Near-Time-Optimal Dynamics in PWM DC–DC Converters: Dual-Loop Geometric Control

Many commercial controller implementations for dc-dc converters are based on pulse-width modulation (PWM) and small-signal analysis. Increasing switching frequencies, linked in part to wide bandgap devices, provide the opportunity to increase operating bandwidth and enhance performance. Fast processors and digital signal processing offer new computational techniques for power converter control. Conventional control techniques rarely make full use of operating capability. The objectives of this paper are to present an overview and link to literature on conventional modulation and control techniques for hard-switched dc-dc converters, identify performance limits associated with conventional small-signal-based design, discuss geometric control approaches, and compare strategies for control tuning. The discussion shows how current mode controls have alternative state feedback implementations, and describes unusual opportunities for large-signal control tuning. Considerations for minimum response time are described. Comparisons among tuning methods illustrate how geometric controls can achieve order of magnitude dynamic performance increases. The paper is intended as a baseline tutorial reference for future work on power converter control.

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“…The results in [154] and [158] can also lead to minimum response time. Recent linkages back to modulation in [165] are helpful. Fig.…”

Section: Geometric Tuning Methods For Dc-dc Convertersmentioning

confidence: 99%

“…The perspective is not unique. In [165], several geometric approaches listed lead to minimum-time recovery.…”

Section: B Time Optimal Control In Dc-dc Convertersmentioning

confidence: 99%

A Tutorial and Review Discussion of Modulation, Control and Tuning of High-Performance DC-DC Converters Based on Small-Signal and Large-Signal Approaches

Kapat

Krein

2020

IEEE Open J. Power Electron.

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“…Similar to LQR control, deadbeat control also requires full-state feedback as well as the prediction of the system state variable in the next cycle. Other nonlinear control methods, such as geometric control, can use phase-plane analysis to design the settling time of the PWM DC-DC converter with high precision [12][13][14][15] . In Ref.…”

Section: Introduction1mentioning

confidence: 99%

Time-domain Dynamic-performance-improvement Method for Pulse-width-modulated DC-DC Converters Based on Eigenvalue and Eigenvector Sensitivity

Zhou

Pan

et al. 2023

Chin. J. Electr. Eng.

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For pulse-width modulated (PWM) DC-DC converters, the input voltage fluctuation and load variation in practical applications make it necessary for them to have better dynamic performance to meet the regulation requirements of the system. The dynamic-performance-improvement method for PWM DC-DC converters is mainly based on indirect dynamic performance indices, such as the gain margin and phase margin. However, both settling time and overshoot in the time domain are important in practical engineering. This makes it difficult for designers to obtain a clear understanding of the time-domain dynamic performance that can be achieved with improved control. In this study, a direct analysis of the time-domain dynamic characteristic of PWM DC-DC converters is performed. A dynamic-performance-improvement method based on eigenvalues and eigenvector sensitivity (E 2 S-based DPIM) is proposed to directly improve the time-domain dynamic performance index of PWM DC-DC converters. By considering a boost converter with proportional-integral control as an example, an additional virtual inductor current feedback control was designed using the proposed dynamic-performance-improvement method. Simulation and experimental results verify the validity and accuracy of the proposed dynamic-performance-improvement method.

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“…The analytical equations extracted by state-plane analysis can be used directly in the optimization process to increase accuracy. State-plane analysis has been applied to the converters with two or three resonant elements [19,[21][22][23], but the CLLC resonant converter has five resonance elements (two series capacitor-inductor and one transformer) and state-plane analysis is hard to accomplish. Therefore, most of the researches have been focused on FHA and TDA methods [8,[10][11][12][24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Generalized State-Plane Analysis of Bidirectional CLLC Resonant Converter

Rezayati

Tahami

Schanen

et al. 2022

IEEE Trans. Power Electron.

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The CLLC resonant converter is a promising candidate for high efficient, bidirectional power transfer applications such as vehicle-to-grid (V2G) on-board charger and hybrid vehicle DC-DC converter. Nevertheless, the analysis of CLLC still remains challenging because of its complex multiresonant nature and several storage elements. In this paper, a circuit analysis method based on change of variables is presented that maps the state space equations into two decoupled sets of equations. The analyses are carried out in two state-plane coordinate systems, then the results are mapped onto the original region. The proposed method is then used to thoroughly analyze the CLLC resonant converter operating in the continuous conduction mode (CCM). The voltage and current stresses of components, zero voltage switching condition, output voltage gain, output characteristic diagram, and mode boundary of CCM/DCM are then obtained. The accuracy of the proposed approach is verified by the experiments on a 3 kW bidirectional CLLC resonant converter with GaN transistors as the primary and secondary side switches. The results confirm the accuracy of the proposed state-plane analysis of the CLLC resonant converter operating in either direction of power transferring. 1

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Near-Time-Optimal Dynamics in PWM DC–DC Converters: Dual-Loop Geometric Control

Cited by 8 publications

References 34 publications

A Tutorial and Review Discussion of Modulation, Control and Tuning of High-Performance DC-DC Converters Based on Small-Signal and Large-Signal Approaches

A Tutorial and Review Discussion of Modulation, Control and Tuning of High-Performance DC-DC Converters Based on Small-Signal and Large-Signal Approaches

Time-domain Dynamic-performance-improvement Method for Pulse-width-modulated DC-DC Converters Based on Eigenvalue and Eigenvector Sensitivity

Generalized State-Plane Analysis of Bidirectional CLLC Resonant Converter

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