Filter inductor and vehicle-mounted charger

Abstract

The invention provides a filter inductor and a vehicle-mounted charger. The filter inductor comprises an outer magnetic core with a window, an inner magnetic core and a winding, the inner magnetic core comprises a first inner magnetic core and a second inner magnetic core which are at least partially positioned in the window; the windings comprise a first winding, a second winding, a third windingand a fourth winding which are wound on the outer magnetic core at intervals; the first inner magnetic core and the second inner magnetic core are stacked; the first end of the first inner magnetic core is located between the first winding and the second winding, the second end of the first inner magnetic core is located between the third winding and the fourth winding, the first end of the second inner magnetic core is located between the second winding and the third winding, and the second end of the second inner magnetic core is located between the fourth winding and the first winding. According to the filter inductor, the magnetic bias problem caused by current imbalance can be effectively reduced, and the EMI signal suppression capability of the filter inductor is improved.

Description

technical field [0001] The present application relates to the technical field of power electronics, in particular to a filter inductor and a vehicle charger. Background technique [0002] With the development of power electronics technology, especially the development of new energy electric vehicle technology, on-board chargers are constantly developing in the direction of higher power and shorter charging time. Common on-board chargers usually include an EMI (Electromagnetic Interference, "electromagnetic interference", I will not repeat the above) filter circuit. The differential and common-mode filter inductors in the EMI filter circuit can use differential and common-mode integrated magnetic core structures to simultaneously Provides differential, common-mode impedance, reducing the size and weight of the filter inductor. However, in the on-board charger with high-power three-phase power supply, when the current of the three-phase winding is unbalanced, the existing fil...

AI Technical Summary

Problems solved by technology

[0003] This application provides a filter inductor and a vehicle charger, aiming to solve the problem that the ability of the filter inductor to suppress EMI signals decreases or even fails when the current flowing into each winding is unbalanced in the filter inductor in the prior art

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