JPH0223104Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an inverter device, and more particularly to an inverter device that uses modular semiconductor components and has a simplified wiring structure.

2. Description of the Related Art A known inverter main circuit used in a drive circuit for an induction motor or the like has a circuit configuration as shown in FIG. 1, for example. This device consists of six switching transistors TR1-TR6 connected in parallel in two sets on the power supply side, resistors R1-6 and capacitors C1-6 connected between the emitter and collector of each transistor TR1-TR6. The three-phase induction motor 1 is rotated by the gate signals given to the transistors TR1 to TR6. Control speed.

This device includes a circuit such as a snubber circuit (a circuit that protects transistors TR1 to TR6 by suppressing the rate of voltage rise during switching to a low level by using a series circuit of R1 to C1 and C1 to 6) in the part where a large current flows. Because the parts were attached, the wiring was complicated and there were problems with assembly work. Therefore, with the aim of simplifying the main circuit wiring, a modular transistor as shown in FIG. 2 was developed and began to be used. This modular transistor consists of the two transistors indicated by the chain line in Figure 1, namely TR1.
and TR2, TR3 and TR4, and TR5 and TR6 are housed in one package, and this modular transistor 2,
By using 3 and 4, it is simpler than before. However, the installation of snubber circuit components and the like has not yet been improved.

This invention was made in view of the above-mentioned shortcomings of the conventional technology, and the purpose is to provide an inverter device that uses modularized semiconductor components, has a simplified wiring structure, and has improved assembly workability. shall be.

To achieve this objective, this invention uses modular transistors in which two switching transistors are modularized as each inverter switching circuit corresponding to each phase of a three-phase induction motor, and these three modules The positive and negative lead plates, which are common to each module type transistor and consist of a single metal plate and form the positive and negative side busbars, are directly attached to the positive and negative terminals of the three module transistors. Connect the positive terminal of the printed circuit board with electronic components wired to the positive lead plate, connect the negative terminal of the printed circuit board to the negative lead plate, and connect the printed circuit board to the positive lead plate and the negative lead. At the same time, three modular transistors are installed on a base plate consisting of one heat dissipation fin, and arranged and fixed at a predetermined distance from each other on this base plate. The printed circuit board is arranged between one module type transistor and another module type transistor that are adjacent to each other.

Hereinafter, embodiments of this invention will be described based on the accompanying drawings.

FIG. 3 is a perspective view of the inverter device according to this embodiment. This inverter device consists of the inverter main circuit shown in FIG. 1, and therefore,
Components having the same reference numerals as those used in FIG. 1 will be described using the same reference numerals.

This inverter device has the following configuration. That is, a modular transistor 2 housed in a columnar package as shown in FIG.
Three pieces, numbered 3 and 4, are arranged in parallel at approximately equal intervals on a base plate 10, for example, a heat dissipation fin made of extruded aluminum, and are fixed with screws or the like. These modular transistors 2, 3, and 4 include two transistors TR1 and TR2, TR3 and TR4, and TR4 connected in series as shown in FIG.
5 and TR6 are housed in the package together with protective diodes D1 to D6 connected between the collector emitters of each of the transistors TR1 to TR6, and the top surface of this package has a collector side terminal C, a base side terminal B, Common terminals E and C on the emitter side and the collector side, a base side terminal B, and an emitter side terminal E are arranged in this order. Therefore, the modular transistors 2, 3, and 4 are arranged in parallel on the base plate 10 so that the collector terminals C located near one end are aligned in a straight line. A lead plate 1 connects each collector side terminal C and each emitter side terminal E in a direction substantially orthogonal to the modular transistors 2, 3, and 4.
1 and 12 are attached with screws or the like. The lead plates 11 and 12 are formed of metal plates such as copper plates, for example, and the lead plate 11 connected to each collector side terminal C on one side connects the (+) side line to each emitter side terminal E on the other side. Lead plate 1 connected to
2 constitute (-) side lines, respectively. Two rectangular printed circuit boards 13 and 14 are arranged between the three modular transistors 2, 3, and 4 connected by the lead plates 11 and 12, and screws 20, 21, 22, Lead plate 1 with 23 mag.
It is fixed at 1 and 12. One of the two printed circuit boards 13 and 14, the printed circuit board 11, has a series circuit R of a resistor and a capacitor shown in FIG.
1・C1, R2・C2, R3・C3 and R4・C
4 sets of snubber circuits are wired, and are connected to the modular transistors 2 and 3 by two upper and lower screws 20 and 21 and two lead wires 25 and 26 extending from the center of the snubber circuit. Ru. Furthermore, the other printed circuit board 14 has a series circuit R of a resistor and a capacitor shown in FIG.
Two sets of snubber circuits consisting of 5.C5 and R6.C6 are wired, as well as a surge absorbing component TNR and a smoothing capacitor _C0 as necessary.As above, the two screws 22, upper and lower, 23 and lead wire 27 in the center, the snubber circuit connects to the modular transistor 4 and the surge absorption component TNR.
are connected between the lead wires 11 and 12, respectively. Therefore, in this inverter device, power is applied to the (+) side lead plate 11 and the (-) side lead plate 12, and a gate signal is applied to each base side terminal B of the modular transistors 2, 3, and 4. The output is taken from the emitter/collector side common terminals E and C of the modular transistors 2, 3, and 4, and drives the induction motor 1 via lead wires or the like. That is, in this embodiment, by taking advantage of the advantages of the modular transistors 2, 3, and 4, the modular transistors 2, 3, and 4 are connected at approximately equal intervals between their (+) side terminal (C terminal) and (-) side terminal ( E terminals) are located on a straight line, and the modular transistors 2, 3, 4
Lead plates 11 and 12 are used to connect the (+) side terminal and (-) side terminal of the 13,1
4, and the printed circuit boards 13 and 14 are arranged between the modular transistors 2, 3 and 4, and are attached to the lead plates 11 and 12 with screws 20, 21, 22, 23, etc. .
Therefore, lead plates 11 and 12 are provided in the large current portion.
For circuit parts such as snubber circuits, lead plate 1 is used.
Printed circuit board 1 with 1 and 12 fixed as a support frame
3, 14, and this printed circuit board 1
3 and 14 are also located between the module type transistors 2, 3, and 4, which not only improves space utilization and simplifies wiring and installation work, but also allows for the use of conventional snubber circuit components. Reliability is also improved compared to those that are directly screwed together.

