JPS5852435B2 - semiconductor rectifier - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a semiconductor rectifier device in which the supply direction of DC output current can be switched by selective conduction control of anti-parallel connected circuits.

This type of semiconductor rectifier is used as a power source for driving a DC motor, a power source for copper electrolysis, a power source for copper plating, etc., and an example of a connection diagram thereof is shown in FIG.

In the figure, T is a rectifier transformer having secondary windings u, v2w, X, y, z, D is a rectifier, L is an interphase reactor,
The transformer T has a double star connection.

In addition, the rectifier is a thyristor 1P that allows direct current to flow in the positive direction (when terminal T1 has positive polarity and terminal T2 has negative polarity).
The rectifying element is an antiparallel connection of thyristors 1R and thyristors 1R that flow DC current in the opposite direction, one end of which is connected to the DC side conductor 10 of the main circuit conductor via the protective fuse 4, and the other end is connected to the AC side conductor 11. ing.

Na#, Gl, and G2 are gate circuits for igniting Cyrisk IP and IR.

Note that although a double star connection is illustrated, other connections such as a three-phase bridge connection may be used.

In this rectifier circuit, when the gate circuit G1 is operated and the thyristor 1P is fired, a DC current flows from the terminal T1 through the load to the terminal T2.When the gate circuit G2 is operated and the thyristor 1R is fired, the DC current flows from the terminal T1 through the load to the terminal T2. flows from terminal T2 to terminal T1 via the load.

By the way, when such a rectifier is used as a DC power supply as mentioned above, the current rating may reach several thousand amperes to tens of thousands of amperes, and a flat thyristor is used as the thyristor, as shown in Figure 2. It is configured as a cyrisk stack as shown.

That is, the thyristor stack 6 is constructed by sequentially stacking the thyristor 1, the cooling piece 2, and the insulating spacer 3, and fixing both ends thereof by a tightening mechanism 5, and the current terminal 7 is connected to the cooling piece 2.

This stack can also be used as part of the device shown in FIG. 1, which allows thyristors to be connected in series and parallel by changing the order or number of stacks.

Figure 3 shows an expanded connection diagram of the rectifier arm in a conventional rectifier, where 10 and 11 are the main circuit conductors connected to the rectifier element (or stack), and here 10 is the DC D
The C side conductor 11 is referred to as an AC side conductor.

IP and IR are thyristors, 4 is a protection fuse, and 6 is a thyristor stack, and the thyristors IP and IR are stacked in the stack 6 so that their reverse conduction directions are the same.

Therefore, the number of thyristors equal to the sum of the number of forward and reverse direction elements in one rectifying arm is stacked.

FIG. 4 shows a cross section of a rectifier made up of the circuit connected as shown in FIG. 3, and T3 is an AC input terminal of the rectifier.

The DC side conductor 10, the AC side conductor 11, and the silice stack 6 are arranged parallel to each other.

In a device with such a configuration, as shown in FIG.
The height of the rectifier also increases as a result.

This not only increases the cost of materials such as the connecting conductor frame, but also increases the height, making assembly difficult.

Furthermore, when the length of the rectifier unit becomes longer, the self-inductance of the conductor increases, which causes poor current balance between the parallel circuits and causes a decrease in performance.

The present invention aims to eliminate the above-mentioned drawbacks, provide a semiconductor rectifier that can be manufactured compactly and inexpensively, and has good performance.

The present invention will be explained in detail below based on illustrated embodiments.

However, the same components as in FIGS. 1 and 3 are given the same reference numerals.

FIG. 5 shows a developed connection diagram of the rectifier arm of the rectifier according to the present invention, where 10 is a DC side conductor, 11 is an AC side conductor, 1P is a cyrisk that allows current to flow from terminal T1 through a load to terminal T2, This Cyrisk 1P has a stack of 6-1
is incorporated into.

IR is a sirisk that allows current to flow from the terminal T2 to the terminal T1 via the load, and is incorporated in the stack 6-2.

4 is a fuse. As shown in FIG. 6, both stacks 6-1 and 6-2 are arranged on both sides of the DC side conductor 10 and the AC side conductor 11 so as to be parallel to each conductor '10. They are installed so that they can be seen directly from the front and back.

Note that T1 is a DC output terminal, T3 is an AC input terminal, and the secondary winding of the rectifier transformer T shown in FIG. 1 is connected to this AC input terminal T3.

