The Research Of EPS Emergency Power Supply System

With the continuous progress of the era, the society has taken on more and more modernization. At the same time, the focus of people's fire protection is increasing with it. hi recent years, EPS power supply system is widely used in fire fighting and emergent lighting cases because of its predominant performance and good environment protection, compared with EPS, UPS has the capability of providing uninterruptible power for loads, furthermore, to get high quality power of output voltage, it has to deal with the input power, such as stabilizing voltage, filtering ripple, etc. It usually applies to the power provision of precise apparatus like computer, communication equipment and network equipment, etc. as a result, the cost of UPS is higher relatively. While EPS need not stabilize the input power, usually being fit for the loads which do not require high quality power, when the input power is abnormal, it can be used as emergency power. Generally, the requirement of EPS's reliability is high and the cost is low comparatively.This paper studies the operating principle and basic components of EPS system as following points:1. According to the request of a given application case, the implement projects of inverting, charging and switching are given in this paper.2. To improve the adaption capability to all kinds of loads, the factors of affecting system's performance and reliability, including the compensation of dead time, the mode of switching controlling, the controlling method of inverter, etc, are studied, furthermore, the control modes of large starting current loads are researched under the rated voltage and the settlement projects are given accordingly.3. To guarantee realiability, We design a kind of battery checking unit in this system. In addition, to eliminate the bad effects of harmonic current which are caused by the charger, a charger with PFC function is designed for battery in this paper.4. A liquid display subsystem with the function of keyboard operating is presented in the paper and the user can monitor the system's states through it conveniently.