JPH037075A - Transistor module - Google Patents

Abstract

PURPOSE:To obtain a small and simple control circuit for mounted equipment by providing a plurality of transistors and drive circuits and a power source, and inverting DC input voltage into AC output voltage through switching of respective transistors. CONSTITUTION:A plurality of transistors 11-16, a plurality of drive circuits 18, 21-33, and a power source 35 are provided, and DC input voltage is inverted into AC output voltage through switching of the transistors 11-16. The drive circuit 18 for amplifying the driving voltage in response to turn ON of the output side element of a photocoupler 17, for example, is extended such that the base-emitter of the power transistor 11 is connected to the output end of the drive circuit 19 18 thus forming an integral module 10.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a transistor module used in an air conditioner or the like.

(Prior Art) Generally, an air conditioner is equipped with a variable capacity compressor and an inverter circuit that supplies drive power to the compressor, and controls the output frequency of the inverter circuit according to the air conditioning load. Obtain the optimal ability to respond to
Some aim to improve comfort and energy saving effects.

As an inverter circuit used in such an air conditioner, for example, a transistor module shown in FIG. 5 or FIG. 6 is used.

First, in FIG. 5, reference numeral 1 denotes a transistor module. The transistor module 1 has a plurality of power transistors, and is configured to convert an input DC voltage into an AC voltage of a predetermined frequency and output it. This transistor module 1 is connected to a control circuit 2.

The control circuit 2 has a drive circuit 3 that drives each power transistor of the transistor module 1 on and off, and also has a power supply circuit 4 that provides an operating voltage to the drive circuit 3, and provides commands to the drive circuit 3. Each power transistor of the transistor module 1 is turned on and off at a predetermined timing to cause the transistor module 1 to output an alternating current voltage of a predetermined frequency.

On the other hand, the inverter circuit shown in FIG. 6 includes a transistor module 5 with a built-in drive circuit and a control circuit 6.

The transistor module 5 has a plurality of power transistors and a drive circuit 3 for turning on and off the power transistors, and converts a human-powered DC voltage into an AC voltage of a predetermined frequency and outputs the AC voltage.

The control circuit 6 has a power supply circuit 7 that applies an operating voltage to the drive circuit of the transistor module 5, and gives a command to the drive circuit of the transistor module 5 to turn on each power transistor of the transistor module 5 at a predetermined timing. It is turned off and causes the transistor module 5 to output an AC voltage of a predetermined frequency.

(Problem to be Solved by the Invention) By the way, the transistor module 1 or the transistor module 5 as described above both require an external power supply circuit, which increases the number of wires and complicates the control circuit of the mounted equipment. This may cause problems such as.

This invention was made in view of the above circumstances, and its purpose is to reduce the number of wires by eliminating the need for an external power supply circuit, thereby simplifying the control circuit of the onboard equipment. The object of the present invention is to provide a transistor module that can be reduced in size and size, and furthermore, can improve the safety of high voltage protection.

[Structure of the Invention (Means for Solving the Problems) This invention comprises a plurality of transistors, a drive circuit that drives these transistors on and off, a power supply circuit that supplies an operating voltage to the drive circuit, and a power supply circuit. The input DC voltage is converted into an AC voltage by switching of each of the transistors and output.

(Function) A plurality of transistors, a drive circuit, and a power supply circuit are integrated as one module.

(Example) Hereinafter, a first example of the present invention will be described with reference to the drawings.

In FIG. 1, 10 is a transistor module, and this transistor module 10 has a collector common terminal (positive side terminal) P and an emitter common terminal (negative side terminal) N, to which a DC voltage is applied, led out. Further, a switching common terminal COM, and input terminals Iu, Iv, and Iw to which switching pulse voltages Va are respectively applied between the switching common terminal COM and the switching common terminal COM.
.

lx, Iy, and Iz are derived outside.

Inside the transistor module 10, the collectors and emitters of power transistors 11 and 12 are connected in series, and the series circuit is connected between the terminals P and N. The collectors and emitters of the power transistors 13 and 14 are connected in series, and the series circuit is connected between terminals P and N. Power transistor 15.1
6 are connected in series between their collectors and emitters, and the series circuit is connected between terminals P and N.

A connection point between the emitter of the power transistor 11 and the collector of the power transistor 12 is led out as an output terminal Ou. A connection point between the emitter of the power transistor 13 and the collector of the power transistor 14 is led out as an output terminal Ov. A connection point between the emitter of the power transistor 15 and the collector of the power transistor 16 is led out as an output terminal Ow.

Further, a drive circuit 18 is provided which amplifies and outputs the drive voltage in response to turning on of the output side element of the photocoupler 17, and the base of the power transistor 11 is connected to the output terminal of the drive circuit 18.
Connects between emitters.

The input side element of the photocoupler 17 is connected between the terminals COM and Iu via a resistor 19. A drive circuit 21 is provided which amplifies and outputs a drive voltage in response to turning on of the output side element of the photocoupler 20, and the output terminal of the drive circuit 21 is connected between the base and emitter of the power transistor 12.

