SiC boost for three-phase PV inverter

July 20, 2020 //By Nick Flaherty
The NXH40B120MNQ family of full SiC power modules from On Semiconductor is being used in a three phase photovoltaic inverter from Delta with an efficiency of 98.8 percent
The NXH40B120MNQ family of full SiC power modules from On Semiconductor is being used in a three phase photovoltaic inverter from Delta with an efficiency of 98.8 percent

Delta is using a full silicon carbide SiC power module from On Semiconductor for a high efficiency three phase PV string inverter family.

The NXH40B120MNQ family of power modules integrate a 1200 V, 40mΩ SiC MOSFET and 1200 V, 40 A SiC boost diode with dual boost stage. SiC switches provide low reverse recovery and fast switching for the high levels of power efficiency required in applications such as solar inverters, achieving up to 98.8 percent.

"Silicon Carbide technology has the potential to revolutionize the energy market," said Asif Jakwani, senior vice president of the Advanced Power Division at On Semiconductor. "The full SiC integrated power modules developed by On Semiconductor address the need for higher system efficiency at elevated power levels in solar inverters, and demonstrate the maturity of SiC technology."

"With our focus on providing innovative, clean and energy-efficient solutions for a better tomorrow, we are always looking to engage with suppliers that can help us achieve highest efficiency, reduce product volume and weight, and meet the needs of the global solar PV market,” said Raymond Lee, head of Delta’s PV Inverter Business Unit. He added, "The full SiC power modules from On Semiconductor were selected for our M70A 70kW three-phase PV string inverter because they provide best in class performance, which combined with our unique expertise in high-efficiency power electronics, allow our products to achieve peak energy conversion efficiency as high as 98.8 percent."

As part of On Semiconductor's growing portfolio of Power Integrated Modules (PIMs) based on wide bandgap (WBG) technology, the NXH40B120MNQ offers a high level of integration with pin assignment optimized for inverter design. By using SiC components, the power module delivers low conduction and switching losses, enabling the use of higher switching frequencies, which contributes to higher inversion efficiency. The modules are designed for ease of use, with solderless press-fit connections and customer-defined thermal interface options.

Next: SiC module video


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