Electricity: electrical systems and devices – Safety and protection of systems and devices – Motor protective condition responsive circuits
Reexamination Certificate
2008-08-28
2011-10-04
Santana, Eduardo Colon (Department: 2837)
Electricity: electrical systems and devices
Safety and protection of systems and devices
Motor protective condition responsive circuits
C361S031000, C361S093100, C318S798000, C318S806000, C324S521000, C324S076770
Reexamination Certificate
active
08031446
ABSTRACT:
A method of detecting an output phase loss (OPHL) for a motor drive detects an abnormal OPHL operation when at least one phase of a three-phase current is continually zero. Each phase of the three-phase current is acquired, sampled, filtered, and compared. Hence, a corresponding zero-current counter value is continually added, and a corresponding abnormal current value is set as logic 1 when a zero-phase current of the three-phase current is continually zero. Finally, an OPHL certified value is set as logic 1 to confirm that the motor driver is operated in the abnormal OPHL operation. Therefore, a direct-current and an alternating-current OPHL can be detected before and after the motor driver is operated, respectively.
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Cheng Lung-Jay
Hsieh Ting-Chung
Huang Jen-Hsiang
Liao Shih-Chieh
Colon Santana Eduardo
Delta Electronics , Inc.
HDLS IPR Services
Shih Chun-Ming
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