Title :
High frequency modeling of peak current mode control of DC-DC converters
Author :
Karimi, Charif ; Godoy, Emmanuel ; Iftikhar, M.U. ; Lefranc, Pierre ; Sadarnac, Daniel
Author_Institution :
Dept. Energie, SUPELEC, Gif-sur-Yvette
Abstract :
The control of power converters can be difficult if high dynamic performance is required, especially against the variations in supply voltage and load. This difficulty can further increase in the presence of input filters, which are intentionally underdamped to decrease the converter losses. In such cases, the peak current mode control facilities the design of control law. The usual approach for the modeling of this type of control assumes constant current ripples in smoothing inductance. However, this assumption is somewhat restrictive and limits the validity of the model at high frequency. This paper presents a modeling approach which avoids this assumption, consequently leading to a better representation of the converter at high frequencies. In order to improve its performance with respect to load and line disturbances, this kind of control implicitly integrates a feedforward compensation. The application of the developed analysis is carried out on a buck converter; however, it is equally applicable to any other type of converter.
Keywords :
DC-DC power convertors; compensation; electric current control; feedforward; DC-DC converters; buck converter; constant current ripples; converter losses; feedforward compensation; high-frequency modeling; line disturbances; load disturbances; peak current mode control; power converter control; DC-DC power converters; Decision support systems; Frequency conversion;
Conference_Titel :
Power Engineering, Energy and Electrical Drives, 2009. POWERENG '09. International Conference on
Conference_Location :
Lisbon
Print_ISBN :
978-1-4244-4611-7
Electronic_ISBN :
978-1-4244-2291-3
DOI :
10.1109/POWERENG.2009.4915188