5 channel analog filter hybrid module of i/o card of avionics equipment for airborne applications

摘要

The BHEEM-EU is an avionic Line Replaceble Unit for Indegenous Fighter Aircraft consisting of on board microprocessor based data acquisition and processing system. It plays an important role in controlling the Wheel Brake Management system, Nose Wheel Steering system, Undercarriage system and Monitoring of the Engine, Electrical and Hydraulic Power supply distribution systems. To control or monitoring of above said I systems, BHEEM-EU is interfaced elecrically with the above said systems. BHEEM-EU is designed in a moduler manner for data acquisition and processing. One of These modules is .I/O Card for data acqusation. I/O card interface to above said systems through analog, discrete & frequency elecrical input signal format. The analog inputs signals contains noice along with the signals due to acquiring from various systems in a A/C.ln addition that acqusation circuits are designed for protection from surge/ high voltage signal/ short circuit protection from unwanted conditions. For this purpose, Low Pass filters are used to suppress the Noise and protection circuit for elemianate unwanted conditions. In I/O card, analog inputs are 36 No."s and I/O card is a standard VA ATR size moduler design. To accommadate all 36 analog inputs acqusation cricuts along with other inputs acqusation circuits, it"s need to be custom designed filter circuit for analog input acqusation.For this purpose 5 channel Hybrid Filter is designed for lowpass filter & protection in I/O board of BHEEM-EU.