PROTECTION SCHEME FOR POWER CONVERTERS UTILIZING CASCADED BIPOLAR AND UNIPOLAR POWER SEMICONDUCTOR DEVICES

A protection circuit for a power converter with cascaded bipolar and/or unipolar semiconductors is provided.The protection circuit comprises at least one comparator circuit which is adapted to monitor a voltage characteristic on a collector-emitter path of at least one semiconductor which is arrange...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	Canales, Francisco, Pettersson, Sami, Schweizer, Mario, Park, Ki-Bum
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS CONTROL OR REGULATION THEREOF CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY GENERATION
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Beschreibung
Zusammenfassung:	A protection circuit for a power converter with cascaded bipolar and/or unipolar semiconductors is provided.The protection circuit comprises at least one comparator circuit which is adapted to monitor a voltage characteristic on a collector-emitter path of at least one semiconductor which is arranged in a polarity selection stage of the power converter and/or to monitor a voltage characteristic on at least one capacitor, which is arranged in the power converter.The at least one comparator circuit is further adapted to output an electrical signal, representing the voltage characteristic of the semiconductor and/or the at least one capacitor to at least one evaluation unit. The at least one evaluation unit is further adapted to evaluate the result from the at least one comparator circuit and to deactivate the semiconductors in case that the voltage characteristic of the semiconductors and/or the capacitors deviate from a predetermined threshold.