Charging method and circuit using indirect current sensing
US8493035B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 21, 2005 |
| Grant date | Jul 23, 2013 |
| Priority date | — |
| Expiry date | Feb 17, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M1/0009
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention relates to a charging circuit and method for generating a charging current supplied to an output terminal (15) to which a battery (40) to be charged is connected. The charging current is indirectly sensed to generate a sensing current having a predetermined relation to the charging current. This sensing current is then compared to a generated predetermined reference current, wherein the charging current is controlled in response to the result of the comparison. Thereby, accuracy, system costs and power efficiency can be increased as a low-ohmic precision resistor is no longer required in the charge current branch of the circuit. Furthermore, the proposed solution enables a simple implementation of the circuit as an integrated circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.