Further Reading in the Military Power Integrity Series

Reliable power design for military platforms requires a deep understanding of the electrical environment found in 28V vehicle power systems, armored platforms, and UAV power architectures. Engineers working under standards such as MIL-STD-1275, MIL-STD-461, and MIL-STD-810 must account for severe electrical conditions including surge pulses, voltage collapse during engine start, ground shifts, electromagnetic interference, and dynamic load interactions.

This article is part of a technical series examining Power Integrity in mission-critical defense electronics, focusing on practical engineering challenges encountered in real military platforms and how robust DC/DC architectures can ensure system stability.

For additional technical insight, see also:

• MIL-STD-1275F: Advanced Protection in Military Power Systems – In-Depth Understanding of Transient Surge
• DC/DC Converter for MIL-STD-1275F: What a 24V→12V Power Supply That Truly Survives “Electrical Hell” Looks Like
• Power Integrity in Military Vehicle Platforms: Why Systems Fail Even When Power Supplies Meet the Standard
• Ground Shifts in Military Vehicles: The Silent Cause of System Instability Under MIL-STD-1275E/F Conditions
• Why Systems Reset Even When Voltage Stays “Within Range”
• EMI in UAV Power Systems: When Electrical Noise Looks Like a Software Failure
• Designing Power Architectures for MIL-STD-1275E/F Military Vehicle Systems

If your 28VDC system is protected by a circuit breaker, a diode, and a TVS, there is a good chance it is very well protected against the problems of 1995.

It is not necessarily protected against the problems of 2026.

That may sound strange.

After all:

There is a circuit breaker.

There is a diode.

There is a 5kW TVS.

What could possibly go wrong?

The answer is: a lot.

Far too many military systems fail today not because of short circuits, overloads, or extreme surge events.

They fail because of dozens of small electrical events that nobody specifically designed for.

Events that do not trip the breaker.

Events that do not destroy the TVS.

Events that never appear in qualification reports.

Yet they still manage to cause:

• Random resets
• Communication loss
• Mission computer crashes
• IMU reboots
• Navigation data loss
• Unpredictable software behavior

And that is precisely the difference between a system that passes laboratory testing and a system that survives for years on an operational platform.

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The First Mistake: A Circuit Breaker Protects Wiring, Not Electronics

This may be the most important point in this article.

A circuit breaker was never designed to protect:

• Mission computers
• AI processing units
• Navigation systems
• Thermal imaging systems
• RF equipment

Its primary purpose is to prevent wiring damage and fire caused by excessive current.

That is all.

If the bus voltage rises to 80V for 50ms?

The breaker does nothing.

If the battery is connected in reverse?

The breaker does nothing.

If a brownout causes a mission computer reset?

The breaker does nothing.

In fact, in many of the scenarios that bring down modern military electronics, the breaker does not even know anything happened.

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The Real Enemy of 28V Systems Is Not Surge – It Is Reverse Battery

Almost every MIL-STD-1275 presentation includes a dramatic 100V surge waveform.

Everyone fears it.

Very few people fear the technician who accidentally connects the battery backwards.

Which is strange.

Because in the real world, reverse battery events are far more common.

They can be caused by:

• Battery replacement in the field
• Jump-start operations
• External power connections
• Maintenance activities
• Human error

The key difference is that a surge lasts milliseconds.

A reverse battery condition can last minutes.

Sometimes hours.

For many systems, the real damage does not come from 100V.

It comes from 28V.

Connected the wrong way.

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Why a TVS Alone Does Not Save Military Electronics

There is a statement heard repeatedly:

“We installed a 5kW TVS. We’re covered.”

No.

A TVS is important.

But it is not a complete protection strategy.

A TVS cannot:

• Limit current
• Handle reverse battery conditions
• Prevent brownouts
• Filter ripple
• Manage inrush current
• Protect against ground shifts

Furthermore, every significant transient event consumes part of its lifetime.

The question should not be:

“Do we have a TVS?”

The real question is:

“What happens when the TVS is no longer enough?”

Modern military systems require multiple layers of protection.

A TVS is only one of them.

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Why Load Dump Is Only Part of the Story

If you judge by the internet, you might think that Load Dump is the only threat in a 28V vehicle power system.

In reality?

It is only one item on a very long list.

