公开(公告)号：US09634580B2

公开(公告)日：2017-04-25

申请号：US14772479

申请日：2014-03-04

申请人： DAIKIN INDUSTRIES, LTD.

发明人： Michihiro Nakagawa ,  Nobuki Kitano ,  Naoto Kobayashi

IPC分类号： H02M7/537 ,  H02M7/539 ,  H02M7/5387 ,  H02P27/12 ,  H02P21/30 ,  H02P21/12 ,  H02M1/00 ,  G01R19/00 ,  G01R31/42

CPC分类号： H02M7/539 ,  G01R19/0092 ,  G01R31/42 ,  H02M7/53875 ,  H02M2001/0009 ,  H02M2007/53876 ,  H02P21/12 ,  H02P21/30 ,  H02P27/12

摘要： A difference command generator generates a difference command equivalent to a time integral of three-phase voltage applied to an inductive load in a predetermined cycle in a complex plane. A vector command generator generates vector commands that are respectively time integrals of voltage vectors and compose the difference command. A switching signal generator generates switching signals for controlling three pairs of switches in an inverter on the basis of the vector commands. A phase-current computing unit obtains an estimated value for the three-phase current on the basis of a current flowing DC buses and the vector commands. At least two of the vector commands that are time integrals of different ones of the non-zero voltage vectors have magnitudes greater than or equal to a predetermined value corresponding to a minimum required amount of time to maintain switching patterns in order for the phase-current computing unit to detect the current.