Research And Design On The Battery Monitoring System And Filter

With the development of technology process, the consideration of the energy andenvironment and sustainable development requirements, the new lithium-ion batterysystem are widely used in automotive electronics as one of the signs of energy savingand environmental protection. Also it’s an important condition for the automotivemarket from hybrid cars to all-electric vehicle development. Currently, the mainfactors affecting the promotion and application of electric vehicles are the safety andcost of battery power. Therefore, extending the battery life is one of the effectiveways to reduce the cost. Developed battery management system is an important basisto improve the battery power level, as an important part of the battery system,shoulder the important responsibilities of optimize battery use and extend battery life.Under the basis of the study and summarize of foreign advanced batterymanagement system. In this paper, the lithium battery management system designideas and structures and filter circuits was made to get certain improvements. Firstly,based on multi-channel to single-channel sampling timing control system powermanagement, using top-down design process, design and analysis detail of themanagement system, multiplexer, temperature control, incremental sigma-delta ADCand SPI bus timing control circuit and to optimize the design. Then, in order toimprove the accuracy and enhance the robustness of the ADC suppression frequencyof line frequency, rotation of the zero-based algorithm is used to optimize the filtercircuit. In order to better accommodate the uncertainty of the on-chip oscillator, byoptimizing the comb filter stop-band near zero, to solve the effect of suppressing theon-chip oscillator frequency degradation due to inaccurate questions derivedhigh-resolution data. Finally, after the optimized timing control system simulation,logic synthesis, place and route, timing analysis, and then tape-out.By optimize the timing control circuit and combining the analog part, thesampling system can be realized, and the battery voltage and the digital conversionoutput correctly. Multi-channel to single-channel sampling methods to control thetiming is optimized to achieve extended battery multi-section. In order to betteraccommodate the uncertainty of the on-chip oscillator, by optimizing the comb filterstop-band near zero, solve the problem of reducing the effect of suppressing the on-chip oscillator frequency inaccuracy, the design improve the robustness of thefilter to meet the demand better.