Three level converter

Claim 1

A TERNARY SWITCHING CIRCUIT FOR CYCLING AN INPUT SIGNAL CAPABLE OF EXISTING AT A FIRST, AN INTERMEDIATE, OR A SECOND SIGNAL LEVEL COMPRISING: A FIRST AND A SECOND POTENTIAL SOURCE, SAID FIRST SOURCE CORRESPONDING TO SAID FIRST LEVEL AND SAID SECOND SOURCE CORRESPONDING TO SAID SECOND LEVEL; AN OUTPUT CIRCUIT; TWO SWITCHING MEANS, ONE OF SAID SWITCHING MEANS BEING CONNECTED BETWEEN SAID FIRST SOURCE AND SAID OUTPUT CIRCUIT AND THE OTHER OF SAID SWITCHING MEANS BEING CONNECTED BETWEEN SAID FIRST SOURCE AND A POINT COMMON TO BOTH SAID SECOND SOURCE AND SAID OUTPUT CIRCUIT; SAID OUTPUT CIRCUIT INCLUDING MEANS CONNECTED TO SAID SWITCHING MEANS FOR PROVIDING AN OUTPUT SIGNAL CORRESPONDING TO SAID FIRST, INTERMEDIATE, AND SECOND LEVELS IN RESPONSE TO SELECTIVE COUPLING OF SAID POTENTIAL SOURCES TO SAID OUTPUT CIRCUIT; A CONTROL CIRCUIT CONNECTED TO SAID SWITCHING MEANS, SAID CONTROL CIRCUIT BEING CONTROLLED BY SAID INTERMEDIATE LEVEL SIGNAL APPLIED THERETO FOR PROVIDING A FIRST ONE OF SAID CONTROL SIGNALS TO SAID SWITCHING MEANS THEREBY ESTABLISHING A COUPLING CONNECTION BETWEEN SAID SECOND SOURCE AND SAID OUTPUT CIRCUIT, SAID CONTROL CIRCUIT BEING FURTHER CONTROLLED BY SAID SECOND LEVEL SIGNAL APPLIED THERETO FOR PROVIDING A SECOND ONE OF SAID CONTROL SIGNALS TO SAID SWITCHING MEANS THEREBY ESTABLISHING A COUPLING CONNECTION BETWEEN SAID FIRST SOURCE AND SAID OUTPUT CIRCUIT, SAID CONTROL CIRCUIT BEING ADDITIONALLY CONTROLLED BY SAID FIRST LEVEL SIGNAL APPLIED THERETO FOR PROVIDING A THIRD ONE OF SAID CONTROL SIGNALS TO SAID SWITCHING MEANS THEREBY SELECTIVELY ESTABLISHING A COUPLING CONNECTION BETWEEN SAID SOURCES AND SAID OUTPUT CIRCUIT FOR PROVIDING AN OUTPUT SIGNAL CORRESPONDING TO SAID INTERMEDIATE LEVEL.