Inverter apparatus and method of operation therefor

Details Inverter apparatus and method of operation therefor Inverter apparatus and method of operation therefor

1994-03-29

1997-03-25

Wong, Peter S.

Electric power conversion systems

Current conversion

Using semiconductor-type converter

363 37, 318810, H02M 3335

Patent

active

056151020

ABSTRACT:
An inverter apparatus for driving a three-phase AC motor, having first and second arms each comprising plural parallel-connected transistors and plural parallel-connected diodes, is protected against overheating by detecting the composite current of the transistors and the composite current of the diodes in one of the first and second arms and determining the larger of the currents. The larger current, offering greater accuracy, is used to control the inverter. The apparatus is operative in either the regenerative or driving mode. Alternatively, a single detector can be used but the signal waves are clamped below a reference wave value.

REFERENCES:
patent: 4291265 (1981-09-01), Kawada et al.
patent: 4513362 (1985-04-01), Aizawa
patent: 4772996 (1988-09-01), Hanei et al.
patent: 4788485 (1988-11-01), Kawagishi et al.
patent: 5072354 (1988-12-01), Katto et al.

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