Electricity: motive power systems – Induction motor systems – Primary circuit control
Reexamination Certificate
2008-03-25
2008-03-25
Masih, Karen (Department: 2837)
Electricity: motive power systems
Induction motor systems
Primary circuit control
C318S636000, C318S801000, C318S800000, C388S825000, C388S831000, C388S901000
Reexamination Certificate
active
07348757
ABSTRACT:
Apparatus for reconstructing the phase currents of a multiphase load driven by a multiphase inverter fed by a DC link and controlled by a PWM controller, the apparatus including a sensor in the DC link, first and second sampling arrangements for sampling the current in the DC link by obtaining an output from said sensor, the first sampling arrangement obtaining a first sample of the current in the DC link during a first time period corresponding to a first switching pattern of said multiphase inverter and storing said first sample; the second sampling arrangement obtaining a second sample of the current in the DC link during a second time period after said first time period and corresponding to a second switching pattern of said multiphase inverter and storing said second sample; an A/D converter for converting said first sample to a digital signal during a time period after said first time period and for converting said second sample to a digital signal during a following third time period.
REFERENCES:
patent: 2003/0173946 (2003-09-01), Liu et al.
International Rectifier Corporation
Masih Karen
Ostrolenk Faber Gerb & Soffen, LLP
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