APPARATUS OF COUPLED INDUCTORS WITH BALANCED ELECTROMOTIVE FORCES

摘要

An apparatus of coupled inductors includes a first coil and a second coil arranged in a way that an inter-coil capacitance between the first coil and the second coil can keep electromotive forces induced by a first inductance of the first coil and a second inductance of the second coil about the same. As the current bypasses an unbalanced parasitic capacitor, a compensation capacitor disposed between the two coils can compensate the inter-coil capacitance of the parasitic capacitor. The apparatus of coupled inductors implemented with a specific coil arrangement or disposed with the compensation capacitor can keep the EMFs induced over the two inductances equal in amplitude, which prevents both the differential-mode and common-mode interference from being converted, improving the characteristics of mode conversion and is suitable to be utilized in a PoE system or the like.

主权项

1. An apparatus of coupled inductors, comprising:
a first electrode and a second electrode disposed on a first terminal location along an axis direction; a third electrode and a fourth electrode disposed on a second terminal location along the axis direction; a first wrapping region and a second wrapping region located along the axis direction; a first coil wrapped in the first wrapping region and comprising:
a first winding leg having a first end connected to the second electrode and a second end extending towards the second wrapping region; anda second winding leg having a first end connected to the first winding leg and a second end extending towards the first terminal location for connecting to the first electrode; and a second coil wrapped in the second wrapping region and comprising:
a third winding leg having a first end connected to the third electrode and a second end extending towards the first wrapping region; anda fourth winding leg having a first end connected to the third winding leg and a second end extending towards the second terminal location for connecting to the fourth electrode; wherein:
the first terminal location and the second terminal location are on opposite sides of the axis direction;the first wrapping region is between the first terminal location and the second wrapping region; andthe second wrapping region is between the second terminal location and the first wrapping region.