Ignition control integrated circuit having substrate injection preventing means
US4574221A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 4, 1984 |
| Grant date | Mar 4, 1986 |
| Priority date | — |
| Expiry date | Jan 4, 2004 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02P3/0552
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
There is disclosed an ignition control circuit of the type which facilitates the storage of energy in an external inductive load during a dwell period and the release of the stored energy from the inductive load through a spark gap at the end of the dwell period. The circuit includes switch means for conducting current through the inductive load during the dwell period, and an integrated circuit for turning the switch means on during the dwell period and off at the end of the dwell period. The integrated circuit includes an output transistor for controlling the switch means, a current source for driving the output transistor, and control means for enabling the current source during the dwell period and disabling the current source at the end of the dwell period.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.