Robust Digital Control for an LLC Current-Resonant DC-DC Converter

Nishimura, Tomoya; Adachi, Yuka; Ohta, Yoshihiro; Higuchi, Kohji; Takegami, Eiji; Tomioka, Satoshi; Jirasereeamornkul, Kamon; Chamnongthai, Kosin

doi:10.37936/ecti-cit.201371.54355

Cited by 4 publications

(5 citation statements)

References 2 publications

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“…Inspecting (22), it is noticed that e 1 depends of θ θ θ and θ θ θ * . Where θ θ θ origin is in the APDR control action, andθ θ θ * is related to the periodic disturbance d. From the APDR subsystem point of view, it is assumed that there is a correct solution called θ θ θ * for the adapted θ θ θ that reject the disturbance d and brings e 1 to zero.…”

Section: Tracking Error Definitionmentioning

confidence: 99%

“…To overcame small-signal model limitations, nonlinear controllers have been proposed in the literature presenting strong robustness against disturbances, parameters uncertainties, parametric variation, unmodelled dynamics, and load variations. Specifically, to control the DC/DC LLC converter, sliding-mode control is proposed in [20], bang-bang control in [21], robust control in [22], model reference adaptive control (MRAC) in [23], and optimal trajectory control in [24].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Hybrid Dual-Loop Control for Current Regulation and Low-Frequency Ripple Rejection in Led Drivers

Menke¹,

Álvarez²,

Tambara³

et al. 2021

Eletrônica de Potência

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This paper presents a new hybrid dualloop control system for the DC/DC LLC resonant converter, operating as a downstream DC/DC converter in a two independent stage offline LED driver. The outer loop employs a PI controller to maintain the average LED current regulated at the reference value and reject parametric variation.The inner loop implements an adaptive periodic disturbance rejection (APDR) subsystem, thus conceiving the hybrid PI&APDR controller. The APDR subsystem is designed to strictly reject the bus voltage ripple and limit its transmission to the LED current. Experimental results show the proposed controller feasibility in achieving good tracking behavior, reduced output current ripple under different bus voltage ripple amplitude and frequency, robustness against parametric variations, and simple implementation and design. For the sake of completeness, the proposed PI&APDR is compared with the conventional proportional resonant controller employing experimental results and extra analysis based on simulations.

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Section: Tracking Error Definitionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hybrid Dual-Loop Control for Current Regulation and Low-Frequency Ripple Rejection in Led Drivers

Menke¹,

Álvarez²,

Tambara³

et al. 2021

Eletrônica de Potência

View full text Add to dashboard Cite

show abstract

“…In [22] classic PI controller has been implemented digitally for UPS charger based on placing the controller zero near the dominant pole of converter transfer function. Also in some other literature, nonlinear control methods have been proposed, such as predictive control [23], sliding-mode control [24][25][26], bang-bang control [27,28], robust control [29][30][31], and different digital controller [32][33][34][35], all are not applicable to low cost SMPS products because of their more implementation costs and complexity. Therefore in the industrial view, they are not a good candidate.…”

Section: Introductionmentioning

confidence: 99%

A novel analog controller design scheme for LLC resonant converter used in battery charging application

Saadati

Ghayebloo

Taheri

2022

IET Power Electronics

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A new generation of batteries must be charged according to the charging curves recommended by battery manufacturers. For high reliability, low cost, high speed, and pulse by pulse protection ability, the controller of these chargers are commonly designed by analog circuits. Analog controllers can be implemented by internal circuits of analog controller ICs with additional passive elements. This paper proposes a controller design approach for battery charger applications with an LLC converter. The proposed approach stands on a novel method for applying the well-known least-squares (LS) identification method for designing the classic controller with changing the identification problem to the design problem. Compared with other methods, the proposed approach benefits from design a controller with desired structure and desired performance, simultaneously. Here, modelling of LLC converter has been carried out by the first harmonic approximation (FHA) method. For controller design, the linear model has been extracted by linearizing the non-linear FHA model. In addition, for providing the reduced switching losses and increased efficiency, the passive elements of the resonance tank and isolation transformer ratio have been designed to operate the converter in the zero-voltage switching (ZVS) region. To verify the controller and designed converter, some simulation and experimental results are provided.

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“…However, it is still difficult to achieve perfect control performance against a wide-range variation of load conditions by using these linear control methods. Although some non-linear control methods are proposed to improve the control performance, such as sliding-mode control [29], bang-bang control [30], robust control [31], self-adaptive fuzzy control [32] etc., implementations are difficult due to their complexity. The authors of [33][34][35] proposed optimal trajectory control methods through combining a proportional-integral (PI) controller with an optimal trajectory controller to achieve good steady and dynamic performance.…”

Section: Introductionmentioning

confidence: 99%

Hybrid mode‐hopping modulation for LLC resonant converter achieving high efficiency and linear behaviour

Fang

Huang

Jing

et al. 2020

IET Power Electronics

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Frequency modulation (FM) has been widely used in the inductor-inductor-capacitor (LLC) resonant converter due to excellent soft switching features. However, low power efficiency in light load conditions and complex control due to the nonlinear converter behaviour are common concerns for the FM method. In this study, a hybrid mode-hopping modulation method is proposed for the LLC resonant converter to address these challenges. The LLC resonant converter operates at any two of three power-efficient operating modes for a different amount of time within a single modulation period. By determining the mode hopping time and combining different mode-hopping modulations, the LLC resonant converter can achieve a wide range of output power and maintain high efficiency at the same time. Besides, since the switching frequencies are fixed, the relationships between the duty cycle and the output power are linear, which can significantly simplify the control design. Compared with the existing modulation methods, the proposed hybrid mode-hopping modulation makes the LLC resonant converter behaves linear, simplifies the control design, achieves wide operation range and ensures high efficiency even in light load condition.

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Robust Digital Control for an LLC Current-Resonant DC-DC Converter

Cited by 4 publications

References 2 publications

Hybrid Dual-Loop Control for Current Regulation and Low-Frequency Ripple Rejection in Led Drivers

Hybrid Dual-Loop Control for Current Regulation and Low-Frequency Ripple Rejection in Led Drivers

A novel analog controller design scheme for LLC resonant converter used in battery charging application

Hybrid mode‐hopping modulation for LLC resonant converter achieving high efficiency and linear behaviour

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