Abnormal Phenomenon of Output-Voltage Increase and Its Solution in a Parallel-Redundant DC-DC Converter System with Current Sharing Control

Conference: Intelec '05 - Telecommunications Conference - 27th International Telecommunication Energy Conference
09/18/2005 - 09/22/2005 at Berlin, Germany

Proceedings: Intelec '05 - Telecommunications Conference

Pages: 6Language: englishTyp: PDF

Personal VDE Members are entitled to a 10% discount on this title

Shimamori, Hiroshi; Itakura, Kazuhiko (Enterprise Server Division Fujitsu Limited, Kanagawa 211-8588, Japan)
Yamashita, Shigeharu (Powertro System Division Fujitsu Access Limited, Kanagawa 213-8586, Japan)
Kohama, Teruhiko (Dept. of Electrical Engineering Fukuoka Univercity, Fukuoka 814-0180, Japan)
Ninomiya, Tamotsu (Dept. of EESE Kyushu University, Fukuoka 812-8581, Japan)

Abnormal phenomenon of output voltage is observed in a paralleled N+1 redundant DC-DC converter (DDC) system. The phenomenon is caused by a current sharing control under the condition of periodic load change, resulting in output-voltage increase. The mechanism of the phenomenon is analyzed with a circuit simulator and confirmed by experiment. A new type of current sharing circuit is proposed to solve the problem.