Title :
Evaluating the reduction in snubbing with soft-recovery devices and the effect of resistor inductance
Author :
Robinson, F.V.P. ; Williams, B.W.
Author_Institution :
Bath Univ., UK
Abstract :
The effects of current-fall shapes on RC-snubber performance are examined to determine if smaller snubbers that remain tolerant to varying current-fall shapes and durations and give lower power-losses can be used. The effects of component imperfections on RC-snubber performance, the optimization of RC-snubbers with nonabrupt current-falls, the sensitivity of nonabrupt snubbers to current-fall variations, and the energy losses associated with nonabrupt snubbers are discussed. It is shown that finely tuning RC-snubber components to take into account nonabrupt current fall, allows reduced snubber capacitance to be used under certain operating conditions. However, voltage-responses become more sensitive to current-fall shape, diode switching-loss is increased by several orders of magnitude, and there appears to be no significant energy-loss advantage with sinusoidally modulated current.<>
Keywords :
overvoltage protection; RC-snubber performance; current-fall shapes; diode switching-loss; power losses; resistor inductance; soft-recovery devices; voltage-responses; Geometry; Inductance; Integral equations; Light emitting diodes; Manufacturing processes; Resistors; Shape; Snubbers; Switching circuits; Voltage;
Conference_Titel :
Industry Applications Society Annual Meeting, 1990., Conference Record of the 1990 IEEE
Conference_Location :
Seattle, WA, USA
Print_ISBN :
0-87942-553-9
DOI :
10.1109/IAS.1990.152413