Resistive matching with a feed-forward controlled non-synchronous boost rectifier for electromagnetic energy harvesting

Plamen Proynov, Georgy Szarka, Bernard Stark, Neville McNeill

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

3 Citations (Scopus)


Impedance matching techniques have been shown to extract close to the maximum theoretical power from kinetic energy harvesters. The output impedance of electromagnetic energy harvesters is frequency-dependent, which must be compensated for by the interfacing power electronics. Switched mode power converters are used to synthesise optimum, matched load impedance, controlled typically by varying duty ratio pulse width modulated gate signals. The emulated input impedance of the power converter is affected by factors such as the input and output voltage levels. In this paper, the non-synchronous boost rectifier, operated entirely in discontinuous current conduction mode, is controlled dynamically to ensure that the emulated input resistance remains at a set value under varying input and output conditions. This is achieved by employing a feed-forward control scheme that is based on calculating the time-varying optimum duty ratio as a function of the excitation frequency, the generated voltage and the converter output voltage, following the analytically derived equations. Experimental results are obtained using the proposed feed-forward control method implemented on a real-time platform. The results demonstrate the effectiveness of the presented control in terms of emulating a set resistance, and the average power that can be extracted using optimum resistance matching over a range of excitation frequencies.
Original languageEnglish
Title of host publication2013 Twenty-Eighth Annual IEEE Applied Power Electronics Conference and Exposition (APEC)
Place of PublicationPiscataway, N.J.
Number of pages6
ISBN (Print)978-1-4673-4354-1
Publication statusPublished - 17 Mar 2013
Externally publishedYes
Event28th IEEE Applied Power Electronics Specialist’s Conference -
Duration: 1 Mar 201331 Mar 2013


Conference28th IEEE Applied Power Electronics Specialist’s Conference


  • voltage control
  • resonant frequency
  • energy harvesting
  • impedance matching

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