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Design of a Luenberger Observer-based Current Sensorless Multi-loop Control for Boost Converters

  • Li, Xutao ;
  • Chen, Minjie ;
  • Shinohara, Hirofumi ;
  • Yoshihara, Tsutomu
  • Received : 2016.02.15
  • Accepted : 2016.02.24
  • Published : 2016.02.29

Abstract

Multi-loop control of a boost converter needs a current-sensing circuit to detect the inductor current. Current sensorless multi-loop control reduces the cost, size and weight of the converter. The Luenberger observer (LO) is widely used to estimate the inductor current for current sensorless control of a switching converter. However, the design of the LO-based sensorless multi-loop control has not been well presented, so far. In this paper, a closed-loop characteristics evaluation method is proposed to design an LO-based current sensorless multi-loop control for boost converters. Simulations show evaluations of the closed-loop characteristics. Practical experiments on a digital processor confirm the simulations.

Keywords

Boost converter;Sensorless current control;Luenberger observer;Closed-loop characteristics

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