Enhanced Variable On-time Control of Critical Conduction Mode Boost Power Factor Correction Converters

Jung-Won Kim; Je-Hyun Yi; Bo-Hyung Cho

Enhanced Variable On-time Control of Critical Conduction Mode Boost Power Factor Correction Converters

Jung-Won Kim

Je-Hyun Yi

Bo-Hyung Cho

Vol. 14, No. 5, pp. 890-898, Sep. 2014

10.6113/JPE.2014.14.5.890

Critical conduction mode

Digital control

Power factor correction

Total harmonic distortion

Variable on-time control

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Abstract

Critical conduction mode boost power factor correction converters operating at the boundary of continuous conduction modeand discontinuous conduction mode have been widely used for power applications lower than 300W. This paper proposes anenhanced variable on-time control method for the critical conduction mode boost PFC converter to improve the total harmonicdistortion characteristic. The inductor current, which varies according to the input voltage, is analyzed in detail and the optimalon-time is obtained to minimize the total harmonic distortion with a digital controller using a TMS320F28335. The switchon-time varies according to the input voltage based on the computed optimal on-time. The performance of the proposed controlmethod is verified by a 100W PFC converter. It is shown that the optimized on-time reduces the total harmonic distortion about52% (from 10.48% to 5.5%) at 220V when compared to the variable on-time control method.

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Cite this article

[IEEE Style]

J. Kim, J. Yi, B. Cho, "Enhanced Variable On-time Control of Critical Conduction Mode Boost Power Factor Correction Converters," Journal of Power Electronics, vol. 14, no. 5, pp. 890-898, 2014. DOI: 10.6113/JPE.2014.14.5.890.

[ACM Style]

Jung-Won Kim, Je-Hyun Yi, and Bo-Hyung Cho. 2014. Enhanced Variable On-time Control of Critical Conduction Mode Boost Power Factor Correction Converters. Journal of Power Electronics, 14, 5, (2014), 890-898. DOI: 10.6113/JPE.2014.14.5.890.