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. 10, 2024
Filed:
May. 27, 2020
Black & Decker Inc., New Britain, CT (US);
Snehal S. Choksi, Hampstead, MD (US);
Geoffrey S. Howard, Columbia, MD (US);
Daniel L. Schwarz, Timonium, MD (US);
Thomas C. Kohler, Bel Air, MD (US);
Keith Hopwood, Fremont, MD (US);
Richard A. Sy, Fremont, CA (US);
Chun-Te Chin, Union City, CA (US);
Jiunping Huang, Tainan, TW;
Minghuang Hung, Tainan, TW;
BLACK & DECKER INC., New Britain, CT (US);
Abstract
A power supply apparatus is provided including a housing, at least one battery receptacle for receiving at least one removable battery pack, an inverter that converts a direct-current (DC) signal from the at least one battery pack to an alternating-current (AC) signal, and a controller that applies a pulse-width modulation (PWM) signal to the inverter to shape the AC signal with a lower harmonic distortion relative to a square wave. For each full cycle of the AC signal, the controller sets the duty cycle to approximately 100% within a first period corresponding to a peak area of the AC signal, to less than approximately 100% but greater than approximately 0% within a second period in which the AC signal transitions from the peak to a zero-cross following the first period, and to 0% within a third period corresponding to the zero-cross of the AC signal following the second period.