The proposed soft-switching DC/DC converter includes a converter circuit
including a main switch having a first, a second and a control terminals
for converting an input DC voltage to an output DC voltage, a resonant
circuit electrically connected to the converter circuit, and an energy
transferring circuit including an auxiliary switch having a first, a
second and a control terminals and magnetically coupled to the resonant
circuit. In which, the main switch is turned on under a specific voltage
across the first and the second terminals of the main switch and the
auxiliary switch is turned off under a specific current flowing through
the first and the second terminals of the auxiliary switch both
controlled by the resonant circuit through a resonance effect so as to
accomplish a soft-switching of the converter.