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:
Feb. 28, 2017
Filed:
Feb. 28, 2015
Rockwell Automation Technologies, Inc., Mayfield Heights, OH (US);
Zhendong Zhang, Mequon, WI (US);
Takayoshi Matsuo, Brown Deer, WI (US);
David Leggate, New Berlin, WI (US);
Timothy M. Rowan, Wauwatosa, WI (US);
Russel J. Kerkman, Milwaukee, WI (US);
Bing Li, Singapore, SG;
Rockwell Automation Technologies, Inc., Mayfield Heights, OH (US);
Abstract
Methods and apparatus are presented for sampling low side inverter phase currents, in which current sampling is selectively delayed in a given PWM cycle by a non-zero sampling delay time value from a nominal sample time if the middle pulse width value is less than a non-zero first threshold to facilitate adequate signal settling for accurate current measurement, and if a middle total continuous on-time near the end of the given PWM cycle is less than a non-zero second threshold, the middle total continuous on-time is selectively extended by adding a non-zero adjustment offset time value to a middle pulse width value for a next PWM cycle.