JPH06339283A - Semiconductor power converter - Google Patents

Abstract

PURPOSE:To obtain a semiconductor power converter from which an arbitrary semiconductor unit can be taken out without increasing the external size of the unit nor stopping the load of its adjacent semiconductor unit. CONSTITUTION:A third common power supply bus 4c is provided beside common power supply buses 4A and 4B and the bus 4C is connected to the bus 4A. A contactor 7C to be put in the bus 4C is protruded from the rear end of an inverter unit 1. The bus 4a is provided on the rear side than the other buses 4B and 4C. Contactors 7A and 7B are directly connected to the output side of an inverter section and the contactor 7C is connected to the inverter section through a current-limiting resistor 10. On the right side face of the inverter unit 1, a taking-in/out lever 9 to which the unit 1 is locked at the disconnecting and initial charging positions and a disconnecting position releasing lever 13 are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a semiconductor power converter, and more particularly to a semiconductor power converter in which a plurality of units are connected to a common power source.

[0002]

2. Description of the Related Art In an inverter in which a plurality of inverter units are connected to a common DC power source, in order to operate a load, disconnect any inverter unit from the common power source and then reconnect it. An initial charging circuit for the filter capacitor is provided in each inverter unit.

FIG. 9 is a cross sectional view showing a state in which an initial charging circuit is incorporated in an inverter unit 1 of a conventional inverter. In FIG. 9, a pair of contacts 7 are provided at the rear end of the inverter unit 1 housed in the box body 3 so as to be freely drawn out.
A and 7B are projected rearward, and these contactors 7A and 7B
Are connected to DC common power supply buses 4A and 4B that are arranged vertically in parallel inside the box 3.

On the other hand, inside the inverter unit 1,
An inverter unit 12 including a plurality of switching elements, which are not shown in detail, is housed, and the contacts 7 and 7B are connected to an input terminal (not shown) of the inverter unit 12. Among them, the contactor 7A is connected to the positive input terminal of the inverter unit 12 via the contactor 20 and the current limiting resistor 10 connected in parallel to the contactor 20, and the contactor 7B is connected to the inverter unit 12. Is directly connected to the negative input terminal of, and a filter capacitor 11 is connected in parallel between these input terminals. The output line on the AC side is connected to a connector (not shown) provided on the right side of the inverter unit 1.

In the inverter unit 1 thus constructed, when the inverter unit 1 is connected to the common power supply buses 4A and 4B, the contactor 20 is previously prepared.
A method is employed in which the contactor 20 is connected after the connection is made in an open state, the inverter unit 12 is energized through the current limiting resistor 10 to charge the filter capacitor 11.

[0006]

However, in the inverter unit 1 thus constructed, the contactor 20
Because of this, the outer shape and weight of the inverter unit 1 increase, so the outer shape of the box body 3 also increases and the installation area increases. for that reason,
If the contactor 20 is omitted, when the inverter unit 1 is connected to the common power supply buses 4A and 4B via the contacts 7A and 7B, the filter capacitor 11 is damaged by the current flowing into the filter capacitor 11. .

Therefore, when connecting the inverter unit 1, it is conceivable to temporarily stop the power supply device (not shown) connected to the common power supply buses 4A and 4B and gradually raise the voltage. The load on the inverter units housed above and below must also be suspended. Also, a method of gradually increasing the voltage inside each inverter unit 1 may be considered, but this not only increases the outer shape of each inverter unit but also complicates the configuration.

Therefore, an object of the present invention is to obtain a semiconductor power conversion device capable of connecting / disconnecting an arbitrary semiconductor unit to a common power source without increasing the outer shape and without stopping the load of the adjacent semiconductor units. Is.

[0009]

According to a first aspect of the present invention, a box body in which first and second busbars are arranged is connected to and separated from the busbars via first and second contacts. A semiconductor power conversion device in which a plurality of semiconductor units are housed in a freely drawable manner, a current limiting element is connected between the first common bus bar and one side of the semiconductor unit, and a capacitor is connected between one side and the other side of the semiconductor unit, A third contact, which is connected to one side of the semiconductor unit and whose gap with the first busbar is larger than the gap between the first and second busbars and the first and second busbars, is placed opposite to the first busbar. It is characterized by having done.

