DC/DC converter and AC/DC converter
A DC/DC converter ( 1 ) having a plurality n of two-pole inverters ( 2 a, 2 b ) connected in parallel or in series, n transformers (T a , T b ) and n two-pole rectifiers ( 3 a, 3 b ) connected in parallel or in series is described. One inverter ( 2 a, 2 b ) each and one rectifier ( 3 a, 3 b ) each are connected to a transformer (T a , T b ). The inverters ( 2 a, 2 b, 2 a′, 2 b ′) are in turn connected to a control which is provided for frequency-synchronous actuation of the inverters ( 2 a, 2 b, 2 a′, 2 b ′) 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 (C 1 , C 2 ) of the inverters ( 2 a, 2 b , 2 a ′, 2 b ′) and/or capacitors (C 3 , C 4 ) of the rectifiers ( 3 a, 3 b, 3 a ′, 3 b ′), 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.
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.