AUSTENITISKT ROSTFRITT STAL OCH ANVENDNING AV DETTA

摘要

A modular supply for converting three-phase alternating current to direct current for high power applications. A plurality of individual rectifying modules are connected in parallel and fed by a common three-phase SCR controller. The rectified DC output of each of the individual modules are collected in parallel at common output busses. A self-adjusting voltage-current regulator is coupled to the output busses to sample the output current and voltage to control the power passed by the SCR controller. The voltage feedback and current feedback are applied to a "nor" gate which places the SCR controller under the control of the voltage feedback so long as the current does not exceed acceptable limits as determined by the number of modules active in the power supply and/or exceed a current limit that is set by the operator for the power supply. In the voltage control mode, the output voltage is maintained substantially constant. The "nor" gate transfers control of the controller to a current limiting mode which maintains the current within acceptable limits while permitting the voltage to drop off. Each of the modules has an input circuit breaker associated therewith which in turn is arranged to vary the level of the current feedback depending on the number of active modules in the power supply.