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:
Mar. 07, 2023
Filed:
Jan. 24, 2019
Black & Decker Inc., New Britain, CT (US);
Zollie W. Privett, Jr., Baltimore, MD (US);
Craig A. Oktavec, Forest Hill, MD (US);
David J. Smith, Columbia, MD (US);
Matthew J. Velderman, Baltimore, MD (US);
Colin C. Crosby, Baltimore, MD (US);
Pradeep Pant, Cockeysville, MD (US);
Kyle J. Christophersen, Lutherville-Timonium, MD (US);
Daniel F. Nace, Towson, MD (US);
James H. Stiles, III, Baltimore, MD (US);
Floyd E. Moreland, IV, York, PA (US);
Black & Decker Inc., New Britain, CT (US);
Abstract
A power tool is provided including a motor case and a handle portion. An electric motor having a drive shaft is mounted within the motor case. A circuit board is disposed in the handle portion to accommodate a motor drive circuit. The motor drive circuit includes a rectifier configured to receive an alternating current from an alternating current (AC) power source and convert it to a direct current supplied to a DC power bus, and a bridge circuit having motor switches connected between the rectifier and the electric motor. A bus capacitor is mounted on the circuit board and coupled across the DC power bus. An auxiliary capacitor having higher capacitance than the bus capacitor is switchably coupled across the DC power bus. The handle portion includes a support member protruding radially outwardly to accommodate the auxiliary capacitor.