1results about How to "Suppresses inrush current" patented technology

This invention provides an inverter device that, in a superimposed control method for suppressing inrush current flowing to the main transformer by superimposedly applying voltages from an external power source when the main power supply is turned on, can suppress inrush current from various external power sources. The inverter device generates a predetermined three-phase variable frequency voltage from a three-phase AC power source and includes: a main transformer that applies a first voltage from an external three-phase AC power source to the three-phase primary winding on the primary side and obtains a predetermined voltage from the three-phase secondary winding on the secondary side; and an inverter body comprising multiple inverter units connected to the three-phase secondary winding of the main transformer. The main transformer has a third three-phase winding on the primary side such that when the first voltage is applied to the three-phase primary winding, a second voltage lower than the first voltage is superimposedly applied to the primary side. The main transformer has connection terminals at both ends of each phase winding of the third three-phase winding.