JPH03292764A - Transistor module and inverter device - Google Patents

Abstract

PURPOSE:To use terminals in common so as to reduce them to an irreducible minimum in number by a method wherein transistors whose emitters are connected to each other and conductors which are arranged passing near base terminals to connect the emitters of the transistors and connected to the common emitter terminals of the transistors are provided. CONSTITUTION:A conductor 3 connects the emitters of transistors together as located at the same level (or on a plane near to base terminals) with base terminals B2, B4, and B6. Wirings between the transistor chips and the joints of the conductor 3 with the emitters are laid in parallel with the wirings of the base terminals. An emitter signal wiring pattern 4 is provided onto a printed board 2 just above a part a, and emitter signals outputted from base drive circuits are connected at a part b. This wiring path is a route composed of a part b-an N terminal-a part a and physically long in wiring length, but it is laid as returned back halfway in parallel, so that it is very small in inductance. Therefore, an emitter signal connected to a part b is equivalently equal to that connected to a part a.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to the structure of a transistor module used in an inverter or the like that drives an AC motor at variable speed, and an inverter device using this transistor module.

(Prior art) In recent years, there has been an increasing demand for higher integration and higher reliability for inverter devices that drive AC motors at variable speeds, and to meet these needs, transistor modules with built-in multiple transistors have been put into practical use. has been done.

FIG. 4 shows an external view of a transistor module IO currently in practical use. This transistor module 10
This is a module in which all six transistors that make up an inverter are packaged into one package, and is convenient because an inverter can be made up of just one module. FIG. 5 shows an internal circuit diagram of this transistor module IO.

This transistor module IO has all terminals arranged on the top surface and on the same plane, so that connections to each terminal can be made using a printed circuit board, and
By using screw-fastened connection terminals, the number of man-hours required for wiring the device can be reduced. Furthermore, as shown in the internal circuit diagram of FIG.
) By using a common terminal for each emitter and the output terminals (U, V, III), the number of terminals can be reduced and the cost can be reduced.

(Problem to be Solved by the Invention) The conventional transistor module 10 shown in FIG. 4 shares the emitters of transistors TR2, TR4, and TR6, and
Since the two terminals (N) are commonly used, there are problems as described below.

This problem will be explained based on FIG. 6, taking the transistor TR2 as an example. The output of the Haas drive circuit 6B that drives the transistor TR2 is the transistor module l.
The 82nd terminal and the N terminal are connected to the 82nd terminal and the N terminal of the Inductance (f13, f14) is generated in the circuit connecting the live circuit 6B and the transistor TR2. The effect of this inductance I1.3, 12a causes a delay in the Hass signal actually applied to the transistor chip inside the module, and the switching speed of the transistor becomes slower than the speed that the transistor chip normally has. This has the disadvantage of causing problems. Moreover, the inductance value shown in FIG.

11a, a discontinuous current with a high rate of change (di/dt) flows as the transistor switches, so a high surge voltage (e-ρ・di /dt), resulting in disadvantages such as the transistor chip being easily destroyed by overvoltage.

That is, there is an increasing demand for smaller size and higher reliability of inverters, and in order to meet these demands, transistor modules in which transistors constituting an inverter are integrated into one package have been put into practical use (for example, a 6-inch! module). In order to reduce the number of terminals in conventional transistor modules, emitters and the like that are connected to each other are made into one common terminal. However, by sharing the terminals in this way, the inductance of the emitter line of each transistor increases, which affects the operating characteristics and has the disadvantage that the original performance of the transistor cannot be achieved.

The present invention was made in view of the above-mentioned circumstances, and an object of the present invention is to reduce the internal inductance in a transistor module with an internal circuit as shown in FIG.
It is an object of the present invention to provide a transistor module and an inverter device using the same, which share emitter terminals and the like without impairing transistor characteristics and obtain good characteristics with a minimum number of terminals.

