Multi-cell battery pack charge balancing circuit
US6114835A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 26, 1999 |
| Grant date | Sep 5, 2000 |
| Priority date | — |
| Expiry date | Jul 26, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J7/0018
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A charge balancing circuit incorporates a voltage threshold which determines when to initiate a charge balance mode in order to equalize the level of charge in at least two cells of a multi-cell battery pack. Charge balancing is initiated when the voltage level of a first cell reaches this second threshold. Charge balancing then continues by modifying the charges of the first balance cell and a second reference lesser charged cell until the voltage levels of the first and second cells are equal. A subsequent charge cycle will result in the cell with the greatest charge being balanced with another of lesser charge. In this manner, all of the cells of a multi-cell battery pack are charge balanced over the course of plural charge cycles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.