A control method of a DC/DC converter , the DC/DC converter comprising a first capacitor (C 1 ) and a second capacitor (C 2 ) coupled to a first node (N1), a second end of the first capacitor being coupled to a second node (N2), and a second end of the second capacitor being coupled to a third node (N3); a first bridge arm coupled between the first node and the second node and a second bridge arm coupled between the first node and the third node, the first bridge arm comprising a first switch (S1) and a second switch (S2) coupled to a fourth node (A), the second bridge arm comprising a third switch (S3) and a fourth switch (S4) coupled to a fifth node (B); a transformer having a primary winding electrically connected to the fourth node and the fifth node, and a secondary side circuit electrically connected to a secondary winding of the transformer, wherein the method comprises: outputting a first control signal, a second control signal, a third control signal, and a fourth control signal to control ends of the first switch, the second switch, the third switch, and the fourth switch, wherein the first control signal, the second control signal, the third control signal, and the fourth control signal are square wave signals having a preset period, the first control signal is complementary to the second control signal, the third control signal is complementary to the fourth control signal, a first phase shift angle exists between the first control signal and the fourth control signal, and the first phase shift angle exists between the second control signal and the third control signal; characterized in that , the method further comprises: controlling the first phase shift angle to reduce a voltage difference between the first capacitor and the second capacitor, wherein when the first phase shift angle is positive, current is always in a direction of flowing out of the first node (N1) in one switching period; when the first phase shift angle is negative, the current is always in a direction of flowing into the first node (N1) in one switching period, and wherein the first phase shift angle is positive when conduction of the fourth switch lags conduction of the first switch, and the first phase shift angle is negative when conduction of the fourth switch is ahead of conduction of the first switch. outputting a first control signal, a second control signal, a third control signal, and a fourth control signal to control ends of the first switch, the second switch, the third switch, and the fourth switch, wherein the first control signal, the second control signal, the third control signal, and the fourth control signal are square wave signals having a preset period, the first control signal is complementary to the second control signal, the third control signal is complementary to the fourth control signal, a first phase shift angle exists between the first control signal and the fourth control signal, and the first phase shift angle exists between the second control signal and the third control signal; characterized in that , the method further comprises: controlling the first phase shift angle to reduce a voltage difference between the first capacitor and the second capacitor, wherein when the first phase shift angle is positive, current is always in a direction of flowing out of the first node (N1) in one switching period; when the first phase shift angle is negative, the current is always in a direction of flowing into the first node (N1) in one switching period, and wherein the first phase shift angle is positive when conduction of the fourth switch lags conduction of the first switch, and the first phase shift angle is negative when conduction of the fourth switch is ahead of conduction of the first switch. <EOS>