Battery & Electrification Technology - November/December 2024 - 7

parts from Gaia Converter who have long
experience supplying power conversion
products to the hi-rel market.
An EMC filter, part FGDS12A100, enables
compliance with military standard MILSTD-461
while the pre-conditioner module
LHUG150 attenuates spikes and surges according
to MIL-STD-1275, while providing
active hold-up with supply dips from an
external capacitor. This is kept 'boosted' up
to a high voltage, whatever the input. The
module handles loads up to 150W total at
nominal voltages between 9-60VDC and
incorporates reverse polarity protection,
inrush control and soft start. Synchronization
signals in two anti-phases are also generated
for the downstream converters.
The end-load DC-DC converters shown
are from Gaia's compact MGD range,
which are available with ratings from 4
to 500W. The encapsulated parts are suitable
for cold-plate cooling and feature
remote sense, voltage trim, an ON-OFF
function and secure protection features
which include output over-voltage and
over-current, over-temperature and input
under-voltage. Isolation is 1500VDC.
Conclusion
eVTOL power system architectures are
not yet well defined, and with the wide
variety of possible configurations, from
small, unmanned drones through multiseat
passenger craft, there may never be
one standard. However, use of modular,
scalable DC-DCs from a supplier such as
Gaia Converter, with their track record and
certifications in the hi-rel market, results in
an economical, safe, and secure solution.
This article was written by Christian
Jonglas, Customer Support Manager, Gaia
Converter (Haillan, France). For more information,
visit www.gaia-converter.com. 
References
1. eVTOL Aircraft Market by Lift Technology,
Propulsion Type, System, Mode of Operation,
Application, MTOW, Range and Region - Global
Forecast to 2030. Markets and Markets. 2022.
https://www.marketsandmarkets.com/MarketReports/evtol-aircraft-market-28054110.html
2.
Joby Completes Third Stage of FAA Certification
Process. February 2024. https://www.jobyaviation.
com/news/joby-completes-third-stage-faacertification-process/
3.
Counting the Cost of Urban Air Mobility Flights.
AIN Media Group. November 2021.
https://www.futureflight .aero/newsarticle/2021-11-15/counting-cost-urban-airmobility-flights
Battery
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