Power conversion device

Details Power conversion device Power conversion device

2009-09-04

2011-12-20

Ro, Bentsu (Department: 2837)

Electricity: motive power systems

Synchronous motor systems

Brushless motor closed-loop control

C363S074000, C363S163000, C318S448000, C318S459000

Reexamination Certificate

active

08080958

ABSTRACT:
A power conversion device includes a main circuit that has switches connecting each phase of a three-phase AC power supply to each output phase, an LC filter having a reactor and a capacitor connected between the three-phase AC power supply and each bidirectional switch, and a current detector detecting an input current or a load current, and a four-step commutation device generating four steps on the basis of the polarity of the load current. The four-step commutation device sets times between the steps to a value more than zero so as to inhibit open circuit between output phases and short circuit between power supply phases, and sets the times between the steps in accordance with the polarity of the load current so as to cancel a distortion of an output voltage due to four-step commutation during a PWM cycle.

REFERENCES:
patent: 4833588 (1989-05-01), Schauder
patent: 5949672 (1999-09-01), Bernet
patent: 6603647 (2003-08-01), Briesen et al.
patent: 6704215 (2004-03-01), Simon
patent: 2005-020799 (2005-01-01), None
patent: 2005-348479 (2005-12-01), None
patent: 2006-320070 (2006-11-01), None
patent: 2007-57292 (2007-08-01), None

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