Further, in the invention described in claim 2, a plurality of semiconductor units which are brought into contact with and separated from the busbar through the first and second contacts in a box body in which the first and second busbars are arranged in parallel. In a semiconductor power conversion device in which a current limiting element is connected between the first common bus bar and one side of the semiconductor unit and a capacitor is connected between one side and the other side of the semiconductor unit. A second bus bar is provided with a third bus bar in parallel, and the gap between the first bus bar and one side of the semiconductor unit is larger than the gap between the first and second contactors and the first and second bus bars. It is characterized in that the third contactor is arranged opposite to the third bus bar.

Further, the invention according to claim 3 is the first,
A plurality of semiconductor units that come into contact with and separate from the busbar via the first and second contacts are housed in a box in which the second busbars are juxtaposed so as to be freely drawn out, and one side of the first common busbar and the semiconductor unit is provided. In a semiconductor power conversion device in which a current limiting element is connected between them and a capacitor is connected between one side and the other side of the semiconductor unit, the gap between the first busbar and the first busbar is connected to one side of the semiconductor unit. A third contact, which is larger than the gap between the contact and the first and second busbars, is opposed to the first busbar, and the first and second contactors of the semiconductor unit are the first and second busbars. A locking mechanism is provided to prevent the semiconductor unit from moving at the charging position in contact with.

[0012]

In the invention described in claim 1, when the semiconductor unit is inserted into the box body, the first and second contact elements are moved to the first contact point before the third contact element contacts the first bus bar. , Contacting the second busbar, the capacitor is charged by the voltage applied from the first and second busbars through the current limiting element.

Further, in the invention described in claim 2,
When the semiconductor unit is inserted into the box, the first and second contactors are connected to the first and second contactors before they contact the third busbar.
Contacting the second busbar, the capacitor is charged by the voltage applied from the first and second busbars through the current limiting element.

Further, in the invention as set forth in claim 3, when the semiconductor unit is inserted into the box, the first and second contacts are contacted before the third contact contacts the first busbar. The capacitor is contacted with the first and second buses, the capacitor is charged by the voltage applied from the first and second buses through the current limiting element, and the first, second and third contacts are After the locking mechanism is unlocked, it is fully connected to the first and second busbars.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the semiconductor power converter of the present invention will be described below with reference to the drawings. 1 is a perspective view showing a semiconductor power conversion device of the present invention, FIG. 2 is a partially enlarged detailed perspective view of FIG. 1, and FIG. 3 is an exploded perspective view of FIG.

In FIG. 1, inside a box body 3 which constitutes a semiconductor power conversion device, slide rails 2 which are not shown in detail on the inside of the left and right are provided vertically in 6 rows at equal intervals.
An inverter unit 1 which will be described later with reference to FIGS. 2 and 3 is placed on these slide rails 2 and can be pulled out forward and backward.

At the rear of the inverter unit 1, the contactor 7C, which is the same as the contactor 7A, 7B, is protruded on the right side of the contactor 7A, 7B that is protruded as in the conventional case. . Of these, the contacts 7A and 7B are directly connected to an input terminal of an inverter unit (not shown) of the inverter unit 1, and the contact 7C is a current limiting unit (not shown), as shown in FIGS. 5, 6 and 7 described later. It is connected to the positive input terminal via a resistor.

Further, common power supply buses 4A and 4B are vertically provided at the rear portion of the box body 3 as in the conventional case. Of these, the common power supply bus bar 4A is described later showing a partial cross section of the box body 3. As shown in FIG. 5, FIG. 6 and FIG.
In addition to being located slightly rearward of B, the third common power supply is also located on the right side of the common power supply bus 4A at the same position in the front-rear direction as the common power supply bus 4B, as shown in FIGS. 5, 6 and 7. A bus bar 4C is provided, and this common power bus bar 4C is connected to the common power bus 4A.

2 and 3, strip-shaped support plates 5A and 5B are provided on the left and right sides of the upper surface of the inverter unit 1 so as to project therefrom. Similarly, strip-shaped front edge plates 6A and 6B are also projectingly provided on the left and right ends of the front surface of the inverter unit 1. Of these, a rectangular guide hole 8 is provided in the front edge plate 6B.
A and 8B are formed vertically.

