Day: March 12, 2026

Powering Efficient and Reliable EV Power Systems

Key component solutions supporting traction inverter and on-board charger systems in modern electric vehicles.

Electric vehicles (EVs) rely on advanced power electronics to efficiently manage energy conversion, motor control, and battery charging. Two critical subsystems in this architecture are the traction inverter and the on-board charger (OBC).

The traction inverter converts DC power from the battery into AC power to drive the electric motor, while the OBC manages the safe and efficient charging of the battery from external power sources.

To ensure reliable operation, these systems require high-performance electronic components capable of handling high voltage, high current, and demanding automotive environments.

 

Application

Traction inverter and OBC systems are widely used across various electric mobility platforms, including:

• Battery Electric Vehicles (BEV)

• Hybrid Electric Vehicles (HEV)

• Plug-in Hybrid Electric Vehicles (PHEV)

• Electric buses and commercial vehicles

• EV charging and power management systems

These applications demand components that deliver precision, durability, and electrical stability under harsh operating conditions.

Engineering Background

In an EV power architecture, the traction inverter controls the speed and torque of the electric motor through high-frequency switching and pulse width modulation (PWM). At the same time, the on-board charger converts AC input power into regulated DC power to charge the vehicle’s battery.

This process requires multiple supporting components, including:

• Precision resistors for voltage measurement and current sensing

• Reliable connectors for secure electrical connections

• Surge protection components for transient voltage events

• Oscillators for precise timing and control signals

• Energy storage components for power stabilization

Each component plays a crucial role in maintaining system efficiency, safety, and long-term reliability.

The Challenge

Designing EV traction inverter and OBC systems presents several engineering challenges:

• Managing high voltage and high current power conversion

• Ensuring stable and accurate control signals for motor operation

• Protecting circuits from surges and electrical transients

• Maintaining reliable connections in vibration and harsh environments

• Stabilizing power during rapid load changes

Engineers must carefully select components that meet these demanding performance and reliability requirements.

iConnexion Solution

iConnexion supports EV power system development with a trusted ecosystem of components from five leading brands:

1. DACO Semiconductor – SiC MOSFET

   • High-efficiency switching for traction inverter and OBC

   • Handles high voltage and high current in demanding EV circuits

2. Fujipoly – SARCON Thermal Materials

   • Excellent thermal conductivity for power modules

   • Gap-filling properties reduce thermal resistance

   • Reliable under extreme automotive temperature cycles

3. Harwin – Press-Fit Pins

   • Secure, vibration-resistant connections for PCBs

   • Compact design for space-constrained electronics

4. Harwin – Pannut Spacers

   • Robust mechanical support for assemblies

   • Maintains board alignment and stability under vibration

5. Walsin – Automotive Passive Components

   • High-performance resistors, capacitors, and inductors

   • Ensure voltage regulation, current sensing, and stable operation

Summary

As electric vehicles continue to evolve, the demand for high-performance power electronics and reliable components becomes increasingly important.

By combining proven technologies from leading component manufacturers, iConnexion helps engineers develop safe, efficient, and high-performance EV power systems for next-generation electric mobility.