Electric bus arrangement and method for minimizing the inductance in an electric bus arrangement

• US 6,259,617 B1
• Filed: 03/21/2000
• Issued: 07/10/2001
• Est. Priority Date: 07/28/1997
• Status: Expired due to Term

• Current Assignee: Danfoss Drives A/S (Danfoss A/S)
• Original Assignee: Danfoss A/S
• Inventors: Wu, Jian Mu
• Primary Examiner(s): HAN, YOUNGHUIE JESSICA
• Application Number:
  US09/446,829
• Time in Patent Office: 476 Days
• Field of Search: 363/50, 363/55, 363/56, 363/132, 363/141, 363/144, 361/707, 257/687, 257/724
• US Class Current: 363/144
• CPC Class Codes: H02M 7/003 Constructional details, e.g. physical layout, assembly, wiring or busbar connections

Abstract

Electric bus arrangement (1) for DC-supply of power components, particularly for an inverter, having a first and a second plate (2, 3), arranged in parallel with each other, separated by an isolating layer (4), by which the first plate (2) connects first connections of power components (13) of a first group with first connections (23) of power components (14) of a second group, and the second plate (3) connects second connections of the power components (13) of the first group with second connections of the power components (14) of the second group. In such a bus arrangement an increase of the switching frequency is desired, however without the risk of damaging components due to overvoltage. For this purpose, the first and the second plates (2,3) are branching in the area of the circuit components (14) of the second group into connection extensions (15, 16), which are directed in different directions, and from the meeting point (17) of the connection extensions (15, 16) the first and the second plates are arranged in parallel.

Claims

1. Electric bus arrangement for DC-supply of power components, the bus arrangement having a first plate and a second plate arranged in parallel with each other and being separated by an isolating layer, the first plate connecting first connections of power components of a first group with first connections of power components of a second group, and the second plate connecting second connections of the power components of the first group with second connections of the power components of the second group, and in an area of the power components of the second group, the first and the second plates branching into connection extensions each directed in a different direction, and from a meeting point of the connection extensions, the first and the second plates being arranged in parallel, and in which the power components of the first group are arranged on the plates.

2. Bus arrangement according to claim 1, in which the connection extensions are located in a plane which is not parallel to the plane to which the plates are parallel.

3. Bus arrangement according to claim 2, in which the connection extensions are arranged at an angle of 90°

in relation to the plates.

4. Bus arrangement according to claim 1, in which the connection extensions have the same length.

5. Bus arrangement according to claim 1, in which both plates are the same distance from the first connections and the second connections of the power components of the second group.

6. Bus arrangement according to claim 1, in which the power components of the first group are arranged perpendicular to the plates.

7. Bus arrangement according to claim 1, in which the second plate is divided into two plate parts arranged in the same plane.

8. Bus arrangement according to claim 7, in which the plate part not having the connection extension has a voltage potential which is approximately midway between the potentials of the first and the second connections.

9. Electric bus arrangement for DC-supply of power components, the bus arrangement having a first and a second plate arranged in parallel with each other separated by an isolating layer, the first plate connecting first connections of power components of a first group with first connections of power components of a second group, and the second plate connecting second connections of the power components of the first group with second connections of the power components of the second group, the first plate having several first conductor areas and the second plate having a corresponding number of second conductor areas, the first conductor areas connecting the first connections of the power components of the second group with each other or with a first power supply connection, and the second conductor areas connecting the second connections of the power components of the second group with each other or with a second power supply connection, and first and second corresponding conductor areas being arranged to cover each other, so that when the power components are operated, the sum of currents in the first and second corresponding conductor areas is the same before and after a switching operation.

10. Bus arrangement according to claim 9, in which the connection extensions are arranged opposite each other.

11. Method for minimizing the inductance in an electric bus arrangement for DC-supply of switching power components including two plates, comprising the current in a first plate of the bus arrangement flowing in one direction and the current in a second plate of the bus arrangement, parallel to and arranged very close to the first plate, flowing in the opposite direction, and the sum of currents in areas of the two plates overlapping each other before switching being kept equal to the sum of currents in the overlapping areas after switching.

12. Method according to claim 11, in which an auxiliary current is used to keep the sums of the currents equal to each other, which auxiliary current flows through a freewheeling diode of a second switch in a switch branch.