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Tue, 25 Sep 2018 23:01:45 +0000
Thornberry said he worries that too much attention is being paid to org charts and not enough to the substance of what space forces need. SpaceNews.com
Tue, 25 Sep 2018 18:47:52 +0000
A long-overdue exploration roadmap report released by NASA Sept. 24 offers an overview of the agency’s plans to send humans back to the moon and on to Mars, but few new details about how to carry out those plans. SpaceNews.com
Tue, 25 Sep 2018 17:42:53 +0000
Israeli satellite operator Spacecom said Sept. 25 that it has terminated contracts awarded earlier this spring to manufacturer Space Systems Loral and launch provider SpaceX for Amos-8, a telecommunications satellite the Israeli government said Sept. 3 would be built in Israel instead. SpaceNews.com
Tue, 25 Sep 2018 10:56:24 +0000
With growing doubts it will be selected by United Launch Alliance for its Vulcan rocket, Aerojet Rocketdyne is looking to smaller launch vehicles as potential customers for its AR1 engine. SpaceNews.com
Mon, 24 Sep 2018 23:30:02 +0000
NASA Administrator Jim Bridenstine played down any differences with his Russian counterpart as he gears up for meetings with him and other space agency leaders to discuss cooperation on NASA’s exploration plans. SpaceNews.com
Mon, 24 Sep 2018 12:31:35 +0000
If all goes as currently planned, sometime in 2022 a rocket will lift off carrying a payload that at first glance will look familiar. This payload, though, won’t be destined for geostationary orbit. Instead, the spacecraft will head to cislunar space. SpaceNews.com
Mon, 24 Sep 2018 10:40:01 +0000
Faced with growing competition from startups entering the field, Northrop Grumman Innovation Systems is looking to reduce costs on its existing Pegasus and Minotaur rockets. SpaceNews.com
Sun, 23 Sep 2018 15:10:09 +0000
With Congress set to approve a Federal Aviation Administration bill with some commercial space provisions, those in the industry are hoping for action on other bills before the end of this year. SpaceNews.com
Sat, 22 Sep 2018 00:22:48 +0000
It is evident we need to examine how to build a robust space economy and infrastructure, one built to accommodate future growth. SpaceNews.com
Fri, 21 Sep 2018 10:37:57 +0000
NASA is planning two alternative reviews of an airborne observatory amid conflicting congressional views on whether the program will be eligible for the next senior review of astrophysics missions. SpaceNews.com
Thu, 20 Sep 2018 23:58:10 +0000
One thing a highball estimate does accomplish is “shift the debate to how expensive this is going to be." SpaceNews.com
Thu, 20 Sep 2018 22:06:46 +0000
NOAA awarded more than $8 million in contracts this week to three companies in the second round of a commercial satellite weather data pilot program. SpaceNews.com
Thu, 20 Sep 2018 21:00:48 +0000
European launch provider Arianespace signed a contract with the Korean Aerospace Research Institute for a Vega C mission Sept. 20, growing the rocket’s backlog to five as its debut launch nears. SpaceNews.com
Thu, 20 Sep 2018 18:19:43 +0000
Whoever signs up for one of two certification flights for the Omega rocket, will get a ride “at a reduced rate." SpaceNews.com
Thu, 20 Sep 2018 01:45:58 +0000
"It doesn't necessarily mean buying a company. It could be buying a product line. It could be buying a portion of a business that fits with us. We want to make sure that it's strategic." SpaceNews.com
Wed, 19 Sep 2018 23:51:28 +0000
Bezos: At a time of increasing global competition, “You have to be able to go to space more frequently, with less lead time." SpaceNews.com
Wed, 19 Sep 2018 23:32:28 +0000
Kleos Space, a company developing a constellation of satellites for radiofrequency geolocation work, will launch its first satellites in 2019 with Rocket Lab under a deal announced Sept. 19. SpaceNews.com
Wed, 19 Sep 2018 20:27:57 +0000
A Georgia county seeking to develop a spaceport has attracted a small launch vehicle company to set up operations and, hopefully, launch from there. SpaceNews.com
Wed, 19 Sep 2018 19:28:56 +0000
Shanahan on space reorganization: “We’re going to find the best way. There will be some hammering and arm wrestling. " SpaceNews.com
Wed, 19 Sep 2018 15:12:29 +0000
Gen. Jay Raymond: “There’s an explosion of things happening in the commercial industry. We want to capitalize on that." SpaceNews.com
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    Personal information
     Name:<withheld>
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    Contact information
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    Candidate Profile
     Date Submitted:04-09-2016
     Last Modified:04-09-2016 (01:55)
    Job information
     Current job:Team Lead
     Employment Term:Permanent
     Job location:Anywhere
     Date available:within 2 months
     Industry:
     KeywordsPower electronics, design engineer, dc dc converter , switching regulator
    CV

