Control loop for pulse charging lithium ion cells
US5898294A · kind A · utility
15Cited by
23References
59Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 19, 1997 |
| Grant date | Apr 27, 1999 |
| Priority date | — |
| Expiry date | Aug 19, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Control circuitry is described for regulating charging current from a current source to a battery. The control circuitry includes a switch for transmitting the charging current from the current source to the positive terminal of the battery. A charge pump drives the gate terminal of the switch above the positive terminal voltage. A comparator stage with hysteresis gates the charge pump. A filtering stage senses the battery voltage and drives the comparator stage. The control circuitry controls the average value of the battery voltage by pulse width modulating the charging current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.