HV Multi-Level Inverter

2-level vs. 3-level inverter topology

The state-of-the-art automotive inverter is 2-level topology inverter. It controls the voltage waveform of the output with 3 electric potentials of phase-to-phase voltage while our new 3-level inverter has 5 different electric potentials. The output waveform of the 3-level inverter is closer to a sinusoidal curve, resulting in a reduction of harmonic losses in the e-motor and improved NVH characteristics. With this topology, we achieve switching loss reduction and reduce the stress for the motor insulation over its lifetime.

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Market-ready GaN semiconductor Inverters for high-frequency applications

Pushing the efficiency limits with 3-Level 800 V GaN inverter, hofer powertrain brings a vast expertise in developing inverters utilizing future-proof technologies such as GaN semiconductors and achieves outstanding results specifically for high-power and high-frequency powertrain applications for various modern vehicle types. At the same time, other chip technologies still can be relevant for specific application areas – the inverter is developed to function utilizing all 3 semiconductor technologies depending on individual needs.

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Optimized bearing current behavior, EMC and costs

With reduced excitation of common mode voltage on the shaft comes along reduced bearing currents and therefore optimized EMC characteristics and reduction of costly countermeasures.