Clamp diode and capacitive type soft switch full bridge converter and control method thereof

The invention provides a clamp diode and capacitive type soft switch full bridge converter and a control method thereof. A clamp diode D1-D2,a clamp capacitor C and a resonant inductor Lr are added inthe full bridge circuit, the asymmetrical control of the bridge converter makes the control signals of the switch tubes Q1 and Q2 complementary, the control signals of the switch tubes Q3 and Q4 arecomplementary, the control signals of the first and third switch tubes are greater than 0.5, the control signals of the second and fourth switch tubes are less than 0.5, the control signals of the diagonal switch tubes are in central symmetry, and the control signal pulse width of a lower tube is namely a converter duty ratio. The clamp diode and capacitive type soft switch full bridge converter can better perform clamping of the on-off voltage of a secondary rectifier tube, can reduce the loss of the clamp diode and can allow the full bridge converter switch tube to more easily achieve ZVS, and can simplify the contro