Voltage sensitive control circuit

Claim 1

IN A POWER SUPPLY ADAPTED TO OPERATE FROM UNDIRECTIONAL SUPPLY VOLTAGES OF DIFFERENT MAGNITUDES, WHICH INCLUDES PROTECTIVE CIRCUITRY TO AVOID DAMAGE TO COMPONENTS OF THE POWER SUPPLY FROM OVER VOLTAGES, THE COMBINATION OF A HIGH VOLTAGE SOLID STATE STATIC D.C. TO A.C. INVERTER, A LOW VOLTAGE SOLID STATE STATIC D.C. TO A.C. INVERTER, INPUT TERMINALS ADAPTED TO HAVE UNDIRECTIONAL VOLTAGES OF DIFFERENT MAGNITUDES IMPRESSED THEREON, CONTROL MEANS FOR INSURING THAT THE SAID HIGH VOLTAGE STATIC INVERTER IS COUPLED TO SAID INPUT TERMINALS WHENEVER SUPPLY VOLTAGES ARE FIRST IMPRESSED ON SAID INPUT TERMINALS AND FOR SELECTIVELY CONNECTING SAID LOW VOLTAGE AND HIGH VOLTAGE INVERTERS TO SAID TERMINALS IN RESPONSE TO THE MANITUDES OF THE SUPPLY VOLTAGE INCLUDING: (A) SWITCHING MEANS COUPLED TO SAID INPUT TERMINALS AND RESPONSIVE TO THE SUPPLY VOLTAGE FOR SELECTIVELY COUPLING THE HIGH AND LOW VOLTAGE INVERTERS TO SAID INPUT TERMINALS, SAID SWITCHING MEANS WHEN IN THE DE-ENERGIZED STATE ALWAYS COUPLING SAID HIGH VOLTAGE INVERTER TO SAID TERMINALS SO THAT UPON ENERGIZATION OF THE POWER SUPPLY THE LOW VOLTAGE INVERTER IS PROTECTED AGAINST DAMAGE FROM INADVERTENT APPLICATION OF HIGH VOLTAGES; AND (B) VOLTAGE SENSING MEANS RESPONSIVE TO THE VOLTAGE LEVEL AT SAID INPUT TERMINALS FOR ENERGIZING SAID SWITCHING MEANS WHENEVER THE SUPPLY VOLTAGE IS BELOW A PREDETERMINED MAGNITUDE TO REMOVE SAID HIGH VOLTAGE INVERTER FROM SAID TERMINALS AND COUPLE SAID LOW LEVEL INVERTER THERETO.