Explosion-proof four-quadrant frequency converter
Technical field
The utility model relates to the frequency converter field, more particularly, relates to a kind of explosion-proof four-quadrant frequency converter.
Background technology
Along with the progress of science and technology, the motor frequency conversion control technology has been widely used in the fields such as machinery, metallurgy, light textile and household electrical appliance.In the inflammable and explosive environment such as mine, petrochemical industry, be widely used high-power high-tension large-size machine, the relatively common frequency converter of frequency converter that these occasions are used is harsher.Explosion-proof frequency converter is namely the frequency converter product for above-mentioned particular application.
Explosion-proof frequency converter requires relatively common frequency converter harsher due to the uniqueness of industry and application.Especially more and more higher to the power density requirement, product must have high power density, but but also requires installation and maintenance simple and convenient.
The busbar layout is the key factor that affects the frequency converter performance: good busbar layout has low stray inductance, has greatly improved the Performance And Reliability of frequency converter; On the contrary, poor busbar layout will reduce properties of product greatly, even causes aircraft bombing.
The experiment proved that, in frequency converter, a common busbar overlapped points can be brought the stray inductance of 30～50NH.Most explosion-proof four-quadrant frequency converter DC master row layout in the market is comparatively numerous and diverse, and the copper bar switching is more, and the stray electrical sensibility reciprocal all can reach 200～300NH usually, has had a strong impact on the performance of explosion-proof frequency converter, makes the aircraft bombing probability of explosion-proof frequency converter larger.
The utility model content
The technical problems to be solved in the utility model is, for the larger problem of above-mentioned explosion-proof four-quadrant frequency converter stray inductance, provides a kind of stray inductance less explosion-proof four-quadrant frequency converter.
The technical scheme that the utility model solves the problems of the technologies described above is, a kind of explosion-proof four-quadrant frequency converter is provided, and comprises base, positive busbar, negative busbar and is separately fixed at a plurality of power cells on described base, described positive busbar, the negative superimposed setting of busbar; Described a plurality of power cell lays respectively at the binding post of the both sides of described positive busbar and negative busbar and these a plurality of power cells respectively towards positive busbar and negative busbar; Described positive busbar and negative busbar are electrically connected to respectively the binding post of each power cell by the connecting pin of both sides.
In explosion-proof four-quadrant frequency converter described in the utility model, described explosion-proof four-quadrant frequency converter also comprises capacitive, and described capacitive is arranged on the power cell top of positive busbar and negative busbar one side and the bus of this capacitive directly is overlapped on positive busbar and negative busbar.
In explosion-proof four-quadrant frequency converter described in the utility model, described positive busbar connects the part of power cell binding post higher than both sides with the mid portion of being connected busbar, and the busbar shiplap joint of described capacitive is at the mid portion of positive busbar and negative busbar.
In explosion-proof four-quadrant frequency converter described in the utility model, described positive busbar and negative busbar are several fonts perpendicular to the cross section of power cell arrangement direction.
In explosion-proof four-quadrant frequency converter described in the utility model, a side of described capacitive is installed to base by pivot or hinge.
In explosion-proof four-quadrant frequency converter described in the utility model, described explosion-proof four-quadrant frequency converter comprises 12 power cells, and these 12 power cells are in the bilateral symmetry setting of described positive busbar and negative busbar.
In explosion-proof four-quadrant frequency converter described in the utility model, described power cell is IGBT.
In explosion-proof four-quadrant frequency converter described in the utility model, be provided with insulating barrier between described positive busbar and negative busbar.
Explosion-proof four-quadrant frequency converter of the present utility model has following beneficial effect: by optimizing the layout of positive busbar, negative busbar and power cell, can significantly reduce the stray inductance of whole equipment, thereby improve reliability and the performance of equipment.
Description of drawings
Fig. 1 is the schematic diagram of explosion-proof four-quadrant frequency converter the first embodiment of the utility model.
Fig. 2 is the schematic diagram of explosion-proof four-quadrant frequency converter the second embodiment of the utility model.
