Micro-peak detection quick charger
US6218808A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 24, 2000 |
| Grant date | Apr 17, 2001 |
| Priority date | — |
| Expiry date | Mar 24, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J7/007182
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An apparatus and method for fast battery charging are provided. A fast battery charger applies high charging current to a battery to minimize charging time. Micropeak detection of the battery voltage prevents overcharging of the battery cells, thereby preventing degradation of battery capacity over time. Noise reduction throughout the system as well as improved detection resolution allows for micropeak detection. A linear power supply eliminates switch noise. The sampling frequency is synchronized with the power supply, eliminating error due to power supply variation. Sleeping sampling is performed to overcome noise due to operation of the CPU. Improved measurement resolution is obtained via a 10-bit analog to digital converter. A subtraction technique maintains the high measurement resolution. Digital signal processing filters out noise providing for a more accurate voltage measurement
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.