SUBSTANCE: proposed method of converting dc voltage into quasi-sinusoidal voltage with pulse-width modulation can be used in control systems of frequency converters. The conversion method involves matching the positive half-wave of the drive (sinusoidal) signal with the base saw-tooth signal, and the negative half-wave with the signal of the saw-toothed voltage, which is generated by shifting the base saw-toothed signal in time by a value, calculated in each cycle of the drive signal.

EFFECT: increased quality of operation of an electric drive in steady state and transient conditions due to elimination of dc components in the output voltage of the autonomous inverter at subfrequencies.

4 cl, 7 dwg

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(19) RU (11) 2348100 (13) C1

(51) IPC
H02M 7/527 (2006.01)
(12) DESCRIPTIONS OF INVENTION To the patent of Russian Federation
Status: of 03.03.2009 – operates

(21)    Application number registered: 2008100552/09
(22)    Application filing date: 2008.01.09
(24)    Date started of validity of the patent: 2008.01.09
(45)    Date: 2009.02.27
(56)    List of prior art documents: RU 2012989 C1, 15.05.1994. RU 2071634 C1, 10.01.1997. GB 2034539 A, 04.06.1980.

(72)    Inventor information: Chubukov Konstantin Aleksandrovich (RU); Donskoj Nikolaj Vasil’evich (RU); Nikitin Sergej Aleksandrovich (RU)
(73)    Grantee (asignee) information: Otkrytoe aktsionernoe obshchestvo “Vserossijskij nauchno-issledovatel’skij proektno-konstruktorskij i tekhnologicheskij institut relestroenija s opytnym proizvodstvom” (RU)
Mail address: 428000, Chuvashskaja Respublika, g.Cheboksary, pr. I. Jakovleva, 4, OAO “VNIIR”

Source:  Russian Tech News