Self-adaptive PI adjusting method based on four-phase staggered DC-DC circuit and converter

The invention discloses a self-adaptive PI adjusting method and converter based on a four-phase staggered DC-DC circuit, and the method comprises the following steps: collecting the battery end voltage and four-phase inductive current of a DC converter, and determining the working mode of the DC converter; determining a control strategy according to the working mode, wherein the control strategy comprises a double-closed-loop PI control strategy and a fuzzy voltage PI outer loop and four-phase inductive current inner loop control strategy; and outputting a duty ratio according to a double-closed-loop PI control strategy or a fuzzy voltage PI outer loop and four-phase inductive current inner loop control strategy to generate a PWM waveform so as to control the on-off of a switching tube in the DC converter. According to the invention, the instantaneous dynamic response and robustness of the DC-DC converter can be effectively improved, and the PI value is adaptively adjusted on line according to different volta