CN101741270B

CN101741270B - Semiconductor unit and power conversion device

Info

Publication number: CN101741270B
Application number: CN200910224537.5A
Authority: CN
Inventors: 松本洋平; 执行正谦; 金泽胜昭
Original assignee: Hitachi Ltd
Current assignee: Hitachi Ltd
Priority date: 2008-11-26
Filing date: 2009-11-17
Publication date: 2014-06-11
Anticipated expiration: 2029-11-17
Also published as: KR20100059715A; CN101741270A; JP2010130766A

Abstract

The present invention provides a semiconductor unit and a power conversion device. An inverter unit (200) comprises the following components: contacts (201a, 201b) which can be connected and separated from common power buses (101a,101b), a smoothing capacitor (203) which performs smoothing for the power obtained from the contacts (201a,201b), an inverter part (202) which inverts the power which is executed with smoothing by the smoothing capacitor (203), a current limiting component (204) which restrains the inrush current of the power from the contacts (201a,201b) to the smoothing capacitor (203), an initial charging switch (208) which is connected with the current limiting component (204) in parallel, a voltage detection circuit (206) which detects the charging current of the capacitor (203), and an initial charging switch operation circuit (207) for operating the initial charging current (208) according to the voltage detected by the voltage detection circuit (206). Therefore, in the operation of a plurality of inverter units, a random inverter can be processed with the insertion of one stage when inserted after drawing out.

Description

Semiconductor unit and power inverter

Technical field

The present invention relates to a kind of power inverter that is accommodated in the semiconductor unit of storage tray and is formed by this semiconductor unit and storage tray, particularly relate to a kind of semiconductor unit and power inverter of being carried out warm swap by semiconductor unit under the state of storage tray supply power from storage tray of being useful in.

Background technology

General, as by being accommodated in the semiconductor unit of storage tray and the semi-conductor electricity power conversion device that this storage tray forms, the inverter portion in received unit carries out DC power supply to be converted to the electric power conversion of AC power, and supplies with to necessary equipment.Supply with by connecting public power bus and contact for the electric power of changing.In addition, in this device, for electric power conversion, need smoothing from the electric power of AC power, therefore be provided with smmothing capacitor.

On the other hand, smmothing capacitor needs initial charge circuit.In initial charge, be provided with in order to prevent initial excessive voltage the circuit that current limiting element is used, for example, in the technology of recording in Beneficial 6-74092 communique, the circuit of using as current limiting element, different from normal operation, be provided with contact and public power bus that current limiting element is used.

Thus, in the prior art, because initial charge need to be provided as contact and the public power bus of the circuit that current limiting element uses, therefore weight increases, arranges area change.In addition, expect the increase that can cause cost due to the increase of mechanical structure portion.

And then, in maintenance, can lose time, and the in the situation that of current limiting element performance function not yet in effect, even can destroy the possibility of smmothing capacitor.

Summary of the invention

In view of the above problems, the object of the present invention is to provide a kind of semiconductor unit and power inverter that is applicable to circuit simplification and a succession of operation of energy automation.

In order to reach above-mentioned purpose, in semiconductor unit except possessing: the contact that can be connected with public power bus separation, the power supply being obtained by contact is carried out to the smmothing capacitor of smoothing, beyond the inverter portion being changed by the power supply after smmothing capacitor smoothing, also have: the switch portion of initial charge switch being connected in parallel with current limiting element etc., the voltage detection department of the charging voltage of Detection capacitance device, with the control part of initial charge switching manipulation circuit etc. of opening/closing portion that operates initial charge switch according to the voltage that detected by voltage detecting circuit.

By doing like this, specifically, initial charge switch be by voltage detecting circuit to the voltage that causes the both end voltage of the smmothing capacitor of variation because of the plug of semiconductor unit and detect taking a certain threshold value as boundary, use switching manipulation circuit to carry out open and close controlling by initial charge.Therefore, initial charge with switch in the case of detecting than being closed circuit the high voltage of a certain threshold value, in the case of detecting than being open circuit the low voltage of a certain threshold value.Wherein, the inrush current that threshold value now enters to produce as the signature because of semiconductor unit can not destroyed the value of smmothing capacitor.

By the present invention, can under electriferous state, install simple and reliablely, can a succession of action of automation.More particularly, by the initial charge switch that carries out switch according to the both end voltage of smmothing capacitor is set, and controlled the connection of current limiting element with switch by this initial charge, thereby in the time carrying out fitting operation, do not need two stage operation, can under electriferous state, install, in addition, be not to rely on artificial operation but can automation carry out a succession of action from initial state of charge to "on" position simple and reliablely.

In addition, for the shape of device, without the bus or the contact that use in the time connecting the initial stage, just because of this, can make equipment miniaturization and form at low cost.Thus, can realize cost degradation, maintenance summary, shorten maintenance time.

Brief description of the drawings

Fig. 1 is the stereogram that represents the power inverter of the example that relates to an embodiment of the invention.

The semiconductor inverter unit that Fig. 2 relates to embodiment of the present invention is retracted to the structure chart of off position.

Fig. 3 is that explanation relates to the initial state of charge of inverter unit of embodiment of the present invention and the structure chart of the current circuit of operating condition.

Fig. 4 is the stereogram that represents an example of the power inverter of reference example.

Fig. 5 is the structure chart of the inverter unit of the power inverter of Fig. 4 example.

Fig. 6 is the key diagram of the action of the power inverter of presentation graphs 4 examples.

In figure: 10-storage tray, 11a, 11b, 11c-public power bus, 12-transducer portion, 13-smmothing capacitor, 14-handle, 20-inverter unit, 21a, 21b, 21c-contact, 22-inverter portion, 23-smmothing capacitor, 24-current limiting element, 25-handle, 100-storage tray, 101a, 101b-public power bus, 102-transducer portion, 103-smmothing capacitor, 104-slide rail, 200-inverter unit, 201a, 201b-contact, 202-inverter portion, 203-smmothing capacitor, 204-current limiting element, 205-handle, 206-voltage detecting circuit, 207-initial charge function circuit, 208-initial charge switch.

Embodiment

Below, with reference to accompanying drawing, the example of an embodiment of the invention is described.For ease of understanding, first, enumerate the reference example of Fig. 1～3, then, limit clearly states basic viewpoint with reference to reference example limit.

As by being accommodated in the semiconductor unit of storage tray and the semi-conductor electricity power conversion device that this storage tray forms, the structure shown in Fig. 4 is disclosed as a reference example.Structure shown in this Fig. 4 is to make multiple inverter units be accommodated in storage tray the inverter portion in received each inverter unit to carry out DC power supply be converted to the electric power conversion of AC power and supply with to necessary equipment.Structure at the example of this Fig. 4 is under the state of supply power, directly to carry out the plug of inverter unit from storage tray.In order to plug under the state supplying with this power supply, in inverter unit, need the initial charge circuit of smmothing capacitor.

Structure to Fig. 4 describes, the 10th, storage tray, in this storage tray 10 via slide rail with freely extract out or give as security into mode be accommodated with many inverter units 20.In the example of Fig. 4, longitudinally there are side by side 6 inverter units.Be provided with

public power bus

11a, 11b and the special public power bus 11c of initial charge that main circuit is used in the inside of storage tray 10.The public power bus 11a, the 11b that use to main circuit via not shown power-supply system supply with DC power supply.

At this, the special public power bus 11c of

public power bus

11a, 11b and initial charge from directly over plane configure as shown in Figure 5 while overlooking.That is, only backway L of the relative public power bus of public power bus 11b 11a, the special public power bus 11c of initial charge is on the position identical with public power bus 11a.And then, be connected taking the special public power bus 11c of initial charge and public power bus 11b as the mode of homopolarity.

