In the context of advancing low-altitude economy and three-dimensional mobility, hybrid road-air integrated flying cars require robust electrical energy conversion systems to ensure efficient propulsion, battery management, and auxiliary control. The performance of these systems hinges on the selection of power MOSFETs, which impact power density, efficiency, thermal handling, and lifecycle reliability. This article, targeting the demanding application scenario of flying cars—with stringent requirements for power rating, dynamic response, safety, and environmental adaptability—conducts an in-depth analysis of MOSFET selection for key power nodes, providing an optimized device recommendation scheme.

Detailed MOSFET Selection Analysis

1. VBP16R90S (N-MOS, 600V, 90A, TO-247)

图1: 高端混动路空一体飞行汽车方案与适用功率器件型号分析推荐VBE1105与VBP16R90S与VBM2157N产品应用拓扑图_en_01_total

Role: Main switch for high-voltage DC-DC conversion or motor drive stages in the propulsion system.

Technical Deep Dive:

- Voltage Stress & Reliability: In flying car powertrains, bus voltages can reach 400V or higher. The 600V-rated VBP16R90S offers a safety margin against voltage spikes and grid fluctuations. Its SJ_Multi-EPI technology ensures stable blocking capability and low switching losses, critical for handling high-frequency transitions in inverter or converter topologies, ensuring reliability during aerial maneuvers and variable loads.

- System Integration & Topology Suitability: With a low Rds(on) of 24mΩ at 10V and 90A continuous current, it suits high-power phases (e.g., 50kW-100kW) in multi-phase interleaved designs. The TO-247 package facilitates parallelization for power scaling and centralized heat dissipation, aligning with the compact, high-density requirements of flying car power electronics.

2. VBE1105 (N-MOS, 100V, 100A, TO-252)

Role: Main switch for low-voltage, high-current battery management or bidirectional DC-DC conversion in the energy storage system.

Extended Application Analysis:

- Ultimate Efficiency Power Transmission Core: Flying car batteries operate at low voltages (e.g., 48V or 100V) with high current demands. The 100V-rated VBE1105 provides ample margin, and its trench technology yields an ultra-low Rds(on) of 5mΩ at 10V. Combined with 100A continuous current, it minimizes conduction losses in synchronous rectification or motor drive circuits, enhancing overall system efficiency.

- Power Density & Thermal Challenge: The TO-252 package allows compact mounting on liquid-cooled or forced air-cooled heat sinks, ideal for space-constrained flying car modules. In soft-switching topologies like LLC, its low on-resistance reduces thermal stress, supporting high power density and extended battery life.

图2: 高端混动路空一体飞行汽车方案与适用功率器件型号分析推荐VBE1105与VBP16R90S与VBM2157N产品应用拓扑图_en_02_propulsion

- Dynamic Performance: Low gate charge and on-resistance enable high-frequency switching (up to hundreds of kHz), shrinking filter components and transformer size, crucial for lightweight and compact flying car designs.

3. VBM2157N (P-MOS, -150V, -40A, TO-220)

Role: Intelligent power distribution for auxiliary systems, safety interlocks, or high-side switching in control units.

Precision Power & Safety Management:

- High-Integration Intelligent Control: This P-channel MOSFET in a TO-220 package offers a -150V rating, suitable for 12V/24V or higher auxiliary buses in flying cars. It can serve as a high-side switch for critical loads like avionics, cooling fans, or safety actuators, enabling modular control based on fault signals or temperature cues, saving space in control boards.

- Low-Power Management & High Reliability: With a turn-on threshold of -2V and Rds(on) as low as 65mΩ at 10V, it allows direct drive by low-voltage MCUs, simplifying control paths. Its single-P design supports independent load switching, enabling fault isolation and enhancing system availability during flight operations.

- Environmental Adaptability: The TO-220 package provides robust mechanical stability, resisting vibration and temperature cycles in harsh aerial environments, ensuring reliable operation across altitude and weather changes.

