A novel parameter-independent digital optimal control algorithm for DC-DC Buck converters based on parabolic curve fitting

Jia, Liang; Wang, Dong; Fu, Jizhen; Liu, Yanfei; Sen, P.C.

doi:10.1109/ecce.2010.5617982

Cited by 8 publications

(8 citation statements)

References 15 publications

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“…The algorithm discussed in [3] focuses on solving very significant ESR impact and improving accuracy of previous methods, in which ESR is negligible in the applications such as in [4], [8]- [11], and [19]. So in order to detect t 1 when the inductor current equals load current, a curve-fitting method is utilized to build an ideal capacitor voltage curve using three output voltage samples.…”

Section: Basis Of the Cbc Conceptmentioning

confidence: 99%

“…And for t 2 detection, time control is preferred for design simplicity. Moreover, the proposed method in [3] is more suitable for digital implementation.…”

Section: Basis Of the Cbc Conceptmentioning

confidence: 99%

“…The algorithm is derived based on output voltage curve analysis instead of balancing the geometric area of capacitor charge. Also an extension can be made for AVP application and input voltage step transient based on this SPV information [3].…”

Section: Basis Of the Cbc Conceptmentioning

confidence: 99%

“…This derivation provides a unique feature for optimizing both load and input voltage transients [3]. To optimize the input voltage transient, the two-switching-cycle compensation algorithm proposed in [17] has several limitations, such as, losing its applicability for the ultrafast/large input voltage change scenarios (≥2.5 V) and requiring accurate output filter component value (L o and C o ) and current sensing information to calculate the formulas and control the converter.…”

Section: B V-cbc Equation For a Buck Converter Undergoing A Loading mentioning

confidence: 99%

“…Although in the deviation, the ESR is ignored for simplification, previous research has been conducted to verify that the main effect of ESR will be estimation error of V sw (<5%) and slightly longer recovery time [3]. Therefore, even with significant ESR, the proposed V-CBC algorithm still maintains very good accuracy [3].…”

Section: B V-cbc Equation For a Buck Converter Undergoing A Loading mentioning

confidence: 99%

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Voltage-Based Charge Balance Controller Suitable for Both Digital and Analog Implementations

Jia

Liu

2013

IEEE Trans. Power Electron.

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In this paper, a novel voltage-based charge balance control algorithm is presented, which is suitable for both digital and analog implementations for buck converter to achieve nearoptimal dynamic performance. First, this paper presents a new derivation of practical charge balance equations based on simplified differential equations. This deviation is applicable to both fast input voltage and load step transients. The final algorithm does not require complex calculations and accurate knowledge of the output filter LC parameter. Second, the proposed voltage-based charge balance controller does not require accurate current sensor or fast analog-to-digital converter. Instead, to detect the critical time instant when the inductor current equals the new load current, a practical extreme voltage detector is introduced to capture the output voltage peak/valley information. Third, this algorithm is simple to be implemented by either low-cost digital signal processing devices (such as microcontroller unit) or analog circuits. Both digital and analog experimental prototypes are built to verify the feasibility and advantages of the new method.Index Terms-Adaptive voltage positioning (AVP), capacitor charge balance controller, dc-dc buck converters, digital control, extreme voltage detector, fast transient performance, optimal control.

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Section: Basis Of the Cbc Conceptmentioning

confidence: 99%

“…And for t 2 detection, time control is preferred for design simplicity. Moreover, the proposed method in [3] is more suitable for digital implementation.…”

Section: Basis Of the Cbc Conceptmentioning

confidence: 99%

Section: Basis Of the Cbc Conceptmentioning

confidence: 99%

Section: B V-cbc Equation For a Buck Converter Undergoing A Loading mentioning

confidence: 99%

Section: B V-cbc Equation For a Buck Converter Undergoing A Loading mentioning

confidence: 99%

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