STORAGE TIME CONTROL

摘要

We describe a method of controlling turn off time delay of a switching device of a switch mode power converter (SMPC). The SMPC has an inductive component comprising an input winding coupled to receive power from an input; and a switching device to, when on, conduct input winding current. In embodiments the method comprises applying turn on and turn-off signals to the switching device; applying at least one turn off signal, to initiate turning off of the switching device, and detecting a sensing signal from a further winding of the inductive component, inductively coupled to the input winding, to thereby indicate an end of a turn off time delay or duration. The method controls the turn on signal for a subsequent switching cycle of the SMPC device to regulate the turn off delay time.

主权项

1. A method of controlling turn off time delay of a switching device of a switch mode power converter (SMPC), the SMPC comprising:
an inductive component comprising an input winding coupled to receive power from an input to said SMPC; and a switching device configured to, when on, conduct current of said input winding; the method comprising: applying at least one turn on signal to cause conduction of the switching device; applying at least one turn off signal, to initiate turning off of the switching device, said turning off having a duration comprising a turn off time delay of the switching device; detecting a sensing signal from a further winding of the inductive component, to thereby indicate an end of said turn off time delay, wherein the further winding is inductively coupled to the input winding; and controlling the turn on signal for a subsequent conduction of the switching device to regulate a subsequent turn off delay time.