This study presents a model following average-current-mode (MFACM) control using a 1/∛s compensator to improve robustness and dynamic response for multiphase boost converters. The proposed 1/∛s compensator can maintain a constant phase boost of about 60° over two decades, which is attractive from the point of view of stability design when phase margin, gain margin, delay margin and modulus margin are taken into consideration. In addition, the MFACM control is shown to elevate perturbation rejection ability of converters by reducing closed-loop output impedance and closed-loop audio susceptibility, relative to traditional average-current-mode control methods with the almost same crossover frequency. Computer simulations and experimental results using a three-phase interleaved boost converter are shown close agreement between modelled estimates and measured values.

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Model following average-current-mode control with 1/∛s compensator for interleaved boost converters with improved dynamic response

References

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