With the rapid development of urban air mobility and automated logistics, low-altitude logistics dispatch platforms have become critical infrastructure for future transportation. Their power conversion systems, serving as the "core of energy and propulsion," need to provide highly efficient, reliable, and dense power conversion for critical loads such as ground charging piles, drone propulsion systems, and communication/navigation units. The selection of power MOSFETs directly determines the system's conversion efficiency, power density, thermal performance, and operational reliability. Addressing the stringent requirements of dispatch platforms for high power, high reliability, and continuous operation, this article centers on scenario-based adaptation to reconstruct the power MOSFET selection logic, providing an optimized solution ready for direct implementation.
I. Core Selection Principles and Scenario Adaptation Logic
Core Selection Principles
High Voltage & Power Handling: For ground charging infrastructure (AC-DC, DC-DC) and high-voltage drone powertrains, MOSFETs must have sufficient voltage ratings (e.g., 600V, 800V) and current capability to handle high-power conversion and regenerative braking events.
Ultra-High Efficiency Priority: Prioritize devices with extremely low on-state resistance (Rds(on)) and optimized gate charge (Qg) to minimize conduction and switching losses, maximizing overall system efficiency and flight time/range.
Robustness & Reliability: Components must meet requirements for harsh environments, high vibration, and 24/7 operation. Superior thermal performance and strong avalanche energy rating are crucial.
Package & Integration: Select packages (TO-220F, TO-252, TOLT) that balance high-power dissipation, creepage distance, and assembly robustness for both ground-based and airborne applications.
Scenario Adaptation Logic
Based on the core power chain within the logistics platform, MOSFET applications are divided into three main scenarios: Ground Charging Infrastructure (High-Power Conversion), Drone Propulsion & Powertrain (High-Efficiency Drive), and Auxiliary Power Distribution (Management & Control). Device parameters and technologies are matched accordingly.
II. MOSFET Selection Solutions by Scenario
Scenario 1: Ground Charging Infrastructure PFC/DC-DC Stage – High-Power Conversion Device
Recommended Model: VBE18R11S (N-MOS, 800V, 11A, TO-252)
Key Parameter Advantages: Utilizes SJ_Multi-EPI (Super Junction) technology, achieving a robust 800V drain-source voltage rating with an Rds(on) of 380mΩ. This provides ample margin for 400V-600V DC bus systems common in fast chargers.
Scenario Adaptation Value: The 800V rating ensures resilience against grid surges and switching voltage spikes in PFC and LLC resonant converter topologies. The TO-252 package offers a good balance of power handling and footprint, suitable for high-density charger designs. Its SJ technology ensures low switching loss at high frequencies, improving power density.
Scenario 2: Drone Propulsion System & High-Current DC-DC – High-Efficiency Drive Device
Recommended Model: VBGQTA11505 (N-MOS, 150V, 150A, TOLT-16)
Key Parameter Advantages: Features SGT (Shielded Gate Trench) technology, delivering an ultra-low Rds(on) of 6.2mΩ at 10V Vgs. The extremely high continuous current rating of 150A meets the demands of high-power multi-rotor or VTOL aircraft motor drives and high-current synchronous rectification stages.
Scenario Adaptation Value: The ultra-low Rds(on) minimizes conduction losses in motor inverter bridges and DC-DC converters, directly enhancing overall efficiency and extending drone flight time. The TOLT-16 package is designed for low parasitic inductance and excellent thermal performance, critical for high-frequency switching in compact airborne electronics.
Scenario 3: Auxiliary Power Distribution & Medium-Power Conversion – Management & Control Device
Recommended Model: VBMB16R15SFD (N-MOS, 600V, 15A, TO-220F Full Pak)
Key Parameter Advantages: Employs SJ_Multi-EPI technology, offering a balanced performance with 600V Vds, 15A Id, and 240mΩ Rds(on). The fully isolated TO-220F package enhances safety and simplifies thermal interface design.
Scenario Adaptation Value: The 600V rating is ideal for DC-link switching, auxiliary power supply flyback/forward converters, and ground station power distribution. The full isolation allows for easy mounting on a shared heatsink without insulation pads, improving thermal management and system reliability for always-on ground equipment.
III. System-Level Design Implementation Points
Drive Circuit Design
VBGQTA11505: Requires a dedicated high-current gate driver IC to ensure fast switching and prevent shoot-through. Careful PCB layout minimizing power loop inductance is paramount.
VBE18R11S & VBMB16R15SFD: Use appropriate isolated or level-shifted gate drivers. Incorporate negative voltage turn-off capability for SJ MOSFETs in bridge topologies to improve noise immunity and reliability.
Thermal Management Design
Graded Heat Dissipation Strategy: VBMB16R15SFD and VBE18R11S benefit from chassis-mounted heatsinks. VBGQTA11505 requires a significant PCB copper plane or a dedicated bonded heatsink due to its extremely high current.
Derating for Harsh Conditions: Apply significant derating (e.g., 50-60% of rated current) for continuous operation in high ambient temperatures (e.g., +70°C+ inside enclosures). Prioritize junction temperature monitoring or estimation.
EMC and Reliability Assurance
Snubber & Filtering: Implement RC snubbers across primary-side MOSFETs (VBE18R11S) to dampen high-frequency ringing. Use input/output filters to meet strict aviation/ground EMC standards.
Protection Measures: Incorporate comprehensive over-current, over-voltage, and over-temperature protection at the system level. Use TVS diodes on gate pins and bus voltages for surge protection. Ensure proper creepage and clearance distances for high-voltage nodes.
IV. Core Value of the Solution and Optimization Suggestions
The power MOSFET selection solution for low-altitude logistics platforms, based on scenario adaptation logic, achieves coverage from megawatt-hour ground energy conversion to kilowatt-level airborne propulsion. Its core value is mainly reflected in the following aspects:
System-Wide Efficiency Maximization: By selecting SJ and SGT technology-based MOSFETs for different voltage and power tiers, switching and conduction losses are minimized across the entire energy chain—from grid-to-vehicle charging to thrust generation. This translates to lower operational costs for ground stations and maximized payload-range for drones.
Balancing High Reliability with Power Density: The selected devices, such as the 800V SJ MOSFET and the fully isolated package option, provide inherent robustness against electrical stress and ease thermal design. This balance is crucial for both maintenance-free ground infrastructure and safety-critical airborne systems, ensuring maximum uptime for the logistics network.
Future-Proofing for Evolving Architectures: As platform voltages increase (e.g., to 800V or higher for faster charging and lighter cabling) and propulsion systems become more powerful, the chosen technologies (SJ, SGT) and voltage classes (150V, 600V, 800V) provide a scalable foundation. This prepares the hardware platform for next-generation, higher-capacity logistics drones and charging standards.
In the design of power systems for low-altitude logistics dispatch platforms, power semiconductor selection is a cornerstone for achieving efficiency, reliability, and scalability. This scenario-based selection solution, by accurately matching the distinct demands of ground power conversion, airborne propulsion, and auxiliary management—combined with robust system-level design practices—delivers a comprehensive, actionable technical roadmap. Future exploration should focus on the integration of wide-bandgap devices (like SiC MOSFETs for the highest power stages) and advanced module packaging, laying a solid hardware foundation for building the next generation of efficient, reliable, and dominant low-altitude logistics networks.

Detailed Scenario Topology Diagrams