(Means for Solving the Problems) The present invention relates to a transistor module. and a conductor placed through each vicinity of the base terminal and connected to an emitter terminal common to each of the transistors. Further, the other transistor module includes a first transistor group whose emitters are connected to each other, a second transistor group whose collectors are connected to each other, and a common emitter terminal that connects each emitter of the first transistor group. the first connected to
and the respective collectors of the second transistor group and are connected to a common collector terminal, and the conductor of the first
The inverter device of the present invention is equipped with the above-described transistor module, uses the transistor module, and connects each terminal of the transistor module with a second conductor arranged adjacent to and parallel to the second conductor. In an inverter device including a printed circuit board connected by a wiring pattern, a section from a pace drive circuit that drives the transistor to a vicinity of a base terminal of the transistor module is adjacent to a base signal wiring pattern output from the base drive circuit. The section extending from the vicinity of the base terminal to the common emitter terminal is achieved by providing an emitter signal wiring pattern arranged parallel to the conductor connecting each of the emitters.

(Function) The transistor module of the present invention has a conductor that is located inside the transistor module, connects each emitter through the vicinity of each base terminal, and is connected to a common emitter terminal, and a conductor that is located on the printed circuit board and connects each emitter through the vicinity of each base terminal. Since the emitter signal wiring patterns arranged parallel to the conductor are close to each other and parallel to each other, they act to cancel each other's inductance. In other words, the emitter signal line output from the base drive circuit is wired from the vicinity of the base terminal to the common emitter terminal located at a distance by the emitter signal wiring pattern, but it is immediately folded back by the conductor directly under this pattern and connected to the base. Since it returns to the vicinity of the terminal, the inductance during this period can be made extremely small. Additionally, between the base drive circuit and the base terminal, the inductance can be reduced by arranging the base signal wiring pattern and emitter signal wiring pattern next to each other in parallel, so that the inductance can be reduced from the base drive circuit to the transistor chip. Wiring with extremely low inductance can be realized.

According to the present invention, since a plurality of transistors can be integrated and the number of terminals can be reduced, the number of work steps can be reduced, and a small inverter device with excellent reliability can be realized.

(Example) An actual TJ'm example of the present invention will be explained below.

FIG. 1 shows an external view of a transistor module according to the present invention and an example of a mounting wiring diagram when wiring it as an inverter. In the figure, the terminal arrangement of transistor module 1 is 4th.
This is the same as the conventional example shown in the figure. Further, wiring for these terminals is realized by a printed circuit board 2, and the internal circuit of this moshul is similar to the circuit shown in FIG.

In FIG. 1, the part indicated by numeral 3 is the transistor TR.
2, TR4, and Tl16, and each base terminal B2. It is placed passing near B4 and 86. Furthermore, an emitter signal wiring pattern 4 is provided on the printed circuit board 2 so as to be just above and parallel to the conductor 3 connecting each emitter. FIG. 2 shows an example of the internal wiring structure of the transistor module 1. As shown in Figure 2, transistors TR2, TR
The conductor 3 connecting each emitter of 4TR6 is connected to each base terminal 82 . Each emitter is connected at a position approximately at the same height as B4, 86 (that is, on a nearby plane). Further, the wiring from the chip of each transistor to the connection portion of each emitter of the conductor 3 is designed to be wired in parallel with the wiring of the base terminal as shown in the figure.

With such an internal wiring structure, for example, regarding the transistor TR2, if the emitter signal and base signal output from the base drive circuit can be connected to the part indicated by ■ and the B2 terminal, the adverse effects caused by the internal inductance as described above can be avoided. It does not occur, but in order to connect the emitter signal at part 0, you will need to increase the number of terminals.
This is contrary to the purpose of the present invention. Therefore, as shown in FIG. 1, an emitter signal wiring pattern 4 is provided on the printed circuit board 2 immediately above the 0 section, and the emitter signals output from each base drive circuit are connected at the 0 section. The wiring route between parts 0 and 0 is the route ■ part - N @ child - ○ part, and although the physical wiring length is long, the inductance is low because the wiring is turned back and parallel between them. is extremely small. Therefore, the emitter signal connected to the 0 part is equivalent to being connected to the 0 part.

