JPH11235056A - Output connecting structure of high frequency inverter stack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make easier assembling and disassembling and reduce wiring inductance by previously forming a female screw at the end part of an output conductor of a high frequency inverter stack in opposition to a laminate-shape bus bar surface for connecting a load and then fixing it by screwing a bolt to the female screw from the rear. SOLUTION: An inverter stack output conductor is composed of a U-phase conductor 1 and a V-phase conductor 2 provided in parallel sandwiching an insulating film 5 therebetween and a laminate bus bar is composed of a U-phase bus bar 3 and a V-phase bus bar 4 and an insulating film 6 sandwiched therebetween. Here, the U-phase side is connected by screwing a bolt 8 provided through an insulating plate 91, the U-phase bus bar 3 and a conductor spacer 7 to a female screw previously formed at the end part of the U-phase conductor 1. Moreover, the V-phase side is connected by screwing a bolt 8 provided through the insulating plate 92, insulating film 5 and V-phase bus bar 4 to the female screw previously formed in the end part of the V-phase conductor 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a connection structure for connecting an output of a high-frequency inverter stack to a load.

[0002]

2. Description of the Related Art In a semiconductor power converter, a bus bar having a laminated shape (laminate bus bar) is generally used to connect an output of an inverter (high frequency inverter) that outputs a high frequency to a load circuit. FIG. 6 is an exploded view showing a conventional example of an inverter stack output wiring, and FIG. 7 is a circuit diagram showing an example of a plurality of parallel connections. 6, reference numeral 1 denotes a U-phase conductor of an inverter stack output, 2 denotes a V-phase conductor, 3 denotes a U-phase bus bar, 4 denotes a V-phase bus bar, 5 denotes an insulating film of an output conductor, and 6 denotes an insulating film of a laminated bus bar. In FIG. 7, reference numeral 10 denotes a detector (HFCT) for detecting high-frequency current, and reference numeral 11 denotes a direct current (DC) cut capacitor. FIG. 7 shows a main circuit of a full-bridge inverter, and since its configuration and operation are well known, description thereof will be omitted.

The output connection structure will be described below. That is, the output conductor of the inverter stack is configured such that the U-phase conductor 1 and the V-phase conductor 2 and the insulating film 5 interposed therebetween are arranged in parallel and close to each other. The tip is bent into an L shape, and a hole for passing a bolt is formed in the end face. The U-phase bus bar 3 and the V-phase bus bar 4 are formed with connection terminals (extensions) extending outward. Further, the end face of the U-phase conductor 1 and the connection terminal face of the U-phase bus bar 3 and the end face of the V-phase conductor 2 and the connection terminal face of the V-phase bus bar 4 are fixed with bolts and nuts, respectively. Here, an example in which a transparent member is used as the insulating films 5 and 6 is shown.

[0004]

However, in the above configuration, when the U-phase conductor 1 and the U-phase bus bar 3 are connected, and the V-phase conductor 2 and the V-phase bus bar 4 are connected, the laminated bus bars of the respective phases are connected. There is a problem that the wiring inductance of this portion increases because the connection is made with the extended terminal (extended portion). At the same time, securing the insulation distance between the U-phase and the V-phase (see the gap in FIG. 6) further increases the wiring inductance. Another problem is that since the connection between the output conductor and the laminate busbar is made by bolts and nuts, assembly and disassembly are complicated and time-consuming. Therefore, an object of the present invention is to make assembly and disassembly easy, and not to increase wiring inductance.

[0005]

In order to solve such a problem, according to the first aspect of the present invention, a female bus bar is cut in advance at a tip of an output conductor of a high-frequency inverter stack, and a laminated bus bar for connecting a load is provided. The bolt is screwed into the female screw from the back side and fixed. According to the first aspect of the invention, a block-shaped component can be inserted between the output conductor and the bus bar (the second aspect of the invention). According to the first or second aspect of the invention, a laminated component can be interposed between the output conductor and the bus bar (the third aspect of the invention).

[0006]

1 to 3 show a first embodiment of the present invention.
1 is an assembly exploded view, FIG. 2 is a partial configuration diagram showing a configuration of a bus bar, and FIG. 3 is a connection configuration diagram showing a connection state. In these figures, 7 is U
The phase conductor spacers, 8 are connection bolts, 91 and 92 are insulating plates for adjusting the bolt length, and the other components are the same as the conventional example. As shown in FIG. 1, the output conductor of the inverter stack is composed of a U-phase conductor 1 and a V-phase conductor 2 which are close to and parallel to each other with an insulating film 5 interposed therebetween, as in FIG. 6.
Laminate busbars are U-phase busbar 3, V-phase busbar 4.
And an insulating film 6 interposed therebetween. The output conductors of the U-phase conductor 1 and the V-phase conductor 2 are provided with internal threads for screwing the bolts 8.

As shown in FIG. 2A, the U-phase bus bar 3 has a hole for connecting the U-phase conductor 1 and the conductor spacer 7, and a window for insulating the V-phase connection bolt. As shown in FIG. 2C, a hole for connecting the V-phase conductor 2 and a window for insulating the U-phase conductor 1 are formed in the V-phase bus bar 4. As shown in FIG. 2B, the insulating film 6 has a window for connecting the U-phase bus bar 3 and the conductor spacer 7 and a V-phase bus bar 4.
And a hole for connecting the V-phase conductor 2 with the V-phase conductor 2. U
Phase busbar 3, insulating film 6 and V phase busbar 4
It goes without saying that are superimposed in this order.

