Power supply circuit

Claim 1

A POWER SUPPLY CIRCUIT COMPRISING (A) AN INVERTER CIRCUIT INCLUDING AN ELECTRICAL AMPLIFYING DEVICE HAVING TWO MAIN ELECTRODES AND A CONTROL ELECTRODE, (B) A TRANSFORMER HAVING A PRIMARY WINDING AND A FIRST AND A SECOND SECONDARY WINDING, (C) A SWITCH HAVING AN OPERATING COIL AND THREE CONTACTS, (D) ONE OF SAID CONTACTS BEING CONNECTED TO SAID CONTROL ELECTRODE, A SECOND OF SAID CONTACTS BEING CONNECTED TO ONE OF SAID MAIN ELECTRODES, AND A THIRD OF SAID CONTACTS BEING CONNECTED TO SAID ONE MAIN ELECTRODE THROUGH SAID FIRST SECONDARY COIL, (E) SAID SWITCH INCLUDING MEANS FOR NORMALLY CONNECTING SAID ONE AND SAID THIRD CONTACT, (F) A FIRST PAIR OF TERMINALS FOR CONNECTION TO A DIRECT CURRENT SOURCE AND A SECOND PAIR OF TERMINALS FOR CONNECTED TO AN ALTERNATING CURRENT SOURCE, (G) A CONNECTION FROM ONE OF SAID SECOND PAIR OF TERMINALS THROUGH SAID OPERATING COIL AND THROUGH SAID PRIMARY WINDING IN TANDEM TO THE OTHER OF SAID SECOND PAIR OF TERMINALS, (H) MEANS FOR CONNECTING A LOAD ACROS SAID PRIMARY WINDING, AND (I) MEANS FOR COMPLETING A CONNECTION BETWEEN SAID FIRST PAIR OF TERMINAL OVER A PATH INCLUDING SAID MAIN ELECTRODES AND AT LEAST A PORTION OF SAID SECOND SECONDARY WINDING IN TENDEM, WHEREBY SAID COIL IS OPERATED ONLY UPON CURRENT FLOWING THROUGH SAID OPERATING COIL FROM SAID ALTRNATING CURRENT SOURCE TO DISCONNECT ONE CONTACT FROM SAID THIRD CONTACT OF SAID SWITCH AND TO CONNECT SAID FIRST CONTACT TO SAID SECOND CONTACT OF SAID SWICH.