A real military platform must deal with:

• Reverse Battery
• Engine Cranking
• Cold Cranking
• Ripple
• Inductive Switching
• Ground Shift
• EMI
• Brownout
• Short Circuit
• Overcurrent

The most difficult failures are rarely caused by a single catastrophic event.

They are caused by thousands of smaller events that individually appear harmless.

Together, however, they create a hostile electrical environment that the system experiences for years.

Those “gray-zone” events are often responsible for random resets, communication dropouts, and intermittent failures that are extremely difficult to diagnose.

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What Replaces the Schottky Diode Today?

Twenty years ago the answer was simple:

A series diode.

Today?

Most advanced designers are no longer willing to pay the efficiency penalty.

Assume only 0.5V of forward voltage drop.

At 20A:

0.5V × 20A = 10W of heat.

Continuously.

As long as the system is operating.

That is not just wasted power.

It is:

• Heat generation
• Reduced reliability
• Increased cooling requirements
• Lower overall efficiency

As a result, more and more systems are moving toward MOSFET-based Ideal Diode architectures.

This represents a much larger shift.

Input power protection is no longer a single component.

It is becoming a complete subsystem.

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MIL-STD-1275 Is Only the Starting Line

This may be the most important conclusion of all.

Many specifications end with the statement:

“The equipment shall comply with MIL-STD-1275.”

Excellent.

But does that guarantee survival?

Not necessarily.

What about:

• EMI?
• Reverse Battery?
• Inrush Current?
• Ground Shift?
• Cable Inductance?
• Fault Isolation?
• Brownout Recovery?

Compliance with a standard is a baseline requirement.

It is not a protection strategy.

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The Future Belongs to Electronic Power Protection

In a world of mission computers, AI systems, smart sensors, high-speed communications, and autonomous platforms, protecting a 28V bus can no longer rely on a random collection of a breaker, a diode, and a TVS.

More and more systems are adopting a different approach.

Not individual protection components.

But a complete Electronic Power Protection layer that addresses the entire chain of electrical threats transparently.

Because the real question today is no longer:

“Will the system survive the next 100V surge?”

The real question is:

“Will it continue performing its mission after ten years of reverse battery events, brownouts, ripple, EMI, and thousands of small electrical disturbances that never make it into qualification reports?”

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Meet the “Swiss Army Knife” of the 28V Bus

Imagine taking a circuit breaker, a reverse battery protection circuit, a TVS, an EMI filter, and surge protection circuitry—and packaging them into a single compact unit.

You would end up with something very similar to the SPP-F310A family.

The SPP is not a power supply.

It is not a DC/DC converter.

Instead, it sits at the power input of the system and acts as a complete Electronic Power Protection layer.

Rather than relying on multiple discrete components, it combines:

• Reverse Battery Protection
• Current Limiting
• Surge Protection
• Spike Protection
• Conducted Emissions Reduction
• Ripple Attenuation

while maintaining extremely high efficiency and very low insertion loss.

The real magic is not that it survives electrical events.

It is that the equipment behind it can continue operating as if those events never happened.

That is the difference between passing a laboratory test and surviving for years on an operational platform.

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Comparison of Selected Models

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Case Study #1 – Mission Computer in an Armored Vehicle

Challenge

The mission computer is connected directly to the vehicle’s 28V power bus.

During engine starts, battery replacement, or load switching events, the system experiences:

• Spikes
• Brownouts
• Ripple
• Reverse Battery conditions

Any of these can trigger a system reset.

Solution

An SPP module is installed at the power entry point.

It filters and limits disturbances before they reach the critical electronics.

Result

• Fewer random resets
• Fewer field failures
• Higher system availability

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Case Study #2 – INS / IMU Navigation System

Challenge

Modern IMU and INS systems are extremely sensitive to brief voltage interruptions.

Even a short brownout may cause an unexpected restart and disrupt navigation continuity.

Solution

The SPP serves as a front-end protection layer ahead of the main power supply.

Result

Reduced risk of unintended navigation system resets during operation.

Anyone who works with IMUs understands how expensive a reset can be at the wrong moment.

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Case Study #3 – Tactical Communication Station

Challenge

RF and communication equipment often shares the same power bus with motors, pumps, and high-power electrical loads.

This results in:

• Conducted Emissions
• Ripple
• Switching Noise

Solution

The SPP reduces conducted disturbances and provides an additional filtering layer on the power bus.

