Apparatus of coupled inductors with balanced electromotive forces
First Claim
1. An apparatus of coupled inductors, comprising:
- a material body having a first wrapping region and a second wrapping region along an axis direction;
a first electrode, a second electrode, third electrode and a fourth electrode on a first terminal location and a second terminal location 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 first electrode and a second end extending towards the second wrapping region; and
a second winding leg having a first end connected to the first winding leg and a second end connected to the second electrode;
a second coil wrapped in the second wrapping region comprising;
a third winding leg having a first end connected to the third electrode and a second end extending towards the first wrapping region; and
a fourth winding leg having a first end connected to the third winding leg and a second end connected 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;
the second wrapping region is between the second terminal location and the first wrapping region;
the first coil is not wrapped in the second wrapping region; and
the second coil is not wrapped in the first wrapping region.
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Abstract
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.
11 Citations
15 Claims
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1. An apparatus of coupled inductors, comprising:
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a material body having a first wrapping region and a second wrapping region along an axis direction; a first electrode, a second electrode, third electrode and a fourth electrode on a first terminal location and a second terminal location 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 first electrode and a second end extending towards the second wrapping region; and a second winding leg having a first end connected to the first winding leg and a second end connected to the second electrode; a second coil wrapped in the second wrapping region comprising; a third winding leg having a first end connected to the third electrode and a second end extending towards the first wrapping region; and a fourth winding leg having a first end connected to the third winding leg and a second end connected 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; the second wrapping region is between the second terminal location and the first wrapping region; the first coil is not wrapped in the second wrapping region; and the second coil is not wrapped in the first wrapping region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification