Referring now to FIG. 2, FIG. 2 shows a first schematic view of a soft-switching auxiliary circuit of the second embodiment in accordance with the present disclosure. As shown in FIG. 2, the soft-switching auxiliary 1 may be applicable to a half-bridge converter 2, which may include a first main switch S1 and a second main switch S2; in other embodiments, the soft-switching auxiliary circuit 1 may be also applicable to other different converters. The soft-switching auxiliary circuit 1 may include a first auxiliary switch 11, a second auxiliary switch 12, a first energy adjustment module 13 and a second energy adjustment module 14.

More specifically, the first auxiliary switch 11 may include a first diode S_a1. The second energy adjustment module 13 may include a first inductor L1, a second inductor L2, a first capacitor C1, a first diode D1 and a second diode D2. The second energy adjustment module 14 may include a third inductor L3, a fourth inductor L4, a second capacitor C2, a third diode D3 and a fourth diode D4. The second auxiliary switch 12 may include a second diode S_a2.

Regarding the first auxiliary switch 11, the first transistor S_a1 may be a bipolar junction transistor (BJT); the collector of the first diode S_a1 may be coupled to a first node N1, and the emitter of the first transistor S_a1 may be coupled to a second node N2.