BRIDGELESS PFC CONVERTER WITH LOW COMMON-MODE NOISE AND HIGH POWER DENSITY

• US 20070279955A1
• Filed: 04/04/2007
• Published: 12/06/2007
• Est. Priority Date: 05/30/2006
• Status: Active Grant

• Current Assignee: Delta Electronics Incorporated
• Original Assignee: Delta Electronics Incorporated
• Inventors: Liu, Teng, Xin, Xiaoni, Zeng, Jianhong, Ying, Jianping, Zhao, Wei
• Granted Patent: US 7,605,570 B2
• Time in Patent Office: Days
• US Class Current: 363/125
• CPC Class Codes: H02M 1/0043 Converters switched with a phase shift, i.e. interleaved non-isolated DC/DC converters H02M3/1586
• CPC Class Codes: H02M 1/0085 Partially controlled bridges
• CPC Class Codes: H02M 1/4208 Arrangements for improving power factor of AC input
• CPC Class Codes: H02M 1/4225 using a non-isolated boost converter
• CPC Class Codes: Y02B 70/10 Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
• CPC Class Codes: Y02P 80/10 Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier

Abstract

A bridgeless power factor correction converter that can reduce common-mode noise and enhance power density is made up of a boost inductor coupled to an input end, a bidirectional switch connected in series with the boost inductor, a first series rectifying circuit having a junction node connected between the boost inductor and the bi-directional switch, a second series rectifying circuit connected in parallel with the first series rectifying circuit and having a junction node coupled to the bi-directional switch, and an output capacitor connected in parallel with the second series rectifying circuit, in which the second series rectifying circuit is made up of slow-recovery diodes and the first series rectifying circuit is made up of fast-recovery diodes.

Claims

1. A power factor correction converter, comprising:

a boost inductor connected to an AC input terminal;

a switch circuit connected in series with the boost inductor;

a first series rectifier circuit having a junction node connected between the boost inductor and the switch circuit;

a second series rectifier circuit connected in parallel with the first series rectifier circuit and having a junction node connected to the switch circuit; and

an output capacitor connected in parallel with the second series rectifier circuit;

wherein the first series rectifier circuit comprises rectifying diodes having a fast reverse recovery characteristic, and the second series rectifier circuit comprises rectifying diodes having a slow reverse recovery characteristic.

2. The power factor correction converter according to claim 1 wherein the switch circuit comprises a bidirectional switch.

3. The power factor correction converter according to claim 2 wherein the bidirectional switch is made up of metal-oxide-semiconductor field effect transistors.

4. The power factor correction converter according to claim 1 further comprising a pair of auxiliary switches connected in parallel with the second series rectifier circuit and configured to perform switching operations in synchronization with the frequency of an AC input of the power factor correction converter.

5. The power factor correction converter according to claim 1 further comprising at least one auxiliary capacitor connected in parallel with the second series rectifier circuit and configured to perform filtering operations to the voltage across the second series rectifier circuit.

6. The power factor correction converter according to claim 1 wherein the switching frequency of the rectifying diodes having a fast reverse recovery characteristic is the same with the switching frequency of the switch circuit, and the switching frequency of the rectifying diodes having a slow reverse recovery characteristic is the same with the operating frequency of the input voltage of the power factor correction converter.

7. The power factor correction converter according to claim 1 wherein the reverse recovery time of the rectifying diodes having a slow reverse recovery characteristic is more than two times longer than the double of the reverse recovery time of the rectifying diodes having a fast reverse recovery characteristic.

8. The power factor correction converter according to claim 1 wherein the switch circuit is configured to cease switching operation when an input current is relatively small and start switching operation when the input current is relatively large.

9. The power factor correction converter according to claim 1 wherein the switch circuit is configured to cease switching operation when an input voltage is relatively small and start switching operation when the input voltage is relatively large.

10. A power factor correction converter, comprising:

a first power converter stage, comprising;

a first boost inductor connected to an AC input terminal;

a first switch circuit connected in series with the first boost inductor;

a first series rectifier circuit having a junction node connected between the first boost inductor and the first switch circuit; and

a second series rectifier circuit connected in parallel with the first series rectifier circuit and having a junction node connected to the first switch circuit;

a second power converter stage, comprising;

a second boost inductor connect to the AC input terminal and connected in parallel with the first boost inductor;

a second switch circuit connected between the second boost inductor and the first switch circuit; and

a third series rectifier circuit connected in parallel with the second series rectifier circuit and having a junction node connected between the second boost inductor and the second switch circuit; and

an output capacitor connected in parallel with the third series rectifier circuit;

wherein the first series rectifier circuit and the third series rectifier circuit comprise rectifying diodes having a fast reverse recovery characteristic, and the second series rectifier circuit comprises rectifying diodes having a slow reverse recovery characteristic.

11. The power factor correction converter according to claim 10 wherein the first switch circuit comprises a bidirectional switch.

12. The power factor correction converter according to claim 10 wherein the second switch circuit comprises a bidirectional switch.

13. The power factor correction converter according to claim 10 wherein the reverse recovery time of the rectifying diodes having a slow reverse recovery characteristic is longer than the double of the reverse recovery time of the rectifying diodes having a fast reverse recovery characteristic.

14. A power factor correction converter, comprising:

a first power converter stage, comprising;

a first boost inductor connected to an AC input terminal;

a first switch circuit connected in series with the first boost inductor;

a first series rectifier circuit having a junction node connected between the first boost inductor and the first switch circuit; and

a second series rectifier circuit connected in parallel with the first series rectifier circuit and having a junction node connected to the first switch circuit;

a second power converter stage, comprising;

a second boost inductor coupled to the AC input terminal and connected in parallel with the first boost inductor;

a second switch circuit connected in series with the second boost inductor;

a third series rectifier circuit having a junction node connected between the second boost inductor and the second switch circuit; and

a fourth series rectifier circuit connected in parallel with the third series rectifier circuit and having a junction node connected to the second switch circuit; and

an output capacitor connected in parallel with the fourth series rectifier circuit;

wherein the first series rectifier circuit and the third series rectifier circuit comprise rectifying diodes having a fast reverse recovery characteristic, and the second series rectifier circuit and the fourth series rectifier circuit comprise rectifying diodes having a slow reverse recovery characteristic.

15. The power factor correction converter according to claim 14 wherein the first switch circuit comprises a bidirectional switch.

16. The power factor correction converter according to claim 14 wherein the second switch circuit comprises a bidirectional switch.

17. The power factor correction converter according to claim 14 wherein the reverse recovery time of the rectifying diodes having a slow reverse recovery characteristic is longer than the double of the reverse recovery time of the rectifying diodes having a fast reverse recovery characteristic.