Method for protecting a high-performance power converter and a protection arrangement for executing the method
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United States of America Patent
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Oct 17, 2000
Grant Date -
N/A
app pub date -
Aug 9, 1999
filing date -
Aug 10, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for protecting a high-performance power converter. The high-performance power converter comprises a mains power converter, which converts an alternating voltage from a mains power supply into a direct voltage and supplies the direct voltage to an intermediate direct voltage circuit. The intermediate direct voltage circuit is equipped with an intermediate circuit capacitor, and includes a second power converter which converts the direct voltage from the intermediate direct voltage circuit into an alternating voltage, whereby each of the mains power converter and the second power converter is set up as a bridge circuit and each contains a number of IGBTs (Insulated Gate Bipolar Transistors) arranged in pairs in bridge arms. Protection against destruction is achieved in that, when a destructive discharge of the intermediate circuit capacitor via one of the bridge arms, which has become unintentionally continuously conductive, other bridge arms in the power converters are specifically switched through by way of a relief break-through in order to limit the destruction.
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