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:
Dec. 25, 2012
Filed:
Oct. 02, 2009
Konstantin Borisov, York, PA (US);
Zhiqiao Wu, York, PA (US);
Michael S. Todd, Jacobus, PA (US);
Justin Drew Warner, Harrisburg, PA (US);
Shreesha Adiga Manoor, York, PA (US);
Ivan Jadric, York, PA (US);
Scott Victor Slothower, Dillsburg, PA (US);
Kanishk Dubey, York, PA (US);
John C. Hansen, Spring Grove, PA (US);
Konstantin Borisov, York, PA (US);
Zhiqiao Wu, York, PA (US);
Michael S. Todd, Jacobus, PA (US);
Justin Drew Warner, Harrisburg, PA (US);
Shreesha Adiga Manoor, York, PA (US);
Ivan Jadric, York, PA (US);
Scott Victor Slothower, Dillsburg, PA (US);
Kanishk Dubey, York, PA (US);
John C. Hansen, Spring Grove, PA (US);
Johnson Controls Technology Company, Holland, MI (US);
Abstract
A drive system for a compressor of a chiller system includes a variable speed drive. The variable speed drive receives an input AC power at a fixed input AC voltage and a fixed input frequency, and provides an output AC power at a variable voltage and variable frequency. The variable speed drive includes a converter connected to an AC power source. The converter is arranged to convert the input AC voltage to a DC voltage. A DC link is connected to the converter and configured to filter and store the DC voltage from the converter. An inverter is connected to the DC link. A motor is connectable to the compressor for powering the compressor. A controller is arranged to control switching in the converter and the inverter. The controller is arranged to apply randomized pulse width modulation to vary the switching frequency of transistors in the converter and the inverter at each switching cycle. The motor may be a permanent magnet synchronous motor.