DCDC converter voltage control method in case of discontinuous current

The invention discloses a DCDC converter voltage control method in discontinuous current, and the key point of the method is that when inductive current is discontinuous, voltage closed-loop control parameters should follow the following points: 1) a transfer function zero point of a PI controller is determined by a transfer function of a DCDC converter small signal model; (2) the proportionality coefficient of the PI controller after switching is kept consistent with that before switching, and current impact caused by sudden change of control voltage is prevented; and 3) an integral coefficient of the PI controller after switching is determined by a proportionality coefficient and a zero point. According to the invention, when the load is small and the inductive current is discontinuous, the voltage fluctuation is controlled to be greatly improved by using the voltage control parameters when the current is discontinuous; and after continuous and discontinuous switching of the inductive current, the proportio