The input side element of the photocoupler 20 is connected between the terminals COM and lx via a resistor 22.

A drive circuit 24 is provided which amplifies and outputs a drive voltage in response to turning on of the output side element of the photocoupler 23, and the drive circuit 2
The base and emitter of a power transistor 13 are connected to the output terminal of the power transistor 4. The input side element of the photocoupler 23 is connected between the terminals COM and Iv via a resistor 25.

A drive circuit 27 is provided which amplifies and outputs a drive voltage in response to turning on of the output side element of the photocoupler 26, and the drive circuit 2
The base and emitter of a power transistor 14 are connected to the output terminal of the power transistor 7. The input terminal element of the photocoupler 26 is connected between the terminals COM and Iy via a resistor 28.

A drive circuit 30 is provided which amplifies and outputs the drive voltage in response to turning on of the two output side elements of the photocoupler, and the drive circuit 3
The base and emitter of the power transistor 15 are connected to the output terminal of the power transistor 15. The input side element of the photocoupler 29 is connected between the terminals COM and Iw via a resistor 31.

A drive circuit 33 is provided which amplifies and outputs a drive voltage in response to turning on of the output side element of the photocoupler 32.
The base and emitter of a power transistor 16 are connected to the output terminal of the power transistor 3. The input side element of the photocoupler 32 is connected between the terminals COM and Iz via a resistor 34.

Furthermore, a power supply circuit 35 is connected between terminals P and N.

This power supply circuit 35 is a DC-DC converter that converts a DC voltage applied between terminals P and N into a DC voltage of a predetermined level, and has four windings and a rectifier circuit that are insulated from each other on the output side. ing.

That is, the power supply circuit 35 has an output line +a for supplying operating voltage to the drive circuit 18 .

-a, output line +b for supplying operating voltage to the drive circuit 24, -b, output line 10C, -c for supplying operating voltage to the drive circuit 30;

It has common output lines +d and -d for supplying operating voltage to the drive circuits 21, 27, and 33.

Explain the operation.

Assume that a DC voltage is now being applied between terminals P and N.

In addition, a control circuit (not shown) controls the terminal COM and terminal 1.
Switching pulse voltage Va between u, Iv, and Iw
are sequentially applied with a phase difference of 180'', and a switching pulse voltage Va synchronized with the level inversion is sequentially applied between the terminal COM and the terminals lx, Iy, and Iz.

That is, when the voltage Va is applied between the terminals COM and Iu, the voltage Va is not applied between the terminals COM and lx,
The photocoupler 17 is turned on and the photocoupler 20 is turned off. In this case, the drive voltage of the drive circuit 18 is supplied between the base and emitter of the power transistor 11, and the power transistor 11 is turned on. After this, terminal COM, Iu
The voltage Va is no longer applied between the terminals COM and COM.
, lx, the photocoupler 17 is turned off and the photocoupler 20 is turned on. In this case, the drive voltage of the drive circuit 21 is applied to the base of the power transistor 12.
The signal is supplied between the emitters, and the power transistor 12 is turned on.

When the voltage Va is applied between the terminals COM and Iv, the voltage Va is not applied between the terminals COM and Iy, and the photocoupler 23 is turned on and the photocoupler 26 is turned off. In this case, the drive voltage of the drive circuit 24 is
The power transistor 13 is turned on. After this, voltage V between terminals COM and Iv
a is no longer applied, and a voltage Va is instead applied between the terminals COM and Iy, and the photocoupler 23 is turned off and the photocoupler 26 is turned on. In this case, the drive voltage of the drive circuit 21 is supplied between the base and emitter of the power transistor 14, and the power transistor 14 is turned on.

When the voltage Va is applied between the terminals COM and Iw, the voltage Va is not applied between the terminals COM and Iz, and the photocoupler 28 is turned on and the photocoupler 31 is turned off. In this case, the drive voltage of the drive circuit 29 is
is supplied between the base and emitter of the power transistor 15, and the power transistor 15 is turned on. After this, voltage V between terminals COM and Iw
a is no longer applied, and instead a voltage Va is applied between the terminals COM and rz, and the photocoupler 28 is turned off and the photocoupler 31 is turned on. In this case, the drive voltage of the drive circuit 21 is supplied between the base and emitter of the power transistor 16, and the power transistor 16 is turned on.

In this way, the DC voltage applied between the terminals P and N is converted into a three-phase AC voltage of a predetermined frequency and level by turning on and off each power transistor, and the output terminals Ou and Ov
, Ow.

According to such a transistor module 10, the plurality of power transistors, the plurality of drive circuits, and the power supply circuit are integrated as one module, so there is no need to provide an external power supply circuit, and the number of wirings between the external circuits can be reduced. It is possible to simplify and downsize the control circuit of on-board equipment, such as an air conditioner. Moreover,
The high voltage switching part will be molded,
Therefore, the safety of high voltage protection can be greatly improved.

Next, regarding the second embodiment of the present invention, FIGS.
This will be explained using figures. In the drawings, the same parts as in FIG. 1 are designated by the same reference numerals, and detailed explanations will be omitted.

