Improved short-circuit protection for DC/AC power converters

Details Improved short-circuit protection for DC/AC power converters Improved short-circuit protection for DC/AC power converters

1991-11-04

1992-12-29

Beha, Jr., William H.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 56, 363136, H02M 7122

Patent

active

051756765

ABSTRACT:
This invention consists of a power conversion device wherein a circuit comprising semiconductor power elements and fuses connected in series with these, and feedback diodes connected in antiparallel with said semiconductor power elements is connected as a bridge, the A.C. terminals of said bridge circuit are connected to an A.C. power source, and the D.C. terminals are connected to a D.C. power source provided with a capacitor, characterized in that said feedback diodes are connected in antiparallel with the series circuits of said semiconductor power elements and fuses.
By means of the layout described above, the fuses are prevented from melting when a D.C. short-circuit occurs, since the current that flows from the A.C. terminal to the D.C. power source on D.C. short-circuiting flows through a feedback diode or a bypass diode, and not to the fuses.

REFERENCES:
patent: 4488200 (1984-12-01), Matsuzaki
patent: 4733146 (1988-03-01), Hamby
patent: 4745513 (1988-05-01), McMurray
patent: 5123746 (1992-06-01), Okado

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