DC-DC converter apparatus with in-rush current limitation circuit and corresponding DC-DC conversion method

摘要

A DC-DC boost insulated switching converter apparatus is described, including a transformer (11) in turn including a first winding (12) and a second winding (13) with a lesser number of coils with respect to the first winding (12) and having a central tap (13c), an energy storage reactive circuit (15), in particular an inductor, connected in series between said central tap (13c) and a node (17) to which a continuous input voltage to convert is applied (V1), in particular a battery voltage, a switching network including main switches (M4, M3) to selectively connect respective half-windings (13a, 13b) of said second winding (13) to a fixed voltage reference (16), in particular a ground reference, under the control of respective switching driving signals (Va, Vb), a circuit to limit (P1, P2) an in-rush current in said reactive circuit (15). According to the invention said circuit to limit (P1, P2) an in-rush current in said reactive circuit (15) includes a first circuit branch (P1) and a second circuit branch (P2), each apt to selectively place in electrical connection a respective first (13a) and second half-winding (13b) of said second winding (13) of the transformer (11) with the node (17) to which a continuous input voltage to convert is applied (V1), under the control of respective additional driving signals (Vc, Vd).