Sma Solar Technology Ag

Andreas Jeppe

Sven Bremicker

Frank Greizer

Burkard Mueller

Henrik Wolf

Adrian Haering

Torben Westphal

Hannes Knopf

Dr-Ing Henrik Wolf

Adrian Häring

In an overvoltage protection apparatus before an inverter configured to feed electric energy from a DC voltage source into an AC power grid, the overvoltage protection apparatus includes a DC voltage input stage. The DC voltage input stage includes at least two current-carrying lines and an EMC filter including interference suppressing capacitors and interference suppressing inductors, and surge arrestors configured to divert overvoltages with respect to ground are connected to the current-carrying lines after the EMC filter, from a point of view of the DC voltage source.

Overvoltage protection for inverters that comprise an EMC filter at their input end

The invention is directed to a circuit array with a relay (K; K) incorporating a field coil (E) as well as a switch contact (), said switch contact () being provided as a switch point between a grid, in particular a mains supply (N), and an inverter (WR) fed by a direct voltage source, in particular by a photovoltaic generator (PVG), said relay (K; K) being configured to be a bistable relay.

Circuit arrangement with a relay incorporating one field coil as well as switch contacts

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Kaufungen, Germany

Andreas Jeppe