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Prashant12

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MoU signed for Transfer of Technology for Manufacturing of HMC DC-DC Converters

ISRO Satellite Centre (ISAC), Bengaluru, is the lead centre of ISRO for design, development, fabrication and testing of all Indian made satellites. One of the priorities of the centre is to develop and promote crucial technologies that lead to self-reliance of Indian Space Programme. ISAC has designed, developed and qualified a 30W Hybrid Micro Circuit (HMC) DC-DC Converter for space applications.



The DC-DC converters are extensively used in satellites to convert variable input voltage from solar array and battery to multiple regulated DC voltages as per subsystem requirements. The HMC converters, which is switched at high frequency has better efficiency, reduced size, weight and improved thermal management compared to linear regulators. This converter is designed by Power Systems Group of ISAC and is based on forward topology switching at 250 KHz.

The challenge here was to develop the HMC converter that meets electrical performance with high reliability requirements for space applications with minimum size and weight. The critical challenges for realising the HMC DC-DC converter are:

  • Developing the HMC DC-DC converter with large power dissipation and current handling capabilities with stringent line and load regulation specifications.
  • Realising the converter HMC with minimum size and weight.
  • Complete electrical testing of the converter at substrate level prior to packaging.
  • Special attachment process to incorporate pot core transformer sub-assembly inside HMC along with unique assembly sequence for realisation of the HMC converter.
The HMC DC-DC converter with the above challenges for Space Application has been realised adopting Innovative Thick Film Process Technology consisting of fifteen new processes and seven special sub-assemblies and an unique assembly sequence that has been developed in-house at HMC facility of ISAC. All the new processes and special sub-assemblies and their unique attachment techniques have been qualified for flight application through a rigorous process qualification programme.

The first batch of flight HMC converters are ready for use in the satellites. In order to meet large number of DC-DC converter requirement for multiple satellite programmes of ISRO, it is proposed to productionise these HMC converters through existing qualified HMC vendors. In view of this, three Memoranda of Understanding (MOU) have been signed recently by ISAC with M/s Centum Electronics, Bengaluru, M/s KHMD Bengaluru and M/s VCB Electronics, Pune for the transfer of technology know-how for the manufacture of HMC DC-DC converters.

HMC DC-DC Converters



http://www.isro.gov.in/mou-signed-transfer-of-technology-manufacturing-of-hmc-dc-dc-converters
 
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Indigenous GSLV engine faces key test, to propel rocket with heavy payload on Sept 7

CHENNAI: Riding high on two previous successful GSLV flights powered by indigenously-developed engine, India's cryogenic technology will go through another litmus test when it propels a GSLV rocket with one of the heaviest satellites in the INSAT/GSAT series on Thursday evening.

After three developmental flights, Isro scientists are now confident about the technology since they have declared Thursday's launch as the first operational flight with the indigenous cryogenic engine. GSLV is a three-stage launch vehicle and a cryogenic engine is used in the third or upper stage. A 2,211kg INSAT-3DR, an advanced weather satellite, will take-off on board GSLV-F05 from the Sriharikota spaceport.

"When we build a new rocket, we do a developmental flight to ascertain if it will work properly. Once we are confident, we call it an operational flight which will be considered a routine launch," an Isro scientist said. "GSLV-F05 will place the satellite in the geostationary transfer orbit from where the satellite with its propellant will raise to its final geostationary orbit," he said.

Cryogenic engines use liquid hydrogen as fuel and liquid oxygen as oxidizer to burn the fuel. It can produce 1.5 times the thrust compared to liquid rocket engines.

After a decade of development and flawless tests, the maiden developmental flight of the indigenous engine conducted on April 15, 2010 did not succeed. The GSLV, carrying a 2,220kg a communication satellite, plunged into the Bay of Bengal after take-off. The turbo pump supplying fuel to the engine had stopped. Critical modifications were made to the engine and the rocket before its first successful flight in 2014 and in 2015.

The development of indigenous cryogenic engines comes after all the Russia-supplied engines were used. These engines are essential to put satellites in geostationary orbit, but the technology - to burn a super-cooled fuel at extremely high temperatures - was sophisticated. Isro had to develop a material that could withstand high temperature and pressure during combustion.

http://timesofindia.indiatimes.com/...y-payload-on-Sept-7/articleshow/54039419.cms?
 
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Sep 08, 2016

GSLV-F05 / INSAT-3DR Mission: GS1 Stage Seperated. GS2 Ignited
Sep 08, 2016 Cryo Stage Ignition is authorized
Sep 08, 2016 GSLV-F05 / INSAT-3DR Mission: Cryogenic Ignition confirmed
Sep 08, 2016 GSLV-F05 / INSAT-3DR Mission: GS2 Performance is normal
Sep 08, 2016 GSLV-F05 / INSAT-3DR Mission: Heat Shield Separated
Sep 08, 2016 GSLV-F05 / INSAT-3DR Mission: Lift-off Normal
Sep 08, 2016 GSLV-F05 Mission Director Authorized the Launch
Sep 08, 2016 Launch is rescheduled to 16:50 hr IST Countdown is progressing normally
Sep 08, 2016 Real Time System simulation checks Completed by 08:15 hr IST. Countdown is progressing normally
Sep 08, 2016 N2O4 filling into four L40 Strap-On Stages completed by 03:00 hr IST
 
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