Title :
Small-signal modeling of DC converters with digital peak-current-mode control
Author :
Nien, Hung-Shou ; Chen, Dan ; Chang, Wei-Hsu
Author_Institution :
RichTek Technol. Corp., Hsinchu
Abstract :
In this paper, an S-domain small-signal model is proposed for a buck converter with digital peak-current-mode (DPCM) control. This model is easily understandable and practically useful for power electronic engineers familiar with DC/DC converters using traditional analog control. It can be used for designing the digital compensator and the prediction of control performance of DPCM converters. The problems with delay effect and the limit-cycle instability unique to digital control were addressed in the context of a DPCM converter. The model also allows one to predict the practical limit of a DPCM converter. A synchronous buck converter with digital peak-current-mode control using a field-programmable-gate-array (FPGA) has been built to verify the proposed model. The model can easily be extended to other digitally controlled power converter configurations.
Keywords :
DC-DC power convertors; electric current control; field programmable gate arrays; DC-DC converters; S-domain small-signal model; digital peak-current-mode control; field-programmable-gate-array; small-signal modeling; synchronous buck converter; Analog-digital conversion; Buck converters; DC-DC power converters; Digital control; Electronic mail; Feedback; Field programmable gate arrays; Power engineering and energy; Power system modeling; Voltage;
Conference_Titel :
Power Electronics Specialists Conference, 2008. PESC 2008. IEEE
Conference_Location :
Rhodes
Print_ISBN :
978-1-4244-1667-7
Electronic_ISBN :
0275-9306
DOI :
10.1109/PESC.2008.4592457