As shown in FIG. 2, inside the transistor module 10, a shunt resistor 36 for current detection is inserted into the main circuit line on the terminal N side, and an abnormality detection circuit 37 is connected to both ends of the shunt resistor 36. . Furthermore, terminal CO
The emitter-collector of a PNP transistor 38 is connected to the connection line between M and all photocouplers.

A specific example of the abnormality detection circuit 37 is shown in FIG.

The voltage generated in the shunt resistor 36 is supplied to a delay circuit (integrator circuit) 42 via an amplifier circuit 41.

This delay circuit 42 sets the output to a low level only when the increase in the output voltage of the amplifier circuit 41 is large and this state continues, and otherwise sets the output to a high level.

A DC voltage V is applied to the light emitting diode 43a of the photocoupler 43 via the output end of the delay circuit 42. A DC voltage V is applied to the resistor 44 between the collector and emitter of the phototransistor 43b of the photocoupler 43, and the resistor 44
The voltage generated in the flip-flop circuit 45 is supplied to the set input terminal of the flip-flop circuit 45.

The output terminal of the flip-flop circuit 45 is connected to the base of the transistor 38 and also connected to the output terminal o1 via the inverter circuit 46. Further, the reset input terminal of the flip-flop circuit 45 is connected to the input terminal 11.

Explain the operation.

A voltage corresponding to the level of the main circuit current is output from the amplifier circuit 41.

When the main circuit current is at the presentation level, the output voltage of the amplifier circuit 41 is low, and therefore the output of the delay circuit 42 is at a high level. In this case, the flip-flop circuit 45 is reset, and the reset output causes the transistor 38 to remain on.

Therefore, each power transistor is turned on and off, and an alternating current voltage is output.

However, if the main circuit current becomes excessive for some reason, the output of the delay circuit 42 becomes low level, and the light emitting diode 4
3a emits light and the phototransistor 43b is turned on.

Then, a voltage is generated in the resistor 44, and the flip-flop circuit 45 is set by the voltage.

The set output of the flip-flop circuit 45 is inverted by the inverter circuit 46, the transistor 38 is turned off, and the output terminal 0. An abnormality is notified to external control circuits etc. through the In this case, by turning off the transistor 38, the on/off driving of each power transistor is prohibited, and the equipment is protected.

When a protection release signal is input to the input terminal 11 from a control circuit or the like, the flip-flop circuit 45 is reset.

As a result, the transistor 38 is turned on, and the on/off driving of each power transistor can be restarted.

In the case of this embodiment, not only multiple power transistors, multiple drive circuits, and power supply circuits, but also a protection function against abnormalities are integrated into one module, which further simplifies and downsizes the external configuration. There is an advantage to doing so.

A third embodiment of the invention is shown in FIG. In the drawings, the same parts as in FIGS. 1 and 2 are designated by the same reference numerals, and detailed explanations will be omitted.

Here, instead of the power transistor, a gate drive element with low drive power, such as a power MOS FET-IGBT, is used.
51, 52, 53, 54, 55°56 are used. With this adoption, ■GBT drive circuit 57.5g,
59, 60, 61°62 are provided, and a power supply circuit 63 of negative series output is provided.

For the drive circuit on the collector common side of each drive circuit, the output voltage of the power supply circuit 63 is connected to the diode 64.
, 66, and 68 to capacitors 65, 67, and 69, respectively, and the voltage of capacitors 65, 67, and 69 is taken in as an operating voltage. For the remaining drive circuits on the emitter common side, the output voltage of the power supply circuit 63 is directly taken in as the operating voltage.

That is, multiple IGBTs, multiple drive circuits, and a power supply circuit are integrated as one module, and as in the first and second embodiments, the external configuration is simplified and miniaturized, and the high voltage protection Effects such as increased safety can be obtained.

In addition, the present invention is not limited to the above-mentioned embodiments, and various modifications can be made without changing the gist.

[Effects of the Invention] As described above, according to the present invention, since it is composed of a plurality of transistors, a drive circuit that drives these transistors on and off, and a power supply circuit that supplies an operating voltage to this drive circuit, external It is possible to reduce the number of wiring by eliminating the need for a power supply circuit, thereby making it possible to simplify and downsize the control circuit of the installed equipment, and furthermore, to provide a transistor module that makes it possible to improve the safety of high voltage protection. .

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of a first embodiment of the invention, FIG. 2 is a diagram showing the configuration of a second embodiment of the invention, and FIG. 3 is a diagram showing the structure of the abnormality detection circuit 10 in the same embodiment.・Transistor module, 11, 12° 13.14, 15.16...
・Power transistor, 18.21, 24. ．． 27,3
0.33... Drive circuit, 35... Power supply circuit.

Claims (1)

[Claims] It consists of a plurality of transistors, a drive circuit that drives these transistors on and off, and a power supply circuit that supplies operating voltage to this drive circuit, and converts the input DC voltage into AC voltage by switching each of the transistors. Transistor module that outputs.