Device for feeding a charge including integrated energy storage

• US 20100007209A1
• Filed: 12/16/2008
• Published: 01/14/2010
• Est. Priority Date: 06/16/2006
• Status: Active Grant

• Current Assignee: European Organization for Nuclear Research, Ecole polytechnique fãdãrale de lausanne epfl (Schweizerische Eidgenossenschaft)
• Original Assignee: European Organization for Nuclear Research, Ecole polytechnique fãdãrale de lausanne epfl (Schweizerische Eidgenossenschaft)
• Inventors: Schill, Jurgen, Kreiensen, Ullrich, Eppler, Willi
• Granted Patent: US 8,723,365 B2
• Time in Patent Office: Days
• US Class Current: 307/36
• CPC Class Codes: H02J 7/345 using capacitors as storage or buffering devices
• CPC Class Codes: H02M 3/1555 for the generation of a regulated current to a load whose impedance is substantially inductive
• CPC Class Codes: H02M 3/158 including plural semiconductor devices as final control devices for a single load
• CPC Class Codes: H02M 7/217 using semiconductor devices only

Abstract

A device for supplying power to a load, requiring both a pre-determined supply of electrical power and high power for short durations of the operating cycle of the load, where the operating cycle is repeated. The power supply device includes a connection to an electrical grid, an AC voltage transformation circuit, a voltage rectification means and a plurality of DC/DC converters mounted in series to terminals of the load. Each of the DC/DC converters has a storage capacitor mounted in parallel to it and at least one of the DC/DC converters is supplied directly by the voltage rectification means. At least another one of the DC/DC converters is not supplied directly by the voltage rectification means. The power supply device may compensate for losses in the power supply device and load, and may substantially continually and uniformly balance voltages at terminals of the storage capacitors.

Claims

1. A device for supplying power to a load requiring both a pre-determined supply of electrical power and high power for short durations of the operating cycle of the load, where the operating cycle is repeated, the power supply device comprising:

connection to an electrical grid;

an AC voltage transformation circuit;

a voltage rectification means; and

a plurality of DC/DC converters mounted in series to terminals of said load, wherein each of said DC/DC converters has a storage capacitor mounted in parallel to it, and wherein at least one of said DC/DC converters is supplied directly by said voltage rectification means, and wherein at least another one of said DC/DC converters is not supplied directly by said voltage rectification means.

2. A power supply device according to claim 1, wherein said rectification means comprises at least one rectifier cell comprising six-diodes mounted in a bridge assembly and one a smoothing choke mounted in series at a positive DC output of said rectification means.

3. A power supply device as per claim 1, wherein said rectification means comprises at least one rectifier cell comprising six-thyristors mounted in a bridge assembly and a smoothing choke mounted in series at a positive DC output of said rectification means.

4. A power supply device as per claim 1, wherein said rectification means comprises at least one pulse rectifier cell comprising six controllable semiconductor components, GTO or IGCT-type thyristors or IGBT-type transistors, wherein each of said controllable semiconductor components comprises a diode in anti-parallel connection;

and a decoupling inductance mounted at each AC input of said rectification means.

5. A power supply device as per claim 1, wherein one of said DC/DC converters comprises:

a reversible chopper circuit comprising two branches with each branch comprising one or more diodes mounted in series and one or more switchable semiconductor elements mounted in series and in anti-parallel connection to said one or more diodes; and

said storage capacitor mounted on terminals of said branches.

6. A power supply device as per claim 1, wherein one of said DC/DC converters comprises a reversible chopper circuit comprising two branches wherein each branch comprises one or more branches of two-level or three-level inverters.

7. A power supply device as per claim 1, wherein said DC/DC converter directly supplied by said rectification means is controlled by a modulator which provides a power adjustment thereby ensuring that said DC/DC converters supply power required to compensate for losses in said power supply device and in said load.

8. A power supply device as per claim 7, wherein said modulator supplies a control signal (S_k) to switchable semiconductor elements of said DC/DC converter, wherein said control signal is supplied by a discriminator having an input signal coming from mean voltage (U_moy) measurement signals which are measured immediately prior to an energy delivery cycle in each of said storage capacitors.

9. A power supply device as per claim 1, wherein said at least one DC/DC converter not directly supplied by said rectification means is controlled by a modulator which provides a current adjustment to thereby ensure that voltages at terminals of said storage capacitors are substantially continually and uniformly balanced.

