Electric power conversion systems – Current conversion – With cooling means
Reexamination Certificate
1999-08-25
2001-07-17
Berhane, Adolf Deneke (Department: 2838)
Electric power conversion systems
Current conversion
With cooling means
Reexamination Certificate
active
06262906
ABSTRACT:
FIELD OF THE INVENTION
The present invention concerns an air-cooled power converter with a gate turn-off.
BACKGROUND INFORMATION
Water-cooled megawatt power converters are known. However, conventional power converters are expensive to manufacture and maintain.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a power converter in a capacity range of 1 to 10 MW that can be manufactured more advantageously compared to the conventional power converters. It is particularly desirable that a power converter in the capacity range of 1 to 20 MW be provided, which is easier and less expensive to operate and maintain than conventional power converters.
Air cooling for power converters operating in the range of 1 to 20 MW is considered unsuitable by experts in the field. It has, however, been shown that power converters in the above-mentioned capacity range with air cooling are feasible. Such air-cooled power converters have proven to be particularly cost-effective and require little maintenance compared to known water-cooled power converters.
In an advantageous embodiment of the present invention, heat sinks electrically connect gate turn-off power semiconductors. This electrical connection also represents a good heat connection, so that the heat generated in the power semiconductors is sufficiently dissipated. It has also proven to be advantageous to use heat sinks with such a high heat capacity that they react inertially to peak loads.
In another advantageous embodiment of the present invention, the power converter has a fan that supplies ambient air or pre-cooled air to the heat sinks or that advantageously draws ambient air through the heat sinks.
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Greif Tomas
Muller Hans-Jurgen
Salzmann Theodor
Wokusch Johann
Berhane Adolf Deneke
Kenyon & Kenyon
Siemens Aktiengesellschaft
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