  This paper deals with a class of Resistive-Inductive-Capacitive (RLC)
circuits and switched RLC (s-RLC) circuits modeled in Brayton Moser framework.
For this class of systems, new passivity properties using a Krasovskii's type
Lyapunov function as storage function are presented. Consequently, the
supply-rate is a function of the system states, inputs and their first
time-derivatives. Moreover, after showing the integrability property of the
port-variables, two simple control methodologies called output shaping and
input shaping are proposed for regulating the voltage in RLC and s-RLC
circuits. Global asymptotic convergence to the desired operating point is
theoretically proved for both proposed control methodologies. Moreover,
robustness with respect to load uncertainty is ensured by the input shaping
methodology. The applicability of the proposed methodologies is illustrated by
designing voltage controllers for DC-DC converters and DC networks.
