Method and a circuit arrangement for determining a demagnetization zero current time

摘要

In various embodiments a method for determining a demagnetization zero current time, at which a transformer is substantially demagnetized, for a switched mode power supply comprising a transformer is provided, wherein the method may include: applying a first current through a winding of one side of the transformer; interrupting the current flow of the first current; measuring a time at which a voltage across a winding of another side of the transformer becomes substantially zero; and determining the demagnetization zero current time using the measured time.

主权项

1. A method for determining a demagnetization zero current time period, during which a transformer is substantially demagnetized, for a switched mode power supply, comprising a transformer having a first side and a second side, the method comprising:
applying a first current through a winding of the first side of the transformer; interrupting the current flow of the first current; measuring a time period triggered by the interruption of the current flow of the first current and finishing at a time at which a voltage across a winding of the second side of the transformer becomes substantially zero; determining the demagnetization zero current time period using the measured time period.