search for: igbt

...that the CPU control board for old and new versions is the same. Only the firmware is different. The hardware design is similar for all devices. Switch mode step down power supply to charge the batteries Switch mode symmetrical step up to + and - 375 volt using FET bridge Half bridge using IGBT to chop the +- 375V to a true sinus Optional additional power supply to battery voltage (half the power rating of the unit). So that the output is frequency unrelated to the input. The difference between smaller and bigger units is in the coils, transformers and number and or size of FET's...