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Title: A simple digital DCM control scheme for boost PFC operating in both CCM and DCM
Authors: Lim, S.F.
Khambadkone, A.M. 
Keywords: Boost power factor corrector (PFC)
digital discontinuous conduction mode (DCM) current control
input current distortion
Issue Date: Jul-2011
Citation: Lim, S.F., Khambadkone, A.M. (2011-07). A simple digital DCM control scheme for boost PFC operating in both CCM and DCM. IEEE Transactions on Industry Applications 47 (4) : 1802-1812. ScholarBank@NUS Repository.
Abstract: Digital average current controllers for boost power factor correctors (PFCs) are usually designed for continuous conduction mode (CCM). However, discontinuous conduction mode (DCM) appears in the inductor current near the zero crossings of the input current at light loads, resulting in input current distortion. It is caused by inaccurate average current values obtained in DCM and by the linear CCM PFC controller that is unable to ensure input current shaping in DCM whereby the converter exhibits nonlinear characteristic. This paper proposes a simple digital DCM control scheme that is achieved with minimal changes to the CCM average current control structure. It is mathematically and computationally simple. The result of all arithmetic operations in the proposed current control loop to obtain the desired control output can be achieved in a single clock cycle, whereas other DCM control schemes require multiple clock cycles. Good input current shaping is achieved in both CCM and DCM with the proposed CCM-DCM digital controller. © 2011 IEEE.
Source Title: IEEE Transactions on Industry Applications
ISSN: 00939994
DOI: 10.1109/TIA.2011.2153815
Appears in Collections:Staff Publications

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