In the context of developing low-altitude tourism and emergency mobility networks, high-end scenic area eVTOL (Electric Vertical Take-Off and Landing) operations demand power systems characterized by exceptional reliability, high power density, and intelligent control. The power conversion and distribution units – encompassing battery management, motor drive auxiliaries, avionics power, and ground support charging – serve as the vehicle's and infrastructure's "power backbone." Their performance is critical for safe, quiet, and efficient flight experiences in diverse environmental conditions. The selection of power MOSFETs directly impacts system weight, thermal performance, efficiency, and operational safety. This article, targeting the demanding application scenario of scenic eVTOLs—with stringent requirements for weight, efficiency, reliability, and operation in variable temperatures—conducts an in-depth analysis of MOSFET selection for key power nodes, providing an optimized device recommendation scheme.
Detailed MOSFET Selection Analysis
1. VBM16R10S (N-MOS, 600V, 10A, TO-220)
Role: Main switch for onboard high-voltage auxiliary power conversion or compact ground charging module PFC stage.
Technical Deep Dive:
Voltage Robustness & Topology Fit: The 600V rating is ideally suited for systems operating from 400V-500V DC battery buses or after rectification of 3-phase 400VAC ground power. Its Super Junction (SJ_Multi-EPI) technology offers an excellent balance of low Rds(on) (450mΩ) and high voltage capability. This makes it perfect for critical yet space/weight-conscious applications like an onboard high-voltage to low-voltage DC-DC converter (HV-LV DCDC) for avionics and servo systems, or as a robust switch in a lightweight, air-cooled ground support charger's power factor correction stage.
Efficiency & Thermal Management: The TO-220 package provides a robust thermal path for a single switch or small parallel configuration. The relatively low Rds(on) minimizes conduction losses, contributing to longer flight endurance or lower cooling demands. Its suitability for frequencies up to several tens of kHz allows for magnetics optimization, aiding in achieving high power-to-weight ratios essential for aviation.
2. VBGM1105 (N-MOS, 100V, 110A, TO-220)
Role: Primary switch for high-current battery disconnect (contactor replacement), motor pre-charge circuits, or high-power low-voltage DC-DC conversion.
Extended Application Analysis:
Ultra-Low Loss Power Handling Core: With a remarkably low Rds(on) of 5.2mΩ and a continuous current rating of 110A, this SGT (Shielded Gate Trench) MOSFET is engineered for minimizing losses in high-current paths. It can serve as a solid-state main battery contactor, significantly reducing weight and enabling ultra-fast, arc-free switching compared to electromechanical relays. This enhances safety and allows for intelligent in-rush current management.
Power Density & System Integration: The 100V rating provides a safe margin for 48V or 72V vehicle auxiliary systems or the low-voltage side of traction battery management. Its high current capability in the standard TO-220 package allows for extremely compact and lightweight design of power distribution units (PDUs). When used in synchronous buck/boost converters for LV systems, its efficiency directly translates to less waste heat, reducing cooling system weight and complexity—a paramount concern in eVTOL design.
3. VBA2412 (P-MOS, -40V, -16.1A, SOP8)
Role: Intelligent load switching for avionics, sensors, lighting, and cabin management systems.
Precision Power & Safety Management:
High-Density Intelligent Load Control: This P-channel MOSFET in a compact SOP8 package features a low Rds(on) of 10mΩ @10V and a -40V drain-source rating, making it ideal for robust 12V/24V aircraft electrical systems. Its P-channel configuration simplifies high-side switching, as it can be driven directly from a microcontroller with a simple level shifter or charge pump, eliminating the need for a separate high-side driver IC. This is perfect for centrally controlling multiple non-propulsion loads like lidar, cameras, communication radios, and cabin amenities.
Reliability & System Diagnostics: The low threshold voltage (Vth: -2V) ensures reliable turn-on even with slightly sagged rail voltages. Its compact size allows for dense placement on a central load management board, enabling individual fuse-less electronic switching, current monitoring, and fault isolation for each subsystem. This facilitates predictive maintenance, quick fault diagnosis, and enhances overall system safety and availability during frequent tourist flight cycles.
