Hybrid circuit using miller effect for protection of electrical

Details Hybrid circuit using miller effect for protection of electrical Hybrid circuit using miller effect for protection of electrical

1995-09-12

1997-07-29

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Arc suppression at switching point

361 2, H02H 300, H01H 930

Patent

active

056526881

ABSTRACT:
An IGBT semiconductor device is connected across switching contacts which are to be protected from arcing. When the contacts are in a normally open configuration, the gate portion of the IGBT is connected to the emitter portion through the contacts, while when the contacts are in a closed configuration, the collector portion of the IGBT is connected to the emitter portion through the contacts. A capacitor is connected in parallel with the gate-collector junction. The combination of the stray collector gate capacitance and the additional capacitor is sufficient to maintain the IGBT device in conduction as the contacts are moving from their closed configuration to their open configuration, thereby preventing arcing across the contacts.

REFERENCES:
patent: 4658320 (1987-04-01), Hongel
patent: 5517378 (1996-05-01), Asplund et al.
patent: 5536980 (1996-07-01), Kawate et al.

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