FIG. 3 illustrates these connection states.
(A) is a top view, (b) is a side view, and (c) is a front view as seen from the head side of the bolt. As is clear from FIG. 3A, the connection on the U-phase side is performed by screwing the insulating plate 91, the U-phase bus bar 3 and the conductor spacer 7 to the internally threaded U-phase conductor 1 with bolts 8. . Similarly, the connection on the V-phase side is made by screwing the insulating plate 92, the insulating film 6 and the V-phase bus bar 4 to the internally threaded V-phase conductor 2 with bolts 8, as is apparent from FIG. Done. The insulating films 51 and 52 are
When the stack is disassembled, the stack side is separated into the insulating film 51 and the busbar side is separated into the insulating film 52, and the insulating film 52 is fitted into the gap where the windows of the U-phase busbar 3, the V-phase busbar 4 and the insulating film 6 intersect. .

FIG. 4 is a block diagram showing a second embodiment of the present invention. This is an example in which a block-shaped component such as the HFCT 10 including the primary conductor 10A and the core 10B is inserted between the stack output conductor and the bus bar. That is, the connection on the U-phase side is, as shown in FIG. 4, by screwing the insulating plate 91, the U-phase bus bar 3, the conductor spacer 7, and the primary conductor 10A of the HFCT 10 with the bolt 8 to the female-threaded U-phase conductor 1. Done by Similarly, the connection on the V-phase side is as shown in FIG.
This is performed by screwing the insulating plate 92, the insulating film 6, the V-phase bus bar 4, and the primary conductor 10 </ b> A of the HFCT 10 with the bolt 8 to the female-threaded V-phase conductor 2.

FIG. 5 is a configuration diagram showing a third embodiment of the present invention. This is a configuration in which a block-shaped component such as HFCT 10 is inserted between a stack output conductor and a bus bar, and a laminated capacitor 11 is further connected. In the figure, reference numeral 12 denotes an insulating film for insulating the capacitor 11 on the U-phase side, and insulates the electrode B of the capacitor 11 on the U-phase side from the V-phase bus bar 4.
Reference numeral 13 denotes an insulating tube.

That is, the connection on the U-phase side is, as shown in FIG. 5, the female thread is cut by the bolts 8 together with the insulating plate 91, the U-phase bus bar 3, the conductor spacer 7, the capacitor 11, and the primary conductor 10A of the HFCT 10. It is performed by screwing up to the U-phase conductor 1 that has been set. Similarly, for the connection on the V-phase side, as shown in FIG.
V-phase busbar 4, capacitor 11 and HFCT
This is performed by screwing the 10 primary conductors 10A together with the bolts 8 to the female threaded V-phase conductor 2. In order to prevent a short circuit between the electrode A side and the electrode B side of the capacitor 11 due to contact of the bolt, the bolt 8 is covered with an insulating tube 13 from the head of the bolt to a point where the terminal of the capacitor 11 is passed. Although the HFCT 10 and the capacitor 11 are inserted in FIG. 5, the same applies to the case where only the capacitor 11 is connected.

As described above, in any case, the assembly and disassembly of the stack can be performed only by the bolts 8, so that the work is facilitated and the work time is shortened. Since it is not necessary to provide the bus bar with the extension, the wiring inductance can be reduced.

[0013]

According to the present invention, the bus bar does not need to be provided with an extension, so that the wiring inductance can be reduced. As a result, the voltage drop can be suppressed and unnecessary vibration due to the wiring inductance and the stray capacitance between conductors can be reduced. It is possible to achieve suppression. In addition, since no nut is required, the stack can be removed simply by loosening the bolt, that is, advantages such as easy assembly and disassembly can be obtained. Furthermore, even when the inverter stacks are connected in parallel, the wiring of each stack can be made uniform, so that there is an advantage that the current sharing can be balanced.

[Brief description of the drawings]

FIG. 1 is an exploded view showing a first embodiment of the present invention.

FIG. 2 is a partial configuration diagram of a bus bar according to the first embodiment of the present invention.

FIG. 3 is a connection configuration diagram showing the first embodiment of the present invention.

FIG. 4 is a connection configuration diagram showing a second embodiment of the present invention.

FIG. 5 is a connection configuration diagram showing a third embodiment of the present invention.

FIG. 6 is an exploded view showing a conventional example.

7 is an example of a circuit diagram in which a plurality of inverter stacks shown in FIG. 6 are connected.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... U-phase conductor, 2 ... V-phase conductor, 3 ... U-phase busbar, 4 ...
V-phase bus bar, 5, 51, 52, 53, 6, 12 ... insulating film, 7 ... conductor spacer, 8 ... bolt, 91, 92
... Insulating plate, 10 ... Current detector (HFCT), 11 ... DC
Cut capacitor, 13 ... Insulated tube.

Claims (3)

[Claims] 1. A female screw is cut in advance at the tip of an output conductor of a high-frequency inverter stack to face a laminate-shaped bus bar surface to which a load is connected, and a bolt is screwed into the female screw from behind to fix the screw. Output connection structure of the high frequency inverter stack. 2. The output connection structure for a high frequency inverter stack according to claim 1, wherein a block-shaped component is interposed between said output conductor and a bus bar. 3. A laminated component is interposed between the output conductor and a bus bar.
Or the output connection structure of the high-frequency inverter stack according to 2.