With the rapid electrification of airport ground support equipment, high-end new energy ground support vehicles (GSE) have become critical for efficient and sustainable airport operations. Their powertrain and high-voltage auxiliary systems, serving as the "heart and energy core" of the vehicle, demand precise, robust, and efficient power conversion and switching for critical loads such as traction motor drives, high-voltage DC-DC converters, and intelligent power distribution units. The selection of power MOSFETs directly determines the system's power density, conversion efficiency, thermal performance, and operational reliability under demanding conditions. Addressing the stringent requirements of airport GSE for high power, safety, longevity, and extreme environment adaptability, 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 & Robustness: For mainstream high-voltage bus systems (e.g., 400V, 600V, 800V), MOSFET voltage ratings must have a significant safety margin (≥50-100%) to withstand voltage transients, regenerative braking spikes, and harsh electrical noise.
Ultra-Low Loss for High Current: Prioritize devices with very low on-state resistance (Rds(on)) and optimized gate charge (Qg) to minimize conduction and switching losses at high current levels, crucial for efficiency and thermal management.
Package for Power & Cooling: Select packages like TO-247, TO-263, TO-220 for high-power paths to facilitate superior heat sinking via chassis or liquid cooling plates, ensuring stable operation under high thermal stress.
Mission-Critical Reliability: Devices must exceed automotive-grade longevity expectations, featuring high junction temperature capability, excellent avalanche energy rating, and robustness against vibration and thermal cycling.
Scenario Adaptation Logic
Based on the core electrical architectures within high-voltage GSE, MOSFET applications are divided into three main scenarios: Traction Inverter & Main Drive (High-Power Core), High-Voltage DC-DC & Auxiliary PSU (Energy Conversion), and Intelligent Load Switching & Distribution (Power Management). Device parameters and packages are matched accordingly to each scenario's voltage, current, and switching frequency demands.
II. MOSFET Selection Solutions by Scenario
Scenario 1: Traction Inverter & Main Drive (High-Power Core) – 600V+ High-Current Platform
Recommended Model: VBP16R64SFD (Single-N, 650V, 42A, TO-220F)
Key Parameter Advantages: Utilizes advanced SJ_Multi-EPI superjunction technology, achieving an exceptionally low Rds(on) of 56mΩ at 10V Vgs. A continuous current rating of 42A (with high pulse capability) meets the phase current requirements for compact traction inverters in 400V-600V systems.
Scenario Adaptation Value: The TO-220F (fully isolated) package allows direct mounting on a common heatsink for multiple devices, simplifying inverter bridge thermal design. Ultra-low conduction loss minimizes heat generation in the power stage, directly contributing to higher system efficiency and extended range. The 650V rating provides ample margin for bus voltage fluctuations.
Applicable Scenarios: High-frequency switching inverter legs for PMSM/BLDC traction motors, supporting high torque density and efficient regenerative braking.
Scenario 2: High-Voltage DC-DC Converter (Isolated) – Primary-Side Switching
Recommended Model: VBM19R05S (Single-N, 900V, 5A, TO-220)
Key Parameter Advantages: Features a very high 900V drain-source voltage rating, ideal for the primary side of isolated DC-DC converters stepping down from ~800V HV battery to lower voltage domains (e.g., 24V, 48V). Rds(on) of 1500mΩ is optimized for the moderate current (5A continuous) in this topology.
Scenario Adaptation Value: The high voltage rating ensures rugged operation and protects against leakage inductance spikes. The TO-220 package offers excellent thermal performance for dissipating losses in a compact converter design. Its parameters are well-suited for hard-switching or soft-switching topologies (e.g., LLC) common in high-power, isolated automotive DC-DC converters.
Applicable Scenarios: Primary-side switch in multi-kilowatt isolated DC-DC converters, battery charger onboard modules (OBC).
Scenario 3: Intelligent High-Current Load Switching & Battery Protection
Recommended Model: VBE1105 (Single-N, 100V, 100A, TO-252 / DPAK)
Key Parameter Advantages: Employs advanced Trench technology, achieving an ultra-low Rds(on) of 5mΩ at 10V Vgs. An extremely high continuous current rating of 100A makes it capable of handling very high continuous currents.
Scenario Adaptation Value: The ultra-low Rds(on) translates to minimal voltage drop and negligible conduction loss, critical for battery disconnect switches, pre-charge circuits, and unswitched power distribution paths. The TO-252 package provides a great balance of current handling, thermal performance, and PCB footprint. It enables efficient and reliable control of high-current auxiliary loads (e.g., electric HVAC compressors, PTC heaters) or serves as a main contactor supplement/solid-state battery protector.
