CONVERTER FOR SINGLE-PHASE AND THREE-PHASE OPERATION, D.C. VOLTAGE SUPPLY AND BATTERY CHARGER

• US 20110261591A1
• Filed: 01/26/2010
• Published: 10/27/2011
• Est. Priority Date: 01/29/2009
• Status: Active Grant

• Current Assignee: Brusa Technology AG
• Original Assignee: BRUSA Elektronik AG
• Inventors: Krause, Axel
• Granted Patent: US 8,503,208 B2
• Time in Patent Office: Days
• US Class Current: 363/17
• CPC Class Codes: H02M 1/10 Arrangements incorporating converting means for enabling loads to be operated at will from different kinds of power supplies, e.g. from ac or dc
• CPC Class Codes: H02M 3/33584 Bidirectional converters
• CPC Class Codes: H02M 5/4585 having a rectifier with controlled elements
• CPC Class Codes: H02M 7/066 particular circuits having a special characteristic
• CPC Class Codes: H02M 7/219 in a bridge configuration
• 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 Converter (1a.1c) for single-phase and three-phase Operation which comprises a three-phase rectifier to which three coils (L_a, L_b, L_c) are connected on the mains side is described. A first coil (L_a) is provided on the mains side with a switch (S) which connects the first coil (L_a) to the mains during three-phase Operation and connects it via a capacitor (C) either to the lower end (FP) of the rectifier or on the mains side to another coil (L_b, L_c) during single-phase Operation. In addition, a d.c. voltage supply and a battery charger (5a.5c) which comprise the Converter (1a.1c) according to the invention are described.

Claims

1-11. -11. (canceled)

12. A converter system for single-phase and three-phase operation comprising:

a converter;

a first mains branch for said converter;

said first mains branch connected at a point between a first set of two rectifying diodes in series;

a first choke coil in said first mains branch, said first choke coil located before said connection point to between said first set of two rectifying diodes;

a second mains branch for said converter;

said second mains branch connected at a second point between a second set of two rectifying diodes in series;

a second choke coil in said second mains branch, said second choke coil located before said connection second point to between said second set of two rectifying diodes;

a third mains branch for said converter;

a switch;

a third choke coil connected to said switch and to a third connection point between a third set of two rectifying diodes;

said switch having a first position that connects said third choke coil to said third mains branch for three-phase current conversion; and

,

said switch having for single-phase current conversion a second position that connects said third choke coil to a capacitor, said capacitor also connected to a low end of said converter system.

13. A converter system as claimed in claim 12, further comprising:

a respective switch connected antiparallel to each one of said rectifying diodes.

14. A converter system as claimed in claim 12, further comprising:

a two-pole inverter connected to said low end of said converter and to a high end of said converter;

a transformer primary side connected to said inverter; and

,

a transformer secondary side, said transformer secondary side connected to a two-pole rectifier configured for load connection.

15. A converter system for single-phase and three-phase operation comprising:

a converter;

a first mains branch for said converter;

said first mains branch connected at a point between a first set of two rectifying diodes in series;

a first choke coil in said first mains branch, said first choke coil located before said connection point to between said first set of two rectifying diodes;

a second mains branch for said converter;

said second mains branch connected at a second point between a second set of two rectifying diodes in series;

a second choke coil in said second mains branch, said second choke coil located before said connection second point to between said second set of two rectifying diodes;

a third mains branch for said converter;

a switch;

a third choke coil connected to said switch and to a third connection point between a third set of two rectifying diodes;

said switch having a first position that connects said third choke coil to said third mains branch for three-phase current conversion; and

,

said switch having for single-phase current conversion a second position that connects said third choke coil to a capacitor, said capacitor also connected to said second mains branch.

16. A converter system as claimed in claim 15, further comprising:

a respective switch connected antiparallel to each one of said rectifying diodes.

17. A converter system as claimed in claim 15, further comprising:

a two-pole inverter connected to said low end of said converter and to a high end of said converter;

a transformer primary side connected to said inverter; and

,

a transformer secondary side, said transformer secondary side connected to a two-pole rectifier configured for load connection.

18. A converter system for single-phase and three-phase operation comprising:

a converter;

a first mains branch for said converter;

said first mains branch connected at a point between a first set of two rectifying diodes in series;

a first choke coil in said first mains branch, said first choke coil located before said connection point to between said first set of two rectifying diodes;

a second mains branch for said converter;

said second mains branch connected at a second point between a second set of two rectifying diodes in series;

a second choke coil in said second mains branch, said second choke coil located before said connection second point to between said second set of two rectifying diodes;

a third mains branch for said converter;

two part-coils for said third mains branch;

a switch for said two part-coils of said third mains branch, said switch having a first position connecting said part-coils in parallel sense to said third mains branch for three-phase conversion operation, said first position also connecting said part-coils in parallel to a third point between a third set of two rectifying diodes in series; and

,

said switch having for single-phase operation a second position disconnecting said two part-coils from said third mains branch and connecting said two part-coils in series between said third point located between said third set of diodes and a capacitor connected to a low end of said converter.

19. A converter system as claimed in claim 18, further comprising:

a respective switch connected antiparallel to each one of said rectifying diodes.

20. The converter system as claimed in claim 18 wherein:

said two part-coils are coupled in the same sense with said first and second choke coils during three-phase operation, and during single-phase operation one of said part-coils is coupled in the same sense as said first and second choke coils while the second of said part-coils is coupled in the opposite sense to said first and second choke coils.

21. The converter system as claimed in claim 18 wherein:

said two part-coils each have the same number of turns as said first and second choke coils.

22. A converter system as claimed in claim 18, further comprising:

a first two-pole inverter connected to said converter;

a primary side of a first transformer connected to said first two-pole inverter;

a first two-pole rectifier, said first two-pole rectifier connected to a secondary side of said first transformer;

a second two-pole inverter connected to said converter;

a primary side of a second transformer connected to said second two-pole inverter; and

,

a second two-pole rectifier, said second two-pole rectifier connected to a secondary side of said second transformer.

23. A converter system as claimed in claim 22, further comprising:

a first inverter capacitor connected in parallel to said first two-pole inverter; and

,

a second inverter capacitor connected in parallel to said second two-pole inverter.

24. A converter system as claimed in claim 22, further comprising:

a first rectifier capacitor connected in parallel to said first two-pole rectifier; and

,

a second rectifier capacitor connected in parallel to said second two-pole rectifier.

25. The converter system as claimed in claim 22 wherein:

said first and second two-pole inverters are connected in parallel to said converter.

26. The converter system as claimed in claim 22 wherein:

said first and second two-pole inverters are connected in series to said converter.

27. The converter system as claimed in claim 22 wherein:

said rectifiers are connected in series.

28. The converter system as claimed in claim 22 wherein:

said rectifiers are connected in parallel.

29. A converter system as claimed in claim 22, further comprising:

a plurality of switches in said first and second inverters; and

,

antiparallel-connected rectifying diodes, respectively, for each one of said plurality of switches.

30. A converter system as claimed in claim 22, further comprising:

a plurality of rectifier-incorporated rectifying diodes in said first and second rectifiers; and

,

antiparallel-connected switches, respectively, for each one of said rectifier-incorporated rectifying diodes.

31. A converter system as claimed in claim 18, further comprising:

a first capacitor connected in parallel to said first set of two rectifying diodes;

a second capacitor connected in parallel to said second set of two rectifying diodes; and

,

a third capacitor connected in parallel to said third set of two rectifying diodes.