Result

A cleaner power environment for sensitive communication equipment.

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Case Study #4 – Remote Weapon Station (RWS)

Challenge

The system operates on a platform exposed to vibration, load switching, maintenance errors, and harsh field conditions.

Solution

The SPP combines:

• Reverse Battery Protection
• Current Protection
• Surge Protection
• EMI Filtering

in a single compact package.

Result

• Fewer components
• Fewer failure points
• Simpler integration

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Why We Like This Concept

Not because it replaces a particular component.

But because it replaces a design philosophy.

Instead of asking:

“Which TVS should we choose?”

or

“Which diode should we use?”

Engineers begin asking:

“How do we protect the entire system?”

And that is exactly the mindset increasingly adopted by modern military platforms.

Frequently Asked Questions (FAQ)

Is the SPP a DC/DC Converter?

No.

The SPP is not a power converter and does not change the input voltage.

It is an Electronic Power Protection module installed between the power source and the load to protect the system against a wide range of electrical threats while maintaining extremely low insertion loss.

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Does the SPP replace a Circuit Breaker?

Not always.

In many applications it complements the circuit breaker rather than replacing it.

The breaker primarily protects against overloads and short circuits, while the SPP addresses additional threats such as reverse battery conditions, surges, spikes, ripple, and conducted disturbances.

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Does the SPP replace a TVS?

To a large extent, yes.

The SPP provides a significantly broader protection function than a standalone TVS device.

However, some system architectures may still incorporate additional TVS protection as part of a layered defense strategy.

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Can the SPP eliminate the need for a dedicated Reverse Battery Protection Diode?

In many applications, yes.

One of the major advantages of the SPP is that it provides reverse battery protection without the power losses and heat generation associated with traditional series diodes.

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Can the SPP be installed in front of a MIL-STD-1275 compliant power supply?

Absolutely.

This is one of the most common applications.

The SPP adds an additional protection layer between the vehicle power bus and the power supply, reducing the electrical stress seen by downstream equipment.

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Is the SPP intended only for military systems?

No.

Although originally designed for demanding military environments, the technology is also suitable for:

• Industrial systems
• Transportation platforms
• Communication equipment
• Autonomous vehicles
• Heavy-duty mobile equipment

Any application exposed to a harsh electrical environment can benefit from Electronic Power Protection.

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Does the SPP protect against Reverse Battery events?

Yes.

The unit is designed to withstand reverse polarity conditions without damage and automatically recovers once the correct polarity is restored.

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Does the SPP protect against Load Dump?

Yes.

The SPP family is specifically designed to handle surge, spike, and load dump events associated with military vehicle power systems.

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Does the SPP eliminate Brownouts?

Not completely.

The SPP is not an energy storage device and is not a UPS.

However, it helps stabilize the power bus and prevents many transient disturbances from reaching sensitive electronics.

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Does the SPP solve EMI problems?

Not all of them.

There is no single device that can solve every EMI challenge.

However, the SPP reduces conducted disturbances and improves overall power quality on the input bus.

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Can one SPP protect multiple subsystems?

Yes.

In many applications a single unit can be installed upstream to protect multiple loads, provided the total current and power ratings remain within the unit’s specifications.

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If my equipment already complies with MIL-STD-1275, do I still need an SPP?

That is not necessarily the right question.

A better question is:

Will the system continue operating reliably after years of exposure to reverse battery events, ripple, brownouts, EMI, ground shifts, and inductive switching transients?

MIL-STD-1275 compliance is an excellent starting point.

System survivability engineering begins where compliance testing ends.

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When should engineers consider an Electronic Power Protection solution?

Whenever the cost of failure is high.

Examples include:

• Mission Computers
• IMU / INS Systems
• Communication Equipment
• RF Systems
• Remote Weapon Stations
• EO/IR Cameras
• Autonomous Platforms

In many of these applications, a single unexpected reset in the field can cost far more than the protection system itself.

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Why are more military platforms moving toward Electronic Power Protection?

Because modern military electronics are increasingly sensitive while vehicle power environments are becoming increasingly complex.

The traditional combination of a circuit breaker, a diode, and a TVS may still solve yesterday’s problems.

Electronic Power Protection is designed to address today’s problems – and tomorrow’s.