Transactions of Nanjing University of Aeronautics & Astronautics
Optimal Control Strategy for Buck Converter Under Successive Load Current Change
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Abstract:
A new control algorithm is presented for digitally controlled dc-dc converters to achieve a fast response under a successive load change. Under the steady state condition, the tight voltage regulation is processed by the conventional digital PID compensator. If the load disturbance is significant, the controller switches to an optimal control scheme. With the integration of the capacitor current, the proposed algorithm predicts the optimal switch over time based on the charge balance control, and the minimal voltage derivation and recovery time are thus achieved when the load current has a successive load change. The method for calculating the optimal switch over time is described, and the implementation of the proposed algorithm with a digital controller is treated in detail. Furthermore, the simulation and experiment results are provided to validate the effectiveness of the approaches.
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Project Supported:
the National Natural Science Foundation of China (51207001); the Anhui Provincial Natural Science Foundation (1308085ME66).
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