Nonlinear current controller applied to switching power supply

The invention discloses a non-linear current controller applied to a switching power supply, which comprises a main power circuit and a non-linear control circuit, and the non-linear control circuit is used for controlling the output voltage by sampling the output current, the output voltage and the inductive element current in the main power circuit. Compared with a traditional peak current controller, the nonlinear controller provided by the invention performs double sampling on load current and inductive current, and a voltage outer loop contains load current information, so that the transient response performance of the system during load change can be remarkably accelerated. And the response speed of the system can be further improved by adopting a nonlinear controller. Compared with a traditional current control method, the controller provided by the invention is not limited by bandwidth, subharmonic oscillation can be suppressed without slope compensation, and the control method provided by the inventi