System-Level Design and Application Recommendations

Drive Circuit Design Key Points:

图3: 高端混动路空一体飞行汽车方案与适用功率器件型号分析推荐VBE1105与VBP16R90S与VBM2157N产品应用拓扑图_en_03_battery

- High-Side Drive (VBP16R90S): Pair with an isolated gate driver. Implement negative voltage turn-off or active Miller clamping to mitigate Miller capacitance effects, ensuring noise immunity in high-voltage switching environments.

- High-Current Switch Drive (VBE1105): Use a pre-driver with high current capability for fast gate charge/discharge, minimizing switching losses. Layout must reduce power loop parasitic inductance to prevent voltage spikes.

- Intelligent Distribution Switch (VBM2157N): Can be driven directly by MCU via level shifting. Add RC filtering and ESD protection at the gate to enhance noise immunity in electromagnetic-intensive flight systems.

Thermal Management and EMC Design:

- Tiered Thermal Design: VBP16R90S requires mounting on a liquid cold plate or large heatsink; VBE1105 needs tight thermal coupling to a cold plate via pads; VBM2157N can dissipate heat through PCB copper pour or a small heatsink.

- EMI Suppression: Employ RC snubbers at switching nodes of VBP16R90S to damp high-frequency oscillations; parallel high-frequency capacitors with VBE1105 to filter harmonics. Use laminated busbars for power loops to minimize parasitics.

Reliability Enhancement Measures:

- Adequate Derating: Operate high-voltage MOSFETs at ≤70-80% of rated voltage; monitor junction temperature of VBE1105 strictly, even under cooling failures.

图4: 高端混动路空一体飞行汽车方案与适用功率器件型号分析推荐VBE1105与VBP16R90S与VBM2157N产品应用拓扑图_en_04_auxiliary

- Multiple Protections: Integrate current monitoring and fast fusing for branches controlled by VBM2157N, interlocked with main controllers for millisecond fault isolation.

- Enhanced Protection: Add TVS diodes near MOSFET gates. Maintain sufficient creepage/clearance distances for high-altitude or polluted conditions in flying car applications.

Conclusion

In high-power, high-reliability electrical systems for hybrid road-air integrated flying cars, MOSFET selection is key to achieving efficient propulsion, intelligent energy management, and all-weather operation. The three-tier MOSFET scheme recommended here embodies high power density, reliability, and intelligence.

Core value is reflected in:

- Full-Stack Efficiency & Power Density Improvement: From high-voltage conversion (VBP16R90S) to high-current battery handling (VBE1105), and down to auxiliary system control (VBM2157N), a compact, efficient energy pathway from power source to load is established.

- Intelligent Operation & Safety: The P-MOS enables modular control of safety and auxiliary circuits, supporting remote monitoring, predictive maintenance, and fault localization, boosting flight safety and operational efficiency.

- Extreme Environment Adaptability: Device selection balances voltage/current handling with packaging, coupled with robust thermal design, ensuring longevity in harsh aerial conditions like temperature swings, vibration, and frequent power cycling.

- Future-Oriented Scalability: Modular design allows power scaling via parallelization, adapting to evolving flying car battery capacities and power demands.

Future Trends:

As flying cars advance toward higher power (e.g., 500kW+), wireless charging, and vehicle-to-grid (V2G) integration, power devices will trend toward:

- Widespread use of SiC MOSFETs (above 1200V) for higher efficiency in propulsion inverters.

- Intelligent switches with integrated sensing and digital interfaces for real-time health monitoring.

图5: 高端混动路空一体飞行汽车方案与适用功率器件型号分析推荐VBE1105与VBP16R90S与VBM2157N产品应用拓扑图_en_05_thermal

- GaN devices in intermediate converters for MHz-range switching, pushing power density limits.

This scheme provides a comprehensive power device solution for flying cars, spanning propulsion, battery management, and auxiliary control. Engineers can refine it based on specific power levels (e.g., 200kW systems), cooling methods, and intelligence needs, building robust infrastructure for the future three-dimensional transportation network. In the era of low-altitude economy, superior power electronics hardware is the energy cornerstone for safe, efficient aerial mobility.