Trench IGBT for High-side Bridge in True Sine Wave Solar Inverter Design
Unlike the Low-side IGBT, the High-side IGBTs in the full bridge of solar inverters are required to modulate at high frequency (typically 20 KHz). To reach that kind of performance, the new generation of IGBT – Trench IGBT, is the perfect match for the job. Thanks to the new die structure, Trench IGBT is capable of performing at much shorter Turn-off time (range of ns), which results in much higher switching frequency (range of Tens of KHz).
In the case of a Trench IGBT, the power density can be increased significantly from the same package (vs. Planar IGBTs), which reduces switching loss significantly. Hence, the heat sink size required can be reduced and so does the overall inverter size.
On the other hand, since the low-side IGBTs are commutating at a much lower frequency (50 – 60 Hz), planar IGBTs with good conduction loss performance are generally preferred. Trench IGBT with obvious benefits of delivering both low loss and high switching frequency performance is perfect for High-side Bridge in Solar Inverter, and also UPS, Induction Heating, SMPS and Frequency Converter applications.