Starter protector for d. c. -a. c. inverter

Claim 1

A TRANSISTOR OSCILLATOR HAVING AN OUTPUT CIRCUIT AND AN INPUT CIRCUIT COUPLED TO GENERATE SELF-SUSTAINED OSCILLATIONS, A DIRECT CURRENT SOURCE CONNECTED IN SAID OUTPUT CIRCUIT, STARTER CIRCUIT MEANS TO MOMENTARILY BIAS THE CONTROL ELECTRODE OF THE TRANSISTOR TO CAUSE CONDUCTION AND INITIATION OF OSCILLATION WHEN THE DIRECT CURRENT POWER OF SAID SOURCE IS APPLIED TO THE TRANSISTOR, SAID MEANS INCLUDING A ZENER DIODE AND A STORAGE CONDENSER CONNECTED IN SERIES ACROSS THE INPUT CIRCUIT OF SAID TRANSISTOR, THE ZENER BREAKDOWN VOLTAGE OF SAID ZENER DIODE BEING LESS THAN SAID DIRECT CURRENT VOLTAGE OF SAID SOURCE TO DISCHARGE THE CHARGE OF SAID CONDENSER INTO SAID INPUT CIRCUIT WHEN THE ZENER BREAKDOWN VOLTAGE IS EXCEEDED, MEANS FOR DECOUPLING SAID STARTER CIRCUIT MEANS AFTER OSCILLATION STARTS WHEN THE CONTROL ELECTRODE BIAS VOLTAGE DROPS, SAID MEANS FOR DECOUPLING COMPRISING A SECOND DIODE IN SERIES WITH SAID ZENER DIODE, SAID SECOND DIODE BEING REVERSELY POLARIZED WITH RESPECT TO SAID ZENER DIODE TO PREVENT FORWARD CURRENT THROUGH SAID ZENER DIODE, AND A LEAKAGE RESISTANCE OF HIGH OHMIC VALUE CONNECTED ACROSS SAID STORAGE CONDENSER TO DISCHARGE SAID CONDENSER WHEN OSCILLATIONS CEASE.