KR20100059715A - Semiconductor unit and power conversion equipment - Google Patents

Abstract

PURPOSE: A semiconductor unit and a power conversion device thereof are provided to automate the operation from an initial charge state to a conductive state by installing a switch for initially charging, which is opened and closed with the voltage of a smoothing condenser within an inverter unit. CONSTITUTION: A contactor and a second contactor are connected to a common power supply line(101a,101b) of an enclosing part(100). A smoothing condenser(203) smoothes the power source. An inverter unit(202) changes the power source smoothed in the smoothing condenser. An opening and closing part is connected to a current limiting element in parallel. A voltage detecting part detects the charging voltage of the smoothing condenser. A controller operates the opening and closing part with the voltage detected from the voltage detecting part.

Description

Semiconductor Units and Power Converters {SEMICONDUCTOR UNIT AND POWER CONVERSION EQUIPMENT}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a semiconductor unit accommodated in a storage panel, and a power conversion device including the semiconductor unit and the storage panel. In particular, when the semiconductor unit is lively inserted and inserted from the storage panel while power is supplied from the storage panel. It relates to a preferred semiconductor unit and power converter.

Generally, a semiconductor power conversion device composed of a semiconductor unit housed in a storage panel and the storage panel, in which an inverter unit in the housed unit performs power conversion for converting DC power into AC power and supplies the necessary equipment. . The power used for conversion is supplied by connecting a common power supply bus bar and a contactor. Moreover, in such an apparatus, smoothing of the electric power from an AC power supply is needed for electric power conversion, and the smoothing capacitor is provided.

On the other hand, the smoothing capacitor requires an initial charging circuit. In the initial charging, a circuit for a current limiting element is provided in order to prevent an initial excessive voltage. For example, in the technique described in JP-A-6-74092, a circuit for a current limiting element is used. For this purpose, a contactor and a common power bus for the current limiting element are provided separately from the normal operation.

As described above, in the prior art, in initial charging, since it is necessary to provide a contactor and a common power bus, which are circuits for the current limiting element, the weight increases and the installation area increases. In addition, an increase in cost due to an increase in mechanical mechanism is expected.

In addition, when the maintenance takes time and the current limiting element does not function effectively, there is a possibility that the smoothing capacitor is destroyed.

In view of these points, it is an object of the present invention to provide a semiconductor unit and a power conversion device, which are preferable for simplifying a circuit and for automating a series of tasks.

In order to achieve the above object, in addition to the common power bus bar provided in the semiconductor unit and the contact detachable, the smoothing capacitor for smoothing the power obtained from the contactor, and the inverter section for converting the smoothed power from the smoothing capacitor, the current limitation is also limited. An initial charging switch operation circuit for operating an opening and closing unit such as an initial charging switch connected in parallel to the element, a voltage detecting unit detecting a charging voltage of the capacitor, and an opening and closing unit of the initial charging switch by the voltage detected by the voltage detecting circuit. It has a control unit such as.

By doing in this way, specifically, the switch for initial charges operates the switch for initial charges with the voltage which detected the voltage of the both ends of the smoothing capacitor which changes with the insertion of a semiconductor unit by the voltage detection circuit on the basis of arbitrary threshold values. Opening and closing control is performed through the circuit. Therefore, the initial charging switch is a closed circuit for detecting a voltage higher than an arbitrary threshold value and an open circuit for detecting a low voltage. However, the threshold at this time is a value at which the smoothing capacitor is not destroyed from the inrush current generated by the insertion of the semiconductor unit.

According to the present invention, mounting can be performed simply and reliably in a live state, and a series of operations can be automated. More specifically, an initial charging switch which is opened and closed by the voltage at both ends of the smoothing capacitor is provided, and the initial charging switch is configured to control the connection of the current limiting element. Operation is not necessary and can be mounted simply and reliably. In addition, it is possible to automate a series of operations from the initial state of charge to the state of energization rather than the operation dependent on the hand of a person.

