Highly reliable power-supply system for fiber-optic subscriber network systems

摘要: NTT (Japan) has developed a highly reliable, small, high-efficiency and high-power-factor power supply system for fiber-optic subscriber network systems. The is composed of rectifier block, ringer common circuit other components. Every block implemented as PWB (printed wiring board) package removable from the subrack easy maintenance. stage flyback converter that uses magnetic switch to correct factor convert 100 V AC regulated 48 DC in only one stage. Furthermore, can control battery charge voltage when temperature varies it evaluate capacity. efficiency 90.8% at full load 0.97. volume 60% conventional supply.