Online Closed-Loop Autotuning Digital Controller for Switching Power Converters

Qahouq, Jaber A. Abu; Arikatla, VaraPrasad

doi:10.1109/tie.2012.2190373

Cited by 47 publications

(15 citation statements)

References 33 publications

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“…However, it has feasible operating regions only in the buck converter with resistive load [26], and is therefore not suitable in our application that also requires boost mode operation. The autotuning PWM controllers, which also can be considered for applying to the stimulation system, dynamically adjusts the parameters of the compensation controller based on observing the perturbed test signal [27], [28] or the time-domain characteristics of the compensated error signal [29]. However, achieving a fast transient response at large-signal time-varying reference voltage with linear PWM controllers is a very daunting task [30]- [32], since they are optimized for a specific small-signal operating point.…”

Section: Existing Controllers Considered For the Psm Stimulatormentioning

confidence: 99%

Design and analysis of energy recyclable bidirectional converter with digital controller for multichannel microstimulators

Lee

Law

Bermak

2017

Analog Integr Circ Sig Process

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Abstract-The power supply modulated microstimulator system can drive an expandable electrode array with reduced heat generation across the current drivers and high stimulation efficiency. Although plenty of research efforts have been pour into demonstrating various applications of the power supply modulated microstimulators, a comprehensive analytical modelling of the system to investigate internal and external energy flow during biphasic stimulation pulses spanning over varying loading configurations (e.g. number of electrodes, and stimulation current amplitude) is still lacking. This paper fills the research gap by presenting the systematic tools for attaining insights of a stimulator system featuring a bidirectional DC-DC converter with an algorithmic digital controller. The models employed here are based on traditional analytical methods such as transfer functions and state-space dynamic models incorporating various energy loss circuit elements. With the models, the behaviour and power efficiency under a wide range of parameters associated with stimulator is attained. Numerical assessment reveals that the digital controller can track the output supply voltage at the phase transition boundaries just in tens of switching cycles. The system was also studied on a verification platform, where the internal signals of the digital controller were carefully examined. Measurement results show that the system behavior well matched to the simulation results, demonstrating the effectiveness of the analytical system model for obtaining key insights for generic large-scale micro-stimulator designs.

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Section: Existing Controllers Considered For the Psm Stimulatormentioning

confidence: 99%

Design and analysis of energy recyclable bidirectional converter with digital controller for multichannel microstimulators

Lee

Law

Bermak

2017

Analog Integr Circ Sig Process

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“…This algorithm has stability robustness, efficiency and optimum dynamic response in a very short time period. An online compensator auto-tuning method which tunes the parameters of the compensator has been proposed to achieve optimized dynamic performance in [5]- [6]. In addition, a fast PID method has been presented in [7]- [9].…”

Section: Introductionmentioning

confidence: 99%

An FPGA-Based Modified Adaptive PID Controller for DC/DC Buck Converters

Ling¹,

Chang²,

Zhou³

et al. 2015

Journal of Power Electronics

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On the basis of the conventional PID control algorithm, a modified adaptive PID (MA-PID) control algorithm is presented to improve the steady-state and dynamic performance of closed-loop systems. The proposed method has a straightforward structure without excessively increasing the complexity and cost. It can adaptively adjust the values of the control parameters (K p , K i and K d ) by following a new control law. Simulation results show that the line transient response of the MA-PID is better than that of the adaptive digital PID because the differential coefficient K d is introduced to changes. In addition, experimental results based on a FPGA indicate that the MA-PID control algorithm reduces the recovery time by 62.5% in response to a 1V line transient, 50% in response to a 500mA load transient, and 23.6% in response to a steady-state deviation, when compared with the conventional PID control algorithm.

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“…Significant effort has been made to reduce the impact of these issues as well as to eliminate the system identification phase ([12]- [13]). In [12], for example, one of the controller variables, e.g. the gain, is tuned by observing the amplitude and the frequency of the error signal in steady state.…”

Section: Introductionmentioning

confidence: 99%

“…In [13], instead, LMS adaptive filters are used to identify the plant to be compensated and a PD controller is tuned to obtain desired location of system closed-loop poles. Although the proposed auto-tuning processes do not require any perturbation of the plant they still suffer from having a tuning process that brings the closed-loop system at the limit of stability ( [12]) and of having a very long learning phase. Additionally, in all the proposed tuning methods ([4]- [13]) controller parameters are tuned independently thus lengthening the tuning phase.…”

Section: Introductionmentioning

confidence: 99%

Controller scalability methods for digital Point Of Load converters

Meola

Cinti

Kelly³

2015

2015 IEEE Applied Power Electronics Conference and Exposition (APEC)

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Unmodeled dynamics cause DC-DC controller design to be an iterative procedure where controller parameters are tuned and re-tuned to achieve the desired transient performance. Once the controller is designed any change of the output filter requires a new compensator design to guarantee stable operation. In this paper programmability of controller parameters in digital Point Of Load (POL) converters is exploited to investigate methods to scale an existing controller to accommodate variation of the resonant frequency of the LC filter, with the aim to eliminate the need for such iterative tuning. A new method to scale a compensator is then proposed to maintain bandwidth and phase margin of the original controller design. Experimental results are provided for 12-to-1.2V, 20A, 500kHz 0.18µm CMOS digital POL converter to show the effectiveness of the proposed method.

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Online Closed-Loop Autotuning Digital Controller for Switching Power Converters

Cited by 47 publications

References 33 publications

Design and analysis of energy recyclable bidirectional converter with digital controller for multichannel microstimulators

Design and analysis of energy recyclable bidirectional converter with digital controller for multichannel microstimulators

An FPGA-Based Modified Adaptive PID Controller for DC/DC Buck Converters

Controller scalability methods for digital Point Of Load converters

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