JP2003324971A - Inverter device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inverter device which can be easily adapted to direct- current power receiving operation and sufficiently obtains the advantages of centralized direct-current power supply method. <P>SOLUTION: A smoothing capacitor 2 and components, such as a control power circuit, unnecessary for direct-current power receiving operation are mounted on a main circuit board 12. When the inverter device is applied to direct-current power receiving operation, instead of the above main circuit board 12, a main circuit board mounted with substantially only a terminal block 8 is loaded on a main circuit element module 10. Thus, the inverter device can be applied to centralized direct-current power supply method to sufficiently obtain the advantages thereof. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inverter device in which a circuit board on which a control circuit is mounted is incorporated in a main circuit semiconductor module, and in particular, an inverter of a type which supplies operating power of the control circuit from a DC input of an inverter section. Regarding the device.

[0002]

2. Description of the Related Art In recent years, an inverter device has been widely used for driving an induction motor. Here, in the case of such a general-purpose inverter device, its circuit is composed of a main circuit system,
It is generally roughly divided into control circuit systems for controlling this.

First, since the main circuit system is premised on an AC power receiving operation, as shown in FIG. 3, a converter circuit 1 composed of a diode bridge, a smoothing capacitor 2, and an IGBT (insulated gate bipolar transistor). It is generally composed of an inverter circuit 3 including a switching element such as) and a flywheel diode.

At this time, as a general-purpose inverter device, a resistor RS and an inrush current prevention circuit 4 in which a contact of an electromagnetic relay or a thyristor is connected in parallel to the resistor RS are also provided.
As shown, it is included in the main circuit system.

From the commercial power source, input terminals R, S, T
After converting the three-phase AC power supplied via the converter circuit 1 into DC power in the converter circuit 1, the smoothing capacitor 2 smoothes it, and the smoothed DC power is converted into three-phase AC power by the inverter circuit 3 and output. The induction motor IM, which is a load, is supplied and driven via terminals U, V, and W.

Next, although not shown, the control circuit system is generally composed of a control circuit and a control power supply circuit (power supply circuit for the control circuit). For this, a DC-DC converter that operates by inputting a DC voltage appearing between the terminals of the smoothing capacitor 2 of the main circuit system is generally used.

By the way, in such a general-purpose inverter device, in a comparatively small capacity inverter device of, for example, 10 KW or less, in recent years, the semiconductor elements of the converter circuit 1 and the inverter circuit 3 of the main circuit system have been modularized. Control board (circuit board with peripheral circuits such as control circuits)
Conventionally, an inverter device to which the is attached is known.

FIG. 4 shows an example of such an inverter device according to the prior art. In the figure, 5 is a main circuit element module, and the bottom plate portion is made thick by synthetic resin such as PPS (polyphenylene sulfide). It is formed in a shallow box shape, and the diode bridge of the converter circuit 1 described in FIG. 3 and the switching element and the diode of the inverter circuit 3 are molded in the bottom plate portion thereof.

A control board 6 is housed in the box-shaped portion of the main circuit element module 5 as shown in the figure, and the control board 6 controls the switching elements forming the inverter circuit 3. The control circuit, the logic circuit, the communication circuit, etc. are mounted on the control board 6. At this time, a control power supply circuit for supplying the power necessary for operating these circuits is also mounted on the control board 6. However, regarding this control power supply circuit, in this figure, the transformer 6
It is represented by 0.

Reference numeral 7 denotes a main circuit board, on which a smoothing capacitor 2, an inrush current prevention circuit 4, and a terminal block 8 are mounted, and as shown in the drawing, the main circuit element module 5 of the main circuit element module 5 is provided above the control board 6. It is attached so as to cover the box-shaped part.

At this time, although not shown, the terminal block 8
Is provided with terminals R, S, T of the commercial power supply shown in FIG. 3 and terminals U, V, W on the load side, and other necessary terminals such as for control circuits and communication circuits. It is what

Next, the flow of the main circuit current between the main circuit element module 5 and each substrate in the inverter device shown in FIG. 4 will be described. Here, the wiring between the main circuit element module 5 and the control board 6 and the main circuit board 7 at this time is provided through the plurality of main circuit terminals 50 provided in the main circuit element module 5. Has become.

