Heat control circuit generating pulses synchronized to a. c. source employing two pnpn diodes having different threshold values

Claim 1

A CIRCUIT FOR GENERATING PULSES IN TIMED RELATIONSHIP WITH AN A.C. SIGNAL HAVING A VOLTAGE OF A GIVEN MAGNITUDE, WHICH COMPRISES: A FIRST CAPACITOR; A FIRST RESISTOR; A FIRST PNPN DIODE, HAVING A BREAKOVER VOLTAGE IN EXCESS OF SAID GIVEN MAGNITUDE, COUPLED TO SAID FIRST CAPACITOR AND SAID FIRST RESISTOR IN A CLOSED LOOP; A SECOND CAPACITOR; A SECOND RESISTOR; A SECOND PNPN DIODE, HAVING A BREAKOVER VOLTAGE LOWER THAN SAID GIVEN MAGNITUDE, COUPLED TO SAID SECOND CAPACITORY AND SAID SECOND RESISTOR IN A CLOSED LOOP; A RECTIFIER; MEANS FOR APPLYING SAID A.C. SIGNAL TO SAID RECTIFIER; MEANS FOR APPLYING THE OUTPUT OF SAID RECTIFIER TO SAID FIRST CAPACITOR TO CHARGE SAID FIRST CAPACITOR WITH A VOLTAGE OF SAID GIVEN MAGNITUDE; MEANS, INCLUDING A VARIABLE RESISTOR AND SAID FIRST CAPACITOR, FOR CHARGING SAID SECOND CAPACITOR TO SAID SECOND PNPN DIODE BREAKOVER VOLTAGE, WHEREBY SAID SECOND PNPN DIODE ASSUMES ITS LOW IMPEDANCE STATE, SAID SECOND CAPACITOR DISCHARGE THROUGH SAID SECOND RESISTOR GENERATING A FIRST PULSE IN TIMED RELATIONSHIP WITH SAID A.C. SIGNAL AND OF SAID GIVEN MAGNITUDE, WHEN ADDED TO SAID VOLTAGE OF SAID GIVEN MAGNITUDE, TO CAUSE SAID FIRST PNPN DIODE TO ASSUME ITS LOW IMPEDANCE STATE; AND MEANS FOR APPLYING SAID FIRST PULSE TO SAID FIRST PNPN DIODE, CAUSING SAID FIRST PNPN DIODE TO ASSUME ITS LOW IMPEDANCE STATE, DISCHARGING SAID FIRST CAPACITOR THROUGH SAID FIRST RESISTOR, AND GENERATING A SECOND PULSE IN TIMED RELATIONSHIP WITH SAID A.C. SIGNAL; WHEREIN THE SETTING OF SAID VARIABLE RESITOR DETERMINES THE CHARGING RATE OF SECOND CAPACITOR AND, HENCE, THE TIMED RELATIONSHIP BETWEEN SAID A.C. SIGNAL AND SAID FIRST AND SECOND PULSES.