Design Of Online Monitoring Equipment For Vrla Battery Based On MSP430

In recent years, VRLA battery is widely used in various fields of communications,hospitals, railway, electricity as mothball power supply. when the utility power failurehappened, VRLA Battery is the only Provider to load, so the battery’s performance andworking state is essential to the security and stability of the power supply system.however, VRLA battery become invalid frequently and cause equipments halt, seriousaccidents, because of overcharge, over-discharge, resistance increases andover-temperature, so battery performance real-time monitor is extremely necessary.The author designed the lead-acid batteries online monitoring system for type of48V/10Ah,which based on the principles of electrical characteristics and working processof lead-acid batteries, and proposing the four-terminal method(add1kHz AC signal tobattery)to measure internal resistance, Ah integration method to estimate SOC, andmonitor the operating parameters, including voltage, current, temperature. The systemconsists of hardware design and software design, the hardware part includes the followingmodules: control module, voltage, current, temperature internal resistance measurementmodule, communication, storage module, status indication alarm module, and the controlmodule takes MSP430F149as microcontroller, finished reading, writing, controllingoperations, using intelligent battery management chip DS2438to monitor parameters likecurrent, voltage temperature and SOC, the data could exchange between MCU andpersonal computer by RS-232bus, status alarm module could indicate the working stateand buzzer during the phenomenon have shown overcharge, over-discharge, abnormaltemperature, battery failure.The standard IED (Integrated Development Environment) of MSP430seriesmicrocontroller is IAR Embedded Workbench, the program is downloaded toMSP430F149Flash memory by JTAG interface, and then complied and simulated throughIAR C-SPY debugger, each measurement subroutine will be executed when an interruptservice generated, system’s each hardware function module, at last, the testing resultshows that VRLA monitor had reached technology parameters.