Design of a Current Sensing Circuit without Power Loss for DC-DC Converter

DOI

10.2991/meic-15.2015.231How to use a DOI?

Keywords

DC-DC converter;current mode;over-current protection;conduction voltage drop;current sensing technology without power loss

Abstract

In order to decrease the additional power loss in DC-DC converter caused by current detection, a current sensing technique without power loss is proposed. Power MOSFET is being widely used in low and medium power DC-DC converters; it can be regarded as a resistor in the condition of turn-on. Thus, based on the analysis of traditional kinds of current detection technology, a novel current sensing technology is proposed, which senses the current by using the conduction voltage drop of the power devices in DC-DC converter, the accuracy of sensing current can be improved by adjusting the resistor connected in both ends of the transconductance amplifier, no additional current sensing circuit is needed, and the additional power loss can be avoided. The DC-DC converter operating at the frequency of 1MHz is simulated, and the simulation results verify the accuracy and feasibility of the designed circuit.

Copyright

© 2015, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Shulin Liu
AU  - Lili Qi
PY  - 2015/04
DA  - 2015/04
TI  - Design of a Current Sensing Circuit without Power Loss for DC-DC Converter
BT  - Proceedings of the 2015 International Conference on Mechatronics, Electronic, Industrial and Control Engineering
PB  - Atlantis Press
SP  - 1013
EP  - 1016
SN  - 2352-5401
UR  - https://doi.org/10.2991/meic-15.2015.231
DO  - 10.2991/meic-15.2015.231
ID  - Liu2015/04
ER  -