Fig. 3 is the schematic diagram in the cross section of explosion-proof four-quadrant frequency converter in Fig. 2.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.
As shown in Figure 1, be the schematic diagram of explosion-proof four-quadrant frequency converter embodiment of the present utility model.Explosion-proof four-quadrant frequency converter in the present embodiment comprises base 10, positive busbar 11, negative busbar 12 and a plurality of power cell 13(example 12 power cells 13 as shown in Figure 1), wherein a plurality of power cells 13 are separately fixed on base 10.Positive busbar 11, the negative superimposed setting of busbar 12, a plurality of power cells 13 lay respectively at the both sides (for example 12 power cells 13 shown in Fig. 1 are in the bilateral symmetry setting of positive busbar 11 and negative busbar 12) of superimposed positive busbar 11 and negative busbar 12.The binding post of above-mentioned a plurality of power cell 13 is respectively towards superimposed positive busbar 11 and negative busbar 12, and positive busbar 11 and negative busbar 12 are electrically connected to respectively the binding post of each power cell 13 by the connecting pin of both sides.
Because power cell 13 is distributed in positive busbar 11 and negative busbar 12 both sides, and positive busbar 11 and the superimposed setting of negative busbar 12, make all power cells 13 all only be connected to positive busbar 11 and negative busbar 12 by an overlapped points, greatly reduce the stray inductance of whole equipment, improved the reliability of equipment.
As shown in Fig. 2,3, it is the schematic diagram of the second embodiment of explosion-proof four-quadrant frequency converter of the present utility model.Explosion-proof four-quadrant frequency converter in the present embodiment also comprises capacitive 30 except comprising base 20, positive busbar 21, negative busbar 22 and a plurality of power cell 23.This capacitive 30 is arranged on the top of power cell 23 of superimposed positive busbar 21 and negative busbar 22 1 sides and the bus (bus of capacitive 30 comprises positive busbar 31 and negative busbar 32) of this capacitive 30 directly is overlapped on positive busbar 21 and negative busbar 22.
Because the bus of capacitive 30 is also once to be overlapped on positive busbar 11 and negative busbar 12, be connected to the scheme of positive busbar 21 and negative busbar 22 by overlap joint repeatedly than the capacitive bus, the stray inductance of whole equipment increases less.
Especially, above-mentioned positive busbar 21 connects the part (for example the edge of positive busbar 21 and negative busbar 22 is several fonts perpendicular to the cross section of power cell 23 orientations) of power cell 23 binding posts higher than both sides with the mid portion of being connected busbar 22, that is to say, the mid portion of positive busbar 21 and negative busbar 22 is less apart from the distance of capacitive, and the busbar shiplap joint of capacitive 30 is the mid portion of positive busbar 21 and negative busbar 22 (being the mid portion that bus and the overlapped points of positive busbar 21 and negative busbar 22 of capacitive 30 is positioned at positive busbar 21 and negative busbar 22).Like this, can dwindle the distance that is connected of capacitive 30 and positive busbar 21, negative busbar 22.
In the explosion-proof four-quadrant frequency converter of the positive busbar 21 of layout by the way, negative busbar 22,12 power cells 23 and capacitive 30, the stray inductance of whole equipment can be reduced to only has the 96NH left and right, has greatly improved reliability and the performance of frequency converter.
Especially, a side of above-mentioned capacitive 30 is installed to base 20 by pivot or hinge, thereby when safeguarding, making capacitive 30 around pivot or hinge rotation to the device below capacitive 30 (for example power cell 23), more easily opens capacitive 30.
In above-mentioned explosion-proof four-quadrant frequency converter, power cell 13 or 23 can an employing IGBT.And in order to improve the stability of a system, above-mentioned positive busbar 11,21 and negative busbar 12,22 between insulating barrier (Zhu Ru Nuo Mike paper etc.) can be set.
The above; it is only the better embodiment of the utility model; but protection range of the present utility model is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; the variation that can expect easily or replacement are within all should being encompassed in protection range of the present utility model.Therefore, protection range of the present utility model should be as the criterion with the protection range of claim.