Ignition coil with spiral-back pyramid windings
US5448217A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 16, 1993 |
| Grant date | Sep 5, 1995 |
| Priority date | — |
| Expiry date | Sep 16, 2013 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02P3/02
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An ignition coil is disclosed that includes a primary coil, a secondary coil and a core about which the primary and secondary coil are disposed. The secondary coil has in inner diameter greater than the diameter of the primary coil. The primary coil is disposed on the core and the secondary coil is disposed about the primary coil. The secondary coil includes a spiral-back pyramid winding configuration which results in a desired distributed capacitance for the secondary windings thereby providing desired electrical characteristics for a resonant circuit. The winding layers of the secondary coil decrease in the number of turns as the coil is wound to achieve a desired distributed capacitance of the coil. A spiral-back winding technique decreases adjacent winding layer voltages so that the inter-layer insulation requirements are reduced to a lower value thereby decreasing the insulation thickness of the secondary coil.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.