DocumentCode :
108206
Title :
Universal Digital Controller for Boost CCM Power Factor Correction Stages Based on Current Rebuilding Concept
Author :
Lopez, V.M. ; Azcondo, Francisco J. ; de Castro, Angel ; Zane, Regan
Author_Institution :
Univ. de Cantabria, Santander, Spain
Volume :
29
Issue :
7
fYear :
2014
fDate :
Jul-14
Firstpage :
3818
Lastpage :
3829
Abstract :
Continuous conduction mode power factor correction (PFC) without input current measurement is a step forward with respect to previously proposed PFC digital controllers. Inductor volt-second (vsL) measurement in each switching period enables digital estimation of the input current; however, an accurate compensation of the small errors in the measured vsL is required for the estimation to match the actual current. Otherwise, they are accumulated every switching period over the half-line cycle, leading to an appreciable current distortion. A vsL estimation method is proposed, measuring the input (vg) and output voltage (vo). Discontinuous conduction mode (DCM) occurs near input line zero crossings and is detected by measuring the drain-to-source MOSFET voltage vds. Parasitic elements cause a small difference between the estimated voltage across the inductor based on input and output voltage measurements and the actual one, which must be taken into account to estimate the input current in the proposed sensorless PFC digital controller. This paper analyzes the current estimation error caused by errors in the ON-time estimation, voltage measurements, and the parasitic elements. A new digital feedback control with high resolution is also proposed. It cancels the difference between DCM operation time of the real input current, (TDCMg) and the estimated DCM time (TDCMreb). Therefore, the current estimation is calibrated using digital signals during operation in DCM. A fast feedforward coarse time error compensation is carried out with the measured delay of the drive signal, and a fine compensation is achieved with a feedback loop that matches the estimated and real DCM time. The digital controller can be used in universal applications due to the ability of the DCM time feedback loop to autotune based on the operation conditions (power level, input voltage, output v- ltage...), which improves the operation range in comparison with previous solutions. Experimental results are shown for a 1-kW boost PFC converter over a wide power and voltage range.
Keywords :
MOSFET; digital control; distortion; error compensation; feedforward; inductors; power factor correction; voltage measurement; DCM operation time; DCM time feedback loop; PFC digital controllers; VSL estimation method; boost CCM power factor correction stages; boost PFC converter; continuous conduction mode power factor correction; current distortion; current estimation error; current rebuilding concept; digital estimation; digital signals; discontinuous conduction mode; drain-to-source MOSFET voltage; fast feedforward coarse time error compensation; feedback loop; half-line cycle; inductor volt-second measurement; input voltage measurements; on-time estimation; output voltage measurements; parasitic elements; power 1 kW; sensorless PFC digital controller; universal digital controller; Current measurement; Estimation error; Power factor correction; Switches; Voltage control; Voltage measurement; Boost converter; continuous conduction mode; digital control; digital error compensation; power factor correction; sensorless controller;
fLanguage :
English
Journal_Title :
Power Electronics, IEEE Transactions on
Publisher :
ieee
ISSN :
0885-8993
Type :
jour
DOI :
10.1109/TPEL.2013.2280077
Filename :
6588592
Link To Document :
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