Input stage for an ignition control circuit
US4429235A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 27, 1981 |
| Grant date | Jan 31, 1984 |
| Priority date | — |
| Expiry date | Aug 27, 2001 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02P3/0453
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An input stage for an ignition control circuit is provided for producing an output signal from a comparator which switches the primary current circuit of the ignition coil in dependence on a control signal in which the control signal causes alternate switching of two current multipliers, a first charging current determined by a charging resistance and a second charging current determined by the first current multiplier charges a first capacitor, a third charging current derived from the second charging current charges a second capacitor, a first discharge current determined by a discharging resistance and a second discharge current determined by the second current multiplier discharges the first capacitor, a third discharging current derived from the second charging current discharges the second capacitor and a comparator compares the voltage at the second capacitor with a reference voltage to produce an output signal for switching the primary current of the ignition coil.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.