Patent ID: 8397702
Filing Date: 2013-03-19
Classification: F02N,F02P,F23Q

Abstract:
1. A control circuit for use with an ignition system of a light-duty combustion engine, comprising: a charging circuit having a charge coil and an ignition capacitor, wherein the charge coil is coupled to the ignition capacitor and charges the ignition capacitor during operation; a timing circuit having a trigger coil and an ignition switching device, wherein the trigger coil is coupled to the ignition switching device and provides the ignition switching device with a first portion of the charge that is induced in the trigger coil, and the ignition switching device is coupled to the ignition capacitor and discharges the ignition capacitor during operation; and a shut down circuit having a manual stop switch, a shut down capacitor, and a shut down switching device, wherein the shut down capacitor is coupled to the trigger coil and is charged with a second portion of the charge that is induced in the trigger coil, and the shut down switching device is coupled to both the shut down capacitor and the ignition switching device; wherein following activation of the manual stop switch: i) the shut down switching device is initially turned ‘on’, ii) the shut down capacitor discharges through the shut down switching device and turns ‘on’ the ignition switching device, iii) the ignition switching device shorts the ignition capacitor and prevents it from charging, and iv) the shut down switching device remains ‘on’ so long as current from the shut down capacitor and/or the trigger coil flows through the shut down switching device.