Protective apparatus for inverter

Details Protective apparatus for inverter Protective apparatus for inverter

1987-09-03

1989-08-01

Salce, Patrick R.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363136, H02H 7122

Patent

active

048538353

ABSTRACT:
In an inverter supplied with power from a DC power supply whose voltage rises at a light load operation, if an overcurrent failure occurs at a light load operation at the inverter output side as seen from the DC power supply, a surge voltage higher than a voltage withstanding of the switching elements of the inverter is generated across the elements, the surge voltage being higher by the amount corresponding to a rise in the DC power supply voltage. Therefore, there arises a possibility of breaking the switching elements. This inconvenience can be solved by lowering the overcurrent detection level by the amount corresponding to a rise in the DC voltage, when a light load operation as seen from the DC power supply side is performed.

REFERENCES:
patent: 3683264 (1972-08-01), Schieman et al.
patent: 4231083 (1980-10-01), Matsuda et al.
patent: 4532583 (1985-07-01), Nemoto
patent: 4675799 (1987-06-01), Suzuki et al.

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