Title :
A digital dither controlled step-up/step-down DC-DC converter with smooth transition
Author :
Ma, Yanzhao ; Wang, Hongyi ; Chen, Guican
Author_Institution :
Sch. of Electron. & Inf., Eng., Xian Jiaotong Univ., Xian, China
Abstract :
A step-up/step-down DC-DC converter with high efficiency and small output voltage ripple is proposed in this paper. To reduce the switching loss and improve the efficiency, the converter operates in buck or boost mode when the input voltage is much higher or lower than the output voltage. However, a large output voltage ripple appears at the boundary of buck mode and boost mode due to the speed limitation of standard analog circuit. A transition mode using a digital dither technique is adopted and the output voltage ripple is reduced when the input voltage is close to the output voltage. Furthermore, the average inductor current is also reduced in the proposed transition mode. The converter has been designed with a standard a 0.5 μm CMOS process. The peak efficiency is 96% and the output voltage ripple is reduced to less than 10 mV in the transition mode.
Keywords :
CMOS analogue integrated circuits; DC-DC power convertors; CMOS process; boost mode; buck mode; digital dither controlled step-up-step-down DC-DC converter; efficiency 96 percent; inductor current; input voltage; output voltage ripple; size 0.5 mum; standard analog circuit; transition mode; Batteries; Detectors; Inductors; Pulse width modulation; Switches; Voltage control; DC-DC converters; Digital dither; step-up/setp-down; transition mode;
Conference_Titel :
Electron Devices and Solid-State Circuits (EDSSC), 2011 International Conference of
Conference_Location :
Tianjin
Print_ISBN :
978-1-4577-1998-1
Electronic_ISBN :
Pending
DOI :
10.1109/EDSSC.2011.6117631