First, in a normal use state, that is, in the AC power receiving operation, the commercial power source receives power via the terminal block 8 of the main circuit board 7, and then enters the converter circuit 1 in the main circuit element module 5. It is introduced and rectified here by diodes in a bridge connection.

Then, the rectified DC voltage is guided to the main circuit board 7 again, and the smoothing capacitor 2 is charged through the inrush current prevention circuit 4 mounted therein. And
The DC voltage smoothed here is the main circuit element module 5
After being converted to AC by the switching element of the inverter circuit 3, it is returned to the main circuit board 7 again and supplied to the terminals U, V, W of the terminal block 8.

At this time, a part of the DC voltage appearing between the terminals of the smoothing capacitor 2 is branched to the control board 6 and supplied to the control power supply circuit arranged therein to generate a DC voltage of a predetermined voltage. The electric power is supplied to the control circuit and the like included in the inverter device itself.

Here, in an environment where a plurality of induction motors driven by an inverter device are used in a relatively integrated state, a plurality of inverter devices may be housed and used in the same switchboard.

In such a case, there is a so-called centralized DC power supply system in which the inverter device is operated by a DC power supply, and DC power is supplied to a plurality of inverter devices from a common power supply at this time. According to
It is expected that commonality will reduce device costs, reduce size, and improve power efficiency.

At this time, there is also a method of concentrating not only the DC power supply of the main circuit but also the power supply of the control circuit system. In this case, the device cost is reduced and the size is reduced by the centralization, and the power efficiency is improved. It can be expected that the improvement will be even greater.

For example, when five 5 KW inverter devices are installed, the capacity of the DC power supply is not 5 KW × 5 units = 25 KW, depending on the operation mode of the induction motor.
This is because 50% to 80% may be sufficient, and improvement in efficiency and volume control by unifying the power supply device can be expected.

Further, according to this DC power supply system, since the aluminum electrolytic capacitor for the main circuit power supply, which is a life component in the inverter device, is not provided on the inverter device side, the life of the inverter device can be extended. As a result, there is an advantage that the system down time for the inverter maintenance can be shortened, and further, since there is no replacement work of the smoothing capacitor, there is an advantage that an error such as an incorrect connection when the smoothing capacitor is replaced is less likely to occur. .

As a known example related to this type of apparatus, for example, the disclosure of Japanese Patent Application Laid-Open No. 11-122946 can be cited.

[0022]

The above-mentioned prior art cannot be said to consider the centralization of the DC power source of the inverter device, and there is a problem in that the advantages of the centralization can be fully enjoyed.

That is, when the DC power source is centralized, the inverter device is in the operating state by the DC power feeding, that is, the DC receiving operation state, so that the AC-DC conversion by the converter circuit becomes unnecessary. As will be explained, this point is not taken into consideration, so that no sufficient advantage can be obtained.

First, when the DC power receiving operation is performed, it is typical that the components arranged inside the inverter device become unnecessary, the converter circuit 1 and the capacitor 2 for smoothing the DC voltage, and inrush current prevention. There is a circuit 4. Also,
When centralized including the power supply of the control circuit system, the control power supply circuit represented by the transformer 60 is also included.

However, in the prior art, these have already been mounted as general-purpose products on the premise of AC power receiving operation and cannot be easily removed. Therefore, there is no choice but to directly perform DC power receiving operation, in which case the parts are wasted. In addition to the fact that it is wasteful even if it is removed, in this case, it takes extra effort, and not only the cost is reduced, but the cost is increased. There is a problem in fully enjoying the benefits.

It is an object of the present invention to provide an inverter device capable of easily accommodating both an AC power receiving operation and a DC power receiving operation without waste, and making it possible to sufficiently obtain the advantages of the DC power supply centralized supply system. .

[0027]

SUMMARY OF THE INVENTION The above object is to provide an inverter device having a circuit board in a main circuit element module, wherein the circuit board is divided into a plurality of circuit boards, and operation by AC power reception and operation by DC power reception are performed. Corresponding switching is achieved in such a way that only one circuit board of the plurality of circuit boards can be replaced.

