JOHN CASE TOMPKINS
Pilots in Refugio, TX
License number
Texas A1919714
Category
Airmen
Type
Authorized Aircraft Instructor
Address
Address
PO Box 69, Refugio, TX 78377
Professional information
Cordless Battery Charger
US Patent:
4857820, Aug 15, 1989
Filed:
Sep 8, 1987
Appl. No.:
7/094115
Inventors:
John C. Tompkins - Refugio TX
Charles E. Cook - Refugio TX
Charles E. Cook - Refugio TX
International Classification:
H02J 700
US Classification:
320 2
Abstract:
A rechargeable emergency portable battery charger for starter motor storage batteries. The device includes a sealed lead acid battery as a source of energy. An oscillator circuit connected to a transformer generates 3 V in its secondary. This voltage is rectified and added in series to the 12 V of the self-contained battery to provide charging current to a starter motor storage battery. Connection is made via a cigarette lighter socket in the disabled vehicle. Current is limited to approximately 4 amps so as to limit heat dissipation to a safe level. Furthermore, a voltage-sensing circuit determines if the voltage of the starter storage battery is below approximately 6 V or is shorted to ground. In either case, output current is further limited to the point of cut-off. Recharging the self-contained battery is made possible by a switch that connects the cigarette lighter of a running car directly to the self-contained battery of the charger.