Inverter for grounded direct current source, more specifically for a photovoltaic generator
First Claim
1. An inverter for a grounded direct voltage source, for converting the direct voltage into an alternating 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, wherein said DC-DC converter is configured to be a series-compensated oscillating circuit inverter with a choke and a series-connected capacitor array comprising two or more oscillating circuit capacitors, a rectifier bridge branch including two diodes, is connected to each of the oscillating circuit capacitors, said rectifier bridge branch being connected with its positive or its negative pole to output side intermediate circuit capacitors which are connected in series so that said DC-DC converter delivers at least two bipolar output voltages such that the DC-DC converter is connected to a pulse inverter by a divided voltage intermediate circuit that is supplied from the oscillating circuit inverter.
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Accused Products
Abstract
An inverter (1) for a grounded direct voltage source, in particular for a photovoltaic generator (2), a battery or a fuel cell, for converting the direct voltage into an alternative voltage with a DC-DC converter (3) and a pulse inverter that is supplied by said DC-DC converter (3), said DC-DC converter (3) being configured to be an oscillating circuit inverter and comprising a series resonant oscillating circuit, said DC-DC converter (3), which is configured to be an oscillating circuit inverter, being configured to be a series-compensated oscillating circuit inverter with a choke (L1) and a series-mounted capacitor array consisting of two or several oscillating circuit capacitors, a rectifier bridge branch including 2 diodes (D3, D4; D5, D6, . . . ), 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 (3) delivers at least two bipolar output voltages and is combined with the pulse inverter (4) with a divided voltage intermediate circuit that is supplied from the oscillating circuit inverter.
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Citations
17 Claims
- 1. An inverter for a grounded direct voltage source, for converting the direct voltage into an alternating 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, wherein said DC-DC converter is configured to be a series-compensated oscillating circuit inverter with a choke and a series-connected capacitor array comprising two or more oscillating circuit capacitors, a rectifier bridge branch including two diodes, is connected to each of the oscillating circuit capacitors, said rectifier bridge branch being connected with its positive or its negative pole to output side intermediate circuit capacitors which are connected in series so that said DC-DC converter delivers at least two bipolar output voltages such that the DC-DC converter is connected to a pulse inverter by a divided voltage intermediate circuit that is supplied from the oscillating circuit inverter.
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8. A DC-DC converter having input terminals, output terminals, and an output ground terminal, comprising:
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a pair of series-connected switches connected between the input terminals of the DC-DC converter, wherein a first switch and a second switch of the pair are configured to open and close in an alternating fashion opposite one another; a series resonant oscillating circuit having an input connected to a midpoint connection of the pair of series-connected switches, and having two outputs; a first rectifier circuit coupled to a first of the two outputs of the series resonant oscillating circuit, and a second rectifier circuit coupled to a second of the two outputs of the series resonant oscillating circuit, wherein the first and second rectifier circuits couple together at a midpoint that is coupled to the output ground terminal of the DC-DC converter; an intermediate circuit comprising two series-connected capacitors connected between the output terminals of the DC-DC converter and in parallel with a combination of the first and second rectifier circuits, wherein the two series-connected capacitors of the intermediate circuit connect at a midpoint that is connected to the output ground terminal of the DC-DC converter.
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9. An inverter configured to be coupled to a grounded direct voltage source, comprising:
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a DC-DC converter comprising input terminals configured to couple to respective poles of the grounded direct voltage source, and comprising output terminals having symmetrical outputs with respect to an output ground terminal; a DC-AC converter comprising input terminals coupled to the output terminals of the DC-DC converter, and comprising output terminals configured to be coupled to a grid, wherein one of the output terminals of the DC-AC converter is coupled to the output ground terminal of the DC-DC converter, wherein the output ground terminal of the DC-DC converter is coupled to one of the input terminals of the DC-DC converter or to an internal node of the DC-DC converter associated with a buffer capacitance therein, wherein the output terminals are symmetrical about the internal node. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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Specification