Sensorless Ripple Current Mode Control to Achieve Inductor-Deviation-Tolerant BCM Operation for Boost Converter

For switched mode power converters, boundary conduction mode (BCM) operation is an attractive alternative to improve the bandwidth, overall size, and efficiency. In this article, a sensorless ripple current mode (SRCM) controller is proposed to achieve inductor-deviation-tolerant BCM operation for b...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2020-11, Vol.35 (11), p.12359-12369
Main Authors: Lyu, Dian, Li, Linkai, Li, Songke, Min, Run, Wang, Yinyu, Zhang, Desheng, Tong, Qiaoling
Format: Article
Language:English
Subjects:
Algorithms
Boundary conduction mode (BCM)
Computer simulation
Control stability
Controllers
Convergence
current mode control
Deviation
Efficiency
Energy conversion efficiency
Inductance
Inductors
Modulation
Phase change materials
power converter
Power converters
Power efficiency
Ripples
sensorless
Switches
Tuning
Valleys
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Summary:For switched mode power converters, boundary conduction mode (BCM) operation is an attractive alternative to improve the bandwidth, overall size, and efficiency. In this article, a sensorless ripple current mode (SRCM) controller is proposed to achieve inductor-deviation-tolerant BCM operation for boost converter. Compared to conventional approaches with current sensing or ZCD, the proposed controller relies on a digital algorithm to ensure consistent BCM operation. The algorithm calculates on / off durations of the main switch so that the inductor current valley value converges to zero. The convergence process is proved by a damped current model with considerations of parasitics and output voltage ripple. Since the convergence is not related to the inductor value, the SRCM controller achieves inductor-deviation-tolerant BCM operation. Furthermore, to improve the power efficiency, an optimal transition condition and a compensation time are adopted to achieve valley switching (VS). Finally, both consistent BCM operation and VS are achieved by the proposed control strategy. Simulations and experimental results prove that the controller effectively improves the closed-loop stability, the robustness to inductor deviation, and the power efficiency.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2020.2984639