Fault-tolerant airborne AC-DC & DC-DC power conversion architectures featuring active current sharing, hot-swappable module redundancy, and sub-microsecond isolation for mission-critical flight avionics.
Ultra-compact conduction-cooled designs operating flawlessly from -55°C to +85°C and altitudes exceeding 70,000 feet with active ideal ORing isolation.
Designed for 115V/230V 400Hz AC inputs and 28V/270V DC buses with integrated active PFC, sub-harmonic suppression, and zero-drop transition.
In high-altitude defense programs, autonomous unmanned aerial systems (UAVs), commercial airliners, and tactical airborne radar platforms, power failure is not an option. An Aerospace Redundant N+1 Power Supply is an advanced electrical architecture engineered to eliminate single points of failure by pairing 'N' power modules required to meet total system load demands with '1' additional active spare unit. If any individual module suffers a thermal event, component failure, or line fault, the remaining modules immediately sustain full operational current with zero voltage interruption.
Modern airborne systems—ranging from active electronically scanned array (AESA) radar racks to flight control computers and satellite communication suites—demand unprecedented levels of continuous power density. Traditional 1+1 dual-redundant architectures duplicate 100% of system hardware, imposing unacceptable weight, volume, and thermal penalties on modern airframes.
By contrast, an optimized Aerospace Redundant N+1 Power Supply uses a modular parallel approach. By utilizing three 500W modules to support a 1000W load (a 2+1 configuration), systems engineers reduce physical footprint and weight by up to 33% compared to dual 1000W units while maintaining absolute fault tolerance.
Designing an Aerospace Redundant N+1 Power Supply requires far more than connecting standard power supplies in parallel. It demands precise high-frequency control loops, ultra-fast fault isolation, and specialized thermal management to survive extreme environmental stresses.
Passive droop current sharing relies on output voltage drops to balance current between parallel supplies, resulting in poor line regulation (often degraded by ±5%). AJ's Power Source implements high-speed Active Single-Wire Current Sharing control logic.
An internal high-side current sensing amplifier monitors each module's contribution and continuously micro-adjusts the PWM feedback loop. This guarantees balanced output current down to load levels as low as 10%, keeping junction temperatures identical across all power devices and extending overall operational life.
Legacy redundant power supplies used passive Schottky ORing diodes to isolate parallel rails. However, Schottky diodes introduce significant forward voltage drops (0.5V to 0.8V), generating excessive waste heat at 100A+ current output.
Our aerospace N+1 platforms replace passive diodes with N-Channel Active Ideal ORing FETs controlled by high-speed sensing ICs. During an internal module short, the reverse current is detected within less than 200 nanoseconds, driving the gate voltage low and turning off the switch to prevent downstream voltage degradation on the main avionics bus.
Integrating Gallium Nitride (GaN) switches and Silicon Carbide (SiC) diodes allows switching frequencies to scale from 100kHz up to 500kHz+. Higher switching speeds significantly shrink the footprint of planar transformers and output inductor chokes.
This wide bandgap efficiency breakthrough yields power densities exceeding 35 Watts per cubic inch while operating cleanly across altitude profiles up to 70,000 feet without dielectric arc-over or thermal runaway.
| Design Parameter | Legacy Dual Redundant (1+1) | AJPS Aerospace Redundant (N+1) | Operational Advantage |
|---|---|---|---|
| Volumetric Power Density | 10 – 15 Watts / in³ | 30 – 45 Watts / in³ | 3x space savings in constrained avionics bays |
| System Efficiency (Full Load) | 84% – 88% (Diode ORing) | 94% – 96% (Active Ideal ORing) | Dramatically lower heat dissipation in sealed cockpits |
| Current Balancing Accuracy | ±8% to ±12% (Passive Droop) | ±2% to ±4% (Active Bus Controller) | Eliminates localized thermal hotspots, boosting MTBF |
| Module Fault Isolation Speed | 10 to 50 Microseconds | < 200 Nanoseconds | Prevents output voltage dip during module failure |
| Input Frequency Range | 400Hz Fixed (±5%) | 360Hz – 800Hz Wild Frequency | Fully compatible with modern variable frequency aircraft generators |
| Thermal Dissipation Path | Forced Air Fans (High Failure Risk) | Conduction Cold-Plate / Potted Baseplate | Maintenance-free cooling for high-altitude unpressurized compartments |
Select from proven COTS platforms, modified standard configurations, or custom-engineered enclosures developed for defense primes and aerospace OEMs worldwide.
Configurable 19-inch rackmount or custom chassis featuring 3x 1200W hot-swappable modules (2+1 2400W redundant output). Accepts 115/230VAC 400Hz input with active PFC.
Conduction-cooled, sealed aluminum chassis designed for unpressurized UAV weapon bays and mast applications. Delivers 28VDC or 270VDC redundant power with zero fan dependency.
High-density converter system for next-generation military aircraft architectures. Transforms 270VDC high-voltage bus power into regulated 28VDC redundant output with sub-microsecond trip limits.
As aerospace defense programs transition toward More Electric Aircraft (MEA), hybrid-electric VTOL aircraft, and high-altitude long-endurance (HALE) unmanned platforms, procurement officers and engineering directors must account for evolving technical and supply chain requirements.
Every Aerospace Redundant N+1 Power Supply designed by AJ's Power Source undergoes rigorous verification to satisfy the most stringent defense and commercial flight standards.
| Standard | Scope & Description | AJPS Engineering Compliance Method |
|---|---|---|
| MIL-STD-704 (A through F) | Aircraft Electrical Power Characteristics (115V/230V 400Hz, 28VDC, 270VDC) | Active PFC front-end circuits sustain zero drop during input interrupts up to 50ms and transient spikes up to 80V. |
| RTCA / DO-160G | Environmental Conditions and Test Procedures for Airborne Equipment | Qualified across Section 4 (Temp/Alt up to 70k ft), Section 8 (Vibration), Section 16 (Power Input), and Section 22 (Lightning Transients). |
| MIL-STD-461 (E, F, G) | Electromagnetic Interference Emission and Susceptibility Requirements | Integrated multi-stage differential and common-mode passive filters ensure compliance with CE102, CS101, RE102, and RS103 limits. |
| MIL-STD-810 (F, G, H) | Environmental Engineering Considerations and Laboratory Tests | Fully potted encapsulated assemblies or ruggedized structural ribs withstand extreme shock (Method 516.8) and salt fog (Method 509.7). |
AJ's Power Source, Inc. (AJPS) is a Veteran-Owned Small Business (VOSB), CAGE code 0P327, located in Land O' Lakes, Florida. Since 1987, we have specialized in the design, qualification, and USA manufacturing of high-reliability power systems for defense primes, government agencies, and aerospace integrators.
Our senior electrical and mechanical engineering staff holds over a century of combined power conversion design expertise.
Small business agility paired with full compliance with FAR, DFARS, ITAR, and domestic sourcing mandates.
Solid-state conduction cooling designs eliminate moving fans, providing MTBF ratings exceeding 150,000 hours.
Dedicated first-article assembly line ensures prototype delivery within aggressive program milestone deadlines.
Answers to key technical inquiries submitted by aerospace procurement specialists, system architects, and electrical engineers.
Contact our senior power design team in Land O' Lakes, Florida to discuss your input transient profile, physical envelope limits, active current sharing specs, or MIL-STD compliance matrix.
Direct Engineering Line: +1 (813) 996-2583 | CAGE Code 0P327