Figures 7 and 8 show both thyristor stacks 6-1.6.
8, the DC side conductor 10 and the AC side conductor 11 are provided adjacent to each other as shown in FIG.

A fuse attachment conductor 9 is attached to the DC side conductor 10 by welding or bolting, and one or more fuses 4 are fixed to this conductor 9 with bolts.

A conductor 8 is attached to the other terminal of the fuse 4,
It is connected to the terminal 7 of the stack 6'-1, 6-2 via an auxiliary conductor 7'.

In addition, 12 includes both stacks 61, 6-2 and the AC side conductor 11.
It is a connecting conductor that connects the

The semiconductor rectifier according to the present invention is constructed as described above, and has the following advantages.

(B) Stack 6-1.6-2 stacks only thyristors 1P or 1R in the forward or reverse direction, so its length is significantly shortened compared to the conventional one, and the installation space can be reduced. .

(b) By shortening the stack length, the lengths of the conductors 10 and 11 are also shortened, and the material costs and processing costs thereof are reduced.

(c) The overall height of the device is reduced, reducing processing costs, improving workability, and facilitating manufacture.

b) Fuse 4 and conductors 8, 9 are made of common materials for both stacks, so that increases in material costs related to fuse installation are minimized.

(e) Even if the current ratings in the forward and reverse current directions are different, the same effect can be achieved by appropriately selecting the number of parallel stacks 6-1, 6-2.

Moreover, even in this case, the structure of the fuse 4, conductors 8, 9, etc. may remain completely unchanged.

(f) Since the length of the rectifier unit is shortened, the self-inductance of the AC side conductor and DC side conductor is reduced, and the current balance between the parallel circuits is improved, and as a result, the number of parallel elements and the number of fuses can be reduced. can.

In addition, if the number of parallel elements is the same, it is possible to select a fuse with a smaller rated current, reducing costs. At the same time, the current value of the thyristor, which carries the maximum current between parallel elements, is reduced, making it possible to connect thyristors. The temperature rise in the parts is suppressed and the reliability of operation is increased.

(g) Since the fuse is attached to the DC side or AC side conductor, the fuse can also be cooled by cooling the conductor with water or the like.

In the above embodiment, the fuse 4 was attached to the DC side conductor 10 (or AC side conductor 11) via the mounting conductor 9, but as shown in FIGS. 9 and 10, the fuse 4 was attached directly to the DC side conductor 10. (or the AC side conductor 11).

If the fuse 4 is mounted in this manner, the mounting conductor 9 can be omitted, but the work of mounting the fuse 4 is somewhat inconvenient.

As described above, according to the present invention, an inexpensive and high-performance semiconductor rectifier can be provided.

[Brief explanation of the drawing]

Figure 1 is a circuit diagram showing an example of a rectifier that can supply DC output current in both forward and reverse directions, Figure 2 is a structural diagram of a thyristor stack, Figure 3 is a circuit diagram of a rectifier arm in a conventional device, and Figure 4 is a sectional view of a conventional rectifier, FIG. 5 is a circuit diagram showing a rectifying arm of a rectifying device according to the present invention, FIG. 6 is a sectional view of the same device, and FIG. 7 is an example of the configuration of a rectifying arm of the same device. Side view, Figure 8 is a sectional view taken along line A-A in Figure 7, Figure 9
The figure is a side view showing another configuration example of the rectifying arm, and FIG. 10 is a sectional view taken along the line B--B in FIG. 9. IP, IR...Sirisk, 2...Cooling piece, 3...Insulating spacer, 4...Fuse, 6-1, 6-2... ...Thyristor connector, 9...Fuse mounting conductor, 10...
・DC side conductor, 11... AC side conductor.

Claims (1)

[Claims] 1. In a rectifying device that can switch the direction of a DC output current in both forward and reverse directions by selectively firing thyristors connected in antiparallel, a stack of thyristors conducts in the forward direction and a stack of thyristors conducts in the opposite direction. A stack of thyristors that communicate with each other is placed on both sides of the AC and DC conductors that make up the rectifier arm, parallel to these conductors, and one terminal of the fuse is attached to the AC or DC conductor, and the other terminal is connected to the AC or DC conductor. A semiconductor rectifier device characterized in that both stacks share the same. 2. The semiconductor rectifier according to claim 1, wherein a fuse attachment conductor is used in the attachment portion of the fuse to the AC side conductor or the DC side conductor.