Energy transfer apparatus for reducing conductivity electromagnetic interference and manufacturing method thereof

1. An energy transfer apparatus for reducing a conductivity electromagnetic interference for a power supply, connected to an input voltage for outputting an output voltage, comprising:

a core;

an input winding, wound around the core;

an output winding, wound around the core, the output winding capacitively coupled to the input winding;

a supply voltage, coupled to a controller for providing an operating voltage;

a shielding winding, wound around the core, the shielding winding electrically coupled to the input winding and capacitively coupled to the output winding, and an electric potential produced by a capacitive coupling between the shielding winding and the output winding for reducing a potential difference between the input winding and the output winding for stabilizing an electric potential between an input-grounding terminal and an output-grounding terminal of the energy transfer apparatus to reduce the conductivity electromagnetic interference; and

an auxiliary winding, wound around the core, the auxiliary winding electrically coupled to the shielding winding and the input winding and further capacitively coupled to the output winding;

wherein the input winding receives the input voltage for outputting the output voltage through the core and the output winding, and outputting the supply voltage through the shielding winding and the auxiliary winding, the output voltage and the supply voltage are produced in proportional to the input voltage respectively.

2. The energy transfer apparatus as claimed in claim 1 , wherein a ratio of sum of the winding turns of the shielding winding and the auxiliary winding to the winding turns of the output winding is equal to a ratio of the supply voltage to the output voltage.

3. The energy transfer apparatus as claimed in claim 1 , wherein the winding turns of the shielding winding are fully wound on one layer of a bobbin.

4. The energy transfer apparatus as claimed in claim 1 , wherein the winding turns of the shielding winding is equal to the output winding, the shielding winding is used for multiple-parallel winding with fully wound on one layer of a bobbin once the wire size of the shielding winding is smaller than the output winding.

5. The energy transfer apparatus as claimed in claim 1 , wherein the difference in winding turns between the shielding winding and the output winding is one turn, the shielding winding is used for multiple-parallel winding and fully wound on one layer of a bobbin once the wire size of the shielding winding is smaller than the output winding.

6. The energy transfer apparatus as claimed in claim 1 , wherein the winding phase of the shielding winding and the auxiliary winding are equal to the output winding.

7. The energy transfer apparatus as claimed in claim 1 , wherein the input winding is close to the core more than the auxiliary winding, the shielding winding and the output winding; the auxiliary winding is close to the core more than the shielding winding and the output winding; the shielding winding is close to the core more than the output winding.

8. A manufacturing method of the energy transfer apparatus, comprising:

wound an input winding around a core;

wound an auxiliary winding around the input winding, the input winding being close to the core more than the auxiliary winding, and installing an insulator between the input winding and the auxiliary winding;

wound a shielding winding around the auxiliary winding, the auxiliary winding being close to the core more than the shielding winding, and installing the insulator between the auxiliary winding and the shielding winding; and

wound an output winding around the shielding winding, the shielding winding being close to the core more than the output winding, and installing the insulator between the shielding winding and the output winding.

9. The manufacturing method of the energy transfer apparatus as claimed in claim 8 , wherein a ratio of sum of the winding turns of the shielding winding and the auxiliary winding to the winding turns of the output winding is equal to a ratio of a supply voltage to an output voltage.

10. The manufacturing method of the energy transfer apparatus as claimed in claim 8 , wherein the winding turns of the shielding winding and the output winding fully wound on one layer of a bobbin respectively.

11. The manufacturing method of the energy transfer apparatus as claimed in claim 8 , wherein the shielding winding is equal to the output winding in the winding turns, the shielding winding is used for multiple-parallel winding and fully wound on one layer of a bobbin once the wire size of the shielding winding is smaller then the output winding.

12. The method of manufacturing the energy transfer apparatus as claimed in claim 8 , wherein the difference in winding turns between the shielding winding and the output winding is one turn, the shielding winding is used for multiple-parallel winding and fully wound on one layer of a bobbin once the wire size of the shielding winding is smaller than the output winding.

13. The method of manufacturing the energy transfer apparatus as claimed in claim 8 , wherein the winding phase of the shielding winding and the auxiliary winding are equal to the output winding.