POWER CONVERSION EQUIPMENT

• US 20110025236A1
• Filed: 07/27/2010
• Published: 02/03/2011
• Est. Priority Date: 07/31/2009
• Status: Active Grant

• Current Assignee: Fuji Electric Company Limited (Fuji Electric Systems Company Limited)
• Original Assignee: Fuji Electric Company Limited (Fuji Electric Systems Company Limited)
• Inventors: Takizawa, Satoki
• Granted Patent: US 8,344,677 B2
• Time in Patent Office: Days
• US Class Current: 318/139
• CPC Class Codes: H02M 1/32 Means for protecting converters other than automatic disconnection
• CPC Class Codes: H02M 5/4585 having a rectifier with controlled elements
• CPC Class Codes: H02P 29/02 Providing protection against overload without automatic interruption of supply protection against faults of stepper motors H02P8/36

Abstract

Power conversion equipment includes an electric power converting section that converts DC electric power to multiphase AC electric power and feeds the converted multiphase AC electric power to a multiphase AC motor. A first short-circuit section includes a first switch disposed between a first DC power supply and the electric power converting section. A second short-circuit section includes a second switch disposed between at least one of an electric power feeding section and the electric power input section in the first DC power supply, or between a multiphase AC output point of the electric power converting section and the multiphase AC motor. A switch control section controls the first switch and the second switch such that the first and second switches are prevented from being brought into the closed-state simultaneously.

Claims

1. Power conversion equipment comprising:

a first DC power supply, the first DC power supply comprising

an electric power feeding section,

an electric power input section, for receiving electric power fed from

the electric power feeding section, and

a DC electric power converting section for converting the electric power fed to the electric power input section to DC electric power;

a second DC power supply comprising a capacitor connected in parallel to the first DC power supply;

a smoothing circuit section for smoothing the DC electric power fed from the first DC power supply and DC electric power fed from the second DC power supply;

an electric power converting section connected to the smoothing circuit section, the electric power converting section for converting the DC electric power to multiphase AC electric power and feeding the converted multiphase AC electric power to a multiphase AC motor;

a first short-circuit section comprising a first switch inserted therein, the first switch being disposed between a multiphase AC output point of the electric power input section in the first DC power supply and a multiphase AC output point of the electric power converting section;

a second short-circuit section comprising a second switch inserted therein, the second switch being disposed between at least one of the electric power feeding section and the electric power input section in the first DC power supply or the multiphase AC output point of the electric power converting section and the multiphase AC motor; and

a switch control section, the switch control section for controlling the first switch and the second switch for preventing the first switch and the second switch from being closed simultaneously.

2. The power conversion equipment according to claim 1, wherein the electric power feeding section in the first DC power supply comprises a multiphase AC generator and the DC electric power converting section in the first DC power supply comprises a multiphase AC-DC converter circuit.

3. The power conversion equipment according to claim 2, wherein the multiphase AC generator is driven by an internal combustion engine.

4. The power conversion equipment according to claim 1, wherein the electric power feeding section in the first DC power supply comprises a battery and the DC electric power converting section in the first DC power supply comprises a boost circuit.

5. The power conversion equipment according to claim 1, wherein the DC electric power converting section in the first DC power supply comprises a switching arm comprising a switching device and a diode connected in opposite parallel to each other.

6. The power conversion equipment according to claim 1, wherein the electric power converting section comprises a switching arm comprising a switching device and a diode connected in opposite parallel to each other.

7. Power conversion equipment comprising:

at least one DC power supply including an electric power feeding section and an electric power input section;

an electric power converting section connected to the at least one DC power supply, for converting DC electric power output by the at least one DC power supply to multiphase AC electric power;

a first switch disposed between a multiphase AC output point of the at least one DC power supply and a multiphase AC output point of the electric power converting section;

a second switch disposed between the electric power feeding section and the electric power input section in the at least one DC power supply; and

a switch control section for controlling the first switch and the second switch, to prevent the first switch and the second switch from being closed simultaneously.

8. The power conversion equipment of claim 7, further comprising:

a smoothing circuit section for smoothing DC electric power output from the at least one DC power supply.

9. The power conversion equipment of claim 8, further comprising:

another DC power supply connected to the smoothing circuit section and the at least one DC power supply.

10. Power conversion equipment comprising:

at least one DC power supply including an electric power feeding section and an electric power input section;

an electric power converting section connected to the at least one DC power supply, for converting DC electric power output by the at least one DC power supply to multiphase AC electric power;

a first switch disposed between a multiphase AC output point of the at least one DC power supply and a multiphase AC output point of the electric power converting section;

a second switch disposed between the multiphase AC output point of the electric power converting section and a multiphase AC motor; and

a switch control section for controlling the first switch and the second switch, to prevent the first switch and the second switch from being closed simultaneously.

11. The power conversion equipment of claim 10, further comprising:

a smoothing circuit section for smoothing DC electric power output from the at least one DC power supply.

12. The power conversion equipment of claim 11, further comprising:

another DC power supply connected to the smoothing circuit section and the at least one DC power supply.