Comparative study of linear and non-linear integrated control schemes applied to a Buck converter for mobile applications

Priewasser, Robert; Agostinelli, Matteo; Marsili, S.; Straeussnigg, Dietmar; Huemer, Mario

doi:10.1007/s00502-010-0705-6

Cited by 6 publications

(3 citation statements)

References 12 publications

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“…In power electronics, DC-DC power converters are essential components in both industrial and day-to-day applications, for instance, fuel and photovoltaic cells [ 1 , 2 ], hybrid vehicles [ 3 ], mobile devices [ 4 , 5 ], and many others (see [ 6 ] for a review on recent applications).…”

Section: Introductionmentioning

confidence: 99%

Single-Switching Reachable Operation Points in a DC-DC Buck Converter: An Approximation from Time Optimal Control

2020

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In this paper, we study the time optimal control problem in a DC-DC buck converter in the underdamped oscillatory regime. In particular, we derive analytic expressions for the admissible regions in the state space, satisfying the condition that every point within the region is reachable in optimal time with a single switching action. We then make use of the general result to establish the minimum and maximum variation allowed to the load in two predefined design set-ups that fulfills the time optimal single switching criteria. Finally, we make use of numerical simulations to show the performance of the proposed control under changes in the reference voltage and load resistance.

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Section: Introductionmentioning

confidence: 99%

Single-Switching Reachable Operation Points in a DC-DC Buck Converter: An Approximation from Time Optimal Control

2020

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“…Digital Object Identifier 10.1109/TPEL.2013.2248751 sentation of the circuit, it has a simple design procedure, and it is robust in parameter variations [3], [5]. Following the trend of digital realizations, some of the strong points for SMC are weakened.…”

Section: Introductionmentioning

confidence: 99%

Modeling, Control, and Implementation of DC–DC Converters for Variable Frequency Operation

Priewasser

Agostinelli

Unterrieder

et al. 2014

IEEE Trans. Power Electron.

130

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In this paper, novel small-signal averaged models for dc-dc converters operating at variable switching frequency are derived. This is achieved by separately considering the on-time and the off-time of the switching period. The derivation is shown in detail for a synchronous buck converter and the model for a boost converter is also presented. The model for the buck converter is then used for the design of two digital feedback controllers, which exploit the additional insight in the converter dynamics. First, a digital multiloop PID controller is implemented, where the design is based on loop-shaping of the proposed frequency-domain transfer functions. And second, the design and the implementation of a digital LQG state-feedback controller, based on the proposed time-domain state-space model, is presented for the same converter topology. Experimental results are given for the digital multiloop PID controller integrated on an application-specified integrated circuit in a 0.13 μm CMOS technology, as well as for the statefeedback controller implemented on an FPGA. Tight output voltage regulation and an excellent dynamic performance is achieved, as the dynamics of the converter under variable frequency operation are considered during the design of both implementations.

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“…In the field of point-of-load (PoL) converters, more and more digital controller implementations are emerging, since they are capable of realising configurable and high performance control algorithms [1][2][3][4]. Furthermore, digital CMOS implementations inherently profit from technology scaling, besides the significant advantage that such circuits can be easily incorporated in complex system-on-chip (SoC) solutions.…”

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confidence: 99%

Digital controller design for point-of-load DC-DC converters with variable switching frequency

et al. 2011

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Presented is a digital controller to regulate a point-of-load Buck converter. The regulator varies both the duty cycle, as well as the switching frequency, by controlling not only the on-time, but also the off-time of the switching period. The multi-loop digital controller, which achieves a tight voltage regulation and an excellent dynamic performance, is presented and its effectiveness is proven by means of experimental results. The controller architecture, together with an analogue-todigital converter, has been integrated in a 0.13 mm CMOS technology.Introduction: Regulation techniques for power-management units (PMUs) are gaining more and more importance in the research community, as well as for industrial products. In the field of point-of-load (PoL) converters, more and more digital controller implementations are emerging, since they are capable of realising configurable and high performance control algorithms [1][2][3][4]. Furthermore, digital CMOS implementations inherently profit from technology scaling, besides the significant advantage that such circuits can be easily incorporated in complex system-on-chip (SoC) solutions.In this Letter, a novel voltage-mode controller architecture, which has been implemented in a 0.13 mm CMOS technology, is presented. The controller regulates both the on-phase time and the switching frequency of the digital pulse-width modulated (DPWM) signal. The former is contolled by a classical proportional-integral-derivative (PID) structure. The switching frequency is appropriately chosen by a second, faster control loop. This ensures a tighter voltage regulation and avoids overreaction of the PID controller.

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Comparative study of linear and non-linear integrated control schemes applied to a Buck converter for mobile applications

Cited by 6 publications

References 12 publications

Single-Switching Reachable Operation Points in a DC-DC Buck Converter: An Approximation from Time Optimal Control

Single-Switching Reachable Operation Points in a DC-DC Buck Converter: An Approximation from Time Optimal Control

Modeling, Control, and Implementation of DC–DC Converters for Variable Frequency Operation

Digital controller design for point-of-load DC-DC converters with variable switching frequency

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