Commutation cell, power converter and compensation circuit having dynamically controlled voltage gains
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United States of America Patent
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Jan 30, 2018
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N/A
app pub date -
Nov 12, 2014
filing date -
Nov 14, 2013
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Abstract
A commutation cell is configured for limiting switching overvoltage. The commutation cell includes a power electronic switch having a parasitic emitter inductance through which a voltage is generated upon turning off of the power electronic switch. The commutation cell also includes a dynamically controlled compensation circuit connected to the parasitic emitter inductance. The compensation circuit applies a controllable portion of the voltage generated through the parasitic emitter inductance at turn-off of the power electronic switch to control the voltage generated through the parasitic emitter inductance. A power converter includes a pair of commutation cells and a compensation circuit of the commutation cell.
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