![]() ![]() ![]() Prior to the emergence of OEM EVs, power semiconductor modules were designed specifically for industrial applications, with the vast majority being used in 3-phase motor drives supplied by the AC mains. Consequently, the available voltage ratings were in rather coarse steps of 600 V for 208-240 VAC mains applications, 1,200 V for 440-480 VAC, 1,700 V for 575-600 VAC, and so on. Furthermore, 3-phase motors also come in rather coarse power rating steps, so the current ratings for modules were equally coarse as well. Also, industrial applications tend to be more concerned with reliability and efficiency than with minimizing size (and the noise from “singing” motors and transformers), so the diodes and switches inside the modules weren’t particularly fast (i.e. ![]() PWM frequency rarely exceeded 10 kHz, and was usually closer to 1 kHz, especially at 1,200 V and above). Finally, while the market for all industrial motor drives is quite large, the market for any one particular voltage/current combination is relatively small, and some combinations of voltage/current just don’t make sense industrially. ![]()
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