The structure of the inverter unit 20 in Fig. 4 is the structures shown in Fig. 5., inverter unit 20 possess can be connected with

public power bus

11a, 11b, 11c, contact 21a, the 21b of separation, 21c.The power supply being obtained by

contact

21a, 21b carries out smoothing in smmothing capacitor 23.Supplied with to possessing the inverter portion 22 of semiconductor circuit and being converted to the AC power of regulation by the power supply after these smmothing capacitor 23 smoothings.In addition, possesses the current limiting element 24 that the power supply to being obtained by contact 21c suppresses to the inrush current of smmothing capacitor 23.Further, although not shown, the load-side of inverter portion 22 is connected with the portion of terminal that is arranged on storage tray 10 via contact type connecting portion, when being in prison into or extracting inverter unit out, automatically connects or opens circuit.

Action while the inverter unit 20 that makes to form being thus accommodated in to storage tray 10 with reference to accompanying drawing 6 describes.

First, as shown in Fig. 6 (a), have to the outstanding handle 25 in outside of the face side of inverter unit 20, along the slide rail in storage tray 10 give as security into.If give as security like this into, as shown in Fig. 6 (b), inverter unit 20 arrives initial charge position, public power bus 11a is connected with contact 21a, the special public power bus 11c of initial charge is connected with contact 21c, via current limiting element 24, the smmothing capacitor 23 of inverter unit 20 is charged.And, if inverter unit 20 given as security into,, as shown in Fig. 6 (c), public power bus 11b is connected with contact 21b, finish give as security into.Give as security under the state of end at this, become via contact 21b from public power bus 11b directly to the state of inverter portion 22 supply powers.In inverter portion 22, carry out the processing that supplied with DC power supply is converted to AC power, supply with the AC power after conversion to not shown load.

This semi-conductor electricity power conversion device is in the time installing to storage tray 10, and as shown in Fig. 6 (b), initial

public power bus

11a, 11c contact with

contact

21a, 21c, and then public power bus 11b contacts with contact 21b.Thus, as the charging current that flows to smmothing capacitor 23, supply with the state being limited by current limiting element 24 at first.Thereafter, under complete installment state, do not carry out supply power via current limiting element 24, while running in inverter portion 22, the restriction of current limiting element 24 is inoperative.

According to the power inverter of inverter unit 20 that has possessed structure shown in this Fig. 4～Fig. 6, in the time installing to storage tray 10, electric current mobile in smmothing capacitor 23 has been limited, and also can not destroy smmothing capacitor 23 even if carry out warm swap.

In the inverter unit 20 forming thus, because external circuit that initial charge uses, i.e. contact 21c, public power bus 11c need to be set, so profile and the weight of the storage tray 10 of inverter unit 20 and this inverter unit 20 of storage increase, the area that arranges of storage tray also increases.In addition, make mechanical structure portion increase in order to position, this can cause cost to increase.

And, for inverter unit 20 is moved on off position, initial charge position and running position because need to insert inverter unit 20 by manpower, therefore maintenance on spended time.In addition, once just in case be not parked in the state shown in Fig. 6 (b) in the time that inverter unit 20 inserts, and be inserted in the situation of the state as shown in Fig. 6 (c), exist current limiting element 24 effectively not play a role and inherent possibility that smmothing capacitor 23 can destroy. quickly

In view of the above problems, in order to realize the simplification of the external circuit that initial charge uses and can automation to mix a succession of operation under the operating condition of manpower, below go on to say.

Fig. 1 represents the overall structure of the semi-conductor electricity power conversion device of an example of present embodiment.In Fig. 1, forming in the storage tray 100 of semi-conductor electricity power conversion device, equally spaced configure 6 grades of inverter units 200, can extract out freely front and back.And, between inverter unit rear side and storage tray, longitudinally dispose side by side 2 public power bus 101a, 101b.Supply with DC power supply to 2

public power bus

101a, 101b.

Storage tray 100 is configured at the two sides of the top board of configured in parallel and base plate side assembled side panel and with backboard and blocks the back side, and its face side is opened to outside.And the inner space of the storage tray 100 separating with top board, base plate, side plate and backplate forms receiving room.

