Switching device having a polarity reversal protection system
US5648739A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 18, 1995 |
| Grant date | Jul 15, 1997 |
| Priority date | — |
| Expiry date | Sep 18, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/08122
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A switching device has at least a first connection and a second connection, as well as a control connection. The switching device includes at least a first transistor and a second transistor. A load is connected to the second connection of the switching device, and a control unit is connected to the control connection of the switching device. A power supply is normally connected to the first connection, and the second connection is normally connected to ground via the load. The switching device further includes a polarity reversal protection system for protecting the switching device and the load from damage in case of a polarity reversal, which occurs when the power supply is connected to the second connection through the load, and the first connection is connected to ground. The second transistor is connected in series between the first connection of the switching device and the first transistor. The second transistor is operated inversely with respect to the first transistor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.