Fixed-Frequency Boundary Control of Buck Converter With Second-Order Switching Surface

Yan, W.T.; Au, K.T.K.; Ho, Carl Ngai Man; Chung, Henry Shu-Hung

doi:10.1109/tpel.2009.2022165

Cited by 79 publications

(17 citation statements)

References 24 publications

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“…Linear switching boundaries are rarely the best choice to produce fast large-signal transient response and acceptable small-signal performance. Higher-order switching boundaries [155], [156], [157] can be set up to support better tradeoffs. A second-order surface takes the form [155]…”

Section: A Geometric Control Methods 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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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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Section: A Geometric Control Methods 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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“…The schemes in [26][27][28][29] use an additional PI control loop that adjusts the width of the hysteresis band in order to achieve fixed switching frequency. This design requires the dynamics of the Frequency Control Loop (FCL) to be much slower as compared to the dynamics of the voltage and current control loops, as the faster dynamics may cause interaction with the outer control loops [26,27], hence the stability of the linearized system may not be ensured in this scenario [28,29]. In [30], the authors have proposed an FCL that monitors the time period of each switching cycle and compares it with a reference switching period.…”

Section: Introductionmentioning

confidence: 99%

A Novel Filter Extracted Equivalent Control Based Fixed Frequency Sliding Mode Approach for Power Electronic Converters

2019

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The key issue in the implementation of the Sliding Mode Control (SMC) in analogue circuits and power electronic converters is its variable switching frequency. The drifting frequency causes electromagnetic compatibility issues and also adversely affect the efficiency of the converter, because the proper size of the inductor and the capacitor depends upon the switching frequency. Pulse Width Modulation based SMC (PWM-SMC) offers the solution, however, it uses either boundary layer approach or employs pulse width modulation of the ideal equivalent control signal. The first technique compromises the performance within the boundary layer, while the latter may not possess properties like robustness and order reduction due to the absence of the discontinuous function. In this research, a novel approach to fix the switching frequency in SMC is proposed, that employs a low pass filter to extract the equivalent control from the discontinuous function, such that the performance and robustness remains intact. To benchmark the experimental observations, a comparison with existing double integral type PWM-SMC is also presented. The results confirm that an improvement of 20% in the rise time and 25.3% in the settling time is obtained. The voltage sag during step change in load is reduced to 42.86%, indicating the increase in the robustness. The experiments prove the hypothesis that a discontinuous function based fixed frequency SMC performs better in terms of disturbances rejection as compared to its counterpart based solely on ideal equivalent control.

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“…Constant or limited switching frequency solutions, like those proposed in [5]- [7] or [14]- [22], are often sensitive to variations of system parameters (e.g., DC-link voltage, inductance value), to dead-times, and sampling delays. These factors, altogether, limit the practical effectiveness of the frequency regulation.…”

Section: Introductionmentioning

confidence: 99%

“…Besides, these solutions employ additional analog hardware, which makes them relatively complex and sensitive to offsets, drifts, tolerances, and aging effects. For instance, operational amplifiers are needed in [4], whereas low latency comparators and/or digital to analog converters (DACs) are used in [5]- [6] and [15]- [22]. Likewise, frequency-to-voltage converters are adopted in [23]- [24].…”

Section: Introductionmentioning

confidence: 99%

A Nonlinear Wide-Bandwidth Digital Current Controller for DC–DC and DC–AC Converters

Buso

Caldognetto

2015

IEEE Trans. Ind. Electron.

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A fully digital, non-linear, wide bandwidth, current controller for DC-AC and DC-DC voltage source converters is presented in this paper. Exploiting oversampling, the controller mimics an analog hysteresis current controller, but does not employ analog comparators, digital to analog converters or any other analog signal pre-or post-processing circuitry. Indeed, it fully virtualizes the hysteresis controller's operation and, based only on a non-linear, efficient, current error processing algorithm, drives the power converter at almost constant switching frequency. Overall, it offers the same excellent dynamic performance of the analog hysteresis controller and, at the same time, solves most of the related problems. Because the current error sample processing algorithm is inherently parallel in structure, the controller is suited for VHDL synthesis and FPGA implementation, which guarantees flexibility and low cost, together with minimum computation and signal conversion delays. Its intended application areas include active filters, uninterruptible power supplies, micro-grid distributed energy resource (DER) controllers, laboratory battery testers, welding machines.

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Fixed-Frequency Boundary Control of Buck Converter With Second-Order Switching Surface

Cited by 79 publications

References 24 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

A Novel Filter Extracted Equivalent Control Based Fixed Frequency Sliding Mode Approach for Power Electronic Converters

A Nonlinear Wide-Bandwidth Digital Current Controller for DC–DC and DC–AC Converters

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