Scr control circuit gated by unijunction transistor relaxation oscillator with capacitive linearization

Claim 1

A CONTROL CURCUIT FOR USE IN ENERGIZING A LOAD FROM A SOURCE OF A.C. VOLTAGE, COMPRISING; A CONTROLLED RECTIFIER HAVING INPUT ELECTRODES AND HAVING OUTPUT ELECTRODES ADAPTED TO BE CONNECTED IN SERIES CIRCUIT THROUGH THE LOAD TO THE SOURCE OF A.C. VOLTAGE, A UNIJUNCTION TRANSISTOR HAVING INPUT ELECTRODES AND OUTPUT ELECTRODES. CIRCUIT MEANS CONNECTING THE OUTPUT ELECTRODES OF SAID TRANSISTOR IN CONTROLLING RELATION TO THE INPUT ELECTRODES OF SAID RECTIFIER TO FIRE SAID RECTIFIER UPON FIRING OF SAID TRANSISTOR, AND CONNECTING THE OUTPUT ELECTRODES OF SAID TRANSISTOR IN PARALLEL WITH THE OUTPUT ELECTRODES OF SAID RECTIFIER, A FIRST CAPACITOR CONNECTED TO THE INPUT ELECTRODES OF SAID TRANSISTOR, VARIABLE RESISTANCE MEANS CONNECTED IN PARALLEL WITH THE OUTPUT ELECTRODES OF SAID RECTIFIER AND CONNECTED TO SAID FIRST CAPACITOR TO CHARGE THE SAME DURING TIME PERIODS IN WHICH SAID RECTIFIER IS NONCONDUCTIVE AND AT A RATE DETERMINED BY THE MAGNITUDE OF SAID RESISTANCE MEANS, THE CHARGE ON SAID FIRST CAPACITOR TENDING TO FIRE SAID TRANSISTOR, AND SAID FIRST CAPACITOR BEING DISCHARGED UPON FIRING OF SAID TRANSISTOR, AND A FURTHER CAPACITOR CONNECTED TO SAID RESISTANCE MEANS AND TO THE INPUT ELECTRODES OF SAID TRANSISTOR TO BE CHARGED DURING PERIODS IN WHICH SAID RECTIFIER IS NONCONDUCTIVE, TO NOT FULLY DISCHARGE UPON FIRING OF SAID TRANSISTOR, AND TO APPLY A VOLTAGE TO THE INPUT ELECTRODES OF SAID TRANSISTOR IN A MANNER TENDING TO FIRE SAID TRANSISTOR.