| Title |
Control Scheme of Emergency Power Supply for Elevator Emergency Call System |
| Authors |
Noh-Sik Park ; Dong-Hee Lee |
| DOI |
http://dx.doi.org/10.5207/JIEIE.2015.29.8.040 |
| Keywords |
Emergency Power Supply ; Emergency Call ; Battery Charger ; SOC Monitoring |
| Abstract |
In this paper, battery charging and discharging circuit with a single voltage power supply is proposed. The proposed circuit has the separated current path and charging-monitoring sequence control scheme. In the charging sequence, the proposed 2-level comparator combined with control signal of the micro-processor can control the constant charging current to protect the over current of the battery. Furthermore, the proposed circuit uses a periodic main power switch control to detect the discharging characteristics to estimate the approximated battery life-time. In the experiments, the proposed emergency power supply for emergency call system has 89% efficiency with 98% power factor. And the proposed sequence control scheme is well operated in the designed emergency power system. |