Boost converter

• US 20070096700A1
• Filed: 09/22/2006
• Published: 05/03/2007
• Est. Priority Date: 11/01/2005
• Status: Active Grant

• Current Assignee: ASUSTek Computer, Inc.
• Original Assignee: ASUSTek Computer, Inc.
• Inventors: Hung, Hsiang-Jui, Yang, Sun-Chen, Cheng, Ching-Fu, Weng, Hsiang-Chung
• Granted Patent: US 7,602,156 B2
• Time in Patent Office: Days
• US Class Current: 323/222
• CPC Class Codes: H02M 3/1584 with a plurality of power processing stages connected in parallel

Abstract

A boost converter includes a first boost conversion unit and a second boost conversion unit. Coils of the first boost conversion unit and the second boost conversion unit are coupled with each other. Due to coupling of the coils, the second boost conversion unit releases energy while the first boost conversion unit stores energy in a period of time. Furthermore, due to coupling of the coils, the first boost conversion unit releases energy while the second boost conversion unit stores energy in another period of time. The two boost conversion units operate alternately, thereby adjusting switching loss and averaging output power of components. Furthermore, as switching frequency increases, the coil inductance, as well as the capacitance required in the two boost conversion units can be reduced correspondingly, thus substantially enhancing responses of the two boost conversion units as a whole.

Claims

1. A boost converter, comprising:

a first boost conversion unit, comprising;

a first coil, having a first end coupled to a first voltage level;

a first switch component, coupled between a second end of the first coil and a second voltage level, for selectively connecting the second end of the first coil to the second voltage level;

a second switch component, wherein the first switch component and the second switch component are not turned on simultaneously; and

a capacitor, having a first end coupled to the second switch component and a second end coupled to the second voltage level, wherein the second switch component is coupled between the second end of the first coil and the first end of the capacitor for selectively connecting the second end of the first coil to the first end of the capacitor; and

a second boost conversion unit, comprising;

a second coil, having a first end coupled to the first voltage level;

a third switch component, coupled between a second end of the second coil and the second voltage level, for selectively connecting the second end of the second coil to the second voltage level; and

a fourth switch component, coupled between the second end of the second coil and the first end of the capacitor, for selectively connecting the second end of the second coil to the first end of the capacitor, wherein the third switch component and the fourth switch component are not turned on simultaneously;

wherein the first coil and the second coil are coupled to each other, and when the first switch component is turned on, the fourth switch component is turned on simultaneously, and when the third switch component is turned on, the second switch component is turned on simultaneously.

2. The boost converter of claim 1, wherein the first switch component is a metal oxide semiconductor field effect transistor (MOSFET).

3. The boost converter of claim 1, wherein the third switch component is a MOSFET.

4. The boost converter of claim 1, wherein the second switch component is a diode.

5. The boost converter of claim 1, wherein the fourth switch component is a diode.

6. The boost converter of claim 1, wherein the first coil and the second coil are coils of a transformer.

7. The boost converter of claim 1, wherein an on/off status of the first switch component is determined by a first control clock, an on/off status of the third switch component is determined by a second control clock, and frequencies of the first control clock and the second control clock are adjustable.

8. A boost conversion method, comprising:

storing energy into a first coil of a first boost conversion unit in a first time period, wherein a voltage of the first coil is coupled to a second coil of a second boost conversion unit, and a cross voltage across the second coil is further coupled to a capacitor; and

stopping storing energy into the first coil of the first boost conversion unit in a second time period, wherein a cross voltage across the first coil is coupled to the capacitor, and the cross voltage across the second coil is prohibited from being coupled to the capacitor.

9. The method of claim 8, further comprising:

storing energy into a second coil of the second boost conversion unit in a third time period, wherein a voltage of the second coil is coupled to the first coil of the first boost conversion unit, and the cross voltage across the first coil is further coupled to the capacitor; and

stopping storing energy into the second coil of the second boost conversion unit in a fourth time period, wherein the cross voltage across the second coil is coupled to the capacitor, and the cross voltage across the first coil is prohibited from being coupled to the capacitor.

10. The method of claim 9, wherein the first time period allowing the first coil to store energy is controlled by a first control clock, the third time period allowing the second coil to store energy is controlled by a second control clock, and frequencies of the first control clock and the second control clock are adjustable.

11. The method of claim 8, wherein the first coil and the second coil are coils of a transformer.

12. A boost converter, comprising:

a voltage source, comprising a first voltage level point and a second voltage level point;

at least two conjugate coils, winding around a core, wherein a first coil of the at least two conjugate coils comprises a first coil end and a second coil end, a second coil of the at least two conjugate coils comprises a third coil end and a fourth coil end, and the first coil end and the third coil end are coupled to the first voltage level point;

a first power switch component, comprising a first end and a second end, wherein the first end is coupled with the second coil end, and the second end is coupled with the second voltage level point;

a first switch component, comprising a fourth end and a fifth end, wherein the fourth end is coupled with the second coil end;

a second power switch component, comprising a sixth end and a seventh end, wherein the sixth end is coupled with the fourth coil end, and the seventh end is coupled with the second voltage level point;

a second switch component, comprising a ninth end and a tenth end, wherein the ninth end is coupled with the fourth coil end, and the tenth end is coupled with the fifth end; and

a filter, comprising a first filtering end and a second filtering end, wherein the first filtering end is coupled with the tenth end, and the second filtering end is coupled with the second voltage level point.

13. The boost converter of claim 12, wherein the core is an iron core.

14. The boost converter of claim 12, wherein the first power switch component is a MOSFET.

15. The boost converter of claim 12, wherein the first switch component is a diode.

16. The boost converter of claim 12, wherein the second power switch component is a MOSFET.

17. The boost converter of claim 12, wherein the second switch component is a diode.

18. The boost converter of claim 12, wherein the filter is a capacitor.