DC/DC converter and AC/DC converter

• US 8,009,443 B2
• Filed: 05/18/2010
• Issued: 08/30/2011
• Est. Priority Date: 01/29/2009
• Status: Active Grant

• Current Assignee: Brusa Hypower AG
• Original Assignee: BRUSA Elektronik AG
• Inventors: Krause, Axel
• Primary Examiner(s): Berhane; Adolf
• Assistant Examiner(s): Zhang; Jue
• Application Number:
  US12/782,001
• Publication Number:
  US 20100220501A1
• Time in Patent Office: 469 Days
• Field of Search: 363/17, 363/71, 363/98, 363/132
• 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 DC/DC converter (1) having a plurality n of two-pole inverters (2a, 2b) connected in parallel or in series, n transformers (T_a, T_b) and n two-pole rectifiers (3a, 3b) connected in parallel or in series is described. One inverter (2a, 2b) each and one rectifier (3a, 3b) each are connected to a transformer (T_a, T_b). The inverters (2a, 2b, 2a′, 2b′) are in turn connected to a control which is provided for frequency-synchronous actuation of the inverters (2a, 2b, 2a′, 2b′) with a 180°/n phase shift. According to the invention, leakage inductances (L_S1, L_S2) of the transformers (T_a, T_b, T_a′, T_b′), together with capacitors (C₁, C₂) of the inverters (2a, 2b , 2a′, 2b′) and/or capacitors (C₃, C₄) of the rectifiers (3a, 3b, 3a′, 3b′), form in each case a resonating circuit whose resonant frequency is substantially twice as great as a clock frequency of the control signal. Furthermore, an AC/DC converter (6) is described which has a DC/DC converter (1) according to the invention with an AC/DC stage (5) connected on the input side.

Claims

1. A DC-to-DC converter comprising:

a first two-pole inverter;

a second two-pole inverter connected to said first inverter;

a first transformer, said first transformer having a first transformer primary side connected to said first inverter, and said first transformer having a first transformer secondary side;

a second transformer, said second transformer having a second transformer primary side connected to said second inverter, and said second transformer having a second transformer secondary side;

a first two-pole rectifier connected to said second transformer primary side;

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

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

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

a third capacitor connected in parallel to said first rectifier; and

,

a control configured to provide a control signal for frequency-synchronous actuation with a ninety-degree phase shift of said first and second two-pole inverters, so that leakage inductances of said first and second transformers together with said capacitors form resonating circuits having resonant frequency substantially twice as great as a clock frequency of said control signal.

2. The DC-to-DC converter as claimed in claim 1 wherein:

said second two-pole inverter is connected to said first inverter in series.

3. The DC-to-DC converter as claimed in claim 2 wherein:

said second two-pole rectifier is connected to said first rectifier in parallel.

4. A DC-to-DC converter as claimed in claim 1 further comprising:

a fourth capacitor connected in parallel to said second rectifier.

5. A DC-to-DC converter as claimed in claim 4 further comprising:

said third capacitor is connected to a center tap of said first transformer; and

,

said fourth capacitor is connected to a center tap of said second transformer.

6. The DC-to-DC converter as claimed in claim 1 wherein:

said control signal is a square-wave signal.

7. A DC-to-DC converter as claimed in claim 1 further comprising:

said first transformer and said second transformer have separated cores.

8. A DC-to-DC converter as claimed in claim 1 further comprising:

a first switching element in said first two-pole inverter;

a first rectifying element connected antiparallel to said first switching element;

a second switching element in said second two-pole inverter;

a second rectifying element connected antiparallel to said second switching element;

a third rectifying element in said first two-pole rectifier;

a third switching element connected antiparallel to said third rectifying element;

a fourth rectifying element in said second two-pole rectifier; and

,

a fourth switching element connected antiparallel to said fourth rectifying element.

9. The DC-to-DC converter as claimed in claim 1 wherein:

said third capacitor is also connected in parallel to said second rectifier.

10. A DC-to-DC converter as claimed in claim 1 further comprising:

a change-over switch configured to selectively connect said first and second two-pole inverters in either a series configuration or a parallel configuration;

a first coil;

a second coil; and

,

said first and second coils connected between said first and second two-pole inverters when said change-over switch connects in the parallel configuration.

11. The DC-to-DC converter as claimed in claim 10 wherein:

said first and second coils are coupled.

12. A DC-to-DC converter comprising:

a plurality of two-pole inverters, said plurality corresponding to an integer n, said plurality of two-pole inverters being mutually interconnected in one of either a series configuration or a parallel configuration;

a plurality n of two-pole rectifiers, said plurality of two-pole rectifiers being mutually interconnected in one of either a series configuration or a parallel configuration;

a plurality of respective transformers, each transformer having one respective primary side connected to a respective one of said plurality of two-pole inverters, each transformer having one respective secondary side connected to a respective one of said plurality of two-pole rectifiers;

at least one capacitor connected in parallel with at least one of said plurality of two-pole inverters; and

,

a control configured to provide a control signal for frequency-synchronous actuation with a 180°

/n phase shift of said plurality of two-pole inverters, so that leakage inductances of said plurality of transformers together with said at least one capacitor form a resonating circuit having resonant frequency substantially twice as great as a clock frequency of said control signal.

13. A DC-to-DC converter as claimed in claim 12 further comprising:

a first plurality of capacitors, each respectively connected in parallel with a respective one of said plurality of two-pole inverters.

14. A DC-to-DC converter as claimed in claim 13 further comprising:

a second plurality of capacitors, each respectively connected in parallel with a respective one of said plurality of two-pole rectifiers.

15. A DC-to-DC converter as claimed in claim 12 further comprising:

at least one capacitor connected in parallel with at least one of said plurality of two-pole rectifiers.

16. A DC-to-DC converter as claimed in claim 12 further comprising:

said plurality of inverters have, each respectively, one inverter switching element, and one inverter rectifying element connected in antiparallel to the respective inverter switching element; and

,

said plurality of rectifiers have, each respectively, one rectifier rectifying element, and one rectifier switching element connected in antiparallel to the respective rectifier rectifying element.

17. A DC-to-DC converter comprising:

a plurality of two-pole inverters, said plurality corresponding to an integer n, said plurality of two-pole inverters being mutually interconnected in one of either a series configuration or a parallel configuration;

a plurality n of two-pole rectifiers, said plurality of two-pole rectifiers being mutually interconnected in one of either a series configuration or a parallel configuration;

a plurality of respective transformers, each transformer having one respective primary side connected to a respective one of said plurality of two-pole inverters, each transformer having one respective secondary side connected to a respective one of said plurality of two-pole rectifiers;

at least one capacitor connected in parallel with at least one of said plurality of two-pole rectifiers; and

,

a control configured to provide a control signal for frequency-synchronous actuation with a 180°

/n phase shift of said plurality of two-pole inverters, so that leakage inductances of said plurality of transformers together with said at least one capacitor form a resonating circuit having resonant frequency substantially twice as great as a clock frequency of said control signal.

18. A DC-to-DC converter as claimed in claim 17 further comprising:

a first plurality of capacitors, each respectively connected in parallel with a respective one of said plurality of two-pole rectifiers.

19. A DC-to-DC converter as claimed in claim 18 further comprising:

a second plurality of capacitors, each respectively connected in parallel with a respective one of said plurality of two-pole inverters.

20. A DC-to-DC converter as claimed in claim 17 further comprising:

at least one capacitor connected in parallel with at least one of said plurality of two-pole inverters.