Electric power conversion systems – Current conversion – Using semiconductor-type converter
Reexamination Certificate
2008-02-08
2009-11-10
Han, Jessica (Department: 2838)
Electric power conversion systems
Current conversion
Using semiconductor-type converter
C363S065000, C323S225000, C323S272000
Reexamination Certificate
active
07616467
ABSTRACT:
In a circuit apparatus for transformerless conversion of an electric direct voltage of a two-pole direct voltage source (1) connected to ground having a first voltage pole (+) and a second voltage pole (−) into an alternating voltage, hazardous capacitive leakage currents are avoided by connecting the direct voltage source (1) to ground and the DC-AC converter (400) is operated at a controlled intermediate circuit voltage, a DC-DC converter stage (300) being connected between the direct voltage source (1) and the DC-AC converter (400), said DC-DC converter stage providing at its output a +/− voltage that is symmetrical with respect to the grounding point, two series-connected capacitors (41, 42) having the same polarity and being connected to ground at their connecting point (V) and controlled are charged by two buck-boost choppers (100, 200) connected one behind the other.
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Han Jessica
SMA Technologie AG
Vigil Thomas R.
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