Packages for Laser Target Designators
1000j/s charging unit
DRDO has developed a novel DC-to-DC converter design topology iDEALly suited for
power converters used as charging units for energy storage capacitor banks in
flash-pumped pulsed solid-state lasers. The design methodology has been
evaluated by building hardware typical of a battlefield laser target designator.
The developed hardware, a DC-to-DC converter module with an input voltage range
of 18 V to 32 V and output power delivery capability of 375 J/s, is capable of
charging a 30 µF capacitor to 1000 V in 40 ms with a conversion efficiency
greater than 85 per cent. The design has also been validated by building the
hardware of a 1000 J/s unit. The new topology gives the user flexibility to use
any energy/pulse and repetition rate combination. For instance, 1000 J/s unit
can be used at 10 J/pulse at 100 pps or 100 J/pulse at 10 pps or even 1000
J/pulse at 1 pps with same ease and conversion efficiency without any design
modification. It also allows the designer to use a wide range of energy storage
capacitor (5 µF to 200 µF) and charging voltage (500 V DC to 1500 V DC) to get
the desired energy without compromising any of its features. The design topology
has led to hardware having a packaging density of greater than 7 W/inch3 as
compared to a figure of about 4.5 W/inch3 of similar units with comparable
specifications from leading international manufacturers.
DRDO has established core competence in developing compact electronics packages
for high energy pulsed solid-state lasers.