Open collector buffer hybird module in code card of avionics equipment for airborne applications

摘要

The BHEEM-EU is an avionic Line Replaceble Unit for lndegenous 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 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 CODE Card for data acqusation and generation. CODE card interface to above said systems through analog & discrete elecrical input/output signal format. The discrete electrical outputs are generated through mechinal/ solidstate relays. These relayes are operated through software computed digital processing data. Inorder to control relays through digital data, it is required pull-up based open collector buffer. For this purpose, Open Collector Buffer Hybrid Module are used to operate the Mechanical/Solidstate Relays. In CODE card, discrete outputs are 24 No."s. Since CODE card is a standard Vi ATR size moduler design. To accommadate all 24 discrete outputs generation cricuts along with other inputs acqusation/ output geneartion circuits, it"s need to be custom designed Open Collector Buffer circuit for discrete output generation.For this purpose 11 channel Open Collector Buffer Hybrid Module is designed in CODE board of BHEEM-EU. Fig 4: 1/2 ATR BHEEM-EU Avionics unit with 1 No. CODE card Fig 5: CODE card with 10- Channel Analog Output Filter Hybrid Module