Complete digital control method for PWM DCDC boost converter

Kranz, C.

doi:10.1109/pesc.2003.1218183

Cited by 24 publications

(9 citation statements)

References 2 publications

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“…Various performance or system gains using digital control of high-frequency switched-mode power supplies (SMPS) have recently received increased attention [1][2][3][4][5]. In this paper, we focus on an important practical problem in the design and deployment of point-of-load (POL) converters: the impedance of the capacitive load is often unknown at design time, and can furthermore vary significantly due to component tolerances or temperature variations.…”

Section: Introductionmentioning

confidence: 99%

Autotuning techniques for digitally-controlled point-of-load converters with wide range of capacitive loads

Shirazi

Zane

Maksimović

et al. 2007

APEC 07 - Twenty-Second Annual IEEE Applied Power Electronics Conference and Exposition

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Abstract-This paper addresses auto-tuning of digital controllers for point-of-load (POL) switching converters with wide range of capacitive loads. Two auto-tuning methods are considered with particular attention given to robustness and feasibility. The first method is derived from the well known relay-feedback autotuning technique, where specific frequencies are excited to gain information on the power stage. In the second, system-identification based method, compensator parameters are computed based on on-line identification of the power stage frequency response. The tuning techniques proposed in this paper have been specifically developed to handle wide capacitance and ESR range, and important extensions of the basic algorithms are implemented in order to face practical issues such as limit cycling conditions, output voltage tolerance specification, closed-loop bandwidth maximization and phase margin constraints. Simulation and experimental results on a 12-to-1.5 V, 9 A, 200 kHz POL converter are provided to show the effectiveness and to compare the considered techniques. I. INTRODUCTIONVarious performance or system gains using digital control of high-frequency switched-mode power supplies (SMPS) have recently received increased attention [1][2][3][4][5]. In this paper, we focus on an important practical problem in the design and deployment of point-of-load (POL) converters: the impedance of the capacitive load is often unknown at design time, and can furthermore vary significantly due to component tolerances or temperature variations. Given very wide powerstage variations, standard analog-controlled POL converters may require manual re-design or re-tuning at the time of deployment, or accept penalties in closed-loop dynamic responses in order to meet acceptable stability margins. In a digitally controlled converter, a block diagram of which is shown in Fig. 1, a key advantage is the possibility of autotuning the controller parameters to adapt to the specific power stage. Efficient and robust implementation of digital regulators with embedded tuning capabilities could be a significant breakthrough for digital control in power electronics. The purpose of this paper is to describe the operation, implementation, experimental performance results and comparison of two techniques addressing autotuning for POL converters with wide range of capacitive loads: (1) a relay-based autotuning method based on [6][7][8][9][10][11][12], and (2) an auto-tuning method based on system-identification (system-ID) techniques [13][14][15][16]. Autotuning objectives and the design space are introduced in Section II. Sections III and IV describe application of the two autotuning techniques along with experimental results. Section V discusses the effectiveness of each of the autotuning methods, and conclusions are presented in Section VI. Figure 1 shows a synchronous buck point-of-load converter with a voltage-mode digital controller. In the power stage, we can assume that nominal values of the input voltage V in and the filter inductan...

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Section: Introductionmentioning

confidence: 99%

Autotuning techniques for digitally-controlled point-of-load converters with wide range of capacitive loads

Shirazi

Zane

Maksimović

et al. 2007

APEC 07 - Twenty-Second Annual IEEE Applied Power Electronics Conference and Exposition

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“…Different capacity and topology of DC microgrids lead to the difference in control strategy for DC-DC converters of power storages. The dual-loop constant voltage control is one of schemes for the stable operation of DC microgrids on islanded operation mode [10,11].…”

Section: Introductionmentioning

confidence: 99%

A Feed-Forward Control Realizing Fast Response for Three-Branch Interleaved DC-DC Converter in DC Microgrid

et al. 2016

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It is a common practice for storage batteries to be connected to DC microgrid buses through DC-DC converters for voltage support on islanded operation mode. A feed-forward control based dual-loop constant voltage PI control for three-branch interleaved DC-DC converters (TIDC) is proposed for storage batteries in DC microgrids. The working principle of TIDC is analyzed, and the factors influencing the response rate based on the dual-loop constant voltage control for TIDC are discussed, and then the method of feed-forward control for TIDC is studied to improve the response rate for load changing. A prototype of the TIDC is developed and an experimental platform is built. The experiment results show that DC bus voltage sags or swells caused by load changing can be reduced and the time for voltage recovery can be decreased significantly with the proposed feed-forward control.

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“…Integrated digital controllers for Switch-Mode Power Supplies (SMPS) are gaining growing interest, since it has been shown the feasibility of digital controller ICs specifically developed for high-frequency switching converters [1][2][3][4]. One very interesting potential benefit is the use of autotuning of controller parameters, so that the dynamic response can be set at the software level, independently of output capacitor filters, component variations and aging.…”

Section: Introductionmentioning

confidence: 99%

Autotuning of Digitally Controlled Buck Converters Based on Relay Feedback

Stefanutti

Mattavelli

Saggini

et al.

IEEE 36th Conference on Power Electronics Specialists, 2005.

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This paper proposes a simple autotuning technique for digitally controlled dc-dc synchronous buck converters. The proposed approach is based on the relay feedback method and introduces perturbations on the output voltage during converter soft-start. By using an iterative procedure, the tuning of PID parameters is obtained directly by including the controller in the relay feedback and by adjusting the controller parameters based on the specified phase margin and control loop bandwidth. A nice property of the proposed solution is that output voltage perturbations are introduced while maintaining the closed-loop control of the digitally controlled converters. The proposed algorithm is simple, requires small tuning times and it is compliant with the cost/complexity constraint of integrated digital ICs. Experimental investigation has been performed using discrete components, implementing the digital control in a Field Programmable Gate Array (FPGA). Simulation and experimental results of a 1.5V -5 A synchronous buck converter confirm the effectiveness of the proposed solution.

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Complete digital control method for PWM DCDC boost converter

Cited by 24 publications

References 2 publications

Autotuning techniques for digitally-controlled point-of-load converters with wide range of capacitive loads

Autotuning techniques for digitally-controlled point-of-load converters with wide range of capacitive loads

A Feed-Forward Control Realizing Fast Response for Three-Branch Interleaved DC-DC Converter in DC Microgrid

Autotuning of Digitally Controlled Buck Converters Based on Relay Feedback

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