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:
Jun. 05, 2012
Filed:
Oct. 02, 2009
Ivan Jadric, 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);
Konstantin Borisov, York, PA (US);
Scott Victor Slothower, Dillsburg, PA (US);
Kanishk Dubey, York, PA (US);
John C. Hansen, Spring Grove, PA (US);
Ivan Jadric, 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);
Konstantin Borisov, 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 is arranged to receive an input AC voltage at a fixed AC input voltage and provide an output AC power at a variable voltage and variable frequency. The variable speed drive includes a converter connected to an AC power source providing the input AC voltage. The converter is arranged to convert the input AC voltage to a DC voltage. A DC link is connected to the converter. The DC link filters and stores the DC voltage from the converter. An inverter is connected to the DC link. A motor connectable to the compressor for powering the compressor. An active filter connected in parallel with the motor. The active filter is arranged to generate high frequency currents having a magnitude and opposite polarity, with respect to the output AC power of the variable speed drive. The high frequency currents generated by active filter substantially cancel out high frequency currents flowing into the motor.