A telecommunications power system according to the invention includes a power bus and a plurality of batteries that are connected to the power bus. A distribution module is connected to the power bus. A plurality of loads are connected to the distribution module. A plurality of rectifier modules are...http://www.google.com.hk/patents/US6281602?utm_source=gb-gplus-share專利 US6281602 - Backup battery recharge controller for a telecommunications power system
