AC-TO-DC CONVERSION APPARATUS AND RELATED CONTROL MANNER THEREOF

• US 20130016545A1
• Filed: 07/12/2012
• Published: 01/17/2013
• Est. Priority Date: 07/12/2011
• Status: Active Grant

• Current Assignee: FSP-Powerland Technology Inc., FSP Technology Inc.
• Original Assignee: FSP-Powerland Technology Inc., FSP Technology Inc.
• Inventors: Xu, Ming, Chen, Qiao-Liang
• Granted Patent: US 8,780,597 B2
• Time in Patent Office: Days
• US Class Current: 363/126
• CPC Class Codes: H02M 1/0085 Partially controlled bridges
• CPC Class Codes: H02M 1/123 Suppression of common mode voltage or current
• CPC Class Codes: H02M 1/4225 using a non-isolated boost converter
• CPC Class Codes: H02M 1/4233 using a bridge converter comprising active switches
• CPC Class Codes: H02M 1/44 Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
• 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

An AC-to-DC conversion apparatus is provided, and which includes a first switch-element, an output capacitor and a bridgeless power-factor-correction (PFC) circuit. The bridgeless PFC circuit is coupled to an AC input, and includes a first inductor, a second inductor and a bridge circuit constructed by second to fifth switch-elements. The first switch-element is connected between bridgeless PFC circuit and the output capacitor. Under such circuit configuration and suitable control manner, the common-mode interference in the provided AC-to-DC conversion apparatus is lowered and thus reducing the power loss.

Claims

1. An AC-to-DC conversion apparatus, comprising:

a first switch-element;

an output capacitor; and

a bridgeless power factor correction (PFC) circuit, wherein the bridgeless PFC circuit comprising;

a bridge circuit comprising second to fifth switch-elements, wherein the second and the third switch-elements are connected in series to form a first series branch, the fourth and the fifth switch-element are connected in series to form a second series branch, and the first series branch and the second series branch are connected in parallel;

a first inductor, having a first terminal connected to a first terminal of an AC input and a second terminal connected to a common node between the second and the third switch-elements; and

a second inductor, having a first terminal connected to a second terminal of the AC input and a second terminal connected to a common node between the fourth and the fifth switch-elements,

wherein a first group of switch-elements comprise the second and the fourth switch-elements, and are implemented by controllable switch-elements or diodes,

wherein a second group of switch-elements comprise the third and the fifth switch-elements, and are implemented by controllable switch-elements or diodes,

wherein at least one of the first group of switch-elements and the second group of switch-elements are implemented by controllable switch-elements,

wherein a first terminal of the first switch-element is connected to one of a common node between the second and the fourth switch-elements and a common node between the third and the fifth switch-elements,

wherein a second terminal of the first switch-element is connected to a first terminal of the output capacitor,

wherein a second terminal of the output capacitor is connected to the remaining one of the common node between the second and the fourth switch-elements and the common node between the third and the fifth switch-elements.

2. The AC-to-DC conversion apparatus according to claim 1, wherein the first switch-element, the first group of switch-elements and the second group of switch-elements are implemented by controllable switch-elements and the controllable switch-elements are MOSFETs,

wherein the first switch-element is a first MOSFET, the second switch-element is a second MOSFET, the third switch-element is a third MOSFET, the fourth switch-element is a fourth MOSFET, and the fifth switch-element is a fifth MOSFET,

wherein a source of the second MOSFET is connected to a drain of the third MOSFET, a source of the fourth MOSFET is connected to a drain of the fifth MOSFET, a drain of the second MOSFET is connected to a drain of the fourth MOSFET, and a source of the third MOSFET is connected to a source of the fifth MOSFET.

3. The AC-to-DC conversion apparatus according to claim 2, wherein a source of the first MOSFET is connected to the drains of the second and the fourth MOSFETs, and a drain of the first MOSFET is connected to the sources of the third and the fifth MOSFETs through the output capacitor.

4. The AC-to-DC conversion apparatus according to claim 3, wherein:

in a positive half cycle of the AC input, the second MOSFET is kept at an on-state, the fourth MOSFET is served as a master switch, the first and the fifth MOSFETs are switched synchronously, a switching of the fourth MOSFET is complementary to that of the first and the fifth MOSFETs, and the third MOSFET is kept at an off-state,

in a negative half cycle of the AC input, the fourth MOSFET is kept at the on-state, the second MOSFET is served as the master switch, the first and the third MOSFETs are switched synchronously, a switching of the second MOSFET is complementary to that of the first and the third MOSFETs, and the fifth MOSFET is kept at the off-state.

5. The AC-to-DC conversion apparatus according to claim 2, wherein a source of the first MOSFET is connected to the drains of the second and the fourth MOSFETs through the output capacitor, and a drain of the first MOSFET is connected to the sources of the third and the fifth MOSFETs.