[0028] Similarly, the above object is required in an inverter device having a circuit board in a main circuit element module, in which case circuit components to be mounted on the circuit board are used for both the AC power receiving operation and the DC power receiving operation. Circuit components and circuit components that are unnecessary in the case of operation by DC power reception, and the circuit board is also divided into a control circuit board and a main circuit board, and either the operation by AC power reception or the operation by DC power reception is performed. In the above case, the necessary circuit components are mounted on the control circuit board, and the circuit components that are unnecessary in the case of the operation by the DC power reception are also mounted on the main circuit board.

[0029]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the inverter device according to the present invention will be described in detail with reference to the illustrated embodiment. First, FIGS. 1 and 2 are one embodiment of the inverter device according to the present invention. Shows a case where a normal general-purpose inverter device is used instead of the DC power supply centralized supply, and FIG.
Shows the case where it is applied to DC power supply in a centralized manner.

In these figures, 10 is a main circuit element module, 11 is a control board, and 12 and 13 are main circuit boards. Here, a smoothing capacitor 2, an inrush current prevention circuit 4, and a terminal block are provided. 8 is the same as the prior art of FIG.

At this time, the main circuit board 12 of FIG. 1 is compatible with a general-purpose inverter device, and the main circuit board 13 of FIG. 2 is compatible with DC power supply centralized supply. Reference numeral 14 denotes a connector, which is a connector for receiving the power supply of the control circuit system.

First, the main circuit element module 10
Is basically the same as the main circuit element module 5 in the prior art of FIG. 4, except that the screw fixing portions 101, 102,
103 are provided at three locations, and a notch 105 is formed which is recessed from a bottom surface portion 104 that is brought into contact with the bottom heat radiation fin.

Therefore, these screw fixing portions 101, 10
When the bottom surface portion 104 is fixed to the radiating fins (not shown) by the elements 2 and 103 in a state of being in contact with each other, a part of the bottom surface of the main circuit element module 10 is attached to the radiating fins by the notch portion 105. It is configured to be away from the surface.

Next, the control board 11 is basically the same as the control board 6 in the prior art shown in FIG. 4, and has a control circuit for controlling the switching elements of the inverter circuit 3, a logic circuit, and a communication circuit. Etc. are installed.

However, this control board 11 is not equipped with a control power supply circuit, and is not equipped with a transformer included in this circuit. Instead, the control board 11 has a terminal group 10 for connection to the main circuit board 12.
6, 107 are provided.

As a result, the control board 11 is
The area can be made smaller than that of the control board 6 in the related art of FIG. 4, and therefore, as shown in FIG. 1, in the main circuit element module 10, a space is easily formed on the bottom surface portion 104. It is supposed to be left behind.

Next, the main circuit board 12 is basically the same as the main circuit board 7 in the prior art shown in FIG. 4, and the smoothing capacitor 2, the inrush current prevention circuit 4, and the terminal block 8 are provided.
In the case of the main circuit board 12, a control power supply circuit including a transformer 60 is further mounted.

Next, the main circuit board 13 shown in FIG.
The main circuit board 12 shown in FIG.
This is largely different from the main circuit board 7 in the prior art, and almost only the terminal block 8 is mounted. Instead, a connector 14 is mounted so that the power source for the control circuit can be connected to the circuit pattern provided on the main circuit board 13 from the outside.

Here, the embodiment shown in FIGS. 1 and 2 can be commercialized as an ordinary general-purpose inverter device, or as an inverter device compatible with centralized DC power supply. This is as described above, but this point will be described in more detail.

First, when the inverter device according to this embodiment is operated by receiving commercial power, that is, when a product compatible with a general-purpose inverter device is requested, the main circuit board 12 shown in FIG. Attach to.

Then, in this case, the connection between the main circuit element module 10 and the main circuit board 12 is given by the plurality of main circuit terminals 50, and the connection between the control board 11 and the main circuit board 12 is the terminal. Provided by groups 106, 107.

