Sma Solar Technology Ag

Peter Zacharias

Regine Mallwitz

Jens Friebe

Benjamin Sahan

Bernd Engel

Ann-Katrin Gerlach

Oliver Prior

Klaus Rigbers

Felix Blumenstein

Jan Scheuermann

Michael Viotto

Samuel Vasconcelos Araújo

Mehmet Kazanbas

Christian Noeding

Matthias Zinn

Matthias Zin

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.

Dynamically biased inductor

An AC inductor includes a core, at least one permanent magnet for magnetically biasing the core, an inductor winding on the core, and a circuitry which guides an alternating current which flows through the AC inductor in such a way through the inductor winding that, during each half-wave of the alternating current, the alternating current generates a magnetization of the core which is opposite to the magnetization by the permanent magnet. This circuitry includes a commutator which guides the alternating current flowing between two contacts of the AC inductor through the same part of the inductor winding with a same flow direction during each of the half-wave of the alternating current.

Magnetically biased AC inductor with commutator

An inverter for converting a direct current flowing between two input lines into an alternating current flowing between two output lines includes first and second series circuits each including two switches configured to switch at a high frequency and of an inductance connected between the switches, wherein the two inductances are magnetically coupled. The inverter further includes diodes which lead from opposite sides of the inductances to a first intermediate point and diodes leading from a second intermediate point to the opposite sides of the inductances, and an unfolding circuit which forwards a direct current flowing between the intermediate points and consisting of sine-shaped half-waves to the output lines with a polarity changing half-wave by half-wave.

Inverter with coupled inductances

A transformerless inverter that serves to feed electricity from a DC current source into an AC power grid, has an inverter bridge and a DC/DC converter connected upstream of the inverter bridge. The DC/DC converter converts an input DC voltage that is present between two input lines of the inverter into a DC link voltage present between two input lines of the inverter bridge. The inverter bridge converts the DC link voltage present at the input lines thereof into an output AC voltage. The DC/DC converter includes at least one resonant circuit that has a resonance inductance and a resonance capacitance and is connected on its input side via at least two clocked switches to one of the two input lines of the inverter or an intermediate potential line carrying a potential in between. The input lines of the inverter and the input lines of the inverter bridge are galvanically isolated from one another by a capacitive method. The resonant circuit may be undivided and is connected alternately to the two input lines of the inverter bridge.

Transformerless inverter comprising a DC/DC converter

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

A direct current-direct current (DC/DC) converter operated in the resonant mode of operation for converting a direct input voltage into a direct output voltage with a bridge circuit located on the input side and incorporating switching elements, with a resonance circuit incorporating a resonance inductance and a resonance capacitance as well as with a high-frequency transformer for galvanic separation is disclosed, the transformer incorporates at least one primary winding and at least one secondary winding with at least two winding terminals each. The alternating current (AC) output of the bridge circuit is connected to the primary winding and a rectifier bridge with diodes to the secondary winding. A voltage boosting circuit array is connected downstream of the resonant circuit in such a manner that at least one additionally controllable switching element is contained, which is connected in parallel or in series to at least one additional diode or to at least one diode of the rectifier bridge on the secondary side, this array being connected in parallel to the high-frequency transformer so that the additional switching element short-circuits the resonance circuit in a triggered condition so that energy is stored in the resonance inductance and is delivered in the non-triggered condition.

System and method for a power converter having a resonant circuit

The object of the invention is a high-efficiency DC/DC converter, in particular for photovoltaic plants, incorporating a transformerless DC/DC converter operated in the resonant mode of operation for converting a unipolar direct input voltage with an associated positive pole (+) and with a negative pole (&#x2212;). There is imposed a resonance circuit incorporating at least one resonance inductance and at least one resonance capacitance, each resonance capacitance being connected to a respective one of the rectifier circuit arrangements in such a manner that the bipolar direct output voltage is provided, a voltage boosting circuit arrangement being connected to each resonance capacitance and to the rectifier circuit arrangement.

DC/DC converter

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

On an inverter for feeding power of a direct voltage source, in particular of a photovoltaic generator (PVG), into an alternating voltage mains (N), with an asymmetrically clocked bridge circuit with at least two first switches (S, S) clocked at mains frequency and with at least two second switches (S, S) clocked at a higher clock frequency, the efficiency is intended to be improved at low cost. This is achieved in that slow speed switches (S, S) of equal temperature stability are utilized for the mains frequency and that fast speed switches (S, S) with steeper switching slopes and higher temperature stability are utilized for the higher clock frequency, the fast speed switches (S, S) being locally separated from the slow speed switches (S, S).

Inverter with asymmetric clocking and thermally isolated modules

An inverter () for a grounded direct voltage source, in particular for a photovoltaic generator (), a battery or a fuel cell, for converting the direct voltage into an alternative voltage with a DC-DC converter () and a pulse inverter that is supplied by said DC-DC converter (), said DC-DC converter () being configured to be an oscillating circuit inverter and comprising a series resonant oscillating circuit, said DC-DC converter (), which is configured to be an oscillating circuit inverter, being configured to be a series-compensated oscillating circuit inverter with a choke (L) and a series-mounted capacitor array consisting of two or several oscillating circuit capacitors, a rectifier bridge branch including 2 diodes (D, D; D, D, . . . ), being connected to each of the partial oscillating circuit capacitors, said rectifier bridge branch being connected with its positive or its negative pole to output side intermediate circuit capacitors which are preferably connected in series so that said DC-DC converter () delivers at least two bipolar output voltages and is combined with the pulse inverter () with a divided voltage intermediate circuit that is supplied from the oscillating circuit inverter.

Inverter for grounded direct current source, more specifically for a photovoltaic generator

An inverter () for feeding electric power into a utility grid () or into a load is described. The inverter () contains two direct voltage inputs (), one first intermediate circuit () connected thereto and comprising two series connected capacitors (C, C) that are connected together at a ground terminal (), two alternating voltage outputs () of which one at least is provided with a grid choke (L) and one bridge section (). In accordance with the invention, a second intermediate circuit () that is devised at least for selectively boosting the direct voltage and is intended for supplying the bridge section () with positive and negative voltage is interposed between the first intermediate circuit () and the bridge section ().

Inverter

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).

Apparatus for feeding electrical energy into a power grid and DC voltage converter for such an apparatus

An inverter () for feeding electric power into a utility grid () or into a load is described. The inverter () contains direct voltage inputs (), one first intermediate circuit () connected thereto and comprising two series connected capacitors (C, C) that are connected together at a ground terminal (), two alternating voltage outputs () of which one at least is provided with a grid choke (L) and one bridge section (). In accordance with the invention, the inverter () contains only two switches (S, S), which are disposed in the bridge section () and are to be switched at high frequency, as well as, between the first intermediate circuit () and the bridge section (), a second intermediate circuit () that is devised at least for selectively boosting or bucking the direct voltage and intended for supplying said bridge section () with positive and negative voltage, said second intermediate circuit comprising an internal freewheeling (D, D) for maintaining the currents flowing through the grid choke (L) in opposite directions.

Growing community of inventors

Kassel, Germany

Peter Zacharias