A DSP based digital control strategy for ZVS bidirectional Buck+Boost converter

Dung, Nguyen Anh; Hieu, Pham Phu; Chiu, Huang‐Jen; Hsieh, Yao‐Ching; Lin, Jing‐Yuan

doi:10.1109/igbsg.2018.8393570

Cited by 11 publications

(2 citation statements)

References 6 publications

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“…The selection of phase shift directly affects the soft-switching and closed-loop control, and it is hard to decide the proper phase shift. And a digital control strategy with the same soft-switching strategy for CBBC is presented in [35]. Literature [36] proposed a constant frequency softswitching control with minimum root mean square value of inductor current.…”

Section: Introductionmentioning

confidence: 99%

“…In DCM, when the inductor current drops to zero, the inductor current flows backwards, which results in the current intrusion and a great fluctuation of the output voltage [38], [39]. To prevent the current intrusion phenomenon, the zero-crossing detection circuit is usually used in [32], [34], and [35], but it increases the system cost and its accuracy influences the control performance. In the proposed control, the zero-crossing detection circuit is avoided by introducing a current measurement at a specific point and the online calculation of the zero-crossing point of inductor current.…”

Section: Introductionmentioning

confidence: 99%

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A Soft-Switching Control for Cascaded Buck-Boost Converters Without Zero-Crossing Detection

Liu

Song

et al. 2019

IEEE Access

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This paper proposes a novel soft-switching control without zero-crossing detection for the cascaded buck-boost converters (CBBCs). The proposed soft-switching control consists of two parts: soft-switching modulation and closed-loop control. In the modulation, the employed PWM approach is constructed by introducing a small negative current into the conventional PWM, and the soft-switching modulation based on the negative-current-based PWM is presented by adding a new switching process controlled by a modulation variable in the CBBC. In the closed-loop control, the relationship between the models of the negative-current-based PWM and the soft-switching modulation is deduced, and by utilizing the deduced relationship, the closed-loop control is designed while the PWM is modified to achieve the softswitching. Meanwhile, to further reduce the ripple current and device losses, the parameter of the proposed control is optimized by refining the restrictive conditions. While the zero-crossing point of the inductor current is calculated with a given algorithm based on a current measurement, the circuit of zero-crossing detection is avoided. The validity and feasibility of the proposed soft-switching control approach are confirmed by the simulations and experiments on a 200-W prototype. INDEX TERMS Soft-switching control, negative-current-based PWM, zero-crossing detection, optimal design, CBBC.

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Section: Introductionmentioning

confidence: 99%