Title :
Compact backup power supply using intermittent charging for an optical network unit in FTTH systems
Author :
Takeno, Kazuhiko ; Yamasaki, Mikio ; Suzuki, Toru ; Muroyama, Seiichi ; Tsuamoto, K.
Author_Institution :
Integrated Inf. & Energy Syst. Lab., NTT, Tokyo, Japan
Abstract :
An ONU (optical network unit) backup power supply has been developed that uses intermittent charging circuitry and high-energy-density Ni-MH (nickel metal-hydride) batteries. The intermittent charging is controlled based on the open-circuit voltage, which has a strong relationship with the battery charge near the fully charged condition. This charging method uses simple circuitry, its operation was confirmed by charge testing. A power supply using this circuit and Ni-MH batteries is about 45% smaller than one using conventional charging circuitry and Ni-Cd (nickel-cadmium) batteries
Keywords :
battery chargers; optical fibre subscriber loops; secondary cells; telecommunication power supplies; uninterruptible power supplies; FTTH systems; Ni-MH secondary batteries; charge testing; charging circuitry; compact backup power supply; intermittent battery charging method; open-circuit voltage; optical network unit; Analog-digital conversion; Batteries; Circuits; DC-DC power converters; Emergency power supplies; Intelligent networks; Optical fiber subscriber loops; Optical network units; Telephony; Uninterruptible power systems;
Conference_Titel :
Telecommunications Energy Conference, 1997. INTELEC 97., 19th International
Conference_Location :
Melbourne, Vic.
Print_ISBN :
0-7803-3996-7
DOI :
10.1109/INTLEC.1997.645867
