Korea Electric Power Corporation

Samsung Heavy Ind. Co., Ltd

Halla Visteon Climate Control Corporation

Soon Ho Choi

Hyun Sup Yang

Cha You Lim

Chan Ki Kim

Kyung Seok Cho

Seong Doo Lee

Se Myun Oh

Seong Sun Rhyu

Hee Sang Cho

An HVDC power increase controller includes a command output unit for outputting a current command value according to a disturbance signal to a main controller; a voltage drop determiner receiving an alternating current (AC) voltage and comparing a level of the AC voltage to a lowest level of a voltage causing a rectification failure; and a power tracking determiner receiving a direct current (DC) power and comparing a level of the DC power to an estimated power level corresponding to the current command value. The command output unit adjusts the current command value according to a comparison result of the voltage drop determiner and the power tracking determiner.

HVDC rectifier protection using estimated and measured power

Provided is an air blower for a fuel cell vehicle, and in particular, an air blower for a fuel cell vehicle having a cooling water passage formed in a motor case and an air flowing groove to increase cooling efficiency and reduce a shaft load to improve durability.

Air blower for a fuel cell vehicle

A contra-rotating propeller system is installed between a rudder horn of a ship and shaft support at an engine-output side. The system includes a propeller shaft rotatably supported by the rudder horn and the shaft support, respectively, a front propeller fixed to the propeller shaft, a counter rotating gear set installed on the rudder horn and connected with the propeller shaft, and a rear propeller connected to the counter rotating gear set and disposed between the rudder horn and the front propeller.

Contra-rotating propeller supported on rudder horn of ship

Growing community of inventors

Daejeon, South Korea

Soon Ho Choi