THE METHOD FOR CONVERTING DC(DIRECT CURRENT)-DC, THE DEVICE FOR CONVERTING DC-DC AND THE CIRCUIT FOR CONVERTING DC-DC

摘要

Disclosed are a DC-DC converting method, a DC-DC converting device, and a DC-DC converting circuit. The present invention provides the DC-DC converting method capable of reducing voltage stress between switches based on double step-down. A double step-down DC-DC converting method can comprise: a step in which a double step-down DC-DC converter receives first voltage; and a step in which the double step-down DC-DC converter converts the first voltage into second voltage based on a plurality of operation modes. The double step-down DC-DC converter includes a primary side circuit and a secondary side circuit for voltage converting. The primary side circuit includes a first full bridge circuit connected to a first switch in series. The first full bridge circuit comprises: first and second legs connected to in parallel; and an input voltage line to connect the first and second legs. A double step-down capacitor and a third switch can be formed on the first leg. A second switch and a fourth switch can be formed on the second leg.