Efficiency optimization of variable‑frequency controlled power factor correction converters

More attention is being paid to energy effi ciency and harmonic reduction. Thus, power factor correction (PFC) is widely used in power supplies. However, under the condition of light load, the single-stage LLC PFC converter has the problems of low effi ciency and output voltage misaligned, such as other PFC topologies. Aiming at the problems that occur under light load conditions, this paper proposes a least-pulse delta (Δ)–sigma (Σ) modulation (LPΔ–Σ modulation). Under diff erent loads, the system can automatically select the appropriate pulse density and reduce the energy transfer to the secondary side by uniformly turning off the driving signals, which stabilizes the output voltage and improves the system effi ciency. Meanwhile, LPΔ–Σ modulation is more benefi cial for improving the PF value when compared with the burst mode under light load conditions. Experimental results show that LPΔ–Σ modulation based on the traditional dual-loop control can eff ectively stabilize the output voltage and improve effi ciency. When compared with the existing burst control scheme, it reduces the output voltage ripple and eff ectively improves the PF.

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Cite this article

[IEEE Style]

Y. Zhou, X. He, S. Liu, F. Hong, J. Ren, D. Li, "Efficiency optimization of variable‑frequency controlled power factor correction converters," Journal of Power Electronics, vol. 22, no. 6, pp. 970-980, 2022. DOI: 10.1007/s43236-022-00407-z.

[ACM Style]

Yufei Zhou, Xueru He, Shuai Liu, Feng Hong, Jiaqi Ren, and Dongdong Li. 2022. Efficiency optimization of variable‑frequency controlled power factor correction converters. Journal of Power Electronics, 22, 6, (2022), 970-980. DOI: 10.1007/s43236-022-00407-z.