CN201887671U

CN201887671U - Power unit for frequency converter

Info

Publication number: CN201887671U
Application number: CN201020651139XU
Authority: CN
Inventors: 仲华
Original assignee: Sanken Ld Electric (jiangyin) Co Ltd
Current assignee: Sanken Ld Electric (jiangyin) Co Ltd
Priority date: 2010-12-09
Filing date: 2010-12-09
Publication date: 2011-06-29
Anticipated expiration: 2020-12-09

Abstract

The utility model discloses a power unit for a frequency converter, which comprises an electrolytic capacitor group, a heat radiator, an IGBT (insulated gate bipolar transistor), a rectifier bridge, a transformer, a contactor and a PCB (printed circuit board), wherein the input end of the IGBT is connected with the output end of the rectifier bridge; the contactor is connected with the output end of the IGBT; the power unit is divided into a first box body and a second box body; the first box body is provided with the electrolytic capacitor group; the second box body is provided with the heat radiator, the IGBT, the rectifier bridge, the transformer, the contactor and the PCB; a laminated bus bar is arranged between the first box body and the second box body; and the electrolytic capacitor group is connected in parallel between the IGBT and the rectifier bridge through the laminated bus bar. By adopting the power unit of the split frequency converter, which is disclosed by the utility model, the weight of the power unit can be effectively split, and the workload needed during installation and maintenance can be reduced, so the installability and the maintainability of a product are greatly improved.

Description

The power cell that is used for frequency converter

Technical field

The utility model relates to frequency converter, specifically, relates to a kind of power cell that is used for frequency converter.

Background technology

Current, the power grade of frequency converter strides forward to high-power and super high power, but the increase of power grade will inevitably cause the power device that uses and the increase of radiating element weight, when these weight are increased to a certain degree, can influence the transportation, installation, maintenance of whole frequency converter and the convenience and the fail safe of maintenance, also can make the use cost of frequency converter rise to installing and keeping in repair the demand that proposes on more equipment.This lifting to product competitiveness is very disadvantageous.

The power cell that uses on the present frequency converter is an integral body normally, comprising employed whole devices (as: electrochemical capacitor, radiator, insulated gate bipolar transistor IGBT, rectifier bridge, transformer, contactor and pcb boards).Along with the rising of transducer power grade, the overall weight of power cell has also risen to present hundreds of kilogram from early stage tens kilograms.This makes installation and maintenance inconvenience, and may use large-scale hoisting machinery, and this can make the cost of installing increase greatly.So, need a kind of I﹠M convenient at present, can reduce the power cell of installation cost and deal with these demands.

The utility model content

Technical problem to be solved in the utility model is to provide a kind of power cell that is used for frequency converter, convenience when guaranteeing the frequency converter installation and maintenance and fail safe.

A kind of power cell that is used for frequency converter of the present utility model, comprise electrochemical capacitor group, radiator, IGBT, rectifier bridge, transformer, contactor and pcb board, the input of described IGBT links to each other with the output of described rectifier bridge, described contactor is connected the output of described IGBT, described power cell is divided into first, second casing, described first casing is equipped with described electrochemical capacitor group, described second casing is equipped with described radiator, IGBT, rectifier bridge, transformer, contactor and pcb board, be provided with stack bus bar between described first and second casings, described electrochemical capacitor group is connected in parallel between described IGBT and the rectifier bridge by described stack bus bar.

Described stack bus bar comprises two copper bars that are respectively anodal and negative pole.

Be provided with an insulation board between described two copper bars.

Described electrochemical capacitor group comprises the electrochemical capacitor group of a plurality of series connection, and each in the described electrochemical capacitor group comprises the electrochemical capacitor of a plurality of parallel connections.

Also comprise in described first casing with described electrochemical capacitor group of connecting in each grading resistor in parallel.

Described second casing also comprises the absorption electric capacity of the input that is installed in described IGBT.

Described second casing also comprises the fuse that links to each other with the input of described rectifier bridge.