6. The AC-to-DC conversion apparatus according to claim 5, wherein:

in a positive half cycle of the AC input, the third MOSFET is kept at an on-state, the fifth MOSFET is served as a master switch, the first and the fourth MOSFETs are switched synchronously, a switching of the fifth MOSFET is complementary to that of the first and the fourth MOSFETs, and the second MOSFET is kept at an off-state,

in a negative half cycle of the AC input, the fifth MOSFET is kept at the on-state, the third MOSFET is served as the master switch, the first and the second MOSFETs are switched synchronously, a switching of the third MOSFET is complementary to that of the first and the second MOSFETs, and the fourth MOSFET is kept at the off-state.

7. The AC-to-DC conversion apparatus according to claim 1, wherein the first switch-element and the first group of switch-elements are implemented by controllable switch-elements and the controllable switch-elements are MOSFETs,

wherein the second group of switch-elements are implemented by diodes,

wherein the first switch-element is a first MOSFET, the second switch-element is a second MOSFET, the third switch-element is a third diode, the fourth switch-element is a fourth MOSFET, and the fifth switch-element is a fifth diode,

wherein a source of the second MOSFET is connected to a cathode of the third diode, a source of the fourth MOSFET is connected to a cathode of the fifth diode, a drain of the second MOSFET is connected to a drain of the fourth MOSFET, and an anode of the third diode is connected to an anode of the fifth diode.

8. The AC-to-DC conversion apparatus according to claim 7, wherein a source of the first MOSFET is connected to the drains of the second and the fourth MOSFETs, and a drain of the first MOSFET is connected to the anodes of the third and the fifth diodes through the output capacitor.

9. The AC-to-DC conversion apparatus according to claim 8, wherein:

in a positive half cycle of the AC input, the second MOSFET is kept at an on-state, the fourth MOSFET is served as a master switch, and a switching of the first MOSFET is complementary to that of the fourth MOSFET,

in a negative half cycle of the AC input, the fourth MOSFET is kept at the on-state, the second MOSFET is served as the master switch, and the switching of the first MOSFET is complementary to that of the second MOSFET.

10. The AC-to-DC conversion apparatus according to claim 1, wherein the first switch-element and the second group of switch-elements are implemented by controllable switch-elements and the controllable switch-elements are MOSFETs,

wherein the first group of switch-elements are implemented by diodes,

wherein the first switch-element is a first MOSFET, the second switch-element is a second diode, the third switch-element is a third MOSFET, the fourth switch-element is a fourth diode, and the fifth switch-element is a fifth MOSFET,

wherein an anode of the second diode is connected to a drain of the third MOSFET, an anode of the fourth diode is connected to a drain of the fifth MOSFET, a cathode of the second diode is connected to a cathode of the fourth diode, and a source of the third MOSFET is connected to a source of the fifth MOSFET.

11. The AC-to-DC conversion apparatus according to claim 10, wherein a drain of the first MOSFET is connected to the sources of the third and the fifth MOSFETs, and a source of the first MOSFET is connected to the cathodes of the second and the fourth diodes through the output capacitor.

12. The AC-to-DC conversion apparatus according to claim 11, wherein:

in a positive half cycle of the AC input, the third MOSFET is kept at an on-state, the fifth MOSFET is served as a master switch, and a switching of the first MOSFET is complementary to that of the fifth MOSFET,

in a negative half cycle of the AC input, the fifth MOSFET is kept at the on-state, the third MOSFET is served as the master switch, and the switching of the first MOSFET is complementary to that of the third MOSFET.

13. The AC-to-DC conversion apparatus according to claim 1, the first switch-element is implemented by a diode, the first group of switch-elements and the second group of switch-elements are implemented by controllable switch-elements, and the controllable switch-elements are MOSFETs,

wherein the first switch-element is a first diode, the second switch-element is a second MOSFET, the third switch-element is a third MOSFET, the fourth switch-element is a fourth MOSFET, and the fifth switch-element is a fifth MOSFET,

wherein a source of the second MOSFET is connected to a drain of the third MOSFET, a source of the fourth MOSFET is connected to a drain of the fifth MOSFET, a drain of the second MOSFET is connected to a drain of the fourth MOSFET, and a source of the third MOSFET is connected to a source of the fifth MOSFET.

14. The AC-to-DC conversion apparatus according to claim 13, wherein an anode of the first diode is connected to the drains of the second and the fourth MOSFETs, and a cathode of the first diode is connected to the sources of the third and the fifth MOSFETs through the output capacitor.

15. The AC-to-DC conversion apparatus according to claim 13, wherein an anode of the first diode is connected to the drains of the second and the fourth MOSFETs through the output capacitor, and a cathode of the first diode is connected to the sources of the third and the fifth MOSFETs.