Title :
A quasi fixed frequency constant on time controlled boost converter
Author :
Xu, Xiaoru ; Wu, Xiaobo ; Yan, Xiaolang
Author_Institution :
Inst. of VLSI, Zhejiang Univ., Hangzhou
Abstract :
Continuous conduction mode (CCM) boost converter is difficult to compensate due to the right half plane (RHP) zero. This paper presents a quasi fixed frequency constant on time (COT) controlled boost converter, it has no loop compensation requirement. With the proposed COT control, pulse frequency modulation (PFM) comes free at light load, which improves the light load efficiency compared with traditional PWM control. A compact on-time generator that controls the operation frequency is proposed. And a current sink based feedback circuit is used to improve the quality of feedback signal.The COT controller is designed with 1.5 mum BCD process. Simulation results demonstrate that the COT boost converter has fast load transient response and quasi fixed frequency operation.
Keywords :
circuit feedback; control system synthesis; frequency control; power convertors; transient response; BCD process; COT controller design; boost converter; current sink; feedback circuit; frequency control; on-time generator; pulse frequency modulation; quasi fixed frequency constant on time control; size 1.5 mum; transient response; Circuit simulation; Feedback circuits; Frequency conversion; Frequency modulation; Lighting control; Pulse width modulation; Signal design; Signal processing; Space vector pulse width modulation; Transient response;
Conference_Titel :
Circuits and Systems, 2008. ISCAS 2008. IEEE International Symposium on
Conference_Location :
Seattle, WA
Print_ISBN :
978-1-4244-1683-7
Electronic_ISBN :
978-1-4244-1684-4
DOI :
10.1109/ISCAS.2008.4541890
