FIELD OF THE INVENTION
To provide the power backup for a period of pre-determined time to embedded
system, it is required to provide an interface for power backup in embedded
system. Power backup interface generally required for any emergency lapse of
main power supply. The primary role of this interface is to provide short –term
power when the main power source fails.
BACKGROUND OF THE INVENTION
Generally in case of helicopters, at the time of engine start, approx. after a predetermined
time, power is provided to embedded system. To remove the
recording error/ lapse in recording. It is required to provide backup solution for
embedded system. Earlier a DC-DC converter is used in embedded system to
provide various DC voltage outputs from main voltage supply. It is proposed to
use a hold up capacitor having high rating resistor to cater emergency power
backup problem. This interface is also capable of providing power in case of
drastic input voltage variations.
SUMMARY OF PRESENT INVENTION
In accordance with one aspect of present invention, this interface is to provide the
power backup to embedded system.
In accordance with second aspect of present invention, the given interface provide
the filtered power supply along with other voltage sources.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1: It shows the information about the connection diagram in between DCDC
converter, hold up capacitor & pre-determined resistor. Firstly, main power
supply charges capacitor, after that it provide power to DC-DC converter.
Figure 2: It shows the configuration of DC-DC converter and its functionality to
generate the different voltage levels generated by converter i.e. voltage level1,
voltage level 2. Further these voltages will converted to other voltages levels in
modules.
DETAILED DESCRIPTION
The functionality of system is as follows:
Refer figure no 1, with help of pre-determined resistor, capacitor and DC-DC
converter, initially operating voltage comes in Hold up capacitor. Hold up
capacitor is charged through resistive path provided by the system to operating
voltage. After charging, operating voltage supply is sent to DC-DC converter
through resistive path provide in system. In DC-DC converter operating voltage
further divided to various DC voltage levels for power requirements in electronics
modules. Whenever power interruption occurs, capacitor discharges to operating
voltage through given resistive path to generate the backup for pre-determined
time. Further, backup time can be increased with help of high rating hold up
capacitor and resistance. Appropriate hold up capacitor is required along with
resistor. For charging the capacitor, this system works as a bridge in between
capacitor and DC-DC converter. DC-DC converter is used to convert the given
operating voltage to required voltages. Above said system can be modified to cater
any kind of power backup requirement by modification in values of capacitor and
resistor. Even current loading can be catered by providing high/low rating
capacitors/resistors.

WE CLAIMS:-
Accordingly, the description of the present invention is to be considered as illustrative only and is for the purpose of providing the power backup to system with help of Hold up capacitor and appropriate resister and DC-DC converter . 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 power backup interface is able to work in any main supply voltage between 18-32V DC.
2. The power backup interface is able to provide backup in range of –55º C to +85º C.
3. The backup time can be modified with appropriate capacitor and resistor.
4. The system provides Input isolation of approx. 100V.
5. The system offers minimum Leakage current. ,TagSPECI:As per Annexure-II