Ignition system
US4738239A · kind A · utility
8Cited by
9References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 31, 1987 |
| Grant date | Apr 19, 1988 |
| Priority date | — |
| Expiry date | Jul 31, 2007 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02P3/0435
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An inductive ignition system for a spark ignited internal combustion engine. An N-channel field effect transistor (FET) is connected in series with the primary winding of an ignition coil. The primary winding and the FET are connected in a high side drive connection. An NPN transistor has its collector-emitter circuit connected between the gate and source of the FET. When the FET is biased off a flyback voltage is developed across the primary winding which is used to bias the NPN transistor conductive thereby clamping the gate and source voltage of the FET together to keep the FET switched off.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.