Battery monitoring and charging control unit
US5563496A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 14, 1994 |
| Grant date | Oct 8, 1996 |
| Priority date | — |
| Expiry date | Sep 14, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J2207/20
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A unit that can be a tiny module within a battery pack includes a microprocessor operating through onboard sensors and read circuitry to monitor battery current, voltage and temperature and to develop fast charge termination control data. Various termination schemes are available including negative delta V, dT/dt, dV/dt, absolute temperature, absolute voltage, and override timer. The microprocessor also operates to develop state of charge, percentage of capacity charge and other status data, to store such data along with setup and calibration data, in an EEPROM, to report data to a host periodically or when polled to and to operate automatically or at a user's request to initially perform and update a calibration as to actual battery capacity. During times when the pack is idle, the unit automatically reverts to a low-power mode in which measuring circuitry is deenergized but during such times, it operates periodically to compensate for self-discharge as a function of temperature. In the read circuitry, a ramp generator generates a linear ramp voltage that is compared with voltages proportional to battery voltage, supply voltage, battery current and temperature, using comparators c…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.