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6 Frequently Asked Questions about “Inverter voltage safety”
Are traction inverters covered by safety standards?
As vehicle manufacturers pivot to electronic systems like traction inverters, so must the coverage of such systems by our safety standards. While traditional "product safety" refers to the elimination of risk from electrical shock, fire and mechanical hazards, "functional safety" specifically refers to electrical and electronic system hazards.
What is a functional safety concept for an HV traction inverter?
NXP has developed a functional safety concept for an HV traction inverter that addresses these two points. It defines several system deliverables that customers can use to build their own concept more quickly.
What does a power inverter do?
Focuses on vehicular electric power systems analysis, design, prototyping and testing to meet functional safety needs. The power inverter controls energy conversion between an electric source (e.g. battery) and the mechanical shaft of the pmsm motor based on torque requested from Vehicle Control Unit (VCU).
What are the functional safety requirements for traction inverter?
The Functional Safety Requirements for traction inverter is drawn in accordance to part 3- Concept phase of ISO 26262. The Item Definition, Hazard Analysis and Risk Assessment is derived for few faults and hazards in inverter and respective Safety goals are derived with the help of Fault Tree Analysis and came up with the safety requirements.
How safe is an EV HV inverter?
In the case of an EV HV inverter, the definition of the safe state is quite complex due to a high amount of energy flowing into the electrical motor. In some cases this can result in unstable behavior instead of ensuring the safe state that is requested by the system.
What is a safety goal for an EV HV inverter?
These hazards are then ranked by risk level according to the ASIL levels laid out in ISO 26262. As shown in figure 2, in this case a safety goal could be to avoid unintended acceleration if the vehicle is stopped. Figure 2: Examples of hazards and safety goals for an EV HV inverter