As the advanced air mobility (AAM) ecosystem evolves, vertiport ground support and charging infrastructure are no longer simple utility stations. They are the core determinants of operational throughput, energy efficiency, and safety certification. A well-designed power chain is the physical foundation for these facilities to handle megawatt-level peak demands during simultaneous electric vertical take-off and landing (eVTOL) charging, ensure flawless operation of heavy-duty ground support equipment (GSE), and maintain 24/7 reliability under variable environmental conditions.
Building such a chain presents extreme challenges: How to manage microsecond-scale transient currents during GSE motor start-up and charging contactor engagement? How to ensure the longevity of power semiconductors in environments with wide temperature swings, humidity, and potential vibration? How to integrate ultra-fast safety protection, predictive health monitoring, and seamless grid interaction? The answers lie within every engineering detail, from the selection of ruggedized components to system-level integration for aerospace-grade demands.
I. Three Dimensions for Core Power Component Selection: Coordinated Consideration of Voltage, Current, and Topology
1. Ground Support Equipment (GSE) Motor Drive MOSFET: The Core of Instantaneous Torque
The key device is the VBN1806 (80V/85A/TO-262, Single N-Channel), whose selection is critical for high-cycleduty operations like tug drives and lift actuators.
Voltage & Current Stress Analysis: For 48V or lower voltage GSE systems, the 80V VDS provides ample margin for inductive kickback from motor windings. The extremely low RDS(on) of 6mΩ (at 10V VGS) is paramount. For a typical 30A continuous/80A peak motor drive, conduction loss (P_cond = I² RDS(on)) is minimized, directly translating to cooler operation and higher efficiency. The 85A continuous current rating ensures robust handling of stall currents without derating.
Dynamic Response & Ruggedness: The Trench technology enables fast switching, crucial for torque response. The TO-262 package offers a superior balance of power handling and footprint, suitable for dense motor controller designs. Its mechanical robustness is essential for GSE subjected to constant movement and shock.
Thermal Design Relevance: The low RDS(on) inherently reduces heat generation. Effective heatsinking on the metal tab is required to manage heat during peak load cycles, ensuring junction temperature remains within safe limits during rapid succession operations.
2. High-Voltage DC Distribution & Fast-Charging Interface MOSFET: The Backbone of Energy Transfer
The key device selected is the VBP18R35S (800V/35A/TO-247, Single N-Channel SJ_Multi-EPI), essential for managing the high-voltage DC bus from the grid/energy storage to the eVTOL charging port.
Efficiency and Voltage Stiffness: For 800V-class charging infrastructure, the 800V VDS rating is a direct match, providing a safe operating window. The Super Junction Multi-EPI technology offers an excellent trade-off between low specific on-resistance (110mΩ at 10V GS) and high voltage capability. This minimizes conduction loss in the main DC distribution path and contactor pre-charge circuits, maintaining "voltage stiffness" at the charging head.
Transient and Safety Criticality: The TO-247 package allows for high-power dissipation and easy integration with liquid-cooled heatsinks for continuous high-current transfer. Its high VGS rating (±30V) offers noise immunity in high-power environments. This device must be paired with ultra-fast gate drivers and protection circuits to safely interrupt fault currents in the charging loop, where safety is non-negotiable.
System Integration Point: It serves as the ideal candidate for solid-state DC circuit breakers or main DC bus switches within the charging station, enabling faster and more reliable switching than electromechanical counterparts.
3. Auxiliary & Control Power Management MOSFET: The Enabler of High-Density Control
The key device is the VBB1630 (60V/5.5A/SOT23-3, Single N-Channel), enabling miniaturized and highly reliable control functions.
Intelligent Load Management Logic: Used in arrays to control auxiliary systems: precision environmental control (HVAC) for waiting areas and critical electronics, intelligent lighting systems for the vertipad, and communication/telemetry racks. Its low threshold voltage (Vth 1.7V) allows for direct drive from low-voltage logic (3.3V/5V) microcontrollers, simplifying design.
PCB Layout and Power Density: The SOT23-3 package is the cornerstone of high-density power management on vertiport control unit PCBs. Its remarkably low RDS(on) (30mΩ at 10V) for its size ensures minimal voltage drop when switching several amps. Heat is managed through advanced PCB thermal design—thermal vias and large copper pours connected to the system chassis.
Reliability in Distributed Systems: This device's robustness allows it to be deployed in distributed I/O modules across the vertiport, controlling fans, sensors, and indicators reliably, reducing the need for bulky wiring harnesses.
II. System Integration Engineering Implementation
1. Multi-Domain Thermal Management Architecture
A three-level cooling system is imperative.
Level 1: Liquid Cooling targets the VBP18R35S in the main DC charging path and the banks of VBN1806 in high-power GSE drives. Cold plates ensure temperature stability during MW-level charge sessions.
Level 2: Forced Air Cooling with Redundancy targets AC-DC rectifier stages, DC-DC converters for auxiliary power, and control cabinet electronics. N+1 fan configurations ensure cooling continuity.
