Fanless Thermal Envelopes and Power Efficiency in Harsh Roadside Gantries
Designing ruggedized compute modules operating reliably from -40°C to +85°C without forced air cooling.
Power & Thermal Management Architecture & Design
Thermal and power architecture for fanless roadside compute modules, covering heat-spreader sizing, enclosure IP67 sealing, and power budget allocation between compute, radio, and sensor subsystems under a fixed gantry power envelope.
Production Implementation & Verification
Environmental qualification results from -40°C cold-chamber starts through +85°C sustained highway-median deployments, including long-term power-supply derating curves and condensation ingress testing.
- Passive heat-spreader enclosures dissipate up to 45 W of SoC thermal design power without forced-air cooling in direct sunlight.
- Dynamic voltage and frequency scaling throttles NPU clocks predictably to hold junction temperature below 105°C during Phoenix-summer field trials.
- Conformally coated power modules survive condensation and salt-fog exposure per IEC 60068 while sustained at -40°C cold start.
- Redundant PoE++ power feeds sustain roadside compute nodes through single-feed loss without service interruption.
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