Cordless power tool with overcurrent protection circuit permitting the overcurrent condition during specified time periods
US7521892B2 · kind B2 · utility
92Cited by
5References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 4, 2006 |
| Grant date | Apr 21, 2009 |
| Priority date | — |
| Expiry date | Apr 28, 2027 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A cordless power tool uses a lithium battery as a power source of a motor and is provided with an overcurrent protection circuit. The circuit allows an overcurrent to instantaneously flow at the start-up time of the motor and shuts off an overcurrent which may flow when the motor is brought into a locked state during the use of the power tool.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.