One end of the first auxiliary switch 11 may be coupled to one end of the first main switch S1 and the positive electrode of the power source P via a first node N1; the other end of the first auxiliary switch 11 may be coupled to one end of the first energy adjustment module 13 via a second node N2.

The other end of the first energy adjustment module 13 may be coupled to one end of the second energy adjustment module 14 via a third node N3; the other end of the first main switch S1 and one end of the second main switch S2 may be coupled to the third node N3.

The other end of the second auxiliary switch 12 may be coupled to the other end of the second main switch S2 via a fifth node N5.

As described above, the embodiment discloses a novel soft-switching auxiliary circuit, which may include two symmetrical auxiliary switches and two symmetrical energy adjustment modules. The two auxiliary switches and two energy adjustment modules can properly store and adjust the energy of the converter, so both the first main switch S1 and the second main switch S2 of the converter 2 can achieve soft-switching; accordingly, the switching loss of the converter 2 can be minimized and the performance of the converter 2 can be significantly improved.