At this time, the DC main circuit from the terminal 50 to the smoothing capacitor 2 is branched, and the DC voltage of the main circuit is supplied to the control power supply circuit mounted on the main circuit board 12. As a result, the control power supply circuit including the transformer 60 generates power for the control circuit system, and the terminal group 106,
It is adapted to be supplied to the wiring pattern of the control board 11 via 107.

Therefore, in this case, that is, in the case of FIG.
Connect the wiring from the commercial power source to the AC input terminal R in the terminal block 8,
By connecting to S and T and connecting an induction motor to terminals U, V, and W, it can be used as a general-purpose inverter device.

Next, when the inverter device according to this embodiment is required as a product compatible with centralized DC power supply including the power supply for the control circuit system, the main circuit board 1 shown in FIG.
3 is attached to the main circuit element module 10.

In this case, among the wires from the common power source, the wires from the DC main power source are connected to two terminals in the terminal block 8, that is, the DC input terminals, and the wires from the DC power source for the control circuit are connected. The wiring is connected to the connector 14 by connecting the wiring to a plug (not shown) and then inserting the plug into the connector 14.

Then, the DC main power supplied to the DC input terminal of the terminal block 8 is guided to the main circuit element module 10 through the main circuit terminal 50, and as a result, the inverter circuit 3
DC will be directly supplied to the DC input of.

The DC power supply for the control circuit supplied to the connector 14 is guided to the control board 11 via the terminal groups 106 and 107, and as a result, the peripheral parts of the control circuit and the like mounted on the control board 11 are provided. The circuit will be supplied with direct current for the control circuit.

Therefore, in this case, that is, in the case of FIG.
Connect the wiring from the common DC main power supply to the two DC input terminals of the positive (+) pole and the negative (-) pole on the terminal block 8, and connect the induction motor to the output terminals U, V, W of the three-phase AC. By connecting the IM, it can be used as an inverter device having a common power source as an input, that is, an inverter device for DC power supply centralized supply.

Therefore, according to the embodiments shown in FIGS. 1 and 2, an inverter of the centralized DC power supply system by DC power reception can be used as a general-purpose inverter device by AC power reception only by selecting the main circuit boards 12, 13. It can be easily applied to a device.

According to this embodiment, the inverter device of the DC power supply centralized supply system is characterized in that the circuit elements which are wasted when it is commercialized are minimized, and therefore the device cost is reduced. It is possible to sufficiently obtain the advantages of the centralized DC power supply, such as downsizing and improvement of power efficiency.

More specifically, when the inverter device according to the prior art described with reference to FIG. 4 is operated by receiving direct current, the AC-DC converting function, the DC voltage smoothing function, and the inrush current preventing function become unnecessary, The function of generating direct current for the control circuit is also unnecessary, so in extreme terms, it suffices if there is a terminal block for receiving the direct current main circuit power supply and the control circuit power supply.

However, in the prior art, even in this case,
There is no choice but to deal with the configuration shown in FIG. 4, which is wasteful, and there is no means for suppressing waste.
Therefore, the advantage of the centralized DC power supply cannot be enjoyed.

Therefore, in the case of the embodiment of the present invention, when the inverter device supports direct current reception, the main circuit board 13 shown in FIG. 2 is selected instead of the main circuit board 12 shown in FIG. it can. Then, by mounting this on the main circuit element module 10, extra circuit elements are eliminated from the beginning, and therefore there is no fear of waste, and as a result, the advantages of the DC power supply can be fully utilized. is there.

Next, the effect of the embodiment described with reference to FIGS. 1 and 2 will be described. First, the inverter device targeted by this embodiment is usually a screw fixing of the main circuit element module 10 in the drawing. It is used in a state where it is vertically attached to a switchboard or the like with the end portion provided with the portion 103 facing upward.

Then, in this embodiment, the main circuit element module 10 is attached to the lower side in the attached state,
The main circuit switching element and the like are housed, and the part is a weight part, and is fixed at two places by screw fixing parts 101 and 102.

This also helps improve the adhesion of the heat dissipation plate installed on the mounting surface of this portion.

On the other hand, in this main circuit element module 10, it means that the portion on the upper side is light. Therefore, here, there is a problem even if it is fixed at one place by the screw fixing portion 103. There will be no.