Moreover, also about the shape of an apparatus, the bus bar and the contactor used at the time of a connection initial stage are not needed, and the apparatus can be comprised with a small and low cost by that much. Therefore, it is possible to reduce the cost, simplify the maintenance, and shorten the maintenance time.

EMBODIMENT OF THE INVENTION Hereinafter, the example of one Embodiment of this invention is demonstrated using drawing. In order to make it easy to understand, the reference example of FIGS. 1-3 is given first, and following this, the basic idea is clearly demonstrated and demonstrated.

As a reference example, as a reference example, the semiconductor unit accommodated in the storage board and the semiconductor board comprised with the storage board have the thing of the structure shown in FIG. As shown in FIG. 4, a plurality of inverter units are accommodated in a storage board, and the inverter unit in each of the accommodated inverter units performs power conversion for converting DC power into AC power to supply the necessary equipment. will be. In the case of this example of FIG. 4, the insertion and removal from the storage panel of the inverter unit is performed with the power supplied. In order to insert and remove with this power supply supplied, the initial charging circuit of the smoothing capacitor is required in the inverter unit.

Referring to the configuration of FIG. 4, reference numeral 10 denotes a storage panel, and the storage panel 10 is accommodated so that a plurality of inverter units 20 can be pulled out or pressed in through the slide rail. In the example of FIG. 4, six inverter units 20 are arranged vertically. Inside the storage panel 10, the common power buss 11a and 11b for the main circuit and the common power buss 11c for initial charging are provided. DC power is supplied to common power buses 11a and 11b for the main circuit through a power system not shown.

Here, the common power source buses 11a and 11b and the common power source bus 11c for initial charging are arranged as shown in FIG. 5 when viewed from the plane from above. That is, the common power supply bus 11b is retracted by the distance L with respect to the common power supply bus 11a, and the common power supply bus 11c for initial charge only is made to be the same position as the common power supply bus 11a. The common power supply bus 11c and the common power supply bus 11b dedicated to initial charging are connected to be the same pole.

The structure of the inverter unit 20 of FIG. 4 is the structure shown in FIG. That is, the inverter unit 20 is provided with the contactors 21a, 21b, 21c which can contact-connect with the common power bus 11a, 11b, 11c. The power source obtained by the contacts 21a and 21b is smoothed by the smoothing capacitor 23. The power smoothed by the smoothing capacitor 23 is supplied to the inverter part 22 provided with a semiconductor circuit, and is converted into predetermined | prescribed AC power supply. Moreover, the current limiting element 24 which suppresses inrush current to the smoothing capacitor 23 of the power supply obtained by the contactor 21c is provided. Although not shown, the load side of the inverter unit 22 is connected to a terminal unit provided in the housing panel 10 via a contact-shaped connecting unit, and automatically connected or disconnected when the inverter unit is press-fitted or drawn out. .

The operation | movement at the time of accommodating the inverter unit 20 comprised in this way in the accommodating board | substrate 10 is demonstrated with reference to FIG.

First, as shown to Fig.6 (a), it has the handle 25 which protruded to the outside of the front side of the inverter unit 20, and press-fits along the slide rail in the storage board 10. As shown to FIG. When press-fitted in this way, as shown in FIG. 6B, the inverter unit 20 reaches the initial charging position, and the contact 21a is connected to the common power bus 11a and the common power bus 11c dedicated for initial charging. ), The contactors 21c are connected to each other, and charging is performed to the smoothing capacitor 23 of the inverter unit 20 via the current limiting element 24. When the inverter unit 20 is press-fitted, as shown in FIG. 6C, the common power supply bus 11b and the contactor 21b are connected to complete press-fitting. In this state where the press-in has been completed, power is directly supplied from the common power bus 11b to the inverter unit 22 via the contactor 21b. The process of converting this supplied DC power supply into AC power in the inverter part 22 is performed, and AC power converted into the load which is not shown in figure is supplied.

