Energy transfer circuit having an electromagnetic induction device for utilizing energy stored by a snubber

Abstract

The invention relates to an energy transfer circuit. The energy transfer circuit has a first electromagnetic induction device, electrically connected to a first power supply node; a first switch circuit for connecting the first electromagnetic induction device and a second power supply node according to a first control signal; a snubber electrically connected between the first electromagnetic induction device and the second power supply node; a second electromagnetic induction device, coupled to the first electromagnetic induction device and electrically connected to the snubber and the second power supply node; and a third electromagnetic induction device coupled to the first and second electromagnetic induction devices and electrically connected to an output port of the energy transfer circuit.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram of a conventional voltage converter 10.

FIG. 2 is a diagram illustrating turn off loss according to the prior art.

FIG. 3 is a diagram of a power converter of a first embodiment according to the present invention.

FIG. 4 is a diagram of a snubber shown in FIG. 3 of an embodiment according to the present invention.

FIG. 5 is a diagram of an output module shown in FIG. 3 of a first embodiment according to the present invention.

FIG. 6 is a diagram of an output module shown in FIG. 3 of a second embodiment according to the present invention.

FIG. 7 is a diagram of an output module shown in FIG. 3 of a third embodiment according to the present invention.

FIG. 8 is a diagram illustrating the turn off loss of the power converter according to the present invention.

FIG. 9 is a diagram of a power converter of a second embodiment according to the present invention.

Claims

1. An energy transfer circuit comprising: a first electronic induction device comprising a first end and a second end, wherein the first end of the first electronic induction device is electrically connected to a first power supply node;a first switch device, electrically connected to the second end of the first electronic induction device, for selectively establishing an electrical connection between the second end of the first electronic induction device and a second power supply node according to a first control signal;a snubber, electrically connected between the second end of the first electronic induction device and the second power supply node;a second electronic induction device, coupled to the first electronic induction device, the second electronic induction device comprising a first end and a second end, wherein the first end of the second electronic induction device is electrically connected to the snubber, and the second end of the second electronic induction device is electrically connected to the second power supply node; anda third electronic induction device, coupled to the first electronic induction device and the second electronic induction device, the third electronic induction device comprising a first end and a second end, wherein the second end of the third electronic induction device is electrically connected to an output port of the energy transfer circuit.

2. The energy transfer circuit of claim 1, further comprising: a second switch device, electrically connected between the second end of the second electronic induction device and the second power supply node, for selectively establishing an electrical connection between the second end and the second power supply node according to a second control signal.

3. The energy transfer circuit of claim 2, wherein the first control signal is synchronized with the second control signal for simultaneously turning on/off the first switch device.

4. The energy transfer signal of claim 1, wherein each of the first electronic induction device, the second electronic induction device, and the third electronic induction device comprises at least one induction coil.

5. The energy transfer circuit of claim 4, wherein the first electronic induction device, the second electronic induction device, and the third electronic induction are coiled on a same conductor.

6. The energy transfer circuit of claim 1, having a forward converter configuration.

7. The energy transfer circuit of claim 1, having a flyback converter configuration.

8. The energy transfer circuit of claim 1, having an isolated converter configuration.

9. An energy transfer circuit comprising: a first electronic induction device, comprising a first end and a second end, wherein the first end of the first electronic induction device is electrically connected to a first power supply node;a first switch device, electrically connected to the second end of the first electronic induction device, for selectively establishing an electrical connection between the second end of the first electronic induction device and a second power supply node according to a first control signal;a snubber, electrically connected between the second end of the first electronic induction device and the second power supply node;a second electronic induction device, comprising a first end and a second end, wherein the first end of the second electronic induction device is electrically connected to the snubber, and the second end of the second electronic induction device is electrically connected to the second power supply node;a third electronic induction device, coupled to the first electronic induction device, the third electronic induction device comprising a first end and a second end, wherein the second end of the third electronic induction device is electrically connected to a first output port of the energy transfer circuit; anda fourth electronic induction device, coupled to the second electronic induction device, the fourth electronic induction device comprising a first end and a second end, wherein the second end of the fourth electronic induction device is electrically connected to a second output port of the energy transfer circuit.

10. The energy transfer circuit of claim 9, further comprising: a second switch device, electrically connected between the second end of the second electronic induction device and the second power supply node, for selectively establishing an electrical connection between the second end of the second electronic induction device and the second power supply node according to a second control signal.

11. The energy transfer circuit of claim 10, wherein the first control signal is synchronized with the second control signal for simultaneously turning on/off the first switch device and the second switch device.

12. The energy transfer circuit of claim 9, wherein each of the first electronic induction device, the second electronic induction device, the third electronic induction device, and the fourth electronic induction device comprises at least one induction coil.

13. The energy transfer circuit of claim 9, having a forward converter configuration.

14. The energy transfer circuit of claim 9, having a flyback converter configuration.

15. The energy transfer circuit of claim 9, having an isolated converter configuration.