Bridge-less boost (BLB) power factor correction topology controlled with one cycle control

• US 20050105311A1
• Filed: 09/29/2004
• Published: 05/19/2005
• Est. Priority Date: 10/01/2003
• Status: Active Grant

• Current Assignee: International Rectifier Corporation (Infineon Technologies AG)
• Original Assignee: International Rectifier Corporation (Infineon Technologies AG)
• Inventors: Soldano, Marco
• Granted Patent: US 7,164,591 B2
• Time in Patent Office: Days
• US Class Current: 363/89
• CPC Class Codes: H02M 1/0085 Partially controlled bridges
• CPC Class Codes: H02M 1/4216 operating from a three-phase input voltage H02M1/4233 takes precedence
• CPC Class Codes: H02M 1/4225 using a non-isolated boost converter
• CPC Class Codes: H02M 7/219 in a bridge configuration
• 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

The bridgeless boost topology reduces the power dissipation, cost, and size of prior PFC systems by eliminating the intrinsic loss of the input rectifier bridge. Sensing of the input line voltage by the controller is unnecessary. The use of One Cycle Control (also known as Single Cycle Control) allows the Power Factor Correction function to be performed without complex rectification networks to obtain the AC line voltage reference. The use of bi-directional switches makes it possible to control inrush current (the startup over-current due to the charging of the output bulk capacitor), which allows elimination of over-current limiting devices and reduction of the diode surge capability requirements. Moving the boost inductor to the system input adds an additional filtering function, reducing the cost of input EMI filtering.

Claims

1. A bridgeless PFC boost converter comprising:

a boost inductor having a first end connected to a first AC input terminal and a second end connected to a first junction defined between the anode of a first diode and a first terminal of a first switch;

a second terminal of the first switch connected to a common line;

a parallel circuit of a capacitance and a load connected between the cathode of the first diode and the common line;

a series circuit of a second diode and a second switch connected between the cathode of the first diode and the common line;

a second AC input terminal connected to a second junction defined between the anode of the second diode and the second switch; and

a control circuit connected for controlling the first and second switches so as to provide power factor correction with respect to power applied to said load.

2. A bridgeless PFC boost converter according to claim 1, wherein said first and second switches are bidirectional switches.

3. A bridgeless PFC boost converter according to claim 2, wherein said bidirectional switches are bidirectional MOSFETs.

4. A bridgeless PFC boost converter according to claim 2, wherein said bidirectional switches are GaN devices.

5. A bridgeless PFC boost converter according to claim 1, further comprising another boost inductor connected between said second AC input terminal and said second junction.

6. A bridgeless PFC boost converter according to claim 5, further comprising a series circuit of a third diode and a third switch connected in parallel with said first and second diodes and switches, and a third boost inductor connected between a third AC input terminal and a third junction defined between the third switch and the anode of the third diode.

7. A bridgeless PFC boost converter according to claim 1, wherein said first and second switches are MOSFETs, each having a respective body diode whose cathode is connected to the corresponding one of said first and second junction points.

8. A bridgeless PFC boost converter according to claim 7, wherein said MOSFETs each have a pair of main terminals connected respectively to said common line and to the corresponding one of said first and second junctions;

and a gate terminal connected to said control circuit.

9. A bridgeless PFC boost converter according to claim 7, wherein said control circuit implements single cycle control wherein said first and second switches are controlled in response to current in said first and second switches and said first and second diodes.

10. A bridgeless PFC boost converter according to claim 7, wherein said control circuit implements single cycle control wherein said first and second switches are controlled in response to current in said first and second switches and to an output voltage across said load.

11. A bridgeless PFC boost converter according to claim 7, wherein said control circuit implements single cycle control wherein said first and second switches are controlled in response to an output voltage across said load and to peak current in said boost inductors.

12. A bridgeless PFC boost converter according to claim 1, wherein said control circuit implements single cycle control wherein said first and second switches are controlled in response to current in said first and second switches and said first and second diodes.

13. A bridgeless PFC boost converter according to claim 1, wherein said control circuit implements single cycle control wherein said first and second switches are controlled in response to current in said first and second switches and to an output voltage across said load.

14. A bridgeless PFC boost converter according to claim 1, wherein said control circuit implements single cycle control wherein said first and second switches are controlled in response to an output voltage across said load and to peak current in said boost inductors.