Power inverter snubber circuit

Details Power inverter snubber circuit Power inverter snubber circuit

1991-05-28

1992-07-14

Stephan, Steven L.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 37, 363131, 363134, H02H 7122

Patent

active

051309173

ABSTRACT:
A snubber circuit for a neutral clamped power inverter. The power inverter includes power transistors, a current sensor at the inverter output and a neutral clamping circuit connected between the inverter output and a neutral point in a DC power source which supplies the inverter. A controller circuit is connected to the current sensor, to the power transistors and to the neutral clamping circuit to selectively enable and disable the power transistors and the neutral clamping circuit in accordance with the inverter operation and current direction at the inverter output to minimize current transients at a load. An active snubber arrangement is provided to minimize snubber losses when the power transistors are inactive during alternate positive and negative half-cycles of operation.

REFERENCES:
patent: 4443841 (1984-04-01), Mikami et al.
patent: 4519022 (1985-05-01), Glennon
patent: 4542451 (1985-09-01), Hucker
patent: 4635177 (1987-01-01), Shekhawat et al.
patent: 4651267 (1987-03-01), Nguyen et al.
patent: 4670828 (1987-06-01), Shekhawat et al.
patent: 4862342 (1989-08-01), Dhyanchand et al.
patent: 4961129 (1990-10-01), Shekhawat

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