Peak offsetting based CPM controller for multi-level flying capacitor converters

Lu, Liangji; Ahsanuzzaman, S. M.; Prodić, Aleksandar; Calabrese, Giacomo; Frattini, Giovanni; Granato, Maurizio

doi:10.1109/apec.2018.8341543

Cited by 23 publications

(7 citation statements)

References 10 publications

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“…The inductor current has unsymmetrical waveform. Different charging and discharging slopes on flying capacitor further deviate the flying capacitor voltage value from the desired reference value [33]. In the case shown here, the input flying capacitor needs to be charged and output flying capacitor needs to be discharged.…”

Section: Flying Capacitor Controlmentioning

confidence: 99%

“…On top of that, intrinsic flying capacitor stabilization could be potentially obtained in the ML-RS mode. According to the work presented [33], valley current mode control/peak current mode control provide intrinsic flying capacitor stabilization when duty ratio is larger/smaller than 0.5. And in the ML RS mode, the duty ratio of 3-level buck side is greater 0.5 and duty ratio of 3-level boost side is smaller than 0.5.…”

Section: Future Workmentioning

confidence: 99%

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Low-frequency ripple-shaping controller for operation of non-inverting buck-boost converters near step-up step-down boundary

Zhang

Radovic

Ahsanuzzaman

et al. 2018

2018 IEEE Applied Power Electronics Conference and Exposition (APEC)

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The work presented in this thesis focuses on the elimination of step-up step-down mode transition problems that occur in low power dc-dc noninverting buck-boost (NIBB) converters, while also significantly improving power processing efficiency compared to existing state-of-the-art solutions. Near the step-down step-up boundary, the introduced controller enters a low-frequency ripple shaping mode of operation that allows lower switching frequency than in conventional buck or boost modes without paying a penalty of increased inductor current ripple, i.e. higher RMS current. As a result, both switching, and conduction losses are reduced. In addition, multi-level non-inverting buck-boost (ML-NIBB) is presented as a potential alternative to the conventional NIBB. Compared to the conventional architecture, the ML-NIBB converter has the potential to reduce the total volume and increase power processing efficiency. An extended version of the ripple-shaping controller is presented and used to preserve the smooth transition between step-down and step-up mode. The effectiveness of the presented ripple-shaping controllers is demonstrated with two 1.8 V to 5 V input, 3.3 V/10 W experimental prototypes, for both NIBB and ML-NIBB topologies.ii

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Section: Flying Capacitor Controlmentioning

confidence: 99%

Section: Future Workmentioning

confidence: 99%

Low-frequency ripple-shaping controller for operation of non-inverting buck-boost converters near step-up step-down boundary

Zhang

Radovic

Ahsanuzzaman

et al. 2018

2018 IEEE Applied Power Electronics Conference and Exposition (APEC)

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“…A representação do trem de pulsos de (10) pode ser levada ao domínio da frequência discreto, no qual aplica-se a transformada Z (onde Z = e sT s ), e que resulta na equação (13).ĩ…”

Section: A Estratégia De Controle Cpm Para O Conversor Buckunclassified

“…Dentre as estratégias mencionadas, um método amplamente implementado pela indústriaé o controle por corrente programada (Current Programmed Mode Control -CPM) ou também conhecido por controle por corrente de pico. Essa estratégiaé utilizada tanto para implementação em circuitos integrados [7], [9], [12], até conversores multi-níveis [8], [13], possuindo uma grande versatilidade em termos de níveis de potência e tensão do sistema.…”

Section: Introductionunclassified

Contribuições ao Controle Current Programmed Mode (CPM) Aplicado a Conversores CC-CC

Júnior¹,

Vecchia²,

Kirsten³

et al. 2021

Eletrônica de Potência

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Resumo -Apesar de muito difundido na indústria, a estratégia de controle CPM aplicada a conversores CC-CC carece de discussões científicas e uma completa metodologia de projeto para sua correta implementação. Neste contexto, este artigo contribui com uma metodologia para a modelagem e o projeto do controle CPM para os conversores CC-CC Buck e Forward, destacando os desafios existentes em cada um deles. O modelo dos conversores considerando frequências subharmônicaś e apresentado, além da consideração da corrente de magnetização como uma rampa externa de compensação no sistema de controle. A modelagem final do conversor Forward foi validada via simulação no circuito comutado e no espectro da frequência. Resultados de simulação e experimentais para validação da estratégia de controle discutida são apresentados para os seguintes parâmetros de projeto: 400V-24V de tensão de entrada e saída, 100 kHz de frequência de comutação e 200 W de potência.

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“…The main challenge for 3LFC converter control is the maintenance of flying capacitor voltage balance, which is required to obtain a symmetric inductor current waveform in each half of a switching period and to preserve the voltage levels equal on the switching devices. For this purpose, various control methods are proposed for voltage regulated 3LFC converters [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] in the literature. The traditional control methods for DC-DC converters such as current mode and voltage mode control are advantageous for 3LFC buck converters due to their technical maturity.…”

Section: Introductionmentioning

confidence: 99%

Asymmetric slope compensation for digital hybrid current mode control of a three-level flying capacitor buck converter

Ugur¹,

Yılmaz²

2020

Turk J Elec Eng & Comp Sci

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The three-level flying capacitor (3LFC) buck converter has the potential to provide better efficiency and higher power density as compared to the traditional buck converter. However, due to the flying capacitor's instability issues, control is challenging. In this paper, the digital hybrid current mode (DHCM) control method, which combines the average and peak current mode control techniques, is modified and implemented to a 3LFC buck converter. For flying capacitor (FC) voltage balancing, a novel asymmetric slope compensation (ASC) technique is presented. The proposed ASC technique achieves FC voltage balancing by adjusting the slope compensation of the two switching pairs asymmetrically, and therefore is applicable to any type of digital peak current mode control (PCM) method. The ASC technique for DHCM control of the 3LFC buck converter is verified in simulations and experimentally with an ARMbased mixed-signal microcontroller on a 250-kHz, 24-V input, and 35-W/4-A output prototype. The overall control method enables the implementation of the 3LFC buck converter for accurate and fast current regulation, and therefore is especially advantageous for LED and laser diode driver applications.

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Peak offsetting based CPM controller for multi-level flying capacitor converters

Cited by 23 publications

References 10 publications

Low-frequency ripple-shaping controller for operation of non-inverting buck-boost converters near step-up step-down boundary

Low-frequency ripple-shaping controller for operation of non-inverting buck-boost converters near step-up step-down boundary

Contribuições ao Controle Current Programmed Mode (CPM) Aplicado a Conversores CC-CC

Asymmetric slope compensation for digital hybrid current mode control of a three-level flying capacitor buck converter

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