A circuit includes a capacitive element for coupling across a load element
to be energized by a DC signal, a first sense element to monitor an
instantaneous sum of currents through the load element and the capacitive
element, a switching element to control current through the first sense
element, a second sense element coupled to the switching element to sense
current through the switching element, an energy storage element coupled
to the switching element, a unidirectional current flow element allowing
current flow to the load element, and a converter circuit to control the
switching element, wherein the converter circuit regulates to the current
level monitored across the first sense element, and wherein a converter
regulation loop includes a dominant pole to average the current sensed
through the first sense element.