Power Conversion: Power Electronic Subsystems Power conversion is at the core of every ETM product.  ETM has developed and produced a comprehensive series of power inverter modules.  These power supplies and inverters range from 500W to hundreds of kilowatts, and include standard families of AC to DC and DC to AC converters.They are applied in virtually every ETM  product, from creating 100 kV of DC high voltage in a radar transmitter, to inverting 500V DC into 240V three phase AC in a high power solar inverter.