    ISRO Satellite Centre, Bangalore, India                            

    Objective:

    To obtain a challenging position that will enable me to use my organizational skills, educational background and ability to work well as a team member. I will work my best to contribute to the growth of the organization and to the growth of my career. I have more than 5 years of experience in development of various kind of power supply like dc-dc converter, power processing unit for various ion thrusters for space application. I also have sound knowledge of various kind of Military standard required for qualify develop products.

    Employment:

     

    Company       :  ISRO Satellite Centre, Indian Space Research Organization

    Location         :  Bangalore

    Country          :  India

    Job Title         :  Scientist/Engineer

                Job Role        :  Research and development of Power units for ion thrusters and dc-dc converters

                Duration        :  Aug 2011 to till date

     

    Projects Summary:

    As a member of Power Conditioning and Distribution Section, Power Electronics Division, my major responsibilities are to develop various kind of power supplies required for ongoing projects.

    My contributions are

     

    POWER PROCESSING UNIT FOR 18mN ,75mN and 300mN ELECTRIC ION THRUSTER (PPU)

    Realization of proto and flight model of PPU for ongoing GSAT-9 18mN ion thruster and involved during interface between ion thruster, NCT package and PPU and debug the problems during interface test. Also involved in design and development of PPU for 75mN and 300mN ion thruster for future projects.

     

    Anode Supply :

    Anode Supply for Gsat-9 18mN ion thruster:

    Realized buck cascade push pull topology based 300V/1.5A constant voltage power supply. Ignition circuit also designed from Anode Supply to ignite thruster with high surge current and also 0.6A constant keeper supply Ored with ignition.

    Development of 550V/1.5A constant voltage module supply to get 550V/3A anode supply (2 modules in parallel) for 75mN thruster and 550V/9A anode supply (6 modules in parallel). Ignition circuit is also designed from Anode supply (requirement of ignition circuit: 300V, 60A surge current). Ignition circuit and anode module are developed and successfully interfaced with 75mN ion thruster.

     

    Heater Supply

    Heater Supply for Gsat-9 18mN thruster :  Realized isolated 12A constant current power supply   for load range of 0.2 ohm to 1.5 ohm  for GSAT-9

    Heater Supply for 75mN thruster: Developed isolated constant current power supply with DAC interface to get initialization current of 1A, 3A, 5A, 7A and 8.3A constant current for resistance range of 0.2 ohm to 2 ohm. Heater supply is developed and interfaced with 75mN thruster successfully.

     

    Magnet Supply :

    Magnet Supply for Gsat-9 18mN thruster: Realized magnet power supply of 1.8A for inner magnet and 1.4A for outer magnet with two outputs single power supply.

    Magnet supply for 75mN: Constant current power supply with step change from 1.4A to 1.8A similar to heater supply made for 75mN and successfully interfaced with 75mN thruster.

     

    Realization of bias supply , Output Filter , switching circuit for 18mN thruster:

    Realization of 3 numbers of 10W fly back topology based converter to provide isolated bias supply to various power module in PPU.

    Realization of filter box between anode supply of PPU and thruster anode

    Switching circuit is also realized to power on and off various power module of PPU

     

    Interface between proto model of PPU, 18mN ion thruster and NCT package

    Involved during interface between proto model and flight model of GSAT-9 PPU, thruster and NCT control package and troubleshoot problems when encountered.

     

    BATTERY CHARGE REGULATOR:

    BCR For 70V bus :

    Development of 750W BCR (buck converter) Engineering model for autonomous charging of battery in satellite from Bus.

    3D control loop implementation to take care of bus priority over battery charging and taper the current as battery gets fully charge.

    Qualification model of BCR is under progress

    Flight model Is planned for NISAR and RISAT projects

     

    DESIGN AND DEVELOPMENT OF ISOLATED DC-DC CONVERTER

    10 W fly back topology based dc-dc converter with multiple output

    Design and develop 10W three outputs dc-dc converter for 42V and 70V bus.

