JPH0735784A - Power converter - Google Patents

Abstract

PURPOSE:To miniaturize a power converter and to rationalize wiring by providing an amplifier built-in type current detector where detection holes for detecting three-phase output current are positioned at the same spacing as the output terminal of an intelligent power module. CONSTITUTION:When rationalize wiring by copper bar wiring, it is necessary to use a linear copper bar as much as possible. The spacing of a detection hole 1 of a current detector for detecting the three-phase output current where the copper bar passes is nearly in the same spacing as the output terminal (for example, U, V, and W terminals) of an intelligent power module. In this manner, by using an amplifier built-in type current detector with the current detection hole 1 with the same spacing and on the same straight line as the output terminal of the module, the copper bar, etc., can be wired easily and the shape of the copper bar does not require any complex machining for reduced cost. Also, installation of the detector and module on the same plane requires that the copper bar for wiring may be in straight line, thus simplifying the shape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a current detector with a built-in amplifier, and more particularly to a current detector with a built-in amplifier which is suitable for downsizing of a power converter and rationalization of wiring.

[0002]

2. Description of the Related Art In a power converter, an output current of the power converter is detected by a current detector with a built-in amplifier as part of a protection function and motor control.

By the way, as a conventional example of such a current detector with a built-in amplifier, a current detector having two output current detection holes for detecting output currents of two phases of U phase and W phase, In order to individually detect the output current in the U phase, V phase, and W phase, a method using a current detector having one output current detection hole for detecting each phase is used. Also,
It has various structures depending on the manufacturer, capacity, etc.

[0004]

The above-mentioned prior art does not consider downsizing of the power converter and rationalization of wiring (for example, when copper bar wiring is used). When wiring the output side through the current detection hole of the detector and reaching the terminal block, it is difficult to perform the shortest wiring of the main elements (intelligent power module, current detector with built-in amplifier, terminal block, etc.). There was a problem.

That is, in the conventional power converters, wiring by electric wires has been the mainstream, and therefore wiring from the intelligent power module to the terminal block is performed by the output terminal of the intelligent power module (for example, U terminal,
V terminal, W terminal) (when detecting three-phase output current) and the current detection hole of the current detector with built-in amplifier, or the above current detection hole and U terminal, V terminal, W terminal of the terminal block are straight There was no need to place it on the line.

However, as the capacity of the power converter increases, the diameter of the wire used for wiring also becomes thicker (for example, 60SQ). Considering the ease of wiring work, the current detection hole and the U terminal, V terminal, and W terminal of the intelligent power module are considered. It is desirable that the terminals be at the same intervals and on the same straight line.

An object of the present invention is to downsize a power conversion device,
When rationalizing the wiring, the amplifier built-in current that has a structure that allows the shortest wiring and rationalization of the output side copper bar wiring from the intelligent power module to the terminal block through the amplifier built-in current detector To provide a detector, or structure thereof.

[0008]

SUMMARY OF THE INVENTION The above-described object is to provide an output terminal (for example, a U terminal) of an intelligent power module.
(V terminal, W terminal) or a U-terminal, V terminal, W terminal of the terminal block, and a current detector with a built-in amplifier having current detection holes on the same line and on the same straight line.

[0009]

In the wiring using the electric wire, the current detection hole of the amplifier built-in current detector is output from the output terminal (for example, U terminal, V terminal, W terminal) of the intelligent power module (when detecting the output current of three phases) When wiring the output side after passing through, the position of the current detection hole of the intelligent power module and the current detector with built-in amplifier need not always be on the same interval and on the same straight line because the wire can be freely bent. Absent.

However, when considering the rationalization of the wiring by the copper bar wiring, it is desirable to use the linear copper bar as much as possible. When the current detector with a built-in amplifier according to the present invention is used, the current detection hole is arranged in accordance with the output terminal (for example, U terminal, V terminal, W terminal) of the intelligent power module, so that a copper bar having a complicated shape is formed. It is possible to perform wiring without using, and it is inexpensive and excellent in workability, and further, the power converter can be downsized.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A current detector with a built-in amplifier according to the present invention will be described in detail below with reference to embodiments shown in the drawings.

1 and 2 show an amplifier built-in current detector 10 according to an embodiment of the present invention. FIG. 1 is a front view and FIG. 2 is a bottom view. 3 is a top view of the intelligent power module, and FIG. 4 is a front view thereof.

In these figures, 1 is a current detection hole through which the copper bar 13 passes, 2 is a terminal for control signals, 3 is a positioning guide pin, and 4 is a mounting hole for the main body.

The distance between the detection holes of the current detector is determined by the output terminals of the intelligent power module (for example, U, V,
The width of each terminal W) is the same or almost the same. In this way, the wiring of the copper bar or the like is simple, and the shape of the copper bar does not require complicated processing, so the cost is low.

The height of the detection hole is also the output terminal of the intelligent power module (for example, each terminal of U, V, W).
The height h is the same as or almost the same. In this way, even if the current detector and the intelligent power module are installed on the same parallel surface, the copper bar for wiring can be a straight line and the shape is simple. of course,
The heights h do not have to be the same, and it is not necessary to explain that the heights may be adjusted on the current detector side, for example. FIGS. 5, 6, 7, and 8 described later show examples in which a current detector having a different h dimension is used in consideration of the height of the crimp fastener 19 on the main circuit board.

The signal of the amplifier-embedded current detector 10 is divided into two phases by utilizing the fact that the sum of the three-phase AC currents flowing through the AC motor is always 0 when detecting three-phase output currents. Of the current of the
One phase that is not detected is calculated and used for control.

