DC / DC converter and method for controlling a soft-switching DC / DC converter.

摘要

A DC / DC converter according to the invention in the form of a step-down converter, step-up converter or inverter has a converter inductance (L) and an inductance short-circuit switch (Q3, Q4, D3, D4) which is connected in parallel to the converter inductance (L). The inductance short-circuit switch (Q3, Q4, D3, D4) can be controlled separately according to current directions. In a method according to the invention for operating the DC / DC converter, a time interval during which the inductance short-circuiting switch (Q3, Q4, D3, D4) is switched on is varied by a period duration or a switching frequency with which the DC / DC converter operates is going to keep, at least approximately constant. The switching operations are controlled in such a way that soft switching processes ("soft switching") result for all switching elements (Q1, Q2, Q3, Q4).