Rise time circuit for silicon controlled rectifier

Claim 1

IN A NETWORK OF THE CHARACTER DESCRIBED, A FIRST PAIR OF INPUT TERMINALS, A PAIR OF OUTPUT TERMINALS, A PAIR OF SWITCHING DEVICES, EACH SAID DEVICE HAVING A POWER CIRCUIT AND A CONTROL CIRCUIT ACTUABLE TO INITIATE FLOW OF CURRENT IN SAID POWER CIRCUIT, A FIRST CURRENT PATH INTERCONNECTING SAID PAIRS OF TERMINALS AND INCLUDING SAID POWER CIRCUIT OF A FIRST OF SAID DEVICES, A SECOND CURRENT PATH INTERCONNECTING SAID PAIRS OF TERMINALS AND INCLUDING SAID POWER CIRCUIT OF A SECOND OF SAID DEVICES, A TRANSFORMER HAVING PRIMARY AND SECONDARY WINDING MEANS AND FIRST AND SECOND TERTIARY WINDINGS AND A CORE WHICH IS PROPORTIONED TO SATURATE WITHIN THE NORMAL ENERGIZATION OF SAID PRIMARY WINDING MEANS, A SECOND PAIR OF INPUT TERMINALS, FIRST AND SECOND VALVES, EACH SAID VALVE HAVING A POWER CIRCUIT AND A CONTROL CIRCUIT, A THIRD CURRENT PATH CONNECTING SAID SECOND PAIR OF INPUT TERMINALS TO SAID PRIMARY WINDING MEANS AND INCLUDING SAID POWER CIRCUIT OF SAID FIRST VALVE, A FOURTH CURRENT PATH CONNECTING SAID SECOND PAIR OF INPUT TERMINALS TO SAID PRIMARY WINDING MEANS AND INCLUDING SAID POWER CIRCUIT OF SAID SECOND VALVE, SAID THIRD AND FOURTH PATHS BEING POLARIZED RELATIVE TO SAID PRIMARY WINDING MEANS SUCH THAT CONDUCTION OF SAID THIRD PATH CAUSES FLUX TO INCREASE IN A FIRST DIRECTION AND CONDUCTION OF SAID FOURTH PATH CAUSES FLUX TO INCREASE IN A SECOND DIRECTION, FIFTH CIRCUIT MEANS CONNECTING SAID FIRST TERTIARY WINDING TO SAID CONTROL CIRCUIT OF SAID FIRST VALVE AND POLARIZED SUCH THAT AN INCREASE IN SAID FLUX IN SAID FIRST DIRECTION CAUSES SAID POWER CIRCUIT OF SAID FIRST VALVE TO BE CONDUCTIVE, SIXTH CIRCUIT MEANS CONNECTING SAID SECOND TERTIARY WINDING TO SAID CONTROL CIRCUIT OF SAID SECOND VALVE AND POLARIZED SUCH THAT AN INCREASE IN SAID FLUX IN SAID SECOND DIRECTION CAUSES SAID POWER CIRCUIT OF SAID SECOND VALVE TO BE CONDUCTIVE, A SECOND TRANSFORMER HAVING A PRIMARY WINDING AND A SECONDARY WINDING, SAID SECONDARY WINDING HAVING END TERMINALS AND AN INTERMEDIATE TERMINAL, FIRST AND SECOND ASYMMETRIC CURRENT CONDUCTING DEVICES HAVING A LOWER IMPEDANCE TO CURRENT FLOW IN A FORWARD DIRECTION AND A HIGHER IMPEDANCE TO CURRENT FLOW IN A REARWARD DIRECTION, CIRCUIT MEANS CONNECTING SAID FIRST TERTIARY WINDING BETWEEN ONE OF SAID END TERMINALS AND SAID INTERMEDIATE TERMINAL AND INCLUDING SAID FIRST ASYMMETRIC DEVICE, SAID FIRST ASYMMETRIC DEVICE BEING ARRANGED SUCH THAT ITS SAID FORWARD CURRENT FLOWS THROUGH SAID FIRST TERTIARY WINDING IN A DIRECTION TO INDUCE SAID FLUX IN SAID CORE IN SAID SECOND DIRECTION, AND CIRCUIT MEANS CONNECTING SAID SECOND TERTIARY WINDING BETWEEN THE OTHER OF SAID END TERMINALS AND SAID INTERMEDIATE TERMINAL AND INCLUDING SAID SECOND ASYMMETRIC DEVICE, SAID SECOND ASYMMETRIC DEVICE BEING ARRANGED SUCH THAT ITS SAID FORWARD CURRENT FLOWS THROUGH SAID SECOND TERTIARY WINDING IN A DIRECTION TO INDUCE FLUX IN SAID CORE IN SAID FIRST DIRECTION, AND A SOURCE OF PULSATING POTENTIAL CONNECTION TO SAID PRIMARY WINDING.