Constant on‑time variable frequency control for critical conduction mode GaN‑based totem‑pole PFC converters

Shuang Zhang; Yu Fang; Kaixin Shu; Qiuyang Gu; Xuehua Wang

Constant on‑time variable frequency control for critical conduction mode GaN‑based totem‑pole PFC converters

Vol. 23, No. 12, pp. 1856-1866, Dec. 2023

10.1007/s43236-023-00684-2

Constant on-time

Feed-forward

Critical conduction mode

Voltage-second principle

Abstract

A constant on-time variable frequency control (COTVFC) with feed-forward for a critical conduction mode (CRM) totempole power factor correction (PFC) converter is proposed in this paper. This control method only requires a single voltage loop, where the output is taken as the on-time of the main switches of the converter. The off-time of the main switches in different switching cycles is calculated by the voltage-second balance principle, which ensures that the converter always operates in the CRM. Feed-forward is introduced to improve the dynamic response of the converter. The control model is established and the transfer function from the on-time to the output is derived. On this basis, the control parameters of the voltage loop are designed. Then a simulation model is built in PSIM for simulation verification. Finally, a two-phase interleaved parallel GaN-based totem-pole PFC converter prototype is made for experimental verification. Simulation and experimental results verify the feasibility and effectiveness of the control method proposed in this paper.

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Cite this article

[IEEE Style]

S. Zhang, Y. Fang, K. Shu, Q. Gu, X. Wang, "Constant on‑time variable frequency control for critical conduction mode GaN‑based totem‑pole PFC converters," Journal of Power Electronics, vol. 23, no. 12, pp. 1856-1866, 2023. DOI: 10.1007/s43236-023-00684-2.

[ACM Style]

Shuang Zhang, Yu Fang, Kaixin Shu, Qiuyang Gu, and Xuehua Wang. 2023. Constant on‑time variable frequency control for critical conduction mode GaN‑based totem‑pole PFC converters. Journal of Power Electronics, 23, 12, (2023), 1856-1866. DOI: 10.1007/s43236-023-00684-2.