DC/DC converter

Patent metadata

Field	Value
Publication number	US-9461538-B2
Application number	US-201315023895-A
Country	US
Kind code	B2
Filing date	Sep 23, 2013
Priority date	Sep 23, 2013
Publication date	Oct 4, 2016
Grant date	Oct 4, 2016

Abstract

It is presented a DC/DC converter for converting power between a first DC connection comprising a first positive terminal and a first negative terminal, and a second DC connection comprising a second positive terminal and a second negative terminal. The DC/DC converter comprises: a first multilevel converter and a second multilevel converter connected serially between the first positive terminal and the first negative terminal, wherein the second positive terminal is connected to a point between the first multilevel converter and the second multilevel converter; and a first filter connected between an AC terminal of the first multilevel converter and an AC terminal of the second multilevel converter, wherein the first filter comprises a capacitor and an inductor.

First claim

The invention claimed is:

1. A DC/DC converter for converting power between a first DC connection comprising a first positive terminal and a first negative terminal, and a second DC connection comprising a second positive terminal and a second negative terminal, the DC/DC converter comprising:
a first multilevel converter and a second multilevel converter connected serially between the first positive terminal and the first negative terminal, wherein the second positive terminal is connected to a point between the first multilevel converter and the second multilevel converter; where each converter has n phases, where n is a number of two or more, and for each phase there is an upper converter arm and a lower converter arm, each comprising a number of serially connected converter cells, where there are inductors between the upper and lower converter arms and respective AC terminals are provided between the inductors of each phase, and
a first filter connected between an AC terminal of the first multilevel converter and an AC terminal of the second multilevel converter, wherein the first filter comprises a capacitor and an inductor.

2. The DC/DC converter according to claim 1 , wherein the first negative terminal is connected to ground and the second negative terminal is connected to ground.

3. The DC/DC converter according to claim 2 , wherein for the first filter and the second filter when present, the inductor is a reactor component.

4. The DC/DC converter according to claim 2 , wherein for the first filter and the second filter when present, the inductor is implemented by a parasitic inductance.

5. The DC/DC converter according to claim 2 , wherein the first filter and the second filter when present, comprises a resistor.

6. The DC/DC converter according to claim 1 , further comprising:
a third multilevel converter and a fourth multilevel converter connected serially between the second multilevel converter and the first negative terminal, wherein the second negative terminal is connected to a point between the third multilevel converter and the fourth multilevel converter; and
a second filter connected between an AC terminal of the third multilevel converter and an AC terminal of the fourth multilevel converter, wherein the second filter comprises a capacitor and an inductor.

7. The DC/DC converter according to claim 6 , wherein for the first filter and the second filter when present, the inductor is a reactor component.

8. The DC/DC converter according to claim 6 , wherein for the first filter and the second filter when present, the inductor is implemented by a parasitic inductance.

9. The DC/DC converter according to claim 6 , wherein the first filter and the second filter when present, comprises a resistor.

10. The DC/DC converter according to claim 1 , wherein for the first filter and the second filter when present, the inductor is a reactor component.

11. The DC/DC converter according to claim 10 , wherein for the first filter and the second filter when present, the inductor is implemented by a parasitic inductance.

12. The DC/DC converter according to claim 10 , wherein the first filter and the second filter when present, comprises a resistor.

13. The DC/DC converter according to claim 1 , wherein for the first filter and the second filter when present, the inductor is implemented by a parasitic inductance.

14. The DC/DC converter according to claim 13 , wherein the first filter and the second filter when present, comprises a resistor.

15. The DC/DC converter according to claim 1 , wherein the first filter and the second filter when present, comprises a resistor.

16. The DC/DC converter according to claim 1 , wherein a main resonance frequency of the first filter and the second filter, when present, is less than the frequency provided on the AC terminals of the multilevel converters.

17. The DC/DC converter according to claim 1 , wherein an impedance of the first filter and the second filter, when present, is at a minimum at its respective main resonance frequency.

18. The DC/DC converter according to claim 1 , wherein the capacitor of the first filter and the second filter when present, blocks DC through the respective filter.

19. The DC/DC converter according to claim 1 , wherein each multilevel converter comprises a plurality of converter cells.

20. The DC/DC converter according to claim 19 , wherein each one of the converter cells comprises at least one switching element and at least one energy storage element.

Assignees

• Abb Technology Ltd

Inventors

• Srivastava Kailash
• Alves Roberto
• Lazarczyk Michal

Classifications

• H02M3/24

  by static converters · CPC title

• H02M3/156

  with automatic control of output voltage or current, e.g. switching regulators · CPC title

• H02M7/483

  Converters with outputs that each can have more than two voltages levels · CPC title

• H02M3/155 Primary

  using semiconductor devices only · CPC title

• H02M1/4266

  using passive elements · CPC title