Trajectory prediction control for digital control DC–DC converters with fast transient response

A novel trajectory prediction control algorithm for digital control DC–DC converters has been presented in this paper. The proposed trajectory prediction control algorithm can provide an accurate prediction of the duty ratio of the next several switching cycles, so as to overcome the inherent time delay of the digital control loop, and to improve the transient response of digital control DC–DC converters, including load response, line response and reference tracking response. A digital control buck DC–DC converter was implemented to verify the effectiveness of the proposed prediction control algorithm. The recovery time is about 8 μs and 4 μs respectively, when the load current changes from a full load to a 17% load and the input voltage changing between 5 V to 6 V. The fastest reference tracking speed is about 26.7 μs/V.