Fronius International Gmbh

Bernhard Staudinger

Andreas Luger

Gerhard Wallisch

Gerhard Reiter

Bernhard Doppelbauer

Florian Durst

Daniel Chalupar

In order to protect an inverter from prohibited switching states, a monitor including monitoring inputs and monitoring outputs is provided. The monitoring inputs are connected to the control outputs in order to receive the switching patterns, and the monitoring outputs are connected to the power switches. The monitor is designed to compare a transition from a first switching pattern to a second switching pattern with a number of prohibited transitions and/or with a number of permitted transitions and block the second switching pattern in the event of a match with one of the prohibited transitions and/or in the event of a deviation from the number of permitted transitions and to output the second switching pattern to the power switches via the monitoring outputs in the event of a deviation from the number of prohibited transitions and/or in the event of a match with one of the permitted transitions.

Monitoring unit for an inverter

The invention relates to an inverter () for converting a direct voltage (U) into an alternating voltage (U) for feeding into a single-phase three-conductor network () and for supplying loads (), comprising a DC input (), an intermediate circuit () having an intermediate circuit center point (), a DC/AC converter () having at least two half bridges (), a control device (), and an AC output () for connecting to the single-phase three-conductor network () and the loads ('). The invention further relates to a method for operating such an inverter (). According to the invention, the control device () is designed to connect, in an emergency power operation (BOM), one half bridge () of the DC/AC converter () to a phase conductor (L) of the AC output (), to connect the other half bridge () of the DC/AC converter () to another phase conductor (L) of the AC output (), and to connect the intermediate circuit center point () to the neutral conductor (N) of the AC output () and to halve the amplitude of the output signal (U, U) of the half bridges (), and to perform a phase shift of the output signal (Uor U) of one half bridge (or) by 180&#xb0; such that at least some loads () can also be supplied in emergency power operation (BOM).

Inverter and method for operating an inverter

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Steinbach an der Steyr, Austria

Bernhard Staudinger