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US 6,151,234 AGranted
Apparatus for converting a direct current into an alternating current
OwnerHendrik Oldenkampinventor
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OwnerHendrik Oldenkampinventor
Estimating the term…
An apparatus for converting a direct current into an alternating current comprises a direct-current converter having an input and an output, which direct-current converter is continuously controllable, a capacitor, and a control unit for controlling the direct-current converter. The apparatus furthermore comprises a second direct-current converter having an input and an output, wherein the input of the second direct-current converter is connected in parallel to the input of the first direct-current converter and the outputs of the first and the second direct-current converter are connected in series. An unfolding bridge is connected to the series-connected outputs of the direct-current converters, whilst the capacitor is connected to the output of the second direct-current converter. Furthermore, a first switching element is provided for interrupting the series connection and a second switching element is provided for connecting the unfolding bridge to the output of the first direct-current converter in the interrupted state of the series connection. The control unit controls at least the first switching element in dependence on the voltage V.sub.c across the capacitor and the voltage V.sub.abs across the unfolding bridge, in such a manner that the first switching element is opened when V.sub.abs <V.sub.c.
Apparatus for converting a direct current into an alternating current, comprising a direct-current converter having an input and an output, which direct-current converter is continuously controllable, a capacitor, a control unit for controlling the direct-current converter, and an unfolding bridge, wherein a second direct-current converter having an input and an output is provided, the input of the second direct-current converter being connected in parallel to the input of the first direct-current converter and the outputs of the first and the second direct-current converter being connected in series, wherein the unfolding bridge is connected to the series-connected outputs of the direct-current converters and the capacitor is connected to the output of the second direct-current converter, wherein a first switching element is provided for interrupting the series connection and a second switching element is provided for connecting the unfolding bridge to the output of the first direct-current converter in the interrupted state of the series connection, wherein the control unit controls at least the first switching element in dependence on the voltage V.sub.c across the capacitor and the voltage v.sub.abs across the unfolding bridge, in such a manner that the first switching element is opened when V.sub.abs <V.sub.c.
Dependencies are inferred from the claim text.