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:
May. 15, 2018
Filed:
Jun. 13, 2016
Trane International Inc., Davidson, NC (US);
Don A. Schuster, Lindale, TX (US);
Chuan Yan, Tyler, TX (US);
Trane International Inc., Davidson, NC (US);
Abstract
A power factor optimized variable speed drive unit for an electric motor of an HVAC device is disclosed. In an embodiment, the unit includes a selectively-activatable power factor correction unit operatively associated with a switched mode power supply unit. A power measurement unit measures the input power of the electric motor. A comparator unit compares the motor input power to a predetermined threshold. The comparator unit activates the power factor correction unit when the input power of the electric motor is above the threshold, and deactivates the power factor correction unit when the input power of the electric motor falls below the threshold. In an embodiment, motor input power is determined by the product of motor load current and motor speed.