| 摘要 |
<p>A solid state control circuit (30) is connected to the output of an engine (14) or motor driven alternator (12) to provide a direct current output primarily for welding purposes. The control circuit (30) includes gate controlled thyristors (SCRs) (25) 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 (Fig. 3) associated with the alternator provide signals (36) used to control the time of gating for the SCRs. Circuit means (60, 70, 75) are included to insure that the control signals will be unaffected by any disturbances generated within the synchronizing signals due to the operation of the SCRs, and one such means includes an amplifier (U-7) having a feedback circuit (R48) providing a hysteresis greater than any voltage change in the synchronizing signal caused by the operation of the SCRs. </p> |