Applicable Scenarios: Main battery contactor support/ replacement, solid-state disconnect switches, high-current auxiliary load drivers, and motor brake circuits.
III. System-Level Design Implementation Points
Drive Circuit Design
VBP16R64SFD: Requires a dedicated high-current gate driver IC with sufficient peak current capability (≥2A-4A) to achieve fast switching and minimize losses. Careful layout to minimize power loop and gate loop inductance is critical.
VBM19R05S: Can be driven by a standard gate driver. Attention must be paid to managing high dv/dt and protecting the gate from noise due to high-voltage switching.
VBE1105: Requires a robust gate driver capable of sourcing/sinking high current to quickly charge/discharge its significant gate capacitance, ensuring fast turn-on/off for protection functions.
Thermal Management Design
Hierarchical Cooling Strategy: VBP16R64SFD and VBM19R05S in TO-220 packages should be mounted on a dedicated heatsink, possibly liquid-cooled for traction inverters. VBE1105 requires a significant PCB copper pour area (or a small heatsink) to dissipate heat at full current.
Derating for Mission Profile: Design for a continuous operating current at 60-70% of the rated value, considering the vehicle's duty cycle and maximum ambient temperature. Maintain a junction temperature safely below the maximum rating under all operating conditions.
EMC and Reliability Assurance
EMI Suppression: Use RC snubbers or parallel ceramic capacitors across the drain-source of switching MOSFETs (VBP16R64SFD, VBM19R05S) to control voltage ringing and reduce EMI. Employ proper shielding for high-di/dt paths.
Protection Measures: Implement comprehensive overcurrent, overtemperature, and short-circuit protection at the system level. Use gate clamping TVS diodes and series resistors for all MOSFETs to protect against voltage surges and ensure stable operation in the electrically noisy vehicle environment.
IV. Core Value of the Solution and Optimization Suggestions
The power MOSFET selection solution for high-end new energy airport GSE proposed in this article, based on scenario adaptation logic, achieves comprehensive coverage from the high-power traction drive to high-voltage conversion and intelligent power distribution. Its core value is mainly reflected in the following three aspects:
1. High-Efficiency Powertrain and Energy Management: By selecting optimized MOSFETs for each key node—from the low-loss SJ MOSFET in the traction inverter to the ultra-low Rds(on) device for power distribution—system-wide losses are minimized. This contributes directly to higher overall vehicle efficiency, extended operational range per charge, and reduced thermal load on the cooling system, enhancing component lifespan.
2. Robustness for Safety-Critical and Demanding Operations: The selected devices feature high voltage ratings, robust packages (TO-220F, TO-247), and technology (SJ_Multi-EPI) suited for the high-stress, high-reliability demands of airport GSE. This ensures stable 24/7 operation under varying loads, temperatures, and electrical disturbances, which is paramount for airport ground operations' safety and punctuality.
3. Scalability and Cost-Effectiveness for Diverse Platforms: The solution leverages a mix of established, high-volume package types and technologies, offering a reliable and cost-effective BOM. This scalability allows it to be adapted across different GSE platforms (tugs, loaders, buses) with varying power levels. The balance between performance, reliability, and cost is ideal for the commercial vehicle sector.
In the design of the high-voltage power systems for new energy airport ground support vehicles, power MOSFET selection is a cornerstone for achieving high power density, efficiency, robustness, and intelligence. The scenario-based selection solution proposed in this article, by accurately matching the stringent requirements of different high-voltage subsystems and combining it with rigorous system-level drive, thermal, and protection design, provides a comprehensive, actionable technical reference for GSE development. As airport electrification advances towards higher system voltages, higher power densities, and increased automation, the selection of power devices will place greater emphasis on integration with wide-bandgap semiconductors (like SiC for ultra-high efficiency) and smart power modules. Future exploration should focus on the application of SiC MOSFETs for the highest efficiency demands and the development of intelligent gate drivers with integrated diagnostics, laying a solid hardware foundation for creating the next generation of zero-emission, high-uptime, and smart-connected airport ground support vehicles. In the era of sustainable aviation, superior and reliable high-voltage hardware design is the critical enabler for efficient and green airport operations.

Detailed Scenario Topology Diagrams