In the above embodiment, the inverter main circuit that obtains three-phase output was explained as an inverter device.
In the case of a single-phase output inverter circuit, only one modular transistor and one printed circuit board are sufficient.

As explained above, according to the present invention, first, three
For each inverter switching circuit corresponding to each phase of a phase induction motor, a modular type transistor in which two switching transistors are modularized is used. Since no wiring is required for the common connection point of the transistors,
The wiring structure becomes simpler and assembly work becomes easier.

In addition, the positive and negative lead plates, which are made of a common single metal plate and form the positive and negative bus bars, are connected to the positive and negative terminals of the three modular transistors through each of the three modular transistors. It is designed to be installed directly. Therefore, there is no need to install any other parts between the terminals of the modular transistor and the lead plate to connect them.
Therefore, from this point of view as well, the assembly work becomes easier.

In addition, three modular transistors are combined into one
Since the transistors are arranged on a base plate consisting of two heat dissipation fins, each transistor can be easily attached to the heat dissipation fins.

[Brief explanation of the drawing]

FIG. 1 is an inverter main circuit diagram for explaining a conventional inverter device, FIG. 2 is a perspective view of a modular transistor, and FIG. 3 is an external view of an inverter device according to an embodiment of the invention. 2, 3, 4...Modularized semiconductor components, 10...Base plate (heat dissipation fin), 11, 12...
...Lead board, 13, 14...Printed circuit board.

Claims (1)

[Claims for Utility Model Registration] The first transistor has first and second transistors, the base of which serves as an input terminal for a switching control signal;
The emitter of the transistor and the collector of the second transistor are commonly connected, and the common connection terminal is used as a drive current output terminal for one phase of the three-phase induction motor, and the collector of the first transistor is connected in common. and the emitter of the second transistor are housed in one package, and the switching circuit has a positive terminal and a negative terminal connected to the positive and negative bus bars, respectively, and the control signal input terminal is connected to the outside of the package. and three modular transistors in which the drive current output terminal and the positive and negative electrode terminals are arranged, and the three modular transistors are arranged at a predetermined distance from each other on a base plate made of one heat dissipation fin. The positive lead plate, which is made of a single metal plate common to the three modular transistors and forms a positive bus bar, is directly connected to the positive terminals of the three modular transistors. A negative lead plate, which is made of a single metal plate common to the three modular transistors and forms a negative bus, is directly attached to the negative terminals of the three modular transistors. , a printed circuit board on which electronic components are wired is disposed between one module transistor and another module transistor adjacent to each other among the three modular transistors, and the printed circuit board has a positive terminal connected to the The printed circuit board is installed between the positive lead plate and the negative lead plate such that the printed circuit board is connected to the positive lead plate and its negative terminal is connected to the negative lead plate. Features of the inverter device.