Apparatus in ignition systems
US4757797A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 24, 1987 |
| Grant date | Jul 19, 1988 |
| Priority date | — |
| Expiry date | Mar 24, 2007 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02P3/0846
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A circuit for generating a charge voltage in a capacitive ignition system having an inductive source for producing a voltage substantially below the required charge voltage. The circuit includes, in series, an electronic switch and a resistor connected across the voltage source to form a controllable current path. Connected parallel thereto is a charging circuit for the capacitive ignition system. A control circuit is connected across the resistor and is adapted to control the state of the electronic switch. The control circuit also has a self-holding circuit. During the build-up of the source voltage, the electronic switch is in its closed state resulting in a heavy current flow therethrough. This in turn results in a build-up of voltage across the resistor actuating the control circuit. The control circuit causes the electronic switch to change into a cutoff state, thereby causing a build-up of the charge voltage for the capacitive ignition system. The self-holding circuit acts to keep the control circuit in a condition for holding the electronic switch in the cutoff state during the presence of the voltage pulse generated by the source.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.