TUNED SWITCH-MODE POWER SUPPLY WITH CURRENT MODE CONTROL

摘要

IN A TUNED SWITCH MODE POWER SUPPLY A ZERO VOLTAGE IS MAINTAINED ACROSS A TRANSISTOR SWITCH (Q3), DURING BOTH TURN OFF AND TURN ON SWITCHING TRANSITION INTERVALS IN THE TRANSISTOR SWITCH. THE TUNED SWITCH MODE POWER SUPPLY OPERATES IN A CURRENT -MODE CONTROL, ON A CURRENT PULSE-BY-CURRENT PULSE CONTROL BASIS. A MODULATOR (31) OF THE POWER SUPPLY INCLUDES A PAIR OF TANSISTORS (Q1, Q2) THAT FORM A REGENERATIVE SWITCH TO PRODUCE A PORTION OF A CONTROL SIGNAL (VG) OF THE TRANSISTOR SWITCH THAT CAUSES THE TRANSISTOR SWITCH TO TURN OFF. A TRANSFORMER-COUPLED INPUT SUPPLY VOLTAGE (VI) MAINTAINS THE TRANSISTOR SWITCH CONDUCTIVE AS LONG AS THE CURRENT IN THE TRANSISTOR SWITCH DOES NOT EXCEED THE THRESHOLD LEVEL OF A REGENERATIVE SWITCH. A RESONANT PULSE (VD) IS TRANSFORMER-COUPLED FROM THE RESONANT CIRCUIT TO THE REGENERATIVE SWITCH FOR TURNING OFF THE REGENERATIVE SWITCH AND FOR MAINTAINING THE TRANSISTOR SWITCH NON CONDUCTIVE AFTER THE REGENERATIVE SWITCH IS TURNED OFF.