Pulse width modulator

Claim 1

A PULSE WIDTH MODULATOR COMPRISING, IN COMBINATION, A SATURABLE MAGNETIC CORE MEMBER HAVING A PRESELECTED SUBSTANTIALLY RECTANGULAR B-H CHARACTERISTIC CURVE AND HAVING FIRST, SECOND, THIRD AND FOURTH WINDINGS THEREON, ALL SAID WINDINGS BEING WOUND IN PREDETERMINED DIRECTIONS AND HAVING PRESELECTED NUMBERS OF TURNS, MEANS OPERATIVELY CONNECTED TO SAID FIRST WINDING FOR APPLYING A FIRST DIRECT CURRENT VOLTAGE OF PREDETERMINED AMPLITUDE TO THE FIRST WINDING FOR A PREDETERMINED PERIOD OF TIME AND THEN ABRUPTLY STOPPING THE APPLICATION OF SAID FIRST VOLTAGE, SAID FIRST VOLTAGE WHILE APPLIED TO THE FIRST WINDING CHANGING THE FLUX IN SAID CORE MEMBER IN A MANNER WHICH TENDS TO CHANGE THE CORE MEMBER TOWARD SATURATION IN A FIRST DIRECTION ON SAID B-H CHARACTERISTIC CURVE, SAID FIRST VOLTAGE STOPPING BEFORE THE CORE MEMBER REACHES SATURATION IN SAID FIRST DIRECTION, THE STOPPING OF SAID FIRST VOLTAGE CAUSING A FURTHER CHANGE IN THE FLUX IN SAID CORE MEMBER, SAID FURTHER FLUX CHANGE CAUSING AN INDUCED VOLTAGE IN SAID SECOND WINDING, A SOURCE OF A SECOND DIRECT CURRENT VOLTAGE, CIRCUIT MEANS OPERATIVELY CONNECTING SAID SECOND DIRECT CURRENT VOLTAGE SOURCE TO SAID THIRD WINDING, SAID CIRCUIT MEANS INCLUDING A TRANSISTOR OPERATIVELY CONNECTED TO THE SECOND WINDING AND HAVING THE CONDUCTIVITY THEREOF UNDER THE CONTROL OF THE INDUCED VOLTAGE IN THE SECOND WINDING FOR WHILE CONDUCTIVE CAUSING THE APPLICATION OF THE SECOND DIRECT CURRENT VOLTAGE TO THE THIRD WINDING, SAID SECOND DIRECT CURRENT VOLTAGE WHILE APPLIED TO SAID THIRD WINDING CAUSING A STILL FURTHER CHANGE IN THE FLUX IN SAID CORE MEMBER IN A MANNER WHICH CAUSES THE CORE MEMBER TO BECOME SATURATED IN A SECOND DIRECTION ON SAID B-H CHARACTERISTIC CURVE OPPOSITE TO SAID FIRST DIRECTION AND INDUCES A VOLTAGE IN SAID SECOND WINDING WHICH CAUSES SAID TRANSISTOR TO STOP THE APPLICATION OF THE SECOND VOLTAGE TO THE THIRD WINDING, ALL THE FLUX CHANGES IN SAID CORE MEMBER CAUSING INDUCED VOLTAGES IN SAID FOURTH WINDING, AND OUTPUT CIRCUIT MEANS CONNECTED TO THE FOURTH WINDING AND INCLUDING RECTIFIER MEANS FOR LIMITING THE OUTPUT TO PULSES OF A SINGLE SELECTED POLARITY.