Design And Implementation Of Aviation Battery Charge And Discharge System Based On DSP

Aviation battery which is used for giving power to critical load of aircraft in emergency is an important part of the aircraft airborne equipment, to ensure that the aircraft can land safety. Battery charging and discharging system affects the performance and service life of storage battery directly,research on charge and discharge system of aviation battery has become a hot subject with the rapid development of the aerospace in recent years.Traditional aviation battery charge and discharge devices often use a simple constant current or constant voltage mode without function of real-time monitoring process of charge and discharge state that can easily result in overcharge and irreversible damage for battery. To overcome these shortcomings, this subject designs aviation battery charge discharge system based on DSP, which can monitor battery status in real-time to charge and discharge intelligently on the basis of status of battery with using integrated digital control technology ofinodern power electronics, high frequency inverter and timely discharge depolarization according to small size and high charge-discharge efficiency these special requirements for aviation battery charge and discharge device.This paper chose TMS320F28335 as the core control chip of TI company to realize digital control. Design of the peripheral circuit chip was completed at first, initializating various modules then, including: DSP minimum system, universal input output module,the peripheral interrupt expansion module, enhance the capture module, AD conversion module, EPWM module, and man-machine interface module.Design of the system external hardware circuit which includs the charge circuit,discharge circuit, protection circuit, control circuit and feedback circuit was completed on the basis of the above design. Switching power is applied in chanrging circuit which consist of AC-DC converter, full bridge inverter and drive circuit, rectifier and filter circuit. Discharge circuit achieved high current and rapid discharging with Boost circuit.Good charging-discharging process flow was designed for system software,charging process allows manual input charging current and charging time. Fuzzy-PID control algorithm was used to achieve a sophisticated control technology, precision calibration of AD sampling module of DSP, and real-time statistics of filled battery power.At last, system commissioning is carried out, at the same time the stability, reliability,interactive features of the system is observed in the actual device processed. Different kind of charging technology experiments was conducted and Intermittent alternating current charge and with depolarization discharge charge technology was selected as the final use, which is short, high efficiency, and will not cause damage to the battery. The debugging and experiments of the system show that the air battery charge and discharge system designed can monitor battery status accuratly, still can charge the battery according to the battery state of .The system is also safe and reliable with advange of high efficiency, power to weight ratio.