Single ADC Digital PFC Controller Using Precalculated Duty Cycles

Traditional digital power factor correction (PFC) uses three sensors to measure the input and output voltages and the input current. Each sensor, especially the input current one, increases the cost of the system and generates power losses in case of resistive sensors. This paper presents a controll...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2014-02, Vol.29 (2), p.996-1005
Main Authors: Sanchez, Alberto, de Castro, Angel, Lopez, Victor Manuel, Azcondo, Francisco J., Garrido, Javier
Format: Article
Language:English
Subjects:
Applied sciences
Bandwidth
Circuit properties
Comparators
Control systems
Controllers
Converters
Current measurement
Digital
Digital circuits
Digital control
Electric currents
Electric potential
Electric power
Electric, optical and optoelectronic circuits
Electrical engineering. Electrical power engineering
Electrical equipment
Electrical machines
Electronic circuits
Electronics
Exact sciences and technology
field-programmable gate arrays
Power electronics, power supplies
rectifiers
Regulation and control
Regulators
Ripples
Sensors
Signal convertors
switched mode power supplies
Switches
Synchronization
Voltage
Voltage control
Voltage measurement
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Summary:Traditional digital power factor correction (PFC) uses three sensors to measure the input and output voltages and the input current. Each sensor, especially the input current one, increases the cost of the system and generates power losses in case of resistive sensors. This paper presents a controller for boost PFC converters. It uses precalculated duty cycles generated offline, and applies them to the switch. In order to control the converter with nonnominal conditions, just one analog-to-digital converter (ADC) is used, which measures the output voltage. Measuring the average and the ripple of the output voltage with this ADC, the controller takes compensation action for changes in the input voltage but also in the load of the converter. The average value is used to control the input voltage changes, while the ripple value is used to control load changes. These two loops present low frequency bandwidth, so the ADC and the whole system can be low cost. Finally, a comparator is used to detect the zero-crossing of the input voltage, so the precalculated values are synchronized with the ac mains. In this way, the converter only uses one ADC and one comparator, both with low bandwidth. Results show that high power factor and normative compliance are reached, even under nonnominal conditions.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2013.2256931