As a result, when installing the inverter device, the inverter device can be held in a hanging state by simply stopping it at one place on the upper screw fixing portion 103, and then the remaining two points. Screw fixing part 10
It suffices to screw with 1, 102, and mounting is easy and an accurate posture can be easily maintained.

Further, since the screw fixing point on the upper side is provided at one place, as compared with the case where it is provided at two places as in the prior art, the control board which must be mounted inside the main circuit element module 10 is required. 11 can be widened widely, and a margin can be given to the mounting of components.

In the above-described embodiment, the control circuit power supply circuit is mounted on the main circuit board 12, so that the power supply of the control circuit is also centrally supplied when the DC power supply is centrally supplied. It is also possible to leave the control power supply circuit mounted in 11 and supply only the DC main circuit power supply.

[0061]

According to the present invention, switching between a general-purpose general-purpose inverter device and an inverter device compatible with centralized DC power supply can be handled by selecting a circuit board without waste.

Therefore, according to the present invention, both a general-purpose inverter device and a DC power supply centralized supply type inverter device can be easily supported, and the present invention can be applied to the DC power supply centralized supply system.
The advantages can be fully enjoyed.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment in which an inverter device according to the present invention is compatible with a general-purpose inverter.

FIG. 2 is an exploded perspective view showing an embodiment in which the inverter device according to the present invention is adapted to a DC power supply centralized supply type inverter.

FIG. 3 is a circuit diagram showing an example of a main circuit of an inverter device.

FIG. 4 is an exploded perspective view showing an example of a conventional inverter device.

[Explanation of symbols]

1 converter circuit (diode 3-phase bridge circuit) 2 Smoothing capacitor 3 inverter circuit 4 Inrush current prevention circuit 5 Main circuit element module (prior art) 6 control board (prior art) 7 Main circuit board (prior art) 8 terminal block 10 Main Circuit Element Module (Embodiment of the Invention) 11 Control board (embodiment of the present invention) 12 Main circuit board (compatible with general-purpose inverter) 13 Main circuit board (for DC power supply system) 14 connector 50 main terminals (group) 60 transformer (for DC-DC converter of control power supply circuit) 101, 102, 103 screw fixing part 104 Bottom part 105 Notch 106, 107 terminal group

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Masahiro Hiraga             Chiba Prefecture Narashino City Higashi Narashino 7-1-1             Within Hitachi KEE Systems Inc. (72) Inventor Yasushi Sasaki             Chiba Prefecture Narashino City Higashi Narashino 7-1-1             Hitachi Industrial Equipment Systems Co., Ltd. (72) Inventor Tetsuya Kimura             Chiba Prefecture Narashino City Higashi Narashino 7-1-1             Hitachi Industrial Equipment Systems Co., Ltd. (72) Inventor Toru Nakajima             Chiba Prefecture Narashino City Higashi Narashino 7-1-1             Hitachi Industrial Equipment Systems Co., Ltd. F term (reference) 5H007 BB06 CA01 CB02 CB05 CC01                       CC07 DB01 DB09 HA03 HA04                       HA07

Claims (3)

[Claims] 1. An inverter device having a circuit board in a main circuit element module, wherein the circuit board is divided into a plurality of circuit boards, and switching between operation support by AC power reception and operation support by DC power reception is performed by the plurality of circuit boards. An inverter device characterized in that it can be obtained only by exchanging one of the circuit boards of the above. 2. An inverter device having a circuit board in a main circuit element module, wherein the circuit parts to be mounted on the circuit board are necessary for both the AC power receiving operation and the DC power receiving operation. In addition, the circuit board is divided into a control circuit board and a main circuit board, which are not necessary in the case of operation by DC power reception, and the circuit board is also divided into a control circuit board and a main circuit board. An inverter device characterized in that the necessary circuit components are mounted on the control circuit board, and the circuit components that are unnecessary when operating by the DC power reception are mounted on the main circuit board. 3. The inverter device according to claim 1 or 2, wherein the main circuit element module is supported and fixed at three points on a mounting surface of the module.