SDAA370 May   2026 UCC34141

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
    1. 1.1 End-Equipment Traction Inverter
    2. 1.2 Why is Safety Needed in Inverter?
    3. 1.3 FuSa Development Flow
      1. 1.3.1 V-Model Development
      2. 1.3.2 Inverter Safety Lifecycle
  5. 2FuSa Requirements for Traction Inverter
    1. 2.1 Traction Inverter Structure and Function Introduction
    2. 2.2 FuSa Requirements Derivation Process
    3. 2.3 Safety Goal
    4. 2.4 FuSa Concept
      1. 2.4.1 FSC Design Architecture
      2. 2.4.2 Fault Tree Analysis
      3. 2.4.3 FuSa Requirement
    5. 2.5 Technical Safety Concepts
      1. 2.5.1 TSC Design Architecture
      2. 2.5.2 Failure Mode and Effect Analysis
      3. 2.5.3 Technical Safety Requirements
  6. 3Safety Design Implementation on Inverter
    1. 3.1 TI FuSa Product
    2. 3.2 How Does TSR Implement?
      1. 3.2.1 Position Sensor
      2. 3.2.2 MCU
      3. 3.2.3 Logic Circuit
      4. 3.2.4 Smart Isolated Gate Driver
    3. 3.3 Dependent Failure Consideration
    4. 3.4 Detailed FuSa Design Structure for Traction Inverter
    5. 3.5 Achieving FuSa Requirements with TI Safety Devices
      1. 3.5.1 MCU
      2. 3.5.2 Gate Driver
        1. 3.5.2.1 Gate Monitor Circuit and Over Current Protection
        2. 3.5.2.2 Other Safety Mechanisms in UCC5881-Q1
      3. 3.5.3 Isolated bias supply
        1. 3.5.3.1 Centralized LV Isolated Power Supply Architecture
        2. 3.5.3.2 Fully Distributed LV Isolated Power Supply Architecture
        3. 3.5.3.3 Semi-Distributed LV Isolated Power Supply Architecture
        4. 3.5.3.4 HV Isolated Bias Supply
        5. 3.5.3.5 TI's Design for Isolated Bias Supply in Traction Inverter
      4. 3.5.4 Power Management IC
        1. 3.5.4.1 Multiple Paths Power Rail with Protection and Independent Thermal Shut-Down
        2. 3.5.4.2 Power Rail Voltage Monitoring
        3. 3.5.4.3 MCU Fault Monitor and other Protection Mechanisms
      5. 3.5.5 Position Sensor
      6. 3.5.6 Current Sensor
      7. 3.5.7 Voltage Sensor
        1. 3.5.7.1 Isolated DC Voltage Sensing
        2. 3.5.7.2 Non-Isolated DC voltage sensing
      8. 3.5.8 Temperature Sensor
  7. 4Summary
  8. 5References

2.4.1 FSC Design Architecture

Figure 2-2 shows the FSC level traction inverter system block diagram. FTA is performed according to the system architecture illustrated in this figure. The functions of each element are listed in Table 2-2.

FSR Level Traction Inverter System Block Diagram Figure 2-2 FSR Level Traction Inverter System Block Diagram
Table 2-2 Key Elements in Traction Inverter
Element ID Element Name Description
E1 Motor phase currents measurement circuit Measures the inverter phase currents at power stage and transmits to MCU for FOC and operating condition monitoring.
E2 Rotor position measurement circuit Measures the motor rotor position and transmits to MCU for FOC and operating condition monitoring.
E3 DC Voltage sensor Measures the inverter power supply at the power stage for FOC and operating condition monitoring.
E4 Microcontroller circuit Executes the FOC algorithm, monitors sensor data, generates PWM signals, and communicates with external systems.
E5 Interface circuit Provides communication transceiver functionality between the inverter and external systems.
E6 Gate driver circuit Provides the required voltage and driving current for the power module according to input PWM signals
E7 Power management circuit Provides power supplies to key devices in the inverter on the LV side; also provides external watchdog and error monitoring for the MCU.
E8 DC-Link Capacitor Capacitor for the power stage to stabilize and maintain the HVDC input voltage.
E9 Active discharge circuit Provides active discharge for the DC-link capacitor during power-off or repair operations.
E10 Power module Generates required modulated motor phase currents from the HV battery under the control of the gate driver circuit
E11 Isolated bias supply Provides HV side isolated power supply for the gate driver circuit and voltage sensing circuit.
E12 Temperature measurement circuit Measures the power stage temperature for operating condition monitoring.