. Korea Electrotechnology Research Institute, Frommer Lawrence & Haug, Ronald R Santucci, December 1, 2009: US07626308 (19 worldwide citation)

Disclosed herein is a permanent magnet-excited transverse flux motor with an outer rotor. The permanent magnet-excited transverse flux motor comprises: a stator including a stator powdered iron core formed by an extruded molding through a mold, a pair of stator laminated iron cores stacked respectiv ...


6
Taek Soo Kim, Myong Soo Park, Yong Joo Kim, Jin Bong Kim, Don Ha Hwang: Method of detecting partial discharge using frequency spectrum analyzer. Korea Electrotechnology Research Institute, Korea Electric Power Corporation, Michael D Kilpatrick Stockton Bednarek, June 24, 1997: US05642038 (16 worldwide citation)

A method of detecting a partial discharge signals occurring at an insulator, using a Frequency Spectrum Analyzer (FSA) with a monitor screen. The method including the steps of setting a horizontal axis of the monitor screen as a time axis and a vertical axis as an axis representing a voltage magnitu ...


7
Do Hyun Kang, Jeong Woo Jeon: Transverse flux linear motor with permanent magnet excitation. Korea Electrotechnology Research Institute, Piper Rudnick, February 1, 2005: US06849969 (14 worldwide citation)

A transverse flux linear motor with permanent magnet excitation having a stator including stator cores and windings respectively wound around the stator cores and supplied with current, and a mover arranged at a central portion of the stator, the mover including mover cores and permanent magnets. Ea ...


8
Do Hyun Kang, Yeong Han Chun, Jeong Woo Jeon: Integrated system of a permanent magnet excited motor and a non-contact power feeding apparatus. Korea Electrotechnology Research Institute, Rothwell Figg Ernst & Manbeck, June 17, 2003: US06580185 (12 worldwide citation)

The present invention relates to an integrated system in which a bilateral permanent magnet excited synchronous motor part and a non-contact power feeding part are combined in order to generate a linear driving force and to feed an electric power without any contact. The present integrated system co ...


9
Do Hyun Kang, Jong Moo Kim: Horizontal and vertical transportation system using permanent magnet excited transverse flux linear motors. Korea Electrotechnology Research Institute, Rothwell Figg Ernst & Manbeck P C, January 23, 2007: US07166938 (11 worldwide citation)

Disclosed herein is a horizontal and vertical transportation system using permanent magnet excited transverse flux linear motors which is capable of linearly transporting an object in the horizontal direction and in the vertical direction using permanent magnet excited transverse flux linear motors, ...


10
Ju Won Baek, Dong Wook Yoo: Passive auxiliary circuit for series connection of a power switch. Korea Electrotechnology Research Institute, Arent Fox Kintner Plotkin & Kahn PLLC, November 20, 2001: US06320362 (10 worldwide citation)

The present invention relates to a passive auxiliary circuit for driving power switches connected in series for much higher rating of a power system. The passive auxiliary circuit for an IGBT power switch connected in series with another, comprises two capacitors, which are connected in series acros ...