Self-Adjusting Current Injection Technology

A method comprising:

• providing a DC-DC converter comprising:
• a main switch;
• a transformer having a primary winding and a current injection winding, wherein a leakage inductance is formed between the primary winding and the current injection winding;
• an input voltage source;
• a primary switch connected to the primary winding;
• a parasitic capacitance reflected across the primary switch;
• a secondary rectifier means connected to the primary winding;
• a current injection circuit comprising:
• a current injection switch connected to a first terminal of the current injection winding;
• and
• a unidirectional current injection switch connected to a second terminal of the current injection winding, wherein the second terminal is not connected to the current injection switch;
• and
• a controlled voltage source connected to the unidirectional current injection switch and to the current injection switch at an end of the current injection switch which is not connected to the current injection winding;
• switching on the current injection switch so as to start a current injection flowing from the controlled voltage source, through the unidirectional current injection switch and further through the current injection winding, wherein the current injection reflects into the primary winding with an amplitude proportional to a turn ratio of the current injection winding to the primary winding;
• the current injection reflected into the primary winding discharging the parasitic capacitance reflected across the primary switch;
• turning on the primary switch with a delay time after the current injection switch turns on;
• and
• turning off the current injection switch after the current injection reaches zero amplitude.