Dead-zone digital controllers for improved dynamic response of low harmonic rectifiers

This paper introduces a simple digital control method that enables fast regulation of the output voltage in low harmonic rectifiers with power factor correction (PFC). The method is based on the use of an insensitive region, i.e., "dead-zone," in analog-to-digital conversion, for eliminati...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2006-01, Vol.21 (1), p.173-181
Main Authors: Prodic, A., Maksimovic, D., Erickson, R.W.
Format: Article
Language:English
Subjects:
Analog-digital conversion
Analog-to-digital conversion
Applied sciences
Capacitors
Controllers
Digital
Digital control
Digital electronics
Diodes
Electric potential
Electrical engineering. Electrical power engineering
Electronics
Exact sciences and technology
Feedback control systems
Feedback loop
Harmonics
Low voltage
low-bandwidth voltage-loop controllers
Power electronics, power supplies
Power factor correction
power factor correction (PFC)
Power system harmonics
Rectifiers
Ripples
Switching frequency
Voltage
Voltage control
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Summary:This paper introduces a simple digital control method that enables fast regulation of the output voltage in low harmonic rectifiers with power factor correction (PFC). The method is based on the use of an insensitive region, i.e., "dead-zone," in analog-to-digital conversion, for elimination of the output capacitor voltage ripple in the feedback loop. The dead-zone can either be fixed and larger than the maximum ripple magnitude, or it can be dynamically adjusted in accordance with the output load. Simple implementations of these two dead-zone controllers are shown on an experimental completely digitally controlled 250-W boost PFC operating at 200-kHz switching frequency. The experimental results show that this control method results in low current harmonics and improved load transient responses, which are significantly faster than in low-harmonic rectifiers with conventional low-bandwidth voltage-loop controllers.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2005.861157