Regenerative cascaded H bridge power supply

Patent metadata

Field	Value
Publication number	US-10924026-B2
Application number	US-202016837037-A
Country	US
Kind code	B2
Filing date	Apr 1, 2020
Priority date	Apr 24, 2019
Publication date	Feb 16, 2021
Grant date	Feb 16, 2021

Abstract

For a power supply with a reduced number of semiconductor devices, a transformer receives a three-phase primary voltage and steps the three-phase primary voltage up or down to a secondary voltage with a plurality of secondary winding sets to a plurality of first phase voltages, a plurality of second phase voltages, and a plurality of third phase voltages. A plurality of power cell sets each include a plurality of power cells cascaded connected. Each power cell comprises a rectifier and an inverter. The rectifier includes two first active switches that are serially connected and receive a phase voltage at a first switch midpoint, two second active switches that are serially connected and receive another phase voltage at a second switch midpoint, and two capacitors that are serially connected and receive another phase voltage at a capacitor midpoint between the capacitors.

First claim

What is claimed is:

1. A power supply for use with a multi-phase AC load, the power supply comprising:
a phase shifting transformer comprising a primary winding and a plurality of secondary windings magnetically coupled with the primary winding; and
a plurality of power cells, each power cell receiving an input from a respective secondary winding of the plurality of secondary windings and each outputting power to one phase of the multi-phase AC load, wherein power cells outputting power to the same phase of the multi-phase AC load are connected in series;
wherein each power cell comprising:
a rectifier comprising two switches connected in series;
two capacitors connected in series as DC link for smoothing a DC output of the rectifier; and
an inverter comprising two legs of switches, each leg comprising two switches connected in series across the DC link;
wherein a midpoint between the two capacitors is configured to receive a single-phase input from a first terminal of a respective secondary winding, a midpoint between the two switches of the rectifier is configured to receive the single-phase input from a second terminal of the respective secondary winding, and midpoints between the two switches of each leg of the inverter are configured to output power to one phase of the multi-phase AC load.

2. The power supply of claim 1 , wherein the switches of the rectifier are diodes and the switches of inverter are Insulated Gate Bipolar Transistors (IGBTs).

3. The power supply of claim 1 , wherein the switches of the rectifier and the switches of the inverter are Insulated Gate Bipolar Transistors (IGBTs).

4. The power supply of claim 1 , wherein the multi-phase AC load has three phases, three power cells are connected in series to output power to each phase, and for the three secondary windings corresponding to the three power cells, there is 20-degree phase shift one by one.

5. The power supply of claim 1 , wherein the multi-phase AC load has three phases, k power cells are connected in series to output power to each phase, and for the k secondary windings corresponding to the k power cells, there is a phase shift

δ
=

60
⁢
°

k

from each other.

6. A power supply for use with a multi-phase AC load, the power supply comprising:
a phase shifting transformer comprising a primary winding and a plurality of secondary windings magnetically coupled with the primary winding; and
a plurality of power cells, each power cell receiving an input from a respective secondary winding of the plurality of secondary windings and each outputting power to one phase of the multi-phase AC load, wherein power cells outputting power to the same phase of the multi-phase AC load are connected in series;
wherein each power cell comprising:
a rectifier comprising two legs of switches, each leg comprising two switches connected in series;
two capacitors connected in series as DC link for smoothing a DC output of the rectifier; and
an inverter comprising two legs of switches, each leg comprising two switches connected in series across the DC link;
wherein a midpoint between the two capacitors is configured to receive a three-phase input from a first terminal of the respective secondary winding, a midpoint between the two switches of a first leg of the rectifier is configured to receive the three-phase input from a second terminal of the respective secondary winding, a midpoint between the two switches of a second leg of the rectifier is configured to receive the three-phase input from a third terminal of the respective secondary winding, and midpoints between the two switches of each leg of the inverter are configured to output power to one phase of the multi-phase AC load.

7. The power supply of claim 6 , wherein the switches of the rectifier are diodes and the switches of inverter are Insulated Gate Bipolar Transistors (IGBTs).

8. The power supply of claim 6 , wherein the switches of the rectifier and the switches of the inverter are Insulated Gate Bipolar Transistors (IGBTs).

9. The power supply of claim 6 , wherein the multi-phase AC load has three phases, three power cells are connected in series to output power to each phase, and for the three secondary windings corresponding to the three power cells, there is 20-degree phase shift one by one.

10. The power supply of claim 6 , wherein the multi-phase AC load has three phases, k power cells are connected in series to output power to each phase, and for the k secondary windings corresponding to the k power cells, there is a phase shift

δ
=

60
⁢
°

k

from each other.

Assignees

• Rockwell Automation Tech Inc

Inventors

• Zargari Navid R
• Badawi Sarah
• Cheng Zhong Y
• Narimani Mehdi
• Zhang Ye

Classifications

• H02M1/0077

  Plural converter units whose outputs are connected in series · CPC title

• H02M1/0048

  Circuits or arrangements for reducing losses (using snubbers H02M1/34) · CPC title

• H02M1/007

  Plural converter units in cascade (push-pull DC/DC converters with pre-regulator H02M3/3374; DC-AC converters following a DC-DC stage including a high frequency transformer H02M7/4807; DC-AC converters following a DC-DC conversion stage generating periodically varying voltages H02M7/4826) · CPC title

• Y02B70/10

  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 title

• H02M1/12

  Arrangements for reducing harmonics from AC input or output · CPC title