基于自适应斜坡补偿的双环电流模DC/DC混沌控制

提出了一种自适应斜坡补偿方法,将该方法引入到双环电流模buckDC/DC的混沌控制中,并给出实现该方法的电路结构.建立了双环电流模DC/DC系统稳定性分析的离散模型,理论分析了自适应斜坡补偿在双环控制下系统的稳定性条件,推导出了自适应因子k与系统工作的最大占空比的关系式.仿真结果表明该方法可有效控制系统的分岔和混沌现象,提高系统的工作范围和动态响应速度.

Control of chaos in double-loop current-mode DC/DC based on adaptive slope compensation

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.