Charge and discharge system for electric power storage equipment

• US 6,297,616 B1
• Filed: 01/18/2000
• Issued: 10/02/2001
• Est. Priority Date: 01/18/1999
• Status: Expired due to Fees

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Nomura, Takahiro, Emori, Akihiko, Miyazaki, Hideki, Kubo, Kenji, Tokunaga, Norikazu
• Primary Examiner(s): Tso, Edward H.
• Application Number:
  US09/484,524
• Time in Patent Office: 623 Days
• Field of Search: 320/116, 320/119, 320/121, 320/122, 320/138
• US Class Current: 320/116
• CPC Class Codes: B60L 2210/30 AC to DC converters
• CPC Class Codes: B60L 2210/40 DC to AC converters
• CPC Class Codes: B60L 53/122 Circuits or methods for driving the primary coil, e.g. supplying electric power to the coil
• CPC Class Codes: B60L 53/22 Constructional details or arrangements of charging converters specially adapted for charging electric vehicles
• CPC Class Codes: B60L 58/20 having different nominal voltages
• CPC Class Codes: B60L 58/21 having the same nominal voltage
• CPC Class Codes: H02J 2207/20 Charging or discharging characterised by the power electronics converter
• CPC Class Codes: H02J 7/0016 using shunting, discharge or bypass circuits
• CPC Class Codes: H02M 3/33561 having more than one ouput with independent control
• CPC Class Codes: H02M 3/33576 having at least one active switching element at the secondary side of an isolation transformer
• CPC Class Codes: H02M 3/33584 Bidirectional converters
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility
• CPC Class Codes: Y02T 10/92 Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles
• CPC Class Codes: Y02T 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles

Abstract

A charge and discharge apparatus for electric power storage means has an AC power source, a transforming apparatus, which comprises a primary winding connected to the AC power source, and plural secondary windings, and plural electric power converters comprising plural AC sides, respective ones of which are connected to a respective one of the plural secondary windings, and plural DC sides, respective ones of which are connected to a respective one of the plural electric power storage means.

Claims

1. A charge and discharge apparatus for electric power storage means comprising:

an AC power source;

a transforming apparatus, which comprises a primary winding connected to said AC power source, and plural secondary windings; and

plural electric power converters comprising plural AC sides to be connected to said plural secondary windings, and plural DC sides to be connected to plural electric power storage means;

wherein said AC power source comprises an electric power converting portion to be connected to said primary winding; and

wherein said electric power converting portion is controlled so that the current flown to said primary winding becomes a current reference.

2. A charge and discharge apparatus for electric power storage means as claimed in claim 1, wherein said transforming apparatus is composed by connecting primary windings of plural transformers in series.

3. A charge and discharge apparatus for electric power storage means comprising:

an AC power source;

a transforming apparatus, which comprises a primary winding connected to said AC power source, and plural secondary windings; and

plural electric power converters comprising plural AC sides to be connected to said plural secondary windings, and plural DC sides to be connected to plural electric power storage means;

wherein said AC power source comprises an electric power converting portion to be connected to said primary winding;

wherein said transforming apparatus comprises plural transformers, said primary winding is composed by connecting primary side windings of said plural transformers in parallel, and said secondary winding is composed of plural secondary windings of said plural transformers; and

wherein said plural electric power converters comprise;

plural electric power converting circuits including said plural AC sides, and plural chopper circuits including said plural DC sides.

4. A charge and discharge apparatus for electric power storage means as claimed in claim 3, wherein

at least one of said plural electric power converting circuits is connected to at least two of said plural chopper circuits.

5. A charge and discharge apparatus for electric power storage means comprising:

an AC power source;

a transforming apparatus, which comprises a primary winding connected to said AC power source, and plural secondary windings;

plural electric power converters comprising plural AC sides to be connected to said plural secondary windings, and plural DC sides; and

terminals to be connected to the electric power storage means, to which both ends of the series connection of said plural DC sides are connected;

wherein an output voltage of at least one of said plural electric power converters is constant, and an output voltage of at least an other one of said plural electric power converters is variable.

6. A charge and discharge apparatus for electric power storage means comprising:

an AC power source;

a first AC/DC power converting means connected to said AC power source;

a second AC/DC power converting means connected to a DC output of said first AC/DC power converting means;

primary windings of plural transformers being connected in series to AC output terminals of said first AC/DC power converting means;

each of secondary windings of said plural transformers being provided with a rectifier;

each of outputs of said rectifiers being connected to said electric power storage means via a first switching means; and

each of the outputs of said rectifiers being provided with a second switching means for effecting a short circuit of the output of said rectifiers.

7. A charge and discharge apparatus for electric power storage means as claimed in claim 6, wherein each of said first AC/DC power converting means and said second AC/DC power converting means is a bidirectional electric power converting means enabling conversion of AC to DC, and DC to AC, and full bridge converters having a bidirectional electric power converting function are composed by integrating said rectifiers connected to each of said plural secondary windings, said first switching means, and said secondary switching means.

8. A charge and discharge apparatus for electric power storage means as claimed in any one of claims 6 and 7, wherein said second AC/DC power converting means is provided with a first control means for controlling a current flowing in the primary windings of said transformer to be a designated amperage.

9. A charge and discharge apparatus for electric power storage means as claimed in claim 8, further comprising a second control means to isolate charging or discharging of at least one of plural electric power storage means by one of turning off each of said first switching means provided at secondary side of said plural transformers and turning off each of switching elements composing each of said full bridge converters.

11. A charge and discharge apparatus for electric power storage means as claimed in claim 7, wherein said full bridge converters connected to each of plural secondary windings are controlled to operate synchronously with each other than when charge or discharge to said electric power storage means is isolated.

10. A charge and discharge apparatus for electric power storage means as claimed in 9, wherein said control means makes a current flowing in the secondary winding of the transformer bypass by one of turning off each of said first switching means and turning off each of one side of switching elements of said full bridge converters, and concurrently, by one of turning on said second switching means connected to the secondary side of the same transformer and turning on each of an other side of switching elements of said full bridge converters.

12. A charge and discharge apparatus for electric power storage means comprising:

an AC power source;

a first AC/DC bidirectional power converting means connected to said AC power source; and

a second AC/DC bidirectional power converting means connected to a DC output of said first AC/DC bidirectional power converting means;

an electric power supply bus wire connected to an AC output terminal of said second AC/DC bidirectional power converting means, and concurrently, primary windings of plural transformers are connected in parallel to said electric power supply bus wire;

each of secondary windings of said plural transformers is provided with a third AC/DC bidirectional power converting means; and

each of outputs of said third AC/DC bidirectional power converting means is connected to said electric power storage means via a first switching means.

13. A charge and discharge apparatus for electric power storage means as claimed in any one of claims 7 and 12, wherein a DC voltage converted by said full bridge converters and said third AC/DC bidirectional power converting means is connected to a second electric power supply bus wire, and concurrently, plural electric power storage means are connected to said second electric power supply bus wire via plural step-up/step-down converting means.