CIRCUIT FOR BLOCKING A SEMICONDUCTOR SWITCHING DEVICE ON OVERCURRENT

A conventional circuit for blocking a semiconductor switching device (7) on overcurrent, the semiconductor switching device (7) having at least one continuously driven semiconductor switch (9), comprises a driver circuit (11), which has a driver stage (12) for each semiconductor switch (9), a contro...

Ausführliche Beschreibung

Gespeichert in:

Bibliographische Detailangaben
1. Verfasser:	JAEGER, JENS, ULRIK
Format:	Patent
Sprache:	eng ; fre
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 EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS GENERATION
Online-Zugang:	Volltext bestellen
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

Beschreibung
Zusammenfassung:	A conventional circuit for blocking a semiconductor switching device (7) on overcurrent, the semiconductor switching device (7) having at least one continuously driven semiconductor switch (9), comprises a driver circuit (11), which has a driver stage (12) for each semiconductor switch (9), a control pulse generator (10) for producing control pulses (P1 to P6), which are fed in operation to a control input of the semiconductor switching device (7) via the driver circuit (11), and a monitoring device (34), which measures the current (I) flowing through the semiconductor switching device (7) and, when an overcurrent occurs, generates a fault signal (E), which initiates blocking of the semiconductor switching device (7). When the semiconductor switching device is being blocked, a high overvoltage can occur therein, possibly leading to destruction of the semiconductor switching device. In order to reduce, with little outlay, the overvoltage in the semiconductor switching device during blocking thereof, provision is made such that the operating voltage (U) of the driver circuit (11) is arranged to be switched over briefly by the fault signal to a lower, interim value corresponding to a lower current (I) through the semiconductor switching device (7) and then, within the maximum permissible duration for loading the semiconductor switching device (7) with an overcurrent, to be switched off completely. Un circuit classique de blocage d'un dispositif (7) de commutation à semiconducteur lors d'une surtension, le dispositif (7) de commutation à semiconducteur présentant au moins un commutateur (9) à semiconducteur excité en continu, comprend un circuit d'attaque (11), lequel comporte un étage d'attaque (12) pour chaque commutateur (9) à semiconducteur, un générateur (10) d'impulsions de commande destiné à produire des impulsions de commande (P1 à P6), lesquelles sont transmises, lors du fonctionnement, à une entrée de commande du dispositif (7) de commutation à semiconducteur par le circuit d'attaque (11), et un dispositif de contrôle (34), lequel mesure le courant (I) passant dans le dispositif (7) de commutation à semiconducteur et, lorsqu'une surtention se produit, génère un signal d'anomalie (E), lequel déclenche le blocage du dispositif (7) de commutation à semiconducteur. Lorsque le dispositif de commutation à semiconducteur est bloqué, une surtension élevée peut s'y produire, pouvant conduire à la destruction du dispositif de commutation à semiconducteur. Afin