Potting was the biggest trade-off I've made on rugged supplies, because it buys you serious shock and moisture protection, but it can trap heat and make field repair close to impossible. I balanced it by only encapsulating the parts that needed mechanical support, keeping heat paths clear, and leaning on conformal coating elsewhere so serviceability stayed realistic. My advice is to start with the real environment, vibration profiles and temperature swings, then choose protection that you can cool and still maintain, not the most extreme option by default.
A common trade off came when deciding between maximum power density and long term durability. In theory you can design a very compact power supply that delivers high output, but packing components tightly together often creates more heat and makes the system harder to cool in rough environments. In one project we chose to give up some compactness to improve reliability. The internal layout was spaced more carefully so heat could move away from sensitive components and the casing could dissipate it more effectively. The unit ended up slightly larger than the most aggressive design option, but it performed much more consistently in high temperature and dusty field conditions. The balance came from focusing on the real operating environment instead of only the lab performance numbers. For military or industrial systems, reliability over long periods usually matters more than squeezing out a little extra performance. My advice would be to design around the worst case conditions the equipment might face. If the system can stay stable under heat, vibration, and long run times, it will almost always deliver better value than a design that looks impressive on paper but struggles in the field.
Designing rugged power supplies for military or industrial use requires balancing performance and durability. These power supplies must offer high efficiency and quick load response to support demanding applications. At the same time, they need robust construction to withstand harsh environments. As a Director of Marketing, I must effectively communicate the value these supplies provide while addressing the concerns of our target audience.
Designing a rugged power supply for military or industrial use involves balancing weight and durability. Enhancing robustness with heavy-duty materials can increase weight, while lightweight materials might compromise resistance to harsh conditions like extreme temperatures and vibrations. Strategic decisions must be informed by the end-use environment, focusing on performance metrics such as voltage stability, efficiency, and operational capacity under varying conditions.
Without getting into the details of the design of a power supply, arguably the best thing is to get it listed to the applicable UL code. There are many UL codes out there applicable to power supplies. But the ones most relevant are definitely UL 61010-1 / UL 61010-2-201 along with the IEC Codes such as IEC 61010-2-201 (these IEC and UL codes inter-relate). Getting certification is never easy, but if you want to hand that off to the certifying entity (or NRTL) it is the smoothest path.
When it comes to designing rugged power supplies, one of the most important considerations to keep in mind is the trade-off between high performance and long term reliability. In general, a lightweight, small, and highly power-dense power supply may appear ideal in theory, but in reality, it will typically operate at much tighter thermal margins and be less tolerant of mechanical stressors (vibration, heat, dust, moisture, and unstable input power). Particularly for military or industrial applications, it is typically best to design a more robust chassis or accept a slightly lower level of efficiency in exchange for providing a greater degree of protection, a higher cooling capacity, and a higher overall level of reliability. The best way to achieve a good balance of performance and reliability is to design according to actual environmental/field conditions from the very beginning of the design process. To accomplish this, use conservative component ratings, provide additional thermal margins, provide reinforcement of mechanical failure points, and test under actual field conditions (rather than just laboratory conditions). I have been in the industry for over 20 years and I can tell you that designing for reliability will always take precedence over designing solely for maximum performance figures. A rugged power supply that can deliver consistent operational capability in harsh environments regardless of its performance level when tested in ideal laboratory conditions will always have a greater overall value than a rugged power supply that has the ability to achieve stunning results under controlled laboratory conditions.