Method and apparatus for expanded battery recognition in a battery charging system
US5696433A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 7, 1997 |
| Grant date | Dec 9, 1997 |
| Priority date | — |
| Expiry date | Mar 7, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A battery charging system (200) provides an expanded range of battery recognition. Battery (204) includes two zener diodes (224, 226) coupled in a cathode-to-cathode configuration between the battery's capacity resistor 220 and the battery's thermistor 222. The charger 202 biases the first zener diode (224) while latching the second zener diode (226) such that the value of the latched zener diode can be determined by the A/D ports (234, 236) of the charger (202). The charger (202) then biases the second zener diode (226) and latches the first zener diode (224) so that the value of the first latched zener diode (224) can be determined through A/D ports (234, 236) of the charger. The thermistor (222) and capacity resistor (220) are read by the A/D ports (234, 236) when neither of the diodes (224, 226) is biased. Hence, the charging system (200) provides four battery ID parameters with which to identify the battery.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.