Analysis and current control of fourth-order DC-DC bidirectional converter

摘要

This paper describes the current control of a non-isolated bidirectional dc-dc converter. It is a switched capacitor type fourth-order bidirectional converter (FOBDC). This converter is modeled using state-space modeling technique, and duty ratio-to-inductor current transfer functions is then derived. Two different compensators are designed using the respective transfer functions to achieve an average current mode control (ACMC) during the charging and discharging modes. The compensator(s) performance is evaluated by introducing perturbations. A technique is also developed for smooth mode transitions, charging to discharging and vice-versa, with minimum delay time. A 12-48 V converter is designed, simulated, and experimentally verified for low power applications.