Further, FIG. 3 shows a transistor module 1 according to the present invention.
Another example of the internal wiring structure is shown below. In this example, the conductor 3 connecting each emitter and each base terminal 82,414
, BS and each transistor chip are wired using twisted pair wires 8. The purpose is to reduce the inductance from the zero section to the tip of the transistor. However, in this case, as is clear from FIG. 3, the wiring for the emitter of each transistor has two routes, one using the plate-shaped conductor 3 and the other using the twisted pair wire 8. Therefore, the emitter current that originally flowed through the plate-shaped conductor 3 may flow through the twisted pair wire 8. As a countermeasure for this, as shown in Figure 3, twist the M8 to the ferrite ring core 7.
It is effective to pass the current through the twisted pair wire 8 to only the signal current.

In this embodiment, the conductors connecting the collectors of the transistors TRI, TR3, and TR5 are also connected to the conductor 3, which connects the emitters, as shown by the reference numeral 5 in FIG. Since the terminals are arranged parallel to each other and adjacent to each other, the internal inductance between the P terminal and the N terminal can be made extremely small. Note that although the structure according to the present invention allows the internal inductance to be extremely small,
Unfortunately, it is difficult to eliminate it completely. Therefore, high-speed and high di
When using a transistor that can realize /dt,
The very small amount of inductance that remains causes the above-mentioned problems. In order to solve this problem, rG
Adjust the value of the gate resistance connected in series to the gate of BT or MOS-FET according to the arrangement of the transistor (
Countermeasures such as IGBTs and MOS-FETs whose switching speeds can be varied by adjusting the gate resistance are required.

(Effects of the Invention) As described above, according to the present invention, in a transistor module having a plurality of built-in transistors, it is possible to reduce the number of terminals to a minimum by making the terminals common, thereby affecting the operating characteristics of the transistors. This can be achieved without giving any. As a result, it is possible to realize an inverter device that is compact and highly reliable due to high integration, and that also maintains performance.

[Brief explanation of the drawing]

FIG. 1 is an external view of a transistor module according to the present invention and a mounting wiring diagram when wiring it as an inverter, FIG. 2 is a diagram showing an example of the internal wiring structure of a transistor module according to the present invention, and FIG. 3 is a transistor module according to the present invention. A diagram showing another example of the internal wiring structure of a module, FIG. 4 is an external view of a prior art transistor module to which the present invention is applied, FIG. 5 is an internal circuit thereof, and FIG. FIG. 1. IO...Transistor module, 2...Printed circuit board, 3...Conductor, 4...Emitter signal wiring pattern 5...Conductor connecting each collector, 6A, 6B Base drive circuit, 7. ...Fuerairingco8...Twisted pair wire.

Claims (1)

[Claims] 1. A plurality of transistors whose emitters are connected to each other, and each emitter of the transistors is connected on the same plane or in the vicinity of each base terminal of the transistors, and each of the emitters of the transistors is connected to each other in the vicinity of each base terminal. a conductor disposed through the transistor and connected to an emitter terminal common to each of the transistors. 2. Each of the terminals is provided on a convex portion formed on the top surface of the module, the conductor connecting each emitter is covered with an insulating material, and the height of the conductor including the insulating material is equal to the convex portion. 2. The transistor module according to claim 1, wherein the transistor module is arranged at the same height as the top surface of the transistor module. 3. A first transistor group whose emitters are connected to each other, a second transistor group whose collectors are connected to each other, and a first transistor group whose emitters are connected to each other and connected to a common emitter terminal. and the second conductor.
A transistor module comprising: a second conductor that connects the collectors of the transistor groups and is connected to a common collector terminal, and that is arranged adjacent to and parallel to the first conductor. 4. An inverter device that uses the transistor module according to claim 2 or 3 and includes a printed circuit board that connects each terminal of the transistor module by a wiring pattern, in which a base drive circuit for driving the transistor is connected to the transistor module. The section extending from the vicinity of the base terminal is arranged adjacent to and parallel to the base signal wiring pattern output from the base drive circuit, and the section extending from the vicinity of the base terminal to the common emitter terminal is arranged parallel to the base signal wiring pattern output from the base drive circuit. An inverter device comprising an emitter signal wiring pattern arranged parallel to a conductor to be connected.