FIELD OF THE INVENTION
To provide EMI filtered signals with power supply to Signal Processing System by utilizing
discrete electronic components in an optimum space.
BACKGROUND OF THE INVENTION
In present scenario Aircraft system is having very advance technology. There are various
LRUs work in a combination for easy & safe flying and landing of the aircraft. In LRUs
various electronic signals come from the aircraft and the processing modules convert them
into suitable compatible format. First of all, the signals come to the backend architecture
through physical interface (Unit connector) in LRU level. The backend motherboard of the
LRU provides the communication channel to the signals to go to the processing modules for
conversion in compatible format.
SUMMARY OF PRESENT INVENTION
In accordance with one aspect of present invention is to provide a physical communication
interface between signal processing modules.
In accordance with second aspect of present invention is to provide a suitable flexi-rigid
backend to be fitted in less space inside in airborne system.
In accordance with another aspect of present invention is to provide Electomagnetic
interference free signals to signal processing modules in airborne system.
In accordance with yet another aspect of present invention is to provide a suitable ripple free
power supply to signal processing modules in airborne system
In accordance with yet another aspect of present invention is to provide backend
architecture for an easy and reliable fitment on mechanical interface of airborne system
In accordance with yet another aspect of present invention is to provide a physical interface
of ARINC 600 standard connector.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1: It shows the layout of backend architecture for signal Processing System.
(Details: P1= Physical Interface for Microcontroller based Central Processing
P2= Physical Interface for Discrete signal Processing
P3= Physical Interface for Analog, Video & Synchro signal Processing
P4= Physical Interface for Power supply module )
Figure 2: It shows the block diagram of Backend Architecture.
DETAILED DESCRIPTION
There are various signals come from the Aircraft at LRU level. The signals are in the form of
Analog signal, Discrete signal, Video signal, Synchro signal (AC Signals) and various
others. The proposed invention i.e. backend architecture provides the communication
channel of seven Analog signals, forty four discrete signals, Three component video & two
separate video signals for switching on display unit. It also provides communication media
for two synchro signals. The backend architecture is divided in three section PCBs joining
one another with Flexi section. The three sections are as follows:
1. LRU Interface PCB
2. EMI filter PCB
3. Edge connector PCB for physical interface of signal processing modules.
All above said signals come through LRU interface PCB to Edge connector PCB. The power
supply (28 V DC) of the LRU is also come through LRU interface PCB to Edge connector
PCB. Filter PCB is having miniaturized SMD type high performance EMI filters which do
filtering of analog and Discrete signals. Edge connector PCB also provide spike and ripple
free 28 V power supply to signal Processing modules. In Edge connector PCB, There are
three straight edge connectors for physical interface. First edge connector is for the physical
interface of central Microcontroller based signal processing, second edge connector is for
physical interface for Discrete signals processing and third edge connector is for physical
interface for Analog, Video and Synchro signal processing. All the three PCBs of backend
architecture are having 4 mounting holes on each corner of each PCB, so that it can be
easily fitted in mechanical enclosure with screw and nut.
As per fig:1: which shows the layout of the backend architecture of the airborne system.
There is combination of Rigid PCB and the flex section. They are attached in such a way
that even fully assembled backend architecture can be bent according to the requirement of
the space, no chance of fouling. Whole architecture can be baked at 100° C without any
deformation. The continuity of all the signals from LRU interface PCB to Edge connector
PCB is very good having the resistance < 5 ohm.

WE CLAIMS:-
Accordingly, the description of the present invention is to be considered as illustrative only and is for the purpose of teaching those skilled in the art of the best mode of carrying out the invention. The details may be varied substantially without departing from the spirit of the invention, and exclusive use of all modifications which are within the scope of the appended claims is reserved. We Claim

1. This Flexi and Rigid combination of backend architecture is easily fitted in less space.
2. This Flexi and rigid combination is more reliable and free from unavoidable loom dry soldering, & loom connection break.
3. It can sustain the extreme temperature range of -55°C to +125°C.
4. It can sustain up to 8g random vibration when working with whole LRU.
5. It is compatible with ARINC 600 standard physical interface and also can be used with MIL-C- 38999 series physical interface with slight modification.
6. Various electronic signals can be routed through this backend architecture without any EM interference.
7. It can be easily installed on mechanical chassis and very reliable. ,TagSPECI:As per Annexure-II