Robust power-path and three-phase motor-drive semiconductor solutions for electric steering, braking, active suspension, stability control and other safety-critical chassis actuators.
Protected high-current power delivery for safety-critical chassis actuators
Modern chassis and safety systems use electrically driven pumps, steering motors, brake actuators and suspension mechanisms that must respond quickly and predictably from a noisy 12 V or 48 V vehicle supply. A practical architecture combines a high-current bus switch for controlled power-path connection, inrush management and rapid fault isolation with a three-phase full bridge that delivers bidirectional torque to a BLDC or PMSM actuator. Coordinated PWM control, current feedback and diagnostic supervision help the system maintain low conduction loss, fast protection response and stable actuator performance during cranking, load-dump, thermal stress and dynamic vehicle maneuvers.
Key advantages
High-current vehicle-bus switching
Low conduction loss
Controlled inrush current
Fast fault isolation
Bidirectional motor torque
Efficient three-phase actuation
Rapid overcurrent response
Current and thermal feedback readiness
12 V / 48 V platform scalability
Support for regenerative current paths
Robust transient tolerance
Safety-diagnostic integration
Chassis and safety architecture and product mapping
Chassis & Safety Actuator Architecture
Protected vehicle-bus power switching, three-phase full-bridge actuation and feedback paths for steering, braking, suspension and stability-control systems.
Tip: Select a block in the diagram or choose a module from the list. On mobile, swipe horizontally to view the full diagram.
Explore the chassis and safety power architecture through the interactive block diagram. Select Bus Switch or Three-Phase Full Bridge to review each function, key engineering considerations and placeholder MOT device mapping.
About the solution
Controlled vehicle-bus connection followed by bidirectional three-phase actuation
The vehicle supply enters through filtering and transient protection, then passes through a high-current bus switch that controls startup, limits inrush and isolates the downstream drive during faults. The protected DC bus feeds a three-phase full bridge that regulates current and torque in the chassis actuator. A safety ECU supplies enable and PWM commands while monitoring phase current, position, temperature and diagnostic status to coordinate predictable shutdown or degraded operation when abnormal conditions are detected.
Scalable for electric steering, brake pumps, active suspension and stability-control actuators
The same power-path and bridge functions can be adapted for electric power steering, electro-hydraulic brake or ABS pumps, brake-by-wire actuators, active suspension compressors, roll-control motors and other chassis mechanisms. Semiconductor current rating, voltage margin, bridge topology, switching frequency, thermal design and diagnostic coverage can be scaled for 12 V and 48 V vehicle platforms and for different actuator duty cycles.
Low-loss MOSFETs and power-path devices for safety-critical switching positions
High-current bus-switch MOSFETs, back-to-back power-path devices, three-phase bridge MOSFETs, clamp and freewheel diodes, gate-driving functions, current-sense devices and protection supervisors form a practical semiconductor platform for compact, efficient and diagnosable chassis-control electronics.
Controlled vehicle-bus connection followed by bidirectional three-phase actuation
The vehicle supply enters through filtering and transient protection, then passes through a high-current bus switch that controls startup, limits inrush and isolates the downstream drive during faults. The protected DC bus feeds a three-phase full bridge that regulates current and torque in the chassis actuator. A safety ECU supplies enable and PWM commands while monitoring phase current, position, temperature and diagnostic status to coordinate predictable shutdown or degraded operation when abnormal conditions are detected.
Scalable for electric steering, brake pumps, active suspension and stability-control actuators
The same power-path and bridge functions can be adapted for electric power steering, electro-hydraulic brake or ABS pumps, brake-by-wire actuators, active suspension compressors, roll-control motors and other chassis mechanisms. Semiconductor current rating, voltage margin, bridge topology, switching frequency, thermal design and diagnostic coverage can be scaled for 12 V and 48 V vehicle platforms and for different actuator duty cycles.
Low-loss MOSFETs and power-path devices for safety-critical switching positions
High-current bus-switch MOSFETs, back-to-back power-path devices, three-phase bridge MOSFETs, clamp and freewheel diodes, gate-driving functions, current-sense devices and protection supervisors form a practical semiconductor platform for compact, efficient and diagnosable chassis-control electronics.
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