Battery charger for preventing both overshoot charging current and overcharged battery voltage during charging mode transition
US7663346B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 2008 |
| Grant date | Feb 16, 2010 |
| Priority date | — |
| Expiry date | Sep 30, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J7/007182
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A battery charger for charging a battery through controlling a charging regulation circuit is provided. The battery charger includes a current sensing unit and an operational amplifier. The current sensing unit monitors a charging current applied to the battery when the battery charger operates under a constant current mode, thereby generating a first regulation signal to the charging regulation circuit. The operational amplifier compares a battery voltage of the battery with a first reference voltage to generate a comparison result. When the battery charger operates under the constant current mode, the comparison result controls a charging mode transition from the constant current mode to a constant voltage mode. When the battery charger operates under the constant voltage mode, the comparison result acts as a second regulation signal to control the charging regulation circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.