Research Of Emergency Power Supply For Coal Mine Safety Monitoring System

At present, coal mine basically installed safety production monitoring systems andpersonnel location system in China. It has played a positive role for safety and efficientproduction of coal mine.But coal mine will cause a series of blackouts when a power failure ormine accident. The safety production monitoring systems and personnel location system cannotprovide reliable information for a long time because the self-provided power supply time islimited.The main monitoring signal is unavailable such as various gas concentrations, windspeed, negative pressure, the main ventilator and partial ventilator start/stop, air funnel state etc.These factors hinder rescue, delay rescue time to increase casualties.Improve the power supplyreliability of safety production monitoring systems and personnel location system is an importantmeasure to ensure the safety of personnel and the efficient production of coal mine.This subject is an Emergency Power Supply designed for the Center station of safetymonitoring system.When the AC power outage, emergency power must guarantee the centralstation work for more than two hours, and the AC power supply must meetAC220V/1000VA.The system uses a serial battery of LFP as energy reserves of EPS. Theemergency power supply switched without delay when the power grid outage. The battery DCconvert stable220V AC-voltage by single-phase full-bridge inverter to ensure uninterruptedpower supply of the safety monitoring system. This thesis main content include all parts of theEPS and thoroughly studied battery DC to AC conversion as a core component by inverter.Firstly, the subject introduced system configuration and overall design of EPS as well asfunction of each component. Then the hardware of inverter design is sets forth at length. Theinverter adopts single-phase full bridge topology and SPWM technique. The inverter voltage iscontrolled by incremental PI arithmetic. IGBT driver circuit uses the integration moduletype.Secondly, based on the research of the battery charging mode and battery managementsystem studied battery charging mode and the structural form of lithium iron phosphate,elaborated the charge control system solutions and specific hardware implementation. Designingbattery management system based on MAX11068, C8051F340. In the next, the concretehardware design of EPS is presented, based on TMS32OLF24O7, which fits to realize the outputvoltage controlled inverter. Subsequently, the thesis provides a brief software design of DSP.Finally, a summary of the overall research analyzes deficiencies, proposes better improvementprogram.