Electricity: motive power systems – Plural – diverse or diversely controlled electric motors – Running-speed control
Reexamination Certificate
2005-04-19
2005-04-19
Ip, Paul (Department: 2837)
Electricity: motive power systems
Plural, diverse or diversely controlled electric motors
Running-speed control
C318S034000, C318S049000, C318S599000, C388S811000, C361S018000
Reexamination Certificate
active
06882121
ABSTRACT:
In order to improve a control device for operating a load circuit having at least one electric motor, this control device comprising a control stage which generates a pulse width modulated control signal, a power stage supplying the load circuit and having an electronic switch activated by the pulse width modulated control signal, a freewheeling element connected in parallel to the load circuit and a blocking monitoring means which generates a measurement switch-off interval by suppressing at least one switch-on interval of the pulse width modulated control signal, monitors the voltage in the load circuit during the measurement switch-off interval, compares it to a limit value and generates a blocking state signal in accordance with the comparison, in such a manner that a differentiated analysis of the voltages occurring in the measurement switch-off interval is possible it is suggested that for monitoring at least two electric motors connected in parallel in the load circuit the blocking monitoring means carry out a test run with at least one measurement cycle, in which a voltage sampling is carried out at different defined points in time after the start of at least one measurement switch-off interval and that the voltages determined in the load circuit during the voltage samplings be compared with at least one limit value.
REFERENCES:
patent: 3818297 (1974-06-01), Ha et al.
patent: 4673851 (1987-06-01), Disser
patent: 4866356 (1989-09-01), Altendorf
patent: 5689394 (1997-11-01), Esser et al.
patent: 5708343 (1998-01-01), Hara et al.
patent: 5811948 (1998-09-01), Sato et al.
patent: 5892643 (1999-04-01), Esser et al.
patent: 5977743 (1999-11-01), Flock
patent: 6091887 (2000-07-01), Dieterle et al.
patent: 6236175 (2001-05-01), Mourad et al.
patent: 6621309 (2003-09-01), Roder et al.
patent: 6653810 (2003-11-01), Lo
patent: 6759820 (2004-07-01), Karwath
patent: 6774587 (2004-08-01), Makaran et al.
patent: 20030117093 (2003-06-01), Makaran et al.
patent: 20030210011 (2003-11-01), Dragoi et al.
patent: 20040027105 (2004-02-01), Nakamura et al.
patent: 1463614 (1970-02-01), None
patent: 44 29 998 (1996-02-01), None
patent: 197 02 949 (1998-07-01), None
patent: 199 49 896 (2001-01-01), None
patent: 10 014285 (1998-01-01), None
patent: 11 235078 (1999-08-01), None
Herke Dirk
Kanamueller Thomas
Alcoa Fujikura Gesellschaft mit beschraenkter Haftung
Ip Paul
Lipsitz Barry R.
McAllister Douglas M.
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