Control Scheme of Emergency Power Supply for Elevator Emergency Call System

승강기의 비상 통화장치용 비상 전원장치의 충·방전 제어회로

Park, Noh-Sik;Lee, Dong-Hee

  • Received : 2015.05.15
  • Accepted : 2015.07.15
  • Published : 2015.08.31


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.


Emergency Power Supply;Emergency Call;Battery Charger;SOC Monitoring


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