Title :
Highly reliable power-supply system for fiber-optic subscriber network systems
Author :
Yamashita, Takashi ; Sasaki, Kouei ; Kobayashi, Koichi ; Matsumoto, Kenji
Author_Institution :
NTT Network Syst. Dev. Dept., Chiba, Japan
Abstract :
NTT (Japan) has developed a highly reliable, small, high-efficiency and high-power-factor power supply system for fiber-optic subscriber network systems. The power supply system is composed of a rectifier block, a ringer block, a common circuit block, and other components. Every block is implemented as a PWB (printed wiring board) package and is removable from the power subrack for easy maintenance. The power stage of the rectifier is a flyback power converter that uses a magnetic switch to correct the power factor and convert from 100 V AC to regulated 48 V DC in only one stage. Furthermore, the system can control battery charge voltage when temperature varies and it can evaluate battery capacity. The efficiency of the rectifier is 90.8% at full load and the power factor is 0.97. The volume of the power supply is 60% of the conventional power supply
Keywords :
AC-DC power convertors; battery chargers; magnetic switching; optical fibre subscriber loops; power system reliability; rectifying circuits; secondary cells; telecommunication power supplies; 100 V; 48 V; 90.8 percent; battery capacity; battery charge voltage; common circuit block; fiber-optic subscriber network; flyback power converter; magnetic switch; power factor corrector; power reliability; power stage; power supply system; printed wiring board; rectifier block; ringer block; Batteries; Circuits; Packaging; Power supplies; Power system reliability; Reactive power; Rectifiers; Switches; Telecommunication network reliability; Wiring;
Conference_Titel :
Telecommunications Energy Conference, 1996. INTELEC '96., 18th International
Conference_Location :
Boston, MA
Print_ISBN :
0-7803-3507-4
DOI :
10.1109/INTLEC.1996.573349
