US 2009/0015071 A1Published application

Power conversion apparatus

AssigneeMitsubishi Electric Corporation

InventorsAkihiko Iwata, Makoto Seto, Masaki Yamada, Shigeki Harada

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Abstract

In a power conversion apparatus that boosts a solar light voltage, converts it to AC and supplies AC power to a load or system, a second inverter is connected in series to one of two terminals on the AC side of a first inverter that uses, as its DC source, a DC voltage boosted from a solar light voltage by a chopper circuit. A third inverter is connected in series to the other terminal. Then, output voltages of the second and third inverters are controlled to be equal, and an output voltage is provided by using the sum of the generated voltages of the first, second, and third inverters. Thus, a mid-point potential of the DC power source is made equivalent to an intermediate potential of the output voltage of the power conversion apparatus, that is, the mid-point potential (ground potential) of a system.

Claims10

Dependent claims

A power conversion apparatus comprising a plurality of single-phase inverters having respective AC and DC sides and that convert DC power from a plurality of DC power sources to AC power, the plurality of single phase inverters being connected in series, wherein

the apparatus produces an output voltage that is a sum of generated voltages from a combination of single-phase inverters selected from the plurality of single-phase inverters,
the plurality of single-phase inverters includes a first inverter having as an input an output voltage produced by a first DC power source producing the highest output voltage of the plurality of DC power sources,
at least one second inverter is connected to a first terminal on the AC side of the first inverter, and
at least one third inverter is connected to a second terminal on the AC side of the first inverter, and
total output voltage of the second inverter is substantially equal to total output voltage of the third inverter.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/816,029Filed 21 Feb 2006
Priority: JP 2005-05069725 Feb 2005
Published: 15 Jan 2009
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

H02M 7/53871
In a bridge configuration: with automatic control of output voltage or current
H02M 7/49
Converters with outputs that each can have more than two voltages levels: combination of the output voltage waveforms of a plurality of converters
H02M 1/0077
Converter structures employing plural converter units, other than for parallel operation of the units on a single load: plural converter units…
H02M
Apparatus for conversion between ac and ac, between ac and dc, or