Thomas C Carmichael

US Patent:

39411117, Mar 2, 1976

Filed:

Sep 10, 1973

Appl. No.:

5/395908

Inventors:

Thomas F. Carmichael - Drayton Plains MI
Richard J. Maier - Pontiac MI

Assignee:

Syncro Corporation - Oxford MI

International Classification:

F02P 308
F02P 306

US Classification:

123148E

Abstract:

In one embodiment, a capacitive discharge ignition system has a charge coil and an ignition coil including primary and secondary windings wound on a common stator structure. The charge coil is coupled to the primary winding of the ignition coil by an SCR and a main capacitor such that the capacitor is first charged by the charge coil and then discharged through the SCR into the primary winding of the ignition coil when the SCR fires. During discharge of the capacitor, the charge coil also supplies current to the primary winding of the ignition coil. The SCR may be fired by a triggering circuit which includes a capacitor network connecting the gate of the SCR to the charge winding and main capacitor or through a breakdown effect of the SCR absent the provision of a triggering circuit. The circuit arrangement obviates the need for the usual charging diode between the charging coil and the main capacitor. Several embodiments of triggering circuit for the SCR are disclosed.

US Patent:

48299707, May 16, 1989

Filed:

Oct 9, 1987

Appl. No.:

7/107628

Inventors:

Thomas F. Carmichael - Drayton Plains MI

Assignee:

Syncro Corporation - Troy MI

International Classification:

F02P 306

US Classification:

123595

Abstract:

A means for readily changing the ignition system of an existing internal combustion engine to a solid state capacitive discharge ignition system which comprises an auxiliary coil, a primarty ignition coil and a secondary ignition coil wound on a single leg of a stator. The stator is designed with one or more additional legs which complete a conductive path for the time varying flux, and adapt the stator for mounting on the existing structure of the engine. In addition, two legs of the stator which define a flux path may each be divided into two segments at their outer extremity, one of each pair being slightly longer than the other so as to create two different size air gaps for each leg. A washer-like element may be used in cooperation with the above structure to change the position of the rotor relative to the crankshaft so as to alter the timing of the ignition system.

US Patent:

40560880, Nov 1, 1977

Filed:

Apr 12, 1974

Appl. No.:

5/460271

Inventors:

Thomas F. Carmichael - Drayton Plains MI

Assignee:

Syncro Corporation - Oxford MI

International Classification:

F02P 308

US Classification:

123148E

Abstract:

A capacitive discharge ignition system having a charge coil and an ignition coil including primary and secondary windings wound on a common stator structure. The charge coil is coupled to the primary winding of the ignition coil by an SCR and a main capacitor such that the capacitor is first charged by the charge coil and then discharged through the SCR into the primary winding of the ignition coil when the SCR fires. During discharge of the capacitor, the charge coil also supplies current to the primary winding of the ignition coil. A shorted turn is located on one leg of the stator structure and a diode is connected in parallel with the charge coil to reduce the maximum peak potential supplied by the charge coil to reduce the maximum potential rating requirements of the ignition circuit components.