H - Electricity – 02 – M
Patent
H - Electricity
02
M
322/33, 321/92
H02M 7/155 (2006.01) B23K 9/10 (2006.01) H02M 1/088 (2006.01) H02P 9/30 (2006.01)
Patent
CA 1159901
BFN 6862 SOLID STATE CONTROL FOR MOTOR-GENERATOR WELDER Abstract of the Disclosure A solid state control circuit is connected to the output of an engine or motor driven alternator to provide a direct current output primarily for welding purposes. The control circuit includes gate controlled thyristors (SCRs) which are gated on at precise times within each cycle in order to provide an output having desired characteristics, such as constant current or constant voltage. Synchronizing windings are provided within the alternator and associated with the alternator power windings for providing synchronizing signals. Since the operation or conduction of SCRs may cause disturbances within the circuit which controls the conduction of those devices, means are connected between the synchroniz- ing windings and the control circuit for providing a source of control signals which are unaffected by the operation of the SCRs. One such means includes an amplifier having a feedback circuit providing a hysteresis greater than any voltage change in the synchronizing signals caused by the operation of the SCRs.
363873
Gowling Lafleur Henderson Llp
Thermal Arc Inc.
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