Digital Hybrid Current Mode Control with Asymmetric Slope Compensation for Three-Level Flying Capacitor Buck Converter

Ugur, Abdulkerim; Yılmaz, Murat

doi:10.1109/acemp-optim44294.2019.9007190

Cited by 3 publications

(1 citation statement)

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“…Due to the PCM-like inner control loop, a FC balancing mechanism is essential in the DHCM control. The present study not only verifies the DHCM control for the 3LFC buck converter, but also provides a novel control mechanism for FC balancing of the 3LFC buck converter with PCM-based control methods, which is named as asymmetric slope compensation (ASC) [20],. A feed forward loop exists in the proposed ASC control technique, in which the difference between the half of the input and the flying capacitor voltage is processed.…”

Section: Introductionsupporting

confidence: 58%

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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Section: Introductionsupporting

confidence: 58%