System-Level Design and Application Recommendations
Drive Circuit Design Key Points:
High-Voltage Switch Drive (VBM16R10S): Requires a standard gate driver with adequate current capability. Attention should be paid to managing switch-node dv/dt and layout to minimize EMI, which is critical in sensitive avionic environments.
High-Current Switch Drive (VBGM1105): Demands a driver with strong sink/source capability (several Amps) to rapidly charge/discharge its higher gate capacitance, ensuring minimal switching losses. The power loop inductance must be absolutely minimized using a star-point or laminated busbar approach to contain voltage spikes during turn-off.
Intelligent Load Switch (VBA2412): Can be driven directly via an MCU GPIO with a small series resistor and optional gate pull-down. Implementing RC filtering at the gate is advised to prevent false triggering from noise. Each switch should be accompanied by a current sense circuit for load health monitoring.
Thermal Management and EMC Design:
Weight-Optimized Thermal Design: VBM16R10S and VBGM1105 will require attachment to a thermally conductive structure or a lightweight, forced-air cooled heatsink. VBA2412 can dissipate heat effectively through a connected PCB copper plane.
Aviation-Grade EMI Suppression: Employ snubbers across VBM16R10S in high-voltage switching circuits. Use low-ESR ceramic capacitors very close to the drain-source of VBGM1105. Maintain strict segregation of high-power and sensitive signal routes, using shielding and ferrites as necessary to meet rigorous DO-160 or similar standards for airborne equipment.
Reliability Enhancement Measures:
Conservative Derating: Operate VBM16R10S at ≤80% of its rated voltage. For VBGM1105, ensure junction temperature remains well below its maximum under all conceivable load and ambient conditions (-40°C to +85°C operational range).
Redundant Protection: Implement hardware overcurrent protection (e.g., desaturation detection for VBGM1105) independent of the software. For loads switched by VBA2412, integrate redundant current sensing and fast shutdown paths.
Environmental Hardening: Conformal coating of PCBs is recommended to protect against condensation and contaminants. All selected packages offer good reliability for the vibration and thermal cycling profiles expected in eVTOL operations.
Conclusion
In designing power systems for high-end scenic eVTOLs, where weight, reliability, and intelligent management are non-negotiable, strategic MOSFET selection is foundational. The three-tier MOSFET scheme—comprising the high-voltage robust switch (VBM16R10S), the ultra-efficient high-current handler (VBGM1105), and the intelligent load manager (VBA2412)—embodies the design principles of high power density, operational safety, and system intelligence.
Core value is reflected in:
Optimized Power-to-Weight Ratio: The combination of low-loss high-current handling and compact load switching creates an efficient and lightweight electrical power system, directly contributing to increased payload capacity or flight range.
Enhanced Operational Safety & Availability: Intelligent, solid-state load control with monitoring enables proactive system health management, rapid fault isolation, and graceful degradation, which is crucial for maintaining tight flight schedules and ensuring passenger safety.
Environmental Resilience: The selected devices, combined with robust system design, ensure stable operation amidst the temperature, humidity, and vibration challenges posed by high-frequency tourist operations in varying scenic landscapes.
Future-Oriented Scalability: This modular approach allows for scaling the number of channels for load management (VBA2412) or paralleling power stages (VBGM1105) to adapt to larger eVTOL designs or more power-hungry sensor suites.
Future Trends:
As eVTOLs evolve towards higher voltage propulsion systems (800V+) and more autonomous operations, power device selection will trend towards:
Adoption of SiC MOSFETs in the main propulsion inverter and high-power charging interfaces for ultimate efficiency and weight reduction.
Integration of more intelligent power switches with built-in diagnostics and communication (e.g., PMBus) for advanced health monitoring.
Use of GaN devices in high-frequency RF and lidar power supplies, where extreme power density is required.
This recommended scheme provides a foundational power device solution for scenic eVTOL applications, spanning from high-power distribution to intelligent low-power load management. Engineers can refine selections based on specific voltage levels, required fault tolerance levels, and the vehicle's unique mission profile to build the reliable and high-performance electrical systems that will define the future of low-altitude tourism.

Detailed Power Stage Topologies