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Fri, 22 Jun 2018 00:04:04 +0000
The Falcon Heavy beat United Launch Alliance’s Delta 4 in a competition under the Evolved Expendable Launch Vehicle program. SpaceNews.com
Thu, 21 Jun 2018 23:41:21 +0000
To receive FIRST UP Satcom, a weekly SpaceNews newsletter for satellite and telecom professionals, sign up here. TOP STORIES Chinese hackers tried to gain control of U.S. satellites in late 2017, leading a cyber firm to notify the U.S. government. Symantec’s protection software blocked some of the tools used by attackers known as “Thrip” that attacked two […] SpaceNews.com
Thu, 21 Jun 2018 22:56:40 +0000
Blue Origin expects to start flying people on its New Shepard suborbital vehicle “soon” and start selling tickets for commercial flights next year, a company executive said June 19. SpaceNews.com
Thu, 21 Jun 2018 21:41:59 +0000
Canadian satellite antenna manufacturer C-Com said June 21 it successfully tested the building blocks of a phased array antenna it hopes to sell next year. SpaceNews.com
Thu, 21 Jun 2018 15:25:18 +0000
Rogers: Whether you call the new branch a Space Corps or a Space Force is not all that important. SpaceNews.com
Thu, 21 Jun 2018 10:45:26 +0000
A report released by the White House June 20 outlines a set of goals to address the small but “high-consequence” threat posed by near Earth objects (NEOs), but does not commit to spending more money to achieve them. SpaceNews.com
Wed, 20 Jun 2018 19:52:56 +0000
Former Air Force Secretary Deborah Lee James: "The Air Force and the DoD have to come up with something to back up what the president said.” SpaceNews.com
Wed, 20 Jun 2018 15:57:18 +0000
China has lowered the orbit of its Tiangong-2 space lab, likely in preparation for deorbiting the orbital facility and thus averting a similar scenario to the uncontrolled re-entry of Tiangong-1 earlier this year. SpaceNews.com
Wed, 20 Jun 2018 12:13:10 +0000
Those who loathe or love a Space Force “separate but equal” to the Air Force must think and act decisively and quickly. Regardless of whether the Space Force actually materializes, deliberation alone could finally spring us into action to deal with the looming threat of space Pearl Harbor. SpaceNews.com
Wed, 20 Jun 2018 11:12:05 +0000
An advisory group dubbed the “think tank” for the National Space Council formally kicked off its work June 19 with a broad but vague mandate to study space policy issues. SpaceNews.com
Wed, 20 Jun 2018 00:08:21 +0000
Fleet operators SES and Intelsat asked the U.S. Federal Communications Commission to extend the deadline for their customers to register C-band dishes before the commission decides on the band’s future use. SpaceNews.com
Tue, 19 Jun 2018 11:00:08 +0000
Trump’s proposal derives from a growing debate inside military and political circles about how to best meet the threat posed to American space assets by potential enemies: Russia and China, to be precise. SpaceNews.com
Tue, 19 Jun 2018 01:45:44 +0000
A former NASA astronaut used an appearance at a National Space Council meeting June 18 to argue that a key element of NASA’s plans to return humans to the moon should be reconsidered. SpaceNews.com
Mon, 18 Jun 2018 19:35:34 +0000
Trump: Creating a Space Force and promoting space exploration by NASA and the private sector will be “important for the nation’s psyche.” SpaceNews.com
Mon, 18 Jun 2018 13:22:16 +0000
President Trump will sign a new space policy directive June 18 addressing space traffic management issues, closely following the proposed policy that Vice President Pence announced in April. SpaceNews.com
Mon, 18 Jun 2018 08:45:21 +0000
A key senator says he’s keeping an open mind regarding who in the federal government should have responsibility for the oversight of “non-traditional” commercial space activities. SpaceNews.com
Sat, 16 Jun 2018 19:45:35 +0000
The House Appropriations defense subcommittee approved $49.5 million to create a new “program of record for commercial satellite communications." SpaceNews.com
Fri, 15 Jun 2018 20:23:14 +0000
As the National Space Council prepares for its third public meeting, its activities to date have won widespread praise in the space community, even as there is some skepticism about the effectiveness of the council’s advisory group that will soon meet for the first time. SpaceNews.com
Fri, 15 Jun 2018 11:00:25 +0000
A House hearing on the reasons for cost and schedule problems with major NASA programs pointed blame at a wide variety of sources, from the tools used to track programs to the agency’s mindset to Congress itself. SpaceNews.com
Thu, 14 Jun 2018 19:59:03 +0000
Astranis, a startup developing geostationary satellites to offer broadband internet access, plans to equip its MicroGEO spacecraft with Bradford of the Netherland’s high performance green ECAPS thrusters. SpaceNews.com
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    Personal information
     Name:<withheld>
     Age:<withheld>
     Country:<withheld>
     Location:<withheld>
    Contact information
     Email:<withheld>
     Phone:<withheld>
     Mobile:<withheld>
    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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