Design of a Limiting Reverse Current Circuit for Synchronous BUCK Converter

HUANG Su-ping; FENG Quan-yuan

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Design of a Limiting Reverse Current Circuit for Synchronous BUCK Converter

更新时间：2026-09-04

- Design of a Limiting Reverse Current Circuit for Synchronous BUCK Converter
- Vol. 31, Issue 2, Pages: 35-38(2014)
- 作者机构：
  
  西南交通大学微电子研究所,四川,成都,610031
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2014
- 稿件说明：
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黄苏平, 冯全源. 一种同步BUCK变换器反向限流电路的设计[J]. 微电子学与计算机, 2014, 31(2): 35-38.

HUANG Su-ping, FENG Quan-yuan. Design of a Limiting Reverse Current Circuit for Synchronous BUCK Converter[J]. 2014, 31(2): 35-38.
黄苏平, 冯全源. 一种同步BUCK变换器反向限流电路的设计[J]. 微电子学与计算机, 2014, 31(2): 35-38. DOI：

HUANG Su-ping, FENG Quan-yuan. Design of a Limiting Reverse Current Circuit for Synchronous BUCK Converter[J]. 2014, 31(2): 35-38. DOI：

摘要

同步BUCK变换器在轻载模式下会出现电感电流倒灌现象.若是反向电流过大，将会增加系统的导通损耗，降低芯片的效率.针对这一问题，设计了一款反向限流电路，该电路利用NMOS开关管的体效应二极管将负载的能量转移给输入电源，从而有效地限制了电流的倒灌.该反向限流电路基于0.5μm BCD工艺，在HSPICE上进行系统仿真.仿真结果证明，轻载时与不加反向限流电路的系统相比效率提高了2%.

Abstract

The phenomenon that inductor current flow backward appears when synchronous BUCK converter works in light load mode.If the reverse current is too large

not only the conduction loss will be increased

but the efficiency of the system will be reduced.According to this problem a limiting reverse current circuit is designed.By using the body effect diode of NMOS switch tube

the energy of the load can be transferred to power

so the happening of current backward flowing be avoided.The limiting reverse current is based on 0.5μmBCD technology

and has been carried on the system simulation on HSPICE.The simulation result shows that the efficiency with limiting reverse current circuit be improved by 2% compared to others without the proposed circuit.

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