Power converter

• US 7,643,323 B2
• Filed: 10/03/2007
• Issued: 01/05/2010
• Est. Priority Date: 09/09/2003
• Status: Expired due to Fees

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Azuma, Katsunori, Kaneko, Takashi, Mishima, Akira, Konishide, Masaomi
• Primary Examiner(s): HAN, YOUNGHUIE JESSICA
• Application Number:
  US11/905,745
• Publication Number:
  US 20080212349A1
• Time in Patent Office: 825 Days
• Field of Search: 363/141, 363/144, 363/39, 323/205, 323/208, 307/89, 307/326, 307/327, 307/98, 307/105, 439/164, 174/562, 315/308
• US Class Current: 363/144
• CPC Class Codes: H02M 7/003 Constructional details, e.g. physical layout, assembly, wiring or busbar connections

Abstract

A power converter of the present invention is connected between a direct current power source and controls power to a load by switching equipment. The converter is equipped with a first conductor for connecting a negative pole of the power converter and the switching equipment, and a second conductor for connecting a housing of the power converter and the negative pole of the power converter to the first conductor through a resistor.

Claims

1. A power converter connected between a direct current power source and for controlling power to a load by switching equipment, comprising:

a first conductor for connecting a grounding conductor and said switching equipment; and

a second conductor with an associated resistor for connecting a housing of said power converter and a negative pole of said power converter to said first conductor, said second conductor abutting a busbar operatively connected with switching equipment and said grounding conductor.

2. A power converter connected between a direct current power source and for controlling power to a load by switching equipment, comprising:

a first conductor for connecting a grounding conductor and said switching equipment;

a second conductor with an associated resistor for connecting a housing of said power converter and the grounding conductor to said first conductor,

wherein said second conductor is arranged in abutting but isolated relationship with said first conductor.

3. A power converter according to claim 2, further comprising a filter condenser within a housing of a power converter, wherein said filter condenser is connected in parallel with a DC power source and switching equipment and suppresses a voltage fluctuation, with said second conductor being connected to a housing portion located adjacent to the filter condenser.

4. A power converter according to claim 2, further comprising cooling equipment for cooling said switching equipment, wherein said second conductor is connected to a portion of said housing located adjacent to said cooling equipment.

5. A power converter according to claim 2, further comprising a grounding switch at said first conductor, wherein said second conductor is connected to a housing of the power converter and a negative-pole-side portion of the grounding switch.

6. A power converter according to claim 2, wherein a plurality of conducting wires comprises said second conductor.

7. A power converter according to claim 2, wherein a conducting wire of a tape form comprises said second conductor and is arranged along said first conductor through an insulator.

8. A power converter according to claim 7, wherein said second conductor of a tape form is spirally wound on said first conductor.

9. A power converter connected between a direct current power source and for controlling power to a load by switching equipment, comprising:

a first conductor for connecting a grounding conductor and said switching equipment;

a second conductor with an associated resistor for connecting a housing of said power converter and said grounding conductor to said first conductor,

wherein the second conductor is arranged adjacent to the first conductor so that a parasitic inductance of the second conductor couples a parasitic inductance of the first conductor.

10. A power converter according to claim 9, wherein high-frequency current is recoverable through said second conductor, the high-frequency current leaking to a housing of the power converter through a parasitic capacitance of a filter condenser provided within the housing.

11. A power converter according to claim 9, wherein an inductance of a path of a high-frequency current flowing in said first conductor and said second conductor is not more than a half of an inductance of a path of another high-frequency current flowing the first conductor and a housing.