Southeast University

Weiwei Zhai

Longxing Shi

Weifeng Sun

Qinsong Qian

Qi Liu

Leilei Shi

A control method for a four-switch buck-boost converter is provided. The control method adopts four-stage control, and divides the load range into two sections and adopts different control strategies according to a critical load value corresponding to optimal control. In Boost mode, before the critical load, Tand Tare kept constant, Tis a minimum value for realizing soft-switching, and Tdecreases with the increase of the load; when the critical load is reached, Tdrops to 0; and after the critical load, T, T, Tand T increase with the load. In Buck mode, before the critical load, Tand Tare kept constant, Tis a minimum value for realizing soft-switching, and Tdecreases with the increase of the load; when the critical load is reached, Tdrops to 0; and after the critical load, T, T, Tand T increase with the load.

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Nanjing, China

Weiwei Zhai