Adaptive On-time Control Circuit for Buck Converters

Wen Wei Chen, Jiann Fuh Chen

研究成果: Chapter

摘要

The conventional fixed-frequency pulse width modulated control scheme for power converters is commonly used with current-mode control circuit instead of voltage-mode control circuit. However, adaptive on-time control circuits can achieve a faster transient response than the pulse width modulated control scheme because the former uses a comparator to control the on-time generator without an error amplifier. Thus, adaptive on-time control circuits do not exhibit system loop delay from the error amplifier. However, adaptive on-time control circuits do not meet the requirements of output equipment or devices to achieve a faster transient response. This chapter shows that adaptive on-time control circuits with a quick dynamic response can achieve a faster transient response than those without a quick dynamic response for buck converters. Implementing a quick dynamic response with constant frequency on-time control circuit for buck converter is showed in this chapter. The concept uses the quick dynamic response to filter Vout at the load transient to change the on-time width dynamically, preventing Vout from dropping markedly. Finally, 12 V input voltage, 3.3 V output voltage, and 60 W output power with a quick dynamic response are implemented to achieve afast load transient response for the integrated circuit of the proposed constant frequency constant on-time control circuit for buck converter. Experimental and SIMPLIS simulation results are compared to verify the viability and superiority of the proposed approach

原文English
主出版物標題Power Systems
發行者Springer Verlag
頁面123-144
頁數22
版本9789811070037
DOIs
出版狀態Published - 2018 一月 1

出版系列

名字Power Systems
號碼9789811070037
ISSN(列印)1612-1287
ISSN(電子)1860-4676

    指紋

All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

引用此

Chen, W. W., & Chen, J. F. (2018). Adaptive On-time Control Circuit for Buck Converters. 於 Power Systems (9789811070037 編輯, 頁 123-144). (Power Systems; 編號 9789811070037). Springer Verlag. https://doi.org/10.1007/978-981-10-7004-4_5