In the semiconductor power converter, at the time of mounting to the storage panel 10, as shown in FIG. 6B, the common power supply buses 11a and 11c and the contacts 21a and 21c first contact each other. The common power supply bus 11b and the contactor 21b are in contact with each other. For this reason, as a charging current to the smoothing capacitor 23, it is initially supplied in the state limited by the current limiting element 24. As shown in FIG. Thereafter, in a completely mounted state, power is supplied without passing through the current limiting element 24, and the limiting by the current limiting element 24 does not function when the inverter unit 22 is in operation.

According to the electric power converter provided with the inverter unit 20 of the structure shown to FIG. 4 thru | or 6, when mounting to the storage board 10, the electric current which flows into the smoothing capacitor 23 will be restrict | limited, Even if this is performed, the smoothing capacitor 23 will not be destroyed.

In the inverter unit 20 comprised in this way, since it is necessary to provide the contactor 21c and the common power supply bus | line 11c which are external circuits for initial charge, the inverter unit 20 and the inverter unit 20 are accommodated. The appearance and weight of the storage panel 10 increases, and the installation area of the storage panel increases. In addition, the cost is inevitably increased due to the increase in mechanical mechanism for positioning.

In addition, in order to move the inverter unit 20 to the disconnection position, the initial charging position, and the operation position, it is necessary to insert the inverter unit 20 by human force, which takes time to repair. In addition, if the inverter unit 20 is inserted in the state shown in FIG. 6C without being stopped once in the state shown in FIG. 6B when the inverter unit 20 is inserted, the current limiting element There is a possibility that the 24 does not function effectively and the smoothing capacitor 23 is destroyed.

In view of these points, the following description will be continued from the point of simplifying an external circuit for initial charging and allowing a series of tasks to be in an operating state in which human power is interposed.

The overall structure of the semiconductor power converter of the example of this embodiment is shown in FIG. In FIG. 1, in the storage panel 100 which comprises a semiconductor power converter, the inverter unit 200 is arrange | positioned at six steps at equal intervals, and can draw out back and forth. In addition, two common power supply buses 101a and 101b are disposed in parallel between the inverter unit back side and the storage panel in a vertical direction. DC power is supplied to two common power supply buses 101a and 101b.

A side plate is attached to the both sides of the upper board and the bottom board arrange | positioned in parallel, and the back panel is comprised by the back board, and the front side is open | released to the storage board | plate 100 at the outside. The interior space of the storage panel 100 divided into a top plate, a bottom plate, a side plate and a back plate constitutes a storage chamber.

Each inverter unit 200 arranged in six stages is the same structure, and is comprised in the case of the same shape.

Contactors 201a and 201b are provided on the rear surface of the inverter unit 200. The contacts 201a and 201b are electrical contacts for connecting with the common power bus lines 101a and 101b. Slide rails 104 are disposed at both ends in the width direction of the inverter unit 200. The contact unit 201a, 201b and the common power bus lines 101a, 101b are connected by storing the inverter unit 200 in the storage chamber of the storage board 100 along this slide rail 104. As shown in FIG.

In FIG. 2, the internal structure of the inverter unit 200 seen from the top is shown.

In the example of this embodiment, the inverter unit 200 smoothes the contactors 201a and 201b which are detachable from the common power bus lines 101a and 101b, and the power supply obtained by the contacts 201a and 201b. It is provided. In addition, an inverter unit 202 for converting the power smoothed by the smoothing capacitor 203 is provided.

In addition, a current limiting element 204 for suppressing inrush current to the smoothing capacitor 203 of the power supply obtained from the contacts 201a and 201b, and an initial charging switch 208 connected in parallel to the current limiting element 204. The parallel circuit is connected between the contactor 201b and one end of the smoothing capacitor 203.

The charging voltage of the smoothing capacitor 203 is configured to be detected by the voltage detection circuit 206. The voltage detected by the voltage detecting circuit 206 is determined by the initial charging switch operating circuit 207, and is configured to operate (control) the opening and closing of the initial charging switch 208 according to the determined voltage value. Doing.

