Method and device of electrical power

• US 8,395,913 B2
• Filed: 10/10/2011
• Issued: 03/12/2013
• Est. Priority Date: 05/24/2010
• Status: Active Grant

• Current Assignee: Huawei Digital Power Technologies Company Limited (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Torrico-Bascop, Grover Victor
• Primary Examiner(s): Zhang, Jue
• Application Number:
  US13/270,021
• Publication Number:
  US 20120032651A1
• Time in Patent Office: 519 Days
• Field of Search: 363/37, 363/47, 363/59, 363/124, 363/126, 323/208
• US Class Current: 363/47
• CPC Class Codes: H02M 1/0064 Magnetic structures combining different functions, e.g. storage, filtering or transformation
• CPC Class Codes: H02M 1/4216 operating from a three-phase input voltage H02M1/4233 takes precedence
• 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

Abstract

A power factor correction of three-phase boost-type conversion is disclosed. Embodiments comprising multi-leg autotransformers are disclosed, e.g. comprising 3-phase low-pass filtering impedances such as capacitors between an input of a converter and a midpoint of the output.

Claims

1. A device comprising:

an autotransformer inter-connecting each phase to a midpoint, wherein the device corrects power factor of a 3-phase power converter; and

the autotransformer comprising two transformer legs, or the autotransformer comprises two transformer windings;

two diodes connecting each transformer leg to the mid-point, or two diodes connecting each transformer winding to the mid-point; and

a plurality of controllable bi-directional switches connecting as closed each transformer leg to the midpoint, or a plurality of controllable bi-directional switches connecting as closed each transformer winding to the midpoint,

wherein two controllable bi-directional switches, each connected to a leg of the autotransformer, the autotransformer and the diodes form a five-state switching cell, or two controllable bi-directional switches, each connected to a winding of the autotransformer, the autotransformer and the diodes form a five-state switching cell.

2. The device according to claim 1, further comprising a low-pass filtering impedance connecting a three-phase input of the device to a midpoint of the output of the device.

3. The device according to claim 1, further comprising a capacitor connecting each phase of a three-phase input of the power converter to a midpoint of the output of the power converter.

4. The device according to claim 1, further comprising bi-directional switches connecting each phase to the mid-point.

5. The device according to claim 1, wherein the respective diodes are connected to the positive and negative side of the output of the power converter.

6. The device according to claim 1, wherein the midpoint is the mid-point of a positive principal voltage and a negative principal voltage, the principal voltage being greater than the line voltage.