Electric Vehicle Architecture
Typical power electronics configuration for EV/HEV applications
Traction Inverter
The traction inverter converts DC power from the battery to AC for the traction motor. This is typically the highest power module in the vehicle and requires maximum efficiency and power density. It operates at high switching frequencies to minimize acoustic noise and motor losses.
On-board Charger
The on-board charger converts AC line power to DC to charge the main battery. This system requires high efficiency to minimize charging time and includes PFC (Power Factor Correction) functionality to meet grid requirements.
DC/DC Converter
The DC/DC converter provides low voltage power for vehicle accessories and the 12V electrical system from the high voltage battery. This requires galvanic isolation and precise voltage regulation.
Key Requirements
- Extreme power density for space-constrained packaging
- Maximum efficiency for extended range
- Automotive reliability standards (AEC-Q101)
- Functional safety compliance (ISO 26262)
FAE Technical Commentary
Expert insights on EV & HEV applications
For traction inverter applications, we recommend SKAI Drive systems which provide complete automotive-qualified solutions with integrated thermal management. These systems have been pre-qualified by major automotive manufacturers, reducing development time and risk.
When designing for fast charging applications, utilize Semikron's latest IGBT technology with optimized switching characteristics. The balance between conduction and switching losses is critical for the partial load efficiency required during charging.
For safety-critical systems, implement redundant power semiconductors or utilize components with built-in diagnostic capabilities. Semikron's automotive-qualified products include integrated diagnostic features that support functional safety requirements.