Method of operating drill with solid state speed control
US7861796B2 · kind B2 · utility
45Cited by
67References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 9, 2009 |
| Grant date | Jan 4, 2011 |
| Priority date | — |
| Expiry date | Mar 1, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S388/937
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A method of operating a hand power tool in one embodiment includes generating a variable speed control signal with a solid state switch that corresponds to a selected speed for a motor, generating a pulse width modulated (PWM) signal corresponding to the variable speed control signal, generating H-bridge driving signals for an H-bridge circuit in correspondence with the PWM signal, and selectively coupling a motor to a power source using the H-bridge circuit in accordance with the H-bridge driving signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.