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RCD Snubber Revisited
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2009-11-27
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RCD Snubber Revisited
Stephen J. Finney, Barry W. Williams, and Tim C. Green, Member, IEEE
Abstruct- The use of the polarized RCD turn-off snubber
configuration across switching devices is popular because of its
simplicity and use of only passive components. This configuration
is limited by the fact that all capacitor-stored energy is dissipated
in the discharge resistor.
In this paper it is shown that with the addition of a ferrite
transformer to the standard RCD arrangement, in excess of 70%
of the energy stored on the snubber capacitor may be passively
recovered into the dc supply. Performance of this passive recovery
snubber is supported by theoretical, simulated and practical
results.
Stephen J. Finney, Barry W. Williams, and Tim C. Green, Member, IEEE
Abstruct- The use of the polarized RCD turn-off snubber
configuration across switching devices is popular because of its
simplicity and use of only passive components. This configuration
is limited by the fact that all capacitor-stored energy is dissipated
in the discharge resistor.
In this paper it is shown that with the addition of a ferrite
transformer to the standard RCD arrangement, in excess of 70%
of the energy stored on the snubber capacitor may be passively
recovered into the dc supply. Performance of this passive recovery
snubber is supported by theoretical, simulated and practical
results.
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