Sma Solar Technology Ag

Jens Friebe

Oliver Prior

Peter Zacharias

Thomas Wappler

Burkard Mueller

Stefan Buchhold

Michael Kotthaus

Torsten Soederberg

Ephraim Moeser

Frank Greizer

Matthias Victor

Klaus Rigbers

Felix Blumenstein

Ann-Katrin Gerlach

Jan Scheuermann

Markus Hopf

Sven Bremicker

Gerd Bettenwort

Regine Mallwitz

Torsten Leifert

Sebastian Bieniek

Michael Viotto

Martin Putz

Stijn Stevens

Burkard Müller

Volker Wachenfeld

Sebastian Lederer

Matthias Zinn

Peter Lahnor

Matthias Zin

Jonathan Blanz

Regine Dr-Ing Mallwitz

Peter Prof Dr-Ing Zacharias

An LC filter arrangement includes a filter capacitor that connects the first output terminal to the second output terminal, a magnetic core, and a choke having a plurality of turns surrounding the magnetic core, and a first choke terminal and a second choke terminal. Each of the turns is formed by a separate conductor segment, at least partially surrounding the magnetic core. The LC filter arrangement is mounted on a circuit board and is electrically connected to a conductor track of the circuit board.

LC filter arrangement and electrical or electronic device having such an LC filter arrangement

An inverter for a photovoltaic system includes a substantially planar baseplate having a front and a rear, wherein the rear forms an outer rear wall of the inverter, and having at least one platform-like elevation that rises in the direction of the front of the baseplate. The inverter also includes a printed circuit board having one or more heat-generating components mounted thereon, wherein the printed circuit board is installed on the baseplate such that the one or more heat-generating components are arranged on the printed circuit board in the region of the platform-like elevation and are in thermal contact with the platform-like elevation. The inverter further includes a potting compound that fills a space on the front of the baseplate and surrounds at least partially the printed circuit board, and a cover arranged on or in the potting compound that adjoins the baseplate, so that the baseplate and the cover surrounding at least part of the potting compound form a housing. The inverter also includes at least four DC connectors that are arranged in pairs on at least one of the lateral end faces of the housing and at least part of which is cast in the potting compound, and an AC connector that is arranged on one of the lateral end faces of the housing, wherein electrical contacts of the AC connector are connected to the printed circuit board.

Inverter

A circuit arrangement includes a power semiconductor switch, a freewheeling diode, and a storage choke having a core and a winding coupled between a first choke terminal and a second choke terminal. The storage choke is configured to conduct a current flowing across the power semiconductor switch. The arrangement also includes a driver circuit configured to drive the power semiconductor switch via the control terminal thereof.

Circuit arrangement and power electronic converter circuit having a driver circuit and a coil

The disclosure relates to an inverter with at least one inverter bridge and at least two galvanically isolating DC/DC converters, outputs of the DC/DC converters being connected in parallel with one another and being connected to inputs of the inverter bridge. At least two of the DC/DC converters are intercoupled on the input side via a diode, such that the diode is connected with its terminals to one of the inputs of the two direct voltage converters in each case. The disclosure also relates to a use for such an inverter.

Inverter with at least two DC/DC converters and use of such an inverter in a photovoltaic installation

The disclosure relates to an inverter with at least one inverter bridge and at least two DC converters, the outputs of the DC converters being connected to inputs of the inverter. The inverter includes an exchangeable adapter having input terminals for connection to power sources or loads and output terminals connected via input terminals to inputs of the DC-DC converters. Within the adapter each of the output terminals is connected to one of the input terminals and/or another of the output terminals.

Inverter with at least two direct converters

An inverter including a circuit arrangement configured to measure an insulation resistance is disclosed. The inverter includes at least one half-bridge including at least two switching elements extending between respective end points, and a grid disconnection point comprising a series circuit comprised of two disconnection devices. The series circuit is arranged between a center point of the half-bridge and an AC voltage terminal of the inverter, which AC voltage terminal is configured to connect to a phase conductor or a neutral conductor of an AC voltage grid. The circuit arrangement includes a resistor and a voltage measurement apparatus. The resistor is arranged electrically in parallel with one of the disconnection devices and the voltage measurement apparatus is arranged electrically between the output-side terminal of the resistor and one of the end points of the half-bridge.

Inverter having grid disconnection point and insulation resistance measurement and method for measuring an insulation resistance

An unfolding bridge includes a half-bridge with a first input terminal, a second input terminal, and an output terminal, wherein the half-bridge includes a first bridge switch connected between the first input terminal and the output terminal and a second bridge switch connected between the second input terminal and the output terminal. The unfolding bridge also includes a further half-bridge which includes a first further bridge switch connected between the first input terminal and a further output terminal and a second further bridge switch connected between the second input terminal and the further output terminal. A switch controller for operation of the bridge switches is designed such that a connection of the output terminals with the input terminals via the bridge switches is reversed at a zero crossing of an alternating current flowing at the output terminals. In a current path between the input terminals via the first bridge switch, the output terminals, and the second further bridge switch, and in a current path between the input terminals, via the first further bridge switch (S5), the output terminals, and the second bridge switch, at least one reverse voltage compensator is arranged. The reverse voltage compensator is configured to shift the electrical potential of the respective input terminal with respect to the respective output terminal, between which the reverse voltage compensator is arranged, by a compensation voltage dropped across the reverse voltage compensator, and thereby compensates for a reverse voltage that is oriented against the flow of current in the current path in which the reverse voltage compensator is arranged.

