Protection circuit for lithium battery pack serving as tool power source
US7486049B2 · kind B2 · utility
13Cited by
1References
6Claims
0Family size
Inventor
Key dates
| Filing date | Oct 13, 2006 |
| Grant date | Feb 3, 2009 |
| Priority date | — |
| Expiry date | Sep 5, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J7/007194
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A protection circuit for a lithium battery pack that serves as a power source of a power tool is arranged in the lithium battery pack and connected among a reversal/forward rotation circuit, a speed variation circuit, and a motor of the power tool. During a discharging process, the protection circuit detects battery voltage and temperature and when abnormal events occur, the protection circuit cuts off the discharge current. The protection circuit has a simple structure, low costs, and is easy to incorporate to the currently existing pressing-control circuit of the power tool.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.