FIELD OF THE INVENTION
Equipment for generating the 50ms power interruption on Power supply
lines and verify the functionality of electronic system after subjecting it to power
interruption.
BACKGROUND OF THE INVENTION
The aircraft power supply has been the subject of study over the years by
numerous aircraft designers. Primarily, the aircraft supply is either +28 V DC supply
or 115 V AC supply. There has been recorded evidence that the aircraft system is
subjected to two kinds of power interruption in the aircraft supply. Firstly, the
aircraft power supply is disconnected for a duration ranging from 30 to 100 milli
seconds & secondly the aircraft supply of +28 VDC is found to dip up to 12 VDC
during engine start.
The present invention is directed to generate & simulate aircraft condition on ground
by providing a power supply interruption to the unit under test. The present
invention utilizes the discrete components to provide a regulated supply output of
+28 VDC & when desired the supply can be disconnected & connected back in
milliseconds duration. The present invention can be connected in any airborne
unit/ground unit in the power supply line to generate & test the units for their
performance to catering to the above requirements.
SUMMARY OF PRESENT INVENTION
In accordance with one aspect of present invention, equipment for
generating 50ms is made using generic chassis and relay module for power
interruption on the power supply lines for Unit under test. 28V DC is connected to
relay modules and timing and controlling of the switching is taking place with the
help of GUI.
Annexure‐II
In accordance with another aspect of present invention, the equipment is
provisioned for generating and testing the unit under test for more or less than
50ms power interruption. Detail description of the equipment is described in the
subsequent paragraph.
SSFDR is power up with the 28V DC power supply through the power
interruption circuit and record mode is selected by setting the mode pins of the
SSFDR to open circuit. Configure the frame size of ARINC-717 to 512words/sec.
Insert the predefined sync words in all the sub frames. ARINC-717 data (512
words/sec) is transmitted to the SSFDR (as shown in the Fig. 2). SSFDR will receive
the ARINC-717 data and process it. During the processing of ARINC-717 data,
SSFDR updates ARINC-717 with the internal parameters like elapsed time,
PBIT/CBIT and sortie count etc. and send the updated data to the crash protected
memory module (PMM) and same data shall be transmitted to RS 422 from SSFDR.
Test setup will convert the RS 422 data into USB. RS 422 data transmitted
from SSFDR shall received by the laptop through USB in form of HEX format. GUI
software shall extract the sortie number from predefined location of the HEX data
stream received through RS 422. The HEX string corresponding to the sortie
numbers shall be converted to the decimal number.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1: It shows the basic Block Diagram to generate the 50ms Interruption.
Figure 2: This figure describes the graphical representation (GUI) to simulate the
50ms Interruption
Figure 3: Setup to verify the functionality during power interruption.
Annexure‐II
DETAILED DESCRIPTION
This equipment has the capability of simulating 50ms power interruption,
mode selection and ARINC-717 data simulation at 512words/sec. There is a
flexibility to simulate the any data on ARINC-717 bus. Graphical user interface (GUI)
using Lab-View is used to perform the 50ms power interruption test. To verify the
functionality of SSFDR/Unit under test during power interruption following procedure
has been developed.
• Power up the SSFDR through power interruption circuit.
• Simulate the ARINC-717 (512 words/sec) data.
• SSFDR shall receive the ARIN-717 data and update with internal
parameter.
• SSFDR shall transmit the data through RS-422 port.
• Read the sortie count number before power interruption.
• Convert the RAW data into engineering data corresponding to sortie
number.
• Select to duration of interruption in GUI software.
• Generate the power interruption
• Monitor the duration of interruption with the help of oscilloscope.
• Make sure that that the width of interruption matches with required width
• Again read the sortie number after power interruption.
• Compare both the sortie number (Before and after power interruption).
If both sortie number are same then SSFDR capable of handling the 50ms power
interruption and declared as PASS and if both the sortie are different then SSFDR is
declare as FAIL

WE CLIAMS:-
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 that

1. The present system, comprising
- A generic chassis with a relay module, with suitable interface modules,
- A computing device with display to control relay module via chassis &
- Looms & cables for interconnection of generic chassis, computing device and unit under test.
2. The system according to claim 1, capable of generating power interruption for atleast 10 msec.
3. The system according to claim 1, capable of monitoring the health of Unit under test with suitable interface.
4. The system according to claim 1, controlled using a Graphical User Interface (GUI) for generation of power interruption.
5. The system according to claim 1, is light weight, based on modular architecture. ,TagSPECI:As per Annexure-II