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:
Sep. 30, 2003
Filed:
Mar. 09, 1999
Simon Wall, Thousand Oaks, CA (US);
Capstone Turbine Corporation, Chatsworth, CA (US);
Abstract
Distortion compensation controller reduces harmonic distortion in an AC circuit current and/or voltage of a power converter bridge operating under digital current and/or voltage control. Within distortion compensation controller, an array of memory locations are used, each corresponding to a particular angle range in the AC cycle. Enough memory locations are allocated to cover all of the AC cycle. For each of these memory locations, historical information is collected over a number of AC cycles about the distortion measured during the corresponding angle range in the AC cycle. Using the historical information, a compensation signal is calculated for use at that angle in the next AC cycle. As the AC cycle progresses, the appropriate compensation signal is added to the output of a conventional current controller. In this way, a near perfect sinusoid can be achieved in the steady state for the current/voltage waveform in the AC circuit.