Inverters^*2 and converters^*3 are used to provide advanced control for drive motors used in EVs. Power semiconductors are used in inverters and converters, and are responsible for the switching (on/off) function for the high voltages and large currents that are needed to operate xEVs. In order for xEVs to become even more widely used, their range must be improved. One of the technologies needed to achieve this is smaller inverters and converters that operate at higher frequencies, and are more efficient. However, as they are made smaller and operable at higher frequencies, more robust countermeasures against characteristic degradation caused by heat generated in power semiconductors (semiconductor devices) become essential.
Silicon nitride substrates (see Fig. 1) are used as insulating substrates (see Fig. 3) for power modules (see Fig. 2) that are incorporated in inverters and converters. In addition to preventing current leakage in the circuit and increasing the strength of the power module, they dissipate heat transferred from the power semiconductor to copper parts, preventing degradation of the power semiconductor's characteristics.
Touted as one of the most effective technologies for reducing carbon dioxide emissions, the shift to xEVs is currently moving forward rapidly. In anticipation of growing demand for xEVs, the Company developed silicon nitride substrates in 2017 and began mass production in 2019. Currently, demand for silicon nitride substrates is growing rapidly, and this trend is expected to further accelerate going forward.

In order to meet the growing demand for silicon nitride (Si₃N₄) substrates, the Company has decided to invest in increased production at the Proterial Ferrite Electronics plant. Operation is scheduled to begin in the second half of 2023.

End of report

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