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:
Jul. 20, 2021
Filed:
Jul. 16, 2019
Black & Decker Inc., New Britain, CT (US);
John D. Cox, Lutherville, MD (US);
Michael K. Forster, White Hall, MD (US);
John C. Vanko, Timonium, MD (US);
Daniel J. White, Baltimore, MD (US);
Bhanuprasad V. Gorti, Perry Hall, MD (US);
Matthew J. Velderman, Baltimore, MD (US);
Andrew E. Seman, Jr., Pylesville, MD (US);
Black & Decker Inc., New Britain, CT (US);
Abstract
A power tool is provided with a multi-phase brushless motor including a rotor and a stator having stator windings corresponding to at least three phases of the motor. A power switch circuit is provided including high-side and low-side power switches. A power supply interface receives alternating-current (AC) power from an AC power supply or battery direct-current (DC) power from one or more battery packs. A rectifier converts the AC power to a rectified DC voltage on a bus line. A capacitor is disposed across the bus line such that, within each half cycle of the AC power voltage waveform, the power switch circuit draws current from the AC power supply within a first time period and from the capacitor within a second time period, the capacitor having a capacitance value such that the first time period is greater than the second time period.