Energy transfer element and converter including the same
View Patent ↗An energy transfer element includes a first winding coupled to an input circuit and a second winding coupled to an output circuit. The first winding has a first unit and a second unit, and the second winding is wound between the first unit of the first winding and the second unit of the first winding. The energy transfer element further includes a third winding provided between the first unit of the first winding and the second winding. The third winding is used to supply a bias voltage of the input circuit, and a winding width of the third winding is greater than a winding width of the first unit of the first winding and a width of the second winding.
1. An energy transfer element for transmitting energy of an input circuit to an output circuit, comprising:
a first winding, coupled to the input circuit and wound as a first unit and a second unit;
a second winding, coupled to the output circuit and wound between the first unit of the first winding and the second unit of the first winding; and
a third winding, provided between the first unit of the first winding and the second winding and coupled to a bias voltage supply circuit for supplying a bias voltage used by the input circuit,
wherein a winding width of the third winding is greater than a winding width of the first unit of the first winding and a winding width of the second winding.
2. The energy transfer element of claim 1 , wherein
the third winding is configured to reduce a displacement current, flowing between the first unit of the first winding and the second winding.
3. The energy transfer element of claim 1 , further comprising
a fourth winding, wound between the second unit of the first winding and the second winding.
4. The energy transfer element of claim 3 , wherein
a first end of the fourth winding is coupled to the input circuit, and a second end of the fourth winding is open.
5. The energy transfer element of claim 3 , wherein
a first end of the fourth winding is coupled to a ground of the input circuit, and a second end of the fourth winding is open.
6. The energy transfer element of claim 3 , wherein
a winding width of the fourth winding is greater than the winding width of the second unit of the first winding and the winding width of the second winding.
7. The energy transfer element of claim 1 , further comprising
a conductive shield disposed between the second unit of the first winding and the second winding.
8. The energy transfer element of claim 1 , further comprising:
a bobbin, on which the first to third windings are wound,
wherein the windings are wound on the bobbin in the order of the second unit of the first winding, the second winding, the third winding, and the first unit of the first winding.
9. The energy transfer element of claim 1 , wherein
the third winding has a plurality of windings.
10. The energy transfer element of claim 1 , wherein
one of the two terminals of the third winding is coupled to a ground of the input circuit.
11. The energy transfer element of claim 1 , wherein
the first winding is an input winding of the energy transfer element and the second winding is an output winding of the energy transfer element.
12. The energy transfer element of claim 1 , wherein
the energy transfer element is used for a flyback converter.
13. The energy transfer element of claim 1 , wherein
the energy transfer element is used for a forward converter.
14. A converter, comprising:
an input circuit, configured to supply energy;
an output circuit, configured to output a predetermined energy corresponding to the energy supplied by the input circuit;
an energy transfer element, coupled between the input circuit and the output circuit, for transmitting energy of the input circuit to the output circuit with a predetermined ratio; and
a bias voltage supply circuit, configured to generate a bias voltage of an integrated circuit (IC) used in the input circuit;
wherein the energy transfer element comprises:
a first winding coupled to the input circuit and having a first unit and a second unit;
a second winding coupled to the output circuit and wound between the first unit of the first winding and the second unit of the first winding; and
a third winding, wound between the first unit of the first winding and the second winding, coupled to the bias voltage supply circuit, and configured to supply the bias voltage, configured to reduce a displacement current generated between the first unit of the first winding and the second winding.
15. The converter of claim 14 , wherein
a winding width of the third winding is greater than a winding width of the first unit of the first winding and a winding width of the second winding.
16. The converter of claim 14 , wherein
the third winding has a plurality of windings.
17. The converter of claim 14 , wherein
one of the two terminals of the third winding is coupled to a ground of the input circuit.
18. The converter of claim 14 , wherein
the energy transfer element further includes a bobbin on which the first to third windings are wound; and
the windings are wound on the bobbin in the order of the second unit of the first winding, the second winding, the third winding, and the first unit of the first winding.
19. The converter of claim 14 , wherein
the energy transfer element further includes a fourth winding, wound between the second unit of the first winding and the second winding, configured to reduce a displacement current generated between the second unit of the first winding and the second winding.
20. The converter of claim 14 , wherein
the energy transfer element further includes a conductive shield, being provided between the second unit of the first winding and the second winding, configured to block a displacement current generated between the second unit of first winding and the second winding.