Inverter bridge short-circuit protection scheme
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United States of America Patent
Stats
-
Mar 4, 2008
Grant Date -
Nov 2, 2006
app pub date -
Apr 9, 2004
filing date -
Apr 9, 2004
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A fault handling system for short circuit recovery in three-phase multiple-level inverter bridges, used to drive inductive loads, to assure a proper sequence for turning-off switches in the inverter bridge. Switches are selected for use in the inverter bridge so that outer switches toward the most positive and most negative bus voltage levels of the inverter bridge have lower transconductances than inner switches closest to an output phase of the inverter bridge. Additionally, driver cards driving outer switches utilize lower magnitude excitation control signals than driver cards driving inner switches. Driver cards driving outer switches, when detecting desaturation of an on-state switch, are set to automatically command the outer switch to an off-state, whereas driver cards driving inner switches wait for instructions from a controller before taking action.
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