Method and device of electrical power

• US 8,325,501 B2
• Filed: 06/15/2011
• Issued: 12/04/2012
• 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-Bascopé, Grover Victor
• Primary Examiner(s): Zhang, Jue
• Application Number:
  US13/161,188
• Publication Number:
  US 20110286249A1
• Time in Patent Office: 538 Days
• Field of Search: 363/37, 363/47, 363/59, 363/124, 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 3-phase power converter comprising:

a three-phase voltage source, an EMI-filter, capacitors C_c1-C_c3, boost inductors L_a, L_b and L_c, autotransformers T_a, T_b and T_c, a rectifier and bi-directional controllable switches,

wherein the 3-phase power converter receives input power from the three-phase voltage source via the EMI-filter, the capacitors C_c1-C_c3 are connected between the EMI-filter and the boost inductors, L_a, L_b, L_c to a midpoint of the 3-phase power converter, the input power goes through first, second and third boost inductors L_a, L_b and L_c and the autotransformers T_a, T_b and T_c that are coupled to a rectifier, and the rectifier rectifies the three-phase input voltage into a DC voltage for application to the bi-directional controllable switches connected to the midpoint of the 3-phase power converter.

2. The 3-phase power converter according to claim 1, wherein the three capacitors C_c1-C_c3 are connected in a wye, or Y, configuration between the EMI-filter and the boost inductors, L_a, L_b, L_c to the midpoint of the 3-phase power converter.

3. The 3-phase power converter according to claim 1, wherein the rectifier comprises a plurality of diodes, D_a1-D_a4, D_b1-D_b4 and D_c1-D_c4, arranged in a full bridge configuration.

4. The 3-phase power converter according to claim 3, wherein the bi-directional controllable switches, each connected to a leg of the autotransformer, the autotransformer and diodes comprised in the rectifier form a multi-state switching cell.