A rectangular thick support seat 17 is welded to the rear portion of the right side surface of the inverter unit 1.
A female screw hole 17a is formed in the central portion of the. Support seat
Below the 17 pins on the right side of the inverter unit 1
Is projected.

The rear end of the take-out lever 9 provided on the right side of the inverter unit 1 abuts on the outer surface of the support seat 17 via the annular spacing piece 15, and the take-out lever 9 is attached.
L-shaped handle 9a welded to the front end of the front edge plate 6B
As shown in FIG. 2, the guide hole 8A formed in the upper part of the is penetrated and projected forward.

A pin hole 9b is provided at the rear end of the take-in / out lever 9.
The rear end of the disconnection position release lever 13 abuts on the outer surface of the pin hole 9b via the spacing piece 15, and the handle 13a welded to the front end of the disconnection position release lever 13 has a front edge plate. It penetrates through a guide hole 8B formed in the lower portion of 6B and projects forward.

A pin hole is provided at the rear end of the disconnection position release lever 13.
13b is formed, and the disconnector position release lever 13 and the take-out lever 9 are pin holes 9b, 13b formed at their rear ends.
The shaft portion is inserted into the space pieces 15 on both sides of these, and the external thread portion of the tip is supported by the headed stepped pin 16 screwed into the female screw hole 17a.

A small-diameter through hole 9c is provided in the middle of the take-out lever 9, and a small-diameter through hole 13c is also provided in the middle of the disconnection position release lever 13. The front end of the return spring 24 is locked in the through holes 9c and 13c, and the rear end of the return spring 24 is locked in the pin 14. Handle 9a of take-in / out lever 9 and handle 13a of disconnection position release lever 13
Is pressed against the lower ends of the guide holes 8A and 8B by the return force of the return spring 24.

A groove 9 is formed at the front end of the lower surface of the take-in / take-out lever 9.
d and 9e are formed in order, and a groove 13d is also formed at the front end of the lower surface of the disconnection position release lever 13 so as to be positioned slightly behind the groove 9d when viewed from the right side surface. Box 3 shown in FIG.
On the inner surface of the right side of the contactor 7A, 7B, 7 protruding from the rear of the inverter unit 1 inserted in the box body 3.
In the disconnection position where all of C are placed in front of the above-mentioned common power source buses 4A, 4B, 4C standing upright behind these contacts 7A, 7B, 7C with a predetermined gap,
An L-shaped lock plate 18, which is loosely fitted as will be described later, is fixed to the groove 13d of the disconnection position release lever 13.

Next, the operation of the semiconductor power conversion device having the inverter unit 1 thus constructed will be described. Figure 4
In the explanatory view, (a) in the uppermost row shows a state in which the inverter unit 1 is pulled out to a maintenance / inspection position in front of the box 3 for maintenance / inspection and positioned by a stopper (not shown). The take-in / out lever 9 and the disconnecting position release lever 13 actually overlap with each other when viewed from the right side as described above with reference to FIGS. 2 and 3, but are shown separated from each other for the sake of explanation.

When the inverter unit 1 in the maintenance position is further inserted, first, the lower portion of the rear slope of the groove 13d of the disconnection position release lever 13 comes into contact with the upper surface of the lock plate 18 and slides. Further, by inserting the inverter unit 1, the contacts 7B, 7C protruding rearward of the inverter unit 1
When the gap between the common power supply buses 4B and 4C at the rear reaches a disconnection position of a predetermined distance determined by the voltage of the common power supply bus, as shown in the disconnection position (b) of FIG.
The upper portion of the lock plate 18 is loosely fitted into the groove 13d of the above, and the inverter unit 1 stops.

When the inverter unit 1 at the disconnection position is further inserted, the handle 13a of the disconnection position release lever 13 is provided.
Is lifted up, the upper surface of the handle 13a is brought into contact with the upper end surface of the guide hole 8B to disengage the groove 13d from the lock plate 18, and the inverter unit 1 is inserted. Then, the lock plate 18 is loosely fitted into the groove 9d formed at the lower end of the take-out lever 9 as shown in the initial charging position (c) of FIG. 3, and the inverter unit 1 is stopped. Further, as shown in FIG. 6, the tips of the contacts 7B, 7C are slightly fitted to the front ends of the common power supply buses 4B, 4C behind the contacts 7B, 7C, and a voltage is applied to the filter capacitor 11. , The filter capacitor 11 is charged.

