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Wed, 17 Jan 2018 00:07:31 +0000
The Air Force will establish a three-star vice commander of Air Force Space Command to be located in the national capital region. SpaceNews.com
Tue, 16 Jan 2018 22:38:34 +0000
Virgin Orbit, which expects to debut the air-launched LauncherOne rocket by summer, signed a contract Jan. 16 with GomSpace to send eight nanosatellites into orbit next year to track airplanes and ships. SpaceNews.com
Tue, 16 Jan 2018 22:11:26 +0000
European launch provider Arianespace expects to conduct just 23 more Ariane 5 launches before the next-generation Ariane 6 becomes its primary rocket. SpaceNews.com
Tue, 16 Jan 2018 12:00:24 +0000
The new president of Canadian space technology company MDA says he sees opportunities for growth both within the country and beyond, while maintaining the company’s Canadian roots as part of a larger, and increasingly American, company. SpaceNews.com
Mon, 15 Jan 2018 20:44:32 +0000
The SBIRS satellites are equipped with powerful scanning and staring infrared sensors that collect data for use by the U.S. military to detect missile launches. SpaceNews.com
Mon, 15 Jan 2018 18:55:15 +0000
The plan is to shift the current ground software architecture to an open-systems platform that the Air Force would own and update with new technology as it becomes available. SpaceNews.com
Mon, 15 Jan 2018 12:00:22 +0000
The successful launch of an Indian Polar Satellite Launch Vehicle (PSLV) Jan. 11 marked not just the return to flight of the rocket but also major achievements for several of the companies with payloads on board the vehicle. SpaceNews.com
Fri, 12 Jan 2018 21:37:32 +0000
China Great Wall Industry Corp. landed a new satellite order Jan. 11 on the back of a bilateral meeting between Chinese and Cambodian officials that included an agreement to increase trade between the countries. SpaceNews.com
Fri, 12 Jan 2018 20:43:46 +0000
An independent safety panel recommended NASA not certify SpaceX’s commercial crew system until the agency better understands the behavior of pressure vessels linked to a Falcon 9 failure in 2016. SpaceNews.com
Fri, 12 Jan 2018 15:58:11 +0000
Virgin Galactic conducted its first test flight of its SpaceShipTwo suborbital vehicle in more than five months Jan. 11 as the company prepares to begin powered test flights of the vehicle. SpaceNews.com
Fri, 12 Jan 2018 14:55:04 +0000
The PSLV lifted off from the Satish Dhawan Space Centre at 10:59 p.m. Eastern and placed into orbit a Cartosat 2 imaging satellite and 30 secondary payloads. SpaceNews.com
Fri, 12 Jan 2018 12:09:38 +0000
Rocket Lab announced Jan. 11 it plans to make another attempt to launch its Electron small rocket on its second mission later this month. SpaceNews.com
Thu, 11 Jan 2018 22:59:37 +0000
Pentagon officials on the Zuma space mission: 'We're not going to be able to give you any more information' SpaceNews.com
Thu, 11 Jan 2018 19:31:37 +0000
The U.S. Air Force is focused on information technology, cybersecurity and small satellites to enhance weather capabilities in the near term rather than a new generation of large, sophisticated spacecraft to replace the Defense Meteorological Satellite Program. SpaceNews.com
Thu, 11 Jan 2018 17:39:01 +0000
SpaceX has delayed its two commercial crew test flights by four months, according to a new NASA schedule released Jan. 11, raising questions about whether it or Boeing will be able to send astronauts to the International Space Station by the end of the year as previously planned. SpaceNews.com
Thu, 11 Jan 2018 16:35:22 +0000
NOAA's future constellation could include a mix of large government-owned and government-operated satellites, imaging instruments hosted on commercial satellites, small satellites in low Earth orbit and data purchased from commercial firms. SpaceNews.com
Thu, 11 Jan 2018 09:36:21 +0000
NASA announced Jan. 10 that it was renaming the Swift astronomy spacecraft after its former principal investigator, who passed away last year. SpaceNews.com
Thu, 11 Jan 2018 04:26:35 +0000
Spanish rocket startup PLD Space received 2 million euros ($2.4 million) from a European Commission grant program to further the development of a pair of launchers designed for small satellites. SpaceNews.com
Thu, 11 Jan 2018 03:46:29 +0000
Growing demand by terrestrial wireless firms threatens the federal government’s exclusive use of spectrum traditionally reserved for NOAA satellite broadcasts to emergency managers, meteorologists and researchers. SpaceNews.com
Wed, 10 Jan 2018 22:37:13 +0000
The U.S. National Oceanic and Atmospheric Agency may be able to slash the cost of transmitting data from its next generation of weather satellites by turning to commercial communications services. 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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