Sine wave-square wave converter

Claim 1

APPARATUS FOR APPLYING CURRENT FROM A POWER SUPPLY IN ONE DIRECTION, AND, ALTERNATELY, IN AN OPPOSITE DIRECTION THROUGH A LOAD IN SYNCHRONISM WITH THE POSITIVE AND NEGATIVE PORTIONS, RESPECTIVELY, OF A SINE WAVE CONTROL SIGNAL, COMPRISING: CLIPPING MEANS HAVING AN INPUT CONNECTED TO RECEIVE THE SINE WAVE CONTROL SIGNAL AND PRODUCE A CLIPPED VERSION OF THE CONTROL SIGNAL AT THE OUTPUT THEREOF; SIGNAL INVERTER MEANS HAVING ITS INPUT CONNECTED TO THE OUTPUT OF THE CLIPPING MEANS AND HAVING FIRST AND SECOND OUTPUTS, SAID INVERTER MEANS BEING RESPONSIVE TO THE OUTPUT OF THE CLIPPING MEANS FOR PROVIDING AN OUTPUT SIGNAL AT SAID FIRST OUTPUT IN PHASE WITH THE CONTROL SIGNAL AND AN OUTPUT SIGNAL AT SAID SECOND OUTPUT 180* OUT OF PHASE WITH THE CONTROL SIGNAL; FIRST AND SECOND SCHMITT TRIGGER MEANS, EACH OF SAID TRIGGER MEANS HAVING AN INPUT AND AN OUTPUT; MEANS CONNECTING THE INPUT OF THE FIRST TRIGGER MEANS TO THE FIRST OUTPUT OF THE INVERTER MEANS FOR PRODUCING SQUARE WAVE PULSES AT THE OUTPUT OF THE RESECTIVE TRIGGER MEANS SYNCHRONIZED WITH THE POSITIVE PORTIONS OF THE CONTROL SIGNAL; MEANS CONNECTING THE INPUT OF THE SECOND TRIGGER MEANS TO THE SECOND OUTPUT OF THE INVERTER MEANS FOR PRODUCING SQUARE WAVE PULSES AT THE OUTPUT OF THE RESPECTIVE TRIGGER MEANS SYNCHRONIZED WITH THE NEGATIVE PORTIONS OF THE CONTROL SIGNAL; A TRANSISTOR BRIDGE CIRCUIT CONNECTING THE POWER SUPPLY TO THE LOAD AND HAVING TWO INPUTS, SAID BRIDGE CIRCUIT BEING RESPONSIVE TO A PULSE TYPE SIGNAL APPLIED TO ONE OF THE INPUTS THEREOF FOR DIRECTING CURRENT FROM THE POWER SUPPLY THROUGH THE LOAD IN ONE DIRECTION AND BEING RESPONSIVE TO A PULSE TYPE SIGNAL APPLIED TO THE OTHER INPUT THEREOF FOR DIRECTING CURRENT FROM THE POWER SUPPLY THROUGH THE LOAD IN THE OPPOSITE DIRECTION; MEANS INCLUDING DIRECT CURRENT RESTORING MEANS CONNECTING THE OUTPUT OF THE FIRST TRIGGER MEANS TO ONE INPUT OF THE TRANSISTOR BRIDGE CIRCUIT; AND MEANS INCLUDING DIRECT CURRENT RESTORING MEANS CONNECTING THE OUTPUT OF THE SECOND TRIGGER MEANS TO THE OTHER INPUT OF THE TRANSISTOR BRIDGE CIRCUIT, WHEREBY CURRENT FROM THE POWER SUPPLY IS DIRECTED THROUGH THE LOAD IN ONE DIRECTION IN SYNCHRONISM WITH THE POSITIVE PORTIONS OF THE CONTROL SIGNAL AND THROUGH THE LOAD IN THE OPPOSITE DIRECTION IN SYNCHRONISM WITH THE NEGATIVE PORTIONS OF THE CONTROL SIGNAL.