CURRENT SAMPLING SYSTEM AND METHOD FOR MAGNETIC DEVICE, MAGNETIC DEVICE, AND POWER CONVERTER

摘要

Disclosed are a current sampling system and method for a magnetic device, the magnetic device, and a power converter. The current sampling system comprises the magnetic device and a current detection circuit. The magnetic device is an inductor or a transformer, and the inductor or the transformer comprises at least one winding; the winding at least comprises the following two portions: a first portion and a second portion; a first end of the first portion is connected to a first end of the second portion, a second end of the first portion is separated from a second end of the second portion, and the second end of the second portion is connected to the current detection circuit. The current detection circuit is used for sampling a current flowing through the second portion, and obtaining the total current of the winding according to the sampled current flowing through the second portion and a preset ratio; the total current of the winding is the sum of the current flowing through the first portion and the current flowing through the second portion. The total current of the winding is not directly sampled, but the current of a part of the winding is sampled, so that the sampled current is reduced, thus reducing the heat loss generated in the circuit.