Adopt split type transducer power unit of the present utility model, can split the weight of power cell effectively, required workload when reducing installation and maintenance makes the installability of product, maintainability promote greatly.

Description of drawings

Fig. 1 is the structural representation that is used for the power cell of frequency converter of the present utility model, and wherein Fig. 1 a-Fig. 1 c shows vertical view, front view, the right view of this power cell respectively.

Fig. 2 is the connection diagram between two casings of the utility model power cell.

Fig. 3 is the structural representation of the electrochemical capacitor case of the utility model power cell.

Fig. 4 is the structural representation of the power cell main body of the utility model power cell.

Fig. 5 is the circuit theory diagrams of the utility model power cell.

Embodiment

Fig. 1 shows the structural representation that is used for the power cell of frequency converter of the present utility model.

Fig. 2 shows the connection diagram between two casings of the utility model transducer power unit, and wherein: casing 1 is the power cell main body that devices such as radiator, IGBT, rectifier bridge, transformer, contactor and pcb board are installed.2 of casings are the electrochemical capacitor casees that electrochemical capacitor is installed.Be connected with 5 by copper bar 3 between the

casing

1 and 2,

copper bar

3 and 5 one is that positive pole, is negative pole.Isolate with insulation board 4 between the

copper bar

3 and 5 in order to avoid short circuit,

copper bar

3 and 5 also has insulation board 4 to form the structure of a lamination copper bar.Also have an insulation board 6 to guarantee to insulate between copper bar 3 and the electrochemical capacitor case 2 in the inboard of copper bar 3.

Copper bar

3 and 5 with

casing

1 and 2 between be connected by cross coiled hair screw assemblies 7.

Fig. 3 shows the structural representation of the electrochemical capacitor case 2 of the utility model transducer power unit.The basis that electrochemical capacitor case 2 is installed is an electrochemical capacitor case base 8.Lay a plurality of electrochemical capacitors 9 therein, electric capacity quantity is by capacity (power) decision of power cell, lay 15 electrochemical capacitors 9 in the present embodiment, be connected with 15 with

copper bar

10,11 between the electrochemical capacitor 9, constitute three strings five structure (promptly dividing five groups of parallel connections, every group of three series connection) also between the electrochemical capacitor.The arrangement mode of electrochemical capacitor is branch three rows, five of every rows, and the positive pole of five electric capacity of every row is connected with anodal, and negative pole is connected with negative pole, and last row's positive pole links to each other with back one row's negative pole.Foremost one row's negative pole and last row's positive pole link to each other with 5 with copper bar 3.Use

insulation board

12 and 13 to isolate between the

copper bar

10,11 and 15, copper bar 11 with 15 with Fig. 2 in copper bar 3 be connected with 5, wherein copper bar 11 is connected with copper bar 3, copper bar 15 is connected with copper bar 5, it is fastening to pass through screw between them.Also can comprise grading resistor 14 in this electrochemical capacitor case, be used for voltage between each electrochemical capacitor of balance, grading resistor 14 has three in the present embodiment, and each level of series connection needs resistance (the shared grading resistor 14 of the electric capacity of per five parallel connections).Cover tight this electrochemical capacitor case 2 with top board 16 at last.

The structural representation of the power cell main body 1 of the split type transducer power unit of the utility model has been shown among Fig. 4.The basis that power cell main body 1 is installed is a base 17.Portion installs radiator 18 and works the fuse 19 of importing overcurrent protection within it.A plurality of rectifier bridges 20 and IGBT 21 are installed on radiator 18.Interconnect with

copper bar

22 and 23 between the rectifier bridge 20, and be connected with 26 with copper bar 24 between rectifier bridge 20 and the IGBT 21, isolate with insulation board 25 between them, and copper bar 24 with 26 with Fig. 2 in copper bar 3 be connected with 5.Input on IGBT 21 need be installed and absorb electric capacity 27, is used to absorb IGBT and opens and turn-off peak voltage constantly.