Unfolding bridge, inverter having reactive-power capability, and polarity reversing method

The disclosure relates to an inverter for supplying a power provided as a DC voltage at a DC input to an AC mains connectable to an AC output. In this case, the inverter includes a switching network with a plurality of semiconductor switches and a digital control unit for producing a digital switching pattern for digitally operated semiconductor switches of the switching network that are able to be used to produce a first output voltage (U). The inverter additionally includes a linear control unit for producing signals for actuating at least one semiconductor switch of the switching network in a linear mode, wherein the linear control unit is set up to produce a voltage drop (U) across and/or a current (I) through the at least one linearly operated semiconductor switch to a target value that is dependent on an instantaneous difference between the first output voltage (U) and a voltage (U) of the AC mains. The disclosure additionally relates to a control method for such an inverter and a photovoltaic (PV) installation having such an inverter.

Inverter and control method for an inverter

In order to measure a choke current through a choke, a flux density of a magnetic field which is emitted by the choke is consecutively measured at a sampling rate at a location which is fixed in relation to the choke. A magnetic bias of the choke is ascertained from the measurement values of the flux density at a known choke current which occurs during operation of the choke, wherein the choke current is known only in longer time intervals than the inverse value of the sampling rate during measurement of the flux density. The actual choke current is determined from the actual measurement values of the flux density taking into account the ascertained magnetic bias.

Method and device for monitoring and measuring a current on a magnetically biased choke

The disclosure relates to a safety device for a photovoltaic system for feeding into a power supply system, that includes at least one input for connection to a PV generator, at least one output for connection to an inverter, and a switching element for de-energizing the at least one output. The safety device includes an evaluating unit configured to switch the switching element based on a low-frequency signal at the at least one output. The disclosure also relates to a method for operating such a safety device.

Safety device for a photovoltaic system

A method for operating an inverter with reactive power capability that includes a voltage link circuit and an unfolding bridge, wherein poles of the voltage link circuit are configured to be selectively connected to terminals of an AC output in different configurations by means of the unfolding bridge, in order to change a polarity of the AC output relative to the voltage link circuit. The method includes in the case of a phase shift between an AC current (I) and an AC voltage (U) at the AC output reversing the direction of a current flowing via the voltage link circuit. Reversing the direction of the current flowing via the voltage link circuit includes disconnecting the AC output from the voltage link circuit, providing a freewheeling path between the terminals of the AC output, while the AC output is disconnected from the voltage link circuit, and reconnecting the AC output to the voltage link circuit with the polarity of the AC output relative to the voltage link circuit being changed by the unfolding bridge.

Method for operating an inverter with reactive power capability having a polarity reverser, and inverter with reactive power capability having a polarity reverser

A protective device for a photovoltaic system includes at least one input for connection to a photovoltaic generator and at least one output for delivery of an electric power supplied from the photovoltaic generator. The protective device includes a detection device for a signal applied via the at least one output, and is configured to provide a low level-limited voltage at the at least one output if an applied signal does not meet a predetermined criteria, and is further configured to connect the at least one output with low resistance to the at least one input via a switching device if the applied signal meets the predetermined criteria.

Protective device for a photovoltaic system

The disclosure relates to a DC/DC converter including at least one clocked switching member and at least one inductor which is arranged between an input connection and an output connection of the DC/DC converter and is for intermediate storage of energy transferred by the DC/DC converter, wherein the inductor has a core with permanent magnetization. The DC/DC converter is configured for bidirectional operation, wherein, in a first energy transfer direction, the at least one switching member is switched in a first operating mode and, in a second energy transfer direction which is opposite to the first, the at least one switching member is switched in a second operating mode which deviates from the first. The disclosure also relates to an operating method for a DC/DC converter.

Bidirectional DC converter comprising a core with permanent magnetization

The disclosure relates to a capacitor arrangement for an input circuit or intermediate circuit of a voltage transformer comprising at least two capacitors and two connection nodes. Switching elements are provided, by means of which the at least two capacitors are connected in parallel with each other in a first operating state and are connected in series with each other in a second operating state. The disclosure also relates to a voltage transformer arrangement comprising such a capacitor arrangement and an operating method for a capacitor arrangement.

Capacitor arrangement for an intermediate circuit of a voltage converter

An inductor apparatus includes an inductor winding, a core defining a magnetic circuit for a magnetic flux generated by a current flowing through the inductor winding, at least one permanent magnet magnetically biasing the core by its permanent magnetization, and a magnetization device operable for adjusting a desired magnetization of the permanent magnet. The at least one permanent magnet is arranged within the magnetic circuit of the magnetic flux generated by the current flowing through the inductor winding. The magnetization device includes a magnetization winding and a circuitry configured to subject the magnetization winding to magnetization current pulses, thereby generating at a location of the permanent magnet a magnetic field which is able to change the permanent magnetization of the permanent magnet.

Growing community of inventors

Vellmar, Germany

Jens Friebe