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Linear small-signal models often fail to capture underlying behavior of a switching power converter, and use of such models cannot fully explore the performance and stability objectives of a proportional-integral-derivative (PID) controller. This paper proposes a nonlinear PID control tuning method in a synchronous buck converter using phase-plane geometry. The capacitor current replaces direct derivative...
This paper highlights performance and efficiency benefits using time optimal control (TOC) in a synchronous buck converter, over an optimally tuned current mode control (CMC) for a step reference transient. An approximate second order closed loop model is obtained for CMC using type-II compensation, and critical performance limits are derived using a normalized framework. Under frequent step change...
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