  An alternative approach for minimum and mode-dependent dwell-time
characterization for switched systems is derived. The proposed technique is
related to Lyapunov looped-functionals, a new type of functionals leading to
stability conditions affine in the system matrices, unlike standard results for
minimum dwell-time. These conditions are expressed as infinite-dimensional LMIs
which can be solved using recent polynomial optimization techniques such as
sum-of-squares. The specific structure of the conditions is finally utilized in
order to derive dwell-time stability results for uncertain switched systems.
Several examples illustrate the efficiency of the approach.
