Aalborg Inverter - A New Type of “Buck in Buck, Boost in Boost” Grid-Tied Inverter

Weimin Wu, Junhao Ji, Frede Blaabjerg

Research output: Contribution to journalJournal articleResearchpeer-review

87 Citations (Scopus)


This paper presents a new family of high efficiency dc/ac grid-tied inverter with a wide variation of input dc voltage. It is a “boost in boost, buck in buck” inverter, meaning that only one power stage works at high frequency in order to achieve minimum switching loss. The minimum voltage drop of the filtering inductor in the power loop is achieved to reduce the conduction power loss in both “boost” and “buck” mode. The principle of operation is demonstrated through the analysis on the equivalent circuits of a “half-bridge” single-phase inverter. The theoretical analysis shows that when input dc voltage is larger than the magnitude of the ac voltage, it is a voltage-source inverter, and on the contrary it is current-source inverter in the other mode. A 220 V/50 Hz/ 2000 W prototype has been constructed. Simulations and experiments show that it has a good control and system performance.
Original languageEnglish
JournalI E E E Transactions on Power Electronics
Issue number9
Pages (from-to)4784 - 4793
Number of pages10
Publication statusPublished - Sep 2015


  • Boost in boost
  • Buck in buck
  • CL filter
  • Current-source inverter (CSI)
  • Efficiency
  • LCL filter
  • Voltage-source inverter (VSI)


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