Each inverter unit 200 of 6 grades of configurations is all identical structure, is configured to the framework of same shape.

Be provided with

contact

201a, 201b at the back side of inverter unit 200.Contact 201a, 201b are the electric contacts for being connected with public power bus 101a, 101b.Dispose slide rail 104 at the two ends of the Width of inverter unit 200.By the receiving room storage inverter unit 200 along this slide rail 104 to storage tray 100, thereby contact 201a, 201b are connected with

public power bus

101a, 101b.

Fig. 2 is the internal structure that represents the inverter unit 200 of watching from top.

In the example of present embodiment, inverter unit 200 possesses: can be connected with

public power bus

101a, 101b, contact 201a, the 201b of separation and the smmothing capacitor 203 that the power supply being obtained by

contact

201a, 201b is carried out to smoothing.And, also possess the inverter portion 202 to being changed by the power supply after smmothing capacitor 203 smoothings.

In addition, also possess: the current limiting element 204 that the power supply being obtained by

contact

201a, 201b is suppressed to the inrush current of smmothing capacitor 203 and the switch 208 for initial charge being connected in parallel with this current limiting element 204, wherein, parallel circuits is connected between contact 201b and one end of smmothing capacitor 203.

The charging voltage of smmothing capacitor 203 is detected by voltage detecting circuit 206.The voltage being detected by this voltage detecting circuit 206 is judged and is operated according to the magnitude of voltage of judging the switching of (control) initial charge switch 208 by initial charge switching manipulation circuit 207.

Open and close controlling as initial charge with switch 208, by voltage detecting circuit 206 to the voltage that causes the both end voltage of the smmothing capacitor 203 of variation because of the plug of inverter unit 200 and detect taking a certain threshold value as boundary, use switching manipulation circuit 207 to carry out the open and close controlling of initial charge switch 208 by initial charge.Therefore, initial charge with switch 208 in the case of detecting than closing control the high voltage of a certain threshold value, in the case of detecting than opening control the low voltage of a certain threshold value.

Conventionally, in

public power bus

101a, 101b, be connected with and the DC terminal of the transducer portion 102 of inverter unit 200 same structures, control as remaining on certain direct voltage (hundreds of～thousands of V).Thus, under off state, contact 201a, 201b and

public power bus

101a, 101b need to guarantee sufficient insulation distance.

Under off state, become inverter unit 200 between

contact

201a, 201b and

public power bus

101a, 101b and be parked on the position of fully having guaranteed insulation distance, and the cold state of inverter unit 200.

Then, with reference to Fig. 3, the action when the inverter unit of the example of present embodiment 200 is installed on to storage tray 100 describes.

Have to the outstanding handle 205 in outside of the face side of inverter unit 200, it is moved along slide rail 104, make inverter unit 200 be accommodated in the receiving room of storage tray 100.By such storage, as shown in Fig. 3 (a),

public power bus

101a, 101b are connected with contact 201a, 201b.Now, because smmothing capacitor 203 is not charged, therefore the both end voltage of smmothing capacitor 203 detects very low voltage by voltage detecting electric current 206, by initial charge switching manipulation circuit 207, initial charge is open circuit with switch 208, have current flowing via the current limiting element 204 being connected on contact 201b to smmothing capacitor 203, thereby smmothing capacitor 203 is charged.Along with smmothing capacitor 203 charges, the both end voltage of smmothing capacitor 203 rises.This voltage detects by voltage detecting circuit 206, having arrived a certain threshold value when above, initial charge is used switching manipulation circuit 207 and is automatically closed circuit by initial charge with switch 208, as shown in Fig. 3 (b), electric current flows to smmothing capacitor 203 with switch 208 via initial charge.

