KEITH E CROUCH
Electrician in Pittsfield, MA
License number
Massachusetts 41225
Issued Date
Jun 24, 1999
Expiration Date
Jun 30, 2018
Type
Electrical Engineer
Address
Address
Pittsfield, MA 01201
Personal information
See more information about KEITH E CROUCH at radaris.comName
Address
Phone
78 Somerset Ave, Pittsfield, MA 01201
14 Remington St, Cambridge, MA 02138
78 Somerset Ave, Pittsfield, MA 01201
14 Remington St, Cambridge, MA 02138
Professional information
Combination Field Chopper And Battery Charger
US Patent:
4292578, Sep 29, 1981
Filed:
Aug 13, 1979
Appl. No.:
6/065772
Inventors:
Robert L. Steigerwald - Scotia NY
Keith E. Crouch - Pittsfield MA
James W. A. Wilson - Scotia NY
Keith E. Crouch - Pittsfield MA
James W. A. Wilson - Scotia NY
Assignee:
The United States of America as represented by the United States
Department of Energy - Washingon DC
Department of Energy - Washingon DC
International Classification:
H02J 706, H02J 734
US Classification:
320 9
Abstract:
A power transistor used in a chopper circuit to control field excitation of a vehicle motor when in a power mode is also used to control charging current from an a-c to d-c rectifier to the vehicle battery when in a battery charging mode. Two isolating diodes and a small high frequency filter inductor are the only elements required in the chopper circuit to reconfigure the circuit for power or charging modes of operation.