Addressing Testing Challenges for Power Modules and Three-Level Inverters

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The use of renewable energy sources is one of the key issues when it comes to developing the next-generation worldwide energy supply. The need for improvements in efficiency and reliability is leading to the increasing diffusion of three-level IGBT inverters: featuring smaller output voltage steps than two-level topologies, they provide a cleaner output waveform, resulting in a more effective switching frequency. Because the IGBTs are subjected to a lower bus voltage, lower-voltage modules can be used. For this reason, three-level topologies are being widely used in various applications requiring high voltages, including photovoltaics and wind power inverters. Compared to the equivalent two-level modules, these products pose some specific challenges in regard to their production testing. In particular, they require to operate with multiple programmable and independent drivers to condition each section of the module under test properly, in order to measure all the working parameters. In addition to that, special attention must be paid to the design of a signal path with minimal stray inductance, in order to minimize voltage overshoots during signal commutation. These, and many other technological challenges, have been faced and solved by SPEA over the past 45 years. The DOT800T test platform represents the state-of-the-art equipment that has made SPEA a global leader in testing power products.

Elia Petrogalli photo

Elia Petrogalli

Sales Manager Semi & MEMS Business Unit


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