In the time inserting inverter unit 200, have owing to flowing in smmothing capacitor 203 and the inrush current of the proportional amplitude of difference of the both end voltage of the voltage applying on

public power bus

101a, 101b and smmothing capacitor 203, so need to select can not destroy the threshold value of smmothing capacitor 203.By allowing this threshold value with hysteresis, thereby can prevent the initial charge vibration (chattering) of switch 208.

In addition, in the time of initial charge, current limiting element 204, with the time constant of the electric capacity derivation of the resistance value by current limiting element 204 and smmothing capacitor 203, only has the current flowing of pulse type in the short time.And, because energising number of times is identical with the plug number of times of inverter unit 200, so only cold start (cold start) in the time of maintenance of energising.

For this reason, compared with the resistance using under the condition of streaming current all the time with common hundreds of～thousands of V, the resistance that resistance value is little can be used, the effect in the charging interval that shortens smmothing capacitor 203 can be obtained.

And, the initial charge switch 208 opening and closing according to the both end voltage of smmothing capacitor 203 connection of controlling current limiting element 204 with this initial charge switch 208 be set by being configured to inverter unit 200 is interior, thereby in the time that inverter unit 200 is inserted to storage tray 100, do not need the update of two-stage as reference example, can obtain installing under electriferous state simple and reliablely yet and be not to rely on the operation of manpower but the effect of a succession of action from initial state of charge to "on" position is carried out in automation.

In addition, for the shape of device, without the bus or the contact that use, just because of this, can carry out constituent apparatus with miniaturization and low cost in the time connecting the initial stage.Therefore,, with reference example comparison, also can obtain the effect of the summary of cost degradation, maintenance.

Further, in the example of above-mentioned execution mode, although describe with the example that uses the electric conductor that has cuboid as public power bus, if can guarantee that electrical current capacity can be also the connector of tape cable.Now, by using can the be improved effect of the link position degree of freedom of connector.

In addition, in the above-described embodiment, although the inverter unit that is applicable to possess inverter portion as semi-conductor electricity power conversion device is by the structure of warm swap, if the semiconductor unit of same energy warm swap, the also structure beyond applicable inverter.And the outer shape shown in Fig. 1 etc. is an example, the present invention is not limited to diagram.

Claims

1. a semiconductor unit, comprises the framework that is accommodated in storage tray, and this framework has structure that can be along the slide rail that is disposed at storage tray from nearby rearward sliding,

This semiconductor unit, possesses:

First and second contact, it is disposed at the face of the rear side of described framework, is connected with the public power bus at the rear that is disposed at described storage tray side;

Smmothing capacitor, it carries out smoothing to the power supply obtaining at described first and second contact;

Inverter portion, it is to being changed by the power supply after described smmothing capacitor smoothing;

Current limiting element, it suppresses to the inrush current of described smmothing capacitor the power supply obtaining at the described first or second contact;

Opening/closing portion, itself and described current limiting element are connected in parallel;

Voltage detection department, it detects the charging voltage of described smmothing capacitor; With

Control part, it operates described opening/closing portion according to the voltage being detected by described voltage detection department,

The voltage that described control part detects at described voltage detection department is to make described opening/closing portion for closing state more than predefined threshold value, makes described opening/closing portion for opening state in the situation that being less than described threshold value,

Allow described threshold value with hysteresis,

In the time making described framework make described first and second contact be connected with the described public power bus of electriferous state from nearby rearward sliding along the slide rail of described storage tray, described opening/closing portion is for opening state, thereby described current limiting element suppresses the inrush current to described smmothing capacitor.

2. a power inverter, it is made up of storage tray and the multiple semiconductor units that are accommodated in this storage tray,

Described storage tray possesses two public power buses to each described semiconductor unit supply power,

Each described semiconductor unit comprises the framework that is accommodated in storage tray, and this framework has structure that can be along the slide rail that is disposed at storage tray from nearby rearward sliding,

Each described semiconductor unit possesses:

First and second contact, it is disposed at the face of the rear side of described framework, is connected with described two public power buses at the rear that is disposed at described storage tray side;

Allow described threshold value with hysteresis,