Abstract
The method of adaptive slope compensation and its circuit structure are proposed in this paper. With this method, bifurcation and chaos in double-loop current-mode buck DC/DC are controlled with good performance. The discrete model of double-loop current-mode buck DC/DC used in stability analysis is build and the condition for the system operating stably under double-loop control is derived theoretically. Further more, the relationship between the adaptive coefficient k and the maximum duty ratio on which the system will operate stably is derived. The agreement of simulation results with the theoretical analysis shows that adaptive slope compensation can control bifurcation and chaos effectively, and it extends the system working range and improves the dynamic response characteristics.
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