Title:
CYCLE-BY-CYCLE CURRENT LIMIT FOR POWER TOOLS HAVING A BRUSHLESS MOTOR
Document Type and Number:
WIPO Patent Application WO/2015/179364
Kind Code:
A3
Abstract:
A handheld AC power tool is provided. The power tool is comprised generally of: a brushless DC motor; a power cord connectable to an AC power socket; a converter circuit configured to receive input power from the power cord and operable to output a DC bus voltage, a switching arrangement interposed between the electric motor and the converter circuit; a motor drive circuit interfaced with the motor switches; and a power switch operable by a user to selectively energize the motor drive circuit and thereby power on the tool. The converter circuit includes a rectifier and a capacitor electrically coupled across the rectifier, such that the capacitor has capacitance sized to produce a DC bus voltage whose magnitude from an AC power source is substantially same as magnitude of voltage from a DC power source.
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Inventors:
FORSTER MICHAEL K (US)
VANKO JOHN C (US)
GORTI BHANUPRASAD V (US)
GOTTESMAN TAI (US)
VANKO JOHN C (US)
GORTI BHANUPRASAD V (US)
GOTTESMAN TAI (US)
Application Number:
PCT/US2015/031518
Publication Date:
January 28, 2016
Filing Date:
May 19, 2015
Export Citation:
Assignee:
BLACK & DECKER INC (US)
International Classes:
H02P29/02; H02M1/32; B24B23/02; H02H7/08
Foreign References:
| US20120235661A1 | 2012-09-20 | |||
| US20060221528A1 | 2006-10-05 | |||
| US20030132725A1 | 2003-07-17 |
Attorney, Agent or Firm:
MACINTYRE, Timothy D. et al. (Dickey & Pierce P.L.C.,P.O. Box 82, Bloomfield Hills Michigan, US)
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