Protective arrangement for an electromagnetic load
US4733326A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 15, 1986 |
| Grant date | Mar 22, 1988 |
| Priority date | — |
| Expiry date | Apr 15, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2217/0072
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A protective arrangement for an electromagnetic load is disclosed. In this protective arrangement, the load and a control transistor form a series circuit from the battery voltage to ground and a series circuit of a free-wheeling transistor and a free-wheeling diode is connected in parallel with the load. By coupling the base of the free-wheeling transistor to ground, this transistor is made continuously conductive provided that the polarity of the supply voltage is correct, whereas, this free-wheeling transistor blocks if the supply voltage polarity is incorrect. This assures that none of the components is in danger of being destroyed in the event that the polarity of the supply voltage is incorrect.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.