Current-mode control is a robust industrial DC-DC power converter control scheme that has been successfully tested, is widely accepted, and is commonly implemented with conventional linear P and PI controllers. The need of more systematic designs with enhanced performance has motivated recent studies with linear and nonlinear advanced techniques, but the rigorous understanding and substantiation of the underlying key robust functioning capability are still lacking. In this paper, a constructive control approach is employed to study the current-mode control problem of a class of DC-DC power converters, yielding a cascade control design methodology with: a robust convergence criterion coupled with a systematic and transparent construction-tuning procedure, a rationale to explain the robust controller functioning, and a unified framework to interpret and compare the proposed controller with the existing conventional and advanced control designs. The implementation and functioning of the proposed control design is illustrated experimentally with a boost converter. * a control design methodology with a robust convergence criterion coupled to a systematic and transparent construction-tuning procedure, * a rationale to explain the robust functioning of CMC, and * a unified framework to look at the existing conventional and advanced control designs.First, a small-signal model of the DCPCs is obtained. This model displays clearly the cascade structure of the duty-ratio-current-voltage signal path, and the non-minimum-phase nature of the output voltage regulation problem for the boost and buck-boost converters. Then, motivated by backstepping design ideas [11][12][13] and using a low-gain/high-gain geometric approach, a robustly convergent cascade (multiloop) controller is built. Subsequently, it is shown that the resulting controller can be realized as a cascade of classical linear PI compensators, which resembles the structure of the CMC used in industry. The corresponding closed-loop dynamics is studied, yielding a robust convergence criterion, exhibiting the limiting
SUMMARYCurrent-mode control is a robust industrial DC-DC power converter control scheme that has been successfully tested, is widely accepted, and is commonly implemented with conventional linear P and PI controllers. The need of more systematic designs with enhanced performance has motivated recent studies with linear and nonlinear advanced techniques, but the rigorous understanding and substantiation of the underlying key robust functioning capability are still lacking. In this paper, a constructive control approach is employed to study the current-mode control problem of a class of DC-DC power converters, yielding a cascade control design methodology with: a robust convergence criterion coupled with a systematic and transparent construction-tuning procedure, a rationale to explain the robust controller functioning, and a unified framework to interpret and compare the proposed controller with the existing conventional and advanced control designs. The implementation and functioning of the proposed control design is illustrated experimentally with a boost converter.
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