Magnetically coupled autonomous battery equalization circuit
US6222344A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 6, 1999 |
| Grant date | Apr 24, 2001 |
| Priority date | — |
| Expiry date | Dec 6, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J7/0014
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A battery equalization circuit for equalizing charge between at least first and second series-connected batteries, where each battery has a positive end and a negative end, with the positive end of the second battery coupled to the negative end of the first battery at a common node, and using: a switching circuit connectable to the positive end of the first battery at a positive node and the negative end of the second battery at a negative node; a transformer having first and second magnetically coupled windings, each with a first end defining a polarity of the winding and a second opposing end; and a transformer reset circuit coupled from the windings of the transformer to the positive and negative nodes. The switching circuit acts to simultaneously couple the first and second windings in parallel with the first and second batteries, respectively, in the same polarity such that a charge is transferred between the first and second batteries as a function of a charge imbalance therebetween. The transformer reset circuit couples one of the first and second windings in parallel with one of the first and second batteries in an opposite polarity to direct reset current from the transfor…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.