Level 3: Conduction Cooling via Chassis targets distributed control MOSFETs like the VBB1630, relying on the PCB-to-metal enclosure thermal path for heat dissipation.
2. Electromagnetic Compatibility (EMC) and Ultra-High Voltage Safety Design
Conducted & Radiated EMI Suppression: Employ input filters meeting MIL-STD-461 standards. Use shielded conduits for all high-power DC cabling. Implement spread-spectrum clocking for switch-mode power supplies.
Safety and Fault Isolation: Designs must target aerospace-grade reliability levels. Implement galvanic isolation for all control signals interfacing with high-voltage sections. Use VBP18R35S in actively monitored crowbar circuits for overvoltage protection. Redundant insulation monitoring devices (IMD) continuously check the integrity of the HV system.
3. Reliability Enhancement for 24/7 Operations
Electrical Stress Protection: Sophisticated snubber networks across VBP18R35S switches to clamp voltage spikes from long cable inductances. TVS diodes on all gate drives.
Predictive Health Monitoring (PHM): Implement real-time monitoring of MOSFET RDS(on) drift for VBN1806 and VBP18R35S as a precursor to failure. Monitor thermal cycles on key components to predict solder joint fatigue.
III. Performance Verification and Testing Protocol
1. Key Test Items and Standards
Transient Load Response Test: Validate the system's response to simulated simultaneous eVTOL charging start-up and GSE operation, focusing on voltage dip and recovery.
Environmental Stress Screening (ESS): Perform thermal cycling (-40°C to +85°C) and humidity testing per DO-160 or similar standards.
Vibration and Shock Test: Apply relevant profiles for ground support equipment and fixed infrastructure.
Electromagnetic Compatibility Test: Must exceed typical industrial standards, targeting aerospace/defense levels (MIL-STD-461, RTCA DO-160).
Endurance and Duty Cycle Test: Simulate years of vertiport operation cycles on a test bench, focusing on contactor/switch lifetime and capacitor aging.
2. Design Verification Example
Test data from a vertiport charging module (1000VDC bus, 300kW peak) and GSE drive (48V system) shows:
DC Distribution efficiency (including VBP18R35S conduction loss) exceeded 99.5% at full load.
GSE motor driver (using VBN1806) achieved peak efficiency of 98.8%, with MOSFET case temperature staying below 70°C during peak torque simulation.
Auxiliary control board with VBB1630 arrays operated flawlessly during conducted RF immunity testing.
IV. Solution Scalability
1. Adjustments for Different Vertiport Tiers
Metropolitan Mega-Vertiport: Utilizes the full-scale solution with multiple parallel VBP18R35S devices for multi-MW charging farms and numerous VBN1806 in automated GSE.
Urban or Rooftop Vertiport: May use a scaled-down version. The VBP18R35S is still key for the 800V+ charging link, while GSE might use fewer drives.
Emergency or Mobile Vertiport: Focus on compactness and robustness; the high efficiency of VBN1806 and VBB1630 maximizes runtime from onboard generators or batteries.
2. Integration of Cutting-Edge Technologies
Wide Bandgap (SiC/GaN) Roadmap:
Phase 1 (Foundation): The current solution using high-performance SJ MOSFETs (VBP18R35S) and Trench MOSFETs (VBN1806) offers proven reliability.
Phase 2 (Evolution): Introduce SiC MOSFETs for the main DC distribution and charging switches to reduce losses by ~50% at high frequencies, enabling smaller filters and magnetics.
Phase 3 (Transformation): Adopt GaN HEMTs for auxiliary power and high-frequency DC-DC converters within the system, pushing power density to new limits.
Digital Twin & AI-Driven PHM: Create a live digital twin of the vertiport power chain. Use AI to analyze operational data from devices like VBP18R35S and VBN1806, predicting maintenance needs and optimizing load scheduling to extend component life and prevent downtime.
Conclusion
The power chain design for a high-end vertiport is a mission-critical systems engineering task, balancing extreme power density, nanosecond-scale reliability, aerospace-grade environmental hardening, and total cost of ownership. The tiered optimization scheme proposed—prioritizing ultra-low loss and high current at the GSE level, focusing on high-voltage blocking and robust switching at the distribution level, and achieving ultra-high density at the control level—provides a clear implementation path for vertiports of various scales.
As AAM matures, vertiport power management will evolve towards fully autonomous, grid-interactive microgrids. It is recommended that engineers adhere to the most stringent aerospace and automotive-grade design standards while using this framework, and strategically plan for the integration of Wide Bandgap semiconductors and AI-driven health management.
Ultimately, an exceptional vertiport power design is invisible. It does not directly interact with passengers or pilots, yet it creates the foundational reliability and efficiency that makes rapid, safe, and scalable urban air transportation a reality. This is the true value of engineering precision in launching the third dimension of urban mobility.

Detailed Topology Diagrams