Regenerative cascaded H bridge power supply

Patent metadata

Field	Value
Publication number	US-10924025-B2
Application number	US-201916698392-A
Country	US
Kind code	B2
Filing date	Nov 27, 2019
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 comprising:
a transformer that 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; and
a plurality of power cell sets that each comprise a plurality of power cells cascaded connected, wherein each power cell comprises a rectifier and an inverter, the rectifier comprising two first active switches that are serially connected and receive a phase voltage from a first secondary winding of a given secondary winding set at a first switch midpoint, two second active switches that are serially connected and receive another phase voltage from a second secondary winding of the given winding set at a second switch midpoint, and two capacitors in parallel with the rectifier and the inverter that are serially connected and receive another phase voltage from a third secondary winding of the given secondary winding set at a capacitor midpoint between the capacitors, wherein the two first active switches, the two second active switches, and the two capacitors of each power cell are connected in parallel.

2. The power supply of claim 1 , wherein the active switches are switched as a first position with a first top active switch and second bottom active switch on, a second position with first top active switch and a second top active switch on, a third position with a second bottom active switch and second top active switch on, and a first bottom fourth position with active switch and second bottom active switch on.

3. The power supply of claim 1 , wherein the inverter is an H-bridge of four active switches.

4. The power supply of claim 1 , wherein the transformer comprises a primary winding, three power cell sets, and 3k secondary winding sets, a secondary phase shift is

δ
=

60
k

degrees between the secondary winding sets for each power cell set, and each power cell set comprises k power cells, wherein k is in integer.

5. The power supply of claim 4 , wherein for first power cells, the first switch midpoint receives the second phase voltage from an (av) secondary winding set, the second switch midpoint receives the third phase voltage from an (aw) secondary winding set, and the capacitor midpoint receives the first phase voltage from an (au) secondary winding set, for second power cells, the first switch midpoint receives the third phase voltage from a (bw) secondary winding set, the second switch midpoint receives the first phase voltage from a (bu) secondary winding set, and the capacitor midpoint receives the second phase voltage from a (bv) secondary winding set, and for third power cells, the first switch midpoint receives the first phase voltage from a (cu) secondary winding set, the second switch midpoint receives the second phase voltage from a (cv) secondary winding set, and the capacitor midpoint receives the third phase voltage from a (cw) secondary winding set.

6. The power supply of claim 5 , wherein k=3, the switching frequency is 4020 Hertz (Hz), the power cells are controlled with sinusoidal pulse width modulation control signals, and the carrier angle phase shifts are the same for the rectifiers in all power cells.

7. The power supply of claim 4 , wherein for all power cells, the first switch midpoint, the second switch midpoint, and the third switch midpoint are connected in a same phase sequence.

8. The power supply of claim 7 , wherein k=3, the switching frequency is 4020 Hz., and in all power cells the power cells, the first switch midpoint receives the same phase voltage from a u secondary winding set, the second switch midpoint receives the second phase voltage from a v secondary winding set, and the capacitor midpoint receives the third phase voltage from a w secondary winding set, the power cells are controlled with sinusoidal pulse width modulation control signals, and carrier angle phase shifts are the same for the rectifiers.

9. The power supply of claim 4 , wherein there are k power cell rows, for a power cell row x, where x=3L−2 for L is integer and L=1 to the upper integer limit of

(

k
3

)

,

the first switch midpoint receives the second phase voltage from an (av) secondary winding set, the second switch midpoint receives the third phase voltage from an (aw) secondary winding set, and the capacitor midpoint receives the first phase voltage from an (au) secondary winding set, for a power cell row y, where y is integer equals to x+1 and ranges from 2 to k, the first switch midpoint receives the third phase voltage from a (bw) secondary winding set, the second switch midpoint receives the first phase voltage from a (bu) secondary winding set, and the capacitor midpoint receives the second phase voltage from a (bv) secondary winding set, and for a power cell row z, where z is integer equals to x+2 and ranges from 3 to k, the first switch midpoint receives the first phase voltage from a (cu) secondary winding set, the second switch midpoint receives the second phase voltage from a (cv) secondary winding set, and the capacitor midpoint receives the third phase voltage from a (cw) secondary winding set.

10. The power supply of claim 9 , wherein the power cells are controlled with sinusoidal pulse width modulation control signals, and carrier angles θ 1 , θ 2 , and θ 3 for the rectifier in the power cells are phase shifted by 120 degrees.

11. The power supply of claim 10 , wherein k=3 and the switching frequency is 1980 Hz.

12. The power supply of claim 1 , wherein the transformer comprises a primary winding, three power cell sets, 3k secondary winding sets with no secondary phase shifts between the secondary winding sets, each power cell set comprises k power cells, and k is in integer.

13. The power supply of claim 12 , wherein for first power cells, the first switch midpoint receives the second phase voltage from an (av) secondary winding set, the second switch midpoint receives the third phase voltage from an (aw) secondary winding set, and the capacitor midpoint receives the first phase voltage from an (au) secondary winding set, for second power cells, the first switch midpoint receives the third phase voltage from a (bw) secondary winding set, the second switch midpoint receives the first phase voltage from a (bu) secondary winding set, and the capacitor midpoint receives the second phase voltage from a (bv) secondary winding set, and for third power cells, the first switch midpoint receives the first phase voltage from a (cu) secondary winding set, the second switch midpoint receives the second phase voltage from a (cv) secondary winding set, and the capacitor midpoint receives the third phase voltage from a (cw) secondary winding set.

14. The power supply of claim 13 , wherein the power cells are controlled with sinusoidal pulse width modulation control signals, carrier angles θ n for the rectifiers for each power cell row are the same, the carrier phase shifting angles θ 1 , θ 2 , . . . , θ k of the rectifiers in different power cell rows are shifted by

3

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

• H02M7/49 Primary

  Combination of the output voltage waveforms of a plurality of converters · CPC title