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:
Mar. 07, 2017
Filed:
Jan. 28, 2014
Applicant:
Johnson Controls Technology Company, Holland, MI (US);
Inventors:
Assignee:
Johnson Controls Technology Company, Holland, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G05B 11/28 (2006.01); H02P 6/00 (2016.01); H02M 1/12 (2006.01); F02M 25/08 (2006.01);
U.S. Cl.
CPC ...
H02P 6/002 (2013.01); F02M 25/0836 (2013.01); H02M 1/12 (2013.01); H02P 6/28 (2016.02);
Abstract
A system or method controlling a variable speed drive based on PWM techniques, wherein a first PWM method is used when the input current is less than a predetermined threshold value, for higher efficiency and lower total harmonic distortion (THD); and a second PWM method comprising a discontinuous modulation signal is used when the input current is greater than the predetermined threshold value for higher efficiency. By doing so, the maximum efficiency of VSD within the whole operation range can be achieved.