Rechargeable battery overdischarge prevention circuit
US5397974A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 18, 1994 |
| Grant date | Mar 14, 1995 |
| Priority date | — |
| Expiry date | Jan 18, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J7/0031
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A first switch element is connected in series with a rechargeable battery, a second switch element is connected in parallel to the series circuit of the rechargeable battery and the first switch element, and a control circuit controls ON and OFF states of the first switch element and the second switch element. The control circuit is so constructed as to turn OFF the first switch element to stop discharging and at the same time turn ON the second switch element when the battery voltage becomes lower than a predetermined value. The second switch element maintains the first switch element in OFF state even when the battery voltage of the rechargeable battery rises by self resetting of the rechargeable battery. When a charging voltage is applied to the rechargeable battery, the control circuit then turns ON the first switch element and turns OFF the second switch element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.