    Qualify this converter to meet all Military standard like EMI, vibration, thermovac etc

    First flight model Flown in IRNSS-1G

     

    40 W Single output Forward topology based low voltage high current converter

    Development of 3.3V/8A and 5V/8A single output converter for space application

    Qualification of this converter for both 42V bus and 70V bus

    Planned for future spacecraft like Risat-2, Cartosat-3

     

    Supervisees the vendors for  Production of 4.5W and 20W converter dc-dc converter

    Supervises the vendors and troubleshoot all problems when encountered during production of fly back topology based 4.5W converter and forward topology based 20W dc-dc converter.

    Involved in modification of 20W converter to work as 60W converter.

     

    LINEAR REGULATOR LDO

     

    Requirement: Subsystem are facing problem with imported LDO like OM7764 is whenever 1553 transient is there, they observe change in output voltage that degrade the performance of their package. For improvement they are forced to use high value of capacitors which results in oscillation for some users. This is the driving factor for us to develop current control based indigenous LDO which support 1553 transition of no load to 3A also without any overshoot and with less capacitor of 22 uF instead of 680 uF.

    Two versions of LDO were designed. One with Mosfet as a pass element and the other was Transistor as a pass element.

    Both the circuits were simulated using PSPICE.

    The MOSFET based circuit is used in 10W DC-DC converter for output voltage of +5V.

    The transistor based LDO is hybridized and realized as an off the shelf product.

    The pin configuration and the size of the hybridized LDO package is maintained similar to existing imported package OM7764 (IR LDO)

    The HMC was tested for various specifications at ambient temperature and -40 to +65 at thermovac.

    Interacted with SRG for carrying out the derating analysis.

     

    MODELING AND SIMULATION:

     

    Simulation of Power processing unit for ion thruster various power supply like Heater, Magnet and Anode in PSIM

    Simulation of Battery charge regulator in PSIM with 3D control system

    Simulation of EMI filter and studied the effect for the same on input impedance of various power supply in PSIM and PSPICE

    Modeling and simulation of 40W (5V/8A) forward converter and 10W fly back converter and 20W forward converter in Simulink/Mat lab and used this model for feedback controller design for converters.

     

    Modeling of saturable core and simulation of magnetic current sensor       (unidirectional and bidirectional) for sensing dc current up to 1000A in PSIM software without fold back

    Simulation and analysis of effect of multi-junction Solar Array capacitance, inductance and resistance of harness on Switching String for 42V Bus application in ORCAD as well as in  MATLAB.

    Simulation of various analog circuit used during design of power supply in Orcad /Pspice.

    Software Used :  PSIM, Orcad/Pspice, Simulink/Mat lab

     

    Skills

     

    Sound knowledge of various MIL Standard used for space application products like Derating analysis, Thermovac condition, vibration limit, EMI requirement etc.

    Good knowledge of EMI filter design for power supply to meet MIL STD

    Experience in end to end design and development of various topology of dc-dc converter and qualify the design for space application.

    Experience in design and development of low dropout regulator for satellite application

    Experience in Hybridization of dc-dc converter and LDO to reduce the size from SMT version

    Sound knowledge of various software like Pspice, PSIM, Matlab etc

    Experience in working on ADC, DAC and Microcontroller for mixed signal operation.

     

    Educational Qualification:

     

    Bachelor in Avionics from Indian Institute of space science and technology with CGPA of  8.73./10 (www.iist.ac.in)

    Pre – University course, Bihar intermediate science with Percentage: 75.4%  (3rd topper in state board)

    Matriculation  (Class X), C.B.S.E, with Percentage: 89.4%

     

                  

    PUBLICATION:

     

    “Simulation And Verification of Discontinuous Mode Fly back Dc-dc Converter Using Simulink” in Mat lab Expo 2014, Bangalore.

    “Effect Of Solar Cell Capacitance And Interface Cable Inductance On The Shunt Switch Current Transients In Spacecraft Power Conditioning Unit” in IEEE international conference ICRAIE-2014, Jaipur.

    “Modeling of Solar array and Analyze the Current Transient Response of Shunt Switch Voltage Regulator in Spacecraft Power Conditioning Unit” in Journal of Advanced Computing and Communication Technologies (ISSN: 2347 - 2804) Volume No.3 Issue No. 2, April 2015 pp 33-39


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