FIG. 5 shows an embodiment in which the present invention is applied to downsizing of a power conversion device. In the figure, 10 is a current detector with a built-in amplifier, 11 is an intelligent power module, and 1 is an intelligent power module.
2 is a terminal block and 13 is a copper bar.

The intelligent power module 11 outputs three-phase AC power of a predetermined frequency and voltage by controlling the switching of the inverter unit by the control unit (inverter control unit), and controls the AC motor to a predetermined rotation speed. Work.

The terminal block 12 is a terminal block having a crimp terminal structure capable of directly fixing the copper bar 13. When copper bar wiring is performed in a power converter, there is no degree of freedom, unlike wires. That is, the wire can be bent freely, but the copper bar is formed by raising the mold in advance, so once the mold is created, the shape of the copper bar is determined and it cannot be bent freely like an electric wire. . It is necessary to have a copper bar that is a linear wiring with good workability at the shortest distance. As shown in the figure, if you use a current detector with a built-in amplifier in which the position of the current detection hole is aligned with the output terminal (for example, U terminal, V terminal, W terminal) of the intelligent power module, a straight copper bar can be used. Can be used for wiring.

FIG. 6 shows an embodiment in which the main circuit board is mounted and the screws are tightened.

FIG. 7 is another embodiment in which the present invention is applied to miniaturization of a power converter, and is an embodiment in which wiring is provided from an intelligent power module to a terminal block with a copper bar.

If the U terminal, V terminal, and W terminal of the terminal block are used as references, the current detection holes of the current detector with a built-in amplifier may be arranged accordingly.

FIG. 8 shows an embodiment in which the main circuit board is mounted and the screws are tightened.

Furthermore, if the output terminals (for example, U terminals, V terminals, and W terminals) of the intelligent power module and the terminals of the U terminal, V terminal, and W terminal of the terminal block are the same, the intelligent power module can be Wiring to the terminal block through the amplifier built-in current detector is 3
It is also possible to do this with a straight copper bar in a book.

FIG. 9 is a front view of another embodiment of a current detector which can be mounted on a board by soldering, for example. When the control signal terminal 2 is soldered to the board, there is a problem in strength to support the current detector only with the terminal. Therefore, the reinforcing pin 18 is also soldered to the board at the same time so that the pin has strength. It is a thing.

The detection holes of the current detector are arranged at the same intervals as the U, V and W output terminals of the intelligent power module. In this case, it is an example of three holes, but two holes may be used for two-phase detection. Also, even in the case of two-phase detection so that the copper bars of each output terminal are the same, it is effective to reduce the number of man-hours required for parts management and assembly work even if three holes are opened. is there.

[0027]

According to the present invention, the copper bar can have a simple shape that is as linear as possible, or even if the diameter of the wire is large (for example, 60SQ), the wire is bent. Since it is not necessary to pierce the wire, rationalizing the wiring will bring about great economical effects such as downsizing of the device and man-hours for wiring when assembling the device.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a current detector with a built-in amplifier according to the present invention.

FIG. 2 is a bottom view of FIG.

FIG. 3 is a top view of the intelligent power module.

FIG. 4 is a front view of the intelligent power module.

FIG. 5 is an explanatory view showing an example using the current detector with a built-in amplifier according to the present invention.

6 shows an embodiment in which a main circuit board 20 is mounted as compared with FIG.

FIG. 7 is an explanatory diagram showing an example using the current detector with a built-in amplifier according to the present invention.

8 shows an embodiment in which a main circuit board 20 is mounted as compared with FIG.

FIG. 9 is a front view showing another embodiment of the current detector with a built-in amplifier which can be mounted on the board of the present invention by soldering.

[Explanation of symbols]

1 ... current detection hole, 2 ... control terminal, 3 ... guide pin,
4 ... Mounting hole, 10 ... Amplifier built-in current detector, 1
DESCRIPTION OF SYMBOLS 1 ... Intelligent power module, 12 ... Terminal block, 13 ... Copper bar, 14 ... Copper bar, 15 ... Copper bar, 16 ... Copper bar, 17 ... Copper bar, 18 ... Reinforcing pin, 19 ... Caulking fastener, 20 ... Main circuit substrate,
21 ... Main circuit board, a ... U, V, W output terminal mounting pitch of intelligent power module, h ...
Height of current detection hole of current detector with built-in amplifier.

Front page continued (72) Inventor Mutsuo Tokashiki 7-1-1 Higashi Narashino, Narashino City, Chiba Prefecture Hitachi Narashino Factory (72) Inventor Masayuki Hirota 7-1 Higashi Narashino, Narashino City, Chiba Hitachi Keiyo Engineering Co., Ltd. Within the corporation

Claims (6)

[Claims] 1. U phase, W phase, two phases, U phase, V phase,
In a power converter that includes an amplifier built-in current detector having output current detection holes for detecting output currents of three phases of W phase, and is capable of outputting AC power of arbitrary voltage and frequency, An electric power converter comprising an amplifier built-in current detector located at the same interval as the output terminal of the intelligent power module. 2. The power converter according to claim 1, wherein the current detector with a built-in amplifier has current detection holes at the same intervals as the output terminals of the terminal block of the power converter. 3. The power converter according to claim 1, wherein the amplifier-embedded current detector has two current detection holes and one hole penetrating the wiring. 4. The power conversion device according to claim 1, wherein the current detector with a built-in amplifier has three current detection holes. 5. The power conversion device according to claim 1, wherein the external appearance and structure are such that the current detection holes can be arranged so as to be horizontal to the output terminals of the intelligent power module. 6. The power conversion device according to claim 1, wherein the current detection hole can be arranged so as to be horizontal to the output terminal of the terminal block.