When the inverter unit 1 is further inserted and moved to the operation position shown in FIG.
At the initial charging position (C), the handle 9a of the lever 9 is lifted, and the upper surface of the handle 9a is brought into contact with the upper end surface of the guide hole 8A to engage the groove 9d of the lever 9 with the lock plate 18. Remove and insert the inverter unit 1. Then, the contacts 7A, 7B, 7C are completely inserted into the common power supply buses 4A, 4B, 4C respectively with predetermined contact pressures as shown in FIG. 7, and as shown in the operating position (d) of FIG.
The upper portion of the lock plate 18 is loosely fitted in the groove 9e of the take-out lever 9, and the inverter unit 1 is locked. As a result, the switching element (not shown) incorporated in the inverter unit 12 of the inverter unit 1 is ignited, and the contact 7
Predetermined DC power is supplied from common power supply buses 7A and 7B via A and 7B, and AC power is supplied to a load (not shown).

When the inverter unit 1 in the operating position is pulled out to the maintenance / inspection position through the disconnection position, the above operation is reversed, but the inverter unit 1 is pulled out by an L-shape welded to the front end of the access lever 9. Hold the handle 9a.

Therefore, in the semiconductor power conversion device in which the inverter unit 1 is constructed as described above, when the inverter unit 1 is inserted, the inverter unit 1 is once stopped at the disconnection position, and at the charging position, the access lever 9 and the lock plate 18 are connected. After further stopping by the engagement, the filter capacitor 11 is inserted into the operating position and connected to the power source, so that the filter capacitor 11 can be prevented from being damaged. Therefore, any inverter unit housed in the box 3 can be pulled out.

Further, the take-out lever 9 for locking and locking the respective insertion positions, the disconnecting position releasing lever 13, the return spring 24 and the lock plate 18 are used to slide the inverter unit 1 into the slide rail 2
Since it can be stored under the support plate 5B because it is mounted on the inverter unit 1, it is not necessary to increase the outer shape of the inverter unit 1, and the contactor is not mounted unlike the conventional inverter unit. Small
It can also be made lighter.

FIG. 8 is a diagram showing another embodiment of the semiconductor power conversion device of the present invention and corresponds to FIG. In FIG. 8, a guide plate 24 is projectingly provided inside the right side surface of the box body 3, and a female screw is formed on the guide plate 24 in the front-rear direction.

On the other hand, a support 21 is provided at the front end of the right side surface of the inverter unit 1, and the support 21 has a nut 21a.
Are pierced and fixed. A hexagon socket head cap screw 19 having a nominal diameter of 16 is screwed into the nut 21a from the front.

In the semiconductor power conversion device in which the inverter unit 1 thus constructed is incorporated, the semiconductor power conversion device shown in FIG.
When inserting the inverter unit 1 at the maintenance / inspection position (a), the tip of the hexagon socket head cap screw 19 is formed on the guide plate 24 before the disconnecting position (b) and fits into the screw hole. One side of the handle for taking in and out is fitted to the head of the hexagon socket head cap screw 19, the handle 13a of the disconnection position release lever 13 is lifted with the left hand, and the handle is rotated to the right. Then, the tip of the hexagon socket head cap screw 19 is the guide plate.
Since it is formed into 24, it is screwed into the screw hole and the hexagon socket head cap screw
The inverter unit moves rearward with 19 and stops at the initial charging position shown in FIG.

When inserting from the initial charging position to the operating position, the handle of the loading / unloading lever 9 is lifted and the handle for loading / unloading is rotated to the right, so that the hexagon socket head cap screw 19 is screwed into the guide plate 24. The inverter unit 1 is inserted, and the contacts 7A, 7B, 7C are completely connected to the common power supply buses 4A, 4B, 4C with a predetermined contact pressure.

In this case, when the contacts 7A, 7B, 7C are inserted into the operating position from the initial charging position, the insertion resistance is suddenly increased when the contacts 7A, 7B, 7C are fitted to the common power source buses 4A, 4B, 4C. , Can be easily fitted.

