Short-circuit-proof transistor output stage, especially ignition output stage for motor vehicles
US5559661A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 11, 1994 |
| Grant date | Sep 24, 1996 |
| Priority date | — |
| Expiry date | Jul 11, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10D84/642
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A short-circuit-proof transistorized ignition output stage for motor vehicles, has a power transistor (10) connected in series to a primary winding (11) of an ignition coil (12), and a blocking arrangement including a first switching transistor for turning off the power transistor in the event of a very small voltage drop indicative of a short circuit in the coil (12). The voltage drop detector includes a second switching transistor (23') whose base-emitter path is connected across the primary winding (11) and whose collector-emitter path controls the base of a third switching transistor (25) of opposite conductivity type. The collector-emitter path of the third switching transistor (25) is connected in parallel to the base-emitter path of the first switching transistor (27) and the collector-emitter path of the first switching transistor is connected in parallel to the base-emitter path of the power transistor (10). Preferably, the entire output stage consists of a monolithic integrated circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.