Title :
Improvement of one-comparator counter-based PFM control for DC-DC converter
Author :
Hwu, K.I. ; Yau, Y.T.
Author_Institution :
Dept. of Electr. Eng., Nat. Taipei Univ. of Technol., Taipei, Taiwan
Abstract :
In this paper, counter-based pulse-width-modulated (PFM) control according to the output voltage ripple using a one-comparator scheme without any analogue-to-digital converter (ADC) used is presented herein, which is realized based on the field programmable gate arrays (FPGA) and applied to DC-DC converters. However, too small or distorted output ripple limits its performance. Consequently, a positive-sloped ramp wave injection method is used to overcome this problem and enhance its application capability significantly. In the paper, the details of this positive-sloped ramp wave injection method are illustrated. And, some experimental results are provided to verify the effectiveness of the proposed control strategy.
Keywords :
DC-DC power convertors; PWM power convertors; comparators (circuits); counting circuits; field programmable gate arrays; DC-DC converter; FPGA; counter-based PFM control; field programmable gate array; one-comparator scheme; positive-sloped ramp wave injection method; pulse-width-modulated control; voltage ripple; Capacitors; DC-DC power converters; Electromagnetic interference; Field programmable analog arrays; Field programmable gate arrays; Pulse width modulation; Space vector pulse width modulation; Switches; Switching frequency; Voltage control; One-comparator; PFM; counter-based;
Conference_Titel :
Industrial Electronics, 2009. ISIE 2009. IEEE International Symposium on
Conference_Location :
Seoul
Print_ISBN :
978-1-4244-4347-5
Electronic_ISBN :
978-1-4244-4349-9
DOI :
10.1109/ISIE.2009.5213775