In the above embodiment, only the common power source bus 4A of the common power source buses 4A, 4B and 4C is positioned rearward to delay the contact time with the contact 7A. The power source bus 4A may be located at the same position as the other common power source buses 4B and 4C, and instead the contact portion of the contactor 7A may be positioned forward.

Further, in FIGS. 5, 6 and 7, FIG.
Depending on the configuration conditions of the box body 3 and the inverter unit 1 shown by, the common power supply bus bar 4C is omitted, the common power supply bus bar 4A is located at the same position as the common power supply bus bar 4B, and the contact 7
A is shortened (or contacts 7B and 7C are extended), and contact 7
By providing C above or below the contactor 7A (that is, in the direction orthogonal to the paper surface in FIGS. 5 to 7), the connection timing of the contactor 7A and the other contactors 7B and 7C may be changed. In this case, two common power supply buses can be used as in the conventional case.

Further, in the above-mentioned embodiment, the common power supply buses 4A, 4B and 4C having the same length are arranged between the upper part and the lower part of the box body 3, however, for example, the common power supply bus 4A is contacted. Only the portion where the child 7A is fitted may be connected and fixed to the common power source bus 7C with a U-shaped connecting conductor, or vice versa. Further, the common power source buses 4A and 4B may be formed as an integral product that is bent in a U shape.

Further, in the above-mentioned embodiment, the case where the unit housed in the box body 3 so as to be freely drawn out is the inverter unit has been explained, but regardless of the forward conversion or the reverse conversion,
The present invention can be applied to any semiconductor power conversion device in which a unit connected / disconnected to a common power bus in the box is housed so as to be freely drawn out.

[0042]

As described above, according to the invention of claim 1,
A plurality of semiconductor units that come into contact with and separate from the busbar via the first and second contacts are housed in a box body in which the first and second busbars are juxtaposed so as to be freely drawn out, and the first common busbar and the semiconductor In a semiconductor power conversion device in which a current limiting element is connected between one sides of a unit and a capacitor is connected between one side of a semiconductor unit and the other side, a gap between the first busbar and a first busbar is connected to one side of the semiconductor unit. When the semiconductor unit is inserted into the box by placing the third contact larger than the gap between the second contact and the first and second busbars and the first busbar,
The first and second contactors contact the first and second busbars before the contactor contacts the first busbar,
Since the charging is performed by the voltage applied from the second busbar through the current limiting element, it is possible to connect / disconnect any semiconductor unit without increasing the outer shape and without stopping the load of the adjacent semiconductor unit. A semiconductor power conversion device capable of being obtained can be obtained.

According to the second aspect of the invention, in the box body in which the first and second busbars are arranged side by side, the plurality of busbars that come in contact with and separate from the busbars via the first and second contacts are provided. A semiconductor power conversion device in which a semiconductor unit is retractably housed, a current limiting element is connected between a first common bus bar and one side of the semiconductor unit, and a capacitor is connected between one side and the other side of the semiconductor unit. , A third bus bar is arranged in parallel with the second bus bar, and the gap between the first bus bar connected to one side of the semiconductor unit is smaller than the gap between the first and second contactors and the first and second bus bars. When the semiconductor unit is inserted into the box body by placing the third contactor, which has a large size, in opposition to the third busbar, the first, second, and third contactors come in contact with the third busbar. Contacts the first and second busbars, and the capacitor is printed from the first and second busbars via the current limiting element. Since it is charged by the applied voltage, it is possible to obtain a semiconductor power conversion device capable of connecting / disconnecting any semiconductor unit without increasing the outer shape and without stopping the load of the adjacent semiconductor unit. .

