JPH08214561A - Power converter for mounting on vehicle - Google Patents

Abstract

PURPOSE: To deal with a power converter for mounting on vehicles, by shortening its wiring lengths and reducing its wiring inductances, and by making small- sized snubber circuits of a low cost usable. CONSTITUTION: One side 18a of the base surfaces of a heat-pipe is provided with the constituent elements of the one-phase portion of a power converter wherein switching elements 1-4 and bodies 5, 6 are included. Thereby, the wiring lengths thereof are made short as much as possible.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle-mounted power conversion device mounted and used under the floor of a vehicle.

[0002]

2. Description of the Related Art An example of a circuit for one phase of a three-level power converter is shown in FIG. 3 and an example of its configuration is shown in FIG. Note that FIG.
(A) is a perspective view of the three-level power converter viewed obliquely from the upper left, and (B) is a perspective view similarly viewed from the upper right. Three
As shown in FIG. 3, for example, one phase of the level power conversion device is composed of switching elements 1 to 4 and clamping diodes 5 and 6, and in addition to the two levels of the first and second levels, the intermediate The third level output is possible and the output voltage waveform distortion is small, so that it has been widely used recently. The switching elements 1 to 4 use insulated gate bipolar transistors (IGBTs) here. Reference numeral 7 is a filter capacitor provided for each phase, and 8 to 17 are wiring conductors.

Conventionally, since the number of elements in the three-level power conversion device is larger than that in the two-level power conversion apparatus, as shown in FIG. Two switching elements and one diode) are arranged, and as shown in FIG. 4B, one arm is mounted on the second surface of the heat pipe base surface, and one phase element is mounted on both surfaces. I am trying. In addition, in a vehicle-mounted inverter, four inverters may be housed in one housing. In such a case, 12 inverters (4 × 3 phase) having the configuration shown in FIG. 4 are used. You will need it.

[0004]

In the above-mentioned conventional example, as shown in FIG. 4, a pair of upper and lower arm elements (upper arm elements 1, 2 and 5 and lower arm element 3). , 4 and 6) straddle both sides of the base surface of the heat pipe, so the wiring length for connecting the arms (see FIG. 4).
In the example, the lengths of 10, 11, 12 and 13, 14, 15 are long. As a result, the inductance of the wiring passing through that path increases, and the surge voltage generated also increases.

Therefore, conventionally, the snubber circuit which absorbs the surge has a large capacity to cope with the problem, and there is a problem that the snubber circuit becomes large and the cost becomes high. Further, in the related art, one heat pipe accommodates one-phase switching elements, so the unit configuration is one-phase unit, and in a power conversion device mounted on a vehicle, a plurality of power conversion devices are included in one housing. It is often stored, and in such a case, there is a problem that the number of units increases and the device becomes large. Therefore, an object of the present invention is to eliminate the above-mentioned adverse effects caused by the inductance of the wiring of the power converter,
It is to reduce costs.

[0006]

In order to solve such a problem, according to the invention of claim 1, one side of the base surface of the heat pipe is composed of an insulating switching element and a diode, and performs three-level operation. It is characterized in that constituent elements for one phase of the vehicle-mounted power conversion device are arranged. According to the second aspect of the present invention, the components for one phase of the vehicle-mounted power conversion device, each of which is composed of an insulating switching element and a diode and which performs three-level operation, are arranged on both sides of the base surface of the heat pipe. It is characterized by that.

[0007]

By configuring the switching element and the clamping diode for one phase only on one side of the base surface of the heat pipe, the factor that restricts the wiring length between the respective elements is eliminated and the shortest configuration is achieved. The inductance of the wiring is reduced, the snubber circuit is downsized, and the wiring structure is simplified. Further, by mounting the two-phase constituent elements on both sides of one heat pipe to form one unit, the number of units mounted in the vehicle is reduced, and the size and cost are reduced.

[0008]

1 is a block diagram showing an embodiment of the present invention. In the figure, 18a is a base surface of a heat pipe for mounting a switching element, and 1-4 are IGBs.
T, 5 and 6 are clamping diodes, and 7 is a filter capacitor provided in each phase. The wiring conductors 8 and 9 have the same role as the wiring conductors 8 and 9 in FIG. 4, and are connected to the P (positive electrode) terminal and the N (negative electrode) terminal of the filter capacitor provided in each phase. The wiring conductors 16 and 17 have the same role as the wiring conductors 16 and 17 of FIG. 4, and connect these to the arm elements (1, 2, 5 and 3, 4, 6) of one phase.

Reference numeral 19 is a wiring conductor corresponding to the wiring conductors 10, 11, and 12 in FIG. 4, and connects the upper and lower arms of one phase (diodes 5 and 6) with a short wiring length. Further, 20 is a wiring conductor corresponding to the wiring conductors 13, 14, 15 in FIG.
The upper and lower arms of one phase (IGBTs 2 and 3) are connected with a short wiring length. Thus, the diodes 5, 6 and I
Since the GBTs 2 and 3 are connected with short wiring lengths, respectively, the wiring inductance can be reduced.

FIG. 2 shows another embodiment of the present invention. FIG. 3A is a perspective view as seen from diagonally above left, and FIG. 4B is a perspective view as seen from diagonally above right. This is because the one-phase component is formed on the heat pipe base surface 18a, and the one-phase component is formed on the heat pipe base surface 18b. Is arranged.

For this reason, the configuration shown in FIG. 1B and the configuration shown in FIG. 2B are left-right symmetric. That is, the arrangement shown in FIG. 4 does not have left-right symmetry between the configuration shown in FIG. 4A and the configuration shown in FIG. 4B, but in the present invention, the configuration shown in FIG. It is possible to make the electrical and thermal characteristics uniform in each phase.

[0012]

According to the invention of claim 1, the constituent elements for one phase constituting the power converter including the inverter are constituted by one surface of the base surface of the heat pipe, and the wiring between the constituent elements is shortest. Since it is configured as described above, it is possible not only to reduce the wiring inductance which is the main cause of the surge applied to the element but also to simplify the wiring. By reducing the wiring inductance, the snubber circuit is also made smaller and less expensive. According to the invention of claim 2, since the constituent elements of a total of two phases are arranged on each of both surfaces of the base surface of the heat pipe,
The number of heat pipes required to form the unit can be reduced, and the size and cost can be reduced. Further, by configuring the respective structures on both sides to be equal to each other, it is possible to eliminate the influence due to the difference in structure, and as a result, it is possible to make the electrical and thermal characteristics uniform in each phase.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a configuration diagram showing another embodiment of the present invention.

FIG. 3 is a circuit diagram showing a conventional example.

FIG. 4 is a configuration diagram showing a conventional example.

[Explanation of symbols]

1 to 4 ... IGBT (insulated gate bipolar transistor), 5, 6 ... Diode, 7 ... Capacitor, 8 to 1
7, 19, 20 ... Wiring conductors, 18a, 18b ... Heat pipe base surface.

Claims (2)

[Claims] 1. A component for one phase of a vehicle-mounted power conversion device, which comprises an insulating switching element and a diode and which performs three-level operation, is arranged on one surface of a base surface of a heat pipe. Vehicle-mounted power converter. 2. A component for one phase of a vehicle-mounted power conversion device, which is composed of an insulating switching element and a diode and which performs three-level operation, is arranged on each of both sides of a base surface of a heat pipe. A vehicle-mounted power converter.