The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 04, 2011
Filed:
Aug. 28, 2008
Ting-chung Hsieh, Taoyuan Shien, TW;
Shih-chieh Liao, Taoyuan Shien, TW;
Jen-hsiang Huang, Taoyuan Shien, TW;
Lung-jay Cheng, Taoyuan Shien, TW;
Ting-Chung Hsieh, Taoyuan Shien, TW;
Shih-Chieh Liao, Taoyuan Shien, TW;
Jen-Hsiang Huang, Taoyuan Shien, TW;
Lung-Jay Cheng, Taoyuan Shien, TW;
Delta Electronics, Inc., Taoyuan, TW;
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.