10. A power supply device as per claim 9, wherein said modulator supplies a control signal (S_k) to switchable semiconductor elements of said at least one DC/DC converter not supplied directly by said rectification means wherein said control signal is supplied by a discriminator having an input signal obtained from voltage measurement signals which measure voltages at said terminals of all of said storage capacitors.

11. A power supply device as per claim 10, wherein said control signals (S_k) of said at least one DC/DC converters not supplied directly by said rectification means are staggered with respect to one another in order to stagger the voltages generated by said at least one DC/DC converters not supplied directly by said rectification means so that a voltage supplied to said load has a reduced ripple.

12. A power supply device in accordance with claim 2 wherein each of said plural DC/DC converters comprises a reversible chopper circuit comprising two branches with each branch comprising one or more diodes mounted in series and one or more switchable semiconductor elements mounted in series and in anti-parallel connection to said one or more diodes, and wherein said storage capacitor is mounted on terminals of said branches.

13. A power supply device in accordance with claim 12 wherein said at least one DC/DC converter directly supplied by said rectification means further comprises a modulator which provides a power adjustment signal to said at least one DC/DC converter directly supplied by said rectification means to thereby compensate for losses in said power supply device and in said load.

14. A power supply device in accordance with claim 13 wherein said at least one DC/DC converter not directly supplied by said rectification means further comprises a modulator which provides a current adjustment signal to thereby substantially continually and uniformly balance voltages at terminals of said storage capacitors.

15. A power supply device in accordance with claim 14 wherein said current adjustment signals are staggered with respect to one another in order to stagger voltages generated by said at least one DC/DC converters not supplied directly by said rectification means so that a voltage supplied to said load has a reduced ripple.

16. A power supply device in accordance with claim 2 wherein each of said plural DC/DC converters comprises a reversible chopper circuit comprising two branches wherein each branch comprises one or more branches of two-level or three-level inverters.

17. A power supply device in accordance with claim 16 wherein said at least one DC/DC converter directly supplied by said rectification means further comprises a modulator which provides a power adjustment signal to said at least one DC/DC converter directly supplied by said rectification means to thereby compensate for losses in said power supply device and in said load.

18. A power supply device in accordance with claim 17 wherein said at least one DC/DC converter not directly supplied by said rectification means further comprises a modulator which provides a current adjustment signal to thereby substantially continually and uniformly balance voltages at terminals of said storage capacitors.

19. A power supply device in accordance with claim 18 wherein said current adjustment signals are staggered with respect to one another in order to stagger voltages generated by said at least one DC/DC converters not supplied directly by said rectification means so that a voltage supplied to said load has a reduced ripple.

20. A device for supplying power to a load requiring both a pre-determined supply of electrical power and high power for short durations of the operating cycle of the load, where the operating cycle is repeated, the power supply device comprising:

a connection to an electrical grid;

an AC voltage transformation circuit;

a voltage rectification means, wherein said rectification means comprises at least one pulse rectifier cell comprising six controllable semiconductor components, GTO or IGCT-type thyristors or IGBT-type transistors, wherein each of said controllable semiconductor components comprises a diode in anti-parallel connection, and a decoupling inductance mounted at each AC input of said rectification means; and

a plurality of DC/DC converters mounted in series to terminals of said load, said DC/DC converters each comprise a reversible chopper circuit comprising two branches with each branch comprising one or more diodes mounted in series and one or more switchable semiconductor elements mounted in series and in anti-parallel connection to said one or more diodes; and

a storage capacitor mounted on terminals of said branches;

wherein at least one of said DC/DC converters is supplied directly by said voltage rectification means and at least another one of said DC/DC converters is not supplied directly by said voltage rectification means,

and wherein said at least one DC/DC converter directly supplied by said rectification means further comprises a modulator which provides a power adjustment signal to said at least one DC/DC converter directly supplied by said rectification means to thereby compensate for losses in said power supply device and in said load,

and wherein said at least one DC/DC converter not directly supplied by said rectification means further comprises a modulator which provides a current adjustment signal to thereby substantially continually and uniformly balance voltages at terminals of said storage capacitors,

and wherein said current adjustment signals are staggered with respect to one another in order to stagger voltages generated by said at least one DC/DC converters not supplied directly by said rectification means so that a voltage supplied to said load has a reduced ripple.