As the opening / closing control of the initial charging switch 208, the voltage detected by the voltage detecting circuit 206 at both ends of the smoothing capacitor 203 which changes due to the insertion and removal of the inverter unit 200 is set to an arbitrary threshold value. At the boundary, the opening and closing control of the initial charging switch 208 is performed through the initial charging switch operation circuit 207. Therefore, the initial charging switch 208 sets the case where the closing control is detected when a voltage higher than an arbitrary threshold value is detected and the case where the low voltage is detected as an open control.

Usually, the DC terminal of the converter unit 102 having the same configuration as that of the inverter unit 200 is connected to the common power bus lines 101a and 101b so as to maintain a constant DC voltage (hundreds to thousands of V). It is. For this reason, in the disconnected state, it is necessary to maintain sufficient insulation distance between the contacts 201a and 201b and the common power bus lines 101a and 101b.

In the disconnected state, the inverter unit 200 stops at a position where a sufficient insulation distance is maintained between the contacts 201a and 201b and the common power bus lines 101a and 101b, and the inverter unit 200 is not energized. Shall be.

Next, with reference to FIG. 3, the operation | movement at the time of attaching the inverter unit 200 of the example of this embodiment to the storage panel 100 is demonstrated.

It has the handle 205 which protruded to the outside of the front side of the inverter unit 200, it moves along the slide rail 104, and accommodates the inverter unit 200 in the storage chamber of the storage board 100. As shown in FIG. By storing in this way, as shown to Fig.3 (a), the common power supply bus line 101a, 101b and the contactors 201a, 201b are connected. At this time, since the smoothing capacitor 203 is not charged, the voltage of both ends of the smoothing capacitor 203 is sufficiently low by the voltage detecting circuit 206 and the initial charging switch operation circuit 207 is detected. The initial charging switch 208 is set to the open path, and a current flows into the smoothing capacitor 203 through the current limiting element 204 connected to the contactor 201b, so that the smoothing capacitor 203 is charged. As the smoothing capacitor 203 is charged, the voltage across the smoothing capacitor 203 increases. This voltage is detected by the voltage detecting circuit 206, and the initial charging switch 208 is automatically closed by the initial charging switch operating circuit 207 at the place where the threshold value is greater than or equal to an arbitrary threshold. As shown in 3 (b), a current flows into the smoothing capacitor 203 through the initial charging switch 208.

When the inverter unit 200 is inserted, the smoothing capacitor 203 flows an inrush current having an amplitude proportional to the difference between the voltages related to the common power bus lines 101a and 101b and the voltages between both ends of the smoothing capacitor 203. Therefore, it is necessary to select a threshold value at which the smoothing capacitor 203 is not destroyed. By giving hysteresis to this threshold value, it is possible to prevent chattering of the initial charging switch 208.

Further, at the time of initial charging, the current limiting element 204 is a time constant derived by the resistance value of the current limiting element 204 and the capacity of the smoothing capacitor 203, and the pulse-shaped current flows only for a short time. In addition, since the number of times of energization becomes the same as the number of times of insertion and insertion of the inverter unit 200, energization becomes a cold start only at the time of maintenance.

Therefore, a resistor having a smaller resistance value can be used than a resistor used in a condition where current is constantly flowing at a normal hundreds to several thousand V, and the effect of shortening the charging time of the smoothing capacitor 203 can be obtained.

In the inverter unit 200, an initial charging switch 208 that is opened and closed by voltages at both ends of the smoothing capacitor 203 is provided, and the initial charging switch 208 connects the current limiting element 204 to the initial charging switch 208. By controlling the configuration, when the inverter unit 200 is inserted into the storage panel 100, two stages of insertion operations are not required as in the reference example, and it can be easily and reliably mounted in a live state. The effect of being able to automate a series of operations from an initial charge state to an energized state is acquired, instead of the operation depending on the hand.

