Battery reversal protection
US4423456A · kind A · utility
1,068Cited by
15References
1Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 13, 1981 |
| Grant date | Dec 27, 1983 |
| Priority date | — |
| Expiry date | Nov 13, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S320/15
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A semiconductor circuit for protecting battery powered electronic devices from damage due to polarity reversal. A metal oxide semiconductor is employed in series with the power source to switch the power input as appropriate. A first embodiment simply disables the power source input upon improper polarity. A second embodiment actually reverses the effective polarity to the load. Because the source-to-drain impedance of the metal oxide semiconductor device is resistive, a number of protection devices may be used in parallel to achieve an arbitrarily low voltage drop between power source and load for a given current drain.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.