Further, according to the invention described in claim 3,
A plurality of semiconductor units that come into contact with and separate from the busbar via the first and second contacts are housed in a box body in which the first and second busbars are juxtaposed so as to be freely drawn out, and the first common busbar and the semiconductor In a semiconductor power conversion device in which a current limiting element is connected between one sides of a unit and a capacitor is connected between one side of a semiconductor unit and the other side, a gap between the first busbar and a first busbar is connected to one side of the semiconductor unit. A third contact, which is larger than the gap between the second contact and the first and second busbars, is placed opposite to the first busbar,
At the charging position where the first and second contacts of the semiconductor unit are in contact with the first and second busbars, a locking mechanism that prevents movement of the semiconductor unit is provided, so that the semiconductor unit is inserted into the box body. And the first and second contactors contact the first and second busbars before the third contactor contacts the first busbar, and the capacitor limits the current from the first and second busbars. While being charged by the voltage applied through the element,
Since the second and third contacts are completely connected to the first and second busbars after the locking mechanism is unlocked, the load of the adjacent semiconductor units can be increased without increasing the outer shape. It is possible to obtain a semiconductor power conversion device capable of connecting / disconnecting any semiconductor unit without stopping.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a semiconductor power conversion device of the present invention.

FIG. 2 is a partially enlarged detailed view showing an embodiment of the semiconductor power conversion device of the present invention.

FIG. 3 is a partially exploded perspective view showing an embodiment of a semiconductor power conversion device of the present invention.

FIG. 4 is a right side view showing the operation of the semiconductor power conversion device of the present invention.

FIG. 5 is a partial cross-sectional view showing the operation of the semiconductor power conversion device of the present invention different from that in FIG.

FIG. 6 is a partial transverse cross-sectional view showing an operation of the semiconductor power conversion device of the present invention which is different from those in FIGS. 4 and 5.

FIG. 7 is a partial transverse cross-sectional view showing an operation different from those of FIGS. 4, 5, and 6 of the semiconductor power conversion device of the present invention.

FIG. 8 is a right side view showing another embodiment of the semiconductor power conversion device of the present invention.

FIG. 9 is a cross-sectional view showing a conventional semiconductor power conversion device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Inverter unit, 2 ... Slide rail, 3 ... Box body, 4A, 4B, 4C ... Common power source bus bar, 5A, 5B ... Support plate, 6A, 6B ... Front edge plate, 7A, 7B, 7C ... Contact, 8A , 8B ... Guide hole, 9 ... In / out lever, 10 ... Current limiting resistor, 11 ... Filter capacitor, 12 ... Inverter section, 13 ... Disconnection position release lever, 14 ... Pin, 15 ... Spacing piece,
16 ... Stepped pin with head, 17 ... Support seat, 18 ... Lock plate.

Claims (3)

[Claims] 1. A plurality of semiconductor units contacting and separating from the busbar via first and second contacts are housed in a box in which first and second busbars are juxtaposed so as to be freely drawn out. In a semiconductor power conversion device in which a current limiting element is connected between a first common bus bar and one side of the semiconductor unit, and a capacitor is connected between one side and the other side of the semiconductor unit, the semiconductor power conversion device is connected to one side of the semiconductor unit. A third contact having a gap with a first bus bar larger than a gap between the first and second bus bars and the first and second bus bars is arranged opposite to the first bus bar. And a semiconductor power conversion device. 2. A plurality of semiconductor units contacting and separating from the busbar via first and second contacts are housed in a box in which first and second busbars are juxtaposed so as to be freely drawn out. In a semiconductor power conversion device in which a current limiting element is connected between a first common busbar and one side of the semiconductor unit, and a capacitor is connected between one side and the other side of the semiconductor unit, the first and second busbars are connected. A third busbar is arranged in parallel and is connected to one side of the semiconductor unit, and a gap between the first busbar and the first busbar is larger than a gap between the first and second contactors and the first and second busbars. The third power contact device is arranged opposite to the third bus bar. 3. A plurality of semiconductor units contacting and separating from the busbars via first and second contacts are housed in a box in which first and second busbars are arranged side by side so as to be able to be drawn out. In a semiconductor power conversion device in which a current limiting element is connected between a first common bus bar and one side of the semiconductor unit, and a capacitor is connected between one side and the other side of the semiconductor unit, the semiconductor power conversion device is connected to one side of the semiconductor unit. A third contact having a gap with the first bus bar larger than a gap between the first and second contacts and the first and second bus bars is placed opposite to the first bus bar, and the semiconductor is provided. A semiconductor power conversion device comprising a locking mechanism for preventing movement of the semiconductor unit at a charging position where the first and second contacts of the unit are in contact with the first and second buses. .