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Mil Std 1275D Wide Input Range Multi-Phase Power Supply
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This highly efficient Power Supply provides low-noise power over a wide range of input voltages and output load conditions. The system is designed and tested to meet the stringent Military Standard 1275D transient and noise requirements for 28V military ground vehicles.
The system is designed to operate down to 11V for use in standard civilian vehicles.
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System
Overview
The supply consists of:
- Military Standard 1275D input filter and protection
network capable of withstanding and operating during
+100V 100mS transients, +250V 100uS transients and
withstanding indefinite input reversals.
- System Fan Supply: 12V to 24V output at up to 1 Amp.
- Low-noise RF Supply: 8V at up to 2 Amps.
- Main Supply: 5V at up to 24 Amps using multi-phase
load-shedding architecture.
- PLD (Programmable Logic Device) that implements
non-overlapping sync waveforms, load-shedding control
and sequencing.
The system operates over a wide 11V to 38V
steady-state input voltage. All supplies are frequency
synchronizable to an external signal source to minimize
radio artifacts. The main supply operates at greater
than 90% efficiency over the full input voltage range
and output current range, including the losses in the
1275D protection and anti-reversal circuitry.
Project Scope
Bolton Engineering worked with the client to create a
specification, designed the schematics and circuit
board, simulated the power stages and control loops,
wrote Verilog PLD code, fabricated and debugged the
hardware, and delivered 20 working prototypes. The
first-pass boards met all customer electrical,
mechanical and thermal requirements, requiring only
minor electrical changes before being production-ready. |
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Consumer and Computer
