Power converter

• US 20070297204A1
• Filed: 03/19/2007
• Published: 12/27/2007
• Est. Priority Date: 06/23/2006
• Status: Abandoned Application

• Current Assignee: Delta Electronics Incorporated
• Original Assignee: Delta Electronics Incorporated
• Inventors: Lu, Zeng-Yi, Chen, Wei
• Application Number:
  US11/723,340
• Publication Number:
  US 20070297204A1
• Time in Patent Office: Days
• US Class Current: 363/131
• CPC Class Codes: H01F 2017/0093 Common mode choke coil
• CPC Class Codes: H01F 2038/006 matrix transformer consisting of several interconnected individual transformers working as a whole
• CPC Class Codes: H01F 30/16 Toroidal transformers
• CPC Class Codes: H02M 1/0064 Magnetic structures combining different functions, e.g. storage, filtering or transformation
• CPC Class Codes: H02M 3/1584 with a plurality of power processing stages connected in parallel

Abstract

A power converter includes a power generating unit, at least two switching units, at least two transformers and a power outputting unit. The power generating unit generates a power signal. The switching units are electrically connected to the power generating unit, and the switching units respectively generate at least one switching signal according to the power signal. The transformers are electrically connected to the switching units, respectively. Each transformer has a first coil and a second coil. The first coils respectively receive the switching signals, and the second coils are electrically connected to each other in series. The power outputting unit is electrically connected to the first coils of the transformers.

Claims

1. A power converter comprising:

a power generating unit for generating a power signal;

at least two switching units electrically connected to the power generating unit for generating at least one switching signal according to the power signal, respectively;

at least two transformers electrically connected to the switching units, respectively, wherein each of the transformers has a first coil receiving the switching signals, and a second coil electrically connected to each other in series; and

a power outputting unit electrically connected to the first coils of the transformers.

2. The power converter according to claim 1, wherein the power converter is a DC to DC buck power converter, and the switching units are bipolar transistors or field effect transistors.

3. The power converter according to claim 1, wherein a phase difference between the switching signals is 360/n degrees, wherein n is the number of the switching units.

4. The power converter according to claim 1, further comprising a first inductor electrically connected to the second coils of the transformers.

5. The power converter according to claim 4, wherein the first inductor is a linear inductor or a non-linear inductor.

6. The power converter according to claim 4, wherein the first inductor is electrically connected to and between the second coils of the transformers in series.

7. The power converter according to claim 1, further comprising a second inductor electrically connected to the power outputting unit and the first coils of the transformers.

8. The power converter according to claim 1, further comprising a capacitor electrically connected to the power outputting unit.

9. The power converter according to claim 1, wherein the second coils are electrically connected together in series to form a loop.

10. The power converter according to claim 1, wherein coupling coefficients of the transformers are less than 0.95.

11. A power converter comprising:

a power generating unit for generating a power signal;

a first switching unit electrically connected to the power generating unit for generating at least one first switching signal according to the power signal;

a second switching unit electrically connected to the power generating unit for generating at least one second switching signal according to the power signal;

at least one magnetic body having a central magnetic column, a first magnetic column, a second magnetic column, a central coil wound around the central magnetic column, a first coil wound around the first magnetic column, and a second coil wound around the second magnetic column, wherein the first magnetic column and the second magnetic column are respectively disposed on two sides of the central magnetic column, the first coil is electrically connected to the first switching unit for receiving the first switching signal, and the second coil is electrically connected to the second switching unit for receiving the second switching signal; and

a power outputting unit respectively electrically connected to the first coil and the second coil of the magnetic body.

12. The power converter according to claim 11, wherein the power converter is a DC to DC buck power converter, and the switching units are bipolar transistors or field effect transistors.

13. The power converter according to claim 11, wherein a phase difference between the switching signals is 360/n degrees, wherein n is the number of transformers provided by the magnetic bodies.

14. The power converter according to claim 11, further comprising a first inductor electrically connected to the central coil of the magnetic body in series.

15. The power converter according to claim 11, further comprising a second inductor electrically connected to the power outputting unit, the first coil and the second coil.

16. The power converter according to claim 11, further comprising a capacitor electrically connected to the power outputting unit.

17. The power converter according to claim 11, wherein the central coils are electrically connected together in series to form a loop.

18. The power converter according to claim 11, wherein each of the first switching unit and the second switching unit has a first switching element and a second switching element, and the first switching elements and the second switching elements are electrically connected to the first coil and the second coil in parallel, respectively.

19. A power converter comprising:

a power generating unit for generating a power signal;

a first switching unit, which is electrically connected to the power generating unit and generates at least one first switching signal according to the power signal;

a second switching unit, which is electrically connected to the power generating unit and generates at least one second switching signal according to the power signal;

at least one magnetic body having a central magnetic column, a first magnetic column, a second magnetic column, a first coil wound around the first magnetic column, a first additional coil wound around the first magnetic column, a second coil wound around the second magnetic column and a second additional coil wound around the second magnetic column, wherein the first additional coil and the second additional coil are electrically connected together in series, the first coil is electrically connected to the first switching unit for receiving the first switching signal, and the second coil is electrically connected to the second switching unit for receiving the second switching signal; and

a power outputting unit electrically connected to the first coil and the second coil of the magnetic body.

20. The power converter according to claim 19, further comprising a first inductor electrically connected to the first additional coil of the magnetic body in series.