Charge/discharge protection circuit and battery pack having the charge/discharge protection circuit
US6316915A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 1, 2000 |
| Grant date | Nov 13, 2001 |
| Priority date | — |
| Expiry date | Nov 1, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J7/00302
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A charge/discharge protection circuit of the present invention includes a first terminal to which a negative electrode of a charger is connected and an internal detector unit which has an input connected to the first terminal, and prevents the variation of the threshold voltage of the input transistors in a short-circuit detector unit and in an overcurrent detector unit when the improper charger is connected to the battery for a long time. An improper charger detector unit outputs a detection signal when an improper charger is connected to the battery pack, in response to a voltage supplied to the first terminal by the improper charger. A connection cutoff unit cuts off, when the detection signal is output by the improper charger detector unit, the connection between the internal detector unit input and the first terminal, so that, when the improper charger is connected to the battery pack, a voltage of the input of the internal detector unit is avoided from being lower than a voltage of a second terminal to which a negative electrode of the battery is connected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.