High voltage inverter, what is the high way? What is high - low - high way? A: high-speed high-voltage inverter is the inverter directly using high-voltage power supply as input, and direct output of high voltage for high-voltage motor use (input and output do not need to step-down transformer). High way mainly used in high-power high-voltage motor frequency control energy-saving occasions. High and low mode inverter is a high-voltage power supply step-down transformer step-down, with low-voltage inverter frequency control, and then step-up transformer voltage to the required voltage for high-voltage motor use, high and low methods are mainly used in low power High - voltage motor frequency conversion energy - saving occasions.