Power converter e.g. three-phase on-off power converter has measuring unit which is arranged in alternating current branches for detecting de-energized branch depending on switching state of several switchable power semiconductors

摘要

The power converter has a power determination device (1) which determines flowing stream of intermediate circuit current (Id) and phase current (i1-i3) by a switchable power semiconductor (20). The power determination device is provided with an alternating current measuring unit (10) which is designed as Rogowski coil and is arranged in alternating current branches for detecting the de-energized branch depending on the switching state of several switchable power semiconductors which are provided in the alternating current measuring unit. An independent claim is included for method for determining intermediate circuit current and phase current.