Copper bar

28 and 29 is output copper bars of IGBT 21, and by the output of copper bar 31 as power cell, insulation column 30 is used for supporting copper bar 31.Support 32 is supporting PCB mounting panel 33, pcb board 35 is installed on the mounting panel 33, and middle with insulation board 34 isolation, pcb board 35 is used to IGBT 21 modules of H bridge that drive signal is provided, uploading unit information such as bypass, direct voltage etc. are carried out the instruction of main control part.Transformer 37 is installed on the rear board of base 17, and transformer 37 provides the control power supply, provides power supply for the power module of pcb board 35 for bypass contactor.Last top board 36 is used for covering the casing of tight power cell main body.And contactor 38 is installed in the outside of base 17 rear boards, is connected with 29 with IGBT output copper bar 28 by copper bar 39.In all copper bars,

copper bar

3,5,11,15,24 and 26 all was galvanic, so must adopt the structure of lamination, all copper bars and components and parts all adopt screw to be fastenedly connected.

Fig. 5 shows the basic circuit schematic diagram of this power cell, each element among Fig. 5 among each element and Fig. 3-4 is corresponding one by one respectively: fuse 19 is represented with F1-F3, rectifier bridge 20 is represented with DD1-DD3, electrochemical capacitor 9 is represented with capacitor C 1A-C1E, C2A-C2E, C3A-C3E, grading resistor 14 is represented with resistance R 1-R3, absorbs electric capacity 27 and represents with capacitor C 4, C5.

The operation principle of the utility model power cell is as follows: at first; the 690V three-phase alternating-current supply is by fuse 19 input power unit; here fuse 19 has been input overcurrent protections; then the electric current by 20 pairs of inputs of rectifier bridge carries out rectification; make the 690V alternating current be converted to the direct current about 975V; by the direct current input IGBT 21 of

copper bar

24 and 20 outputs of 26 rectifier bridges,, be converted to single-phase alternating current output then at last by the inversion of IGBT 21.And between

copper bar

24 and 26 connection rectifier bridges 20 and IGBT 21, also want electrochemical capacitor 9 in the parallel connection, these electrochemical capacitors have guaranteed the stable of direct voltage on the

DC master row

24 and 26, and the power supply of short time also can be provided for load under the situation that runs into the frequency converter instant power-down.

In sum, adopt the utility model transducer power unit, change integral structure in the past, by splitting the weight of power cell effectively, required workload when reducing installation and maintenance.

The description of above embodiment mainly is for basic principle of the present utility model and principal character are described.The utility model is not limited to the description scope of the foregoing description, in the scope of the utility model appended claims, can make variously replenish, change and replacing.

Claims

1. power cell that is used for frequency converter, comprise electrochemical capacitor group, radiator, IGBT, rectifier bridge, transformer, contactor and pcb board, the input of described IGBT links to each other with the output of described rectifier bridge, described contactor is connected the output of described IGBT, it is characterized in that, described power cell is divided into first, second casing, described first casing is equipped with described electrochemical capacitor group, described second casing is equipped with described radiator, IGBT, rectifier bridge, transformer, contactor and pcb board, be provided with stack bus bar between described first and second casings, described electrochemical capacitor group is connected in parallel between described IGBT and the rectifier bridge by described stack bus bar.

2. power cell as claimed in claim 1 is characterized in that, described stack bus bar comprises two copper bars that are respectively anodal and negative pole.

3. power cell as claimed in claim 2 is characterized in that, is provided with an insulation board between described two copper bars.

4. power cell as claimed in claim 3 is characterized in that, described electrochemical capacitor group comprises the electrochemical capacitor group of a plurality of series connection, and each in the described electrochemical capacitor group comprises the electrochemical capacitor of a plurality of parallel connections.

5. power cell as claimed in claim 4 is characterized in that, also comprise in described first casing with described electrochemical capacitor group of connecting in each grading resistor in parallel.

6. power cell as claimed in claim 1 is characterized in that, described second casing also comprises the absorption electric capacity of the input that is installed in described IGBT.

7. power cell as claimed in claim 1 is characterized in that, described second casing also comprises the fuse that links to each other with the input of described rectifier bridge.