Sma Solar Technology Ag

Benjamin Sahan

Peter Zacharias

Regine Mallwitz

Samuel Vasconcelos Araújo

In an inverter includes two input lines for connection to a DC voltage source, two half-bridges connecting the two input lines, and two output lines for connection to an alternating current load or an AC power grid. Each half-bridge includes two pulse-operated switches with reverse connected diodes, each output line is connected to a center point of one of the half-bridges via an inductance, and the two output lines are connected to the same one of the input lines via a further pulse-operated switch behind the inductance with respect to the associated half-bridge.

Inverter capable of providing reactive power

An inverter () is described for feeding electrical energy into a power supply system () having in each case one input () which is intended for connection to the negative and positive output () respectively of a DC voltage generator () two outputs () which are intended for connection to the power supply system (), and a device, which has a strong inductor (L) and switches (Sto S), for conversion of a DC voltage to an AC voltage. The input () which can be connected to the negative output () of the DC voltage generator () can be grounded, and at least one of the two outputs () is provided with a mains inductor (L). According the invention, the device contains a bridge circuit with two current paths (S, L, SS, L, S) of which the one provides positive and the other negative output currents, a switching unit for switching, which is carried out at the power supply frequency, between the two current paths (S, L, SS, L, S) and a coupling capacitor () which connects the bridge circuit to the switching unit.

Inverter for feeding electric energy into a power supply system

The device is for feeding electricity into a power grid () with a DC generator (), a DC converter () and an inverter (), and particularly to a DC converter () suited for the device. The DC converter () comprises a choking coil () having two windings (w, w) that are magnetically coupled and conductively connected to each other, two switches (S, S) and three diodes (D, D, D), and is configured such that grounding of the direct current generator () at the negative output () thereof is possible and the power load of the switches (S, S) is kept small.

Device for feeding electric energy into a power grid and DC converter for such a device

The apparatus for feeding electrical energy into a power grid () with a DC voltage converter () intended for connection to a DC voltage generator () and with an inverter () connected thereto and intended for connection to a power grid (), wherein the inverter contains a bipolar voltage intermediate circuit with two capacitors (C, C) that are placed in series and are connected together at a ground terminal (E) intended for connection to a terminal of the DC voltage generator (). The DC voltage converter () comprises at least two diodes (D, D), one switch and one storage choke () which is charged by the DC voltage generator () when the switch is closed and is discharged via the capacitors (C, C) and the diodes (D, D) when the switch is open. On the one side, the storage choke () forms, together with two switches (S, S), a first electric circuit intended for charging said storage choke (), the electric circuit being adapted for connection to the DC voltage generator () by closing the switches (S, S) and that, on the other side, it lies, together with the two diodes (D, D) and the two capacitors (C, C), in a second electric circuit intended for simultaneously discharging of the storage choke () via both capacitors (C, C) and diodes (D, D), the second electric circuit being made operative by opening the switches (S, S).

Growing community of inventors

Kassel, Germany

Benjamin Sahan