Moreover, also about the shape of an apparatus, the bus bar and the contactor which are used at the time of a connection initial stage are not needed, and the apparatus can be comprised in a small and low cost by that much. For this reason, compared with the reference example, the effect that the cost reduction and the maintenance can be simplified is also obtained.

In addition, in the example of the above-mentioned embodiment, although the conductor which has a rectangular parallelepiped type | mold was used as the common power bus lines 101a and 101b, it may be a connector with a cable as long as it can ensure an electric current carrying capacity. In this case, the effect that the freedom of a connection position becomes high by using a connector is acquired.

In addition, in the above-mentioned embodiment, although the inverter unit provided with the inverter part was applied in the structure which wire-inserts as a semiconductor power conversion apparatus, if it is similarly applicable, if it is a semiconductor unit which wire-inserts and removes, it is applicable also in addition to an inverter. In addition, the external shape shown in FIG. 1 etc. showed an example, and this invention is not limited to what was shown.

1 is a perspective view showing a power conversion device according to an example of one embodiment of the present invention;

2 is a configuration diagram taken out to the disconnection position of the semiconductor inverter unit according to the embodiment of the present invention.

3 is a configuration diagram illustrating current paths in an initial charged state and an operating state of an inverter unit according to an embodiment of the present invention.

4 is a perspective view illustrating an example of a power converter of a reference example.

5 is a configuration diagram of an inverter unit of the power converter of the example of FIG. 4.

FIG. 6 is an explanatory diagram showing the operation of the power converter of the example of FIG. 4. FIG.

<Explanation of symbols for the main parts of the drawings>

10: storage board

11a, 11b, 11c: common power bus

12: converter section

13: smoothing condenser

14 handle

20: inverter unit

21a, 21b, 21c: contactor

22: inverter unit

23: smoothing condenser

24: current limiting element

25 handle

100: storage board

101a, 101b: common power bus

102: converter section

103: smoothing capacitor

104: slide rail

200: inverter unit

201a, 201b: contactor

202: inverter unit

203: smoothing capacitor

204: current limiting element

205: handle

206: voltage detection circuit

207: initial charging operation circuit

208: initial charging switch

Claims (6)

A semiconductor unit composed of a case housed in a storage panel, First and second contacts connected to a common power busbar on the storage panel side; A smoothing capacitor for smoothing the power source obtained in the first and second contacts; An inverter unit for converting the power smoothed by the smoothing capacitor; A current limiting element for suppressing an inrush current into the smoothing capacitor of the power source obtained in the first or second contact; An opening and closing portion connected in parallel to the current limiting element, A voltage detector detecting a charging voltage of the smoothing capacitor; A control unit which operates the opening / closing unit by the voltage detected by the voltage detecting unit And a semiconductor unit. The method of claim 1, The control unit is characterized in that the switch unit is in the closed state when the voltage detected by the voltage detector is greater than or equal to a preset threshold value, and the switch unit is in the open state when the voltage is less than the threshold value. The method of claim 2, And a hysteresis at the threshold value. A power conversion device comprising a storage panel and a plurality of semiconductor units housed in the storage panel, The storage panel includes two common power buses for supplying power to the semiconductor units, Each semiconductor unit, First and second contacts connected to the two common power buses, A smoothing capacitor for smoothing the power source obtained in the first and second contacts; An inverter unit for converting the power smoothed by the smoothing capacitor; A current limiting element for suppressing an inrush current into the smoothing capacitor of the power source obtained in the first or second contact; An opening and closing portion connected in parallel to the current limiting element, A voltage detector detecting a charging voltage of the smoothing capacitor; A control unit which operates the opening / closing unit by the voltage detected by the voltage detecting unit Power conversion apparatus comprising a. The method of claim 4, wherein The control unit, when the voltage detected by the voltage detection unit is a predetermined threshold value or more, the switching unit is in a closed state, when less than the threshold value, the power conversion device characterized in that the opening state. . The method of claim 5, And a hysteresis in said threshold value.

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