并联DC-DC Buck变换器中的一类低频分岔行为分析

parallel-connected DC-DC buck converter is a high non-linear system. In the system, a sort of low-frequency bifurcation behavior is obtained through changing circuit parameters. The paper not only attempts to probe into the mechanisms of the low-frequency bifurcation occurring, but also analysis the low-frequency bifurcation based on an averaged model describing the system in theory. It is shown that, in essence, the low-frequency bifurcation is Hopf bifurcation with border collision and the low-frequency bifurcation can be obtained through the system being structurally changed. Moreover, the structural changes are possibly different for different circuit parameters.