A current-mode control, which can be applied to three basic single-inductor dual-output (SIDO) dc-dc converters to suppress cross-regulation, is proposed in this paper. The control circuits and operation principles under different inductor current trends and switch sequences are introduced. The SIDO boost converter operating in continuous conduction mode (CCM) is taken as an example to establish the complete and accurate small-signal model in detail. Based on which, the optimal compensator design is presented. And then, the cross-regulation and transient performance are analyzed via Bode plots, and the SIMPLIS simulation results are presented to validate the small signal model. In addition, the stability condition for current mode controlled CCM SIDO boost converter is studied by using Routh-Hurwitz criterion. Finally, experimental results verify the correctness of the theoretical analysis. The research results indicate that the proposed current-mode control significantly reduces the cross- regulation of SIDO dc-dc converter compared with the existing control schemes.

In this paper, the digital average voltage / digital average current (DAV/DAC) predictive control for switching DC-DC converter is proposed. The advantages of the proposed predictive control technique include no sub-harmonic oscillation in the full range of duty cycle, wide stability range, fast load transient response and realization of overcurrent protection. Taking buck converter in continuous conduction mode (CCM) as an example, the algorithm of DAV/DAC predictive control is analyzed in detail. The sampled-data modeling is performed to explore the stability of DAV/DAC predictive control, by which the stability boundary is obtained. The z-domain small-signal model of DAV/DAC predictive control is also derived to analyze the load transient performance. The analysis results prove that DAV/DAC predictive control is the combined control of the existed digital average voltage (DAV) predictive control and digital average current (DAC) predictive control in previous publications. The stability boundary and transient performance of DAV/DAC controlled buck converter are influenced by the weighted factors of inductor current and output voltage, and a simple design oriented reference about the weighted factors is given in this paper. Finally, the theoretical analysis is verified by simulations and experiments.

Multiphase interleaved DC-DC converters are widely used in power electronics. However, conventional phase-shedding controls for improving efficiency at light load result in uneven thermal stress among phases. In this brief, the digital average current (DAC) predictive control with load current compensation for multiphase interleaved DC-DC converters is investigated. Taking a three-phase interleaved buck converter as an example, the working principle and load transient performance are analyzed. And a rotating phase-shedding strategy is proposed to distribute switching activities concentrated on a few phases at light load to all phases with the fastest shedding speed and minimized output oscillation. The effectiveness of the proposed method is verified experimentally.